S: Supported
F: arch/tile/
F: drivers/tty/hvc/hvc_tile.c
-F: drivers/net/tile/
+F: drivers/net/ethernet/tile/
F: drivers/edac/tile_edac.c
TLAN NETWORK DRIVER
source "drivers/net/caif/Kconfig"
-config TILE_NET
- tristate "Tilera GBE/XGBE network driver support"
- depends on TILE
- default y
- select CRC32
- help
- This is a standard Linux network device driver for the
- on-chip Tilera Gigabit Ethernet and XAUI interfaces.
-
- To compile this driver as a module, choose M here: the module
- will be called tile_net.
-
config XEN_NETDEV_FRONTEND
tristate "Xen network device frontend driver"
depends on XEN
obj-$(CONFIG_WIMAX) += wimax/
obj-$(CONFIG_CAIF) += caif/
-
-obj-$(CONFIG_TILE_NET) += tile/
source "drivers/net/ethernet/sun/Kconfig"
source "drivers/net/ethernet/tehuti/Kconfig"
source "drivers/net/ethernet/ti/Kconfig"
+source "drivers/net/ethernet/tile/Kconfig"
source "drivers/net/ethernet/toshiba/Kconfig"
source "drivers/net/ethernet/tundra/Kconfig"
source "drivers/net/ethernet/via/Kconfig"
obj-$(CONFIG_NET_VENDOR_SUN) += sun/
obj-$(CONFIG_NET_VENDOR_TEHUTI) += tehuti/
obj-$(CONFIG_NET_VENDOR_TI) += ti/
+obj-$(CONFIG_TILE_NET) += tile/
obj-$(CONFIG_NET_VENDOR_TOSHIBA) += toshiba/
obj-$(CONFIG_NET_VENDOR_TUNDRA) += tundra/
obj-$(CONFIG_NET_VENDOR_VIA) += via/
--- /dev/null
+#
+# Tilera network device configuration
+#
+
+config TILE_NET
+ tristate "Tilera GBE/XGBE network driver support"
+ depends on TILE
+ default y
+ select CRC32
+ ---help---
+ This is a standard Linux network device driver for the
+ on-chip Tilera Gigabit Ethernet and XAUI interfaces.
+
+ To compile this driver as a module, choose M here: the module
+ will be called tile_net.
--- /dev/null
+#
+# Makefile for the TILE on-chip networking support.
+#
+
+obj-$(CONFIG_TILE_NET) += tile_net.o
+ifdef CONFIG_TILEGX
+tile_net-objs := tilegx.o mpipe.o iorpc_mpipe.o dma_queue.o
+else
+tile_net-objs := tilepro.o
+endif
--- /dev/null
+/*
+ * Copyright 2011 Tilera Corporation. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/sched.h>
+#include <linux/kernel.h> /* printk() */
+#include <linux/slab.h> /* kmalloc() */
+#include <linux/errno.h> /* error codes */
+#include <linux/types.h> /* size_t */
+#include <linux/interrupt.h>
+#include <linux/in.h>
+#include <linux/netdevice.h> /* struct device, and other headers */
+#include <linux/etherdevice.h> /* eth_type_trans */
+#include <linux/skbuff.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/hugetlb.h>
+#include <linux/in6.h>
+#include <linux/timer.h>
+#include <linux/io.h>
+#include <asm/checksum.h>
+#include <asm/homecache.h>
+
+#include <hv/drv_xgbe_intf.h>
+#include <hv/drv_xgbe_impl.h>
+#include <hv/hypervisor.h>
+#include <hv/netio_intf.h>
+
+/* For TSO */
+#include <linux/ip.h>
+#include <linux/tcp.h>
+
+
+/*
+ * First, "tile_net_init_module()" initializes all four "devices" which
+ * can be used by linux.
+ *
+ * Then, "ifconfig DEVICE up" calls "tile_net_open()", which analyzes
+ * the network cpus, then uses "tile_net_open_aux()" to initialize
+ * LIPP/LEPP, and then uses "tile_net_open_inner()" to register all
+ * the tiles, provide buffers to LIPP, allow ingress to start, and
+ * turn on hypervisor interrupt handling (and NAPI) on all tiles.
+ *
+ * If registration fails due to the link being down, then "retry_work"
+ * is used to keep calling "tile_net_open_inner()" until it succeeds.
+ *
+ * If "ifconfig DEVICE down" is called, it uses "tile_net_stop()" to
+ * stop egress, drain the LIPP buffers, unregister all the tiles, stop
+ * LIPP/LEPP, and wipe the LEPP queue.
+ *
+ * We start out with the ingress interrupt enabled on each CPU. When
+ * this interrupt fires, we disable it, and call "napi_schedule()".
+ * This will cause "tile_net_poll()" to be called, which will pull
+ * packets from the netio queue, filtering them out, or passing them
+ * to "netif_receive_skb()". If our budget is exhausted, we will
+ * return, knowing we will be called again later. Otherwise, we
+ * reenable the ingress interrupt, and call "napi_complete()".
+ *
+ * HACK: Since disabling the ingress interrupt is not reliable, we
+ * ignore the interrupt if the global "active" flag is false.
+ *
+ *
+ * NOTE: The use of "native_driver" ensures that EPP exists, and that
+ * we are using "LIPP" and "LEPP".
+ *
+ * NOTE: Failing to free completions for an arbitrarily long time
+ * (which is defined to be illegal) does in fact cause bizarre
+ * problems. The "egress_timer" helps prevent this from happening.
+ */
+
+
+/* HACK: Allow use of "jumbo" packets. */
+/* This should be 1500 if "jumbo" is not set in LIPP. */
+/* This should be at most 10226 (10240 - 14) if "jumbo" is set in LIPP. */
+/* ISSUE: This has not been thoroughly tested (except at 1500). */
+#define TILE_NET_MTU 1500
+
+/* HACK: Define to support GSO. */
+/* ISSUE: This may actually hurt performance of the TCP blaster. */
+/* #define TILE_NET_GSO */
+
+/* Define this to collapse "duplicate" acks. */
+/* #define IGNORE_DUP_ACKS */
+
+/* HACK: Define this to verify incoming packets. */
+/* #define TILE_NET_VERIFY_INGRESS */
+
+/* Use 3000 to enable the Linux Traffic Control (QoS) layer, else 0. */
+#define TILE_NET_TX_QUEUE_LEN 0
+
+/* Define to dump packets (prints out the whole packet on tx and rx). */
+/* #define TILE_NET_DUMP_PACKETS */
+
+/* Define to enable debug spew (all PDEBUG's are enabled). */
+/* #define TILE_NET_DEBUG */
+
+
+/* Define to activate paranoia checks. */
+/* #define TILE_NET_PARANOIA */
+
+/* Default transmit lockup timeout period, in jiffies. */
+#define TILE_NET_TIMEOUT (5 * HZ)
+
+/* Default retry interval for bringing up the NetIO interface, in jiffies. */
+#define TILE_NET_RETRY_INTERVAL (5 * HZ)
+
+/* Number of ports (xgbe0, xgbe1, gbe0, gbe1). */
+#define TILE_NET_DEVS 4
+
+
+
+/* Paranoia. */
+#if NET_IP_ALIGN != LIPP_PACKET_PADDING
+#error "NET_IP_ALIGN must match LIPP_PACKET_PADDING."
+#endif
+
+
+/* Debug print. */
+#ifdef TILE_NET_DEBUG
+#define PDEBUG(fmt, args...) net_printk(fmt, ## args)
+#else
+#define PDEBUG(fmt, args...)
+#endif
+
+
+MODULE_AUTHOR("Tilera");
+MODULE_LICENSE("GPL");
+
+
+/*
+ * Queue of incoming packets for a specific cpu and device.
+ *
+ * Includes a pointer to the "system" data, and the actual "user" data.
+ */
+struct tile_netio_queue {
+ netio_queue_impl_t *__system_part;
+ netio_queue_user_impl_t __user_part;
+
+};
+
+
+/*
+ * Statistics counters for a specific cpu and device.
+ */
+struct tile_net_stats_t {
+ u32 rx_packets;
+ u32 rx_bytes;
+ u32 tx_packets;
+ u32 tx_bytes;
+};
+
+
+/*
+ * Info for a specific cpu and device.
+ *
+ * ISSUE: There is a "dev" pointer in "napi" as well.
+ */
+struct tile_net_cpu {
+ /* The NAPI struct. */
+ struct napi_struct napi;
+ /* Packet queue. */
+ struct tile_netio_queue queue;
+ /* Statistics. */
+ struct tile_net_stats_t stats;
+ /* True iff NAPI is enabled. */
+ bool napi_enabled;
+ /* True if this tile has succcessfully registered with the IPP. */
+ bool registered;
+ /* True if the link was down last time we tried to register. */
+ bool link_down;
+ /* True if "egress_timer" is scheduled. */
+ bool egress_timer_scheduled;
+ /* Number of small sk_buffs which must still be provided. */
+ unsigned int num_needed_small_buffers;
+ /* Number of large sk_buffs which must still be provided. */
+ unsigned int num_needed_large_buffers;
+ /* A timer for handling egress completions. */
+ struct timer_list egress_timer;
+};
+
+
+/*
+ * Info for a specific device.
+ */
+struct tile_net_priv {
+ /* Our network device. */
+ struct net_device *dev;
+ /* Pages making up the egress queue. */
+ struct page *eq_pages;
+ /* Address of the actual egress queue. */
+ lepp_queue_t *eq;
+ /* Protects "eq". */
+ spinlock_t eq_lock;
+ /* The hypervisor handle for this interface. */
+ int hv_devhdl;
+ /* The intr bit mask that IDs this device. */
+ u32 intr_id;
+ /* True iff "tile_net_open_aux()" has succeeded. */
+ bool partly_opened;
+ /* True iff the device is "active". */
+ bool active;
+ /* Effective network cpus. */
+ struct cpumask network_cpus_map;
+ /* Number of network cpus. */
+ int network_cpus_count;
+ /* Credits per network cpu. */
+ int network_cpus_credits;
+ /* Network stats. */
+ struct net_device_stats stats;
+ /* For NetIO bringup retries. */
+ struct delayed_work retry_work;
+ /* Quick access to per cpu data. */
+ struct tile_net_cpu *cpu[NR_CPUS];
+};
+
+/* Log2 of the number of small pages needed for the egress queue. */
+#define EQ_ORDER get_order(sizeof(lepp_queue_t))
+/* Size of the egress queue's pages. */
+#define EQ_SIZE (1 << (PAGE_SHIFT + EQ_ORDER))
+
+/*
+ * The actual devices (xgbe0, xgbe1, gbe0, gbe1).
+ */
+static struct net_device *tile_net_devs[TILE_NET_DEVS];
+
+/*
+ * The "tile_net_cpu" structures for each device.
+ */
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe0);
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe1);
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe0);
+static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe1);
+
+
+/*
+ * True if "network_cpus" was specified.
+ */
+static bool network_cpus_used;
+
+/*
+ * The actual cpus in "network_cpus".
+ */
+static struct cpumask network_cpus_map;
+
+
+
+#ifdef TILE_NET_DEBUG
+/*
+ * printk with extra stuff.
+ *
+ * We print the CPU we're running in brackets.
+ */
+static void net_printk(char *fmt, ...)
+{
+ int i;
+ int len;
+ va_list args;
+ static char buf[256];
+
+ len = sprintf(buf, "tile_net[%2.2d]: ", smp_processor_id());
+ va_start(args, fmt);
+ i = vscnprintf(buf + len, sizeof(buf) - len - 1, fmt, args);
+ va_end(args);
+ buf[255] = '\0';
+ pr_notice(buf);
+}
+#endif
+
+
+#ifdef TILE_NET_DUMP_PACKETS
+/*
+ * Dump a packet.
+ */
+static void dump_packet(unsigned char *data, unsigned long length, char *s)
+{
+ int my_cpu = smp_processor_id();
+
+ unsigned long i;
+ char buf[128];
+
+ static unsigned int count;
+
+ pr_info("dump_packet(data %p, length 0x%lx s %s count 0x%x)\n",
+ data, length, s, count++);
+
+ pr_info("\n");
+
+ for (i = 0; i < length; i++) {
+ if ((i & 0xf) == 0)
+ sprintf(buf, "[%02d] %8.8lx:", my_cpu, i);
+ sprintf(buf + strlen(buf), " %2.2x", data[i]);
+ if ((i & 0xf) == 0xf || i == length - 1) {
+ strcat(buf, "\n");
+ pr_info("%s", buf);
+ }
+ }
+}
+#endif
+
+
+/*
+ * Provide support for the __netio_fastio1() swint
+ * (see <hv/drv_xgbe_intf.h> for how it is used).
+ *
+ * The fastio swint2 call may clobber all the caller-saved registers.
+ * It rarely clobbers memory, but we allow for the possibility in
+ * the signature just to be on the safe side.
+ *
+ * Also, gcc doesn't seem to allow an input operand to be
+ * clobbered, so we fake it with dummy outputs.
+ *
+ * This function can't be static because of the way it is declared
+ * in the netio header.
+ */
+inline int __netio_fastio1(u32 fastio_index, u32 arg0)
+{
+ long result, clobber_r1, clobber_r10;
+ asm volatile("swint2"
+ : "=R00" (result),
+ "=R01" (clobber_r1), "=R10" (clobber_r10)
+ : "R10" (fastio_index), "R01" (arg0)
+ : "memory", "r2", "r3", "r4",
+ "r5", "r6", "r7", "r8", "r9",
+ "r11", "r12", "r13", "r14",
+ "r15", "r16", "r17", "r18", "r19",
+ "r20", "r21", "r22", "r23", "r24",
+ "r25", "r26", "r27", "r28", "r29");
+ return result;
+}
+
+
+/*
+ * Provide a linux buffer to LIPP.
+ */
+static void tile_net_provide_linux_buffer(struct tile_net_cpu *info,
+ void *va, bool small)
+{
+ struct tile_netio_queue *queue = &info->queue;
+
+ /* Convert "va" and "small" to "linux_buffer_t". */
+ unsigned int buffer = ((unsigned int)(__pa(va) >> 7) << 1) + small;
+
+ __netio_fastio_free_buffer(queue->__user_part.__fastio_index, buffer);
+}
+
+
+/*
+ * Provide a linux buffer for LIPP.
+ *
+ * Note that the ACTUAL allocation for each buffer is a "struct sk_buff",
+ * plus a chunk of memory that includes not only the requested bytes, but
+ * also NET_SKB_PAD bytes of initial padding, and a "struct skb_shared_info".
+ *
+ * Note that "struct skb_shared_info" is 88 bytes with 64K pages and
+ * 268 bytes with 4K pages (since the frags[] array needs 18 entries).
+ *
+ * Without jumbo packets, the maximum packet size will be 1536 bytes,
+ * and we use 2 bytes (NET_IP_ALIGN) of padding. ISSUE: If we told
+ * the hardware to clip at 1518 bytes instead of 1536 bytes, then we
+ * could save an entire cache line, but in practice, we don't need it.
+ *
+ * Since CPAs are 38 bits, and we can only encode the high 31 bits in
+ * a "linux_buffer_t", the low 7 bits must be zero, and thus, we must
+ * align the actual "va" mod 128.
+ *
+ * We assume that the underlying "head" will be aligned mod 64. Note
+ * that in practice, we have seen "head" NOT aligned mod 128 even when
+ * using 2048 byte allocations, which is surprising.
+ *
+ * If "head" WAS always aligned mod 128, we could change LIPP to
+ * assume that the low SIX bits are zero, and the 7th bit is one, that
+ * is, align the actual "va" mod 128 plus 64, which would be "free".
+ *
+ * For now, the actual "head" pointer points at NET_SKB_PAD bytes of
+ * padding, plus 28 or 92 bytes of extra padding, plus the sk_buff
+ * pointer, plus the NET_IP_ALIGN padding, plus 126 or 1536 bytes for
+ * the actual packet, plus 62 bytes of empty padding, plus some
+ * padding and the "struct skb_shared_info".
+ *
+ * With 64K pages, a large buffer thus needs 32+92+4+2+1536+62+88
+ * bytes, or 1816 bytes, which fits comfortably into 2048 bytes.
+ *
+ * With 64K pages, a small buffer thus needs 32+92+4+2+126+88
+ * bytes, or 344 bytes, which means we are wasting 64+ bytes, and
+ * could presumably increase the size of small buffers.
+ *
+ * With 4K pages, a large buffer thus needs 32+92+4+2+1536+62+268
+ * bytes, or 1996 bytes, which fits comfortably into 2048 bytes.
+ *
+ * With 4K pages, a small buffer thus needs 32+92+4+2+126+268
+ * bytes, or 524 bytes, which is annoyingly wasteful.
+ *
+ * Maybe we should increase LIPP_SMALL_PACKET_SIZE to 192?
+ *
+ * ISSUE: Maybe we should increase "NET_SKB_PAD" to 64?
+ */
+static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info,
+ bool small)
+{
+#if TILE_NET_MTU <= 1536
+ /* Without "jumbo", 2 + 1536 should be sufficient. */
+ unsigned int large_size = NET_IP_ALIGN + 1536;
+#else
+ /* ISSUE: This has not been tested. */
+ unsigned int large_size = NET_IP_ALIGN + TILE_NET_MTU + 100;
+#endif
+
+ /* Avoid "false sharing" with last cache line. */
+ /* ISSUE: This is already done by "dev_alloc_skb()". */
+ unsigned int len =
+ (((small ? LIPP_SMALL_PACKET_SIZE : large_size) +
+ CHIP_L2_LINE_SIZE() - 1) & -CHIP_L2_LINE_SIZE());
+
+ unsigned int padding = 128 - NET_SKB_PAD;
+ unsigned int align;
+
+ struct sk_buff *skb;
+ void *va;
+
+ struct sk_buff **skb_ptr;
+
+ /* Request 96 extra bytes for alignment purposes. */
+ skb = dev_alloc_skb(len + padding);
+ if (skb == NULL)
+ return false;
+
+ /* Skip 32 or 96 bytes to align "data" mod 128. */
+ align = -(long)skb->data & (128 - 1);
+ BUG_ON(align > padding);
+ skb_reserve(skb, align);
+
+ /* This address is given to IPP. */
+ va = skb->data;
+
+ /* Buffers must not span a huge page. */
+ BUG_ON(((((long)va & ~HPAGE_MASK) + len) & HPAGE_MASK) != 0);
+
+#ifdef TILE_NET_PARANOIA
+#if CHIP_HAS_CBOX_HOME_MAP()
+ if (hash_default) {
+ HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)va);
+ if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
+ panic("Non-HFH ingress buffer! VA=%p Mode=%d PTE=%llx",
+ va, hv_pte_get_mode(pte), hv_pte_val(pte));
+ }
+#endif
+#endif
+
+ /* Invalidate the packet buffer. */
+ if (!hash_default)
+ __inv_buffer(va, len);
+
+ /* Skip two bytes to satisfy LIPP assumptions. */
+ /* Note that this aligns IP on a 16 byte boundary. */
+ /* ISSUE: Do this when the packet arrives? */
+ skb_reserve(skb, NET_IP_ALIGN);
+
+ /* Save a back-pointer to 'skb'. */
+ skb_ptr = va - sizeof(*skb_ptr);
+ *skb_ptr = skb;
+
+ /* Make sure "skb_ptr" has been flushed. */
+ __insn_mf();
+
+ /* Provide the new buffer. */
+ tile_net_provide_linux_buffer(info, va, small);
+
+ return true;
+}
+
+
+/*
+ * Provide linux buffers for LIPP.
+ */
+static void tile_net_provide_needed_buffers(struct tile_net_cpu *info)
+{
+ while (info->num_needed_small_buffers != 0) {
+ if (!tile_net_provide_needed_buffer(info, true))
+ goto oops;
+ info->num_needed_small_buffers--;
+ }
+
+ while (info->num_needed_large_buffers != 0) {
+ if (!tile_net_provide_needed_buffer(info, false))
+ goto oops;
+ info->num_needed_large_buffers--;
+ }
+
+ return;
+
+oops:
+
+ /* Add a description to the page allocation failure dump. */
+ pr_notice("Could not provide a linux buffer to LIPP.\n");
+}
+
+
+/*
+ * Grab some LEPP completions, and store them in "comps", of size
+ * "comps_size", and return the number of completions which were
+ * stored, so the caller can free them.
+ */
+static unsigned int tile_net_lepp_grab_comps(lepp_queue_t *eq,
+ struct sk_buff *comps[],
+ unsigned int comps_size,
+ unsigned int min_size)
+{
+ unsigned int n = 0;
+
+ unsigned int comp_head = eq->comp_head;
+ unsigned int comp_busy = eq->comp_busy;
+
+ while (comp_head != comp_busy && n < comps_size) {
+ comps[n++] = eq->comps[comp_head];
+ LEPP_QINC(comp_head);
+ }
+
+ if (n < min_size)
+ return 0;
+
+ eq->comp_head = comp_head;
+
+ return n;
+}
+
+
+/*
+ * Free some comps, and return true iff there are still some pending.
+ */
+static bool tile_net_lepp_free_comps(struct net_device *dev, bool all)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+
+ lepp_queue_t *eq = priv->eq;
+
+ struct sk_buff *olds[64];
+ unsigned int wanted = 64;
+ unsigned int i, n;
+ bool pending;
+
+ spin_lock(&priv->eq_lock);
+
+ if (all)
+ eq->comp_busy = eq->comp_tail;
+
+ n = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
+
+ pending = (eq->comp_head != eq->comp_tail);
+
+ spin_unlock(&priv->eq_lock);
+
+ for (i = 0; i < n; i++)
+ kfree_skb(olds[i]);
+
+ return pending;
+}
+
+
+/*
+ * Make sure the egress timer is scheduled.
+ *
+ * Note that we use "schedule if not scheduled" logic instead of the more
+ * obvious "reschedule" logic, because "reschedule" is fairly expensive.
+ */
+static void tile_net_schedule_egress_timer(struct tile_net_cpu *info)
+{
+ if (!info->egress_timer_scheduled) {
+ mod_timer_pinned(&info->egress_timer, jiffies + 1);
+ info->egress_timer_scheduled = true;
+ }
+}
+
+
+/*
+ * The "function" for "info->egress_timer".
+ *
+ * This timer will reschedule itself as long as there are any pending
+ * completions expected (on behalf of any tile).
+ *
+ * ISSUE: Realistically, will the timer ever stop scheduling itself?
+ *
+ * ISSUE: This timer is almost never actually needed, so just use a global
+ * timer that can run on any tile.
+ *
+ * ISSUE: Maybe instead track number of expected completions, and free
+ * only that many, resetting to zero if "pending" is ever false.
+ */
+static void tile_net_handle_egress_timer(unsigned long arg)
+{
+ struct tile_net_cpu *info = (struct tile_net_cpu *)arg;
+ struct net_device *dev = info->napi.dev;
+
+ /* The timer is no longer scheduled. */
+ info->egress_timer_scheduled = false;
+
+ /* Free comps, and reschedule timer if more are pending. */
+ if (tile_net_lepp_free_comps(dev, false))
+ tile_net_schedule_egress_timer(info);
+}
+
+
+#ifdef IGNORE_DUP_ACKS
+
+/*
+ * Help detect "duplicate" ACKs. These are sequential packets (for a
+ * given flow) which are exactly 66 bytes long, sharing everything but
+ * ID=2@0x12, Hsum=2@0x18, Ack=4@0x2a, WinSize=2@0x30, Csum=2@0x32,
+ * Tstamps=10@0x38. The ID's are +1, the Hsum's are -1, the Ack's are
+ * +N, and the Tstamps are usually identical.
+ *
+ * NOTE: Apparently truly duplicate acks (with identical "ack" values),
+ * should not be collapsed, as they are used for some kind of flow control.
+ */
+static bool is_dup_ack(char *s1, char *s2, unsigned int len)
+{
+ int i;
+
+ unsigned long long ignorable = 0;
+
+ /* Identification. */
+ ignorable |= (1ULL << 0x12);
+ ignorable |= (1ULL << 0x13);
+
+ /* Header checksum. */
+ ignorable |= (1ULL << 0x18);
+ ignorable |= (1ULL << 0x19);
+
+ /* ACK. */
+ ignorable |= (1ULL << 0x2a);
+ ignorable |= (1ULL << 0x2b);
+ ignorable |= (1ULL << 0x2c);
+ ignorable |= (1ULL << 0x2d);
+
+ /* WinSize. */
+ ignorable |= (1ULL << 0x30);
+ ignorable |= (1ULL << 0x31);
+
+ /* Checksum. */
+ ignorable |= (1ULL << 0x32);
+ ignorable |= (1ULL << 0x33);
+
+ for (i = 0; i < len; i++, ignorable >>= 1) {
+
+ if ((ignorable & 1) || (s1[i] == s2[i]))
+ continue;
+
+#ifdef TILE_NET_DEBUG
+ /* HACK: Mention non-timestamp diffs. */
+ if (i < 0x38 && i != 0x2f &&
+ net_ratelimit())
+ pr_info("Diff at 0x%x\n", i);
+#endif
+
+ return false;
+ }
+
+#ifdef TILE_NET_NO_SUPPRESS_DUP_ACKS
+ /* HACK: Do not suppress truly duplicate ACKs. */
+ /* ISSUE: Is this actually necessary or helpful? */
+ if (s1[0x2a] == s2[0x2a] &&
+ s1[0x2b] == s2[0x2b] &&
+ s1[0x2c] == s2[0x2c] &&
+ s1[0x2d] == s2[0x2d]) {
+ return false;
+ }
+#endif
+
+ return true;
+}
+
+#endif
+
+
+
+static void tile_net_discard_aux(struct tile_net_cpu *info, int index)
+{
+ struct tile_netio_queue *queue = &info->queue;
+ netio_queue_impl_t *qsp = queue->__system_part;
+ netio_queue_user_impl_t *qup = &queue->__user_part;
+
+ int index2_aux = index + sizeof(netio_pkt_t);
+ int index2 =
+ ((index2_aux ==
+ qsp->__packet_receive_queue.__last_packet_plus_one) ?
+ 0 : index2_aux);
+
+ netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
+
+ /* Extract the "linux_buffer_t". */
+ unsigned int buffer = pkt->__packet.word;
+
+ /* Convert "linux_buffer_t" to "va". */
+ void *va = __va((phys_addr_t)(buffer >> 1) << 7);
+
+ /* Acquire the associated "skb". */
+ struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
+ struct sk_buff *skb = *skb_ptr;
+
+ kfree_skb(skb);
+
+ /* Consume this packet. */
+ qup->__packet_receive_read = index2;
+}
+
+
+/*
+ * Like "tile_net_poll()", but just discard packets.
+ */
+static void tile_net_discard_packets(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+ struct tile_netio_queue *queue = &info->queue;
+ netio_queue_impl_t *qsp = queue->__system_part;
+ netio_queue_user_impl_t *qup = &queue->__user_part;
+
+ while (qup->__packet_receive_read !=
+ qsp->__packet_receive_queue.__packet_write) {
+ int index = qup->__packet_receive_read;
+ tile_net_discard_aux(info, index);
+ }
+}
+
+
+/*
+ * Handle the next packet. Return true if "processed", false if "filtered".
+ */
+static bool tile_net_poll_aux(struct tile_net_cpu *info, int index)
+{
+ struct net_device *dev = info->napi.dev;
+
+ struct tile_netio_queue *queue = &info->queue;
+ netio_queue_impl_t *qsp = queue->__system_part;
+ netio_queue_user_impl_t *qup = &queue->__user_part;
+ struct tile_net_stats_t *stats = &info->stats;
+
+ int filter;
+
+ int index2_aux = index + sizeof(netio_pkt_t);
+ int index2 =
+ ((index2_aux ==
+ qsp->__packet_receive_queue.__last_packet_plus_one) ?
+ 0 : index2_aux);
+
+ netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
+
+ netio_pkt_metadata_t *metadata = NETIO_PKT_METADATA(pkt);
+
+ /* Extract the packet size. FIXME: Shouldn't the second line */
+ /* get subtracted? Mostly moot, since it should be "zero". */
+ unsigned long len =
+ (NETIO_PKT_CUSTOM_LENGTH(pkt) +
+ NET_IP_ALIGN - NETIO_PACKET_PADDING);
+
+ /* Extract the "linux_buffer_t". */
+ unsigned int buffer = pkt->__packet.word;
+
+ /* Extract "small" (vs "large"). */
+ bool small = ((buffer & 1) != 0);
+
+ /* Convert "linux_buffer_t" to "va". */
+ void *va = __va((phys_addr_t)(buffer >> 1) << 7);
+
+ /* Extract the packet data pointer. */
+ /* Compare to "NETIO_PKT_CUSTOM_DATA(pkt)". */
+ unsigned char *buf = va + NET_IP_ALIGN;
+
+ /* Invalidate the packet buffer. */
+ if (!hash_default)
+ __inv_buffer(buf, len);
+
+ /* ISSUE: Is this needed? */
+ dev->last_rx = jiffies;
+
+#ifdef TILE_NET_DUMP_PACKETS
+ dump_packet(buf, len, "rx");
+#endif /* TILE_NET_DUMP_PACKETS */
+
+#ifdef TILE_NET_VERIFY_INGRESS
+ if (!NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt) &&
+ NETIO_PKT_L4_CSUM_CALCULATED_M(metadata, pkt)) {
+ /* Bug 6624: Includes UDP packets with a "zero" checksum. */
+ pr_warning("Bad L4 checksum on %d byte packet.\n", len);
+ }
+ if (!NETIO_PKT_L3_CSUM_CORRECT_M(metadata, pkt) &&
+ NETIO_PKT_L3_CSUM_CALCULATED_M(metadata, pkt)) {
+ dump_packet(buf, len, "rx");
+ panic("Bad L3 checksum.");
+ }
+ switch (NETIO_PKT_STATUS_M(metadata, pkt)) {
+ case NETIO_PKT_STATUS_OVERSIZE:
+ if (len >= 64) {
+ dump_packet(buf, len, "rx");
+ panic("Unexpected OVERSIZE.");
+ }
+ break;
+ case NETIO_PKT_STATUS_BAD:
+ pr_warning("Unexpected BAD %ld byte packet.\n", len);
+ }
+#endif
+
+ filter = 0;
+
+ /* ISSUE: Filter TCP packets with "bad" checksums? */
+
+ if (!(dev->flags & IFF_UP)) {
+ /* Filter packets received before we're up. */
+ filter = 1;
+ } else if (NETIO_PKT_STATUS_M(metadata, pkt) == NETIO_PKT_STATUS_BAD) {
+ /* Filter "truncated" packets. */
+ filter = 1;
+ } else if (!(dev->flags & IFF_PROMISC)) {
+ /* FIXME: Implement HW multicast filter. */
+ if (!is_multicast_ether_addr(buf)) {
+ /* Filter packets not for our address. */
+ const u8 *mine = dev->dev_addr;
+ filter = compare_ether_addr(mine, buf);
+ }
+ }
+
+ if (filter) {
+
+ /* ISSUE: Update "drop" statistics? */
+
+ tile_net_provide_linux_buffer(info, va, small);
+
+ } else {
+
+ /* Acquire the associated "skb". */
+ struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
+ struct sk_buff *skb = *skb_ptr;
+
+ /* Paranoia. */
+ if (skb->data != buf)
+ panic("Corrupt linux buffer from LIPP! "
+ "VA=%p, skb=%p, skb->data=%p\n",
+ va, skb, skb->data);
+
+ /* Encode the actual packet length. */
+ skb_put(skb, len);
+
+ /* NOTE: This call also sets "skb->dev = dev". */
+ skb->protocol = eth_type_trans(skb, dev);
+
+ /* Avoid recomputing "good" TCP/UDP checksums. */
+ if (NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ netif_receive_skb(skb);
+
+ stats->rx_packets++;
+ stats->rx_bytes += len;
+
+ if (small)
+ info->num_needed_small_buffers++;
+ else
+ info->num_needed_large_buffers++;
+ }
+
+ /* Return four credits after every fourth packet. */
+ if (--qup->__receive_credit_remaining == 0) {
+ u32 interval = qup->__receive_credit_interval;
+ qup->__receive_credit_remaining = interval;
+ __netio_fastio_return_credits(qup->__fastio_index, interval);
+ }
+
+ /* Consume this packet. */
+ qup->__packet_receive_read = index2;
+
+ return !filter;
+}
+
+
+/*
+ * Handle some packets for the given device on the current CPU.
+ *
+ * If "tile_net_stop()" is called on some other tile while this
+ * function is running, we will return, hopefully before that
+ * other tile asks us to call "napi_disable()".
+ *
+ * The "rotting packet" race condition occurs if a packet arrives
+ * during the extremely narrow window between the queue appearing to
+ * be empty, and the ingress interrupt being re-enabled. This happens
+ * a LOT under heavy network load.
+ */
+static int tile_net_poll(struct napi_struct *napi, int budget)
+{
+ struct net_device *dev = napi->dev;
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+ struct tile_netio_queue *queue = &info->queue;
+ netio_queue_impl_t *qsp = queue->__system_part;
+ netio_queue_user_impl_t *qup = &queue->__user_part;
+
+ unsigned int work = 0;
+
+ while (priv->active) {
+ int index = qup->__packet_receive_read;
+ if (index == qsp->__packet_receive_queue.__packet_write)
+ break;
+
+ if (tile_net_poll_aux(info, index)) {
+ if (++work >= budget)
+ goto done;
+ }
+ }
+
+ napi_complete(&info->napi);
+
+ if (!priv->active)
+ goto done;
+
+ /* Re-enable the ingress interrupt. */
+ enable_percpu_irq(priv->intr_id);
+
+ /* HACK: Avoid the "rotting packet" problem (see above). */
+ if (qup->__packet_receive_read !=
+ qsp->__packet_receive_queue.__packet_write) {
+ /* ISSUE: Sometimes this returns zero, presumably */
+ /* because an interrupt was handled for this tile. */
+ (void)napi_reschedule(&info->napi);
+ }
+
+done:
+
+ if (priv->active)
+ tile_net_provide_needed_buffers(info);
+
+ return work;
+}
+
+
+/*
+ * Handle an ingress interrupt for the given device on the current cpu.
+ *
+ * ISSUE: Sometimes this gets called after "disable_percpu_irq()" has
+ * been called! This is probably due to "pending hypervisor downcalls".
+ *
+ * ISSUE: Is there any race condition between the "napi_schedule()" here
+ * and the "napi_complete()" call above?
+ */
+static irqreturn_t tile_net_handle_ingress_interrupt(int irq, void *dev_ptr)
+{
+ struct net_device *dev = (struct net_device *)dev_ptr;
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+ /* Disable the ingress interrupt. */
+ disable_percpu_irq(priv->intr_id);
+
+ /* Ignore unwanted interrupts. */
+ if (!priv->active)
+ return IRQ_HANDLED;
+
+ /* ISSUE: Sometimes "info->napi_enabled" is false here. */
+
+ napi_schedule(&info->napi);
+
+ return IRQ_HANDLED;
+}
+
+
+/*
+ * One time initialization per interface.
+ */
+static int tile_net_open_aux(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+
+ int ret;
+ int dummy;
+ unsigned int epp_lotar;
+
+ /*
+ * Find out where EPP memory should be homed.
+ */
+ ret = hv_dev_pread(priv->hv_devhdl, 0,
+ (HV_VirtAddr)&epp_lotar, sizeof(epp_lotar),
+ NETIO_EPP_SHM_OFF);
+ if (ret < 0) {
+ pr_err("could not read epp_shm_queue lotar.\n");
+ return -EIO;
+ }
+
+ /*
+ * Home the page on the EPP.
+ */
+ {
+ int epp_home = hv_lotar_to_cpu(epp_lotar);
+ homecache_change_page_home(priv->eq_pages, EQ_ORDER, epp_home);
+ }
+
+ /*
+ * Register the EPP shared memory queue.
+ */
+ {
+ netio_ipp_address_t ea = {
+ .va = 0,
+ .pa = __pa(priv->eq),
+ .pte = hv_pte(0),
+ .size = EQ_SIZE,
+ };
+ ea.pte = hv_pte_set_lotar(ea.pte, epp_lotar);
+ ea.pte = hv_pte_set_mode(ea.pte, HV_PTE_MODE_CACHE_TILE_L3);
+ ret = hv_dev_pwrite(priv->hv_devhdl, 0,
+ (HV_VirtAddr)&ea,
+ sizeof(ea),
+ NETIO_EPP_SHM_OFF);
+ if (ret < 0)
+ return -EIO;
+ }
+
+ /*
+ * Start LIPP/LEPP.
+ */
+ if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+ sizeof(dummy), NETIO_IPP_START_SHIM_OFF) < 0) {
+ pr_warning("Failed to start LIPP/LEPP.\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Register with hypervisor on the current CPU.
+ *
+ * Strangely, this function does important things even if it "fails",
+ * which is especially common if the link is not up yet. Hopefully
+ * these things are all "harmless" if done twice!
+ */
+static void tile_net_register(void *dev_ptr)
+{
+ struct net_device *dev = (struct net_device *)dev_ptr;
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info;
+
+ struct tile_netio_queue *queue;
+
+ /* Only network cpus can receive packets. */
+ int queue_id =
+ cpumask_test_cpu(my_cpu, &priv->network_cpus_map) ? 0 : 255;
+
+ netio_input_config_t config = {
+ .flags = 0,
+ .num_receive_packets = priv->network_cpus_credits,
+ .queue_id = queue_id
+ };
+
+ int ret = 0;
+ netio_queue_impl_t *queuep;
+
+ PDEBUG("tile_net_register(queue_id %d)\n", queue_id);
+
+ if (!strcmp(dev->name, "xgbe0"))
+ info = &__get_cpu_var(hv_xgbe0);
+ else if (!strcmp(dev->name, "xgbe1"))
+ info = &__get_cpu_var(hv_xgbe1);
+ else if (!strcmp(dev->name, "gbe0"))
+ info = &__get_cpu_var(hv_gbe0);
+ else if (!strcmp(dev->name, "gbe1"))
+ info = &__get_cpu_var(hv_gbe1);
+ else
+ BUG();
+
+ /* Initialize the egress timer. */
+ init_timer(&info->egress_timer);
+ info->egress_timer.data = (long)info;
+ info->egress_timer.function = tile_net_handle_egress_timer;
+
+ priv->cpu[my_cpu] = info;
+
+ /*
+ * Register ourselves with LIPP. This does a lot of stuff,
+ * including invoking the LIPP registration code.
+ */
+ ret = hv_dev_pwrite(priv->hv_devhdl, 0,
+ (HV_VirtAddr)&config,
+ sizeof(netio_input_config_t),
+ NETIO_IPP_INPUT_REGISTER_OFF);
+ PDEBUG("hv_dev_pwrite(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
+ ret);
+ if (ret < 0) {
+ if (ret != NETIO_LINK_DOWN) {
+ printk(KERN_DEBUG "hv_dev_pwrite "
+ "NETIO_IPP_INPUT_REGISTER_OFF failure %d\n",
+ ret);
+ }
+ info->link_down = (ret == NETIO_LINK_DOWN);
+ return;
+ }
+
+ /*
+ * Get the pointer to our queue's system part.
+ */
+
+ ret = hv_dev_pread(priv->hv_devhdl, 0,
+ (HV_VirtAddr)&queuep,
+ sizeof(netio_queue_impl_t *),
+ NETIO_IPP_INPUT_REGISTER_OFF);
+ PDEBUG("hv_dev_pread(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
+ ret);
+ PDEBUG("queuep %p\n", queuep);
+ if (ret <= 0) {
+ /* ISSUE: Shouldn't this be a fatal error? */
+ pr_err("hv_dev_pread NETIO_IPP_INPUT_REGISTER_OFF failure\n");
+ return;
+ }
+
+ queue = &info->queue;
+
+ queue->__system_part = queuep;
+
+ memset(&queue->__user_part, 0, sizeof(netio_queue_user_impl_t));
+
+ /* This is traditionally "config.num_receive_packets / 2". */
+ queue->__user_part.__receive_credit_interval = 4;
+ queue->__user_part.__receive_credit_remaining =
+ queue->__user_part.__receive_credit_interval;
+
+ /*
+ * Get a fastio index from the hypervisor.
+ * ISSUE: Shouldn't this check the result?
+ */
+ ret = hv_dev_pread(priv->hv_devhdl, 0,
+ (HV_VirtAddr)&queue->__user_part.__fastio_index,
+ sizeof(queue->__user_part.__fastio_index),
+ NETIO_IPP_GET_FASTIO_OFF);
+ PDEBUG("hv_dev_pread(NETIO_IPP_GET_FASTIO_OFF) returned %d\n", ret);
+
+ /* Now we are registered. */
+ info->registered = true;
+}
+
+
+/*
+ * Deregister with hypervisor on the current CPU.
+ *
+ * This simply discards all our credits, so no more packets will be
+ * delivered to this tile. There may still be packets in our queue.
+ *
+ * Also, disable the ingress interrupt.
+ */
+static void tile_net_deregister(void *dev_ptr)
+{
+ struct net_device *dev = (struct net_device *)dev_ptr;
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+ /* Disable the ingress interrupt. */
+ disable_percpu_irq(priv->intr_id);
+
+ /* Do nothing else if not registered. */
+ if (info == NULL || !info->registered)
+ return;
+
+ {
+ struct tile_netio_queue *queue = &info->queue;
+ netio_queue_user_impl_t *qup = &queue->__user_part;
+
+ /* Discard all our credits. */
+ __netio_fastio_return_credits(qup->__fastio_index, -1);
+ }
+}
+
+
+/*
+ * Unregister with hypervisor on the current CPU.
+ *
+ * Also, disable the ingress interrupt.
+ */
+static void tile_net_unregister(void *dev_ptr)
+{
+ struct net_device *dev = (struct net_device *)dev_ptr;
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+ int ret;
+ int dummy = 0;
+
+ /* Disable the ingress interrupt. */
+ disable_percpu_irq(priv->intr_id);
+
+ /* Do nothing else if not registered. */
+ if (info == NULL || !info->registered)
+ return;
+
+ /* Unregister ourselves with LIPP/LEPP. */
+ ret = hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+ sizeof(dummy), NETIO_IPP_INPUT_UNREGISTER_OFF);
+ if (ret < 0)
+ panic("Failed to unregister with LIPP/LEPP!\n");
+
+ /* Discard all packets still in our NetIO queue. */
+ tile_net_discard_packets(dev);
+
+ /* Reset state. */
+ info->num_needed_small_buffers = 0;
+ info->num_needed_large_buffers = 0;
+
+ /* Cancel egress timer. */
+ del_timer(&info->egress_timer);
+ info->egress_timer_scheduled = false;
+}
+
+
+/*
+ * Helper function for "tile_net_stop()".
+ *
+ * Also used to handle registration failure in "tile_net_open_inner()",
+ * when the various extra steps in "tile_net_stop()" are not necessary.
+ */
+static void tile_net_stop_aux(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int i;
+
+ int dummy = 0;
+
+ /*
+ * Unregister all tiles, so LIPP will stop delivering packets.
+ * Also, delete all the "napi" objects (sequentially, to protect
+ * "dev->napi_list").
+ */
+ on_each_cpu(tile_net_unregister, (void *)dev, 1);
+ for_each_online_cpu(i) {
+ struct tile_net_cpu *info = priv->cpu[i];
+ if (info != NULL && info->registered) {
+ netif_napi_del(&info->napi);
+ info->registered = false;
+ }
+ }
+
+ /* Stop LIPP/LEPP. */
+ if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+ sizeof(dummy), NETIO_IPP_STOP_SHIM_OFF) < 0)
+ panic("Failed to stop LIPP/LEPP!\n");
+
+ priv->partly_opened = 0;
+}
+
+
+/*
+ * Disable NAPI for the given device on the current cpu.
+ */
+static void tile_net_stop_disable(void *dev_ptr)
+{
+ struct net_device *dev = (struct net_device *)dev_ptr;
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+ /* Disable NAPI if needed. */
+ if (info != NULL && info->napi_enabled) {
+ napi_disable(&info->napi);
+ info->napi_enabled = false;
+ }
+}
+
+
+/*
+ * Enable NAPI and the ingress interrupt for the given device
+ * on the current cpu.
+ *
+ * ISSUE: Only do this for "network cpus"?
+ */
+static void tile_net_open_enable(void *dev_ptr)
+{
+ struct net_device *dev = (struct net_device *)dev_ptr;
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+
+ /* Enable NAPI. */
+ napi_enable(&info->napi);
+ info->napi_enabled = true;
+
+ /* Enable the ingress interrupt. */
+ enable_percpu_irq(priv->intr_id);
+}
+
+
+/*
+ * tile_net_open_inner does most of the work of bringing up the interface.
+ * It's called from tile_net_open(), and also from tile_net_retry_open().
+ * The return value is 0 if the interface was brought up, < 0 if
+ * tile_net_open() should return the return value as an error, and > 0 if
+ * tile_net_open() should return success and schedule a work item to
+ * periodically retry the bringup.
+ */
+static int tile_net_open_inner(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info;
+ struct tile_netio_queue *queue;
+ int result = 0;
+ int i;
+ int dummy = 0;
+
+ /*
+ * First try to register just on the local CPU, and handle any
+ * semi-expected "link down" failure specially. Note that we
+ * do NOT call "tile_net_stop_aux()", unlike below.
+ */
+ tile_net_register(dev);
+ info = priv->cpu[my_cpu];
+ if (!info->registered) {
+ if (info->link_down)
+ return 1;
+ return -EAGAIN;
+ }
+
+ /*
+ * Now register everywhere else. If any registration fails,
+ * even for "link down" (which might not be possible), we
+ * clean up using "tile_net_stop_aux()". Also, add all the
+ * "napi" objects (sequentially, to protect "dev->napi_list").
+ * ISSUE: Only use "netif_napi_add()" for "network cpus"?
+ */
+ smp_call_function(tile_net_register, (void *)dev, 1);
+ for_each_online_cpu(i) {
+ struct tile_net_cpu *info = priv->cpu[i];
+ if (info->registered)
+ netif_napi_add(dev, &info->napi, tile_net_poll, 64);
+ else
+ result = -EAGAIN;
+ }
+ if (result != 0) {
+ tile_net_stop_aux(dev);
+ return result;
+ }
+
+ queue = &info->queue;
+
+ if (priv->intr_id == 0) {
+ unsigned int irq;
+
+ /*
+ * Acquire the irq allocated by the hypervisor. Every
+ * queue gets the same irq. The "__intr_id" field is
+ * "1 << irq", so we use "__ffs()" to extract "irq".
+ */
+ priv->intr_id = queue->__system_part->__intr_id;
+ BUG_ON(priv->intr_id == 0);
+ irq = __ffs(priv->intr_id);
+
+ /*
+ * Register the ingress interrupt handler for this
+ * device, permanently.
+ *
+ * We used to call "free_irq()" in "tile_net_stop()",
+ * and then re-register the handler here every time,
+ * but that caused DNP errors in "handle_IRQ_event()"
+ * because "desc->action" was NULL. See bug 9143.
+ */
+ tile_irq_activate(irq, TILE_IRQ_PERCPU);
+ BUG_ON(request_irq(irq, tile_net_handle_ingress_interrupt,
+ 0, dev->name, (void *)dev) != 0);
+ }
+
+ {
+ /* Allocate initial buffers. */
+
+ int max_buffers =
+ priv->network_cpus_count * priv->network_cpus_credits;
+
+ info->num_needed_small_buffers =
+ min(LIPP_SMALL_BUFFERS, max_buffers);
+
+ info->num_needed_large_buffers =
+ min(LIPP_LARGE_BUFFERS, max_buffers);
+
+ tile_net_provide_needed_buffers(info);
+
+ if (info->num_needed_small_buffers != 0 ||
+ info->num_needed_large_buffers != 0)
+ panic("Insufficient memory for buffer stack!");
+ }
+
+ /* We are about to be active. */
+ priv->active = true;
+
+ /* Make sure "active" is visible to all tiles. */
+ mb();
+
+ /* On each tile, enable NAPI and the ingress interrupt. */
+ on_each_cpu(tile_net_open_enable, (void *)dev, 1);
+
+ /* Start LIPP/LEPP and activate "ingress" at the shim. */
+ if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
+ sizeof(dummy), NETIO_IPP_INPUT_INIT_OFF) < 0)
+ panic("Failed to activate the LIPP Shim!\n");
+
+ /* Start our transmit queue. */
+ netif_start_queue(dev);
+
+ return 0;
+}
+
+
+/*
+ * Called periodically to retry bringing up the NetIO interface,
+ * if it doesn't come up cleanly during tile_net_open().
+ */
+static void tile_net_open_retry(struct work_struct *w)
+{
+ struct delayed_work *dw =
+ container_of(w, struct delayed_work, work);
+
+ struct tile_net_priv *priv =
+ container_of(dw, struct tile_net_priv, retry_work);
+
+ /*
+ * Try to bring the NetIO interface up. If it fails, reschedule
+ * ourselves to try again later; otherwise, tell Linux we now have
+ * a working link. ISSUE: What if the return value is negative?
+ */
+ if (tile_net_open_inner(priv->dev) != 0)
+ schedule_delayed_work(&priv->retry_work,
+ TILE_NET_RETRY_INTERVAL);
+ else
+ netif_carrier_on(priv->dev);
+}
+
+
+/*
+ * Called when a network interface is made active.
+ *
+ * Returns 0 on success, negative value on failure.
+ *
+ * The open entry point is called when a network interface is made
+ * active by the system (IFF_UP). At this point all resources needed
+ * for transmit and receive operations are allocated, the interrupt
+ * handler is registered with the OS (if needed), the watchdog timer
+ * is started, and the stack is notified that the interface is ready.
+ *
+ * If the actual link is not available yet, then we tell Linux that
+ * we have no carrier, and we keep checking until the link comes up.
+ */
+static int tile_net_open(struct net_device *dev)
+{
+ int ret = 0;
+ struct tile_net_priv *priv = netdev_priv(dev);
+
+ /*
+ * We rely on priv->partly_opened to tell us if this is the
+ * first time this interface is being brought up. If it is
+ * set, the IPP was already initialized and should not be
+ * initialized again.
+ */
+ if (!priv->partly_opened) {
+
+ int count;
+ int credits;
+
+ /* Initialize LIPP/LEPP, and start the Shim. */
+ ret = tile_net_open_aux(dev);
+ if (ret < 0) {
+ pr_err("tile_net_open_aux failed: %d\n", ret);
+ return ret;
+ }
+
+ /* Analyze the network cpus. */
+
+ if (network_cpus_used)
+ cpumask_copy(&priv->network_cpus_map,
+ &network_cpus_map);
+ else
+ cpumask_copy(&priv->network_cpus_map, cpu_online_mask);
+
+
+ count = cpumask_weight(&priv->network_cpus_map);
+
+ /* Limit credits to available buffers, and apply min. */
+ credits = max(16, (LIPP_LARGE_BUFFERS / count) & ~1);
+
+ /* Apply "GBE" max limit. */
+ /* ISSUE: Use higher limit for XGBE? */
+ credits = min(NETIO_MAX_RECEIVE_PKTS, credits);
+
+ priv->network_cpus_count = count;
+ priv->network_cpus_credits = credits;
+
+#ifdef TILE_NET_DEBUG
+ pr_info("Using %d network cpus, with %d credits each\n",
+ priv->network_cpus_count, priv->network_cpus_credits);
+#endif
+
+ priv->partly_opened = 1;
+
+ } else {
+ /* FIXME: Is this possible? */
+ /* printk("Already partly opened.\n"); */
+ }
+
+ /*
+ * Attempt to bring up the link.
+ */
+ ret = tile_net_open_inner(dev);
+ if (ret <= 0) {
+ if (ret == 0)
+ netif_carrier_on(dev);
+ return ret;
+ }
+
+ /*
+ * We were unable to bring up the NetIO interface, but we want to
+ * try again in a little bit. Tell Linux that we have no carrier
+ * so it doesn't try to use the interface before the link comes up
+ * and then remember to try again later.
+ */
+ netif_carrier_off(dev);
+ schedule_delayed_work(&priv->retry_work, TILE_NET_RETRY_INTERVAL);
+
+ return 0;
+}
+
+
+static int tile_net_drain_lipp_buffers(struct tile_net_priv *priv)
+{
+ int n = 0;
+
+ /* Drain all the LIPP buffers. */
+ while (true) {
+ int buffer;
+
+ /* NOTE: This should never fail. */
+ if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&buffer,
+ sizeof(buffer), NETIO_IPP_DRAIN_OFF) < 0)
+ break;
+
+ /* Stop when done. */
+ if (buffer == 0)
+ break;
+
+ {
+ /* Convert "linux_buffer_t" to "va". */
+ void *va = __va((phys_addr_t)(buffer >> 1) << 7);
+
+ /* Acquire the associated "skb". */
+ struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
+ struct sk_buff *skb = *skb_ptr;
+
+ kfree_skb(skb);
+ }
+
+ n++;
+ }
+
+ return n;
+}
+
+
+/*
+ * Disables a network interface.
+ *
+ * Returns 0, this is not allowed to fail.
+ *
+ * The close entry point is called when an interface is de-activated
+ * by the OS. The hardware is still under the drivers control, but
+ * needs to be disabled. A global MAC reset is issued to stop the
+ * hardware, and all transmit and receive resources are freed.
+ *
+ * ISSUE: How closely does "netif_running(dev)" mirror "priv->active"?
+ *
+ * Before we are called by "__dev_close()", "netif_running()" will
+ * have been cleared, so no NEW calls to "tile_net_poll()" will be
+ * made by "netpoll_poll_dev()".
+ *
+ * Often, this can cause some tiles to still have packets in their
+ * queues, so we must call "tile_net_discard_packets()" later.
+ *
+ * Note that some other tile may still be INSIDE "tile_net_poll()",
+ * and in fact, many will be, if there is heavy network load.
+ *
+ * Calling "on_each_cpu(tile_net_stop_disable, (void *)dev, 1)" when
+ * any tile is still "napi_schedule()"'d will induce a horrible crash
+ * when "msleep()" is called. This includes tiles which are inside
+ * "tile_net_poll()" which have not yet called "napi_complete()".
+ *
+ * So, we must first try to wait long enough for other tiles to finish
+ * with any current "tile_net_poll()" call, and, hopefully, to clear
+ * the "scheduled" flag. ISSUE: It is unclear what happens to tiles
+ * which have called "napi_schedule()" but which had not yet tried to
+ * call "tile_net_poll()", or which exhausted their budget inside
+ * "tile_net_poll()" just before this function was called.
+ */
+static int tile_net_stop(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+
+ PDEBUG("tile_net_stop()\n");
+
+ /* Start discarding packets. */
+ priv->active = false;
+
+ /* Make sure "active" is visible to all tiles. */
+ mb();
+
+ /*
+ * On each tile, make sure no NEW packets get delivered, and
+ * disable the ingress interrupt.
+ *
+ * Note that the ingress interrupt can fire AFTER this,
+ * presumably due to packets which were recently delivered,
+ * but it will have no effect.
+ */
+ on_each_cpu(tile_net_deregister, (void *)dev, 1);
+
+ /* Optimistically drain LIPP buffers. */
+ (void)tile_net_drain_lipp_buffers(priv);
+
+ /* ISSUE: Only needed if not yet fully open. */
+ cancel_delayed_work_sync(&priv->retry_work);
+
+ /* Can't transmit any more. */
+ netif_stop_queue(dev);
+
+ /* Disable NAPI on each tile. */
+ on_each_cpu(tile_net_stop_disable, (void *)dev, 1);
+
+ /*
+ * Drain any remaining LIPP buffers. NOTE: This "printk()"
+ * has never been observed, but in theory it could happen.
+ */
+ if (tile_net_drain_lipp_buffers(priv) != 0)
+ printk("Had to drain some extra LIPP buffers!\n");
+
+ /* Stop LIPP/LEPP. */
+ tile_net_stop_aux(dev);
+
+ /*
+ * ISSUE: It appears that, in practice anyway, by the time we
+ * get here, there are no pending completions, but just in case,
+ * we free (all of) them anyway.
+ */
+ while (tile_net_lepp_free_comps(dev, true))
+ /* loop */;
+
+ /* Wipe the EPP queue, and wait till the stores hit the EPP. */
+ memset(priv->eq, 0, sizeof(lepp_queue_t));
+ mb();
+
+ return 0;
+}
+
+
+/*
+ * Prepare the "frags" info for the resulting LEPP command.
+ *
+ * If needed, flush the memory used by the frags.
+ */
+static unsigned int tile_net_tx_frags(lepp_frag_t *frags,
+ struct sk_buff *skb,
+ void *b_data, unsigned int b_len)
+{
+ unsigned int i, n = 0;
+
+ struct skb_shared_info *sh = skb_shinfo(skb);
+
+ phys_addr_t cpa;
+
+ if (b_len != 0) {
+
+ if (!hash_default)
+ finv_buffer_remote(b_data, b_len, 0);
+
+ cpa = __pa(b_data);
+ frags[n].cpa_lo = cpa;
+ frags[n].cpa_hi = cpa >> 32;
+ frags[n].length = b_len;
+ frags[n].hash_for_home = hash_default;
+ n++;
+ }
+
+ for (i = 0; i < sh->nr_frags; i++) {
+
+ skb_frag_t *f = &sh->frags[i];
+ unsigned long pfn = page_to_pfn(f->page);
+
+ /* FIXME: Compute "hash_for_home" properly. */
+ /* ISSUE: The hypervisor checks CHIP_HAS_REV1_DMA_PACKETS(). */
+ int hash_for_home = hash_default;
+
+ /* FIXME: Hmmm. */
+ if (!hash_default) {
+ void *va = pfn_to_kaddr(pfn) + f->page_offset;
+ BUG_ON(PageHighMem(f->page));
+ finv_buffer_remote(va, f->size, 0);
+ }
+
+ cpa = ((phys_addr_t)pfn << PAGE_SHIFT) + f->page_offset;
+ frags[n].cpa_lo = cpa;
+ frags[n].cpa_hi = cpa >> 32;
+ frags[n].length = f->size;
+ frags[n].hash_for_home = hash_for_home;
+ n++;
+ }
+
+ return n;
+}
+
+
+/*
+ * This function takes "skb", consisting of a header template and a
+ * payload, and hands it to LEPP, to emit as one or more segments,
+ * each consisting of a possibly modified header, plus a piece of the
+ * payload, via a process known as "tcp segmentation offload".
+ *
+ * Usually, "data" will contain the header template, of size "sh_len",
+ * and "sh->frags" will contain "skb->data_len" bytes of payload, and
+ * there will be "sh->gso_segs" segments.
+ *
+ * Sometimes, if "sendfile()" requires copying, we will be called with
+ * "data" containing the header and payload, with "frags" being empty.
+ *
+ * In theory, "sh->nr_frags" could be 3, but in practice, it seems
+ * that this will never actually happen.
+ *
+ * See "emulate_large_send_offload()" for some reference code, which
+ * does not handle checksumming.
+ *
+ * ISSUE: How do we make sure that high memory DMA does not migrate?
+ */
+static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+ struct tile_net_stats_t *stats = &info->stats;
+
+ struct skb_shared_info *sh = skb_shinfo(skb);
+
+ unsigned char *data = skb->data;
+
+ /* The ip header follows the ethernet header. */
+ struct iphdr *ih = ip_hdr(skb);
+ unsigned int ih_len = ih->ihl * 4;
+
+ /* Note that "nh == ih", by definition. */
+ unsigned char *nh = skb_network_header(skb);
+ unsigned int eh_len = nh - data;
+
+ /* The tcp header follows the ip header. */
+ struct tcphdr *th = (struct tcphdr *)(nh + ih_len);
+ unsigned int th_len = th->doff * 4;
+
+ /* The total number of header bytes. */
+ /* NOTE: This may be less than skb_headlen(skb). */
+ unsigned int sh_len = eh_len + ih_len + th_len;
+
+ /* The number of payload bytes at "skb->data + sh_len". */
+ /* This is non-zero for sendfile() without HIGHDMA. */
+ unsigned int b_len = skb_headlen(skb) - sh_len;
+
+ /* The total number of payload bytes. */
+ unsigned int d_len = b_len + skb->data_len;
+
+ /* The maximum payload size. */
+ unsigned int p_len = sh->gso_size;
+
+ /* The total number of segments. */
+ unsigned int num_segs = sh->gso_segs;
+
+ /* The temporary copy of the command. */
+ u32 cmd_body[(LEPP_MAX_CMD_SIZE + 3) / 4];
+ lepp_tso_cmd_t *cmd = (lepp_tso_cmd_t *)cmd_body;
+
+ /* Analyze the "frags". */
+ unsigned int num_frags =
+ tile_net_tx_frags(cmd->frags, skb, data + sh_len, b_len);
+
+ /* The size of the command, including frags and header. */
+ size_t cmd_size = LEPP_TSO_CMD_SIZE(num_frags, sh_len);
+
+ /* The command header. */
+ lepp_tso_cmd_t cmd_init = {
+ .tso = true,
+ .header_size = sh_len,
+ .ip_offset = eh_len,
+ .tcp_offset = eh_len + ih_len,
+ .payload_size = p_len,
+ .num_frags = num_frags,
+ };
+
+ unsigned long irqflags;
+
+ lepp_queue_t *eq = priv->eq;
+
+ struct sk_buff *olds[8];
+ unsigned int wanted = 8;
+ unsigned int i, nolds = 0;
+
+ unsigned int cmd_head, cmd_tail, cmd_next;
+ unsigned int comp_tail;
+
+
+ /* Paranoia. */
+ BUG_ON(skb->protocol != htons(ETH_P_IP));
+ BUG_ON(ih->protocol != IPPROTO_TCP);
+ BUG_ON(skb->ip_summed != CHECKSUM_PARTIAL);
+ BUG_ON(num_frags > LEPP_MAX_FRAGS);
+ /*--BUG_ON(num_segs != (d_len + (p_len - 1)) / p_len); */
+ BUG_ON(num_segs <= 1);
+
+
+ /* Finish preparing the command. */
+
+ /* Copy the command header. */
+ *cmd = cmd_init;
+
+ /* Copy the "header". */
+ memcpy(&cmd->frags[num_frags], data, sh_len);
+
+
+ /* Prefetch and wait, to minimize time spent holding the spinlock. */
+ prefetch_L1(&eq->comp_tail);
+ prefetch_L1(&eq->cmd_tail);
+ mb();
+
+
+ /* Enqueue the command. */
+
+ spin_lock_irqsave(&priv->eq_lock, irqflags);
+
+ /*
+ * Handle completions if needed to make room.
+ * HACK: Spin until there is sufficient room.
+ */
+ if (lepp_num_free_comp_slots(eq) == 0) {
+ nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
+ if (nolds == 0) {
+busy:
+ spin_unlock_irqrestore(&priv->eq_lock, irqflags);
+ return NETDEV_TX_BUSY;
+ }
+ }
+
+ cmd_head = eq->cmd_head;
+ cmd_tail = eq->cmd_tail;
+
+ /* Prepare to advance, detecting full queue. */
+ cmd_next = cmd_tail + cmd_size;
+ if (cmd_tail < cmd_head && cmd_next >= cmd_head)
+ goto busy;
+ if (cmd_next > LEPP_CMD_LIMIT) {
+ cmd_next = 0;
+ if (cmd_next == cmd_head)
+ goto busy;
+ }
+
+ /* Copy the command. */
+ memcpy(&eq->cmds[cmd_tail], cmd, cmd_size);
+
+ /* Advance. */
+ cmd_tail = cmd_next;
+
+ /* Record "skb" for eventual freeing. */
+ comp_tail = eq->comp_tail;
+ eq->comps[comp_tail] = skb;
+ LEPP_QINC(comp_tail);
+ eq->comp_tail = comp_tail;
+
+ /* Flush before allowing LEPP to handle the command. */
+ /* ISSUE: Is this the optimal location for the flush? */
+ __insn_mf();
+
+ eq->cmd_tail = cmd_tail;
+
+ /* NOTE: Using "4" here is more efficient than "0" or "2", */
+ /* and, strangely, more efficient than pre-checking the number */
+ /* of available completions, and comparing it to 4. */
+ if (nolds == 0)
+ nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
+
+ spin_unlock_irqrestore(&priv->eq_lock, irqflags);
+
+ /* Handle completions. */
+ for (i = 0; i < nolds; i++)
+ kfree_skb(olds[i]);
+
+ /* Update stats. */
+ stats->tx_packets += num_segs;
+ stats->tx_bytes += (num_segs * sh_len) + d_len;
+
+ /* Make sure the egress timer is scheduled. */
+ tile_net_schedule_egress_timer(info);
+
+ return NETDEV_TX_OK;
+}
+
+
+/*
+ * Transmit a packet (called by the kernel via "hard_start_xmit" hook).
+ */
+static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+ int my_cpu = smp_processor_id();
+ struct tile_net_cpu *info = priv->cpu[my_cpu];
+ struct tile_net_stats_t *stats = &info->stats;
+
+ unsigned long irqflags;
+
+ struct skb_shared_info *sh = skb_shinfo(skb);
+
+ unsigned int len = skb->len;
+ unsigned char *data = skb->data;
+
+ unsigned int csum_start = skb_checksum_start_offset(skb);
+
+ lepp_frag_t frags[LEPP_MAX_FRAGS];
+
+ unsigned int num_frags;
+
+ lepp_queue_t *eq = priv->eq;
+
+ struct sk_buff *olds[8];
+ unsigned int wanted = 8;
+ unsigned int i, nolds = 0;
+
+ unsigned int cmd_size = sizeof(lepp_cmd_t);
+
+ unsigned int cmd_head, cmd_tail, cmd_next;
+ unsigned int comp_tail;
+
+ lepp_cmd_t cmds[LEPP_MAX_FRAGS];
+
+
+ /*
+ * This is paranoia, since we think that if the link doesn't come
+ * up, telling Linux we have no carrier will keep it from trying
+ * to transmit. If it does, though, we can't execute this routine,
+ * since data structures we depend on aren't set up yet.
+ */
+ if (!info->registered)
+ return NETDEV_TX_BUSY;
+
+
+ /* Save the timestamp. */
+ dev->trans_start = jiffies;
+
+
+#ifdef TILE_NET_PARANOIA
+#if CHIP_HAS_CBOX_HOME_MAP()
+ if (hash_default) {
+ HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)data);
+ if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
+ panic("Non-HFH egress buffer! VA=%p Mode=%d PTE=%llx",
+ data, hv_pte_get_mode(pte), hv_pte_val(pte));
+ }
+#endif
+#endif
+
+
+#ifdef TILE_NET_DUMP_PACKETS
+ /* ISSUE: Does not dump the "frags". */
+ dump_packet(data, skb_headlen(skb), "tx");
+#endif /* TILE_NET_DUMP_PACKETS */
+
+
+ if (sh->gso_size != 0)
+ return tile_net_tx_tso(skb, dev);
+
+
+ /* Prepare the commands. */
+
+ num_frags = tile_net_tx_frags(frags, skb, data, skb_headlen(skb));
+
+ for (i = 0; i < num_frags; i++) {
+
+ bool final = (i == num_frags - 1);
+
+ lepp_cmd_t cmd = {
+ .cpa_lo = frags[i].cpa_lo,
+ .cpa_hi = frags[i].cpa_hi,
+ .length = frags[i].length,
+ .hash_for_home = frags[i].hash_for_home,
+ .send_completion = final,
+ .end_of_packet = final
+ };
+
+ if (i == 0 && skb->ip_summed == CHECKSUM_PARTIAL) {
+ cmd.compute_checksum = 1;
+ cmd.checksum_data.bits.start_byte = csum_start;
+ cmd.checksum_data.bits.count = len - csum_start;
+ cmd.checksum_data.bits.destination_byte =
+ csum_start + skb->csum_offset;
+ }
+
+ cmds[i] = cmd;
+ }
+
+
+ /* Prefetch and wait, to minimize time spent holding the spinlock. */
+ prefetch_L1(&eq->comp_tail);
+ prefetch_L1(&eq->cmd_tail);
+ mb();
+
+
+ /* Enqueue the commands. */
+
+ spin_lock_irqsave(&priv->eq_lock, irqflags);
+
+ /*
+ * Handle completions if needed to make room.
+ * HACK: Spin until there is sufficient room.
+ */
+ if (lepp_num_free_comp_slots(eq) == 0) {
+ nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
+ if (nolds == 0) {
+busy:
+ spin_unlock_irqrestore(&priv->eq_lock, irqflags);
+ return NETDEV_TX_BUSY;
+ }
+ }
+
+ cmd_head = eq->cmd_head;
+ cmd_tail = eq->cmd_tail;
+
+ /* Copy the commands, or fail. */
+ for (i = 0; i < num_frags; i++) {
+
+ /* Prepare to advance, detecting full queue. */
+ cmd_next = cmd_tail + cmd_size;
+ if (cmd_tail < cmd_head && cmd_next >= cmd_head)
+ goto busy;
+ if (cmd_next > LEPP_CMD_LIMIT) {
+ cmd_next = 0;
+ if (cmd_next == cmd_head)
+ goto busy;
+ }
+
+ /* Copy the command. */
+ *(lepp_cmd_t *)&eq->cmds[cmd_tail] = cmds[i];
+
+ /* Advance. */
+ cmd_tail = cmd_next;
+ }
+
+ /* Record "skb" for eventual freeing. */
+ comp_tail = eq->comp_tail;
+ eq->comps[comp_tail] = skb;
+ LEPP_QINC(comp_tail);
+ eq->comp_tail = comp_tail;
+
+ /* Flush before allowing LEPP to handle the command. */
+ /* ISSUE: Is this the optimal location for the flush? */
+ __insn_mf();
+
+ eq->cmd_tail = cmd_tail;
+
+ /* NOTE: Using "4" here is more efficient than "0" or "2", */
+ /* and, strangely, more efficient than pre-checking the number */
+ /* of available completions, and comparing it to 4. */
+ if (nolds == 0)
+ nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
+
+ spin_unlock_irqrestore(&priv->eq_lock, irqflags);
+
+ /* Handle completions. */
+ for (i = 0; i < nolds; i++)
+ kfree_skb(olds[i]);
+
+ /* HACK: Track "expanded" size for short packets (e.g. 42 < 60). */
+ stats->tx_packets++;
+ stats->tx_bytes += ((len >= ETH_ZLEN) ? len : ETH_ZLEN);
+
+ /* Make sure the egress timer is scheduled. */
+ tile_net_schedule_egress_timer(info);
+
+ return NETDEV_TX_OK;
+}
+
+
+/*
+ * Deal with a transmit timeout.
+ */
+static void tile_net_tx_timeout(struct net_device *dev)
+{
+ PDEBUG("tile_net_tx_timeout()\n");
+ PDEBUG("Transmit timeout at %ld, latency %ld\n", jiffies,
+ jiffies - dev->trans_start);
+
+ /* XXX: ISSUE: This doesn't seem useful for us. */
+ netif_wake_queue(dev);
+}
+
+
+/*
+ * Ioctl commands.
+ */
+static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+ return -EOPNOTSUPP;
+}
+
+
+/*
+ * Get System Network Statistics.
+ *
+ * Returns the address of the device statistics structure.
+ */
+static struct net_device_stats *tile_net_get_stats(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+ u32 rx_packets = 0;
+ u32 tx_packets = 0;
+ u32 rx_bytes = 0;
+ u32 tx_bytes = 0;
+ int i;
+
+ for_each_online_cpu(i) {
+ if (priv->cpu[i]) {
+ rx_packets += priv->cpu[i]->stats.rx_packets;
+ rx_bytes += priv->cpu[i]->stats.rx_bytes;
+ tx_packets += priv->cpu[i]->stats.tx_packets;
+ tx_bytes += priv->cpu[i]->stats.tx_bytes;
+ }
+ }
+
+ priv->stats.rx_packets = rx_packets;
+ priv->stats.rx_bytes = rx_bytes;
+ priv->stats.tx_packets = tx_packets;
+ priv->stats.tx_bytes = tx_bytes;
+
+ return &priv->stats;
+}
+
+
+/*
+ * Change the "mtu".
+ *
+ * The "change_mtu" method is usually not needed.
+ * If you need it, it must be like this.
+ */
+static int tile_net_change_mtu(struct net_device *dev, int new_mtu)
+{
+ PDEBUG("tile_net_change_mtu()\n");
+
+ /* Check ranges. */
+ if ((new_mtu < 68) || (new_mtu > 1500))
+ return -EINVAL;
+
+ /* Accept the value. */
+ dev->mtu = new_mtu;
+
+ return 0;
+}
+
+
+/*
+ * Change the Ethernet Address of the NIC.
+ *
+ * The hypervisor driver does not support changing MAC address. However,
+ * the IPP does not do anything with the MAC address, so the address which
+ * gets used on outgoing packets, and which is accepted on incoming packets,
+ * is completely up to the NetIO program or kernel driver which is actually
+ * handling them.
+ *
+ * Returns 0 on success, negative on failure.
+ */
+static int tile_net_set_mac_address(struct net_device *dev, void *p)
+{
+ struct sockaddr *addr = p;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EINVAL;
+
+ /* ISSUE: Note that "dev_addr" is now a pointer. */
+ memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+ return 0;
+}
+
+
+/*
+ * Obtain the MAC address from the hypervisor.
+ * This must be done before opening the device.
+ */
+static int tile_net_get_mac(struct net_device *dev)
+{
+ struct tile_net_priv *priv = netdev_priv(dev);
+
+ char hv_dev_name[32];
+ int len;
+
+ __netio_getset_offset_t offset = { .word = NETIO_IPP_PARAM_OFF };
+
+ int ret;
+
+ /* For example, "xgbe0". */
+ strcpy(hv_dev_name, dev->name);
+ len = strlen(hv_dev_name);
+
+ /* For example, "xgbe/0". */
+ hv_dev_name[len] = hv_dev_name[len - 1];
+ hv_dev_name[len - 1] = '/';
+ len++;
+
+ /* For example, "xgbe/0/native_hash". */
+ strcpy(hv_dev_name + len, hash_default ? "/native_hash" : "/native");
+
+ /* Get the hypervisor handle for this device. */
+ priv->hv_devhdl = hv_dev_open((HV_VirtAddr)hv_dev_name, 0);
+ PDEBUG("hv_dev_open(%s) returned %d %p\n",
+ hv_dev_name, priv->hv_devhdl, &priv->hv_devhdl);
+ if (priv->hv_devhdl < 0) {
+ if (priv->hv_devhdl == HV_ENODEV)
+ printk(KERN_DEBUG "Ignoring unconfigured device %s\n",
+ hv_dev_name);
+ else
+ printk(KERN_DEBUG "hv_dev_open(%s) returned %d\n",
+ hv_dev_name, priv->hv_devhdl);
+ return -1;
+ }
+
+ /*
+ * Read the hardware address from the hypervisor.
+ * ISSUE: Note that "dev_addr" is now a pointer.
+ */
+ offset.bits.class = NETIO_PARAM;
+ offset.bits.addr = NETIO_PARAM_MAC;
+ ret = hv_dev_pread(priv->hv_devhdl, 0,
+ (HV_VirtAddr)dev->dev_addr, dev->addr_len,
+ offset.word);
+ PDEBUG("hv_dev_pread(NETIO_PARAM_MAC) returned %d\n", ret);
+ if (ret <= 0) {
+ printk(KERN_DEBUG "hv_dev_pread(NETIO_PARAM_MAC) %s failed\n",
+ dev->name);
+ /*
+ * Since the device is configured by the hypervisor but we
+ * can't get its MAC address, we are most likely running
+ * the simulator, so let's generate a random MAC address.
+ */
+ random_ether_addr(dev->dev_addr);
+ }
+
+ return 0;
+}
+
+
+static struct net_device_ops tile_net_ops = {
+ .ndo_open = tile_net_open,
+ .ndo_stop = tile_net_stop,
+ .ndo_start_xmit = tile_net_tx,
+ .ndo_do_ioctl = tile_net_ioctl,
+ .ndo_get_stats = tile_net_get_stats,
+ .ndo_change_mtu = tile_net_change_mtu,
+ .ndo_tx_timeout = tile_net_tx_timeout,
+ .ndo_set_mac_address = tile_net_set_mac_address
+};
+
+
+/*
+ * The setup function.
+ *
+ * This uses ether_setup() to assign various fields in dev, including
+ * setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields.
+ */
+static void tile_net_setup(struct net_device *dev)
+{
+ PDEBUG("tile_net_setup()\n");
+
+ ether_setup(dev);
+
+ dev->netdev_ops = &tile_net_ops;
+
+ dev->watchdog_timeo = TILE_NET_TIMEOUT;
+
+ /* We want lockless xmit. */
+ dev->features |= NETIF_F_LLTX;
+
+ /* We support hardware tx checksums. */
+ dev->features |= NETIF_F_HW_CSUM;
+
+ /* We support scatter/gather. */
+ dev->features |= NETIF_F_SG;
+
+ /* We support TSO. */
+ dev->features |= NETIF_F_TSO;
+
+#ifdef TILE_NET_GSO
+ /* We support GSO. */
+ dev->features |= NETIF_F_GSO;
+#endif
+
+ if (hash_default)
+ dev->features |= NETIF_F_HIGHDMA;
+
+ /* ISSUE: We should support NETIF_F_UFO. */
+
+ dev->tx_queue_len = TILE_NET_TX_QUEUE_LEN;
+
+ dev->mtu = TILE_NET_MTU;
+}
+
+
+/*
+ * Allocate the device structure, register the device, and obtain the
+ * MAC address from the hypervisor.
+ */
+static struct net_device *tile_net_dev_init(const char *name)
+{
+ int ret;
+ struct net_device *dev;
+ struct tile_net_priv *priv;
+
+ /*
+ * Allocate the device structure. This allocates "priv", calls
+ * tile_net_setup(), and saves "name". Normally, "name" is a
+ * template, instantiated by register_netdev(), but not for us.
+ */
+ dev = alloc_netdev(sizeof(*priv), name, tile_net_setup);
+ if (!dev) {
+ pr_err("alloc_netdev(%s) failed\n", name);
+ return NULL;
+ }
+
+ priv = netdev_priv(dev);
+
+ /* Initialize "priv". */
+
+ memset(priv, 0, sizeof(*priv));
+
+ /* Save "dev" for "tile_net_open_retry()". */
+ priv->dev = dev;
+
+ INIT_DELAYED_WORK(&priv->retry_work, tile_net_open_retry);
+
+ spin_lock_init(&priv->eq_lock);
+
+ /* Allocate "eq". */
+ priv->eq_pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, EQ_ORDER);
+ if (!priv->eq_pages) {
+ free_netdev(dev);
+ return NULL;
+ }
+ priv->eq = page_address(priv->eq_pages);
+
+ /* Register the network device. */
+ ret = register_netdev(dev);
+ if (ret) {
+ pr_err("register_netdev %s failed %d\n", dev->name, ret);
+ __free_pages(priv->eq_pages, EQ_ORDER);
+ free_netdev(dev);
+ return NULL;
+ }
+
+ /* Get the MAC address. */
+ ret = tile_net_get_mac(dev);
+ if (ret < 0) {
+ unregister_netdev(dev);
+ __free_pages(priv->eq_pages, EQ_ORDER);
+ free_netdev(dev);
+ return NULL;
+ }
+
+ return dev;
+}
+
+
+/*
+ * Module cleanup.
+ *
+ * FIXME: If compiled as a module, this module cannot be "unloaded",
+ * because the "ingress interrupt handler" is registered permanently.
+ */
+static void tile_net_cleanup(void)
+{
+ int i;
+
+ for (i = 0; i < TILE_NET_DEVS; i++) {
+ if (tile_net_devs[i]) {
+ struct net_device *dev = tile_net_devs[i];
+ struct tile_net_priv *priv = netdev_priv(dev);
+ unregister_netdev(dev);
+ finv_buffer_remote(priv->eq, EQ_SIZE, 0);
+ __free_pages(priv->eq_pages, EQ_ORDER);
+ free_netdev(dev);
+ }
+ }
+}
+
+
+/*
+ * Module initialization.
+ */
+static int tile_net_init_module(void)
+{
+ pr_info("Tilera IPP Net Driver\n");
+
+ tile_net_devs[0] = tile_net_dev_init("xgbe0");
+ tile_net_devs[1] = tile_net_dev_init("xgbe1");
+ tile_net_devs[2] = tile_net_dev_init("gbe0");
+ tile_net_devs[3] = tile_net_dev_init("gbe1");
+
+ return 0;
+}
+
+
+module_init(tile_net_init_module);
+module_exit(tile_net_cleanup);
+
+
+#ifndef MODULE
+
+/*
+ * The "network_cpus" boot argument specifies the cpus that are dedicated
+ * to handle ingress packets.
+ *
+ * The parameter should be in the form "network_cpus=m-n[,x-y]", where
+ * m, n, x, y are integer numbers that represent the cpus that can be
+ * neither a dedicated cpu nor a dataplane cpu.
+ */
+static int __init network_cpus_setup(char *str)
+{
+ int rc = cpulist_parse_crop(str, &network_cpus_map);
+ if (rc != 0) {
+ pr_warning("network_cpus=%s: malformed cpu list\n",
+ str);
+ } else {
+
+ /* Remove dedicated cpus. */
+ cpumask_and(&network_cpus_map, &network_cpus_map,
+ cpu_possible_mask);
+
+
+ if (cpumask_empty(&network_cpus_map)) {
+ pr_warning("Ignoring network_cpus='%s'.\n",
+ str);
+ } else {
+ char buf[1024];
+ cpulist_scnprintf(buf, sizeof(buf), &network_cpus_map);
+ pr_info("Linux network CPUs: %s\n", buf);
+ network_cpus_used = true;
+ }
+ }
+
+ return 0;
+}
+__setup("network_cpus=", network_cpus_setup);
+
+#endif
+++ /dev/null
-#
-# Makefile for the TILE on-chip networking support.
-#
-
-obj-$(CONFIG_TILE_NET) += tile_net.o
-ifdef CONFIG_TILEGX
-tile_net-objs := tilegx.o mpipe.o iorpc_mpipe.o dma_queue.o
-else
-tile_net-objs := tilepro.o
-endif
+++ /dev/null
-/*
- * Copyright 2011 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/moduleparam.h>
-#include <linux/sched.h>
-#include <linux/kernel.h> /* printk() */
-#include <linux/slab.h> /* kmalloc() */
-#include <linux/errno.h> /* error codes */
-#include <linux/types.h> /* size_t */
-#include <linux/interrupt.h>
-#include <linux/in.h>
-#include <linux/netdevice.h> /* struct device, and other headers */
-#include <linux/etherdevice.h> /* eth_type_trans */
-#include <linux/skbuff.h>
-#include <linux/ioctl.h>
-#include <linux/cdev.h>
-#include <linux/hugetlb.h>
-#include <linux/in6.h>
-#include <linux/timer.h>
-#include <linux/io.h>
-#include <asm/checksum.h>
-#include <asm/homecache.h>
-
-#include <hv/drv_xgbe_intf.h>
-#include <hv/drv_xgbe_impl.h>
-#include <hv/hypervisor.h>
-#include <hv/netio_intf.h>
-
-/* For TSO */
-#include <linux/ip.h>
-#include <linux/tcp.h>
-
-
-/*
- * First, "tile_net_init_module()" initializes all four "devices" which
- * can be used by linux.
- *
- * Then, "ifconfig DEVICE up" calls "tile_net_open()", which analyzes
- * the network cpus, then uses "tile_net_open_aux()" to initialize
- * LIPP/LEPP, and then uses "tile_net_open_inner()" to register all
- * the tiles, provide buffers to LIPP, allow ingress to start, and
- * turn on hypervisor interrupt handling (and NAPI) on all tiles.
- *
- * If registration fails due to the link being down, then "retry_work"
- * is used to keep calling "tile_net_open_inner()" until it succeeds.
- *
- * If "ifconfig DEVICE down" is called, it uses "tile_net_stop()" to
- * stop egress, drain the LIPP buffers, unregister all the tiles, stop
- * LIPP/LEPP, and wipe the LEPP queue.
- *
- * We start out with the ingress interrupt enabled on each CPU. When
- * this interrupt fires, we disable it, and call "napi_schedule()".
- * This will cause "tile_net_poll()" to be called, which will pull
- * packets from the netio queue, filtering them out, or passing them
- * to "netif_receive_skb()". If our budget is exhausted, we will
- * return, knowing we will be called again later. Otherwise, we
- * reenable the ingress interrupt, and call "napi_complete()".
- *
- * HACK: Since disabling the ingress interrupt is not reliable, we
- * ignore the interrupt if the global "active" flag is false.
- *
- *
- * NOTE: The use of "native_driver" ensures that EPP exists, and that
- * we are using "LIPP" and "LEPP".
- *
- * NOTE: Failing to free completions for an arbitrarily long time
- * (which is defined to be illegal) does in fact cause bizarre
- * problems. The "egress_timer" helps prevent this from happening.
- */
-
-
-/* HACK: Allow use of "jumbo" packets. */
-/* This should be 1500 if "jumbo" is not set in LIPP. */
-/* This should be at most 10226 (10240 - 14) if "jumbo" is set in LIPP. */
-/* ISSUE: This has not been thoroughly tested (except at 1500). */
-#define TILE_NET_MTU 1500
-
-/* HACK: Define to support GSO. */
-/* ISSUE: This may actually hurt performance of the TCP blaster. */
-/* #define TILE_NET_GSO */
-
-/* Define this to collapse "duplicate" acks. */
-/* #define IGNORE_DUP_ACKS */
-
-/* HACK: Define this to verify incoming packets. */
-/* #define TILE_NET_VERIFY_INGRESS */
-
-/* Use 3000 to enable the Linux Traffic Control (QoS) layer, else 0. */
-#define TILE_NET_TX_QUEUE_LEN 0
-
-/* Define to dump packets (prints out the whole packet on tx and rx). */
-/* #define TILE_NET_DUMP_PACKETS */
-
-/* Define to enable debug spew (all PDEBUG's are enabled). */
-/* #define TILE_NET_DEBUG */
-
-
-/* Define to activate paranoia checks. */
-/* #define TILE_NET_PARANOIA */
-
-/* Default transmit lockup timeout period, in jiffies. */
-#define TILE_NET_TIMEOUT (5 * HZ)
-
-/* Default retry interval for bringing up the NetIO interface, in jiffies. */
-#define TILE_NET_RETRY_INTERVAL (5 * HZ)
-
-/* Number of ports (xgbe0, xgbe1, gbe0, gbe1). */
-#define TILE_NET_DEVS 4
-
-
-
-/* Paranoia. */
-#if NET_IP_ALIGN != LIPP_PACKET_PADDING
-#error "NET_IP_ALIGN must match LIPP_PACKET_PADDING."
-#endif
-
-
-/* Debug print. */
-#ifdef TILE_NET_DEBUG
-#define PDEBUG(fmt, args...) net_printk(fmt, ## args)
-#else
-#define PDEBUG(fmt, args...)
-#endif
-
-
-MODULE_AUTHOR("Tilera");
-MODULE_LICENSE("GPL");
-
-
-/*
- * Queue of incoming packets for a specific cpu and device.
- *
- * Includes a pointer to the "system" data, and the actual "user" data.
- */
-struct tile_netio_queue {
- netio_queue_impl_t *__system_part;
- netio_queue_user_impl_t __user_part;
-
-};
-
-
-/*
- * Statistics counters for a specific cpu and device.
- */
-struct tile_net_stats_t {
- u32 rx_packets;
- u32 rx_bytes;
- u32 tx_packets;
- u32 tx_bytes;
-};
-
-
-/*
- * Info for a specific cpu and device.
- *
- * ISSUE: There is a "dev" pointer in "napi" as well.
- */
-struct tile_net_cpu {
- /* The NAPI struct. */
- struct napi_struct napi;
- /* Packet queue. */
- struct tile_netio_queue queue;
- /* Statistics. */
- struct tile_net_stats_t stats;
- /* True iff NAPI is enabled. */
- bool napi_enabled;
- /* True if this tile has succcessfully registered with the IPP. */
- bool registered;
- /* True if the link was down last time we tried to register. */
- bool link_down;
- /* True if "egress_timer" is scheduled. */
- bool egress_timer_scheduled;
- /* Number of small sk_buffs which must still be provided. */
- unsigned int num_needed_small_buffers;
- /* Number of large sk_buffs which must still be provided. */
- unsigned int num_needed_large_buffers;
- /* A timer for handling egress completions. */
- struct timer_list egress_timer;
-};
-
-
-/*
- * Info for a specific device.
- */
-struct tile_net_priv {
- /* Our network device. */
- struct net_device *dev;
- /* Pages making up the egress queue. */
- struct page *eq_pages;
- /* Address of the actual egress queue. */
- lepp_queue_t *eq;
- /* Protects "eq". */
- spinlock_t eq_lock;
- /* The hypervisor handle for this interface. */
- int hv_devhdl;
- /* The intr bit mask that IDs this device. */
- u32 intr_id;
- /* True iff "tile_net_open_aux()" has succeeded. */
- bool partly_opened;
- /* True iff the device is "active". */
- bool active;
- /* Effective network cpus. */
- struct cpumask network_cpus_map;
- /* Number of network cpus. */
- int network_cpus_count;
- /* Credits per network cpu. */
- int network_cpus_credits;
- /* Network stats. */
- struct net_device_stats stats;
- /* For NetIO bringup retries. */
- struct delayed_work retry_work;
- /* Quick access to per cpu data. */
- struct tile_net_cpu *cpu[NR_CPUS];
-};
-
-/* Log2 of the number of small pages needed for the egress queue. */
-#define EQ_ORDER get_order(sizeof(lepp_queue_t))
-/* Size of the egress queue's pages. */
-#define EQ_SIZE (1 << (PAGE_SHIFT + EQ_ORDER))
-
-/*
- * The actual devices (xgbe0, xgbe1, gbe0, gbe1).
- */
-static struct net_device *tile_net_devs[TILE_NET_DEVS];
-
-/*
- * The "tile_net_cpu" structures for each device.
- */
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe0);
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe1);
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe0);
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe1);
-
-
-/*
- * True if "network_cpus" was specified.
- */
-static bool network_cpus_used;
-
-/*
- * The actual cpus in "network_cpus".
- */
-static struct cpumask network_cpus_map;
-
-
-
-#ifdef TILE_NET_DEBUG
-/*
- * printk with extra stuff.
- *
- * We print the CPU we're running in brackets.
- */
-static void net_printk(char *fmt, ...)
-{
- int i;
- int len;
- va_list args;
- static char buf[256];
-
- len = sprintf(buf, "tile_net[%2.2d]: ", smp_processor_id());
- va_start(args, fmt);
- i = vscnprintf(buf + len, sizeof(buf) - len - 1, fmt, args);
- va_end(args);
- buf[255] = '\0';
- pr_notice(buf);
-}
-#endif
-
-
-#ifdef TILE_NET_DUMP_PACKETS
-/*
- * Dump a packet.
- */
-static void dump_packet(unsigned char *data, unsigned long length, char *s)
-{
- int my_cpu = smp_processor_id();
-
- unsigned long i;
- char buf[128];
-
- static unsigned int count;
-
- pr_info("dump_packet(data %p, length 0x%lx s %s count 0x%x)\n",
- data, length, s, count++);
-
- pr_info("\n");
-
- for (i = 0; i < length; i++) {
- if ((i & 0xf) == 0)
- sprintf(buf, "[%02d] %8.8lx:", my_cpu, i);
- sprintf(buf + strlen(buf), " %2.2x", data[i]);
- if ((i & 0xf) == 0xf || i == length - 1) {
- strcat(buf, "\n");
- pr_info("%s", buf);
- }
- }
-}
-#endif
-
-
-/*
- * Provide support for the __netio_fastio1() swint
- * (see <hv/drv_xgbe_intf.h> for how it is used).
- *
- * The fastio swint2 call may clobber all the caller-saved registers.
- * It rarely clobbers memory, but we allow for the possibility in
- * the signature just to be on the safe side.
- *
- * Also, gcc doesn't seem to allow an input operand to be
- * clobbered, so we fake it with dummy outputs.
- *
- * This function can't be static because of the way it is declared
- * in the netio header.
- */
-inline int __netio_fastio1(u32 fastio_index, u32 arg0)
-{
- long result, clobber_r1, clobber_r10;
- asm volatile("swint2"
- : "=R00" (result),
- "=R01" (clobber_r1), "=R10" (clobber_r10)
- : "R10" (fastio_index), "R01" (arg0)
- : "memory", "r2", "r3", "r4",
- "r5", "r6", "r7", "r8", "r9",
- "r11", "r12", "r13", "r14",
- "r15", "r16", "r17", "r18", "r19",
- "r20", "r21", "r22", "r23", "r24",
- "r25", "r26", "r27", "r28", "r29");
- return result;
-}
-
-
-/*
- * Provide a linux buffer to LIPP.
- */
-static void tile_net_provide_linux_buffer(struct tile_net_cpu *info,
- void *va, bool small)
-{
- struct tile_netio_queue *queue = &info->queue;
-
- /* Convert "va" and "small" to "linux_buffer_t". */
- unsigned int buffer = ((unsigned int)(__pa(va) >> 7) << 1) + small;
-
- __netio_fastio_free_buffer(queue->__user_part.__fastio_index, buffer);
-}
-
-
-/*
- * Provide a linux buffer for LIPP.
- *
- * Note that the ACTUAL allocation for each buffer is a "struct sk_buff",
- * plus a chunk of memory that includes not only the requested bytes, but
- * also NET_SKB_PAD bytes of initial padding, and a "struct skb_shared_info".
- *
- * Note that "struct skb_shared_info" is 88 bytes with 64K pages and
- * 268 bytes with 4K pages (since the frags[] array needs 18 entries).
- *
- * Without jumbo packets, the maximum packet size will be 1536 bytes,
- * and we use 2 bytes (NET_IP_ALIGN) of padding. ISSUE: If we told
- * the hardware to clip at 1518 bytes instead of 1536 bytes, then we
- * could save an entire cache line, but in practice, we don't need it.
- *
- * Since CPAs are 38 bits, and we can only encode the high 31 bits in
- * a "linux_buffer_t", the low 7 bits must be zero, and thus, we must
- * align the actual "va" mod 128.
- *
- * We assume that the underlying "head" will be aligned mod 64. Note
- * that in practice, we have seen "head" NOT aligned mod 128 even when
- * using 2048 byte allocations, which is surprising.
- *
- * If "head" WAS always aligned mod 128, we could change LIPP to
- * assume that the low SIX bits are zero, and the 7th bit is one, that
- * is, align the actual "va" mod 128 plus 64, which would be "free".
- *
- * For now, the actual "head" pointer points at NET_SKB_PAD bytes of
- * padding, plus 28 or 92 bytes of extra padding, plus the sk_buff
- * pointer, plus the NET_IP_ALIGN padding, plus 126 or 1536 bytes for
- * the actual packet, plus 62 bytes of empty padding, plus some
- * padding and the "struct skb_shared_info".
- *
- * With 64K pages, a large buffer thus needs 32+92+4+2+1536+62+88
- * bytes, or 1816 bytes, which fits comfortably into 2048 bytes.
- *
- * With 64K pages, a small buffer thus needs 32+92+4+2+126+88
- * bytes, or 344 bytes, which means we are wasting 64+ bytes, and
- * could presumably increase the size of small buffers.
- *
- * With 4K pages, a large buffer thus needs 32+92+4+2+1536+62+268
- * bytes, or 1996 bytes, which fits comfortably into 2048 bytes.
- *
- * With 4K pages, a small buffer thus needs 32+92+4+2+126+268
- * bytes, or 524 bytes, which is annoyingly wasteful.
- *
- * Maybe we should increase LIPP_SMALL_PACKET_SIZE to 192?
- *
- * ISSUE: Maybe we should increase "NET_SKB_PAD" to 64?
- */
-static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info,
- bool small)
-{
-#if TILE_NET_MTU <= 1536
- /* Without "jumbo", 2 + 1536 should be sufficient. */
- unsigned int large_size = NET_IP_ALIGN + 1536;
-#else
- /* ISSUE: This has not been tested. */
- unsigned int large_size = NET_IP_ALIGN + TILE_NET_MTU + 100;
-#endif
-
- /* Avoid "false sharing" with last cache line. */
- /* ISSUE: This is already done by "dev_alloc_skb()". */
- unsigned int len =
- (((small ? LIPP_SMALL_PACKET_SIZE : large_size) +
- CHIP_L2_LINE_SIZE() - 1) & -CHIP_L2_LINE_SIZE());
-
- unsigned int padding = 128 - NET_SKB_PAD;
- unsigned int align;
-
- struct sk_buff *skb;
- void *va;
-
- struct sk_buff **skb_ptr;
-
- /* Request 96 extra bytes for alignment purposes. */
- skb = dev_alloc_skb(len + padding);
- if (skb == NULL)
- return false;
-
- /* Skip 32 or 96 bytes to align "data" mod 128. */
- align = -(long)skb->data & (128 - 1);
- BUG_ON(align > padding);
- skb_reserve(skb, align);
-
- /* This address is given to IPP. */
- va = skb->data;
-
- /* Buffers must not span a huge page. */
- BUG_ON(((((long)va & ~HPAGE_MASK) + len) & HPAGE_MASK) != 0);
-
-#ifdef TILE_NET_PARANOIA
-#if CHIP_HAS_CBOX_HOME_MAP()
- if (hash_default) {
- HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)va);
- if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
- panic("Non-HFH ingress buffer! VA=%p Mode=%d PTE=%llx",
- va, hv_pte_get_mode(pte), hv_pte_val(pte));
- }
-#endif
-#endif
-
- /* Invalidate the packet buffer. */
- if (!hash_default)
- __inv_buffer(va, len);
-
- /* Skip two bytes to satisfy LIPP assumptions. */
- /* Note that this aligns IP on a 16 byte boundary. */
- /* ISSUE: Do this when the packet arrives? */
- skb_reserve(skb, NET_IP_ALIGN);
-
- /* Save a back-pointer to 'skb'. */
- skb_ptr = va - sizeof(*skb_ptr);
- *skb_ptr = skb;
-
- /* Make sure "skb_ptr" has been flushed. */
- __insn_mf();
-
- /* Provide the new buffer. */
- tile_net_provide_linux_buffer(info, va, small);
-
- return true;
-}
-
-
-/*
- * Provide linux buffers for LIPP.
- */
-static void tile_net_provide_needed_buffers(struct tile_net_cpu *info)
-{
- while (info->num_needed_small_buffers != 0) {
- if (!tile_net_provide_needed_buffer(info, true))
- goto oops;
- info->num_needed_small_buffers--;
- }
-
- while (info->num_needed_large_buffers != 0) {
- if (!tile_net_provide_needed_buffer(info, false))
- goto oops;
- info->num_needed_large_buffers--;
- }
-
- return;
-
-oops:
-
- /* Add a description to the page allocation failure dump. */
- pr_notice("Could not provide a linux buffer to LIPP.\n");
-}
-
-
-/*
- * Grab some LEPP completions, and store them in "comps", of size
- * "comps_size", and return the number of completions which were
- * stored, so the caller can free them.
- */
-static unsigned int tile_net_lepp_grab_comps(lepp_queue_t *eq,
- struct sk_buff *comps[],
- unsigned int comps_size,
- unsigned int min_size)
-{
- unsigned int n = 0;
-
- unsigned int comp_head = eq->comp_head;
- unsigned int comp_busy = eq->comp_busy;
-
- while (comp_head != comp_busy && n < comps_size) {
- comps[n++] = eq->comps[comp_head];
- LEPP_QINC(comp_head);
- }
-
- if (n < min_size)
- return 0;
-
- eq->comp_head = comp_head;
-
- return n;
-}
-
-
-/*
- * Free some comps, and return true iff there are still some pending.
- */
-static bool tile_net_lepp_free_comps(struct net_device *dev, bool all)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- lepp_queue_t *eq = priv->eq;
-
- struct sk_buff *olds[64];
- unsigned int wanted = 64;
- unsigned int i, n;
- bool pending;
-
- spin_lock(&priv->eq_lock);
-
- if (all)
- eq->comp_busy = eq->comp_tail;
-
- n = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
-
- pending = (eq->comp_head != eq->comp_tail);
-
- spin_unlock(&priv->eq_lock);
-
- for (i = 0; i < n; i++)
- kfree_skb(olds[i]);
-
- return pending;
-}
-
-
-/*
- * Make sure the egress timer is scheduled.
- *
- * Note that we use "schedule if not scheduled" logic instead of the more
- * obvious "reschedule" logic, because "reschedule" is fairly expensive.
- */
-static void tile_net_schedule_egress_timer(struct tile_net_cpu *info)
-{
- if (!info->egress_timer_scheduled) {
- mod_timer_pinned(&info->egress_timer, jiffies + 1);
- info->egress_timer_scheduled = true;
- }
-}
-
-
-/*
- * The "function" for "info->egress_timer".
- *
- * This timer will reschedule itself as long as there are any pending
- * completions expected (on behalf of any tile).
- *
- * ISSUE: Realistically, will the timer ever stop scheduling itself?
- *
- * ISSUE: This timer is almost never actually needed, so just use a global
- * timer that can run on any tile.
- *
- * ISSUE: Maybe instead track number of expected completions, and free
- * only that many, resetting to zero if "pending" is ever false.
- */
-static void tile_net_handle_egress_timer(unsigned long arg)
-{
- struct tile_net_cpu *info = (struct tile_net_cpu *)arg;
- struct net_device *dev = info->napi.dev;
-
- /* The timer is no longer scheduled. */
- info->egress_timer_scheduled = false;
-
- /* Free comps, and reschedule timer if more are pending. */
- if (tile_net_lepp_free_comps(dev, false))
- tile_net_schedule_egress_timer(info);
-}
-
-
-#ifdef IGNORE_DUP_ACKS
-
-/*
- * Help detect "duplicate" ACKs. These are sequential packets (for a
- * given flow) which are exactly 66 bytes long, sharing everything but
- * ID=2@0x12, Hsum=2@0x18, Ack=4@0x2a, WinSize=2@0x30, Csum=2@0x32,
- * Tstamps=10@0x38. The ID's are +1, the Hsum's are -1, the Ack's are
- * +N, and the Tstamps are usually identical.
- *
- * NOTE: Apparently truly duplicate acks (with identical "ack" values),
- * should not be collapsed, as they are used for some kind of flow control.
- */
-static bool is_dup_ack(char *s1, char *s2, unsigned int len)
-{
- int i;
-
- unsigned long long ignorable = 0;
-
- /* Identification. */
- ignorable |= (1ULL << 0x12);
- ignorable |= (1ULL << 0x13);
-
- /* Header checksum. */
- ignorable |= (1ULL << 0x18);
- ignorable |= (1ULL << 0x19);
-
- /* ACK. */
- ignorable |= (1ULL << 0x2a);
- ignorable |= (1ULL << 0x2b);
- ignorable |= (1ULL << 0x2c);
- ignorable |= (1ULL << 0x2d);
-
- /* WinSize. */
- ignorable |= (1ULL << 0x30);
- ignorable |= (1ULL << 0x31);
-
- /* Checksum. */
- ignorable |= (1ULL << 0x32);
- ignorable |= (1ULL << 0x33);
-
- for (i = 0; i < len; i++, ignorable >>= 1) {
-
- if ((ignorable & 1) || (s1[i] == s2[i]))
- continue;
-
-#ifdef TILE_NET_DEBUG
- /* HACK: Mention non-timestamp diffs. */
- if (i < 0x38 && i != 0x2f &&
- net_ratelimit())
- pr_info("Diff at 0x%x\n", i);
-#endif
-
- return false;
- }
-
-#ifdef TILE_NET_NO_SUPPRESS_DUP_ACKS
- /* HACK: Do not suppress truly duplicate ACKs. */
- /* ISSUE: Is this actually necessary or helpful? */
- if (s1[0x2a] == s2[0x2a] &&
- s1[0x2b] == s2[0x2b] &&
- s1[0x2c] == s2[0x2c] &&
- s1[0x2d] == s2[0x2d]) {
- return false;
- }
-#endif
-
- return true;
-}
-
-#endif
-
-
-
-static void tile_net_discard_aux(struct tile_net_cpu *info, int index)
-{
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- int index2_aux = index + sizeof(netio_pkt_t);
- int index2 =
- ((index2_aux ==
- qsp->__packet_receive_queue.__last_packet_plus_one) ?
- 0 : index2_aux);
-
- netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
-
- /* Extract the "linux_buffer_t". */
- unsigned int buffer = pkt->__packet.word;
-
- /* Convert "linux_buffer_t" to "va". */
- void *va = __va((phys_addr_t)(buffer >> 1) << 7);
-
- /* Acquire the associated "skb". */
- struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
- struct sk_buff *skb = *skb_ptr;
-
- kfree_skb(skb);
-
- /* Consume this packet. */
- qup->__packet_receive_read = index2;
-}
-
-
-/*
- * Like "tile_net_poll()", but just discard packets.
- */
-static void tile_net_discard_packets(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- while (qup->__packet_receive_read !=
- qsp->__packet_receive_queue.__packet_write) {
- int index = qup->__packet_receive_read;
- tile_net_discard_aux(info, index);
- }
-}
-
-
-/*
- * Handle the next packet. Return true if "processed", false if "filtered".
- */
-static bool tile_net_poll_aux(struct tile_net_cpu *info, int index)
-{
- struct net_device *dev = info->napi.dev;
-
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
- struct tile_net_stats_t *stats = &info->stats;
-
- int filter;
-
- int index2_aux = index + sizeof(netio_pkt_t);
- int index2 =
- ((index2_aux ==
- qsp->__packet_receive_queue.__last_packet_plus_one) ?
- 0 : index2_aux);
-
- netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
-
- netio_pkt_metadata_t *metadata = NETIO_PKT_METADATA(pkt);
-
- /* Extract the packet size. FIXME: Shouldn't the second line */
- /* get subtracted? Mostly moot, since it should be "zero". */
- unsigned long len =
- (NETIO_PKT_CUSTOM_LENGTH(pkt) +
- NET_IP_ALIGN - NETIO_PACKET_PADDING);
-
- /* Extract the "linux_buffer_t". */
- unsigned int buffer = pkt->__packet.word;
-
- /* Extract "small" (vs "large"). */
- bool small = ((buffer & 1) != 0);
-
- /* Convert "linux_buffer_t" to "va". */
- void *va = __va((phys_addr_t)(buffer >> 1) << 7);
-
- /* Extract the packet data pointer. */
- /* Compare to "NETIO_PKT_CUSTOM_DATA(pkt)". */
- unsigned char *buf = va + NET_IP_ALIGN;
-
- /* Invalidate the packet buffer. */
- if (!hash_default)
- __inv_buffer(buf, len);
-
- /* ISSUE: Is this needed? */
- dev->last_rx = jiffies;
-
-#ifdef TILE_NET_DUMP_PACKETS
- dump_packet(buf, len, "rx");
-#endif /* TILE_NET_DUMP_PACKETS */
-
-#ifdef TILE_NET_VERIFY_INGRESS
- if (!NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt) &&
- NETIO_PKT_L4_CSUM_CALCULATED_M(metadata, pkt)) {
- /* Bug 6624: Includes UDP packets with a "zero" checksum. */
- pr_warning("Bad L4 checksum on %d byte packet.\n", len);
- }
- if (!NETIO_PKT_L3_CSUM_CORRECT_M(metadata, pkt) &&
- NETIO_PKT_L3_CSUM_CALCULATED_M(metadata, pkt)) {
- dump_packet(buf, len, "rx");
- panic("Bad L3 checksum.");
- }
- switch (NETIO_PKT_STATUS_M(metadata, pkt)) {
- case NETIO_PKT_STATUS_OVERSIZE:
- if (len >= 64) {
- dump_packet(buf, len, "rx");
- panic("Unexpected OVERSIZE.");
- }
- break;
- case NETIO_PKT_STATUS_BAD:
- pr_warning("Unexpected BAD %ld byte packet.\n", len);
- }
-#endif
-
- filter = 0;
-
- /* ISSUE: Filter TCP packets with "bad" checksums? */
-
- if (!(dev->flags & IFF_UP)) {
- /* Filter packets received before we're up. */
- filter = 1;
- } else if (NETIO_PKT_STATUS_M(metadata, pkt) == NETIO_PKT_STATUS_BAD) {
- /* Filter "truncated" packets. */
- filter = 1;
- } else if (!(dev->flags & IFF_PROMISC)) {
- /* FIXME: Implement HW multicast filter. */
- if (!is_multicast_ether_addr(buf)) {
- /* Filter packets not for our address. */
- const u8 *mine = dev->dev_addr;
- filter = compare_ether_addr(mine, buf);
- }
- }
-
- if (filter) {
-
- /* ISSUE: Update "drop" statistics? */
-
- tile_net_provide_linux_buffer(info, va, small);
-
- } else {
-
- /* Acquire the associated "skb". */
- struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
- struct sk_buff *skb = *skb_ptr;
-
- /* Paranoia. */
- if (skb->data != buf)
- panic("Corrupt linux buffer from LIPP! "
- "VA=%p, skb=%p, skb->data=%p\n",
- va, skb, skb->data);
-
- /* Encode the actual packet length. */
- skb_put(skb, len);
-
- /* NOTE: This call also sets "skb->dev = dev". */
- skb->protocol = eth_type_trans(skb, dev);
-
- /* Avoid recomputing "good" TCP/UDP checksums. */
- if (NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt))
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- netif_receive_skb(skb);
-
- stats->rx_packets++;
- stats->rx_bytes += len;
-
- if (small)
- info->num_needed_small_buffers++;
- else
- info->num_needed_large_buffers++;
- }
-
- /* Return four credits after every fourth packet. */
- if (--qup->__receive_credit_remaining == 0) {
- u32 interval = qup->__receive_credit_interval;
- qup->__receive_credit_remaining = interval;
- __netio_fastio_return_credits(qup->__fastio_index, interval);
- }
-
- /* Consume this packet. */
- qup->__packet_receive_read = index2;
-
- return !filter;
-}
-
-
-/*
- * Handle some packets for the given device on the current CPU.
- *
- * If "tile_net_stop()" is called on some other tile while this
- * function is running, we will return, hopefully before that
- * other tile asks us to call "napi_disable()".
- *
- * The "rotting packet" race condition occurs if a packet arrives
- * during the extremely narrow window between the queue appearing to
- * be empty, and the ingress interrupt being re-enabled. This happens
- * a LOT under heavy network load.
- */
-static int tile_net_poll(struct napi_struct *napi, int budget)
-{
- struct net_device *dev = napi->dev;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- unsigned int work = 0;
-
- while (priv->active) {
- int index = qup->__packet_receive_read;
- if (index == qsp->__packet_receive_queue.__packet_write)
- break;
-
- if (tile_net_poll_aux(info, index)) {
- if (++work >= budget)
- goto done;
- }
- }
-
- napi_complete(&info->napi);
-
- if (!priv->active)
- goto done;
-
- /* Re-enable the ingress interrupt. */
- enable_percpu_irq(priv->intr_id);
-
- /* HACK: Avoid the "rotting packet" problem (see above). */
- if (qup->__packet_receive_read !=
- qsp->__packet_receive_queue.__packet_write) {
- /* ISSUE: Sometimes this returns zero, presumably */
- /* because an interrupt was handled for this tile. */
- (void)napi_reschedule(&info->napi);
- }
-
-done:
-
- if (priv->active)
- tile_net_provide_needed_buffers(info);
-
- return work;
-}
-
-
-/*
- * Handle an ingress interrupt for the given device on the current cpu.
- *
- * ISSUE: Sometimes this gets called after "disable_percpu_irq()" has
- * been called! This is probably due to "pending hypervisor downcalls".
- *
- * ISSUE: Is there any race condition between the "napi_schedule()" here
- * and the "napi_complete()" call above?
- */
-static irqreturn_t tile_net_handle_ingress_interrupt(int irq, void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Disable the ingress interrupt. */
- disable_percpu_irq(priv->intr_id);
-
- /* Ignore unwanted interrupts. */
- if (!priv->active)
- return IRQ_HANDLED;
-
- /* ISSUE: Sometimes "info->napi_enabled" is false here. */
-
- napi_schedule(&info->napi);
-
- return IRQ_HANDLED;
-}
-
-
-/*
- * One time initialization per interface.
- */
-static int tile_net_open_aux(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- int ret;
- int dummy;
- unsigned int epp_lotar;
-
- /*
- * Find out where EPP memory should be homed.
- */
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)&epp_lotar, sizeof(epp_lotar),
- NETIO_EPP_SHM_OFF);
- if (ret < 0) {
- pr_err("could not read epp_shm_queue lotar.\n");
- return -EIO;
- }
-
- /*
- * Home the page on the EPP.
- */
- {
- int epp_home = hv_lotar_to_cpu(epp_lotar);
- homecache_change_page_home(priv->eq_pages, EQ_ORDER, epp_home);
- }
-
- /*
- * Register the EPP shared memory queue.
- */
- {
- netio_ipp_address_t ea = {
- .va = 0,
- .pa = __pa(priv->eq),
- .pte = hv_pte(0),
- .size = EQ_SIZE,
- };
- ea.pte = hv_pte_set_lotar(ea.pte, epp_lotar);
- ea.pte = hv_pte_set_mode(ea.pte, HV_PTE_MODE_CACHE_TILE_L3);
- ret = hv_dev_pwrite(priv->hv_devhdl, 0,
- (HV_VirtAddr)&ea,
- sizeof(ea),
- NETIO_EPP_SHM_OFF);
- if (ret < 0)
- return -EIO;
- }
-
- /*
- * Start LIPP/LEPP.
- */
- if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_START_SHIM_OFF) < 0) {
- pr_warning("Failed to start LIPP/LEPP.\n");
- return -EIO;
- }
-
- return 0;
-}
-
-
-/*
- * Register with hypervisor on the current CPU.
- *
- * Strangely, this function does important things even if it "fails",
- * which is especially common if the link is not up yet. Hopefully
- * these things are all "harmless" if done twice!
- */
-static void tile_net_register(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info;
-
- struct tile_netio_queue *queue;
-
- /* Only network cpus can receive packets. */
- int queue_id =
- cpumask_test_cpu(my_cpu, &priv->network_cpus_map) ? 0 : 255;
-
- netio_input_config_t config = {
- .flags = 0,
- .num_receive_packets = priv->network_cpus_credits,
- .queue_id = queue_id
- };
-
- int ret = 0;
- netio_queue_impl_t *queuep;
-
- PDEBUG("tile_net_register(queue_id %d)\n", queue_id);
-
- if (!strcmp(dev->name, "xgbe0"))
- info = &__get_cpu_var(hv_xgbe0);
- else if (!strcmp(dev->name, "xgbe1"))
- info = &__get_cpu_var(hv_xgbe1);
- else if (!strcmp(dev->name, "gbe0"))
- info = &__get_cpu_var(hv_gbe0);
- else if (!strcmp(dev->name, "gbe1"))
- info = &__get_cpu_var(hv_gbe1);
- else
- BUG();
-
- /* Initialize the egress timer. */
- init_timer(&info->egress_timer);
- info->egress_timer.data = (long)info;
- info->egress_timer.function = tile_net_handle_egress_timer;
-
- priv->cpu[my_cpu] = info;
-
- /*
- * Register ourselves with LIPP. This does a lot of stuff,
- * including invoking the LIPP registration code.
- */
- ret = hv_dev_pwrite(priv->hv_devhdl, 0,
- (HV_VirtAddr)&config,
- sizeof(netio_input_config_t),
- NETIO_IPP_INPUT_REGISTER_OFF);
- PDEBUG("hv_dev_pwrite(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
- ret);
- if (ret < 0) {
- if (ret != NETIO_LINK_DOWN) {
- printk(KERN_DEBUG "hv_dev_pwrite "
- "NETIO_IPP_INPUT_REGISTER_OFF failure %d\n",
- ret);
- }
- info->link_down = (ret == NETIO_LINK_DOWN);
- return;
- }
-
- /*
- * Get the pointer to our queue's system part.
- */
-
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)&queuep,
- sizeof(netio_queue_impl_t *),
- NETIO_IPP_INPUT_REGISTER_OFF);
- PDEBUG("hv_dev_pread(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
- ret);
- PDEBUG("queuep %p\n", queuep);
- if (ret <= 0) {
- /* ISSUE: Shouldn't this be a fatal error? */
- pr_err("hv_dev_pread NETIO_IPP_INPUT_REGISTER_OFF failure\n");
- return;
- }
-
- queue = &info->queue;
-
- queue->__system_part = queuep;
-
- memset(&queue->__user_part, 0, sizeof(netio_queue_user_impl_t));
-
- /* This is traditionally "config.num_receive_packets / 2". */
- queue->__user_part.__receive_credit_interval = 4;
- queue->__user_part.__receive_credit_remaining =
- queue->__user_part.__receive_credit_interval;
-
- /*
- * Get a fastio index from the hypervisor.
- * ISSUE: Shouldn't this check the result?
- */
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)&queue->__user_part.__fastio_index,
- sizeof(queue->__user_part.__fastio_index),
- NETIO_IPP_GET_FASTIO_OFF);
- PDEBUG("hv_dev_pread(NETIO_IPP_GET_FASTIO_OFF) returned %d\n", ret);
-
- /* Now we are registered. */
- info->registered = true;
-}
-
-
-/*
- * Deregister with hypervisor on the current CPU.
- *
- * This simply discards all our credits, so no more packets will be
- * delivered to this tile. There may still be packets in our queue.
- *
- * Also, disable the ingress interrupt.
- */
-static void tile_net_deregister(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Disable the ingress interrupt. */
- disable_percpu_irq(priv->intr_id);
-
- /* Do nothing else if not registered. */
- if (info == NULL || !info->registered)
- return;
-
- {
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- /* Discard all our credits. */
- __netio_fastio_return_credits(qup->__fastio_index, -1);
- }
-}
-
-
-/*
- * Unregister with hypervisor on the current CPU.
- *
- * Also, disable the ingress interrupt.
- */
-static void tile_net_unregister(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- int ret;
- int dummy = 0;
-
- /* Disable the ingress interrupt. */
- disable_percpu_irq(priv->intr_id);
-
- /* Do nothing else if not registered. */
- if (info == NULL || !info->registered)
- return;
-
- /* Unregister ourselves with LIPP/LEPP. */
- ret = hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_INPUT_UNREGISTER_OFF);
- if (ret < 0)
- panic("Failed to unregister with LIPP/LEPP!\n");
-
- /* Discard all packets still in our NetIO queue. */
- tile_net_discard_packets(dev);
-
- /* Reset state. */
- info->num_needed_small_buffers = 0;
- info->num_needed_large_buffers = 0;
-
- /* Cancel egress timer. */
- del_timer(&info->egress_timer);
- info->egress_timer_scheduled = false;
-}
-
-
-/*
- * Helper function for "tile_net_stop()".
- *
- * Also used to handle registration failure in "tile_net_open_inner()",
- * when the various extra steps in "tile_net_stop()" are not necessary.
- */
-static void tile_net_stop_aux(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int i;
-
- int dummy = 0;
-
- /*
- * Unregister all tiles, so LIPP will stop delivering packets.
- * Also, delete all the "napi" objects (sequentially, to protect
- * "dev->napi_list").
- */
- on_each_cpu(tile_net_unregister, (void *)dev, 1);
- for_each_online_cpu(i) {
- struct tile_net_cpu *info = priv->cpu[i];
- if (info != NULL && info->registered) {
- netif_napi_del(&info->napi);
- info->registered = false;
- }
- }
-
- /* Stop LIPP/LEPP. */
- if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_STOP_SHIM_OFF) < 0)
- panic("Failed to stop LIPP/LEPP!\n");
-
- priv->partly_opened = 0;
-}
-
-
-/*
- * Disable NAPI for the given device on the current cpu.
- */
-static void tile_net_stop_disable(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Disable NAPI if needed. */
- if (info != NULL && info->napi_enabled) {
- napi_disable(&info->napi);
- info->napi_enabled = false;
- }
-}
-
-
-/*
- * Enable NAPI and the ingress interrupt for the given device
- * on the current cpu.
- *
- * ISSUE: Only do this for "network cpus"?
- */
-static void tile_net_open_enable(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Enable NAPI. */
- napi_enable(&info->napi);
- info->napi_enabled = true;
-
- /* Enable the ingress interrupt. */
- enable_percpu_irq(priv->intr_id);
-}
-
-
-/*
- * tile_net_open_inner does most of the work of bringing up the interface.
- * It's called from tile_net_open(), and also from tile_net_retry_open().
- * The return value is 0 if the interface was brought up, < 0 if
- * tile_net_open() should return the return value as an error, and > 0 if
- * tile_net_open() should return success and schedule a work item to
- * periodically retry the bringup.
- */
-static int tile_net_open_inner(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info;
- struct tile_netio_queue *queue;
- int result = 0;
- int i;
- int dummy = 0;
-
- /*
- * First try to register just on the local CPU, and handle any
- * semi-expected "link down" failure specially. Note that we
- * do NOT call "tile_net_stop_aux()", unlike below.
- */
- tile_net_register(dev);
- info = priv->cpu[my_cpu];
- if (!info->registered) {
- if (info->link_down)
- return 1;
- return -EAGAIN;
- }
-
- /*
- * Now register everywhere else. If any registration fails,
- * even for "link down" (which might not be possible), we
- * clean up using "tile_net_stop_aux()". Also, add all the
- * "napi" objects (sequentially, to protect "dev->napi_list").
- * ISSUE: Only use "netif_napi_add()" for "network cpus"?
- */
- smp_call_function(tile_net_register, (void *)dev, 1);
- for_each_online_cpu(i) {
- struct tile_net_cpu *info = priv->cpu[i];
- if (info->registered)
- netif_napi_add(dev, &info->napi, tile_net_poll, 64);
- else
- result = -EAGAIN;
- }
- if (result != 0) {
- tile_net_stop_aux(dev);
- return result;
- }
-
- queue = &info->queue;
-
- if (priv->intr_id == 0) {
- unsigned int irq;
-
- /*
- * Acquire the irq allocated by the hypervisor. Every
- * queue gets the same irq. The "__intr_id" field is
- * "1 << irq", so we use "__ffs()" to extract "irq".
- */
- priv->intr_id = queue->__system_part->__intr_id;
- BUG_ON(priv->intr_id == 0);
- irq = __ffs(priv->intr_id);
-
- /*
- * Register the ingress interrupt handler for this
- * device, permanently.
- *
- * We used to call "free_irq()" in "tile_net_stop()",
- * and then re-register the handler here every time,
- * but that caused DNP errors in "handle_IRQ_event()"
- * because "desc->action" was NULL. See bug 9143.
- */
- tile_irq_activate(irq, TILE_IRQ_PERCPU);
- BUG_ON(request_irq(irq, tile_net_handle_ingress_interrupt,
- 0, dev->name, (void *)dev) != 0);
- }
-
- {
- /* Allocate initial buffers. */
-
- int max_buffers =
- priv->network_cpus_count * priv->network_cpus_credits;
-
- info->num_needed_small_buffers =
- min(LIPP_SMALL_BUFFERS, max_buffers);
-
- info->num_needed_large_buffers =
- min(LIPP_LARGE_BUFFERS, max_buffers);
-
- tile_net_provide_needed_buffers(info);
-
- if (info->num_needed_small_buffers != 0 ||
- info->num_needed_large_buffers != 0)
- panic("Insufficient memory for buffer stack!");
- }
-
- /* We are about to be active. */
- priv->active = true;
-
- /* Make sure "active" is visible to all tiles. */
- mb();
-
- /* On each tile, enable NAPI and the ingress interrupt. */
- on_each_cpu(tile_net_open_enable, (void *)dev, 1);
-
- /* Start LIPP/LEPP and activate "ingress" at the shim. */
- if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_INPUT_INIT_OFF) < 0)
- panic("Failed to activate the LIPP Shim!\n");
-
- /* Start our transmit queue. */
- netif_start_queue(dev);
-
- return 0;
-}
-
-
-/*
- * Called periodically to retry bringing up the NetIO interface,
- * if it doesn't come up cleanly during tile_net_open().
- */
-static void tile_net_open_retry(struct work_struct *w)
-{
- struct delayed_work *dw =
- container_of(w, struct delayed_work, work);
-
- struct tile_net_priv *priv =
- container_of(dw, struct tile_net_priv, retry_work);
-
- /*
- * Try to bring the NetIO interface up. If it fails, reschedule
- * ourselves to try again later; otherwise, tell Linux we now have
- * a working link. ISSUE: What if the return value is negative?
- */
- if (tile_net_open_inner(priv->dev) != 0)
- schedule_delayed_work(&priv->retry_work,
- TILE_NET_RETRY_INTERVAL);
- else
- netif_carrier_on(priv->dev);
-}
-
-
-/*
- * Called when a network interface is made active.
- *
- * Returns 0 on success, negative value on failure.
- *
- * The open entry point is called when a network interface is made
- * active by the system (IFF_UP). At this point all resources needed
- * for transmit and receive operations are allocated, the interrupt
- * handler is registered with the OS (if needed), the watchdog timer
- * is started, and the stack is notified that the interface is ready.
- *
- * If the actual link is not available yet, then we tell Linux that
- * we have no carrier, and we keep checking until the link comes up.
- */
-static int tile_net_open(struct net_device *dev)
-{
- int ret = 0;
- struct tile_net_priv *priv = netdev_priv(dev);
-
- /*
- * We rely on priv->partly_opened to tell us if this is the
- * first time this interface is being brought up. If it is
- * set, the IPP was already initialized and should not be
- * initialized again.
- */
- if (!priv->partly_opened) {
-
- int count;
- int credits;
-
- /* Initialize LIPP/LEPP, and start the Shim. */
- ret = tile_net_open_aux(dev);
- if (ret < 0) {
- pr_err("tile_net_open_aux failed: %d\n", ret);
- return ret;
- }
-
- /* Analyze the network cpus. */
-
- if (network_cpus_used)
- cpumask_copy(&priv->network_cpus_map,
- &network_cpus_map);
- else
- cpumask_copy(&priv->network_cpus_map, cpu_online_mask);
-
-
- count = cpumask_weight(&priv->network_cpus_map);
-
- /* Limit credits to available buffers, and apply min. */
- credits = max(16, (LIPP_LARGE_BUFFERS / count) & ~1);
-
- /* Apply "GBE" max limit. */
- /* ISSUE: Use higher limit for XGBE? */
- credits = min(NETIO_MAX_RECEIVE_PKTS, credits);
-
- priv->network_cpus_count = count;
- priv->network_cpus_credits = credits;
-
-#ifdef TILE_NET_DEBUG
- pr_info("Using %d network cpus, with %d credits each\n",
- priv->network_cpus_count, priv->network_cpus_credits);
-#endif
-
- priv->partly_opened = 1;
-
- } else {
- /* FIXME: Is this possible? */
- /* printk("Already partly opened.\n"); */
- }
-
- /*
- * Attempt to bring up the link.
- */
- ret = tile_net_open_inner(dev);
- if (ret <= 0) {
- if (ret == 0)
- netif_carrier_on(dev);
- return ret;
- }
-
- /*
- * We were unable to bring up the NetIO interface, but we want to
- * try again in a little bit. Tell Linux that we have no carrier
- * so it doesn't try to use the interface before the link comes up
- * and then remember to try again later.
- */
- netif_carrier_off(dev);
- schedule_delayed_work(&priv->retry_work, TILE_NET_RETRY_INTERVAL);
-
- return 0;
-}
-
-
-static int tile_net_drain_lipp_buffers(struct tile_net_priv *priv)
-{
- int n = 0;
-
- /* Drain all the LIPP buffers. */
- while (true) {
- int buffer;
-
- /* NOTE: This should never fail. */
- if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&buffer,
- sizeof(buffer), NETIO_IPP_DRAIN_OFF) < 0)
- break;
-
- /* Stop when done. */
- if (buffer == 0)
- break;
-
- {
- /* Convert "linux_buffer_t" to "va". */
- void *va = __va((phys_addr_t)(buffer >> 1) << 7);
-
- /* Acquire the associated "skb". */
- struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
- struct sk_buff *skb = *skb_ptr;
-
- kfree_skb(skb);
- }
-
- n++;
- }
-
- return n;
-}
-
-
-/*
- * Disables a network interface.
- *
- * Returns 0, this is not allowed to fail.
- *
- * The close entry point is called when an interface is de-activated
- * by the OS. The hardware is still under the drivers control, but
- * needs to be disabled. A global MAC reset is issued to stop the
- * hardware, and all transmit and receive resources are freed.
- *
- * ISSUE: How closely does "netif_running(dev)" mirror "priv->active"?
- *
- * Before we are called by "__dev_close()", "netif_running()" will
- * have been cleared, so no NEW calls to "tile_net_poll()" will be
- * made by "netpoll_poll_dev()".
- *
- * Often, this can cause some tiles to still have packets in their
- * queues, so we must call "tile_net_discard_packets()" later.
- *
- * Note that some other tile may still be INSIDE "tile_net_poll()",
- * and in fact, many will be, if there is heavy network load.
- *
- * Calling "on_each_cpu(tile_net_stop_disable, (void *)dev, 1)" when
- * any tile is still "napi_schedule()"'d will induce a horrible crash
- * when "msleep()" is called. This includes tiles which are inside
- * "tile_net_poll()" which have not yet called "napi_complete()".
- *
- * So, we must first try to wait long enough for other tiles to finish
- * with any current "tile_net_poll()" call, and, hopefully, to clear
- * the "scheduled" flag. ISSUE: It is unclear what happens to tiles
- * which have called "napi_schedule()" but which had not yet tried to
- * call "tile_net_poll()", or which exhausted their budget inside
- * "tile_net_poll()" just before this function was called.
- */
-static int tile_net_stop(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- PDEBUG("tile_net_stop()\n");
-
- /* Start discarding packets. */
- priv->active = false;
-
- /* Make sure "active" is visible to all tiles. */
- mb();
-
- /*
- * On each tile, make sure no NEW packets get delivered, and
- * disable the ingress interrupt.
- *
- * Note that the ingress interrupt can fire AFTER this,
- * presumably due to packets which were recently delivered,
- * but it will have no effect.
- */
- on_each_cpu(tile_net_deregister, (void *)dev, 1);
-
- /* Optimistically drain LIPP buffers. */
- (void)tile_net_drain_lipp_buffers(priv);
-
- /* ISSUE: Only needed if not yet fully open. */
- cancel_delayed_work_sync(&priv->retry_work);
-
- /* Can't transmit any more. */
- netif_stop_queue(dev);
-
- /* Disable NAPI on each tile. */
- on_each_cpu(tile_net_stop_disable, (void *)dev, 1);
-
- /*
- * Drain any remaining LIPP buffers. NOTE: This "printk()"
- * has never been observed, but in theory it could happen.
- */
- if (tile_net_drain_lipp_buffers(priv) != 0)
- printk("Had to drain some extra LIPP buffers!\n");
-
- /* Stop LIPP/LEPP. */
- tile_net_stop_aux(dev);
-
- /*
- * ISSUE: It appears that, in practice anyway, by the time we
- * get here, there are no pending completions, but just in case,
- * we free (all of) them anyway.
- */
- while (tile_net_lepp_free_comps(dev, true))
- /* loop */;
-
- /* Wipe the EPP queue, and wait till the stores hit the EPP. */
- memset(priv->eq, 0, sizeof(lepp_queue_t));
- mb();
-
- return 0;
-}
-
-
-/*
- * Prepare the "frags" info for the resulting LEPP command.
- *
- * If needed, flush the memory used by the frags.
- */
-static unsigned int tile_net_tx_frags(lepp_frag_t *frags,
- struct sk_buff *skb,
- void *b_data, unsigned int b_len)
-{
- unsigned int i, n = 0;
-
- struct skb_shared_info *sh = skb_shinfo(skb);
-
- phys_addr_t cpa;
-
- if (b_len != 0) {
-
- if (!hash_default)
- finv_buffer_remote(b_data, b_len, 0);
-
- cpa = __pa(b_data);
- frags[n].cpa_lo = cpa;
- frags[n].cpa_hi = cpa >> 32;
- frags[n].length = b_len;
- frags[n].hash_for_home = hash_default;
- n++;
- }
-
- for (i = 0; i < sh->nr_frags; i++) {
-
- skb_frag_t *f = &sh->frags[i];
- unsigned long pfn = page_to_pfn(f->page);
-
- /* FIXME: Compute "hash_for_home" properly. */
- /* ISSUE: The hypervisor checks CHIP_HAS_REV1_DMA_PACKETS(). */
- int hash_for_home = hash_default;
-
- /* FIXME: Hmmm. */
- if (!hash_default) {
- void *va = pfn_to_kaddr(pfn) + f->page_offset;
- BUG_ON(PageHighMem(f->page));
- finv_buffer_remote(va, f->size, 0);
- }
-
- cpa = ((phys_addr_t)pfn << PAGE_SHIFT) + f->page_offset;
- frags[n].cpa_lo = cpa;
- frags[n].cpa_hi = cpa >> 32;
- frags[n].length = f->size;
- frags[n].hash_for_home = hash_for_home;
- n++;
- }
-
- return n;
-}
-
-
-/*
- * This function takes "skb", consisting of a header template and a
- * payload, and hands it to LEPP, to emit as one or more segments,
- * each consisting of a possibly modified header, plus a piece of the
- * payload, via a process known as "tcp segmentation offload".
- *
- * Usually, "data" will contain the header template, of size "sh_len",
- * and "sh->frags" will contain "skb->data_len" bytes of payload, and
- * there will be "sh->gso_segs" segments.
- *
- * Sometimes, if "sendfile()" requires copying, we will be called with
- * "data" containing the header and payload, with "frags" being empty.
- *
- * In theory, "sh->nr_frags" could be 3, but in practice, it seems
- * that this will never actually happen.
- *
- * See "emulate_large_send_offload()" for some reference code, which
- * does not handle checksumming.
- *
- * ISSUE: How do we make sure that high memory DMA does not migrate?
- */
-static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_net_stats_t *stats = &info->stats;
-
- struct skb_shared_info *sh = skb_shinfo(skb);
-
- unsigned char *data = skb->data;
-
- /* The ip header follows the ethernet header. */
- struct iphdr *ih = ip_hdr(skb);
- unsigned int ih_len = ih->ihl * 4;
-
- /* Note that "nh == ih", by definition. */
- unsigned char *nh = skb_network_header(skb);
- unsigned int eh_len = nh - data;
-
- /* The tcp header follows the ip header. */
- struct tcphdr *th = (struct tcphdr *)(nh + ih_len);
- unsigned int th_len = th->doff * 4;
-
- /* The total number of header bytes. */
- /* NOTE: This may be less than skb_headlen(skb). */
- unsigned int sh_len = eh_len + ih_len + th_len;
-
- /* The number of payload bytes at "skb->data + sh_len". */
- /* This is non-zero for sendfile() without HIGHDMA. */
- unsigned int b_len = skb_headlen(skb) - sh_len;
-
- /* The total number of payload bytes. */
- unsigned int d_len = b_len + skb->data_len;
-
- /* The maximum payload size. */
- unsigned int p_len = sh->gso_size;
-
- /* The total number of segments. */
- unsigned int num_segs = sh->gso_segs;
-
- /* The temporary copy of the command. */
- u32 cmd_body[(LEPP_MAX_CMD_SIZE + 3) / 4];
- lepp_tso_cmd_t *cmd = (lepp_tso_cmd_t *)cmd_body;
-
- /* Analyze the "frags". */
- unsigned int num_frags =
- tile_net_tx_frags(cmd->frags, skb, data + sh_len, b_len);
-
- /* The size of the command, including frags and header. */
- size_t cmd_size = LEPP_TSO_CMD_SIZE(num_frags, sh_len);
-
- /* The command header. */
- lepp_tso_cmd_t cmd_init = {
- .tso = true,
- .header_size = sh_len,
- .ip_offset = eh_len,
- .tcp_offset = eh_len + ih_len,
- .payload_size = p_len,
- .num_frags = num_frags,
- };
-
- unsigned long irqflags;
-
- lepp_queue_t *eq = priv->eq;
-
- struct sk_buff *olds[8];
- unsigned int wanted = 8;
- unsigned int i, nolds = 0;
-
- unsigned int cmd_head, cmd_tail, cmd_next;
- unsigned int comp_tail;
-
-
- /* Paranoia. */
- BUG_ON(skb->protocol != htons(ETH_P_IP));
- BUG_ON(ih->protocol != IPPROTO_TCP);
- BUG_ON(skb->ip_summed != CHECKSUM_PARTIAL);
- BUG_ON(num_frags > LEPP_MAX_FRAGS);
- /*--BUG_ON(num_segs != (d_len + (p_len - 1)) / p_len); */
- BUG_ON(num_segs <= 1);
-
-
- /* Finish preparing the command. */
-
- /* Copy the command header. */
- *cmd = cmd_init;
-
- /* Copy the "header". */
- memcpy(&cmd->frags[num_frags], data, sh_len);
-
-
- /* Prefetch and wait, to minimize time spent holding the spinlock. */
- prefetch_L1(&eq->comp_tail);
- prefetch_L1(&eq->cmd_tail);
- mb();
-
-
- /* Enqueue the command. */
-
- spin_lock_irqsave(&priv->eq_lock, irqflags);
-
- /*
- * Handle completions if needed to make room.
- * HACK: Spin until there is sufficient room.
- */
- if (lepp_num_free_comp_slots(eq) == 0) {
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
- if (nolds == 0) {
-busy:
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
- return NETDEV_TX_BUSY;
- }
- }
-
- cmd_head = eq->cmd_head;
- cmd_tail = eq->cmd_tail;
-
- /* Prepare to advance, detecting full queue. */
- cmd_next = cmd_tail + cmd_size;
- if (cmd_tail < cmd_head && cmd_next >= cmd_head)
- goto busy;
- if (cmd_next > LEPP_CMD_LIMIT) {
- cmd_next = 0;
- if (cmd_next == cmd_head)
- goto busy;
- }
-
- /* Copy the command. */
- memcpy(&eq->cmds[cmd_tail], cmd, cmd_size);
-
- /* Advance. */
- cmd_tail = cmd_next;
-
- /* Record "skb" for eventual freeing. */
- comp_tail = eq->comp_tail;
- eq->comps[comp_tail] = skb;
- LEPP_QINC(comp_tail);
- eq->comp_tail = comp_tail;
-
- /* Flush before allowing LEPP to handle the command. */
- /* ISSUE: Is this the optimal location for the flush? */
- __insn_mf();
-
- eq->cmd_tail = cmd_tail;
-
- /* NOTE: Using "4" here is more efficient than "0" or "2", */
- /* and, strangely, more efficient than pre-checking the number */
- /* of available completions, and comparing it to 4. */
- if (nolds == 0)
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
-
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-
- /* Handle completions. */
- for (i = 0; i < nolds; i++)
- kfree_skb(olds[i]);
-
- /* Update stats. */
- stats->tx_packets += num_segs;
- stats->tx_bytes += (num_segs * sh_len) + d_len;
-
- /* Make sure the egress timer is scheduled. */
- tile_net_schedule_egress_timer(info);
-
- return NETDEV_TX_OK;
-}
-
-
-/*
- * Transmit a packet (called by the kernel via "hard_start_xmit" hook).
- */
-static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_net_stats_t *stats = &info->stats;
-
- unsigned long irqflags;
-
- struct skb_shared_info *sh = skb_shinfo(skb);
-
- unsigned int len = skb->len;
- unsigned char *data = skb->data;
-
- unsigned int csum_start = skb_checksum_start_offset(skb);
-
- lepp_frag_t frags[LEPP_MAX_FRAGS];
-
- unsigned int num_frags;
-
- lepp_queue_t *eq = priv->eq;
-
- struct sk_buff *olds[8];
- unsigned int wanted = 8;
- unsigned int i, nolds = 0;
-
- unsigned int cmd_size = sizeof(lepp_cmd_t);
-
- unsigned int cmd_head, cmd_tail, cmd_next;
- unsigned int comp_tail;
-
- lepp_cmd_t cmds[LEPP_MAX_FRAGS];
-
-
- /*
- * This is paranoia, since we think that if the link doesn't come
- * up, telling Linux we have no carrier will keep it from trying
- * to transmit. If it does, though, we can't execute this routine,
- * since data structures we depend on aren't set up yet.
- */
- if (!info->registered)
- return NETDEV_TX_BUSY;
-
-
- /* Save the timestamp. */
- dev->trans_start = jiffies;
-
-
-#ifdef TILE_NET_PARANOIA
-#if CHIP_HAS_CBOX_HOME_MAP()
- if (hash_default) {
- HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)data);
- if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
- panic("Non-HFH egress buffer! VA=%p Mode=%d PTE=%llx",
- data, hv_pte_get_mode(pte), hv_pte_val(pte));
- }
-#endif
-#endif
-
-
-#ifdef TILE_NET_DUMP_PACKETS
- /* ISSUE: Does not dump the "frags". */
- dump_packet(data, skb_headlen(skb), "tx");
-#endif /* TILE_NET_DUMP_PACKETS */
-
-
- if (sh->gso_size != 0)
- return tile_net_tx_tso(skb, dev);
-
-
- /* Prepare the commands. */
-
- num_frags = tile_net_tx_frags(frags, skb, data, skb_headlen(skb));
-
- for (i = 0; i < num_frags; i++) {
-
- bool final = (i == num_frags - 1);
-
- lepp_cmd_t cmd = {
- .cpa_lo = frags[i].cpa_lo,
- .cpa_hi = frags[i].cpa_hi,
- .length = frags[i].length,
- .hash_for_home = frags[i].hash_for_home,
- .send_completion = final,
- .end_of_packet = final
- };
-
- if (i == 0 && skb->ip_summed == CHECKSUM_PARTIAL) {
- cmd.compute_checksum = 1;
- cmd.checksum_data.bits.start_byte = csum_start;
- cmd.checksum_data.bits.count = len - csum_start;
- cmd.checksum_data.bits.destination_byte =
- csum_start + skb->csum_offset;
- }
-
- cmds[i] = cmd;
- }
-
-
- /* Prefetch and wait, to minimize time spent holding the spinlock. */
- prefetch_L1(&eq->comp_tail);
- prefetch_L1(&eq->cmd_tail);
- mb();
-
-
- /* Enqueue the commands. */
-
- spin_lock_irqsave(&priv->eq_lock, irqflags);
-
- /*
- * Handle completions if needed to make room.
- * HACK: Spin until there is sufficient room.
- */
- if (lepp_num_free_comp_slots(eq) == 0) {
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
- if (nolds == 0) {
-busy:
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
- return NETDEV_TX_BUSY;
- }
- }
-
- cmd_head = eq->cmd_head;
- cmd_tail = eq->cmd_tail;
-
- /* Copy the commands, or fail. */
- for (i = 0; i < num_frags; i++) {
-
- /* Prepare to advance, detecting full queue. */
- cmd_next = cmd_tail + cmd_size;
- if (cmd_tail < cmd_head && cmd_next >= cmd_head)
- goto busy;
- if (cmd_next > LEPP_CMD_LIMIT) {
- cmd_next = 0;
- if (cmd_next == cmd_head)
- goto busy;
- }
-
- /* Copy the command. */
- *(lepp_cmd_t *)&eq->cmds[cmd_tail] = cmds[i];
-
- /* Advance. */
- cmd_tail = cmd_next;
- }
-
- /* Record "skb" for eventual freeing. */
- comp_tail = eq->comp_tail;
- eq->comps[comp_tail] = skb;
- LEPP_QINC(comp_tail);
- eq->comp_tail = comp_tail;
-
- /* Flush before allowing LEPP to handle the command. */
- /* ISSUE: Is this the optimal location for the flush? */
- __insn_mf();
-
- eq->cmd_tail = cmd_tail;
-
- /* NOTE: Using "4" here is more efficient than "0" or "2", */
- /* and, strangely, more efficient than pre-checking the number */
- /* of available completions, and comparing it to 4. */
- if (nolds == 0)
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
-
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-
- /* Handle completions. */
- for (i = 0; i < nolds; i++)
- kfree_skb(olds[i]);
-
- /* HACK: Track "expanded" size for short packets (e.g. 42 < 60). */
- stats->tx_packets++;
- stats->tx_bytes += ((len >= ETH_ZLEN) ? len : ETH_ZLEN);
-
- /* Make sure the egress timer is scheduled. */
- tile_net_schedule_egress_timer(info);
-
- return NETDEV_TX_OK;
-}
-
-
-/*
- * Deal with a transmit timeout.
- */
-static void tile_net_tx_timeout(struct net_device *dev)
-{
- PDEBUG("tile_net_tx_timeout()\n");
- PDEBUG("Transmit timeout at %ld, latency %ld\n", jiffies,
- jiffies - dev->trans_start);
-
- /* XXX: ISSUE: This doesn't seem useful for us. */
- netif_wake_queue(dev);
-}
-
-
-/*
- * Ioctl commands.
- */
-static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
- return -EOPNOTSUPP;
-}
-
-
-/*
- * Get System Network Statistics.
- *
- * Returns the address of the device statistics structure.
- */
-static struct net_device_stats *tile_net_get_stats(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- u32 rx_packets = 0;
- u32 tx_packets = 0;
- u32 rx_bytes = 0;
- u32 tx_bytes = 0;
- int i;
-
- for_each_online_cpu(i) {
- if (priv->cpu[i]) {
- rx_packets += priv->cpu[i]->stats.rx_packets;
- rx_bytes += priv->cpu[i]->stats.rx_bytes;
- tx_packets += priv->cpu[i]->stats.tx_packets;
- tx_bytes += priv->cpu[i]->stats.tx_bytes;
- }
- }
-
- priv->stats.rx_packets = rx_packets;
- priv->stats.rx_bytes = rx_bytes;
- priv->stats.tx_packets = tx_packets;
- priv->stats.tx_bytes = tx_bytes;
-
- return &priv->stats;
-}
-
-
-/*
- * Change the "mtu".
- *
- * The "change_mtu" method is usually not needed.
- * If you need it, it must be like this.
- */
-static int tile_net_change_mtu(struct net_device *dev, int new_mtu)
-{
- PDEBUG("tile_net_change_mtu()\n");
-
- /* Check ranges. */
- if ((new_mtu < 68) || (new_mtu > 1500))
- return -EINVAL;
-
- /* Accept the value. */
- dev->mtu = new_mtu;
-
- return 0;
-}
-
-
-/*
- * Change the Ethernet Address of the NIC.
- *
- * The hypervisor driver does not support changing MAC address. However,
- * the IPP does not do anything with the MAC address, so the address which
- * gets used on outgoing packets, and which is accepted on incoming packets,
- * is completely up to the NetIO program or kernel driver which is actually
- * handling them.
- *
- * Returns 0 on success, negative on failure.
- */
-static int tile_net_set_mac_address(struct net_device *dev, void *p)
-{
- struct sockaddr *addr = p;
-
- if (!is_valid_ether_addr(addr->sa_data))
- return -EINVAL;
-
- /* ISSUE: Note that "dev_addr" is now a pointer. */
- memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
-
- return 0;
-}
-
-
-/*
- * Obtain the MAC address from the hypervisor.
- * This must be done before opening the device.
- */
-static int tile_net_get_mac(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- char hv_dev_name[32];
- int len;
-
- __netio_getset_offset_t offset = { .word = NETIO_IPP_PARAM_OFF };
-
- int ret;
-
- /* For example, "xgbe0". */
- strcpy(hv_dev_name, dev->name);
- len = strlen(hv_dev_name);
-
- /* For example, "xgbe/0". */
- hv_dev_name[len] = hv_dev_name[len - 1];
- hv_dev_name[len - 1] = '/';
- len++;
-
- /* For example, "xgbe/0/native_hash". */
- strcpy(hv_dev_name + len, hash_default ? "/native_hash" : "/native");
-
- /* Get the hypervisor handle for this device. */
- priv->hv_devhdl = hv_dev_open((HV_VirtAddr)hv_dev_name, 0);
- PDEBUG("hv_dev_open(%s) returned %d %p\n",
- hv_dev_name, priv->hv_devhdl, &priv->hv_devhdl);
- if (priv->hv_devhdl < 0) {
- if (priv->hv_devhdl == HV_ENODEV)
- printk(KERN_DEBUG "Ignoring unconfigured device %s\n",
- hv_dev_name);
- else
- printk(KERN_DEBUG "hv_dev_open(%s) returned %d\n",
- hv_dev_name, priv->hv_devhdl);
- return -1;
- }
-
- /*
- * Read the hardware address from the hypervisor.
- * ISSUE: Note that "dev_addr" is now a pointer.
- */
- offset.bits.class = NETIO_PARAM;
- offset.bits.addr = NETIO_PARAM_MAC;
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)dev->dev_addr, dev->addr_len,
- offset.word);
- PDEBUG("hv_dev_pread(NETIO_PARAM_MAC) returned %d\n", ret);
- if (ret <= 0) {
- printk(KERN_DEBUG "hv_dev_pread(NETIO_PARAM_MAC) %s failed\n",
- dev->name);
- /*
- * Since the device is configured by the hypervisor but we
- * can't get its MAC address, we are most likely running
- * the simulator, so let's generate a random MAC address.
- */
- random_ether_addr(dev->dev_addr);
- }
-
- return 0;
-}
-
-
-static struct net_device_ops tile_net_ops = {
- .ndo_open = tile_net_open,
- .ndo_stop = tile_net_stop,
- .ndo_start_xmit = tile_net_tx,
- .ndo_do_ioctl = tile_net_ioctl,
- .ndo_get_stats = tile_net_get_stats,
- .ndo_change_mtu = tile_net_change_mtu,
- .ndo_tx_timeout = tile_net_tx_timeout,
- .ndo_set_mac_address = tile_net_set_mac_address
-};
-
-
-/*
- * The setup function.
- *
- * This uses ether_setup() to assign various fields in dev, including
- * setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields.
- */
-static void tile_net_setup(struct net_device *dev)
-{
- PDEBUG("tile_net_setup()\n");
-
- ether_setup(dev);
-
- dev->netdev_ops = &tile_net_ops;
-
- dev->watchdog_timeo = TILE_NET_TIMEOUT;
-
- /* We want lockless xmit. */
- dev->features |= NETIF_F_LLTX;
-
- /* We support hardware tx checksums. */
- dev->features |= NETIF_F_HW_CSUM;
-
- /* We support scatter/gather. */
- dev->features |= NETIF_F_SG;
-
- /* We support TSO. */
- dev->features |= NETIF_F_TSO;
-
-#ifdef TILE_NET_GSO
- /* We support GSO. */
- dev->features |= NETIF_F_GSO;
-#endif
-
- if (hash_default)
- dev->features |= NETIF_F_HIGHDMA;
-
- /* ISSUE: We should support NETIF_F_UFO. */
-
- dev->tx_queue_len = TILE_NET_TX_QUEUE_LEN;
-
- dev->mtu = TILE_NET_MTU;
-}
-
-
-/*
- * Allocate the device structure, register the device, and obtain the
- * MAC address from the hypervisor.
- */
-static struct net_device *tile_net_dev_init(const char *name)
-{
- int ret;
- struct net_device *dev;
- struct tile_net_priv *priv;
-
- /*
- * Allocate the device structure. This allocates "priv", calls
- * tile_net_setup(), and saves "name". Normally, "name" is a
- * template, instantiated by register_netdev(), but not for us.
- */
- dev = alloc_netdev(sizeof(*priv), name, tile_net_setup);
- if (!dev) {
- pr_err("alloc_netdev(%s) failed\n", name);
- return NULL;
- }
-
- priv = netdev_priv(dev);
-
- /* Initialize "priv". */
-
- memset(priv, 0, sizeof(*priv));
-
- /* Save "dev" for "tile_net_open_retry()". */
- priv->dev = dev;
-
- INIT_DELAYED_WORK(&priv->retry_work, tile_net_open_retry);
-
- spin_lock_init(&priv->eq_lock);
-
- /* Allocate "eq". */
- priv->eq_pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, EQ_ORDER);
- if (!priv->eq_pages) {
- free_netdev(dev);
- return NULL;
- }
- priv->eq = page_address(priv->eq_pages);
-
- /* Register the network device. */
- ret = register_netdev(dev);
- if (ret) {
- pr_err("register_netdev %s failed %d\n", dev->name, ret);
- __free_pages(priv->eq_pages, EQ_ORDER);
- free_netdev(dev);
- return NULL;
- }
-
- /* Get the MAC address. */
- ret = tile_net_get_mac(dev);
- if (ret < 0) {
- unregister_netdev(dev);
- __free_pages(priv->eq_pages, EQ_ORDER);
- free_netdev(dev);
- return NULL;
- }
-
- return dev;
-}
-
-
-/*
- * Module cleanup.
- *
- * FIXME: If compiled as a module, this module cannot be "unloaded",
- * because the "ingress interrupt handler" is registered permanently.
- */
-static void tile_net_cleanup(void)
-{
- int i;
-
- for (i = 0; i < TILE_NET_DEVS; i++) {
- if (tile_net_devs[i]) {
- struct net_device *dev = tile_net_devs[i];
- struct tile_net_priv *priv = netdev_priv(dev);
- unregister_netdev(dev);
- finv_buffer_remote(priv->eq, EQ_SIZE, 0);
- __free_pages(priv->eq_pages, EQ_ORDER);
- free_netdev(dev);
- }
- }
-}
-
-
-/*
- * Module initialization.
- */
-static int tile_net_init_module(void)
-{
- pr_info("Tilera IPP Net Driver\n");
-
- tile_net_devs[0] = tile_net_dev_init("xgbe0");
- tile_net_devs[1] = tile_net_dev_init("xgbe1");
- tile_net_devs[2] = tile_net_dev_init("gbe0");
- tile_net_devs[3] = tile_net_dev_init("gbe1");
-
- return 0;
-}
-
-
-module_init(tile_net_init_module);
-module_exit(tile_net_cleanup);
-
-
-#ifndef MODULE
-
-/*
- * The "network_cpus" boot argument specifies the cpus that are dedicated
- * to handle ingress packets.
- *
- * The parameter should be in the form "network_cpus=m-n[,x-y]", where
- * m, n, x, y are integer numbers that represent the cpus that can be
- * neither a dedicated cpu nor a dataplane cpu.
- */
-static int __init network_cpus_setup(char *str)
-{
- int rc = cpulist_parse_crop(str, &network_cpus_map);
- if (rc != 0) {
- pr_warning("network_cpus=%s: malformed cpu list\n",
- str);
- } else {
-
- /* Remove dedicated cpus. */
- cpumask_and(&network_cpus_map, &network_cpus_map,
- cpu_possible_mask);
-
-
- if (cpumask_empty(&network_cpus_map)) {
- pr_warning("Ignoring network_cpus='%s'.\n",
- str);
- } else {
- char buf[1024];
- cpulist_scnprintf(buf, sizeof(buf), &network_cpus_map);
- pr_info("Linux network CPUs: %s\n", buf);
- network_cpus_used = true;
- }
- }
-
- return 0;
-}
-__setup("network_cpus=", network_cpus_setup);
-
-#endif
projects / firefly-linux-kernel-4.4.55.git / commitdiff