--- /dev/null
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/kthread.h>
+#include <linux/crc32.h>
+#include <linux/cpu.h>
+#include <linux/fs.h>
+#include <linux/sysfs.h>
+#include <linux/ctype.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsicam.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_fc.h>
+#include <net/rtnetlink.h>
+
+#include <scsi/fc/fc_encaps.h>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_frame.h>
+#include <scsi/libfcoe.h>
+
+static int debug_fcoe;
+
+#define FCOE_MAX_QUEUE_DEPTH 256
+#define FCOE_LOW_QUEUE_DEPTH 32
+
+/* destination address mode */
+#define FCOE_GW_ADDR_MODE 0x00
+#define FCOE_FCOUI_ADDR_MODE 0x01
+
+#define FCOE_WORD_TO_BYTE 4
+
+#define FCOE_VERSION "0.1"
+#define FCOE_NAME "fcoe"
+#define FCOE_VENDOR "Open-FCoE.org"
+
+#define FCOE_MAX_LUN 255
+#define FCOE_MAX_FCP_TARGET 256
+
+#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
+
+#define FCOE_MIN_XID 0x0001 /* the min xid supported by fcoe_sw */
+#define FCOE_MAX_XID 0x07ef /* the max xid supported by fcoe_sw */
+
+MODULE_AUTHOR("Open-FCoE.org");
+MODULE_DESCRIPTION("FCoE");
+MODULE_LICENSE("GPL");
+
+/* fcoe host list */
+LIST_HEAD(fcoe_hostlist);
+DEFINE_RWLOCK(fcoe_hostlist_lock);
+DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
+DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
+
+
+/* Function Prototyes */
+static int fcoe_check_wait_queue(struct fc_lport *);
+static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
+static int fcoe_device_notification(struct notifier_block *, ulong, void *);
+static void fcoe_dev_setup(void);
+static void fcoe_dev_cleanup(void);
+
+/* notification function from net device */
+static struct notifier_block fcoe_notifier = {
+ .notifier_call = fcoe_device_notification,
+};
+
+static struct scsi_transport_template *scsi_transport_fcoe_sw;
+
+struct fc_function_template fcoe_transport_function = {
+ .show_host_node_name = 1,
+ .show_host_port_name = 1,
+ .show_host_supported_classes = 1,
+ .show_host_supported_fc4s = 1,
+ .show_host_active_fc4s = 1,
+ .show_host_maxframe_size = 1,
+
+ .show_host_port_id = 1,
+ .show_host_supported_speeds = 1,
+ .get_host_speed = fc_get_host_speed,
+ .show_host_speed = 1,
+ .show_host_port_type = 1,
+ .get_host_port_state = fc_get_host_port_state,
+ .show_host_port_state = 1,
+ .show_host_symbolic_name = 1,
+
+ .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
+ .show_rport_maxframe_size = 1,
+ .show_rport_supported_classes = 1,
+
+ .show_host_fabric_name = 1,
+ .show_starget_node_name = 1,
+ .show_starget_port_name = 1,
+ .show_starget_port_id = 1,
+ .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
+ .show_rport_dev_loss_tmo = 1,
+ .get_fc_host_stats = fc_get_host_stats,
+ .issue_fc_host_lip = fcoe_reset,
+
+ .terminate_rport_io = fc_rport_terminate_io,
+};
+
+static struct scsi_host_template fcoe_shost_template = {
+ .module = THIS_MODULE,
+ .name = "FCoE Driver",
+ .proc_name = FCOE_NAME,
+ .queuecommand = fc_queuecommand,
+ .eh_abort_handler = fc_eh_abort,
+ .eh_device_reset_handler = fc_eh_device_reset,
+ .eh_host_reset_handler = fc_eh_host_reset,
+ .slave_alloc = fc_slave_alloc,
+ .change_queue_depth = fc_change_queue_depth,
+ .change_queue_type = fc_change_queue_type,
+ .this_id = -1,
+ .cmd_per_lun = 32,
+ .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
+ .use_clustering = ENABLE_CLUSTERING,
+ .sg_tablesize = SG_ALL,
+ .max_sectors = 0xffff,
+};
+
+/**
+ * fcoe_lport_config() - sets up the fc_lport
+ * @lp: ptr to the fc_lport
+ * @shost: ptr to the parent scsi host
+ *
+ * Returns: 0 for success
+ */
+static int fcoe_lport_config(struct fc_lport *lp)
+{
+ lp->link_up = 0;
+ lp->qfull = 0;
+ lp->max_retry_count = 3;
+ lp->e_d_tov = 2 * 1000; /* FC-FS default */
+ lp->r_a_tov = 2 * 2 * 1000;
+ lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
+ FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
+
+ fc_lport_init_stats(lp);
+
+ /* lport fc_lport related configuration */
+ fc_lport_config(lp);
+
+ /* offload related configuration */
+ lp->crc_offload = 0;
+ lp->seq_offload = 0;
+ lp->lro_enabled = 0;
+ lp->lro_xid = 0;
+ lp->lso_max = 0;
+
+ return 0;
+}
+
+/**
+ * fcoe_netdev_config() - Set up netdev for SW FCoE
+ * @lp : ptr to the fc_lport
+ * @netdev : ptr to the associated netdevice struct
+ *
+ * Must be called after fcoe_lport_config() as it will use lport mutex
+ *
+ * Returns : 0 for success
+ */
+static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
+{
+ u32 mfs;
+ u64 wwnn, wwpn;
+ struct fcoe_softc *fc;
+ u8 flogi_maddr[ETH_ALEN];
+
+ /* Setup lport private data to point to fcoe softc */
+ fc = lport_priv(lp);
+ fc->lp = lp;
+ fc->real_dev = netdev;
+ fc->phys_dev = netdev;
+
+ /* Require support for get_pauseparam ethtool op. */
+ if (netdev->priv_flags & IFF_802_1Q_VLAN)
+ fc->phys_dev = vlan_dev_real_dev(netdev);
+
+ /* Do not support for bonding device */
+ if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) ||
+ (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) ||
+ (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) {
+ return -EOPNOTSUPP;
+ }
+
+ /*
+ * Determine max frame size based on underlying device and optional
+ * user-configured limit. If the MFS is too low, fcoe_link_ok()
+ * will return 0, so do this first.
+ */
+ mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) +
+ sizeof(struct fcoe_crc_eof));
+ if (fc_set_mfs(lp, mfs))
+ return -EINVAL;
+
+ if (!fcoe_link_ok(lp))
+ lp->link_up = 1;
+
+ /* offload features support */
+ if (fc->real_dev->features & NETIF_F_SG)
+ lp->sg_supp = 1;
+
+#ifdef NETIF_F_FCOE_CRC
+ if (netdev->features & NETIF_F_FCOE_CRC) {
+ lp->crc_offload = 1;
+ printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n",
+ netdev->name);
+ }
+#endif
+#ifdef NETIF_F_FSO
+ if (netdev->features & NETIF_F_FSO) {
+ lp->seq_offload = 1;
+ lp->lso_max = netdev->gso_max_size;
+ printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n",
+ netdev->name, lp->lso_max);
+ }
+#endif
+ if (netdev->fcoe_ddp_xid) {
+ lp->lro_enabled = 1;
+ lp->lro_xid = netdev->fcoe_ddp_xid;
+ printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n",
+ netdev->name, lp->lro_xid);
+ }
+ skb_queue_head_init(&fc->fcoe_pending_queue);
+ fc->fcoe_pending_queue_active = 0;
+
+ /* setup Source Mac Address */
+ memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr,
+ fc->real_dev->addr_len);
+
+ wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
+ fc_set_wwnn(lp, wwnn);
+ /* XXX - 3rd arg needs to be vlan id */
+ wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0);
+ fc_set_wwpn(lp, wwpn);
+
+ /*
+ * Add FCoE MAC address as second unicast MAC address
+ * or enter promiscuous mode if not capable of listening
+ * for multiple unicast MACs.
+ */
+ rtnl_lock();
+ memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
+ dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN);
+ rtnl_unlock();
+
+ /*
+ * setup the receive function from ethernet driver
+ * on the ethertype for the given device
+ */
+ fc->fcoe_packet_type.func = fcoe_rcv;
+ fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
+ fc->fcoe_packet_type.dev = fc->real_dev;
+ dev_add_pack(&fc->fcoe_packet_type);
+
+ return 0;
+}
+
+/**
+ * fcoe_shost_config() - Sets up fc_lport->host
+ * @lp : ptr to the fc_lport
+ * @shost : ptr to the associated scsi host
+ * @dev : device associated to scsi host
+ *
+ * Must be called after fcoe_lport_config() and fcoe_netdev_config()
+ *
+ * Returns : 0 for success
+ */
+static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost,
+ struct device *dev)
+{
+ int rc = 0;
+
+ /* lport scsi host config */
+ lp->host = shost;
+
+ lp->host->max_lun = FCOE_MAX_LUN;
+ lp->host->max_id = FCOE_MAX_FCP_TARGET;
+ lp->host->max_channel = 0;
+ lp->host->transportt = scsi_transport_fcoe_sw;
+
+ /* add the new host to the SCSI-ml */
+ rc = scsi_add_host(lp->host, dev);
+ if (rc) {
+ FC_DBG("fcoe_shost_config:error on scsi_add_host\n");
+ return rc;
+ }
+ sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
+ FCOE_NAME, FCOE_VERSION,
+ fcoe_netdev(lp)->name);
+
+ return 0;
+}
+
+/**
+ * fcoe_em_config() - allocates em for this lport
+ * @lp: the port that em is to allocated for
+ *
+ * Returns : 0 on success
+ */
+static inline int fcoe_em_config(struct fc_lport *lp)
+{
+ BUG_ON(lp->emp);
+
+ lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3,
+ FCOE_MIN_XID, FCOE_MAX_XID);
+ if (!lp->emp)
+ return -ENOMEM;
+
+ return 0;
+}
+
+/**
+ * fcoe_if_destroy() - FCoE software HBA tear-down function
+ * @netdev: ptr to the associated net_device
+ *
+ * Returns: 0 if link is OK for use by FCoE.
+ */
+static int fcoe_if_destroy(struct net_device *netdev)
+{
+ struct fc_lport *lp = NULL;
+ struct fcoe_softc *fc;
+ u8 flogi_maddr[ETH_ALEN];
+
+ BUG_ON(!netdev);
+
+ printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n",
+ netdev->name);
+
+ lp = fcoe_hostlist_lookup(netdev);
+ if (!lp)
+ return -ENODEV;
+
+ fc = lport_priv(lp);
+
+ /* Logout of the fabric */
+ fc_fabric_logoff(lp);
+
+ /* Remove the instance from fcoe's list */
+ fcoe_hostlist_remove(lp);
+
+ /* Don't listen for Ethernet packets anymore */
+ dev_remove_pack(&fc->fcoe_packet_type);
+
+ /* Cleanup the fc_lport */
+ fc_lport_destroy(lp);
+ fc_fcp_destroy(lp);
+
+ /* Detach from the scsi-ml */
+ fc_remove_host(lp->host);
+ scsi_remove_host(lp->host);
+
+ /* There are no more rports or I/O, free the EM */
+ if (lp->emp)
+ fc_exch_mgr_free(lp->emp);
+
+ /* Delete secondary MAC addresses */
+ rtnl_lock();
+ memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
+ dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN);
+ if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
+ dev_unicast_delete(fc->real_dev, fc->data_src_addr, ETH_ALEN);
+ rtnl_unlock();
+
+ /* Free the per-CPU revieve threads */
+ fcoe_percpu_clean(lp);
+
+ /* Free existing skbs */
+ fcoe_clean_pending_queue(lp);
+
+ /* Free memory used by statistical counters */
+ fc_lport_free_stats(lp);
+
+ /* Release the net_device and Scsi_Host */
+ dev_put(fc->real_dev);
+ scsi_host_put(lp->host);
+
+ return 0;
+}
+
+/*
+ * fcoe_ddp_setup - calls LLD's ddp_setup through net_device
+ * @lp: the corresponding fc_lport
+ * @xid: the exchange id for this ddp transfer
+ * @sgl: the scatterlist describing this transfer
+ * @sgc: number of sg items
+ *
+ * Returns : 0 no ddp
+ */
+static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid,
+ struct scatterlist *sgl, unsigned int sgc)
+{
+ struct net_device *n = fcoe_netdev(lp);
+
+ if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup)
+ return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc);
+
+ return 0;
+}
+
+/*
+ * fcoe_ddp_done - calls LLD's ddp_done through net_device
+ * @lp: the corresponding fc_lport
+ * @xid: the exchange id for this ddp transfer
+ *
+ * Returns : the length of data that have been completed by ddp
+ */
+static int fcoe_ddp_done(struct fc_lport *lp, u16 xid)
+{
+ struct net_device *n = fcoe_netdev(lp);
+
+ if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done)
+ return n->netdev_ops->ndo_fcoe_ddp_done(n, xid);
+ return 0;
+}
+
+static struct libfc_function_template fcoe_libfc_fcn_templ = {
+ .frame_send = fcoe_xmit,
+ .ddp_setup = fcoe_ddp_setup,
+ .ddp_done = fcoe_ddp_done,
+};
+
+/**
+ * fcoe_if_create() - this function creates the fcoe interface
+ * @netdev: pointer the associated netdevice
+ *
+ * Creates fc_lport struct and scsi_host for lport, configures lport
+ * and starts fabric login.
+ *
+ * Returns : 0 on success
+ */
+static int fcoe_if_create(struct net_device *netdev)
+{
+ int rc;
+ struct fc_lport *lp = NULL;
+ struct fcoe_softc *fc;
+ struct Scsi_Host *shost;
+
+ BUG_ON(!netdev);
+
+ printk(KERN_DEBUG "fcoe_if_create:interface on %s\n",
+ netdev->name);
+
+ lp = fcoe_hostlist_lookup(netdev);
+ if (lp)
+ return -EEXIST;
+
+ shost = fcoe_host_alloc(&fcoe_shost_template,
+ sizeof(struct fcoe_softc));
+ if (!shost) {
+ FC_DBG("Could not allocate host structure\n");
+ return -ENOMEM;
+ }
+ lp = shost_priv(shost);
+ fc = lport_priv(lp);
+
+ /* configure fc_lport, e.g., em */
+ rc = fcoe_lport_config(lp);
+ if (rc) {
+ FC_DBG("Could not configure lport\n");
+ goto out_host_put;
+ }
+
+ /* configure lport network properties */
+ rc = fcoe_netdev_config(lp, netdev);
+ if (rc) {
+ FC_DBG("Could not configure netdev for lport\n");
+ goto out_host_put;
+ }
+
+ /* configure lport scsi host properties */
+ rc = fcoe_shost_config(lp, shost, &netdev->dev);
+ if (rc) {
+ FC_DBG("Could not configure shost for lport\n");
+ goto out_host_put;
+ }
+
+ /* lport exch manager allocation */
+ rc = fcoe_em_config(lp);
+ if (rc) {
+ FC_DBG("Could not configure em for lport\n");
+ goto out_host_put;
+ }
+
+ /* Initialize the library */
+ rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ);
+ if (rc) {
+ FC_DBG("Could not configure libfc for lport!\n");
+ goto out_lp_destroy;
+ }
+
+ /* add to lports list */
+ fcoe_hostlist_add(lp);
+
+ lp->boot_time = jiffies;
+
+ fc_fabric_login(lp);
+
+ dev_hold(netdev);
+
+ return rc;
+
+out_lp_destroy:
+ fc_exch_mgr_free(lp->emp); /* Free the EM */
+out_host_put:
+ scsi_host_put(lp->host);
+ return rc;
+}
+
+/**
+ * fcoe_if_init() - attach to scsi transport
+ *
+ * Returns : 0 on success
+ */
+static int __init fcoe_if_init(void)
+{
+ /* attach to scsi transport */
+ scsi_transport_fcoe_sw =
+ fc_attach_transport(&fcoe_transport_function);
+
+ if (!scsi_transport_fcoe_sw) {
+ printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/**
+ * fcoe_if_exit() - detach from scsi transport
+ *
+ * Returns : 0 on success
+ */
+int __exit fcoe_if_exit(void)
+{
+ fc_release_transport(scsi_transport_fcoe_sw);
+ return 0;
+}
+
+/**
+ * fcoe_percpu_thread_create() - Create a receive thread for an online cpu
+ * @cpu: cpu index for the online cpu
+ */
+static void fcoe_percpu_thread_create(unsigned int cpu)
+{
+ struct fcoe_percpu_s *p;
+ struct task_struct *thread;
+
+ p = &per_cpu(fcoe_percpu, cpu);
+
+ thread = kthread_create(fcoe_percpu_receive_thread,
+ (void *)p, "fcoethread/%d", cpu);
+
+ if (likely(!IS_ERR(p->thread))) {
+ kthread_bind(thread, cpu);
+ wake_up_process(thread);
+
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ p->thread = thread;
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+ }
+}
+
+/**
+ * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu
+ * @cpu: cpu index the rx thread is to be removed
+ *
+ * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
+ * current CPU's Rx thread. If the thread being destroyed is bound to
+ * the CPU processing this context the skbs will be freed.
+ */
+static void fcoe_percpu_thread_destroy(unsigned int cpu)
+{
+ struct fcoe_percpu_s *p;
+ struct task_struct *thread;
+ struct page *crc_eof;
+ struct sk_buff *skb;
+#ifdef CONFIG_SMP
+ struct fcoe_percpu_s *p0;
+ unsigned targ_cpu = smp_processor_id();
+#endif /* CONFIG_SMP */
+
+ printk(KERN_DEBUG "fcoe: Destroying receive thread for CPU %d\n", cpu);
+
+ /* Prevent any new skbs from being queued for this CPU. */
+ p = &per_cpu(fcoe_percpu, cpu);
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ thread = p->thread;
+ p->thread = NULL;
+ crc_eof = p->crc_eof_page;
+ p->crc_eof_page = NULL;
+ p->crc_eof_offset = 0;
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+
+#ifdef CONFIG_SMP
+ /*
+ * Don't bother moving the skb's if this context is running
+ * on the same CPU that is having its thread destroyed. This
+ * can easily happen when the module is removed.
+ */
+ if (cpu != targ_cpu) {
+ p0 = &per_cpu(fcoe_percpu, targ_cpu);
+ spin_lock_bh(&p0->fcoe_rx_list.lock);
+ if (p0->thread) {
+ FC_DBG("Moving frames from CPU %d to CPU %d\n",
+ cpu, targ_cpu);
+
+ while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
+ __skb_queue_tail(&p0->fcoe_rx_list, skb);
+ spin_unlock_bh(&p0->fcoe_rx_list.lock);
+ } else {
+ /*
+ * The targeted CPU is not initialized and cannot accept
+ * new skbs. Unlock the targeted CPU and drop the skbs
+ * on the CPU that is going offline.
+ */
+ while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
+ kfree_skb(skb);
+ spin_unlock_bh(&p0->fcoe_rx_list.lock);
+ }
+ } else {
+ /*
+ * This scenario occurs when the module is being removed
+ * and all threads are being destroyed. skbs will continue
+ * to be shifted from the CPU thread that is being removed
+ * to the CPU thread associated with the CPU that is processing
+ * the module removal. Once there is only one CPU Rx thread it
+ * will reach this case and we will drop all skbs and later
+ * stop the thread.
+ */
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
+ kfree_skb(skb);
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+ }
+#else
+ /*
+ * This a non-SMP scenario where the singluar Rx thread is
+ * being removed. Free all skbs and stop the thread.
+ */
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
+ kfree_skb(skb);
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+#endif
+
+ if (thread)
+ kthread_stop(thread);
+
+ if (crc_eof)
+ put_page(crc_eof);
+}
+
+/**
+ * fcoe_cpu_callback() - fcoe cpu hotplug event callback
+ * @nfb: callback data block
+ * @action: event triggering the callback
+ * @hcpu: index for the cpu of this event
+ *
+ * This creates or destroys per cpu data for fcoe
+ *
+ * Returns NOTIFY_OK always.
+ */
+static int fcoe_cpu_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ unsigned cpu = (unsigned long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ FC_DBG("CPU %x online: Create Rx thread\n", cpu);
+ fcoe_percpu_thread_create(cpu);
+ break;
+ case CPU_DEAD:
+ case CPU_DEAD_FROZEN:
+ FC_DBG("CPU %x offline: Remove Rx thread\n", cpu);
+ fcoe_percpu_thread_destroy(cpu);
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block fcoe_cpu_notifier = {
+ .notifier_call = fcoe_cpu_callback,
+};
+
+/**
+ * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
+ * @skb: the receive skb
+ * @dev: associated net device
+ * @ptype: context
+ * @odldev: last device
+ *
+ * this function will receive the packet and build fc frame and pass it up
+ *
+ * Returns: 0 for success
+ */
+int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *ptype, struct net_device *olddev)
+{
+ struct fc_lport *lp;
+ struct fcoe_rcv_info *fr;
+ struct fcoe_softc *fc;
+ struct fc_frame_header *fh;
+ struct fcoe_percpu_s *fps;
+ unsigned short oxid;
+ unsigned int cpu = 0;
+
+ fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
+ lp = fc->lp;
+ if (unlikely(lp == NULL)) {
+ FC_DBG("cannot find hba structure");
+ goto err2;
+ }
+
+ if (unlikely(debug_fcoe)) {
+ FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
+ "end:%p sum:%d dev:%s", skb->len, skb->data_len,
+ skb->head, skb->data, skb_tail_pointer(skb),
+ skb_end_pointer(skb), skb->csum,
+ skb->dev ? skb->dev->name : "<NULL>");
+
+ }
+
+ /* check for FCOE packet type */
+ if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
+ FC_DBG("wrong FC type frame");
+ goto err;
+ }
+
+ /*
+ * Check for minimum frame length, and make sure required FCoE
+ * and FC headers are pulled into the linear data area.
+ */
+ if (unlikely((skb->len < FCOE_MIN_FRAME) ||
+ !pskb_may_pull(skb, FCOE_HEADER_LEN)))
+ goto err;
+
+ skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
+ fh = (struct fc_frame_header *) skb_transport_header(skb);
+
+ oxid = ntohs(fh->fh_ox_id);
+
+ fr = fcoe_dev_from_skb(skb);
+ fr->fr_dev = lp;
+ fr->ptype = ptype;
+
+#ifdef CONFIG_SMP
+ /*
+ * The incoming frame exchange id(oxid) is ANDed with num of online
+ * cpu bits to get cpu and then this cpu is used for selecting
+ * a per cpu kernel thread from fcoe_percpu.
+ */
+ cpu = oxid & (num_online_cpus() - 1);
+#endif
+
+ fps = &per_cpu(fcoe_percpu, cpu);
+ spin_lock_bh(&fps->fcoe_rx_list.lock);
+ if (unlikely(!fps->thread)) {
+ /*
+ * The targeted CPU is not ready, let's target
+ * the first CPU now. For non-SMP systems this
+ * will check the same CPU twice.
+ */
+ FC_DBG("CPU is online, but no receive thread ready "
+ "for incoming skb- using first online CPU.\n");
+
+ spin_unlock_bh(&fps->fcoe_rx_list.lock);
+ cpu = first_cpu(cpu_online_map);
+ fps = &per_cpu(fcoe_percpu, cpu);
+ spin_lock_bh(&fps->fcoe_rx_list.lock);
+ if (!fps->thread) {
+ spin_unlock_bh(&fps->fcoe_rx_list.lock);
+ goto err;
+ }
+ }
+
+ /*
+ * We now have a valid CPU that we're targeting for
+ * this skb. We also have this receive thread locked,
+ * so we're free to queue skbs into it's queue.
+ */
+ __skb_queue_tail(&fps->fcoe_rx_list, skb);
+ if (fps->fcoe_rx_list.qlen == 1)
+ wake_up_process(fps->thread);
+
+ spin_unlock_bh(&fps->fcoe_rx_list.lock);
+
+ return 0;
+err:
+ fc_lport_get_stats(lp)->ErrorFrames++;
+
+err2:
+ kfree_skb(skb);
+ return -1;
+}
+EXPORT_SYMBOL_GPL(fcoe_rcv);
+
+/**
+ * fcoe_start_io() - pass to netdev to start xmit for fcoe
+ * @skb: the skb to be xmitted
+ *
+ * Returns: 0 for success
+ */
+static inline int fcoe_start_io(struct sk_buff *skb)
+{
+ int rc;
+
+ skb_get(skb);
+ rc = dev_queue_xmit(skb);
+ if (rc != 0)
+ return rc;
+ kfree_skb(skb);
+ return 0;
+}
+
+/**
+ * fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof
+ * @skb: the skb to be xmitted
+ * @tlen: total len
+ *
+ * Returns: 0 for success
+ */
+static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
+{
+ struct fcoe_percpu_s *fps;
+ struct page *page;
+
+ fps = &get_cpu_var(fcoe_percpu);
+ page = fps->crc_eof_page;
+ if (!page) {
+ page = alloc_page(GFP_ATOMIC);
+ if (!page) {
+ put_cpu_var(fcoe_percpu);
+ return -ENOMEM;
+ }
+ fps->crc_eof_page = page;
+ fps->crc_eof_offset = 0;
+ }
+
+ get_page(page);
+ skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
+ fps->crc_eof_offset, tlen);
+ skb->len += tlen;
+ skb->data_len += tlen;
+ skb->truesize += tlen;
+ fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
+
+ if (fps->crc_eof_offset >= PAGE_SIZE) {
+ fps->crc_eof_page = NULL;
+ fps->crc_eof_offset = 0;
+ put_page(page);
+ }
+ put_cpu_var(fcoe_percpu);
+ return 0;
+}
+
+/**
+ * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
+ * @fp: the fc_frame containg data to be checksummed
+ *
+ * This uses crc32() to calculate the crc for fc frame
+ * Return : 32 bit crc
+ */
+u32 fcoe_fc_crc(struct fc_frame *fp)
+{
+ struct sk_buff *skb = fp_skb(fp);
+ struct skb_frag_struct *frag;
+ unsigned char *data;
+ unsigned long off, len, clen;
+ u32 crc;
+ unsigned i;
+
+ crc = crc32(~0, skb->data, skb_headlen(skb));
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
+ frag = &skb_shinfo(skb)->frags[i];
+ off = frag->page_offset;
+ len = frag->size;
+ while (len > 0) {
+ clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
+ data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
+ KM_SKB_DATA_SOFTIRQ);
+ crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
+ kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
+ off += clen;
+ len -= clen;
+ }
+ }
+ return crc;
+}
+EXPORT_SYMBOL_GPL(fcoe_fc_crc);
+
+/**
+ * fcoe_xmit() - FCoE frame transmit function
+ * @lp: the associated local port
+ * @fp: the fc_frame to be transmitted
+ *
+ * Return : 0 for success
+ */
+int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
+{
+ int wlen, rc = 0;
+ u32 crc;
+ struct ethhdr *eh;
+ struct fcoe_crc_eof *cp;
+ struct sk_buff *skb;
+ struct fcoe_dev_stats *stats;
+ struct fc_frame_header *fh;
+ unsigned int hlen; /* header length implies the version */
+ unsigned int tlen; /* trailer length */
+ unsigned int elen; /* eth header, may include vlan */
+ int flogi_in_progress = 0;
+ struct fcoe_softc *fc;
+ u8 sof, eof;
+ struct fcoe_hdr *hp;
+
+ WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
+
+ fc = lport_priv(lp);
+ /*
+ * if it is a flogi then we need to learn gw-addr
+ * and my own fcid
+ */
+ fh = fc_frame_header_get(fp);
+ if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
+ if (fc_frame_payload_op(fp) == ELS_FLOGI) {
+ fc->flogi_oxid = ntohs(fh->fh_ox_id);
+ fc->address_mode = FCOE_FCOUI_ADDR_MODE;
+ fc->flogi_progress = 1;
+ flogi_in_progress = 1;
+ } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) {
+ /*
+ * Here we must've gotten an SID by accepting an FLOGI
+ * from a point-to-point connection. Switch to using
+ * the source mac based on the SID. The destination
+ * MAC in this case would have been set by receving the
+ * FLOGI.
+ */
+ fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
+ fc->flogi_progress = 0;
+ }
+ }
+
+ skb = fp_skb(fp);
+ sof = fr_sof(fp);
+ eof = fr_eof(fp);
+
+ elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ?
+ sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr);
+ hlen = sizeof(struct fcoe_hdr);
+ tlen = sizeof(struct fcoe_crc_eof);
+ wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
+
+ /* crc offload */
+ if (likely(lp->crc_offload)) {
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ skb->csum_start = skb_headroom(skb);
+ skb->csum_offset = skb->len;
+ crc = 0;
+ } else {
+ skb->ip_summed = CHECKSUM_NONE;
+ crc = fcoe_fc_crc(fp);
+ }
+
+ /* copy fc crc and eof to the skb buff */
+ if (skb_is_nonlinear(skb)) {
+ skb_frag_t *frag;
+ if (fcoe_get_paged_crc_eof(skb, tlen)) {
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
+ frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
+ cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
+ + frag->page_offset;
+ } else {
+ cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
+ }
+
+ memset(cp, 0, sizeof(*cp));
+ cp->fcoe_eof = eof;
+ cp->fcoe_crc32 = cpu_to_le32(~crc);
+
+ if (skb_is_nonlinear(skb)) {
+ kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
+ cp = NULL;
+ }
+
+ /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */
+ skb_push(skb, elen + hlen);
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+ skb->mac_len = elen;
+ skb->protocol = htons(ETH_P_FCOE);
+ skb->dev = fc->real_dev;
+
+ /* fill up mac and fcoe headers */
+ eh = eth_hdr(skb);
+ eh->h_proto = htons(ETH_P_FCOE);
+ if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
+ fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
+ else
+ /* insert GW address */
+ memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
+
+ if (unlikely(flogi_in_progress))
+ memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
+ else
+ memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);
+
+ hp = (struct fcoe_hdr *)(eh + 1);
+ memset(hp, 0, sizeof(*hp));
+ if (FC_FCOE_VER)
+ FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
+ hp->fcoe_sof = sof;
+
+#ifdef NETIF_F_FSO
+ /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
+ if (lp->seq_offload && fr_max_payload(fp)) {
+ skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
+ skb_shinfo(skb)->gso_size = fr_max_payload(fp);
+ } else {
+ skb_shinfo(skb)->gso_type = 0;
+ skb_shinfo(skb)->gso_size = 0;
+ }
+#endif
+ /* update tx stats: regardless if LLD fails */
+ stats = fc_lport_get_stats(lp);
+ stats->TxFrames++;
+ stats->TxWords += wlen;
+
+ /* send down to lld */
+ fr_dev(fp) = lp;
+ if (fc->fcoe_pending_queue.qlen)
+ rc = fcoe_check_wait_queue(lp);
+
+ if (rc == 0)
+ rc = fcoe_start_io(skb);
+
+ if (rc) {
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ __skb_queue_tail(&fc->fcoe_pending_queue, skb);
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
+ lp->qfull = 1;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_xmit);
+
+/**
+ * fcoe_percpu_receive_thread() - recv thread per cpu
+ * @arg: ptr to the fcoe per cpu struct
+ *
+ * Return: 0 for success
+ */
+int fcoe_percpu_receive_thread(void *arg)
+{
+ struct fcoe_percpu_s *p = arg;
+ u32 fr_len;
+ struct fc_lport *lp;
+ struct fcoe_rcv_info *fr;
+ struct fcoe_dev_stats *stats;
+ struct fc_frame_header *fh;
+ struct sk_buff *skb;
+ struct fcoe_crc_eof crc_eof;
+ struct fc_frame *fp;
+ u8 *mac = NULL;
+ struct fcoe_softc *fc;
+ struct fcoe_hdr *hp;
+
+ set_user_nice(current, -20);
+
+ while (!kthread_should_stop()) {
+
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+ schedule();
+ set_current_state(TASK_RUNNING);
+ if (kthread_should_stop())
+ return 0;
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ }
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+ fr = fcoe_dev_from_skb(skb);
+ lp = fr->fr_dev;
+ if (unlikely(lp == NULL)) {
+ FC_DBG("invalid HBA Structure");
+ kfree_skb(skb);
+ continue;
+ }
+
+ if (unlikely(debug_fcoe)) {
+ FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
+ "tail:%p end:%p sum:%d dev:%s",
+ skb->len, skb->data_len,
+ skb->head, skb->data, skb_tail_pointer(skb),
+ skb_end_pointer(skb), skb->csum,
+ skb->dev ? skb->dev->name : "<NULL>");
+ }
+
+ /*
+ * Save source MAC address before discarding header.
+ */
+ fc = lport_priv(lp);
+ if (unlikely(fc->flogi_progress))
+ mac = eth_hdr(skb)->h_source;
+
+ if (skb_is_nonlinear(skb))
+ skb_linearize(skb); /* not ideal */
+
+ /*
+ * Frame length checks and setting up the header pointers
+ * was done in fcoe_rcv already.
+ */
+ hp = (struct fcoe_hdr *) skb_network_header(skb);
+ fh = (struct fc_frame_header *) skb_transport_header(skb);
+
+ stats = fc_lport_get_stats(lp);
+ if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
+ if (stats->ErrorFrames < 5)
+ printk(KERN_WARNING "FCoE version "
+ "mismatch: The frame has "
+ "version %x, but the "
+ "initiator supports version "
+ "%x\n", FC_FCOE_DECAPS_VER(hp),
+ FC_FCOE_VER);
+ stats->ErrorFrames++;
+ kfree_skb(skb);
+ continue;
+ }
+
+ skb_pull(skb, sizeof(struct fcoe_hdr));
+ fr_len = skb->len - sizeof(struct fcoe_crc_eof);
+
+ stats->RxFrames++;
+ stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
+
+ fp = (struct fc_frame *)skb;
+ fc_frame_init(fp);
+ fr_dev(fp) = lp;
+ fr_sof(fp) = hp->fcoe_sof;
+
+ /* Copy out the CRC and EOF trailer for access */
+ if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
+ kfree_skb(skb);
+ continue;
+ }
+ fr_eof(fp) = crc_eof.fcoe_eof;
+ fr_crc(fp) = crc_eof.fcoe_crc32;
+ if (pskb_trim(skb, fr_len)) {
+ kfree_skb(skb);
+ continue;
+ }
+
+ /*
+ * We only check CRC if no offload is available and if it is
+ * it's solicited data, in which case, the FCP layer would
+ * check it during the copy.
+ */
+ if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
+ fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
+ else
+ fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
+
+ fh = fc_frame_header_get(fp);
+ if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
+ fh->fh_type == FC_TYPE_FCP) {
+ fc_exch_recv(lp, lp->emp, fp);
+ continue;
+ }
+ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
+ if (le32_to_cpu(fr_crc(fp)) !=
+ ~crc32(~0, skb->data, fr_len)) {
+ if (debug_fcoe || stats->InvalidCRCCount < 5)
+ printk(KERN_WARNING "fcoe: dropping "
+ "frame with CRC error\n");
+ stats->InvalidCRCCount++;
+ stats->ErrorFrames++;
+ fc_frame_free(fp);
+ continue;
+ }
+ fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
+ }
+ /* non flogi and non data exchanges are handled here */
+ if (unlikely(fc->flogi_progress))
+ fcoe_recv_flogi(fc, fp, mac);
+ fc_exch_recv(lp, lp->emp, fp);
+ }
+ return 0;
+}
+
+/**
+ * fcoe_recv_flogi() - flogi receive function
+ * @fc: associated fcoe_softc
+ * @fp: the recieved frame
+ * @sa: the source address of this flogi
+ *
+ * This is responsible to parse the flogi response and sets the corresponding
+ * mac address for the initiator, eitehr OUI based or GW based.
+ *
+ * Returns: none
+ */
+static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
+{
+ struct fc_frame_header *fh;
+ u8 op;
+
+ fh = fc_frame_header_get(fp);
+ if (fh->fh_type != FC_TYPE_ELS)
+ return;
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
+ fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
+ /*
+ * FLOGI accepted.
+ * If the src mac addr is FC_OUI-based, then we mark the
+ * address_mode flag to use FC_OUI-based Ethernet DA.
+ * Otherwise we use the FCoE gateway addr
+ */
+ if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) {
+ fc->address_mode = FCOE_FCOUI_ADDR_MODE;
+ } else {
+ memcpy(fc->dest_addr, sa, ETH_ALEN);
+ fc->address_mode = FCOE_GW_ADDR_MODE;
+ }
+
+ /*
+ * Remove any previously-set unicast MAC filter.
+ * Add secondary FCoE MAC address filter for our OUI.
+ */
+ rtnl_lock();
+ if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
+ dev_unicast_delete(fc->real_dev, fc->data_src_addr,
+ ETH_ALEN);
+ fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
+ dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN);
+ rtnl_unlock();
+
+ fc->flogi_progress = 0;
+ } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
+ /*
+ * Save source MAC for point-to-point responses.
+ */
+ memcpy(fc->dest_addr, sa, ETH_ALEN);
+ fc->address_mode = FCOE_GW_ADDR_MODE;
+ }
+}
+
+/**
+ * fcoe_watchdog() - fcoe timer callback
+ * @vp:
+ *
+ * This checks the pending queue length for fcoe and set lport qfull
+ * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
+ * fcoe_hostlist.
+ *
+ * Returns: 0 for success
+ */
+void fcoe_watchdog(ulong vp)
+{
+ struct fcoe_softc *fc;
+
+ read_lock(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ if (fc->lp)
+ fcoe_check_wait_queue(fc->lp);
+ }
+ read_unlock(&fcoe_hostlist_lock);
+
+ fcoe_timer.expires = jiffies + (1 * HZ);
+ add_timer(&fcoe_timer);
+}
+
+
+/**
+ * fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue
+ * @lp: the fc_port for this skb
+ * @skb: the associated skb to be xmitted
+ *
+ * This empties the wait_queue, dequeue the head of the wait_queue queue
+ * and calls fcoe_start_io() for each packet, if all skb have been
+ * transmitted, return qlen or -1 if a error occurs, then restore
+ * wait_queue and try again later.
+ *
+ * The wait_queue is used when the skb transmit fails. skb will go
+ * in the wait_queue which will be emptied by the time function OR
+ * by the next skb transmit.
+ *
+ * Returns: 0 for success
+ */
+static int fcoe_check_wait_queue(struct fc_lport *lp)
+{
+ struct fcoe_softc *fc = lport_priv(lp);
+ struct sk_buff *skb;
+ int rc = -1;
+
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ if (fc->fcoe_pending_queue_active)
+ goto out;
+ fc->fcoe_pending_queue_active = 1;
+
+ while (fc->fcoe_pending_queue.qlen) {
+ /* keep qlen > 0 until fcoe_start_io succeeds */
+ fc->fcoe_pending_queue.qlen++;
+ skb = __skb_dequeue(&fc->fcoe_pending_queue);
+
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ rc = fcoe_start_io(skb);
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+
+ if (rc) {
+ __skb_queue_head(&fc->fcoe_pending_queue, skb);
+ /* undo temporary increment above */
+ fc->fcoe_pending_queue.qlen--;
+ break;
+ }
+ /* undo temporary increment above */
+ fc->fcoe_pending_queue.qlen--;
+ }
+
+ if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
+ lp->qfull = 0;
+ fc->fcoe_pending_queue_active = 0;
+ rc = fc->fcoe_pending_queue.qlen;
+out:
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ return rc;
+}
+
+/**
+ * fcoe_dev_setup() - setup link change notification interface
+ */
+static void fcoe_dev_setup()
+{
+ /*
+ * here setup a interface specific wd time to
+ * monitor the link state
+ */
+ register_netdevice_notifier(&fcoe_notifier);
+}
+
+/**
+ * fcoe_dev_setup() - cleanup link change notification interface
+ */
+static void fcoe_dev_cleanup(void)
+{
+ unregister_netdevice_notifier(&fcoe_notifier);
+}
+
+/**
+ * fcoe_device_notification() - netdev event notification callback
+ * @notifier: context of the notification
+ * @event: type of event
+ * @ptr: fixed array for output parsed ifname
+ *
+ * This function is called by the ethernet driver in case of link change event
+ *
+ * Returns: 0 for success
+ */
+static int fcoe_device_notification(struct notifier_block *notifier,
+ ulong event, void *ptr)
+{
+ struct fc_lport *lp = NULL;
+ struct net_device *real_dev = ptr;
+ struct fcoe_softc *fc;
+ struct fcoe_dev_stats *stats;
+ u32 new_link_up;
+ u32 mfs;
+ int rc = NOTIFY_OK;
+
+ read_lock(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ if (fc->real_dev == real_dev) {
+ lp = fc->lp;
+ break;
+ }
+ }
+ read_unlock(&fcoe_hostlist_lock);
+ if (lp == NULL) {
+ rc = NOTIFY_DONE;
+ goto out;
+ }
+
+ new_link_up = lp->link_up;
+ switch (event) {
+ case NETDEV_DOWN:
+ case NETDEV_GOING_DOWN:
+ new_link_up = 0;
+ break;
+ case NETDEV_UP:
+ case NETDEV_CHANGE:
+ new_link_up = !fcoe_link_ok(lp);
+ break;
+ case NETDEV_CHANGEMTU:
+ mfs = fc->real_dev->mtu -
+ (sizeof(struct fcoe_hdr) +
+ sizeof(struct fcoe_crc_eof));
+ if (mfs >= FC_MIN_MAX_FRAME)
+ fc_set_mfs(lp, mfs);
+ new_link_up = !fcoe_link_ok(lp);
+ break;
+ case NETDEV_REGISTER:
+ break;
+ default:
+ FC_DBG("unknown event %ld call", event);
+ }
+ if (lp->link_up != new_link_up) {
+ if (new_link_up)
+ fc_linkup(lp);
+ else {
+ stats = fc_lport_get_stats(lp);
+ stats->LinkFailureCount++;
+ fc_linkdown(lp);
+ fcoe_clean_pending_queue(lp);
+ }
+ }
+out:
+ return rc;
+}
+
+/**
+ * fcoe_if_to_netdev() - parse a name buffer to get netdev
+ * @ifname: fixed array for output parsed ifname
+ * @buffer: incoming buffer to be copied
+ *
+ * Returns: NULL or ptr to netdeive
+ */
+static struct net_device *fcoe_if_to_netdev(const char *buffer)
+{
+ char *cp;
+ char ifname[IFNAMSIZ + 2];
+
+ if (buffer) {
+ strlcpy(ifname, buffer, IFNAMSIZ);
+ cp = ifname + strlen(ifname);
+ while (--cp >= ifname && *cp == '\n')
+ *cp = '\0';
+ return dev_get_by_name(&init_net, ifname);
+ }
+ return NULL;
+}
+
+/**
+ * fcoe_netdev_to_module_owner() - finds out the nic drive moddule of the netdev
+ * @netdev: the target netdev
+ *
+ * Returns: ptr to the struct module, NULL for failure
+ */
+static struct module *
+fcoe_netdev_to_module_owner(const struct net_device *netdev)
+{
+ struct device *dev;
+
+ if (!netdev)
+ return NULL;
+
+ dev = netdev->dev.parent;
+ if (!dev)
+ return NULL;
+
+ if (!dev->driver)
+ return NULL;
+
+ return dev->driver->owner;
+}
+
+/**
+ * fcoe_ethdrv_get() - Hold the Ethernet driver
+ * @netdev: the target netdev
+ *
+ * Holds the Ethernet driver module by try_module_get() for
+ * the corresponding netdev.
+ *
+ * Returns: 0 for succsss
+ */
+static int fcoe_ethdrv_get(const struct net_device *netdev)
+{
+ struct module *owner;
+
+ owner = fcoe_netdev_to_module_owner(netdev);
+ if (owner) {
+ printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n",
+ module_name(owner), netdev->name);
+ return try_module_get(owner);
+ }
+ return -ENODEV;
+}
+
+/**
+ * fcoe_ethdrv_put() - Release the Ethernet driver
+ * @netdev: the target netdev
+ *
+ * Releases the Ethernet driver module by module_put for
+ * the corresponding netdev.
+ *
+ * Returns: 0 for succsss
+ */
+static int fcoe_ethdrv_put(const struct net_device *netdev)
+{
+ struct module *owner;
+
+ owner = fcoe_netdev_to_module_owner(netdev);
+ if (owner) {
+ printk(KERN_DEBUG "fcoe:release driver module %s for %s\n",
+ module_name(owner), netdev->name);
+ module_put(owner);
+ return 0;
+ }
+ return -ENODEV;
+}
+
+/**
+ * fcoe_destroy() - handles the destroy from sysfs
+ * @buffer: expcted to be a eth if name
+ * @kp: associated kernel param
+ *
+ * Returns: 0 for success
+ */
+static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
+{
+ int rc;
+ struct net_device *netdev;
+
+ netdev = fcoe_if_to_netdev(buffer);
+ if (!netdev) {
+ rc = -ENODEV;
+ goto out_nodev;
+ }
+ /* look for existing lport */
+ if (!fcoe_hostlist_lookup(netdev)) {
+ rc = -ENODEV;
+ goto out_putdev;
+ }
+ rc = fcoe_if_destroy(netdev);
+ if (rc) {
+ printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n",
+ netdev->name);
+ rc = -EIO;
+ goto out_putdev;
+ }
+ fcoe_ethdrv_put(netdev);
+ rc = 0;
+out_putdev:
+ dev_put(netdev);
+out_nodev:
+ return rc;
+}
+
+/**
+ * fcoe_create() - Handles the create call from sysfs
+ * @buffer: expcted to be a eth if name
+ * @kp: associated kernel param
+ *
+ * Returns: 0 for success
+ */
+static int fcoe_create(const char *buffer, struct kernel_param *kp)
+{
+ int rc;
+ struct net_device *netdev;
+
+ netdev = fcoe_if_to_netdev(buffer);
+ if (!netdev) {
+ rc = -ENODEV;
+ goto out_nodev;
+ }
+ /* look for existing lport */
+ if (fcoe_hostlist_lookup(netdev)) {
+ rc = -EEXIST;
+ goto out_putdev;
+ }
+ fcoe_ethdrv_get(netdev);
+
+ rc = fcoe_if_create(netdev);
+ if (rc) {
+ printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n",
+ netdev->name);
+ fcoe_ethdrv_put(netdev);
+ rc = -EIO;
+ goto out_putdev;
+ }
+ rc = 0;
+out_putdev:
+ dev_put(netdev);
+out_nodev:
+ return rc;
+}
+
+module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
+__MODULE_PARM_TYPE(create, "string");
+MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
+module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
+__MODULE_PARM_TYPE(destroy, "string");
+MODULE_PARM_DESC(destroy, "Destroy fcoe port");
+
+/**
+ * fcoe_link_ok() - Check if link is ok for the fc_lport
+ * @lp: ptr to the fc_lport
+ *
+ * Any permanently-disqualifying conditions have been previously checked.
+ * This also updates the speed setting, which may change with link for 100/1000.
+ *
+ * This function should probably be checking for PAUSE support at some point
+ * in the future. Currently Per-priority-pause is not determinable using
+ * ethtool, so we shouldn't be restrictive until that problem is resolved.
+ *
+ * Returns: 0 if link is OK for use by FCoE.
+ *
+ */
+int fcoe_link_ok(struct fc_lport *lp)
+{
+ struct fcoe_softc *fc = lport_priv(lp);
+ struct net_device *dev = fc->real_dev;
+ struct ethtool_cmd ecmd = { ETHTOOL_GSET };
+ int rc = 0;
+
+ if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
+ dev = fc->phys_dev;
+ if (dev->ethtool_ops->get_settings) {
+ dev->ethtool_ops->get_settings(dev, &ecmd);
+ lp->link_supported_speeds &=
+ ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
+ if (ecmd.supported & (SUPPORTED_1000baseT_Half |
+ SUPPORTED_1000baseT_Full))
+ lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
+ if (ecmd.supported & SUPPORTED_10000baseT_Full)
+ lp->link_supported_speeds |=
+ FC_PORTSPEED_10GBIT;
+ if (ecmd.speed == SPEED_1000)
+ lp->link_speed = FC_PORTSPEED_1GBIT;
+ if (ecmd.speed == SPEED_10000)
+ lp->link_speed = FC_PORTSPEED_10GBIT;
+ }
+ } else
+ rc = -1;
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(fcoe_link_ok);
+
+/**
+ * fcoe_percpu_clean() - Clear the pending skbs for an lport
+ * @lp: the fc_lport
+ */
+void fcoe_percpu_clean(struct fc_lport *lp)
+{
+ struct fcoe_percpu_s *pp;
+ struct fcoe_rcv_info *fr;
+ struct sk_buff_head *list;
+ struct sk_buff *skb, *next;
+ struct sk_buff *head;
+ unsigned int cpu;
+
+ for_each_possible_cpu(cpu) {
+ pp = &per_cpu(fcoe_percpu, cpu);
+ spin_lock_bh(&pp->fcoe_rx_list.lock);
+ list = &pp->fcoe_rx_list;
+ head = list->next;
+ for (skb = head; skb != (struct sk_buff *)list;
+ skb = next) {
+ next = skb->next;
+ fr = fcoe_dev_from_skb(skb);
+ if (fr->fr_dev == lp) {
+ __skb_unlink(skb, list);
+ kfree_skb(skb);
+ }
+ }
+ spin_unlock_bh(&pp->fcoe_rx_list.lock);
+ }
+}
+EXPORT_SYMBOL_GPL(fcoe_percpu_clean);
+
+/**
+ * fcoe_clean_pending_queue() - Dequeue a skb and free it
+ * @lp: the corresponding fc_lport
+ *
+ * Returns: none
+ */
+void fcoe_clean_pending_queue(struct fc_lport *lp)
+{
+ struct fcoe_softc *fc = lport_priv(lp);
+ struct sk_buff *skb;
+
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ kfree_skb(skb);
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ }
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+}
+EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
+
+/**
+ * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
+ * @sht: ptr to the scsi host templ
+ * @priv_size: size of private data after fc_lport
+ *
+ * Returns: ptr to Scsi_Host
+ * TODO: to libfc?
+ */
+static inline struct Scsi_Host *
+libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
+{
+ return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
+}
+
+/**
+ * fcoe_host_alloc() - Allocate a Scsi_Host with room for the fcoe_softc
+ * @sht: ptr to the scsi host templ
+ * @priv_size: size of private data after fc_lport
+ *
+ * Returns: ptr to Scsi_Host
+ */
+struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size)
+{
+ return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size);
+}
+EXPORT_SYMBOL_GPL(fcoe_host_alloc);
+
+/**
+ * fcoe_reset() - Resets the fcoe
+ * @shost: shost the reset is from
+ *
+ * Returns: always 0
+ */
+int fcoe_reset(struct Scsi_Host *shost)
+{
+ struct fc_lport *lport = shost_priv(shost);
+ fc_lport_reset(lport);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_reset);
+
+/**
+ * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
+ * @mac: mac address
+ * @scheme: check port
+ * @port: port indicator for converting
+ *
+ * Returns: u64 fc world wide name
+ */
+u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
+ unsigned int scheme, unsigned int port)
+{
+ u64 wwn;
+ u64 host_mac;
+
+ /* The MAC is in NO, so flip only the low 48 bits */
+ host_mac = ((u64) mac[0] << 40) |
+ ((u64) mac[1] << 32) |
+ ((u64) mac[2] << 24) |
+ ((u64) mac[3] << 16) |
+ ((u64) mac[4] << 8) |
+ (u64) mac[5];
+
+ WARN_ON(host_mac >= (1ULL << 48));
+ wwn = host_mac | ((u64) scheme << 60);
+ switch (scheme) {
+ case 1:
+ WARN_ON(port != 0);
+ break;
+ case 2:
+ WARN_ON(port >= 0xfff);
+ wwn |= (u64) port << 48;
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+
+ return wwn;
+}
+EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
+
+/**
+ * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
+ * @device: this is currently ptr to net_device
+ *
+ * Returns: NULL or the located fcoe_softc
+ */
+static struct fcoe_softc *
+fcoe_hostlist_lookup_softc(const struct net_device *dev)
+{
+ struct fcoe_softc *fc;
+
+ read_lock(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ if (fc->real_dev == dev) {
+ read_unlock(&fcoe_hostlist_lock);
+ return fc;
+ }
+ }
+ read_unlock(&fcoe_hostlist_lock);
+ return NULL;
+}
+
+/**
+ * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
+ * @netdev: ptr to net_device
+ *
+ * Returns: 0 for success
+ */
+struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
+{
+ struct fcoe_softc *fc;
+
+ fc = fcoe_hostlist_lookup_softc(netdev);
+
+ return (fc) ? fc->lp : NULL;
+}
+EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);
+
+/**
+ * fcoe_hostlist_add() - Add a lport to lports list
+ * @lp: ptr to the fc_lport to badded
+ *
+ * Returns: 0 for success
+ */
+int fcoe_hostlist_add(const struct fc_lport *lp)
+{
+ struct fcoe_softc *fc;
+
+ fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
+ if (!fc) {
+ fc = lport_priv(lp);
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_add_tail(&fc->list, &fcoe_hostlist);
+ write_unlock_bh(&fcoe_hostlist_lock);
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_hostlist_add);
+
+/**
+ * fcoe_hostlist_remove() - remove a lport from lports list
+ * @lp: ptr to the fc_lport to badded
+ *
+ * Returns: 0 for success
+ */
+int fcoe_hostlist_remove(const struct fc_lport *lp)
+{
+ struct fcoe_softc *fc;
+
+ fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
+ BUG_ON(!fc);
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_del(&fc->list);
+ write_unlock_bh(&fcoe_hostlist_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_hostlist_remove);
+
+/**
+ * fcoe_libfc_config() - sets up libfc related properties for lport
+ * @lp: ptr to the fc_lport
+ * @tt: libfc function template
+ *
+ * Returns : 0 for success
+ */
+int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
+{
+ /* Set the function pointers set by the LLDD */
+ memcpy(&lp->tt, tt, sizeof(*tt));
+ if (fc_fcp_init(lp))
+ return -ENOMEM;
+ fc_exch_init(lp);
+ fc_elsct_init(lp);
+ fc_lport_init(lp);
+ fc_rport_init(lp);
+ fc_disc_init(lp);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fcoe_libfc_config);
+
+/**
+ * fcoe_init() - fcoe module loading initialization
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int __init fcoe_init(void)
+{
+ unsigned int cpu;
+ int rc = 0;
+ struct fcoe_percpu_s *p;
+
+ INIT_LIST_HEAD(&fcoe_hostlist);
+ rwlock_init(&fcoe_hostlist_lock);
+
+ for_each_possible_cpu(cpu) {
+ p = &per_cpu(fcoe_percpu, cpu);
+ skb_queue_head_init(&p->fcoe_rx_list);
+ }
+
+ for_each_online_cpu(cpu)
+ fcoe_percpu_thread_create(cpu);
+
+ /* Initialize per CPU interrupt thread */
+ rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
+ if (rc)
+ goto out_free;
+
+ /* Setup link change notification */
+ fcoe_dev_setup();
+
+ setup_timer(&fcoe_timer, fcoe_watchdog, 0);
+
+ mod_timer(&fcoe_timer, jiffies + (10 * HZ));
+
+ fcoe_if_init();
+
+ return 0;
+
+out_free:
+ for_each_online_cpu(cpu) {
+ fcoe_percpu_thread_destroy(cpu);
+ }
+
+ return rc;
+}
+module_init(fcoe_init);
+
+/**
+ * fcoe_exit() - fcoe module unloading cleanup
+ *
+ * Returns 0 on success, negative on failure
+ */
+static void __exit fcoe_exit(void)
+{
+ unsigned int cpu;
+ struct fcoe_softc *fc, *tmp;
+
+ fcoe_dev_cleanup();
+
+ /* Stop the timer */
+ del_timer_sync(&fcoe_timer);
+
+ /* releases the associated fcoe hosts */
+ list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
+ fcoe_if_destroy(fc->real_dev);
+
+ unregister_hotcpu_notifier(&fcoe_cpu_notifier);
+
+ for_each_online_cpu(cpu) {
+ fcoe_percpu_thread_destroy(cpu);
+ }
+
+ /* detach from scsi transport */
+ fcoe_if_exit();
+}
+module_exit(fcoe_exit);
+++ /dev/null
-/*
- * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Maintained at www.Open-FCoE.org
- */
-
-#include <linux/module.h>
-#include <linux/version.h>
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-#include <linux/skbuff.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/ethtool.h>
-#include <linux/if_ether.h>
-#include <linux/if_vlan.h>
-#include <linux/kthread.h>
-#include <linux/crc32.h>
-#include <linux/cpu.h>
-#include <linux/fs.h>
-#include <linux/sysfs.h>
-#include <linux/ctype.h>
-#include <scsi/scsi_tcq.h>
-#include <scsi/scsicam.h>
-#include <scsi/scsi_transport.h>
-#include <scsi/scsi_transport_fc.h>
-#include <net/rtnetlink.h>
-
-#include <scsi/fc/fc_encaps.h>
-
-#include <scsi/libfc.h>
-#include <scsi/fc_frame.h>
-#include <scsi/libfcoe.h>
-
-static int debug_fcoe;
-
-#define FCOE_MAX_QUEUE_DEPTH 256
-#define FCOE_LOW_QUEUE_DEPTH 32
-
-/* destination address mode */
-#define FCOE_GW_ADDR_MODE 0x00
-#define FCOE_FCOUI_ADDR_MODE 0x01
-
-#define FCOE_WORD_TO_BYTE 4
-
-#define FCOE_VERSION "0.1"
-#define FCOE_NAME "fcoe"
-#define FCOE_VENDOR "Open-FCoE.org"
-
-#define FCOE_MAX_LUN 255
-#define FCOE_MAX_FCP_TARGET 256
-
-#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
-
-#define FCOE_MIN_XID 0x0001 /* the min xid supported by fcoe_sw */
-#define FCOE_MAX_XID 0x07ef /* the max xid supported by fcoe_sw */
-
-MODULE_AUTHOR("Open-FCoE.org");
-MODULE_DESCRIPTION("FCoE");
-MODULE_LICENSE("GPL");
-
-/* fcoe host list */
-LIST_HEAD(fcoe_hostlist);
-DEFINE_RWLOCK(fcoe_hostlist_lock);
-DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
-DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
-
-
-/* Function Prototyes */
-static int fcoe_check_wait_queue(struct fc_lport *);
-static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
-static int fcoe_device_notification(struct notifier_block *, ulong, void *);
-static void fcoe_dev_setup(void);
-static void fcoe_dev_cleanup(void);
-
-/* notification function from net device */
-static struct notifier_block fcoe_notifier = {
- .notifier_call = fcoe_device_notification,
-};
-
-static struct scsi_transport_template *scsi_transport_fcoe_sw;
-
-struct fc_function_template fcoe_transport_function = {
- .show_host_node_name = 1,
- .show_host_port_name = 1,
- .show_host_supported_classes = 1,
- .show_host_supported_fc4s = 1,
- .show_host_active_fc4s = 1,
- .show_host_maxframe_size = 1,
-
- .show_host_port_id = 1,
- .show_host_supported_speeds = 1,
- .get_host_speed = fc_get_host_speed,
- .show_host_speed = 1,
- .show_host_port_type = 1,
- .get_host_port_state = fc_get_host_port_state,
- .show_host_port_state = 1,
- .show_host_symbolic_name = 1,
-
- .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
- .show_rport_maxframe_size = 1,
- .show_rport_supported_classes = 1,
-
- .show_host_fabric_name = 1,
- .show_starget_node_name = 1,
- .show_starget_port_name = 1,
- .show_starget_port_id = 1,
- .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
- .show_rport_dev_loss_tmo = 1,
- .get_fc_host_stats = fc_get_host_stats,
- .issue_fc_host_lip = fcoe_reset,
-
- .terminate_rport_io = fc_rport_terminate_io,
-};
-
-static struct scsi_host_template fcoe_shost_template = {
- .module = THIS_MODULE,
- .name = "FCoE Driver",
- .proc_name = FCOE_NAME,
- .queuecommand = fc_queuecommand,
- .eh_abort_handler = fc_eh_abort,
- .eh_device_reset_handler = fc_eh_device_reset,
- .eh_host_reset_handler = fc_eh_host_reset,
- .slave_alloc = fc_slave_alloc,
- .change_queue_depth = fc_change_queue_depth,
- .change_queue_type = fc_change_queue_type,
- .this_id = -1,
- .cmd_per_lun = 32,
- .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
- .use_clustering = ENABLE_CLUSTERING,
- .sg_tablesize = SG_ALL,
- .max_sectors = 0xffff,
-};
-
-/**
- * fcoe_lport_config() - sets up the fc_lport
- * @lp: ptr to the fc_lport
- * @shost: ptr to the parent scsi host
- *
- * Returns: 0 for success
- */
-static int fcoe_lport_config(struct fc_lport *lp)
-{
- lp->link_up = 0;
- lp->qfull = 0;
- lp->max_retry_count = 3;
- lp->e_d_tov = 2 * 1000; /* FC-FS default */
- lp->r_a_tov = 2 * 2 * 1000;
- lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
- FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
-
- fc_lport_init_stats(lp);
-
- /* lport fc_lport related configuration */
- fc_lport_config(lp);
-
- /* offload related configuration */
- lp->crc_offload = 0;
- lp->seq_offload = 0;
- lp->lro_enabled = 0;
- lp->lro_xid = 0;
- lp->lso_max = 0;
-
- return 0;
-}
-
-/**
- * fcoe_netdev_config() - Set up netdev for SW FCoE
- * @lp : ptr to the fc_lport
- * @netdev : ptr to the associated netdevice struct
- *
- * Must be called after fcoe_lport_config() as it will use lport mutex
- *
- * Returns : 0 for success
- */
-static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev)
-{
- u32 mfs;
- u64 wwnn, wwpn;
- struct fcoe_softc *fc;
- u8 flogi_maddr[ETH_ALEN];
-
- /* Setup lport private data to point to fcoe softc */
- fc = lport_priv(lp);
- fc->lp = lp;
- fc->real_dev = netdev;
- fc->phys_dev = netdev;
-
- /* Require support for get_pauseparam ethtool op. */
- if (netdev->priv_flags & IFF_802_1Q_VLAN)
- fc->phys_dev = vlan_dev_real_dev(netdev);
-
- /* Do not support for bonding device */
- if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) ||
- (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) ||
- (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) {
- return -EOPNOTSUPP;
- }
-
- /*
- * Determine max frame size based on underlying device and optional
- * user-configured limit. If the MFS is too low, fcoe_link_ok()
- * will return 0, so do this first.
- */
- mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) +
- sizeof(struct fcoe_crc_eof));
- if (fc_set_mfs(lp, mfs))
- return -EINVAL;
-
- if (!fcoe_link_ok(lp))
- lp->link_up = 1;
-
- /* offload features support */
- if (fc->real_dev->features & NETIF_F_SG)
- lp->sg_supp = 1;
-
-#ifdef NETIF_F_FCOE_CRC
- if (netdev->features & NETIF_F_FCOE_CRC) {
- lp->crc_offload = 1;
- printk(KERN_DEBUG "fcoe:%s supports FCCRC offload\n",
- netdev->name);
- }
-#endif
-#ifdef NETIF_F_FSO
- if (netdev->features & NETIF_F_FSO) {
- lp->seq_offload = 1;
- lp->lso_max = netdev->gso_max_size;
- printk(KERN_DEBUG "fcoe:%s supports LSO for max len 0x%x\n",
- netdev->name, lp->lso_max);
- }
-#endif
- if (netdev->fcoe_ddp_xid) {
- lp->lro_enabled = 1;
- lp->lro_xid = netdev->fcoe_ddp_xid;
- printk(KERN_DEBUG "fcoe:%s supports LRO for max xid 0x%x\n",
- netdev->name, lp->lro_xid);
- }
- skb_queue_head_init(&fc->fcoe_pending_queue);
- fc->fcoe_pending_queue_active = 0;
-
- /* setup Source Mac Address */
- memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr,
- fc->real_dev->addr_len);
-
- wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
- fc_set_wwnn(lp, wwnn);
- /* XXX - 3rd arg needs to be vlan id */
- wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0);
- fc_set_wwpn(lp, wwpn);
-
- /*
- * Add FCoE MAC address as second unicast MAC address
- * or enter promiscuous mode if not capable of listening
- * for multiple unicast MACs.
- */
- rtnl_lock();
- memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
- dev_unicast_add(fc->real_dev, flogi_maddr, ETH_ALEN);
- rtnl_unlock();
-
- /*
- * setup the receive function from ethernet driver
- * on the ethertype for the given device
- */
- fc->fcoe_packet_type.func = fcoe_rcv;
- fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
- fc->fcoe_packet_type.dev = fc->real_dev;
- dev_add_pack(&fc->fcoe_packet_type);
-
- return 0;
-}
-
-/**
- * fcoe_shost_config() - Sets up fc_lport->host
- * @lp : ptr to the fc_lport
- * @shost : ptr to the associated scsi host
- * @dev : device associated to scsi host
- *
- * Must be called after fcoe_lport_config() and fcoe_netdev_config()
- *
- * Returns : 0 for success
- */
-static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost,
- struct device *dev)
-{
- int rc = 0;
-
- /* lport scsi host config */
- lp->host = shost;
-
- lp->host->max_lun = FCOE_MAX_LUN;
- lp->host->max_id = FCOE_MAX_FCP_TARGET;
- lp->host->max_channel = 0;
- lp->host->transportt = scsi_transport_fcoe_sw;
-
- /* add the new host to the SCSI-ml */
- rc = scsi_add_host(lp->host, dev);
- if (rc) {
- FC_DBG("fcoe_shost_config:error on scsi_add_host\n");
- return rc;
- }
- sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
- FCOE_NAME, FCOE_VERSION,
- fcoe_netdev(lp)->name);
-
- return 0;
-}
-
-/**
- * fcoe_em_config() - allocates em for this lport
- * @lp: the port that em is to allocated for
- *
- * Returns : 0 on success
- */
-static inline int fcoe_em_config(struct fc_lport *lp)
-{
- BUG_ON(lp->emp);
-
- lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3,
- FCOE_MIN_XID, FCOE_MAX_XID);
- if (!lp->emp)
- return -ENOMEM;
-
- return 0;
-}
-
-/**
- * fcoe_if_destroy() - FCoE software HBA tear-down function
- * @netdev: ptr to the associated net_device
- *
- * Returns: 0 if link is OK for use by FCoE.
- */
-static int fcoe_if_destroy(struct net_device *netdev)
-{
- struct fc_lport *lp = NULL;
- struct fcoe_softc *fc;
- u8 flogi_maddr[ETH_ALEN];
-
- BUG_ON(!netdev);
-
- printk(KERN_DEBUG "fcoe_if_destroy:interface on %s\n",
- netdev->name);
-
- lp = fcoe_hostlist_lookup(netdev);
- if (!lp)
- return -ENODEV;
-
- fc = lport_priv(lp);
-
- /* Logout of the fabric */
- fc_fabric_logoff(lp);
-
- /* Remove the instance from fcoe's list */
- fcoe_hostlist_remove(lp);
-
- /* Don't listen for Ethernet packets anymore */
- dev_remove_pack(&fc->fcoe_packet_type);
-
- /* Cleanup the fc_lport */
- fc_lport_destroy(lp);
- fc_fcp_destroy(lp);
-
- /* Detach from the scsi-ml */
- fc_remove_host(lp->host);
- scsi_remove_host(lp->host);
-
- /* There are no more rports or I/O, free the EM */
- if (lp->emp)
- fc_exch_mgr_free(lp->emp);
-
- /* Delete secondary MAC addresses */
- rtnl_lock();
- memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
- dev_unicast_delete(fc->real_dev, flogi_maddr, ETH_ALEN);
- if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
- dev_unicast_delete(fc->real_dev, fc->data_src_addr, ETH_ALEN);
- rtnl_unlock();
-
- /* Free the per-CPU revieve threads */
- fcoe_percpu_clean(lp);
-
- /* Free existing skbs */
- fcoe_clean_pending_queue(lp);
-
- /* Free memory used by statistical counters */
- fc_lport_free_stats(lp);
-
- /* Release the net_device and Scsi_Host */
- dev_put(fc->real_dev);
- scsi_host_put(lp->host);
-
- return 0;
-}
-
-/*
- * fcoe_ddp_setup - calls LLD's ddp_setup through net_device
- * @lp: the corresponding fc_lport
- * @xid: the exchange id for this ddp transfer
- * @sgl: the scatterlist describing this transfer
- * @sgc: number of sg items
- *
- * Returns : 0 no ddp
- */
-static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid,
- struct scatterlist *sgl, unsigned int sgc)
-{
- struct net_device *n = fcoe_netdev(lp);
-
- if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_setup)
- return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc);
-
- return 0;
-}
-
-/*
- * fcoe_ddp_done - calls LLD's ddp_done through net_device
- * @lp: the corresponding fc_lport
- * @xid: the exchange id for this ddp transfer
- *
- * Returns : the length of data that have been completed by ddp
- */
-static int fcoe_ddp_done(struct fc_lport *lp, u16 xid)
-{
- struct net_device *n = fcoe_netdev(lp);
-
- if (n->netdev_ops && n->netdev_ops->ndo_fcoe_ddp_done)
- return n->netdev_ops->ndo_fcoe_ddp_done(n, xid);
- return 0;
-}
-
-static struct libfc_function_template fcoe_libfc_fcn_templ = {
- .frame_send = fcoe_xmit,
- .ddp_setup = fcoe_ddp_setup,
- .ddp_done = fcoe_ddp_done,
-};
-
-/**
- * fcoe_if_create() - this function creates the fcoe interface
- * @netdev: pointer the associated netdevice
- *
- * Creates fc_lport struct and scsi_host for lport, configures lport
- * and starts fabric login.
- *
- * Returns : 0 on success
- */
-static int fcoe_if_create(struct net_device *netdev)
-{
- int rc;
- struct fc_lport *lp = NULL;
- struct fcoe_softc *fc;
- struct Scsi_Host *shost;
-
- BUG_ON(!netdev);
-
- printk(KERN_DEBUG "fcoe_if_create:interface on %s\n",
- netdev->name);
-
- lp = fcoe_hostlist_lookup(netdev);
- if (lp)
- return -EEXIST;
-
- shost = fcoe_host_alloc(&fcoe_shost_template,
- sizeof(struct fcoe_softc));
- if (!shost) {
- FC_DBG("Could not allocate host structure\n");
- return -ENOMEM;
- }
- lp = shost_priv(shost);
- fc = lport_priv(lp);
-
- /* configure fc_lport, e.g., em */
- rc = fcoe_lport_config(lp);
- if (rc) {
- FC_DBG("Could not configure lport\n");
- goto out_host_put;
- }
-
- /* configure lport network properties */
- rc = fcoe_netdev_config(lp, netdev);
- if (rc) {
- FC_DBG("Could not configure netdev for lport\n");
- goto out_host_put;
- }
-
- /* configure lport scsi host properties */
- rc = fcoe_shost_config(lp, shost, &netdev->dev);
- if (rc) {
- FC_DBG("Could not configure shost for lport\n");
- goto out_host_put;
- }
-
- /* lport exch manager allocation */
- rc = fcoe_em_config(lp);
- if (rc) {
- FC_DBG("Could not configure em for lport\n");
- goto out_host_put;
- }
-
- /* Initialize the library */
- rc = fcoe_libfc_config(lp, &fcoe_libfc_fcn_templ);
- if (rc) {
- FC_DBG("Could not configure libfc for lport!\n");
- goto out_lp_destroy;
- }
-
- /* add to lports list */
- fcoe_hostlist_add(lp);
-
- lp->boot_time = jiffies;
-
- fc_fabric_login(lp);
-
- dev_hold(netdev);
-
- return rc;
-
-out_lp_destroy:
- fc_exch_mgr_free(lp->emp); /* Free the EM */
-out_host_put:
- scsi_host_put(lp->host);
- return rc;
-}
-
-/**
- * fcoe_if_init() - attach to scsi transport
- *
- * Returns : 0 on success
- */
-static int __init fcoe_if_init(void)
-{
- /* attach to scsi transport */
- scsi_transport_fcoe_sw =
- fc_attach_transport(&fcoe_transport_function);
-
- if (!scsi_transport_fcoe_sw) {
- printk(KERN_ERR "fcoe_init:fc_attach_transport() failed\n");
- return -ENODEV;
- }
-
- return 0;
-}
-
-/**
- * fcoe_if_exit() - detach from scsi transport
- *
- * Returns : 0 on success
- */
-int __exit fcoe_if_exit(void)
-{
- fc_release_transport(scsi_transport_fcoe_sw);
- return 0;
-}
-
-/**
- * fcoe_percpu_thread_create() - Create a receive thread for an online cpu
- * @cpu: cpu index for the online cpu
- */
-static void fcoe_percpu_thread_create(unsigned int cpu)
-{
- struct fcoe_percpu_s *p;
- struct task_struct *thread;
-
- p = &per_cpu(fcoe_percpu, cpu);
-
- thread = kthread_create(fcoe_percpu_receive_thread,
- (void *)p, "fcoethread/%d", cpu);
-
- if (likely(!IS_ERR(p->thread))) {
- kthread_bind(thread, cpu);
- wake_up_process(thread);
-
- spin_lock_bh(&p->fcoe_rx_list.lock);
- p->thread = thread;
- spin_unlock_bh(&p->fcoe_rx_list.lock);
- }
-}
-
-/**
- * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu
- * @cpu: cpu index the rx thread is to be removed
- *
- * Destroys a per-CPU Rx thread. Any pending skbs are moved to the
- * current CPU's Rx thread. If the thread being destroyed is bound to
- * the CPU processing this context the skbs will be freed.
- */
-static void fcoe_percpu_thread_destroy(unsigned int cpu)
-{
- struct fcoe_percpu_s *p;
- struct task_struct *thread;
- struct page *crc_eof;
- struct sk_buff *skb;
-#ifdef CONFIG_SMP
- struct fcoe_percpu_s *p0;
- unsigned targ_cpu = smp_processor_id();
-#endif /* CONFIG_SMP */
-
- printk(KERN_DEBUG "fcoe: Destroying receive thread for CPU %d\n", cpu);
-
- /* Prevent any new skbs from being queued for this CPU. */
- p = &per_cpu(fcoe_percpu, cpu);
- spin_lock_bh(&p->fcoe_rx_list.lock);
- thread = p->thread;
- p->thread = NULL;
- crc_eof = p->crc_eof_page;
- p->crc_eof_page = NULL;
- p->crc_eof_offset = 0;
- spin_unlock_bh(&p->fcoe_rx_list.lock);
-
-#ifdef CONFIG_SMP
- /*
- * Don't bother moving the skb's if this context is running
- * on the same CPU that is having its thread destroyed. This
- * can easily happen when the module is removed.
- */
- if (cpu != targ_cpu) {
- p0 = &per_cpu(fcoe_percpu, targ_cpu);
- spin_lock_bh(&p0->fcoe_rx_list.lock);
- if (p0->thread) {
- FC_DBG("Moving frames from CPU %d to CPU %d\n",
- cpu, targ_cpu);
-
- while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
- __skb_queue_tail(&p0->fcoe_rx_list, skb);
- spin_unlock_bh(&p0->fcoe_rx_list.lock);
- } else {
- /*
- * The targeted CPU is not initialized and cannot accept
- * new skbs. Unlock the targeted CPU and drop the skbs
- * on the CPU that is going offline.
- */
- while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
- kfree_skb(skb);
- spin_unlock_bh(&p0->fcoe_rx_list.lock);
- }
- } else {
- /*
- * This scenario occurs when the module is being removed
- * and all threads are being destroyed. skbs will continue
- * to be shifted from the CPU thread that is being removed
- * to the CPU thread associated with the CPU that is processing
- * the module removal. Once there is only one CPU Rx thread it
- * will reach this case and we will drop all skbs and later
- * stop the thread.
- */
- spin_lock_bh(&p->fcoe_rx_list.lock);
- while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
- kfree_skb(skb);
- spin_unlock_bh(&p->fcoe_rx_list.lock);
- }
-#else
- /*
- * This a non-SMP scenario where the singluar Rx thread is
- * being removed. Free all skbs and stop the thread.
- */
- spin_lock_bh(&p->fcoe_rx_list.lock);
- while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
- kfree_skb(skb);
- spin_unlock_bh(&p->fcoe_rx_list.lock);
-#endif
-
- if (thread)
- kthread_stop(thread);
-
- if (crc_eof)
- put_page(crc_eof);
-}
-
-/**
- * fcoe_cpu_callback() - fcoe cpu hotplug event callback
- * @nfb: callback data block
- * @action: event triggering the callback
- * @hcpu: index for the cpu of this event
- *
- * This creates or destroys per cpu data for fcoe
- *
- * Returns NOTIFY_OK always.
- */
-static int fcoe_cpu_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- unsigned cpu = (unsigned long)hcpu;
-
- switch (action) {
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- FC_DBG("CPU %x online: Create Rx thread\n", cpu);
- fcoe_percpu_thread_create(cpu);
- break;
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
- FC_DBG("CPU %x offline: Remove Rx thread\n", cpu);
- fcoe_percpu_thread_destroy(cpu);
- break;
- default:
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block fcoe_cpu_notifier = {
- .notifier_call = fcoe_cpu_callback,
-};
-
-/**
- * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ
- * @skb: the receive skb
- * @dev: associated net device
- * @ptype: context
- * @odldev: last device
- *
- * this function will receive the packet and build fc frame and pass it up
- *
- * Returns: 0 for success
- */
-int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *ptype, struct net_device *olddev)
-{
- struct fc_lport *lp;
- struct fcoe_rcv_info *fr;
- struct fcoe_softc *fc;
- struct fc_frame_header *fh;
- struct fcoe_percpu_s *fps;
- unsigned short oxid;
- unsigned int cpu = 0;
-
- fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
- lp = fc->lp;
- if (unlikely(lp == NULL)) {
- FC_DBG("cannot find hba structure");
- goto err2;
- }
-
- if (unlikely(debug_fcoe)) {
- FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
- "end:%p sum:%d dev:%s", skb->len, skb->data_len,
- skb->head, skb->data, skb_tail_pointer(skb),
- skb_end_pointer(skb), skb->csum,
- skb->dev ? skb->dev->name : "<NULL>");
-
- }
-
- /* check for FCOE packet type */
- if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
- FC_DBG("wrong FC type frame");
- goto err;
- }
-
- /*
- * Check for minimum frame length, and make sure required FCoE
- * and FC headers are pulled into the linear data area.
- */
- if (unlikely((skb->len < FCOE_MIN_FRAME) ||
- !pskb_may_pull(skb, FCOE_HEADER_LEN)))
- goto err;
-
- skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
- fh = (struct fc_frame_header *) skb_transport_header(skb);
-
- oxid = ntohs(fh->fh_ox_id);
-
- fr = fcoe_dev_from_skb(skb);
- fr->fr_dev = lp;
- fr->ptype = ptype;
-
-#ifdef CONFIG_SMP
- /*
- * The incoming frame exchange id(oxid) is ANDed with num of online
- * cpu bits to get cpu and then this cpu is used for selecting
- * a per cpu kernel thread from fcoe_percpu.
- */
- cpu = oxid & (num_online_cpus() - 1);
-#endif
-
- fps = &per_cpu(fcoe_percpu, cpu);
- spin_lock_bh(&fps->fcoe_rx_list.lock);
- if (unlikely(!fps->thread)) {
- /*
- * The targeted CPU is not ready, let's target
- * the first CPU now. For non-SMP systems this
- * will check the same CPU twice.
- */
- FC_DBG("CPU is online, but no receive thread ready "
- "for incoming skb- using first online CPU.\n");
-
- spin_unlock_bh(&fps->fcoe_rx_list.lock);
- cpu = first_cpu(cpu_online_map);
- fps = &per_cpu(fcoe_percpu, cpu);
- spin_lock_bh(&fps->fcoe_rx_list.lock);
- if (!fps->thread) {
- spin_unlock_bh(&fps->fcoe_rx_list.lock);
- goto err;
- }
- }
-
- /*
- * We now have a valid CPU that we're targeting for
- * this skb. We also have this receive thread locked,
- * so we're free to queue skbs into it's queue.
- */
- __skb_queue_tail(&fps->fcoe_rx_list, skb);
- if (fps->fcoe_rx_list.qlen == 1)
- wake_up_process(fps->thread);
-
- spin_unlock_bh(&fps->fcoe_rx_list.lock);
-
- return 0;
-err:
- fc_lport_get_stats(lp)->ErrorFrames++;
-
-err2:
- kfree_skb(skb);
- return -1;
-}
-EXPORT_SYMBOL_GPL(fcoe_rcv);
-
-/**
- * fcoe_start_io() - pass to netdev to start xmit for fcoe
- * @skb: the skb to be xmitted
- *
- * Returns: 0 for success
- */
-static inline int fcoe_start_io(struct sk_buff *skb)
-{
- int rc;
-
- skb_get(skb);
- rc = dev_queue_xmit(skb);
- if (rc != 0)
- return rc;
- kfree_skb(skb);
- return 0;
-}
-
-/**
- * fcoe_get_paged_crc_eof() - in case we need alloc a page for crc_eof
- * @skb: the skb to be xmitted
- * @tlen: total len
- *
- * Returns: 0 for success
- */
-static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
-{
- struct fcoe_percpu_s *fps;
- struct page *page;
-
- fps = &get_cpu_var(fcoe_percpu);
- page = fps->crc_eof_page;
- if (!page) {
- page = alloc_page(GFP_ATOMIC);
- if (!page) {
- put_cpu_var(fcoe_percpu);
- return -ENOMEM;
- }
- fps->crc_eof_page = page;
- fps->crc_eof_offset = 0;
- }
-
- get_page(page);
- skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
- fps->crc_eof_offset, tlen);
- skb->len += tlen;
- skb->data_len += tlen;
- skb->truesize += tlen;
- fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
-
- if (fps->crc_eof_offset >= PAGE_SIZE) {
- fps->crc_eof_page = NULL;
- fps->crc_eof_offset = 0;
- put_page(page);
- }
- put_cpu_var(fcoe_percpu);
- return 0;
-}
-
-/**
- * fcoe_fc_crc() - calculates FC CRC in this fcoe skb
- * @fp: the fc_frame containg data to be checksummed
- *
- * This uses crc32() to calculate the crc for fc frame
- * Return : 32 bit crc
- */
-u32 fcoe_fc_crc(struct fc_frame *fp)
-{
- struct sk_buff *skb = fp_skb(fp);
- struct skb_frag_struct *frag;
- unsigned char *data;
- unsigned long off, len, clen;
- u32 crc;
- unsigned i;
-
- crc = crc32(~0, skb->data, skb_headlen(skb));
-
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- frag = &skb_shinfo(skb)->frags[i];
- off = frag->page_offset;
- len = frag->size;
- while (len > 0) {
- clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
- data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
- KM_SKB_DATA_SOFTIRQ);
- crc = crc32(crc, data + (off & ~PAGE_MASK), clen);
- kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
- off += clen;
- len -= clen;
- }
- }
- return crc;
-}
-EXPORT_SYMBOL_GPL(fcoe_fc_crc);
-
-/**
- * fcoe_xmit() - FCoE frame transmit function
- * @lp: the associated local port
- * @fp: the fc_frame to be transmitted
- *
- * Return : 0 for success
- */
-int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
-{
- int wlen, rc = 0;
- u32 crc;
- struct ethhdr *eh;
- struct fcoe_crc_eof *cp;
- struct sk_buff *skb;
- struct fcoe_dev_stats *stats;
- struct fc_frame_header *fh;
- unsigned int hlen; /* header length implies the version */
- unsigned int tlen; /* trailer length */
- unsigned int elen; /* eth header, may include vlan */
- int flogi_in_progress = 0;
- struct fcoe_softc *fc;
- u8 sof, eof;
- struct fcoe_hdr *hp;
-
- WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
-
- fc = lport_priv(lp);
- /*
- * if it is a flogi then we need to learn gw-addr
- * and my own fcid
- */
- fh = fc_frame_header_get(fp);
- if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
- if (fc_frame_payload_op(fp) == ELS_FLOGI) {
- fc->flogi_oxid = ntohs(fh->fh_ox_id);
- fc->address_mode = FCOE_FCOUI_ADDR_MODE;
- fc->flogi_progress = 1;
- flogi_in_progress = 1;
- } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) {
- /*
- * Here we must've gotten an SID by accepting an FLOGI
- * from a point-to-point connection. Switch to using
- * the source mac based on the SID. The destination
- * MAC in this case would have been set by receving the
- * FLOGI.
- */
- fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
- fc->flogi_progress = 0;
- }
- }
-
- skb = fp_skb(fp);
- sof = fr_sof(fp);
- eof = fr_eof(fp);
-
- elen = (fc->real_dev->priv_flags & IFF_802_1Q_VLAN) ?
- sizeof(struct vlan_ethhdr) : sizeof(struct ethhdr);
- hlen = sizeof(struct fcoe_hdr);
- tlen = sizeof(struct fcoe_crc_eof);
- wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
-
- /* crc offload */
- if (likely(lp->crc_offload)) {
- skb->ip_summed = CHECKSUM_PARTIAL;
- skb->csum_start = skb_headroom(skb);
- skb->csum_offset = skb->len;
- crc = 0;
- } else {
- skb->ip_summed = CHECKSUM_NONE;
- crc = fcoe_fc_crc(fp);
- }
-
- /* copy fc crc and eof to the skb buff */
- if (skb_is_nonlinear(skb)) {
- skb_frag_t *frag;
- if (fcoe_get_paged_crc_eof(skb, tlen)) {
- kfree_skb(skb);
- return -ENOMEM;
- }
- frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
- cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
- + frag->page_offset;
- } else {
- cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
- }
-
- memset(cp, 0, sizeof(*cp));
- cp->fcoe_eof = eof;
- cp->fcoe_crc32 = cpu_to_le32(~crc);
-
- if (skb_is_nonlinear(skb)) {
- kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
- cp = NULL;
- }
-
- /* adjust skb netowrk/transport offsets to match mac/fcoe/fc */
- skb_push(skb, elen + hlen);
- skb_reset_mac_header(skb);
- skb_reset_network_header(skb);
- skb->mac_len = elen;
- skb->protocol = htons(ETH_P_FCOE);
- skb->dev = fc->real_dev;
-
- /* fill up mac and fcoe headers */
- eh = eth_hdr(skb);
- eh->h_proto = htons(ETH_P_FCOE);
- if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
- fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
- else
- /* insert GW address */
- memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
-
- if (unlikely(flogi_in_progress))
- memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
- else
- memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);
-
- hp = (struct fcoe_hdr *)(eh + 1);
- memset(hp, 0, sizeof(*hp));
- if (FC_FCOE_VER)
- FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
- hp->fcoe_sof = sof;
-
-#ifdef NETIF_F_FSO
- /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
- if (lp->seq_offload && fr_max_payload(fp)) {
- skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
- skb_shinfo(skb)->gso_size = fr_max_payload(fp);
- } else {
- skb_shinfo(skb)->gso_type = 0;
- skb_shinfo(skb)->gso_size = 0;
- }
-#endif
- /* update tx stats: regardless if LLD fails */
- stats = fc_lport_get_stats(lp);
- stats->TxFrames++;
- stats->TxWords += wlen;
-
- /* send down to lld */
- fr_dev(fp) = lp;
- if (fc->fcoe_pending_queue.qlen)
- rc = fcoe_check_wait_queue(lp);
-
- if (rc == 0)
- rc = fcoe_start_io(skb);
-
- if (rc) {
- spin_lock_bh(&fc->fcoe_pending_queue.lock);
- __skb_queue_tail(&fc->fcoe_pending_queue, skb);
- spin_unlock_bh(&fc->fcoe_pending_queue.lock);
- if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
- lp->qfull = 1;
- }
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(fcoe_xmit);
-
-/**
- * fcoe_percpu_receive_thread() - recv thread per cpu
- * @arg: ptr to the fcoe per cpu struct
- *
- * Return: 0 for success
- */
-int fcoe_percpu_receive_thread(void *arg)
-{
- struct fcoe_percpu_s *p = arg;
- u32 fr_len;
- struct fc_lport *lp;
- struct fcoe_rcv_info *fr;
- struct fcoe_dev_stats *stats;
- struct fc_frame_header *fh;
- struct sk_buff *skb;
- struct fcoe_crc_eof crc_eof;
- struct fc_frame *fp;
- u8 *mac = NULL;
- struct fcoe_softc *fc;
- struct fcoe_hdr *hp;
-
- set_user_nice(current, -20);
-
- while (!kthread_should_stop()) {
-
- spin_lock_bh(&p->fcoe_rx_list.lock);
- while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
- set_current_state(TASK_INTERRUPTIBLE);
- spin_unlock_bh(&p->fcoe_rx_list.lock);
- schedule();
- set_current_state(TASK_RUNNING);
- if (kthread_should_stop())
- return 0;
- spin_lock_bh(&p->fcoe_rx_list.lock);
- }
- spin_unlock_bh(&p->fcoe_rx_list.lock);
- fr = fcoe_dev_from_skb(skb);
- lp = fr->fr_dev;
- if (unlikely(lp == NULL)) {
- FC_DBG("invalid HBA Structure");
- kfree_skb(skb);
- continue;
- }
-
- if (unlikely(debug_fcoe)) {
- FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
- "tail:%p end:%p sum:%d dev:%s",
- skb->len, skb->data_len,
- skb->head, skb->data, skb_tail_pointer(skb),
- skb_end_pointer(skb), skb->csum,
- skb->dev ? skb->dev->name : "<NULL>");
- }
-
- /*
- * Save source MAC address before discarding header.
- */
- fc = lport_priv(lp);
- if (unlikely(fc->flogi_progress))
- mac = eth_hdr(skb)->h_source;
-
- if (skb_is_nonlinear(skb))
- skb_linearize(skb); /* not ideal */
-
- /*
- * Frame length checks and setting up the header pointers
- * was done in fcoe_rcv already.
- */
- hp = (struct fcoe_hdr *) skb_network_header(skb);
- fh = (struct fc_frame_header *) skb_transport_header(skb);
-
- stats = fc_lport_get_stats(lp);
- if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
- if (stats->ErrorFrames < 5)
- printk(KERN_WARNING "FCoE version "
- "mismatch: The frame has "
- "version %x, but the "
- "initiator supports version "
- "%x\n", FC_FCOE_DECAPS_VER(hp),
- FC_FCOE_VER);
- stats->ErrorFrames++;
- kfree_skb(skb);
- continue;
- }
-
- skb_pull(skb, sizeof(struct fcoe_hdr));
- fr_len = skb->len - sizeof(struct fcoe_crc_eof);
-
- stats->RxFrames++;
- stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
-
- fp = (struct fc_frame *)skb;
- fc_frame_init(fp);
- fr_dev(fp) = lp;
- fr_sof(fp) = hp->fcoe_sof;
-
- /* Copy out the CRC and EOF trailer for access */
- if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) {
- kfree_skb(skb);
- continue;
- }
- fr_eof(fp) = crc_eof.fcoe_eof;
- fr_crc(fp) = crc_eof.fcoe_crc32;
- if (pskb_trim(skb, fr_len)) {
- kfree_skb(skb);
- continue;
- }
-
- /*
- * We only check CRC if no offload is available and if it is
- * it's solicited data, in which case, the FCP layer would
- * check it during the copy.
- */
- if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
- fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
- else
- fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
-
- fh = fc_frame_header_get(fp);
- if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
- fh->fh_type == FC_TYPE_FCP) {
- fc_exch_recv(lp, lp->emp, fp);
- continue;
- }
- if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
- if (le32_to_cpu(fr_crc(fp)) !=
- ~crc32(~0, skb->data, fr_len)) {
- if (debug_fcoe || stats->InvalidCRCCount < 5)
- printk(KERN_WARNING "fcoe: dropping "
- "frame with CRC error\n");
- stats->InvalidCRCCount++;
- stats->ErrorFrames++;
- fc_frame_free(fp);
- continue;
- }
- fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
- }
- /* non flogi and non data exchanges are handled here */
- if (unlikely(fc->flogi_progress))
- fcoe_recv_flogi(fc, fp, mac);
- fc_exch_recv(lp, lp->emp, fp);
- }
- return 0;
-}
-
-/**
- * fcoe_recv_flogi() - flogi receive function
- * @fc: associated fcoe_softc
- * @fp: the recieved frame
- * @sa: the source address of this flogi
- *
- * This is responsible to parse the flogi response and sets the corresponding
- * mac address for the initiator, eitehr OUI based or GW based.
- *
- * Returns: none
- */
-static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
-{
- struct fc_frame_header *fh;
- u8 op;
-
- fh = fc_frame_header_get(fp);
- if (fh->fh_type != FC_TYPE_ELS)
- return;
- op = fc_frame_payload_op(fp);
- if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
- fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
- /*
- * FLOGI accepted.
- * If the src mac addr is FC_OUI-based, then we mark the
- * address_mode flag to use FC_OUI-based Ethernet DA.
- * Otherwise we use the FCoE gateway addr
- */
- if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) {
- fc->address_mode = FCOE_FCOUI_ADDR_MODE;
- } else {
- memcpy(fc->dest_addr, sa, ETH_ALEN);
- fc->address_mode = FCOE_GW_ADDR_MODE;
- }
-
- /*
- * Remove any previously-set unicast MAC filter.
- * Add secondary FCoE MAC address filter for our OUI.
- */
- rtnl_lock();
- if (compare_ether_addr(fc->data_src_addr, (u8[6]) { 0 }))
- dev_unicast_delete(fc->real_dev, fc->data_src_addr,
- ETH_ALEN);
- fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
- dev_unicast_add(fc->real_dev, fc->data_src_addr, ETH_ALEN);
- rtnl_unlock();
-
- fc->flogi_progress = 0;
- } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
- /*
- * Save source MAC for point-to-point responses.
- */
- memcpy(fc->dest_addr, sa, ETH_ALEN);
- fc->address_mode = FCOE_GW_ADDR_MODE;
- }
-}
-
-/**
- * fcoe_watchdog() - fcoe timer callback
- * @vp:
- *
- * This checks the pending queue length for fcoe and set lport qfull
- * if the FCOE_MAX_QUEUE_DEPTH is reached. This is done for all fc_lport on the
- * fcoe_hostlist.
- *
- * Returns: 0 for success
- */
-void fcoe_watchdog(ulong vp)
-{
- struct fcoe_softc *fc;
-
- read_lock(&fcoe_hostlist_lock);
- list_for_each_entry(fc, &fcoe_hostlist, list) {
- if (fc->lp)
- fcoe_check_wait_queue(fc->lp);
- }
- read_unlock(&fcoe_hostlist_lock);
-
- fcoe_timer.expires = jiffies + (1 * HZ);
- add_timer(&fcoe_timer);
-}
-
-
-/**
- * fcoe_check_wait_queue() - put the skb into fcoe pending xmit queue
- * @lp: the fc_port for this skb
- * @skb: the associated skb to be xmitted
- *
- * This empties the wait_queue, dequeue the head of the wait_queue queue
- * and calls fcoe_start_io() for each packet, if all skb have been
- * transmitted, return qlen or -1 if a error occurs, then restore
- * wait_queue and try again later.
- *
- * The wait_queue is used when the skb transmit fails. skb will go
- * in the wait_queue which will be emptied by the time function OR
- * by the next skb transmit.
- *
- * Returns: 0 for success
- */
-static int fcoe_check_wait_queue(struct fc_lport *lp)
-{
- struct fcoe_softc *fc = lport_priv(lp);
- struct sk_buff *skb;
- int rc = -1;
-
- spin_lock_bh(&fc->fcoe_pending_queue.lock);
- if (fc->fcoe_pending_queue_active)
- goto out;
- fc->fcoe_pending_queue_active = 1;
-
- while (fc->fcoe_pending_queue.qlen) {
- /* keep qlen > 0 until fcoe_start_io succeeds */
- fc->fcoe_pending_queue.qlen++;
- skb = __skb_dequeue(&fc->fcoe_pending_queue);
-
- spin_unlock_bh(&fc->fcoe_pending_queue.lock);
- rc = fcoe_start_io(skb);
- spin_lock_bh(&fc->fcoe_pending_queue.lock);
-
- if (rc) {
- __skb_queue_head(&fc->fcoe_pending_queue, skb);
- /* undo temporary increment above */
- fc->fcoe_pending_queue.qlen--;
- break;
- }
- /* undo temporary increment above */
- fc->fcoe_pending_queue.qlen--;
- }
-
- if (fc->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH)
- lp->qfull = 0;
- fc->fcoe_pending_queue_active = 0;
- rc = fc->fcoe_pending_queue.qlen;
-out:
- spin_unlock_bh(&fc->fcoe_pending_queue.lock);
- return rc;
-}
-
-/**
- * fcoe_dev_setup() - setup link change notification interface
- */
-static void fcoe_dev_setup()
-{
- /*
- * here setup a interface specific wd time to
- * monitor the link state
- */
- register_netdevice_notifier(&fcoe_notifier);
-}
-
-/**
- * fcoe_dev_setup() - cleanup link change notification interface
- */
-static void fcoe_dev_cleanup(void)
-{
- unregister_netdevice_notifier(&fcoe_notifier);
-}
-
-/**
- * fcoe_device_notification() - netdev event notification callback
- * @notifier: context of the notification
- * @event: type of event
- * @ptr: fixed array for output parsed ifname
- *
- * This function is called by the ethernet driver in case of link change event
- *
- * Returns: 0 for success
- */
-static int fcoe_device_notification(struct notifier_block *notifier,
- ulong event, void *ptr)
-{
- struct fc_lport *lp = NULL;
- struct net_device *real_dev = ptr;
- struct fcoe_softc *fc;
- struct fcoe_dev_stats *stats;
- u32 new_link_up;
- u32 mfs;
- int rc = NOTIFY_OK;
-
- read_lock(&fcoe_hostlist_lock);
- list_for_each_entry(fc, &fcoe_hostlist, list) {
- if (fc->real_dev == real_dev) {
- lp = fc->lp;
- break;
- }
- }
- read_unlock(&fcoe_hostlist_lock);
- if (lp == NULL) {
- rc = NOTIFY_DONE;
- goto out;
- }
-
- new_link_up = lp->link_up;
- switch (event) {
- case NETDEV_DOWN:
- case NETDEV_GOING_DOWN:
- new_link_up = 0;
- break;
- case NETDEV_UP:
- case NETDEV_CHANGE:
- new_link_up = !fcoe_link_ok(lp);
- break;
- case NETDEV_CHANGEMTU:
- mfs = fc->real_dev->mtu -
- (sizeof(struct fcoe_hdr) +
- sizeof(struct fcoe_crc_eof));
- if (mfs >= FC_MIN_MAX_FRAME)
- fc_set_mfs(lp, mfs);
- new_link_up = !fcoe_link_ok(lp);
- break;
- case NETDEV_REGISTER:
- break;
- default:
- FC_DBG("unknown event %ld call", event);
- }
- if (lp->link_up != new_link_up) {
- if (new_link_up)
- fc_linkup(lp);
- else {
- stats = fc_lport_get_stats(lp);
- stats->LinkFailureCount++;
- fc_linkdown(lp);
- fcoe_clean_pending_queue(lp);
- }
- }
-out:
- return rc;
-}
-
-/**
- * fcoe_if_to_netdev() - parse a name buffer to get netdev
- * @ifname: fixed array for output parsed ifname
- * @buffer: incoming buffer to be copied
- *
- * Returns: NULL or ptr to netdeive
- */
-static struct net_device *fcoe_if_to_netdev(const char *buffer)
-{
- char *cp;
- char ifname[IFNAMSIZ + 2];
-
- if (buffer) {
- strlcpy(ifname, buffer, IFNAMSIZ);
- cp = ifname + strlen(ifname);
- while (--cp >= ifname && *cp == '\n')
- *cp = '\0';
- return dev_get_by_name(&init_net, ifname);
- }
- return NULL;
-}
-
-/**
- * fcoe_netdev_to_module_owner() - finds out the nic drive moddule of the netdev
- * @netdev: the target netdev
- *
- * Returns: ptr to the struct module, NULL for failure
- */
-static struct module *
-fcoe_netdev_to_module_owner(const struct net_device *netdev)
-{
- struct device *dev;
-
- if (!netdev)
- return NULL;
-
- dev = netdev->dev.parent;
- if (!dev)
- return NULL;
-
- if (!dev->driver)
- return NULL;
-
- return dev->driver->owner;
-}
-
-/**
- * fcoe_ethdrv_get() - Hold the Ethernet driver
- * @netdev: the target netdev
- *
- * Holds the Ethernet driver module by try_module_get() for
- * the corresponding netdev.
- *
- * Returns: 0 for succsss
- */
-static int fcoe_ethdrv_get(const struct net_device *netdev)
-{
- struct module *owner;
-
- owner = fcoe_netdev_to_module_owner(netdev);
- if (owner) {
- printk(KERN_DEBUG "fcoe:hold driver module %s for %s\n",
- module_name(owner), netdev->name);
- return try_module_get(owner);
- }
- return -ENODEV;
-}
-
-/**
- * fcoe_ethdrv_put() - Release the Ethernet driver
- * @netdev: the target netdev
- *
- * Releases the Ethernet driver module by module_put for
- * the corresponding netdev.
- *
- * Returns: 0 for succsss
- */
-static int fcoe_ethdrv_put(const struct net_device *netdev)
-{
- struct module *owner;
-
- owner = fcoe_netdev_to_module_owner(netdev);
- if (owner) {
- printk(KERN_DEBUG "fcoe:release driver module %s for %s\n",
- module_name(owner), netdev->name);
- module_put(owner);
- return 0;
- }
- return -ENODEV;
-}
-
-/**
- * fcoe_destroy() - handles the destroy from sysfs
- * @buffer: expcted to be a eth if name
- * @kp: associated kernel param
- *
- * Returns: 0 for success
- */
-static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
-{
- int rc;
- struct net_device *netdev;
-
- netdev = fcoe_if_to_netdev(buffer);
- if (!netdev) {
- rc = -ENODEV;
- goto out_nodev;
- }
- /* look for existing lport */
- if (!fcoe_hostlist_lookup(netdev)) {
- rc = -ENODEV;
- goto out_putdev;
- }
- rc = fcoe_if_destroy(netdev);
- if (rc) {
- printk(KERN_ERR "fcoe: fcoe_if_destroy(%s) failed\n",
- netdev->name);
- rc = -EIO;
- goto out_putdev;
- }
- fcoe_ethdrv_put(netdev);
- rc = 0;
-out_putdev:
- dev_put(netdev);
-out_nodev:
- return rc;
-}
-
-/**
- * fcoe_create() - Handles the create call from sysfs
- * @buffer: expcted to be a eth if name
- * @kp: associated kernel param
- *
- * Returns: 0 for success
- */
-static int fcoe_create(const char *buffer, struct kernel_param *kp)
-{
- int rc;
- struct net_device *netdev;
-
- netdev = fcoe_if_to_netdev(buffer);
- if (!netdev) {
- rc = -ENODEV;
- goto out_nodev;
- }
- /* look for existing lport */
- if (fcoe_hostlist_lookup(netdev)) {
- rc = -EEXIST;
- goto out_putdev;
- }
- fcoe_ethdrv_get(netdev);
-
- rc = fcoe_if_create(netdev);
- if (rc) {
- printk(KERN_ERR "fcoe: fcoe_if_create(%s) failed\n",
- netdev->name);
- fcoe_ethdrv_put(netdev);
- rc = -EIO;
- goto out_putdev;
- }
- rc = 0;
-out_putdev:
- dev_put(netdev);
-out_nodev:
- return rc;
-}
-
-module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
-__MODULE_PARM_TYPE(create, "string");
-MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
-module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
-__MODULE_PARM_TYPE(destroy, "string");
-MODULE_PARM_DESC(destroy, "Destroy fcoe port");
-
-/**
- * fcoe_link_ok() - Check if link is ok for the fc_lport
- * @lp: ptr to the fc_lport
- *
- * Any permanently-disqualifying conditions have been previously checked.
- * This also updates the speed setting, which may change with link for 100/1000.
- *
- * This function should probably be checking for PAUSE support at some point
- * in the future. Currently Per-priority-pause is not determinable using
- * ethtool, so we shouldn't be restrictive until that problem is resolved.
- *
- * Returns: 0 if link is OK for use by FCoE.
- *
- */
-int fcoe_link_ok(struct fc_lport *lp)
-{
- struct fcoe_softc *fc = lport_priv(lp);
- struct net_device *dev = fc->real_dev;
- struct ethtool_cmd ecmd = { ETHTOOL_GSET };
- int rc = 0;
-
- if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
- dev = fc->phys_dev;
- if (dev->ethtool_ops->get_settings) {
- dev->ethtool_ops->get_settings(dev, &ecmd);
- lp->link_supported_speeds &=
- ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
- if (ecmd.supported & (SUPPORTED_1000baseT_Half |
- SUPPORTED_1000baseT_Full))
- lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
- if (ecmd.supported & SUPPORTED_10000baseT_Full)
- lp->link_supported_speeds |=
- FC_PORTSPEED_10GBIT;
- if (ecmd.speed == SPEED_1000)
- lp->link_speed = FC_PORTSPEED_1GBIT;
- if (ecmd.speed == SPEED_10000)
- lp->link_speed = FC_PORTSPEED_10GBIT;
- }
- } else
- rc = -1;
-
- return rc;
-}
-EXPORT_SYMBOL_GPL(fcoe_link_ok);
-
-/**
- * fcoe_percpu_clean() - Clear the pending skbs for an lport
- * @lp: the fc_lport
- */
-void fcoe_percpu_clean(struct fc_lport *lp)
-{
- struct fcoe_percpu_s *pp;
- struct fcoe_rcv_info *fr;
- struct sk_buff_head *list;
- struct sk_buff *skb, *next;
- struct sk_buff *head;
- unsigned int cpu;
-
- for_each_possible_cpu(cpu) {
- pp = &per_cpu(fcoe_percpu, cpu);
- spin_lock_bh(&pp->fcoe_rx_list.lock);
- list = &pp->fcoe_rx_list;
- head = list->next;
- for (skb = head; skb != (struct sk_buff *)list;
- skb = next) {
- next = skb->next;
- fr = fcoe_dev_from_skb(skb);
- if (fr->fr_dev == lp) {
- __skb_unlink(skb, list);
- kfree_skb(skb);
- }
- }
- spin_unlock_bh(&pp->fcoe_rx_list.lock);
- }
-}
-EXPORT_SYMBOL_GPL(fcoe_percpu_clean);
-
-/**
- * fcoe_clean_pending_queue() - Dequeue a skb and free it
- * @lp: the corresponding fc_lport
- *
- * Returns: none
- */
-void fcoe_clean_pending_queue(struct fc_lport *lp)
-{
- struct fcoe_softc *fc = lport_priv(lp);
- struct sk_buff *skb;
-
- spin_lock_bh(&fc->fcoe_pending_queue.lock);
- while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
- spin_unlock_bh(&fc->fcoe_pending_queue.lock);
- kfree_skb(skb);
- spin_lock_bh(&fc->fcoe_pending_queue.lock);
- }
- spin_unlock_bh(&fc->fcoe_pending_queue.lock);
-}
-EXPORT_SYMBOL_GPL(fcoe_clean_pending_queue);
-
-/**
- * libfc_host_alloc() - Allocate a Scsi_Host with room for the fc_lport
- * @sht: ptr to the scsi host templ
- * @priv_size: size of private data after fc_lport
- *
- * Returns: ptr to Scsi_Host
- * TODO: to libfc?
- */
-static inline struct Scsi_Host *
-libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
-{
- return scsi_host_alloc(sht, sizeof(struct fc_lport) + priv_size);
-}
-
-/**
- * fcoe_host_alloc() - Allocate a Scsi_Host with room for the fcoe_softc
- * @sht: ptr to the scsi host templ
- * @priv_size: size of private data after fc_lport
- *
- * Returns: ptr to Scsi_Host
- */
-struct Scsi_Host *fcoe_host_alloc(struct scsi_host_template *sht, int priv_size)
-{
- return libfc_host_alloc(sht, sizeof(struct fcoe_softc) + priv_size);
-}
-EXPORT_SYMBOL_GPL(fcoe_host_alloc);
-
-/**
- * fcoe_reset() - Resets the fcoe
- * @shost: shost the reset is from
- *
- * Returns: always 0
- */
-int fcoe_reset(struct Scsi_Host *shost)
-{
- struct fc_lport *lport = shost_priv(shost);
- fc_lport_reset(lport);
- return 0;
-}
-EXPORT_SYMBOL_GPL(fcoe_reset);
-
-/**
- * fcoe_wwn_from_mac() - Converts 48-bit IEEE MAC address to 64-bit FC WWN.
- * @mac: mac address
- * @scheme: check port
- * @port: port indicator for converting
- *
- * Returns: u64 fc world wide name
- */
-u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
- unsigned int scheme, unsigned int port)
-{
- u64 wwn;
- u64 host_mac;
-
- /* The MAC is in NO, so flip only the low 48 bits */
- host_mac = ((u64) mac[0] << 40) |
- ((u64) mac[1] << 32) |
- ((u64) mac[2] << 24) |
- ((u64) mac[3] << 16) |
- ((u64) mac[4] << 8) |
- (u64) mac[5];
-
- WARN_ON(host_mac >= (1ULL << 48));
- wwn = host_mac | ((u64) scheme << 60);
- switch (scheme) {
- case 1:
- WARN_ON(port != 0);
- break;
- case 2:
- WARN_ON(port >= 0xfff);
- wwn |= (u64) port << 48;
- break;
- default:
- WARN_ON(1);
- break;
- }
-
- return wwn;
-}
-EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
-
-/**
- * fcoe_hostlist_lookup_softc() - find the corresponding lport by a given device
- * @device: this is currently ptr to net_device
- *
- * Returns: NULL or the located fcoe_softc
- */
-static struct fcoe_softc *
-fcoe_hostlist_lookup_softc(const struct net_device *dev)
-{
- struct fcoe_softc *fc;
-
- read_lock(&fcoe_hostlist_lock);
- list_for_each_entry(fc, &fcoe_hostlist, list) {
- if (fc->real_dev == dev) {
- read_unlock(&fcoe_hostlist_lock);
- return fc;
- }
- }
- read_unlock(&fcoe_hostlist_lock);
- return NULL;
-}
-
-/**
- * fcoe_hostlist_lookup() - Find the corresponding lport by netdev
- * @netdev: ptr to net_device
- *
- * Returns: 0 for success
- */
-struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
-{
- struct fcoe_softc *fc;
-
- fc = fcoe_hostlist_lookup_softc(netdev);
-
- return (fc) ? fc->lp : NULL;
-}
-EXPORT_SYMBOL_GPL(fcoe_hostlist_lookup);
-
-/**
- * fcoe_hostlist_add() - Add a lport to lports list
- * @lp: ptr to the fc_lport to badded
- *
- * Returns: 0 for success
- */
-int fcoe_hostlist_add(const struct fc_lport *lp)
-{
- struct fcoe_softc *fc;
-
- fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
- if (!fc) {
- fc = lport_priv(lp);
- write_lock_bh(&fcoe_hostlist_lock);
- list_add_tail(&fc->list, &fcoe_hostlist);
- write_unlock_bh(&fcoe_hostlist_lock);
- }
- return 0;
-}
-EXPORT_SYMBOL_GPL(fcoe_hostlist_add);
-
-/**
- * fcoe_hostlist_remove() - remove a lport from lports list
- * @lp: ptr to the fc_lport to badded
- *
- * Returns: 0 for success
- */
-int fcoe_hostlist_remove(const struct fc_lport *lp)
-{
- struct fcoe_softc *fc;
-
- fc = fcoe_hostlist_lookup_softc(fcoe_netdev(lp));
- BUG_ON(!fc);
- write_lock_bh(&fcoe_hostlist_lock);
- list_del(&fc->list);
- write_unlock_bh(&fcoe_hostlist_lock);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(fcoe_hostlist_remove);
-
-/**
- * fcoe_libfc_config() - sets up libfc related properties for lport
- * @lp: ptr to the fc_lport
- * @tt: libfc function template
- *
- * Returns : 0 for success
- */
-int fcoe_libfc_config(struct fc_lport *lp, struct libfc_function_template *tt)
-{
- /* Set the function pointers set by the LLDD */
- memcpy(&lp->tt, tt, sizeof(*tt));
- if (fc_fcp_init(lp))
- return -ENOMEM;
- fc_exch_init(lp);
- fc_elsct_init(lp);
- fc_lport_init(lp);
- fc_rport_init(lp);
- fc_disc_init(lp);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(fcoe_libfc_config);
-
-/**
- * fcoe_init() - fcoe module loading initialization
- *
- * Returns 0 on success, negative on failure
- */
-static int __init fcoe_init(void)
-{
- unsigned int cpu;
- int rc = 0;
- struct fcoe_percpu_s *p;
-
- INIT_LIST_HEAD(&fcoe_hostlist);
- rwlock_init(&fcoe_hostlist_lock);
-
- for_each_possible_cpu(cpu) {
- p = &per_cpu(fcoe_percpu, cpu);
- skb_queue_head_init(&p->fcoe_rx_list);
- }
-
- for_each_online_cpu(cpu)
- fcoe_percpu_thread_create(cpu);
-
- /* Initialize per CPU interrupt thread */
- rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
- if (rc)
- goto out_free;
-
- /* Setup link change notification */
- fcoe_dev_setup();
-
- setup_timer(&fcoe_timer, fcoe_watchdog, 0);
-
- mod_timer(&fcoe_timer, jiffies + (10 * HZ));
-
- fcoe_if_init();
-
- return 0;
-
-out_free:
- for_each_online_cpu(cpu) {
- fcoe_percpu_thread_destroy(cpu);
- }
-
- return rc;
-}
-module_init(fcoe_init);
-
-/**
- * fcoe_exit() - fcoe module unloading cleanup
- *
- * Returns 0 on success, negative on failure
- */
-static void __exit fcoe_exit(void)
-{
- unsigned int cpu;
- struct fcoe_softc *fc, *tmp;
-
- fcoe_dev_cleanup();
-
- /* Stop the timer */
- del_timer_sync(&fcoe_timer);
-
- /* releases the associated fcoe hosts */
- list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
- fcoe_if_destroy(fc->real_dev);
-
- unregister_hotcpu_notifier(&fcoe_cpu_notifier);
-
- for_each_online_cpu(cpu) {
- fcoe_percpu_thread_destroy(cpu);
- }
-
- /* detach from scsi transport */
- fcoe_if_exit();
-}
-module_exit(fcoe_exit);
projects / firefly-linux-kernel-4.4.55.git / commitdiff