drivers/net/wireless/ath/wil6210/txrx.c

   1 /*
   2  * Copyright (c) 2012 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/hardirq.h>
  21 #include <net/ieee80211_radiotap.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/moduleparam.h>
  24
  25 #include "wil6210.h"
  26 #include "wmi.h"
  27 #include "txrx.h"
  28
  29 static bool rtap_include_phy_info;
  30 module_param(rtap_include_phy_info, bool, S_IRUGO);
  31 MODULE_PARM_DESC(rtap_include_phy_info,
  32                  " Include PHY info in the radiotap header, default - no");
  33
  34 static inline int wil_vring_is_empty(struct vring *vring)
  35 {
  36         return vring->swhead == vring->swtail;
  37 }
  38
  39 static inline u32 wil_vring_next_tail(struct vring *vring)
  40 {
  41         return (vring->swtail + 1) % vring->size;
  42 }
  43
  44 static inline void wil_vring_advance_head(struct vring *vring, int n)
  45 {
  46         vring->swhead = (vring->swhead + n) % vring->size;
  47 }
  48
  49 static inline int wil_vring_is_full(struct vring *vring)
  50 {
  51         return wil_vring_next_tail(vring) == vring->swhead;
  52 }
  53 /*
  54  * Available space in Tx Vring
  55  */
  56 static inline int wil_vring_avail_tx(struct vring *vring)
  57 {
  58         u32 swhead = vring->swhead;
  59         u32 swtail = vring->swtail;
  60         int used = (vring->size + swhead - swtail) % vring->size;
  61
  62         return vring->size - used - 1;
  63 }
  64
  65 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
  66 {
  67         struct device *dev = wil_to_dev(wil);
  68         size_t sz = vring->size * sizeof(vring->va[0]);
  69         uint i;
  70
  71         BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
  72
  73         vring->swhead = 0;
  74         vring->swtail = 0;
  75         vring->ctx = kzalloc(vring->size * sizeof(vring->ctx[0]), GFP_KERNEL);
  76         if (!vring->ctx) {
  77                 wil_err(wil, "vring_alloc [%d] failed to alloc ctx mem\n",
  78                         vring->size);
  79                 vring->va = NULL;
  80                 return -ENOMEM;
  81         }
  82         /*
  83          * vring->va should be aligned on its size rounded up to power of 2
  84          * This is granted by the dma_alloc_coherent
  85          */
  86         vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
  87         if (!vring->va) {
  88                 wil_err(wil, "vring_alloc [%d] failed to alloc DMA mem\n",
  89                         vring->size);
  90                 kfree(vring->ctx);
  91                 vring->ctx = NULL;
  92                 return -ENOMEM;
  93         }
  94         /* initially, all descriptors are SW owned
  95          * For Tx and Rx, ownership bit is at the same location, thus
  96          * we can use any
  97          */
  98         for (i = 0; i < vring->size; i++) {
  99                 volatile struct vring_tx_desc *d = &(vring->va[i].tx);
 100                 d->dma.status = TX_DMA_STATUS_DU;
 101         }
 102
 103         wil_dbg(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
 104                 vring->va, (unsigned long long)vring->pa, vring->ctx);
 105
 106         return 0;
 107 }
 108
 109 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
 110                            int tx)
 111 {
 112         struct device *dev = wil_to_dev(wil);
 113         size_t sz = vring->size * sizeof(vring->va[0]);
 114
 115         while (!wil_vring_is_empty(vring)) {
 116                 if (tx) {
 117                         volatile struct vring_tx_desc *d =
 118                                         &vring->va[vring->swtail].tx;
 119                         dma_addr_t pa = d->dma.addr_low |
 120                                         ((u64)d->dma.addr_high << 32);
 121                         struct sk_buff *skb = vring->ctx[vring->swtail];
 122                         if (skb) {
 123                                 dma_unmap_single(dev, pa, d->dma.length,
 124                                                  DMA_TO_DEVICE);
 125                                 dev_kfree_skb_any(skb);
 126                                 vring->ctx[vring->swtail] = NULL;
 127                         } else {
 128                                 dma_unmap_page(dev, pa, d->dma.length,
 129                                                DMA_TO_DEVICE);
 130                         }
 131                         vring->swtail = wil_vring_next_tail(vring);
 132                 } else { /* rx */
 133                         volatile struct vring_rx_desc *d =
 134                                         &vring->va[vring->swtail].rx;
 135                         dma_addr_t pa = d->dma.addr_low |
 136                                         ((u64)d->dma.addr_high << 32);
 137                         struct sk_buff *skb = vring->ctx[vring->swhead];
 138                         dma_unmap_single(dev, pa, d->dma.length,
 139                                          DMA_FROM_DEVICE);
 140                         kfree_skb(skb);
 141                         wil_vring_advance_head(vring, 1);
 142                 }
 143         }
 144         dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
 145         kfree(vring->ctx);
 146         vring->pa = 0;
 147         vring->va = NULL;
 148         vring->ctx = NULL;
 149 }
 150
 151 /**
 152  * Allocate one skb for Rx VRING
 153  *
 154  * Safe to call from IRQ
 155  */
 156 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
 157                                u32 i, int headroom)
 158 {
 159         struct device *dev = wil_to_dev(wil);
 160         unsigned int sz = RX_BUF_LEN;
 161         volatile struct vring_rx_desc *d = &(vring->va[i].rx);
 162         dma_addr_t pa;
 163
 164         /* TODO align */
 165         struct sk_buff *skb = dev_alloc_skb(sz + headroom);
 166         if (unlikely(!skb))
 167                 return -ENOMEM;
 168
 169         skb_reserve(skb, headroom);
 170         skb_put(skb, sz);
 171
 172         pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
 173         if (unlikely(dma_mapping_error(dev, pa))) {
 174                 kfree_skb(skb);
 175                 return -ENOMEM;
 176         }
 177
 178         d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
 179         d->dma.addr_low = lower_32_bits(pa);
 180         d->dma.addr_high = (u16)upper_32_bits(pa);
 181         /* ip_length don't care */
 182         /* b11 don't care */
 183         /* error don't care */
 184         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
 185         d->dma.length = sz;
 186         vring->ctx[i] = skb;
 187
 188         return 0;
 189 }
 190
 191 /**
 192  * Adds radiotap header
 193  *
 194  * Any error indicated as "Bad FCS"
 195  *
 196  * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
 197  *  - Rx descriptor: 32 bytes
 198  *  - Phy info
 199  */
 200 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
 201                                        struct sk_buff *skb,
 202                                        volatile struct vring_rx_desc *d)
 203 {
 204         struct wireless_dev *wdev = wil->wdev;
 205         struct wil6210_rtap {
 206                 struct ieee80211_radiotap_header rthdr;
 207                 /* fields should be in the order of bits in rthdr.it_present */
 208                 /* flags */
 209                 u8 flags;
 210                 /* channel */
 211                 __le16 chnl_freq __aligned(2);
 212                 __le16 chnl_flags;
 213                 /* MCS */
 214                 u8 mcs_present;
 215                 u8 mcs_flags;
 216                 u8 mcs_index;
 217         } __packed;
 218         struct wil6210_rtap_vendor {
 219                 struct wil6210_rtap rtap;
 220                 /* vendor */
 221                 u8 vendor_oui[3] __aligned(2);
 222                 u8 vendor_ns;
 223                 __le16 vendor_skip;
 224                 u8 vendor_data[0];
 225         } __packed;
 226         struct wil6210_rtap_vendor *rtap_vendor;
 227         int rtap_len = sizeof(struct wil6210_rtap);
 228         int phy_length = 0; /* phy info header size, bytes */
 229         static char phy_data[128];
 230         struct ieee80211_channel *ch = wdev->preset_chandef.chan;
 231
 232         if (rtap_include_phy_info) {
 233                 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
 234                 /* calculate additional length */
 235                 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
 236                         /**
 237                          * PHY info starts from 8-byte boundary
 238                          * there are 8-byte lines, last line may be partially
 239                          * written (HW bug), thus FW configures for last line
 240                          * to be excessive. Driver skips this last line.
 241                          */
 242                         int len = min_t(int, 8 + sizeof(phy_data),
 243                                         wil_rxdesc_phy_length(d));
 244                         if (len > 8) {
 245                                 void *p = skb_tail_pointer(skb);
 246                                 void *pa = PTR_ALIGN(p, 8);
 247                                 if (skb_tailroom(skb) >= len + (pa - p)) {
 248                                         phy_length = len - 8;
 249                                         memcpy(phy_data, pa, phy_length);
 250                                 }
 251                         }
 252                 }
 253                 rtap_len += phy_length;
 254         }
 255
 256         if (skb_headroom(skb) < rtap_len &&
 257             pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
 258                 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
 259                 return;
 260         }
 261
 262         rtap_vendor = (void *)skb_push(skb, rtap_len);
 263         memset(rtap_vendor, 0, rtap_len);
 264
 265         rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
 266         rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
 267         rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
 268                         (1 << IEEE80211_RADIOTAP_FLAGS) |
 269                         (1 << IEEE80211_RADIOTAP_CHANNEL) |
 270                         (1 << IEEE80211_RADIOTAP_MCS));
 271         if (d->dma.status & RX_DMA_STATUS_ERROR)
 272                 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
 273
 274         rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
 275         rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
 276
 277         rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
 278         rtap_vendor->rtap.mcs_flags = 0;
 279         rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
 280
 281         if (rtap_include_phy_info) {
 282                 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
 283                                 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
 284                 /* OUI for Wilocity 04:ce:14 */
 285                 rtap_vendor->vendor_oui[0] = 0x04;
 286                 rtap_vendor->vendor_oui[1] = 0xce;
 287                 rtap_vendor->vendor_oui[2] = 0x14;
 288                 rtap_vendor->vendor_ns = 1;
 289                 /* Rx descriptor + PHY data  */
 290                 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
 291                                                        phy_length);
 292                 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
 293                 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
 294                        phy_length);
 295         }
 296 }
 297
 298 /*
 299  * Fast swap in place between 2 registers
 300  */
 301 static void wil_swap_u16(u16 *a, u16 *b)
 302 {
 303         *a ^= *b;
 304         *b ^= *a;
 305         *a ^= *b;
 306 }
 307
 308 static void wil_swap_ethaddr(void *data)
 309 {
 310         struct ethhdr *eth = data;
 311         u16 *s = (u16 *)eth->h_source;
 312         u16 *d = (u16 *)eth->h_dest;
 313
 314         wil_swap_u16(s++, d++);
 315         wil_swap_u16(s++, d++);
 316         wil_swap_u16(s, d);
 317 }
 318
 319 /**
 320  * reap 1 frame from @swhead
 321  *
 322  * Safe to call from IRQ
 323  */
 324 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
 325                                          struct vring *vring)
 326 {
 327         struct device *dev = wil_to_dev(wil);
 328         struct net_device *ndev = wil_to_ndev(wil);
 329         volatile struct vring_rx_desc *d;
 330         struct sk_buff *skb;
 331         dma_addr_t pa;
 332         unsigned int sz = RX_BUF_LEN;
 333         u8 ftype;
 334         u8 ds_bits;
 335
 336         if (wil_vring_is_empty(vring))
 337                 return NULL;
 338
 339         d = &(vring->va[vring->swhead].rx);
 340         if (!(d->dma.status & RX_DMA_STATUS_DU)) {
 341                 /* it is not error, we just reached end of Rx done area */
 342                 return NULL;
 343         }
 344
 345         pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
 346         skb = vring->ctx[vring->swhead];
 347         dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
 348         skb_trim(skb, d->dma.length);
 349
 350         wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
 351
 352         /* use radiotap header only if required */
 353         if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
 354                 wil_rx_add_radiotap_header(wil, skb, d);
 355
 356         wil_dbg_TXRX(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length);
 357         wil_hex_dump_TXRX("Rx ", DUMP_PREFIX_NONE, 32, 4,
 358                           (const void *)d, sizeof(*d), false);
 359
 360         wil_vring_advance_head(vring, 1);
 361
 362         /* no extra checks if in sniffer mode */
 363         if (ndev->type != ARPHRD_ETHER)
 364                 return skb;
 365         /*
 366          * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
 367          * Driver should recognize it by frame type, that is found
 368          * in Rx descriptor. If type is not data, it is 802.11 frame as is
 369          */
 370         ftype = wil_rxdesc_ftype(d) << 2;
 371         if (ftype != IEEE80211_FTYPE_DATA) {
 372                 wil_dbg_TXRX(wil, "Non-data frame ftype 0x%08x\n", ftype);
 373                 /* TODO: process it */
 374                 kfree_skb(skb);
 375                 return NULL;
 376         }
 377
 378         if (skb->len < ETH_HLEN) {
 379                 wil_err(wil, "Short frame, len = %d\n", skb->len);
 380                 /* TODO: process it (i.e. BAR) */
 381                 kfree_skb(skb);
 382                 return NULL;
 383         }
 384
 385         ds_bits = wil_rxdesc_ds_bits(d);
 386         if (ds_bits == 1) {
 387                 /*
 388                  * HW bug - in ToDS mode, i.e. Rx on AP side,
 389                  * addresses get swapped
 390                  */
 391                 wil_swap_ethaddr(skb->data);
 392         }
 393
 394         return skb;
 395 }
 396
 397 /**
 398  * allocate and fill up to @count buffers in rx ring
 399  * buffers posted at @swtail
 400  */
 401 static int wil_rx_refill(struct wil6210_priv *wil, int count)
 402 {
 403         struct net_device *ndev = wil_to_ndev(wil);
 404         struct vring *v = &wil->vring_rx;
 405         u32 next_tail;
 406         int rc = 0;
 407         int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
 408                         WIL6210_RTAP_SIZE : 0;
 409
 410         for (; next_tail = wil_vring_next_tail(v),
 411                         (next_tail != v->swhead) && (count-- > 0);
 412                         v->swtail = next_tail) {
 413                 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
 414                 if (rc) {
 415                         wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
 416                                 rc, v->swtail);
 417                         break;
 418                 }
 419         }
 420         iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
 421
 422         return rc;
 423 }
 424
 425 /*
 426  * Pass Rx packet to the netif. Update statistics.
 427  */
 428 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 429 {
 430         int rc;
 431         unsigned int len = skb->len;
 432
 433         if (in_interrupt())
 434                 rc = netif_rx(skb);
 435         else
 436                 rc = netif_rx_ni(skb);
 437
 438         if (likely(rc == NET_RX_SUCCESS)) {
 439                 ndev->stats.rx_packets++;
 440                 ndev->stats.rx_bytes += len;
 441
 442         } else {
 443                 ndev->stats.rx_dropped++;
 444         }
 445 }
 446
 447 /**
 448  * Proceed all completed skb's from Rx VRING
 449  *
 450  * Safe to call from IRQ
 451  */
 452 void wil_rx_handle(struct wil6210_priv *wil)
 453 {
 454         struct net_device *ndev = wil_to_ndev(wil);
 455         struct vring *v = &wil->vring_rx;
 456         struct sk_buff *skb;
 457
 458         if (!v->va) {
 459                 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
 460                 return;
 461         }
 462         wil_dbg_TXRX(wil, "%s()\n", __func__);
 463         while (NULL != (skb = wil_vring_reap_rx(wil, v))) {
 464                 wil_hex_dump_TXRX("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
 465                                   skb->data, skb_headlen(skb), false);
 466
 467                 skb_orphan(skb);
 468
 469                 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 470                         skb->dev = ndev;
 471                         skb_reset_mac_header(skb);
 472                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 473                         skb->pkt_type = PACKET_OTHERHOST;
 474                         skb->protocol = htons(ETH_P_802_2);
 475
 476                 } else {
 477                         skb->protocol = eth_type_trans(skb, ndev);
 478                 }
 479
 480                 wil_netif_rx_any(skb, ndev);
 481         }
 482         wil_rx_refill(wil, v->size);
 483 }
 484
 485 int wil_rx_init(struct wil6210_priv *wil)
 486 {
 487         struct net_device *ndev = wil_to_ndev(wil);
 488         struct wireless_dev *wdev = wil->wdev;
 489         struct vring *vring = &wil->vring_rx;
 490         int rc;
 491         struct wmi_cfg_rx_chain_cmd cmd = {
 492                 .action = WMI_RX_CHAIN_ADD,
 493                 .rx_sw_ring = {
 494                         .max_mpdu_size = cpu_to_le16(RX_BUF_LEN),
 495                 },
 496                 .mid = 0, /* TODO - what is it? */
 497                 .decap_trans_type = WMI_DECAP_TYPE_802_3,
 498         };
 499         struct {
 500                 struct wil6210_mbox_hdr_wmi wmi;
 501                 struct wmi_cfg_rx_chain_done_event evt;
 502         } __packed evt;
 503
 504         vring->size = WIL6210_RX_RING_SIZE;
 505         rc = wil_vring_alloc(wil, vring);
 506         if (rc)
 507                 return rc;
 508
 509         cmd.rx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
 510         cmd.rx_sw_ring.ring_size = cpu_to_le16(vring->size);
 511         if (wdev->iftype == NL80211_IFTYPE_MONITOR) {
 512                 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
 513
 514                 cmd.sniffer_cfg.mode = cpu_to_le32(WMI_SNIFFER_ON);
 515                 if (ch)
 516                         cmd.sniffer_cfg.channel = ch->hw_value - 1;
 517                 cmd.sniffer_cfg.phy_info_mode =
 518                         cpu_to_le32(ndev->type == ARPHRD_IEEE80211_RADIOTAP);
 519                 cmd.sniffer_cfg.phy_support =
 520                         cpu_to_le32((wil->monitor_flags & MONITOR_FLAG_CONTROL)
 521                                     ? WMI_SNIFFER_CP : WMI_SNIFFER_DP);
 522         }
 523         /* typical time for secure PCP is 840ms */
 524         rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd),
 525                       WMI_CFG_RX_CHAIN_DONE_EVENTID, &evt, sizeof(evt), 2000);
 526         if (rc)
 527                 goto err_free;
 528
 529         vring->hwtail = le32_to_cpu(evt.evt.rx_ring_tail_ptr);
 530
 531         wil_dbg(wil, "Rx init: status %d tail 0x%08x\n",
 532                 le32_to_cpu(evt.evt.status), vring->hwtail);
 533
 534         rc = wil_rx_refill(wil, vring->size);
 535         if (rc)
 536                 goto err_free;
 537
 538         return 0;
 539  err_free:
 540         wil_vring_free(wil, vring, 0);
 541
 542         return rc;
 543 }
 544
 545 void wil_rx_fini(struct wil6210_priv *wil)
 546 {
 547         struct vring *vring = &wil->vring_rx;
 548
 549         if (vring->va) {
 550                 int rc;
 551                 struct wmi_cfg_rx_chain_cmd cmd = {
 552                         .action = cpu_to_le32(WMI_RX_CHAIN_DEL),
 553                         .rx_sw_ring = {
 554                                 .max_mpdu_size = cpu_to_le16(RX_BUF_LEN),
 555                         },
 556                 };
 557                 struct {
 558                         struct wil6210_mbox_hdr_wmi wmi;
 559                         struct wmi_cfg_rx_chain_done_event cfg;
 560                 } __packed wmi_rx_cfg_reply;
 561
 562                 rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd),
 563                               WMI_CFG_RX_CHAIN_DONE_EVENTID,
 564                               &wmi_rx_cfg_reply, sizeof(wmi_rx_cfg_reply),
 565                               100);
 566                 wil_vring_free(wil, vring, 0);
 567         }
 568 }
 569
 570 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
 571                       int cid, int tid)
 572 {
 573         int rc;
 574         struct wmi_vring_cfg_cmd cmd = {
 575                 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
 576                 .vring_cfg = {
 577                         .tx_sw_ring = {
 578                                 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
 579                         },
 580                         .ringid = id,
 581                         .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
 582                         .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
 583                         .mac_ctrl = 0,
 584                         .to_resolution = 0,
 585                         .agg_max_wsize = 16,
 586                         .schd_params = {
 587                                 .priority = cpu_to_le16(0),
 588                                 .timeslot_us = cpu_to_le16(0xfff),
 589                         },
 590                 },
 591         };
 592         struct {
 593                 struct wil6210_mbox_hdr_wmi wmi;
 594                 struct wmi_vring_cfg_done_event cmd;
 595         } __packed reply;
 596         struct vring *vring = &wil->vring_tx[id];
 597
 598         if (vring->va) {
 599                 wil_err(wil, "Tx ring [%d] already allocated\n", id);
 600                 rc = -EINVAL;
 601                 goto out;
 602         }
 603
 604         vring->size = size;
 605         rc = wil_vring_alloc(wil, vring);
 606         if (rc)
 607                 goto out;
 608
 609         cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
 610         cmd.vring_cfg.tx_sw_ring.ring_size = cpu_to_le16(vring->size);
 611
 612         rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
 613                       WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
 614         if (rc)
 615                 goto out_free;
 616
 617         if (reply.cmd.status != WMI_VRING_CFG_SUCCESS) {
 618                 wil_err(wil, "Tx config failed, status 0x%02x\n",
 619                         reply.cmd.status);
 620                 goto out_free;
 621         }
 622         vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
 623
 624         return 0;
 625  out_free:
 626         wil_vring_free(wil, vring, 1);
 627  out:
 628
 629         return rc;
 630 }
 631
 632 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
 633 {
 634         struct vring *vring = &wil->vring_tx[id];
 635
 636         if (!vring->va)
 637                 return;
 638
 639         wil_vring_free(wil, vring, 1);
 640 }
 641
 642 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
 643                                        struct sk_buff *skb)
 644 {
 645         struct vring *v = &wil->vring_tx[0];
 646
 647         if (v->va)
 648                 return v;
 649
 650         return NULL;
 651 }
 652
 653 static int wil_tx_desc_map(volatile struct vring_tx_desc *d,
 654                            dma_addr_t pa, u32 len)
 655 {
 656         d->dma.addr_low = lower_32_bits(pa);
 657         d->dma.addr_high = (u16)upper_32_bits(pa);
 658         d->dma.ip_length = 0;
 659         /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
 660         d->dma.b11 = 0/*14 | BIT(7)*/;
 661         d->dma.error = 0;
 662         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
 663         d->dma.length = len;
 664         d->dma.d0 = 0;
 665         d->mac.d[0] = 0;
 666         d->mac.d[1] = 0;
 667         d->mac.d[2] = 0;
 668         d->mac.ucode_cmd = 0;
 669         /* use dst index 0 */
 670         d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
 671                        (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
 672         /* translation type:  0 - bypass; 1 - 802.3; 2 - native wifi */
 673         d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
 674                       (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
 675
 676         return 0;
 677 }
 678
 679 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
 680                         struct sk_buff *skb)
 681 {
 682         struct device *dev = wil_to_dev(wil);
 683         volatile struct vring_tx_desc *d;
 684         u32 swhead = vring->swhead;
 685         int avail = wil_vring_avail_tx(vring);
 686         int nr_frags = skb_shinfo(skb)->nr_frags;
 687         uint f;
 688         int vring_index = vring - wil->vring_tx;
 689         uint i = swhead;
 690         dma_addr_t pa;
 691
 692         wil_dbg_TXRX(wil, "%s()\n", __func__);
 693
 694         if (avail < vring->size/8)
 695                 netif_tx_stop_all_queues(wil_to_ndev(wil));
 696         if (avail < 1 + nr_frags) {
 697                 wil_err(wil, "Tx ring full. No space for %d fragments\n",
 698                         1 + nr_frags);
 699                 return -ENOMEM;
 700         }
 701         d = &(vring->va[i].tx);
 702
 703         /* FIXME FW can accept only unicast frames for the peer */
 704         memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
 705
 706         pa = dma_map_single(dev, skb->data,
 707                         skb_headlen(skb), DMA_TO_DEVICE);
 708
 709         wil_dbg_TXRX(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
 710                      skb->data, (unsigned long long)pa);
 711         wil_hex_dump_TXRX("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
 712                           skb->data, skb_headlen(skb), false);
 713
 714         if (unlikely(dma_mapping_error(dev, pa)))
 715                 return -EINVAL;
 716         /* 1-st segment */
 717         wil_tx_desc_map(d, pa, skb_headlen(skb));
 718         d->mac.d[2] |= ((nr_frags + 1) <<
 719                        MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
 720         /* middle segments */
 721         for (f = 0; f < nr_frags; f++) {
 722                 const struct skb_frag_struct *frag =
 723                                 &skb_shinfo(skb)->frags[f];
 724                 int len = skb_frag_size(frag);
 725                 i = (swhead + f + 1) % vring->size;
 726                 d = &(vring->va[i].tx);
 727                 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
 728                                 DMA_TO_DEVICE);
 729                 if (unlikely(dma_mapping_error(dev, pa)))
 730                         goto dma_error;
 731                 wil_tx_desc_map(d, pa, len);
 732                 vring->ctx[i] = NULL;
 733         }
 734         /* for the last seg only */
 735         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
 736         d->dma.d0 |= BIT(9); /* BUG: undocumented bit */
 737         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
 738         d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
 739
 740         wil_hex_dump_TXRX("Tx ", DUMP_PREFIX_NONE, 32, 4,
 741                           (const void *)d, sizeof(*d), false);
 742
 743         /* advance swhead */
 744         wil_vring_advance_head(vring, nr_frags + 1);
 745         wil_dbg_TXRX(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
 746         iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
 747         /* hold reference to skb
 748          * to prevent skb release before accounting
 749          * in case of immediate "tx done"
 750          */
 751         vring->ctx[i] = skb_get(skb);
 752
 753         return 0;
 754  dma_error:
 755         /* unmap what we have mapped */
 756         /* Note: increment @f to operate with positive index */
 757         for (f++; f > 0; f--) {
 758                 i = (swhead + f) % vring->size;
 759                 d = &(vring->va[i].tx);
 760                 d->dma.status = TX_DMA_STATUS_DU;
 761                 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
 762                 if (vring->ctx[i])
 763                         dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
 764                 else
 765                         dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
 766         }
 767
 768         return -EINVAL;
 769 }
 770
 771
 772 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 773 {
 774         struct wil6210_priv *wil = ndev_to_wil(ndev);
 775         struct vring *vring;
 776         int rc;
 777
 778         wil_dbg_TXRX(wil, "%s()\n", __func__);
 779         if (!test_bit(wil_status_fwready, &wil->status)) {
 780                 wil_err(wil, "FW not ready\n");
 781                 goto drop;
 782         }
 783         if (!test_bit(wil_status_fwconnected, &wil->status)) {
 784                 wil_err(wil, "FW not connected\n");
 785                 goto drop;
 786         }
 787         if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 788                 wil_err(wil, "Xmit in monitor mode not supported\n");
 789                 goto drop;
 790         }
 791         if (skb->protocol == cpu_to_be16(ETH_P_PAE)) {
 792                 rc = wmi_tx_eapol(wil, skb);
 793         } else {
 794                 /* find vring */
 795                 vring = wil_find_tx_vring(wil, skb);
 796                 if (!vring) {
 797                         wil_err(wil, "No Tx VRING available\n");
 798                         goto drop;
 799                 }
 800                 /* set up vring entry */
 801                 rc = wil_tx_vring(wil, vring, skb);
 802         }
 803         switch (rc) {
 804         case 0:
 805                 ndev->stats.tx_packets++;
 806                 ndev->stats.tx_bytes += skb->len;
 807                 dev_kfree_skb_any(skb);
 808                 return NETDEV_TX_OK;
 809         case -ENOMEM:
 810                 return NETDEV_TX_BUSY;
 811         default:
 812                 ; /* goto drop; */
 813                 break;
 814         }
 815  drop:
 816         netif_tx_stop_all_queues(ndev);
 817         ndev->stats.tx_dropped++;
 818         dev_kfree_skb_any(skb);
 819
 820         return NET_XMIT_DROP;
 821 }
 822
 823 /**
 824  * Clean up transmitted skb's from the Tx VRING
 825  *
 826  * Safe to call from IRQ
 827  */
 828 void wil_tx_complete(struct wil6210_priv *wil, int ringid)
 829 {
 830         struct device *dev = wil_to_dev(wil);
 831         struct vring *vring = &wil->vring_tx[ringid];
 832
 833         if (!vring->va) {
 834                 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
 835                 return;
 836         }
 837
 838         wil_dbg_TXRX(wil, "%s(%d)\n", __func__, ringid);
 839
 840         while (!wil_vring_is_empty(vring)) {
 841                 volatile struct vring_tx_desc *d = &vring->va[vring->swtail].tx;
 842                 dma_addr_t pa;
 843                 struct sk_buff *skb;
 844                 if (!(d->dma.status & TX_DMA_STATUS_DU))
 845                         break;
 846
 847                 wil_dbg_TXRX(wil,
 848                              "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
 849                              vring->swtail, d->dma.length, d->dma.status,
 850                              d->dma.error);
 851                 wil_hex_dump_TXRX("TxC ", DUMP_PREFIX_NONE, 32, 4,
 852                                   (const void *)d, sizeof(*d), false);
 853
 854                 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32);
 855                 skb = vring->ctx[vring->swtail];
 856                 if (skb) {
 857                         dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE);
 858                         dev_kfree_skb_any(skb);
 859                         vring->ctx[vring->swtail] = NULL;
 860                 } else {
 861                         dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE);
 862                 }
 863                 d->dma.addr_low = 0;
 864                 d->dma.addr_high = 0;
 865                 d->dma.length = 0;
 866                 d->dma.status = TX_DMA_STATUS_DU;
 867                 vring->swtail = wil_vring_next_tail(vring);
 868         }
 869         if (wil_vring_avail_tx(vring) > vring->size/4)
 870                 netif_tx_wake_all_queues(wil_to_ndev(wil));
 871 }