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

   1 // SPDX-License-Identifier: ISC
   2 /*
   3  * Copyright (c) 2012-2017 Qualcomm Atheros, Inc.
   4  * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
   5  */
   6
   7 #include <linux/etherdevice.h>
   8 #include <net/ieee80211_radiotap.h>
   9 #include <linux/if_arp.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/ip.h>
  12 #include <linux/ipv6.h>
  13 #include <linux/if_vlan.h>
  14 #include <net/ipv6.h>
  15 #include <linux/prefetch.h>
  16
  17 #include "wil6210.h"
  18 #include "wmi.h"
  19 #include "txrx.h"
  20 #include "trace.h"
  21 #include "txrx_edma.h"
  22
  23 bool rx_align_2;
  24 module_param(rx_align_2, bool, 0444);
  25 MODULE_PARM_DESC(rx_align_2, " align Rx buffers on 4*n+2, default - no");
  26
  27 bool rx_large_buf;
  28 module_param(rx_large_buf, bool, 0444);
  29 MODULE_PARM_DESC(rx_large_buf, " allocate 8KB RX buffers, default - no");
  30
  31 /* Drop Tx packets in case Tx ring is full */
  32 bool drop_if_ring_full;
  33
  34 static inline uint wil_rx_snaplen(void)
  35 {
  36         return rx_align_2 ? 6 : 0;
  37 }
  38
  39 /* wil_ring_wmark_low - low watermark for available descriptor space */
  40 static inline int wil_ring_wmark_low(struct wil_ring *ring)
  41 {
  42         return ring->size / 8;
  43 }
  44
  45 /* wil_ring_wmark_high - high watermark for available descriptor space */
  46 static inline int wil_ring_wmark_high(struct wil_ring *ring)
  47 {
  48         return ring->size / 4;
  49 }
  50
  51 /* returns true if num avail descriptors is lower than wmark_low */
  52 static inline int wil_ring_avail_low(struct wil_ring *ring)
  53 {
  54         return wil_ring_avail_tx(ring) < wil_ring_wmark_low(ring);
  55 }
  56
  57 /* returns true if num avail descriptors is higher than wmark_high */
  58 static inline int wil_ring_avail_high(struct wil_ring *ring)
  59 {
  60         return wil_ring_avail_tx(ring) > wil_ring_wmark_high(ring);
  61 }
  62
  63 /* returns true when all tx vrings are empty */
  64 bool wil_is_tx_idle(struct wil6210_priv *wil)
  65 {
  66         int i;
  67         unsigned long data_comp_to;
  68         int min_ring_id = wil_get_min_tx_ring_id(wil);
  69
  70         for (i = min_ring_id; i < WIL6210_MAX_TX_RINGS; i++) {
  71                 struct wil_ring *vring = &wil->ring_tx[i];
  72                 int vring_index = vring - wil->ring_tx;
  73                 struct wil_ring_tx_data *txdata =
  74                         &wil->ring_tx_data[vring_index];
  75
  76                 spin_lock(&txdata->lock);
  77
  78                 if (!vring->va || !txdata->enabled) {
  79                         spin_unlock(&txdata->lock);
  80                         continue;
  81                 }
  82
  83                 data_comp_to = jiffies + msecs_to_jiffies(
  84                                         WIL_DATA_COMPLETION_TO_MS);
  85                 if (test_bit(wil_status_napi_en, wil->status)) {
  86                         while (!wil_ring_is_empty(vring)) {
  87                                 if (time_after(jiffies, data_comp_to)) {
  88                                         wil_dbg_pm(wil,
  89                                                    "TO waiting for idle tx\n");
  90                                         spin_unlock(&txdata->lock);
  91                                         return false;
  92                                 }
  93                                 wil_dbg_ratelimited(wil,
  94                                                     "tx vring is not empty -> NAPI\n");
  95                                 spin_unlock(&txdata->lock);
  96                                 napi_synchronize(&wil->napi_tx);
  97                                 msleep(20);
  98                                 spin_lock(&txdata->lock);
  99                                 if (!vring->va || !txdata->enabled)
 100                                         break;
 101                         }
 102                 }
 103
 104                 spin_unlock(&txdata->lock);
 105         }
 106
 107         return true;
 108 }
 109
 110 static int wil_vring_alloc(struct wil6210_priv *wil, struct wil_ring *vring)
 111 {
 112         struct device *dev = wil_to_dev(wil);
 113         size_t sz = vring->size * sizeof(vring->va[0]);
 114         uint i;
 115
 116         wil_dbg_misc(wil, "vring_alloc:\n");
 117
 118         BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
 119
 120         vring->swhead = 0;
 121         vring->swtail = 0;
 122         vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
 123         if (!vring->ctx) {
 124                 vring->va = NULL;
 125                 return -ENOMEM;
 126         }
 127
 128         /* vring->va should be aligned on its size rounded up to power of 2
 129          * This is granted by the dma_alloc_coherent.
 130          *
 131          * HW has limitation that all vrings addresses must share the same
 132          * upper 16 msb bits part of 48 bits address. To workaround that,
 133          * if we are using more than 32 bit addresses switch to 32 bit
 134          * allocation before allocating vring memory.
 135          *
 136          * There's no check for the return value of dma_set_mask_and_coherent,
 137          * since we assume if we were able to set the mask during
 138          * initialization in this system it will not fail if we set it again
 139          */
 140         if (wil->dma_addr_size > 32)
 141                 dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 142
 143         vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
 144         if (!vring->va) {
 145                 kfree(vring->ctx);
 146                 vring->ctx = NULL;
 147                 return -ENOMEM;
 148         }
 149
 150         if (wil->dma_addr_size > 32)
 151                 dma_set_mask_and_coherent(dev,
 152                                           DMA_BIT_MASK(wil->dma_addr_size));
 153
 154         /* initially, all descriptors are SW owned
 155          * For Tx and Rx, ownership bit is at the same location, thus
 156          * we can use any
 157          */
 158         for (i = 0; i < vring->size; i++) {
 159                 volatile struct vring_tx_desc *_d =
 160                         &vring->va[i].tx.legacy;
 161
 162                 _d->dma.status = TX_DMA_STATUS_DU;
 163         }
 164
 165         wil_dbg_misc(wil, "vring[%d] 0x%p:%pad 0x%p\n", vring->size,
 166                      vring->va, &vring->pa, vring->ctx);
 167
 168         return 0;
 169 }
 170
 171 static void wil_txdesc_unmap(struct device *dev, union wil_tx_desc *desc,
 172                              struct wil_ctx *ctx)
 173 {
 174         struct vring_tx_desc *d = &desc->legacy;
 175         dma_addr_t pa = wil_desc_addr(&d->dma.addr);
 176         u16 dmalen = le16_to_cpu(d->dma.length);
 177
 178         switch (ctx->mapped_as) {
 179         case wil_mapped_as_single:
 180                 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
 181                 break;
 182         case wil_mapped_as_page:
 183                 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
 184                 break;
 185         default:
 186                 break;
 187         }
 188 }
 189
 190 static void wil_vring_free(struct wil6210_priv *wil, struct wil_ring *vring)
 191 {
 192         struct device *dev = wil_to_dev(wil);
 193         size_t sz = vring->size * sizeof(vring->va[0]);
 194
 195         lockdep_assert_held(&wil->mutex);
 196         if (!vring->is_rx) {
 197                 int vring_index = vring - wil->ring_tx;
 198
 199                 wil_dbg_misc(wil, "free Tx vring %d [%d] 0x%p:%pad 0x%p\n",
 200                              vring_index, vring->size, vring->va,
 201                              &vring->pa, vring->ctx);
 202         } else {
 203                 wil_dbg_misc(wil, "free Rx vring [%d] 0x%p:%pad 0x%p\n",
 204                              vring->size, vring->va,
 205                              &vring->pa, vring->ctx);
 206         }
 207
 208         while (!wil_ring_is_empty(vring)) {
 209                 dma_addr_t pa;
 210                 u16 dmalen;
 211                 struct wil_ctx *ctx;
 212
 213                 if (!vring->is_rx) {
 214                         struct vring_tx_desc dd, *d = &dd;
 215                         volatile struct vring_tx_desc *_d =
 216                                         &vring->va[vring->swtail].tx.legacy;
 217
 218                         ctx = &vring->ctx[vring->swtail];
 219                         if (!ctx) {
 220                                 wil_dbg_txrx(wil,
 221                                              "ctx(%d) was already completed\n",
 222                                              vring->swtail);
 223                                 vring->swtail = wil_ring_next_tail(vring);
 224                                 continue;
 225                         }
 226                         *d = *_d;
 227                         wil_txdesc_unmap(dev, (union wil_tx_desc *)d, ctx);
 228                         if (ctx->skb)
 229                                 dev_kfree_skb_any(ctx->skb);
 230                         vring->swtail = wil_ring_next_tail(vring);
 231                 } else { /* rx */
 232                         struct vring_rx_desc dd, *d = &dd;
 233                         volatile struct vring_rx_desc *_d =
 234                                 &vring->va[vring->swhead].rx.legacy;
 235
 236                         ctx = &vring->ctx[vring->swhead];
 237                         *d = *_d;
 238                         pa = wil_desc_addr(&d->dma.addr);
 239                         dmalen = le16_to_cpu(d->dma.length);
 240                         dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
 241                         kfree_skb(ctx->skb);
 242                         wil_ring_advance_head(vring, 1);
 243                 }
 244         }
 245         dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
 246         kfree(vring->ctx);
 247         vring->pa = 0;
 248         vring->va = NULL;
 249         vring->ctx = NULL;
 250 }
 251
 252 /* Allocate one skb for Rx VRING
 253  *
 254  * Safe to call from IRQ
 255  */
 256 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct wil_ring *vring,
 257                                u32 i, int headroom)
 258 {
 259         struct device *dev = wil_to_dev(wil);
 260         unsigned int sz = wil->rx_buf_len + ETH_HLEN + wil_rx_snaplen();
 261         struct vring_rx_desc dd, *d = &dd;
 262         volatile struct vring_rx_desc *_d = &vring->va[i].rx.legacy;
 263         dma_addr_t pa;
 264         struct sk_buff *skb = dev_alloc_skb(sz + headroom);
 265
 266         if (unlikely(!skb))
 267                 return -ENOMEM;
 268
 269         skb_reserve(skb, headroom);
 270         skb_put(skb, sz);
 271
 272         /**
 273          * Make sure that the network stack calculates checksum for packets
 274          * which failed the HW checksum calculation
 275          */
 276         skb->ip_summed = CHECKSUM_NONE;
 277
 278         pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
 279         if (unlikely(dma_mapping_error(dev, pa))) {
 280                 kfree_skb(skb);
 281                 return -ENOMEM;
 282         }
 283
 284         d->dma.d0 = RX_DMA_D0_CMD_DMA_RT | RX_DMA_D0_CMD_DMA_IT;
 285         wil_desc_addr_set(&d->dma.addr, pa);
 286         /* ip_length don't care */
 287         /* b11 don't care */
 288         /* error don't care */
 289         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
 290         d->dma.length = cpu_to_le16(sz);
 291         *_d = *d;
 292         vring->ctx[i].skb = skb;
 293
 294         return 0;
 295 }
 296
 297 /* Adds radiotap header
 298  *
 299  * Any error indicated as "Bad FCS"
 300  *
 301  * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
 302  *  - Rx descriptor: 32 bytes
 303  *  - Phy info
 304  */
 305 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
 306                                        struct sk_buff *skb)
 307 {
 308         struct wil6210_rtap {
 309                 struct ieee80211_radiotap_header rthdr;
 310                 /* fields should be in the order of bits in rthdr.it_present */
 311                 /* flags */
 312                 u8 flags;
 313                 /* channel */
 314                 __le16 chnl_freq __aligned(2);
 315                 __le16 chnl_flags;
 316                 /* MCS */
 317                 u8 mcs_present;
 318                 u8 mcs_flags;
 319                 u8 mcs_index;
 320         } __packed;
 321         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 322         struct wil6210_rtap *rtap;
 323         int rtap_len = sizeof(struct wil6210_rtap);
 324         struct ieee80211_channel *ch = wil->monitor_chandef.chan;
 325
 326         if (skb_headroom(skb) < rtap_len &&
 327             pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
 328                 wil_err(wil, "Unable to expand headroom to %d\n", rtap_len);
 329                 return;
 330         }
 331
 332         rtap = skb_push(skb, rtap_len);
 333         memset(rtap, 0, rtap_len);
 334
 335         rtap->rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
 336         rtap->rthdr.it_len = cpu_to_le16(rtap_len);
 337         rtap->rthdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
 338                         (1 << IEEE80211_RADIOTAP_CHANNEL) |
 339                         (1 << IEEE80211_RADIOTAP_MCS));
 340         if (d->dma.status & RX_DMA_STATUS_ERROR)
 341                 rtap->flags |= IEEE80211_RADIOTAP_F_BADFCS;
 342
 343         rtap->chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
 344         rtap->chnl_flags = cpu_to_le16(0);
 345
 346         rtap->mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
 347         rtap->mcs_flags = 0;
 348         rtap->mcs_index = wil_rxdesc_mcs(d);
 349 }
 350
 351 static bool wil_is_rx_idle(struct wil6210_priv *wil)
 352 {
 353         struct vring_rx_desc *_d;
 354         struct wil_ring *ring = &wil->ring_rx;
 355
 356         _d = (struct vring_rx_desc *)&ring->va[ring->swhead].rx.legacy;
 357         if (_d->dma.status & RX_DMA_STATUS_DU)
 358                 return false;
 359
 360         return true;
 361 }
 362
 363 static int wil_rx_get_cid_by_skb(struct wil6210_priv *wil, struct sk_buff *skb)
 364 {
 365         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 366         int mid = wil_rxdesc_mid(d);
 367         struct wil6210_vif *vif = wil->vifs[mid];
 368         /* cid from DMA descriptor is limited to 3 bits.
 369          * In case of cid>=8, the value would be cid modulo 8 and we need to
 370          * find real cid by locating the transmitter (ta) inside sta array
 371          */
 372         int cid = wil_rxdesc_cid(d);
 373         unsigned int snaplen = wil_rx_snaplen();
 374         struct ieee80211_hdr_3addr *hdr;
 375         int i;
 376         unsigned char *ta;
 377         u8 ftype;
 378
 379         /* in monitor mode there are no connections */
 380         if (vif->wdev.iftype == NL80211_IFTYPE_MONITOR)
 381                 return cid;
 382
 383         ftype = wil_rxdesc_ftype(d) << 2;
 384         if (likely(ftype == IEEE80211_FTYPE_DATA)) {
 385                 if (unlikely(skb->len < ETH_HLEN + snaplen)) {
 386                         wil_err_ratelimited(wil,
 387                                             "Short data frame, len = %d\n",
 388                                             skb->len);
 389                         return -ENOENT;
 390                 }
 391                 ta = wil_skb_get_sa(skb);
 392         } else {
 393                 if (unlikely(skb->len < sizeof(struct ieee80211_hdr_3addr))) {
 394                         wil_err_ratelimited(wil, "Short frame, len = %d\n",
 395                                             skb->len);
 396                         return -ENOENT;
 397                 }
 398                 hdr = (void *)skb->data;
 399                 ta = hdr->addr2;
 400         }
 401
 402         if (wil->max_assoc_sta <= WIL6210_RX_DESC_MAX_CID)
 403                 return cid;
 404
 405         /* assuming no concurrency between AP interfaces and STA interfaces.
 406          * multista is used only in P2P_GO or AP mode. In other modes return
 407          * cid from the rx descriptor
 408          */
 409         if (vif->wdev.iftype != NL80211_IFTYPE_P2P_GO &&
 410             vif->wdev.iftype != NL80211_IFTYPE_AP)
 411                 return cid;
 412
 413         /* For Rx packets cid from rx descriptor is limited to 3 bits (0..7),
 414          * to find the real cid, compare transmitter address with the stored
 415          * stations mac address in the driver sta array
 416          */
 417         for (i = cid; i < wil->max_assoc_sta; i += WIL6210_RX_DESC_MAX_CID) {
 418                 if (wil->sta[i].status != wil_sta_unused &&
 419                     ether_addr_equal(wil->sta[i].addr, ta)) {
 420                         cid = i;
 421                         break;
 422                 }
 423         }
 424         if (i >= wil->max_assoc_sta) {
 425                 wil_err_ratelimited(wil, "Could not find cid for frame with transmit addr = %pM, iftype = %d, frametype = %d, len = %d\n",
 426                                     ta, vif->wdev.iftype, ftype, skb->len);
 427                 cid = -ENOENT;
 428         }
 429
 430         return cid;
 431 }
 432
 433 /* reap 1 frame from @swhead
 434  *
 435  * Rx descriptor copied to skb->cb
 436  *
 437  * Safe to call from IRQ
 438  */
 439 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
 440                                          struct wil_ring *vring)
 441 {
 442         struct device *dev = wil_to_dev(wil);
 443         struct wil6210_vif *vif;
 444         struct net_device *ndev;
 445         volatile struct vring_rx_desc *_d;
 446         struct vring_rx_desc *d;
 447         struct sk_buff *skb;
 448         dma_addr_t pa;
 449         unsigned int snaplen = wil_rx_snaplen();
 450         unsigned int sz = wil->rx_buf_len + ETH_HLEN + snaplen;
 451         u16 dmalen;
 452         u8 ftype;
 453         int cid, mid;
 454         int i;
 455         struct wil_net_stats *stats;
 456
 457         BUILD_BUG_ON(sizeof(struct skb_rx_info) > sizeof(skb->cb));
 458
 459 again:
 460         if (unlikely(wil_ring_is_empty(vring)))
 461                 return NULL;
 462
 463         i = (int)vring->swhead;
 464         _d = &vring->va[i].rx.legacy;
 465         if (unlikely(!(_d->dma.status & RX_DMA_STATUS_DU))) {
 466                 /* it is not error, we just reached end of Rx done area */
 467                 return NULL;
 468         }
 469
 470         skb = vring->ctx[i].skb;
 471         vring->ctx[i].skb = NULL;
 472         wil_ring_advance_head(vring, 1);
 473         if (!skb) {
 474                 wil_err(wil, "No Rx skb at [%d]\n", i);
 475                 goto again;
 476         }
 477         d = wil_skb_rxdesc(skb);
 478         *d = *_d;
 479         pa = wil_desc_addr(&d->dma.addr);
 480
 481         dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
 482         dmalen = le16_to_cpu(d->dma.length);
 483
 484         trace_wil6210_rx(i, d);
 485         wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", i, dmalen);
 486         wil_hex_dump_txrx("RxD ", DUMP_PREFIX_NONE, 32, 4,
 487                           (const void *)d, sizeof(*d), false);
 488
 489         mid = wil_rxdesc_mid(d);
 490         vif = wil->vifs[mid];
 491
 492         if (unlikely(!vif)) {
 493                 wil_dbg_txrx(wil, "skipped RX descriptor with invalid mid %d",
 494                              mid);
 495                 kfree_skb(skb);
 496                 goto again;
 497         }
 498         ndev = vif_to_ndev(vif);
 499         if (unlikely(dmalen > sz)) {
 500                 wil_err_ratelimited(wil, "Rx size too large: %d bytes!\n",
 501                                     dmalen);
 502                 kfree_skb(skb);
 503                 goto again;
 504         }
 505         skb_trim(skb, dmalen);
 506
 507         prefetch(skb->data);
 508
 509         wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
 510                           skb->data, skb_headlen(skb), false);
 511
 512         cid = wil_rx_get_cid_by_skb(wil, skb);
 513         if (cid == -ENOENT) {
 514                 kfree_skb(skb);
 515                 goto again;
 516         }
 517         wil_skb_set_cid(skb, (u8)cid);
 518         stats = &wil->sta[cid].stats;
 519
 520         stats->last_mcs_rx = wil_rxdesc_mcs(d);
 521         if (stats->last_mcs_rx < ARRAY_SIZE(stats->rx_per_mcs))
 522                 stats->rx_per_mcs[stats->last_mcs_rx]++;
 523
 524         /* use radiotap header only if required */
 525         if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
 526                 wil_rx_add_radiotap_header(wil, skb);
 527
 528         /* no extra checks if in sniffer mode */
 529         if (ndev->type != ARPHRD_ETHER)
 530                 return skb;
 531         /* Non-data frames may be delivered through Rx DMA channel (ex: BAR)
 532          * Driver should recognize it by frame type, that is found
 533          * in Rx descriptor. If type is not data, it is 802.11 frame as is
 534          */
 535         ftype = wil_rxdesc_ftype(d) << 2;
 536         if (unlikely(ftype != IEEE80211_FTYPE_DATA)) {
 537                 u8 fc1 = wil_rxdesc_fc1(d);
 538                 int tid = wil_rxdesc_tid(d);
 539                 u16 seq = wil_rxdesc_seq(d);
 540
 541                 wil_dbg_txrx(wil,
 542                              "Non-data frame FC[7:0] 0x%02x MID %d CID %d TID %d Seq 0x%03x\n",
 543                              fc1, mid, cid, tid, seq);
 544                 stats->rx_non_data_frame++;
 545                 if (wil_is_back_req(fc1)) {
 546                         wil_dbg_txrx(wil,
 547                                      "BAR: MID %d CID %d TID %d Seq 0x%03x\n",
 548                                      mid, cid, tid, seq);
 549                         wil_rx_bar(wil, vif, cid, tid, seq);
 550                 } else {
 551                         /* print again all info. One can enable only this
 552                          * without overhead for printing every Rx frame
 553                          */
 554                         wil_dbg_txrx(wil,
 555                                      "Unhandled non-data frame FC[7:0] 0x%02x MID %d CID %d TID %d Seq 0x%03x\n",
 556                                      fc1, mid, cid, tid, seq);
 557                         wil_hex_dump_txrx("RxD ", DUMP_PREFIX_NONE, 32, 4,
 558                                           (const void *)d, sizeof(*d), false);
 559                         wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
 560                                           skb->data, skb_headlen(skb), false);
 561                 }
 562                 kfree_skb(skb);
 563                 goto again;
 564         }
 565
 566         /* L4 IDENT is on when HW calculated checksum, check status
 567          * and in case of error drop the packet
 568          * higher stack layers will handle retransmission (if required)
 569          */
 570         if (likely(d->dma.status & RX_DMA_STATUS_L4I)) {
 571                 /* L4 protocol identified, csum calculated */
 572                 if (likely((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0))
 573                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 574                 /* If HW reports bad checksum, let IP stack re-check it
 575                  * For example, HW don't understand Microsoft IP stack that
 576                  * mis-calculates TCP checksum - if it should be 0x0,
 577                  * it writes 0xffff in violation of RFC 1624
 578                  */
 579                 else
 580                         stats->rx_csum_err++;
 581         }
 582
 583         if (snaplen) {
 584                 /* Packet layout
 585                  * +-------+-------+---------+------------+------+
 586                  * | SA(6) | DA(6) | SNAP(6) | ETHTYPE(2) | DATA |
 587                  * +-------+-------+---------+------------+------+
 588                  * Need to remove SNAP, shifting SA and DA forward
 589                  */
 590                 memmove(skb->data + snaplen, skb->data, 2 * ETH_ALEN);
 591                 skb_pull(skb, snaplen);
 592         }
 593
 594         return skb;
 595 }
 596
 597 /* allocate and fill up to @count buffers in rx ring
 598  * buffers posted at @swtail
 599  * Note: we have a single RX queue for servicing all VIFs, but we
 600  * allocate skbs with headroom according to main interface only. This
 601  * means it will not work with monitor interface together with other VIFs.
 602  * Currently we only support monitor interface on its own without other VIFs,
 603  * and we will need to fix this code once we add support.
 604  */
 605 static int wil_rx_refill(struct wil6210_priv *wil, int count)
 606 {
 607         struct net_device *ndev = wil->main_ndev;
 608         struct wil_ring *v = &wil->ring_rx;
 609         u32 next_tail;
 610         int rc = 0;
 611         int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
 612                         WIL6210_RTAP_SIZE : 0;
 613
 614         for (; next_tail = wil_ring_next_tail(v),
 615              (next_tail != v->swhead) && (count-- > 0);
 616              v->swtail = next_tail) {
 617                 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
 618                 if (unlikely(rc)) {
 619                         wil_err_ratelimited(wil, "Error %d in rx refill[%d]\n",
 620                                             rc, v->swtail);
 621                         break;
 622                 }
 623         }
 624
 625         /* make sure all writes to descriptors (shared memory) are done before
 626          * committing them to HW
 627          */
 628         wmb();
 629
 630         wil_w(wil, v->hwtail, v->swtail);
 631
 632         return rc;
 633 }
 634
 635 /**
 636  * reverse_memcmp - Compare two areas of memory, in reverse order
 637  * @cs: One area of memory
 638  * @ct: Another area of memory
 639  * @count: The size of the area.
 640  *
 641  * Cut'n'paste from original memcmp (see lib/string.c)
 642  * with minimal modifications
 643  */
 644 int reverse_memcmp(const void *cs, const void *ct, size_t count)
 645 {
 646         const unsigned char *su1, *su2;
 647         int res = 0;
 648
 649         for (su1 = cs + count - 1, su2 = ct + count - 1; count > 0;
 650              --su1, --su2, count--) {
 651                 res = *su1 - *su2;
 652                 if (res)
 653                         break;
 654         }
 655         return res;
 656 }
 657
 658 static int wil_rx_crypto_check(struct wil6210_priv *wil, struct sk_buff *skb)
 659 {
 660         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 661         int cid = wil_skb_get_cid(skb);
 662         int tid = wil_rxdesc_tid(d);
 663         int key_id = wil_rxdesc_key_id(d);
 664         int mc = wil_rxdesc_mcast(d);
 665         struct wil_sta_info *s = &wil->sta[cid];
 666         struct wil_tid_crypto_rx *c = mc ? &s->group_crypto_rx :
 667                                       &s->tid_crypto_rx[tid];
 668         struct wil_tid_crypto_rx_single *cc = &c->key_id[key_id];
 669         const u8 *pn = (u8 *)&d->mac.pn_15_0;
 670
 671         if (!cc->key_set) {
 672                 wil_err_ratelimited(wil,
 673                                     "Key missing. CID %d TID %d MCast %d KEY_ID %d\n",
 674                                     cid, tid, mc, key_id);
 675                 return -EINVAL;
 676         }
 677
 678         if (reverse_memcmp(pn, cc->pn, IEEE80211_GCMP_PN_LEN) <= 0) {
 679                 wil_err_ratelimited(wil,
 680                                     "Replay attack. CID %d TID %d MCast %d KEY_ID %d PN %6phN last %6phN\n",
 681                                     cid, tid, mc, key_id, pn, cc->pn);
 682                 return -EINVAL;
 683         }
 684         memcpy(cc->pn, pn, IEEE80211_GCMP_PN_LEN);
 685
 686         return 0;
 687 }
 688
 689 static int wil_rx_error_check(struct wil6210_priv *wil, struct sk_buff *skb,
 690                               struct wil_net_stats *stats)
 691 {
 692         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 693
 694         if ((d->dma.status & RX_DMA_STATUS_ERROR) &&
 695             (d->dma.error & RX_DMA_ERROR_MIC)) {
 696                 stats->rx_mic_error++;
 697                 wil_dbg_txrx(wil, "MIC error, dropping packet\n");
 698                 return -EFAULT;
 699         }
 700
 701         return 0;
 702 }
 703
 704 static void wil_get_netif_rx_params(struct sk_buff *skb, int *cid,
 705                                     int *security)
 706 {
 707         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 708
 709         *cid = wil_skb_get_cid(skb);
 710         *security = wil_rxdesc_security(d);
 711 }
 712
 713 /*
 714  * Check if skb is ptk eapol key message
 715  *
 716  * returns a pointer to the start of the eapol key structure, NULL
 717  * if frame is not PTK eapol key
 718  */
 719 static struct wil_eapol_key *wil_is_ptk_eapol_key(struct wil6210_priv *wil,
 720                                                   struct sk_buff *skb)
 721 {
 722         u8 *buf;
 723         const struct wil_1x_hdr *hdr;
 724         struct wil_eapol_key *key;
 725         u16 key_info;
 726         int len = skb->len;
 727
 728         if (!skb_mac_header_was_set(skb)) {
 729                 wil_err(wil, "mac header was not set\n");
 730                 return NULL;
 731         }
 732
 733         len -= skb_mac_offset(skb);
 734
 735         if (len < sizeof(struct ethhdr) + sizeof(struct wil_1x_hdr) +
 736             sizeof(struct wil_eapol_key))
 737                 return NULL;
 738
 739         buf = skb_mac_header(skb) + sizeof(struct ethhdr);
 740
 741         hdr = (const struct wil_1x_hdr *)buf;
 742         if (hdr->type != WIL_1X_TYPE_EAPOL_KEY)
 743                 return NULL;
 744
 745         key = (struct wil_eapol_key *)(buf + sizeof(struct wil_1x_hdr));
 746         if (key->type != WIL_EAPOL_KEY_TYPE_WPA &&
 747             key->type != WIL_EAPOL_KEY_TYPE_RSN)
 748                 return NULL;
 749
 750         key_info = be16_to_cpu(key->key_info);
 751         if (!(key_info & WIL_KEY_INFO_KEY_TYPE)) /* check if pairwise */
 752                 return NULL;
 753
 754         return key;
 755 }
 756
 757 static bool wil_skb_is_eap_3(struct wil6210_priv *wil, struct sk_buff *skb)
 758 {
 759         struct wil_eapol_key *key;
 760         u16 key_info;
 761
 762         key = wil_is_ptk_eapol_key(wil, skb);
 763         if (!key)
 764                 return false;
 765
 766         key_info = be16_to_cpu(key->key_info);
 767         if (key_info & (WIL_KEY_INFO_MIC |
 768                         WIL_KEY_INFO_ENCR_KEY_DATA)) {
 769                 /* 3/4 of 4-Way Handshake */
 770                 wil_dbg_misc(wil, "EAPOL key message 3\n");
 771                 return true;
 772         }
 773         /* 1/4 of 4-Way Handshake */
 774         wil_dbg_misc(wil, "EAPOL key message 1\n");
 775
 776         return false;
 777 }
 778
 779 static bool wil_skb_is_eap_4(struct wil6210_priv *wil, struct sk_buff *skb)
 780 {
 781         struct wil_eapol_key *key;
 782         u32 *nonce, i;
 783
 784         key = wil_is_ptk_eapol_key(wil, skb);
 785         if (!key)
 786                 return false;
 787
 788         nonce = (u32 *)key->key_nonce;
 789         for (i = 0; i < WIL_EAP_NONCE_LEN / sizeof(u32); i++, nonce++) {
 790                 if (*nonce != 0) {
 791                         /* message 2/4 */
 792                         wil_dbg_misc(wil, "EAPOL key message 2\n");
 793                         return false;
 794                 }
 795         }
 796         wil_dbg_misc(wil, "EAPOL key message 4\n");
 797
 798         return true;
 799 }
 800
 801 void wil_enable_tx_key_worker(struct work_struct *work)
 802 {
 803         struct wil6210_vif *vif = container_of(work,
 804                         struct wil6210_vif, enable_tx_key_worker);
 805         struct wil6210_priv *wil = vif_to_wil(vif);
 806         int rc, cid;
 807
 808         rtnl_lock();
 809         if (vif->ptk_rekey_state != WIL_REKEY_WAIT_M4_SENT) {
 810                 wil_dbg_misc(wil, "Invalid rekey state = %d\n",
 811                              vif->ptk_rekey_state);
 812                 rtnl_unlock();
 813                 return;
 814         }
 815
 816         cid =  wil_find_cid_by_idx(wil, vif->mid, 0);
 817         if (!wil_cid_valid(wil, cid)) {
 818                 wil_err(wil, "Invalid cid = %d\n", cid);
 819                 rtnl_unlock();
 820                 return;
 821         }
 822
 823         wil_dbg_misc(wil, "Apply PTK key after eapol was sent out\n");
 824         rc = wmi_add_cipher_key(vif, 0, wil->sta[cid].addr, 0, NULL,
 825                                 WMI_KEY_USE_APPLY_PTK);
 826
 827         vif->ptk_rekey_state = WIL_REKEY_IDLE;
 828         rtnl_unlock();
 829
 830         if (rc)
 831                 wil_err(wil, "Apply PTK key failed %d\n", rc);
 832 }
 833
 834 void wil_tx_complete_handle_eapol(struct wil6210_vif *vif, struct sk_buff *skb)
 835 {
 836         struct wil6210_priv *wil = vif_to_wil(vif);
 837         struct wireless_dev *wdev = vif_to_wdev(vif);
 838         bool q = false;
 839
 840         if (wdev->iftype != NL80211_IFTYPE_STATION ||
 841             !test_bit(WMI_FW_CAPABILITY_SPLIT_REKEY, wil->fw_capabilities))
 842                 return;
 843
 844         /* check if skb is an EAP message 4/4 */
 845         if (!wil_skb_is_eap_4(wil, skb))
 846                 return;
 847
 848         spin_lock_bh(&wil->eap_lock);
 849         switch (vif->ptk_rekey_state) {
 850         case WIL_REKEY_IDLE:
 851                 /* ignore idle state, can happen due to M4 retransmission */
 852                 break;
 853         case WIL_REKEY_M3_RECEIVED:
 854                 vif->ptk_rekey_state = WIL_REKEY_IDLE;
 855                 break;
 856         case WIL_REKEY_WAIT_M4_SENT:
 857                 q = true;
 858                 break;
 859         default:
 860                 wil_err(wil, "Unknown rekey state = %d",
 861                         vif->ptk_rekey_state);
 862         }
 863         spin_unlock_bh(&wil->eap_lock);
 864
 865         if (q) {
 866                 q = queue_work(wil->wmi_wq, &vif->enable_tx_key_worker);
 867                 wil_dbg_misc(wil, "queue_work of enable_tx_key_worker -> %d\n",
 868                              q);
 869         }
 870 }
 871
 872 static void wil_rx_handle_eapol(struct wil6210_vif *vif, struct sk_buff *skb)
 873 {
 874         struct wil6210_priv *wil = vif_to_wil(vif);
 875         struct wireless_dev *wdev = vif_to_wdev(vif);
 876
 877         if (wdev->iftype != NL80211_IFTYPE_STATION ||
 878             !test_bit(WMI_FW_CAPABILITY_SPLIT_REKEY, wil->fw_capabilities))
 879                 return;
 880
 881         /* check if skb is a EAP message 3/4 */
 882         if (!wil_skb_is_eap_3(wil, skb))
 883                 return;
 884
 885         if (vif->ptk_rekey_state == WIL_REKEY_IDLE)
 886                 vif->ptk_rekey_state = WIL_REKEY_M3_RECEIVED;
 887 }
 888
 889 /*
 890  * Pass Rx packet to the netif. Update statistics.
 891  * Called in softirq context (NAPI poll).
 892  */
 893 void wil_netif_rx(struct sk_buff *skb, struct net_device *ndev, int cid,
 894                   struct wil_net_stats *stats, bool gro)
 895 {
 896         struct wil6210_vif *vif = ndev_to_vif(ndev);
 897         struct wil6210_priv *wil = ndev_to_wil(ndev);
 898         struct wireless_dev *wdev = vif_to_wdev(vif);
 899         unsigned int len = skb->len;
 900         u8 *sa, *da = wil_skb_get_da(skb);
 901         /* here looking for DA, not A1, thus Rxdesc's 'mcast' indication
 902          * is not suitable, need to look at data
 903          */
 904         int mcast = is_multicast_ether_addr(da);
 905         struct sk_buff *xmit_skb = NULL;
 906
 907         if (wdev->iftype == NL80211_IFTYPE_STATION) {
 908                 sa = wil_skb_get_sa(skb);
 909                 if (mcast && ether_addr_equal(sa, ndev->dev_addr)) {
 910                         /* mcast packet looped back to us */
 911                         dev_kfree_skb(skb);
 912                         ndev->stats.rx_dropped++;
 913                         stats->rx_dropped++;
 914                         wil_dbg_txrx(wil, "Rx drop %d bytes\n", len);
 915                         return;
 916                 }
 917         } else if (wdev->iftype == NL80211_IFTYPE_AP && !vif->ap_isolate) {
 918                 if (mcast) {
 919                         /* send multicast frames both to higher layers in
 920                          * local net stack and back to the wireless medium
 921                          */
 922                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
 923                 } else {
 924                         int xmit_cid = wil_find_cid(wil, vif->mid, da);
 925
 926                         if (xmit_cid >= 0) {
 927                                 /* The destination station is associated to
 928                                  * this AP (in this VLAN), so send the frame
 929                                  * directly to it and do not pass it to local
 930                                  * net stack.
 931                                  */
 932                                 xmit_skb = skb;
 933                                 skb = NULL;
 934                         }
 935                 }
 936         }
 937         if (xmit_skb) {
 938                 /* Send to wireless media and increase priority by 256 to
 939                  * keep the received priority instead of reclassifying
 940                  * the frame (see cfg80211_classify8021d).
 941                  */
 942                 xmit_skb->dev = ndev;
 943                 xmit_skb->priority += 256;
 944                 xmit_skb->protocol = htons(ETH_P_802_3);
 945                 skb_reset_network_header(xmit_skb);
 946                 skb_reset_mac_header(xmit_skb);
 947                 wil_dbg_txrx(wil, "Rx -> Tx %d bytes\n", len);
 948                 dev_queue_xmit(xmit_skb);
 949         }
 950
 951         if (skb) { /* deliver to local stack */
 952                 skb->protocol = eth_type_trans(skb, ndev);
 953                 skb->dev = ndev;
 954
 955                 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
 956                         wil_rx_handle_eapol(vif, skb);
 957
 958                 if (gro)
 959                         napi_gro_receive(&wil->napi_rx, skb);
 960                 else
 961                         netif_rx(skb);
 962         }
 963         ndev->stats.rx_packets++;
 964         stats->rx_packets++;
 965         ndev->stats.rx_bytes += len;
 966         stats->rx_bytes += len;
 967         if (mcast)
 968                 ndev->stats.multicast++;
 969 }
 970
 971 void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 972 {
 973         int cid, security;
 974         struct wil6210_priv *wil = ndev_to_wil(ndev);
 975         struct wil_net_stats *stats;
 976
 977         wil->txrx_ops.get_netif_rx_params(skb, &cid, &security);
 978
 979         stats = &wil->sta[cid].stats;
 980
 981         skb_orphan(skb);
 982
 983         if (security && (wil->txrx_ops.rx_crypto_check(wil, skb) != 0)) {
 984                 wil_dbg_txrx(wil, "Rx drop %d bytes\n", skb->len);
 985                 dev_kfree_skb(skb);
 986                 ndev->stats.rx_dropped++;
 987                 stats->rx_replay++;
 988                 stats->rx_dropped++;
 989                 return;
 990         }
 991
 992         /* check errors reported by HW and update statistics */
 993         if (unlikely(wil->txrx_ops.rx_error_check(wil, skb, stats))) {
 994                 dev_kfree_skb(skb);
 995                 return;
 996         }
 997
 998         wil_netif_rx(skb, ndev, cid, stats, true);
 999 }
1000
1001 /* Proceed all completed skb's from Rx VRING
1002  *
1003  * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
1004  */
1005 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
1006 {
1007         struct net_device *ndev = wil->main_ndev;
1008         struct wireless_dev *wdev = ndev->ieee80211_ptr;
1009         struct wil_ring *v = &wil->ring_rx;
1010         struct sk_buff *skb;
1011
1012         if (unlikely(!v->va)) {
1013                 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
1014                 return;
1015         }
1016         wil_dbg_txrx(wil, "rx_handle\n");
1017         while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
1018                 (*quota)--;
1019
1020                 /* monitor is currently supported on main interface only */
1021                 if (wdev->iftype == NL80211_IFTYPE_MONITOR) {
1022                         skb->dev = ndev;
1023                         skb_reset_mac_header(skb);
1024                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1025                         skb->pkt_type = PACKET_OTHERHOST;
1026                         skb->protocol = htons(ETH_P_802_2);
1027                         wil_netif_rx_any(skb, ndev);
1028                 } else {
1029                         wil_rx_reorder(wil, skb);
1030                 }
1031         }
1032         wil_rx_refill(wil, v->size);
1033 }
1034
1035 static void wil_rx_buf_len_init(struct wil6210_priv *wil)
1036 {
1037         wil->rx_buf_len = rx_large_buf ?
1038                 WIL_MAX_ETH_MTU : TXRX_BUF_LEN_DEFAULT - WIL_MAX_MPDU_OVERHEAD;
1039         if (mtu_max > wil->rx_buf_len) {
1040                 /* do not allow RX buffers to be smaller than mtu_max, for
1041                  * backward compatibility (mtu_max parameter was also used
1042                  * to support receiving large packets)
1043                  */
1044                 wil_info(wil, "Override RX buffer to mtu_max(%d)\n", mtu_max);
1045                 wil->rx_buf_len = mtu_max;
1046         }
1047 }
1048
1049 static int wil_rx_init(struct wil6210_priv *wil, uint order)
1050 {
1051         struct wil_ring *vring = &wil->ring_rx;
1052         int rc;
1053
1054         wil_dbg_misc(wil, "rx_init\n");
1055
1056         if (vring->va) {
1057                 wil_err(wil, "Rx ring already allocated\n");
1058                 return -EINVAL;
1059         }
1060
1061         wil_rx_buf_len_init(wil);
1062
1063         vring->size = 1 << order;
1064         vring->is_rx = true;
1065         rc = wil_vring_alloc(wil, vring);
1066         if (rc)
1067                 return rc;
1068
1069         rc = wmi_rx_chain_add(wil, vring);
1070         if (rc)
1071                 goto err_free;
1072
1073         rc = wil_rx_refill(wil, vring->size);
1074         if (rc)
1075                 goto err_free;
1076
1077         return 0;
1078  err_free:
1079         wil_vring_free(wil, vring);
1080
1081         return rc;
1082 }
1083
1084 static void wil_rx_fini(struct wil6210_priv *wil)
1085 {
1086         struct wil_ring *vring = &wil->ring_rx;
1087
1088         wil_dbg_misc(wil, "rx_fini\n");
1089
1090         if (vring->va)
1091                 wil_vring_free(wil, vring);
1092 }
1093
1094 static int wil_tx_desc_map(union wil_tx_desc *desc, dma_addr_t pa,
1095                            u32 len, int vring_index)
1096 {
1097         struct vring_tx_desc *d = &desc->legacy;
1098
1099         wil_desc_addr_set(&d->dma.addr, pa);
1100         d->dma.ip_length = 0;
1101         /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
1102         d->dma.b11 = 0/*14 | BIT(7)*/;
1103         d->dma.error = 0;
1104         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
1105         d->dma.length = cpu_to_le16((u16)len);
1106         d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
1107         d->mac.d[0] = 0;
1108         d->mac.d[1] = 0;
1109         d->mac.d[2] = 0;
1110         d->mac.ucode_cmd = 0;
1111         /* translation type:  0 - bypass; 1 - 802.3; 2 - native wifi */
1112         d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
1113                       (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
1114
1115         return 0;
1116 }
1117
1118 void wil_tx_data_init(struct wil_ring_tx_data *txdata)
1119 {
1120         spin_lock_bh(&txdata->lock);
1121         txdata->dot1x_open = false;
1122         txdata->enabled = 0;
1123         txdata->idle = 0;
1124         txdata->last_idle = 0;
1125         txdata->begin = 0;
1126         txdata->agg_wsize = 0;
1127         txdata->agg_timeout = 0;
1128         txdata->agg_amsdu = 0;
1129         txdata->addba_in_progress = false;
1130         txdata->mid = U8_MAX;
1131         spin_unlock_bh(&txdata->lock);
1132 }
1133
1134 static int wil_vring_init_tx(struct wil6210_vif *vif, int id, int size,
1135                              int cid, int tid)
1136 {
1137         struct wil6210_priv *wil = vif_to_wil(vif);
1138         int rc;
1139         struct wmi_vring_cfg_cmd cmd = {
1140                 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
1141                 .vring_cfg = {
1142                         .tx_sw_ring = {
1143                                 .max_mpdu_size =
1144                                         cpu_to_le16(wil_mtu2macbuf(mtu_max)),
1145                                 .ring_size = cpu_to_le16(size),
1146                         },
1147                         .ringid = id,
1148                         .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
1149                         .mac_ctrl = 0,
1150                         .to_resolution = 0,
1151                         .agg_max_wsize = 0,
1152                         .schd_params = {
1153                                 .priority = cpu_to_le16(0),
1154                                 .timeslot_us = cpu_to_le16(0xfff),
1155                         },
1156                 },
1157         };
1158         struct {
1159                 struct wmi_cmd_hdr wmi;
1160                 struct wmi_vring_cfg_done_event cmd;
1161         } __packed reply = {
1162                 .cmd = {.status = WMI_FW_STATUS_FAILURE},
1163         };
1164         struct wil_ring *vring = &wil->ring_tx[id];
1165         struct wil_ring_tx_data *txdata = &wil->ring_tx_data[id];
1166
1167         if (cid >= WIL6210_RX_DESC_MAX_CID) {
1168                 cmd.vring_cfg.cidxtid = CIDXTID_EXTENDED_CID_TID;
1169                 cmd.vring_cfg.cid = cid;
1170                 cmd.vring_cfg.tid = tid;
1171         } else {
1172                 cmd.vring_cfg.cidxtid = mk_cidxtid(cid, tid);
1173         }
1174
1175         wil_dbg_misc(wil, "vring_init_tx: max_mpdu_size %d\n",
1176                      cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
1177         lockdep_assert_held(&wil->mutex);
1178
1179         if (vring->va) {
1180                 wil_err(wil, "Tx ring [%d] already allocated\n", id);
1181                 rc = -EINVAL;
1182                 goto out;
1183         }
1184
1185         wil_tx_data_init(txdata);
1186         vring->is_rx = false;
1187         vring->size = size;
1188         rc = wil_vring_alloc(wil, vring);
1189         if (rc)
1190                 goto out;
1191
1192         wil->ring2cid_tid[id][0] = cid;
1193         wil->ring2cid_tid[id][1] = tid;
1194
1195         cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
1196
1197         if (!vif->privacy)
1198                 txdata->dot1x_open = true;
1199         rc = wmi_call(wil, WMI_VRING_CFG_CMDID, vif->mid, &cmd, sizeof(cmd),
1200                       WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply),
1201                       WIL_WMI_CALL_GENERAL_TO_MS);
1202         if (rc)
1203                 goto out_free;
1204
1205         if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
1206                 wil_err(wil, "Tx config failed, status 0x%02x\n",
1207                         reply.cmd.status);
1208                 rc = -EINVAL;
1209                 goto out_free;
1210         }
1211
1212         spin_lock_bh(&txdata->lock);
1213         vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
1214         txdata->mid = vif->mid;
1215         txdata->enabled = 1;
1216         spin_unlock_bh(&txdata->lock);
1217
1218         if (txdata->dot1x_open && (agg_wsize >= 0))
1219                 wil_addba_tx_request(wil, id, agg_wsize);
1220
1221         return 0;
1222  out_free:
1223         spin_lock_bh(&txdata->lock);
1224         txdata->dot1x_open = false;
1225         txdata->enabled = 0;
1226         spin_unlock_bh(&txdata->lock);
1227         wil_vring_free(wil, vring);
1228         wil->ring2cid_tid[id][0] = wil->max_assoc_sta;
1229         wil->ring2cid_tid[id][1] = 0;
1230
1231  out:
1232
1233         return rc;
1234 }
1235
1236 static int wil_tx_vring_modify(struct wil6210_vif *vif, int ring_id, int cid,
1237                                int tid)
1238 {
1239         struct wil6210_priv *wil = vif_to_wil(vif);
1240         int rc;
1241         struct wmi_vring_cfg_cmd cmd = {
1242                 .action = cpu_to_le32(WMI_VRING_CMD_MODIFY),
1243                 .vring_cfg = {
1244                         .tx_sw_ring = {
1245                                 .max_mpdu_size =
1246                                         cpu_to_le16(wil_mtu2macbuf(mtu_max)),
1247                                 .ring_size = 0,
1248                         },
1249                         .ringid = ring_id,
1250                         .cidxtid = mk_cidxtid(cid, tid),
1251                         .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
1252                         .mac_ctrl = 0,
1253                         .to_resolution = 0,
1254                         .agg_max_wsize = 0,
1255                         .schd_params = {
1256                                 .priority = cpu_to_le16(0),
1257                                 .timeslot_us = cpu_to_le16(0xfff),
1258                         },
1259                 },
1260         };
1261         struct {
1262                 struct wmi_cmd_hdr wmi;
1263                 struct wmi_vring_cfg_done_event cmd;
1264         } __packed reply = {
1265                 .cmd = {.status = WMI_FW_STATUS_FAILURE},
1266         };
1267         struct wil_ring *vring = &wil->ring_tx[ring_id];
1268         struct wil_ring_tx_data *txdata = &wil->ring_tx_data[ring_id];
1269
1270         wil_dbg_misc(wil, "vring_modify: ring %d cid %d tid %d\n", ring_id,
1271                      cid, tid);
1272         lockdep_assert_held(&wil->mutex);
1273
1274         if (!vring->va) {
1275                 wil_err(wil, "Tx ring [%d] not allocated\n", ring_id);
1276                 return -EINVAL;
1277         }
1278
1279         if (wil->ring2cid_tid[ring_id][0] != cid ||
1280             wil->ring2cid_tid[ring_id][1] != tid) {
1281                 wil_err(wil, "ring info does not match cid=%u tid=%u\n",
1282                         wil->ring2cid_tid[ring_id][0],
1283                         wil->ring2cid_tid[ring_id][1]);
1284         }
1285
1286         cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
1287
1288         rc = wmi_call(wil, WMI_VRING_CFG_CMDID, vif->mid, &cmd, sizeof(cmd),
1289                       WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply),
1290                       WIL_WMI_CALL_GENERAL_TO_MS);
1291         if (rc)
1292                 goto fail;
1293
1294         if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
1295                 wil_err(wil, "Tx modify failed, status 0x%02x\n",
1296                         reply.cmd.status);
1297                 rc = -EINVAL;
1298                 goto fail;
1299         }
1300
1301         /* set BA aggregation window size to 0 to force a new BA with the
1302          * new AP
1303          */
1304         txdata->agg_wsize = 0;
1305         if (txdata->dot1x_open && agg_wsize >= 0)
1306                 wil_addba_tx_request(wil, ring_id, agg_wsize);
1307
1308         return 0;
1309 fail:
1310         spin_lock_bh(&txdata->lock);
1311         txdata->dot1x_open = false;
1312         txdata->enabled = 0;
1313         spin_unlock_bh(&txdata->lock);
1314         wil->ring2cid_tid[ring_id][0] = wil->max_assoc_sta;
1315         wil->ring2cid_tid[ring_id][1] = 0;
1316         return rc;
1317 }
1318
1319 int wil_vring_init_bcast(struct wil6210_vif *vif, int id, int size)
1320 {
1321         struct wil6210_priv *wil = vif_to_wil(vif);
1322         int rc;
1323         struct wmi_bcast_vring_cfg_cmd cmd = {
1324                 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
1325                 .vring_cfg = {
1326                         .tx_sw_ring = {
1327                                 .max_mpdu_size =
1328                                         cpu_to_le16(wil_mtu2macbuf(mtu_max)),
1329                                 .ring_size = cpu_to_le16(size),
1330                         },
1331                         .ringid = id,
1332                         .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
1333                 },
1334         };
1335         struct {
1336                 struct wmi_cmd_hdr wmi;
1337                 struct wmi_vring_cfg_done_event cmd;
1338         } __packed reply = {
1339                 .cmd = {.status = WMI_FW_STATUS_FAILURE},
1340         };
1341         struct wil_ring *vring = &wil->ring_tx[id];
1342         struct wil_ring_tx_data *txdata = &wil->ring_tx_data[id];
1343
1344         wil_dbg_misc(wil, "vring_init_bcast: max_mpdu_size %d\n",
1345                      cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
1346         lockdep_assert_held(&wil->mutex);
1347
1348         if (vring->va) {
1349                 wil_err(wil, "Tx ring [%d] already allocated\n", id);
1350                 rc = -EINVAL;
1351                 goto out;
1352         }
1353
1354         wil_tx_data_init(txdata);
1355         vring->is_rx = false;
1356         vring->size = size;
1357         rc = wil_vring_alloc(wil, vring);
1358         if (rc)
1359                 goto out;
1360
1361         wil->ring2cid_tid[id][0] = wil->max_assoc_sta; /* CID */
1362         wil->ring2cid_tid[id][1] = 0; /* TID */
1363
1364         cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
1365
1366         if (!vif->privacy)
1367                 txdata->dot1x_open = true;
1368         rc = wmi_call(wil, WMI_BCAST_VRING_CFG_CMDID, vif->mid,
1369                       &cmd, sizeof(cmd),
1370                       WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply),
1371                       WIL_WMI_CALL_GENERAL_TO_MS);
1372         if (rc)
1373                 goto out_free;
1374
1375         if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
1376                 wil_err(wil, "Tx config failed, status 0x%02x\n",
1377                         reply.cmd.status);
1378                 rc = -EINVAL;
1379                 goto out_free;
1380         }
1381
1382         spin_lock_bh(&txdata->lock);
1383         vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
1384         txdata->mid = vif->mid;
1385         txdata->enabled = 1;
1386         spin_unlock_bh(&txdata->lock);
1387
1388         return 0;
1389  out_free:
1390         spin_lock_bh(&txdata->lock);
1391         txdata->enabled = 0;
1392         txdata->dot1x_open = false;
1393         spin_unlock_bh(&txdata->lock);
1394         wil_vring_free(wil, vring);
1395  out:
1396
1397         return rc;
1398 }
1399
1400 static struct wil_ring *wil_find_tx_ucast(struct wil6210_priv *wil,
1401                                           struct wil6210_vif *vif,
1402                                           struct sk_buff *skb)
1403 {
1404         int i, cid;
1405         const u8 *da = wil_skb_get_da(skb);
1406         int min_ring_id = wil_get_min_tx_ring_id(wil);
1407
1408         cid = wil_find_cid(wil, vif->mid, da);
1409
1410         if (cid < 0 || cid >= wil->max_assoc_sta)
1411                 return NULL;
1412
1413         /* TODO: fix for multiple TID */
1414         for (i = min_ring_id; i < ARRAY_SIZE(wil->ring2cid_tid); i++) {
1415                 if (!wil->ring_tx_data[i].dot1x_open &&
1416                     skb->protocol != cpu_to_be16(ETH_P_PAE))
1417                         continue;
1418                 if (wil->ring2cid_tid[i][0] == cid) {
1419                         struct wil_ring *v = &wil->ring_tx[i];
1420                         struct wil_ring_tx_data *txdata = &wil->ring_tx_data[i];
1421
1422                         wil_dbg_txrx(wil, "find_tx_ucast: (%pM) -> [%d]\n",
1423                                      da, i);
1424                         if (v->va && txdata->enabled) {
1425                                 return v;
1426                         } else {
1427                                 wil_dbg_txrx(wil,
1428                                              "find_tx_ucast: vring[%d] not valid\n",
1429                                              i);
1430                                 return NULL;
1431                         }
1432                 }
1433         }
1434
1435         return NULL;
1436 }
1437
1438 static int wil_tx_ring(struct wil6210_priv *wil, struct wil6210_vif *vif,
1439                        struct wil_ring *ring, struct sk_buff *skb);
1440
1441 static struct wil_ring *wil_find_tx_ring_sta(struct wil6210_priv *wil,
1442                                              struct wil6210_vif *vif,
1443                                              struct sk_buff *skb)
1444 {
1445         struct wil_ring *ring;
1446         int i;
1447         u8 cid;
1448         struct wil_ring_tx_data  *txdata;
1449         int min_ring_id = wil_get_min_tx_ring_id(wil);
1450
1451         /* In the STA mode, it is expected to have only 1 VRING
1452          * for the AP we connected to.
1453          * find 1-st vring eligible for this skb and use it.
1454          */
1455         for (i = min_ring_id; i < WIL6210_MAX_TX_RINGS; i++) {
1456                 ring = &wil->ring_tx[i];
1457                 txdata = &wil->ring_tx_data[i];
1458                 if (!ring->va || !txdata->enabled || txdata->mid != vif->mid)
1459                         continue;
1460
1461                 cid = wil->ring2cid_tid[i][0];
1462                 if (cid >= wil->max_assoc_sta) /* skip BCAST */
1463                         continue;
1464
1465                 if (!wil->ring_tx_data[i].dot1x_open &&
1466                     skb->protocol != cpu_to_be16(ETH_P_PAE))
1467                         continue;
1468
1469                 wil_dbg_txrx(wil, "Tx -> ring %d\n", i);
1470
1471                 return ring;
1472         }
1473
1474         wil_dbg_txrx(wil, "Tx while no rings active?\n");
1475
1476         return NULL;
1477 }
1478
1479 /* Use one of 2 strategies:
1480  *
1481  * 1. New (real broadcast):
1482  *    use dedicated broadcast vring
1483  * 2. Old (pseudo-DMS):
1484  *    Find 1-st vring and return it;
1485  *    duplicate skb and send it to other active vrings;
1486  *    in all cases override dest address to unicast peer's address
1487  * Use old strategy when new is not supported yet:
1488  *  - for PBSS
1489  */
1490 static struct wil_ring *wil_find_tx_bcast_1(struct wil6210_priv *wil,
1491                                             struct wil6210_vif *vif,
1492                                             struct sk_buff *skb)
1493 {
1494         struct wil_ring *v;
1495         struct wil_ring_tx_data *txdata;
1496         int i = vif->bcast_ring;
1497
1498         if (i < 0)
1499                 return NULL;
1500         v = &wil->ring_tx[i];
1501         txdata = &wil->ring_tx_data[i];
1502         if (!v->va || !txdata->enabled)
1503                 return NULL;
1504         if (!wil->ring_tx_data[i].dot1x_open &&
1505             skb->protocol != cpu_to_be16(ETH_P_PAE))
1506                 return NULL;
1507
1508         return v;
1509 }
1510
1511 /* apply multicast to unicast only for ARP and IP packets
1512  * (see NL80211_CMD_SET_MULTICAST_TO_UNICAST for more info)
1513  */
1514 static bool wil_check_multicast_to_unicast(struct wil6210_priv *wil,
1515                                            struct sk_buff *skb)
1516 {
1517         const struct ethhdr *eth = (void *)skb->data;
1518         const struct vlan_ethhdr *ethvlan = (void *)skb->data;
1519         __be16 ethertype;
1520
1521         if (!wil->multicast_to_unicast)
1522                 return false;
1523
1524         /* multicast to unicast conversion only for some payload */
1525         ethertype = eth->h_proto;
1526         if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
1527                 ethertype = ethvlan->h_vlan_encapsulated_proto;
1528         switch (ethertype) {
1529         case htons(ETH_P_ARP):
1530         case htons(ETH_P_IP):
1531         case htons(ETH_P_IPV6):
1532                 break;
1533         default:
1534                 return false;
1535         }
1536
1537         return true;
1538 }
1539
1540 static void wil_set_da_for_vring(struct wil6210_priv *wil,
1541                                  struct sk_buff *skb, int vring_index)
1542 {
1543         u8 *da = wil_skb_get_da(skb);
1544         int cid = wil->ring2cid_tid[vring_index][0];
1545
1546         ether_addr_copy(da, wil->sta[cid].addr);
1547 }
1548
1549 static struct wil_ring *wil_find_tx_bcast_2(struct wil6210_priv *wil,
1550                                             struct wil6210_vif *vif,
1551                                             struct sk_buff *skb)
1552 {
1553         struct wil_ring *v, *v2;
1554         struct sk_buff *skb2;
1555         int i;
1556         u8 cid;
1557         const u8 *src = wil_skb_get_sa(skb);
1558         struct wil_ring_tx_data *txdata, *txdata2;
1559         int min_ring_id = wil_get_min_tx_ring_id(wil);
1560
1561         /* find 1-st vring eligible for data */
1562         for (i = min_ring_id; i < WIL6210_MAX_TX_RINGS; i++) {
1563                 v = &wil->ring_tx[i];
1564                 txdata = &wil->ring_tx_data[i];
1565                 if (!v->va || !txdata->enabled || txdata->mid != vif->mid)
1566                         continue;
1567
1568                 cid = wil->ring2cid_tid[i][0];
1569                 if (cid >= wil->max_assoc_sta) /* skip BCAST */
1570                         continue;
1571                 if (!wil->ring_tx_data[i].dot1x_open &&
1572                     skb->protocol != cpu_to_be16(ETH_P_PAE))
1573                         continue;
1574
1575                 /* don't Tx back to source when re-routing Rx->Tx at the AP */
1576                 if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN))
1577                         continue;
1578
1579                 goto found;
1580         }
1581
1582         wil_dbg_txrx(wil, "Tx while no vrings active?\n");
1583
1584         return NULL;
1585
1586 found:
1587         wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
1588         wil_set_da_for_vring(wil, skb, i);
1589
1590         /* find other active vrings and duplicate skb for each */
1591         for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
1592                 v2 = &wil->ring_tx[i];
1593                 txdata2 = &wil->ring_tx_data[i];
1594                 if (!v2->va || txdata2->mid != vif->mid)
1595                         continue;
1596                 cid = wil->ring2cid_tid[i][0];
1597                 if (cid >= wil->max_assoc_sta) /* skip BCAST */
1598                         continue;
1599                 if (!wil->ring_tx_data[i].dot1x_open &&
1600                     skb->protocol != cpu_to_be16(ETH_P_PAE))
1601                         continue;
1602
1603                 if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN))
1604                         continue;
1605
1606                 skb2 = skb_copy(skb, GFP_ATOMIC);
1607                 if (skb2) {
1608                         wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
1609                         wil_set_da_for_vring(wil, skb2, i);
1610                         wil_tx_ring(wil, vif, v2, skb2);
1611                         /* successful call to wil_tx_ring takes skb2 ref */
1612                         dev_kfree_skb_any(skb2);
1613                 } else {
1614                         wil_err(wil, "skb_copy failed\n");
1615                 }
1616         }
1617
1618         return v;
1619 }
1620
1621 static inline
1622 void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags)
1623 {
1624         d->mac.d[2] |= (nr_frags << MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
1625 }
1626
1627 /* Sets the descriptor @d up for csum and/or TSO offloading. The corresponding
1628  * @skb is used to obtain the protocol and headers length.
1629  * @tso_desc_type is a descriptor type for TSO: 0 - a header, 1 - first data,
1630  * 2 - middle, 3 - last descriptor.
1631  */
1632
1633 static void wil_tx_desc_offload_setup_tso(struct vring_tx_desc *d,
1634                                           struct sk_buff *skb,
1635                                           int tso_desc_type, bool is_ipv4,
1636                                           int tcp_hdr_len, int skb_net_hdr_len)
1637 {
1638         d->dma.b11 = ETH_HLEN; /* MAC header length */
1639         d->dma.b11 |= is_ipv4 << DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS;
1640
1641         d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
1642         /* L4 header len: TCP header length */
1643         d->dma.d0 |= (tcp_hdr_len & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
1644
1645         /* Setup TSO: bit and desc type */
1646         d->dma.d0 |= (BIT(DMA_CFG_DESC_TX_0_TCP_SEG_EN_POS)) |
1647                 (tso_desc_type << DMA_CFG_DESC_TX_0_SEGMENT_BUF_DETAILS_POS);
1648         d->dma.d0 |= (is_ipv4 << DMA_CFG_DESC_TX_0_IPV4_CHECKSUM_EN_POS);
1649
1650         d->dma.ip_length = skb_net_hdr_len;
1651         /* Enable TCP/UDP checksum */
1652         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
1653         /* Calculate pseudo-header */
1654         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
1655 }
1656
1657 /* Sets the descriptor @d up for csum. The corresponding
1658  * @skb is used to obtain the protocol and headers length.
1659  * Returns the protocol: 0 - not TCP, 1 - TCPv4, 2 - TCPv6.
1660  * Note, if d==NULL, the function only returns the protocol result.
1661  *
1662  * It is very similar to previous wil_tx_desc_offload_setup_tso. This
1663  * is "if unrolling" to optimize the critical path.
1664  */
1665
1666 static int wil_tx_desc_offload_setup(struct vring_tx_desc *d,
1667                                      struct sk_buff *skb){
1668         int protocol;
1669
1670         if (skb->ip_summed != CHECKSUM_PARTIAL)
1671                 return 0;
1672
1673         d->dma.b11 = ETH_HLEN; /* MAC header length */
1674
1675         switch (skb->protocol) {
1676         case cpu_to_be16(ETH_P_IP):
1677                 protocol = ip_hdr(skb)->protocol;
1678                 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
1679                 break;
1680         case cpu_to_be16(ETH_P_IPV6):
1681                 protocol = ipv6_hdr(skb)->nexthdr;
1682                 break;
1683         default:
1684                 return -EINVAL;
1685         }
1686
1687         switch (protocol) {
1688         case IPPROTO_TCP:
1689                 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
1690                 /* L4 header len: TCP header length */
1691                 d->dma.d0 |=
1692                 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
1693                 break;
1694         case IPPROTO_UDP:
1695                 /* L4 header len: UDP header length */
1696                 d->dma.d0 |=
1697                 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
1698                 break;
1699         default:
1700                 return -EINVAL;
1701         }
1702
1703         d->dma.ip_length = skb_network_header_len(skb);
1704         /* Enable TCP/UDP checksum */
1705         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
1706         /* Calculate pseudo-header */
1707         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
1708
1709         return 0;
1710 }
1711
1712 static inline void wil_tx_last_desc(struct vring_tx_desc *d)
1713 {
1714         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS) |
1715               BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS) |
1716               BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
1717 }
1718
1719 static inline void wil_set_tx_desc_last_tso(volatile struct vring_tx_desc *d)
1720 {
1721         d->dma.d0 |= wil_tso_type_lst <<
1722                   DMA_CFG_DESC_TX_0_SEGMENT_BUF_DETAILS_POS;
1723 }
1724
1725 static int __wil_tx_vring_tso(struct wil6210_priv *wil, struct wil6210_vif *vif,
1726                               struct wil_ring *vring, struct sk_buff *skb)
1727 {
1728         struct device *dev = wil_to_dev(wil);
1729
1730         /* point to descriptors in shared memory */
1731         volatile struct vring_tx_desc *_desc = NULL, *_hdr_desc,
1732                                       *_first_desc = NULL;
1733
1734         /* pointers to shadow descriptors */
1735         struct vring_tx_desc desc_mem, hdr_desc_mem, first_desc_mem,
1736                              *d = &hdr_desc_mem, *hdr_desc = &hdr_desc_mem,
1737                              *first_desc = &first_desc_mem;
1738
1739         /* pointer to shadow descriptors' context */
1740         struct wil_ctx *hdr_ctx, *first_ctx = NULL;
1741
1742         int descs_used = 0; /* total number of used descriptors */
1743         int sg_desc_cnt = 0; /* number of descriptors for current mss*/
1744
1745         u32 swhead = vring->swhead;
1746         int used, avail = wil_ring_avail_tx(vring);
1747         int nr_frags = skb_shinfo(skb)->nr_frags;
1748         int min_desc_required = nr_frags + 1;
1749         int mss = skb_shinfo(skb)->gso_size;    /* payload size w/o headers */
1750         int f, len, hdrlen, headlen;
1751         int vring_index = vring - wil->ring_tx;
1752         struct wil_ring_tx_data *txdata = &wil->ring_tx_data[vring_index];
1753         uint i = swhead;
1754         dma_addr_t pa;
1755         const skb_frag_t *frag = NULL;
1756         int rem_data = mss;
1757         int lenmss;
1758         int hdr_compensation_need = true;
1759         int desc_tso_type = wil_tso_type_first;
1760         bool is_ipv4;
1761         int tcp_hdr_len;
1762         int skb_net_hdr_len;
1763         int gso_type;
1764         int rc = -EINVAL;
1765
1766         wil_dbg_txrx(wil, "tx_vring_tso: %d bytes to vring %d\n", skb->len,
1767                      vring_index);
1768
1769         if (unlikely(!txdata->enabled))
1770                 return -EINVAL;
1771
1772         /* A typical page 4K is 3-4 payloads, we assume each fragment
1773          * is a full payload, that's how min_desc_required has been
1774          * calculated. In real we might need more or less descriptors,
1775          * this is the initial check only.
1776          */
1777         if (unlikely(avail < min_desc_required)) {
1778                 wil_err_ratelimited(wil,
1779                                     "TSO: Tx ring[%2d] full. No space for %d fragments\n",
1780                                     vring_index, min_desc_required);
1781                 return -ENOMEM;
1782         }
1783
1784         /* Header Length = MAC header len + IP header len + TCP header len*/
1785         hdrlen = skb_tcp_all_headers(skb);
1786
1787         gso_type = skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV6 | SKB_GSO_TCPV4);
1788         switch (gso_type) {
1789         case SKB_GSO_TCPV4:
1790                 /* TCP v4, zero out the IP length and IPv4 checksum fields
1791                  * as required by the offloading doc
1792                  */
1793                 ip_hdr(skb)->tot_len = 0;
1794                 ip_hdr(skb)->check = 0;
1795                 is_ipv4 = true;
1796                 break;
1797         case SKB_GSO_TCPV6:
1798                 /* TCP v6, zero out the payload length */
1799                 ipv6_hdr(skb)->payload_len = 0;
1800                 is_ipv4 = false;
1801                 break;
1802         default:
1803                 /* other than TCPv4 or TCPv6 types are not supported for TSO.
1804                  * It is also illegal for both to be set simultaneously
1805                  */
1806                 return -EINVAL;
1807         }
1808
1809         if (skb->ip_summed != CHECKSUM_PARTIAL)
1810                 return -EINVAL;
1811
1812         /* tcp header length and skb network header length are fixed for all
1813          * packet's descriptors - read then once here
1814          */
1815         tcp_hdr_len = tcp_hdrlen(skb);
1816         skb_net_hdr_len = skb_network_header_len(skb);
1817
1818         _hdr_desc = &vring->va[i].tx.legacy;
1819
1820         pa = dma_map_single(dev, skb->data, hdrlen, DMA_TO_DEVICE);
1821         if (unlikely(dma_mapping_error(dev, pa))) {
1822                 wil_err(wil, "TSO: Skb head DMA map error\n");
1823                 goto err_exit;
1824         }
1825
1826         wil->txrx_ops.tx_desc_map((union wil_tx_desc *)hdr_desc, pa,
1827                                   hdrlen, vring_index);
1828         wil_tx_desc_offload_setup_tso(hdr_desc, skb, wil_tso_type_hdr, is_ipv4,
1829                                       tcp_hdr_len, skb_net_hdr_len);
1830         wil_tx_last_desc(hdr_desc);
1831
1832         vring->ctx[i].mapped_as = wil_mapped_as_single;
1833         hdr_ctx = &vring->ctx[i];
1834
1835         descs_used++;
1836         headlen = skb_headlen(skb) - hdrlen;
1837
1838         for (f = headlen ? -1 : 0; f < nr_frags; f++)  {
1839                 if (headlen) {
1840                         len = headlen;
1841                         wil_dbg_txrx(wil, "TSO: process skb head, len %u\n",
1842                                      len);
1843                 } else {
1844                         frag = &skb_shinfo(skb)->frags[f];
1845                         len = skb_frag_size(frag);
1846                         wil_dbg_txrx(wil, "TSO: frag[%d]: len %u\n", f, len);
1847                 }
1848
1849                 while (len) {
1850                         wil_dbg_txrx(wil,
1851                                      "TSO: len %d, rem_data %d, descs_used %d\n",
1852                                      len, rem_data, descs_used);
1853
1854                         if (descs_used == avail)  {
1855                                 wil_err_ratelimited(wil, "TSO: ring overflow\n");
1856                                 rc = -ENOMEM;
1857                                 goto mem_error;
1858                         }
1859
1860                         lenmss = min_t(int, rem_data, len);
1861                         i = (swhead + descs_used) % vring->size;
1862                         wil_dbg_txrx(wil, "TSO: lenmss %d, i %d\n", lenmss, i);
1863
1864                         if (!headlen) {
1865                                 pa = skb_frag_dma_map(dev, frag,
1866                                                       skb_frag_size(frag) - len,
1867                                                       lenmss, DMA_TO_DEVICE);
1868                                 vring->ctx[i].mapped_as = wil_mapped_as_page;
1869                         } else {
1870                                 pa = dma_map_single(dev,
1871                                                     skb->data +
1872                                                     skb_headlen(skb) - headlen,
1873                                                     lenmss,
1874                                                     DMA_TO_DEVICE);
1875                                 vring->ctx[i].mapped_as = wil_mapped_as_single;
1876                                 headlen -= lenmss;
1877                         }
1878
1879                         if (unlikely(dma_mapping_error(dev, pa))) {
1880                                 wil_err(wil, "TSO: DMA map page error\n");
1881                                 goto mem_error;
1882                         }
1883
1884                         _desc = &vring->va[i].tx.legacy;
1885
1886                         if (!_first_desc) {
1887                                 _first_desc = _desc;
1888                                 first_ctx = &vring->ctx[i];
1889                                 d = first_desc;
1890                         } else {
1891                                 d = &desc_mem;
1892                         }
1893
1894                         wil->txrx_ops.tx_desc_map((union wil_tx_desc *)d,
1895                                                   pa, lenmss, vring_index);
1896                         wil_tx_desc_offload_setup_tso(d, skb, desc_tso_type,
1897                                                       is_ipv4, tcp_hdr_len,
1898                                                       skb_net_hdr_len);
1899
1900                         /* use tso_type_first only once */
1901                         desc_tso_type = wil_tso_type_mid;
1902
1903                         descs_used++;  /* desc used so far */
1904                         sg_desc_cnt++; /* desc used for this segment */
1905                         len -= lenmss;
1906                         rem_data -= lenmss;
1907
1908                         wil_dbg_txrx(wil,
1909                                      "TSO: len %d, rem_data %d, descs_used %d, sg_desc_cnt %d,\n",
1910                                      len, rem_data, descs_used, sg_desc_cnt);
1911
1912                         /* Close the segment if reached mss size or last frag*/
1913                         if (rem_data == 0 || (f == nr_frags - 1 && len == 0)) {
1914                                 if (hdr_compensation_need) {
1915                                         /* first segment include hdr desc for
1916                                          * release
1917                                          */
1918                                         hdr_ctx->nr_frags = sg_desc_cnt;
1919                                         wil_tx_desc_set_nr_frags(first_desc,
1920                                                                  sg_desc_cnt +
1921                                                                  1);
1922                                         hdr_compensation_need = false;
1923                                 } else {
1924                                         wil_tx_desc_set_nr_frags(first_desc,
1925                                                                  sg_desc_cnt);
1926                                 }
1927                                 first_ctx->nr_frags = sg_desc_cnt - 1;
1928
1929                                 wil_tx_last_desc(d);
1930
1931                                 /* first descriptor may also be the last
1932                                  * for this mss - make sure not to copy
1933                                  * it twice
1934                                  */
1935                                 if (first_desc != d)
1936                                         *_first_desc = *first_desc;
1937
1938                                 /*last descriptor will be copied at the end
1939                                  * of this TS processing
1940                                  */
1941                                 if (f < nr_frags - 1 || len > 0)
1942                                         *_desc = *d;
1943
1944                                 rem_data = mss;
1945                                 _first_desc = NULL;
1946                                 sg_desc_cnt = 0;
1947                         } else if (first_desc != d) /* update mid descriptor */
1948                                         *_desc = *d;
1949                 }
1950         }
1951
1952         if (!_desc)
1953                 goto mem_error;
1954
1955         /* first descriptor may also be the last.
1956          * in this case d pointer is invalid
1957          */
1958         if (_first_desc == _desc)
1959                 d = first_desc;
1960
1961         /* Last data descriptor */
1962         wil_set_tx_desc_last_tso(d);
1963         *_desc = *d;
1964
1965         /* Fill the total number of descriptors in first desc (hdr)*/
1966         wil_tx_desc_set_nr_frags(hdr_desc, descs_used);
1967         *_hdr_desc = *hdr_desc;
1968
1969         /* hold reference to skb
1970          * to prevent skb release before accounting
1971          * in case of immediate "tx done"
1972          */
1973         vring->ctx[i].skb = skb_get(skb);
1974
1975         /* performance monitoring */
1976         used = wil_ring_used_tx(vring);
1977         if (wil_val_in_range(wil->ring_idle_trsh,
1978                              used, used + descs_used)) {
1979                 txdata->idle += get_cycles() - txdata->last_idle;
1980                 wil_dbg_txrx(wil,  "Ring[%2d] not idle %d -> %d\n",
1981                              vring_index, used, used + descs_used);
1982         }
1983
1984         /* Make sure to advance the head only after descriptor update is done.
1985          * This will prevent a race condition where the completion thread
1986          * will see the DU bit set from previous run and will handle the
1987          * skb before it was completed.
1988          */
1989         wmb();
1990
1991         /* advance swhead */
1992         wil_ring_advance_head(vring, descs_used);
1993         wil_dbg_txrx(wil, "TSO: Tx swhead %d -> %d\n", swhead, vring->swhead);
1994
1995         /* make sure all writes to descriptors (shared memory) are done before
1996          * committing them to HW
1997          */
1998         wmb();
1999
2000         if (wil->tx_latency)
2001                 *(ktime_t *)&skb->cb = ktime_get();
2002         else
2003                 memset(skb->cb, 0, sizeof(ktime_t));
2004
2005         wil_w(wil, vring->hwtail, vring->swhead);
2006         return 0;
2007
2008 mem_error:
2009         while (descs_used > 0) {
2010                 struct wil_ctx *ctx;
2011
2012                 i = (swhead + descs_used - 1) % vring->size;
2013                 d = (struct vring_tx_desc *)&vring->va[i].tx.legacy;
2014                 _desc = &vring->va[i].tx.legacy;
2015                 *d = *_desc;
2016                 _desc->dma.status = TX_DMA_STATUS_DU;
2017                 ctx = &vring->ctx[i];
2018                 wil_txdesc_unmap(dev, (union wil_tx_desc *)d, ctx);
2019                 memset(ctx, 0, sizeof(*ctx));
2020                 descs_used--;
2021         }
2022 err_exit:
2023         return rc;
2024 }
2025
2026 static int __wil_tx_ring(struct wil6210_priv *wil, struct wil6210_vif *vif,
2027                          struct wil_ring *ring, struct sk_buff *skb)
2028 {
2029         struct device *dev = wil_to_dev(wil);
2030         struct vring_tx_desc dd, *d = &dd;
2031         volatile struct vring_tx_desc *_d;
2032         u32 swhead = ring->swhead;
2033         int avail = wil_ring_avail_tx(ring);
2034         int nr_frags = skb_shinfo(skb)->nr_frags;
2035         uint f = 0;
2036         int ring_index = ring - wil->ring_tx;
2037         struct wil_ring_tx_data  *txdata = &wil->ring_tx_data[ring_index];
2038         uint i = swhead;
2039         dma_addr_t pa;
2040         int used;
2041         bool mcast = (ring_index == vif->bcast_ring);
2042         uint len = skb_headlen(skb);
2043
2044         wil_dbg_txrx(wil, "tx_ring: %d bytes to ring %d, nr_frags %d\n",
2045                      skb->len, ring_index, nr_frags);
2046
2047         if (unlikely(!txdata->enabled))
2048                 return -EINVAL;
2049
2050         if (unlikely(avail < 1 + nr_frags)) {
2051                 wil_err_ratelimited(wil,
2052                                     "Tx ring[%2d] full. No space for %d fragments\n",
2053                                     ring_index, 1 + nr_frags);
2054                 return -ENOMEM;
2055         }
2056         _d = &ring->va[i].tx.legacy;
2057
2058         pa = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
2059
2060         wil_dbg_txrx(wil, "Tx[%2d] skb %d bytes 0x%p -> %pad\n", ring_index,
2061                      skb_headlen(skb), skb->data, &pa);
2062         wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
2063                           skb->data, skb_headlen(skb), false);
2064
2065         if (unlikely(dma_mapping_error(dev, pa)))
2066                 return -EINVAL;
2067         ring->ctx[i].mapped_as = wil_mapped_as_single;
2068         /* 1-st segment */
2069         wil->txrx_ops.tx_desc_map((union wil_tx_desc *)d, pa, len,
2070                                    ring_index);
2071         if (unlikely(mcast)) {
2072                 d->mac.d[0] |= BIT(MAC_CFG_DESC_TX_0_MCS_EN_POS); /* MCS 0 */
2073                 if (unlikely(len > WIL_BCAST_MCS0_LIMIT)) /* set MCS 1 */
2074                         d->mac.d[0] |= (1 << MAC_CFG_DESC_TX_0_MCS_INDEX_POS);
2075         }
2076         /* Process TCP/UDP checksum offloading */
2077         if (unlikely(wil_tx_desc_offload_setup(d, skb))) {
2078                 wil_err(wil, "Tx[%2d] Failed to set cksum, drop packet\n",
2079                         ring_index);
2080                 goto dma_error;
2081         }
2082
2083         ring->ctx[i].nr_frags = nr_frags;
2084         wil_tx_desc_set_nr_frags(d, nr_frags + 1);
2085
2086         /* middle segments */
2087         for (; f < nr_frags; f++) {
2088                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
2089                 int len = skb_frag_size(frag);
2090
2091                 *_d = *d;
2092                 wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", ring_index, i);
2093                 wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4,
2094                                   (const void *)d, sizeof(*d), false);
2095                 i = (swhead + f + 1) % ring->size;
2096                 _d = &ring->va[i].tx.legacy;
2097                 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
2098                                       DMA_TO_DEVICE);
2099                 if (unlikely(dma_mapping_error(dev, pa))) {
2100                         wil_err(wil, "Tx[%2d] failed to map fragment\n",
2101                                 ring_index);
2102                         goto dma_error;
2103                 }
2104                 ring->ctx[i].mapped_as = wil_mapped_as_page;
2105                 wil->txrx_ops.tx_desc_map((union wil_tx_desc *)d,
2106                                            pa, len, ring_index);
2107                 /* no need to check return code -
2108                  * if it succeeded for 1-st descriptor,
2109                  * it will succeed here too
2110                  */
2111                 wil_tx_desc_offload_setup(d, skb);
2112         }
2113         /* for the last seg only */
2114         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
2115         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
2116         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
2117         *_d = *d;
2118         wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", ring_index, i);
2119         wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4,
2120                           (const void *)d, sizeof(*d), false);
2121
2122         /* hold reference to skb
2123          * to prevent skb release before accounting
2124          * in case of immediate "tx done"
2125          */
2126         ring->ctx[i].skb = skb_get(skb);
2127
2128         /* performance monitoring */
2129         used = wil_ring_used_tx(ring);
2130         if (wil_val_in_range(wil->ring_idle_trsh,
2131                              used, used + nr_frags + 1)) {
2132                 txdata->idle += get_cycles() - txdata->last_idle;
2133                 wil_dbg_txrx(wil,  "Ring[%2d] not idle %d -> %d\n",
2134                              ring_index, used, used + nr_frags + 1);
2135         }
2136
2137         /* Make sure to advance the head only after descriptor update is done.
2138          * This will prevent a race condition where the completion thread
2139          * will see the DU bit set from previous run and will handle the
2140          * skb before it was completed.
2141          */
2142         wmb();
2143
2144         /* advance swhead */
2145         wil_ring_advance_head(ring, nr_frags + 1);
2146         wil_dbg_txrx(wil, "Tx[%2d] swhead %d -> %d\n", ring_index, swhead,
2147                      ring->swhead);
2148         trace_wil6210_tx(ring_index, swhead, skb->len, nr_frags);
2149
2150         /* make sure all writes to descriptors (shared memory) are done before
2151          * committing them to HW
2152          */
2153         wmb();
2154
2155         if (wil->tx_latency)
2156                 *(ktime_t *)&skb->cb = ktime_get();
2157         else
2158                 memset(skb->cb, 0, sizeof(ktime_t));
2159
2160         wil_w(wil, ring->hwtail, ring->swhead);
2161
2162         return 0;
2163  dma_error:
2164         /* unmap what we have mapped */
2165         nr_frags = f + 1; /* frags mapped + one for skb head */
2166         for (f = 0; f < nr_frags; f++) {
2167                 struct wil_ctx *ctx;
2168
2169                 i = (swhead + f) % ring->size;
2170                 ctx = &ring->ctx[i];
2171                 _d = &ring->va[i].tx.legacy;
2172                 *d = *_d;
2173                 _d->dma.status = TX_DMA_STATUS_DU;
2174                 wil->txrx_ops.tx_desc_unmap(dev,
2175                                             (union wil_tx_desc *)d,
2176                                             ctx);
2177
2178                 memset(ctx, 0, sizeof(*ctx));
2179         }
2180
2181         return -EINVAL;
2182 }
2183
2184 static int wil_tx_ring(struct wil6210_priv *wil, struct wil6210_vif *vif,
2185                        struct wil_ring *ring, struct sk_buff *skb)
2186 {
2187         int ring_index = ring - wil->ring_tx;
2188         struct wil_ring_tx_data *txdata = &wil->ring_tx_data[ring_index];
2189         int rc;
2190
2191         spin_lock(&txdata->lock);
2192
2193         if (test_bit(wil_status_suspending, wil->status) ||
2194             test_bit(wil_status_suspended, wil->status) ||
2195             test_bit(wil_status_resuming, wil->status)) {
2196                 wil_dbg_txrx(wil,
2197                              "suspend/resume in progress. drop packet\n");
2198                 spin_unlock(&txdata->lock);
2199                 return -EINVAL;
2200         }
2201
2202         rc = (skb_is_gso(skb) ? wil->txrx_ops.tx_ring_tso : __wil_tx_ring)
2203              (wil, vif, ring, skb);
2204
2205         spin_unlock(&txdata->lock);
2206
2207         return rc;
2208 }
2209
2210 /* Check status of tx vrings and stop/wake net queues if needed
2211  * It will start/stop net queues of a specific VIF net_device.
2212  *
2213  * This function does one of two checks:
2214  * In case check_stop is true, will check if net queues need to be stopped. If
2215  * the conditions for stopping are met, netif_tx_stop_all_queues() is called.
2216  * In case check_stop is false, will check if net queues need to be waked. If
2217  * the conditions for waking are met, netif_tx_wake_all_queues() is called.
2218  * vring is the vring which is currently being modified by either adding
2219  * descriptors (tx) into it or removing descriptors (tx complete) from it. Can
2220  * be null when irrelevant (e.g. connect/disconnect events).
2221  *
2222  * The implementation is to stop net queues if modified vring has low
2223  * descriptor availability. Wake if all vrings are not in low descriptor
2224  * availability and modified vring has high descriptor availability.
2225  */
2226 static inline void __wil_update_net_queues(struct wil6210_priv *wil,
2227                                            struct wil6210_vif *vif,
2228                                            struct wil_ring *ring,
2229                                            bool check_stop)
2230 {
2231         int i;
2232         int min_ring_id = wil_get_min_tx_ring_id(wil);
2233
2234         if (unlikely(!vif))
2235                 return;
2236
2237         if (ring)
2238                 wil_dbg_txrx(wil, "vring %d, mid %d, check_stop=%d, stopped=%d",
2239                              (int)(ring - wil->ring_tx), vif->mid, check_stop,
2240                              vif->net_queue_stopped);
2241         else
2242                 wil_dbg_txrx(wil, "check_stop=%d, mid=%d, stopped=%d",
2243                              check_stop, vif->mid, vif->net_queue_stopped);
2244
2245         if (ring && drop_if_ring_full)
2246                 /* no need to stop/wake net queues */
2247                 return;
2248
2249         if (check_stop == vif->net_queue_stopped)
2250                 /* net queues already in desired state */
2251                 return;
2252
2253         if (check_stop) {
2254                 if (!ring || unlikely(wil_ring_avail_low(ring))) {
2255                         /* not enough room in the vring */
2256                         netif_tx_stop_all_queues(vif_to_ndev(vif));
2257                         vif->net_queue_stopped = true;
2258                         wil_dbg_txrx(wil, "netif_tx_stop called\n");
2259                 }
2260                 return;
2261         }
2262
2263         /* Do not wake the queues in suspend flow */
2264         if (test_bit(wil_status_suspending, wil->status) ||
2265             test_bit(wil_status_suspended, wil->status))
2266                 return;
2267
2268         /* check wake */
2269         for (i = min_ring_id; i < WIL6210_MAX_TX_RINGS; i++) {
2270                 struct wil_ring *cur_ring = &wil->ring_tx[i];
2271                 struct wil_ring_tx_data  *txdata = &wil->ring_tx_data[i];
2272
2273                 if (txdata->mid != vif->mid || !cur_ring->va ||
2274                     !txdata->enabled || cur_ring == ring)
2275                         continue;
2276
2277                 if (wil_ring_avail_low(cur_ring)) {
2278                         wil_dbg_txrx(wil, "ring %d full, can't wake\n",
2279                                      (int)(cur_ring - wil->ring_tx));
2280                         return;
2281                 }
2282         }
2283
2284         if (!ring || wil_ring_avail_high(ring)) {
2285                 /* enough room in the ring */
2286                 wil_dbg_txrx(wil, "calling netif_tx_wake\n");
2287                 netif_tx_wake_all_queues(vif_to_ndev(vif));
2288                 vif->net_queue_stopped = false;
2289         }
2290 }
2291
2292 void wil_update_net_queues(struct wil6210_priv *wil, struct wil6210_vif *vif,
2293                            struct wil_ring *ring, bool check_stop)
2294 {
2295         spin_lock(&wil->net_queue_lock);
2296         __wil_update_net_queues(wil, vif, ring, check_stop);
2297         spin_unlock(&wil->net_queue_lock);
2298 }
2299
2300 void wil_update_net_queues_bh(struct wil6210_priv *wil, struct wil6210_vif *vif,
2301                               struct wil_ring *ring, bool check_stop)
2302 {
2303         spin_lock_bh(&wil->net_queue_lock);
2304         __wil_update_net_queues(wil, vif, ring, check_stop);
2305         spin_unlock_bh(&wil->net_queue_lock);
2306 }
2307
2308 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
2309 {
2310         struct wil6210_vif *vif = ndev_to_vif(ndev);
2311         struct wil6210_priv *wil = vif_to_wil(vif);
2312         const u8 *da = wil_skb_get_da(skb);
2313         bool bcast = is_multicast_ether_addr(da);
2314         struct wil_ring *ring;
2315         static bool pr_once_fw;
2316         int rc;
2317
2318         wil_dbg_txrx(wil, "start_xmit\n");
2319         if (unlikely(!test_bit(wil_status_fwready, wil->status))) {
2320                 if (!pr_once_fw) {
2321                         wil_err(wil, "FW not ready\n");
2322                         pr_once_fw = true;
2323                 }
2324                 goto drop;
2325         }
2326         if (unlikely(!test_bit(wil_vif_fwconnected, vif->status))) {
2327                 wil_dbg_ratelimited(wil,
2328                                     "VIF not connected, packet dropped\n");
2329                 goto drop;
2330         }
2331         if (unlikely(vif->wdev.iftype == NL80211_IFTYPE_MONITOR)) {
2332                 wil_err(wil, "Xmit in monitor mode not supported\n");
2333                 goto drop;
2334         }
2335         pr_once_fw = false;
2336
2337         /* find vring */
2338         if (vif->wdev.iftype == NL80211_IFTYPE_STATION && !vif->pbss) {
2339                 /* in STA mode (ESS), all to same VRING (to AP) */
2340                 ring = wil_find_tx_ring_sta(wil, vif, skb);
2341         } else if (bcast) {
2342                 if (vif->pbss || wil_check_multicast_to_unicast(wil, skb))
2343                         /* in pbss, no bcast VRING - duplicate skb in
2344                          * all stations VRINGs
2345                          */
2346                         ring = wil_find_tx_bcast_2(wil, vif, skb);
2347                 else if (vif->wdev.iftype == NL80211_IFTYPE_AP)
2348                         /* AP has a dedicated bcast VRING */
2349                         ring = wil_find_tx_bcast_1(wil, vif, skb);
2350                 else
2351                         /* unexpected combination, fallback to duplicating
2352                          * the skb in all stations VRINGs
2353                          */
2354                         ring = wil_find_tx_bcast_2(wil, vif, skb);
2355         } else {
2356                 /* unicast, find specific VRING by dest. address */
2357                 ring = wil_find_tx_ucast(wil, vif, skb);
2358         }
2359         if (unlikely(!ring)) {
2360                 wil_dbg_txrx(wil, "No Tx RING found for %pM\n", da);
2361                 goto drop;
2362         }
2363         /* set up vring entry */
2364         rc = wil_tx_ring(wil, vif, ring, skb);
2365
2366         switch (rc) {
2367         case 0:
2368                 /* shall we stop net queues? */
2369                 wil_update_net_queues_bh(wil, vif, ring, true);
2370                 /* statistics will be updated on the tx_complete */
2371                 dev_kfree_skb_any(skb);
2372                 return NETDEV_TX_OK;
2373         case -ENOMEM:
2374                 if (drop_if_ring_full)
2375                         goto drop;
2376                 return NETDEV_TX_BUSY;
2377         default:
2378                 break; /* goto drop; */
2379         }
2380  drop:
2381         ndev->stats.tx_dropped++;
2382         dev_kfree_skb_any(skb);
2383
2384         return NET_XMIT_DROP;
2385 }
2386
2387 void wil_tx_latency_calc(struct wil6210_priv *wil, struct sk_buff *skb,
2388                          struct wil_sta_info *sta)
2389 {
2390         int skb_time_us;
2391         int bin;
2392
2393         if (!wil->tx_latency)
2394                 return;
2395
2396         if (ktime_to_ms(*(ktime_t *)&skb->cb) == 0)
2397                 return;
2398
2399         skb_time_us = ktime_us_delta(ktime_get(), *(ktime_t *)&skb->cb);
2400         bin = skb_time_us / wil->tx_latency_res;
2401         bin = min_t(int, bin, WIL_NUM_LATENCY_BINS - 1);
2402
2403         wil_dbg_txrx(wil, "skb time %dus => bin %d\n", skb_time_us, bin);
2404         sta->tx_latency_bins[bin]++;
2405         sta->stats.tx_latency_total_us += skb_time_us;
2406         if (skb_time_us < sta->stats.tx_latency_min_us)
2407                 sta->stats.tx_latency_min_us = skb_time_us;
2408         if (skb_time_us > sta->stats.tx_latency_max_us)
2409                 sta->stats.tx_latency_max_us = skb_time_us;
2410 }
2411
2412 /* Clean up transmitted skb's from the Tx VRING
2413  *
2414  * Return number of descriptors cleared
2415  *
2416  * Safe to call from IRQ
2417  */
2418 int wil_tx_complete(struct wil6210_vif *vif, int ringid)
2419 {
2420         struct wil6210_priv *wil = vif_to_wil(vif);
2421         struct net_device *ndev = vif_to_ndev(vif);
2422         struct device *dev = wil_to_dev(wil);
2423         struct wil_ring *vring = &wil->ring_tx[ringid];
2424         struct wil_ring_tx_data *txdata = &wil->ring_tx_data[ringid];
2425         int done = 0;
2426         int cid = wil->ring2cid_tid[ringid][0];
2427         struct wil_net_stats *stats = NULL;
2428         volatile struct vring_tx_desc *_d;
2429         int used_before_complete;
2430         int used_new;
2431
2432         if (unlikely(!vring->va)) {
2433                 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
2434                 return 0;
2435         }
2436
2437         if (unlikely(!txdata->enabled)) {
2438                 wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid);
2439                 return 0;
2440         }
2441
2442         wil_dbg_txrx(wil, "tx_complete: (%d)\n", ringid);
2443
2444         used_before_complete = wil_ring_used_tx(vring);
2445
2446         if (cid < wil->max_assoc_sta)
2447                 stats = &wil->sta[cid].stats;
2448
2449         while (!wil_ring_is_empty(vring)) {
2450                 int new_swtail;
2451                 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
2452                 /* For the fragmented skb, HW will set DU bit only for the
2453                  * last fragment. look for it.
2454                  * In TSO the first DU will include hdr desc
2455                  */
2456                 int lf = (vring->swtail + ctx->nr_frags) % vring->size;
2457                 /* TODO: check we are not past head */
2458
2459                 _d = &vring->va[lf].tx.legacy;
2460                 if (unlikely(!(_d->dma.status & TX_DMA_STATUS_DU)))
2461                         break;
2462
2463                 new_swtail = (lf + 1) % vring->size;
2464                 while (vring->swtail != new_swtail) {
2465                         struct vring_tx_desc dd, *d = &dd;
2466                         u16 dmalen;
2467                         struct sk_buff *skb;
2468
2469                         ctx = &vring->ctx[vring->swtail];
2470                         skb = ctx->skb;
2471                         _d = &vring->va[vring->swtail].tx.legacy;
2472
2473                         *d = *_d;
2474
2475                         dmalen = le16_to_cpu(d->dma.length);
2476                         trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
2477                                               d->dma.error);
2478                         wil_dbg_txrx(wil,
2479                                      "TxC[%2d][%3d] : %d bytes, status 0x%02x err 0x%02x\n",
2480                                      ringid, vring->swtail, dmalen,
2481                                      d->dma.status, d->dma.error);
2482                         wil_hex_dump_txrx("TxCD ", DUMP_PREFIX_NONE, 32, 4,
2483                                           (const void *)d, sizeof(*d), false);
2484
2485                         wil->txrx_ops.tx_desc_unmap(dev,
2486                                                     (union wil_tx_desc *)d,
2487                                                     ctx);
2488
2489                         if (skb) {
2490                                 if (likely(d->dma.error == 0)) {
2491                                         ndev->stats.tx_packets++;
2492                                         ndev->stats.tx_bytes += skb->len;
2493                                         if (stats) {
2494                                                 stats->tx_packets++;
2495                                                 stats->tx_bytes += skb->len;
2496
2497                                                 wil_tx_latency_calc(wil, skb,
2498                                                         &wil->sta[cid]);
2499                                         }
2500                                 } else {
2501                                         ndev->stats.tx_errors++;
2502                                         if (stats)
2503                                                 stats->tx_errors++;
2504                                 }
2505
2506                                 if (skb->protocol == cpu_to_be16(ETH_P_PAE))
2507                                         wil_tx_complete_handle_eapol(vif, skb);
2508
2509                                 wil_consume_skb(skb, d->dma.error == 0);
2510                         }
2511                         memset(ctx, 0, sizeof(*ctx));
2512                         /* Make sure the ctx is zeroed before updating the tail
2513                          * to prevent a case where wil_tx_ring will see
2514                          * this descriptor as used and handle it before ctx zero
2515                          * is completed.
2516                          */
2517                         wmb();
2518                         /* There is no need to touch HW descriptor:
2519                          * - ststus bit TX_DMA_STATUS_DU is set by design,
2520                          *   so hardware will not try to process this desc.,
2521                          * - rest of descriptor will be initialized on Tx.
2522                          */
2523                         vring->swtail = wil_ring_next_tail(vring);
2524                         done++;
2525                 }
2526         }
2527
2528         /* performance monitoring */
2529         used_new = wil_ring_used_tx(vring);
2530         if (wil_val_in_range(wil->ring_idle_trsh,
2531                              used_new, used_before_complete)) {
2532                 wil_dbg_txrx(wil, "Ring[%2d] idle %d -> %d\n",
2533                              ringid, used_before_complete, used_new);
2534                 txdata->last_idle = get_cycles();
2535         }
2536
2537         /* shall we wake net queues? */
2538         if (done)
2539                 wil_update_net_queues(wil, vif, vring, false);
2540
2541         return done;
2542 }
2543
2544 static inline int wil_tx_init(struct wil6210_priv *wil)
2545 {
2546         return 0;
2547 }
2548
2549 static inline void wil_tx_fini(struct wil6210_priv *wil) {}
2550
2551 static void wil_get_reorder_params(struct wil6210_priv *wil,
2552                                    struct sk_buff *skb, int *tid, int *cid,
2553                                    int *mid, u16 *seq, int *mcast, int *retry)
2554 {
2555         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
2556
2557         *tid = wil_rxdesc_tid(d);
2558         *cid = wil_skb_get_cid(skb);
2559         *mid = wil_rxdesc_mid(d);
2560         *seq = wil_rxdesc_seq(d);
2561         *mcast = wil_rxdesc_mcast(d);
2562         *retry = wil_rxdesc_retry(d);
2563 }
2564
2565 void wil_init_txrx_ops_legacy_dma(struct wil6210_priv *wil)
2566 {
2567         wil->txrx_ops.configure_interrupt_moderation =
2568                 wil_configure_interrupt_moderation;
2569         /* TX ops */
2570         wil->txrx_ops.tx_desc_map = wil_tx_desc_map;
2571         wil->txrx_ops.tx_desc_unmap = wil_txdesc_unmap;
2572         wil->txrx_ops.tx_ring_tso =  __wil_tx_vring_tso;
2573         wil->txrx_ops.ring_init_tx = wil_vring_init_tx;
2574         wil->txrx_ops.ring_fini_tx = wil_vring_free;
2575         wil->txrx_ops.ring_init_bcast = wil_vring_init_bcast;
2576         wil->txrx_ops.tx_init = wil_tx_init;
2577         wil->txrx_ops.tx_fini = wil_tx_fini;
2578         wil->txrx_ops.tx_ring_modify = wil_tx_vring_modify;
2579         /* RX ops */
2580         wil->txrx_ops.rx_init = wil_rx_init;
2581         wil->txrx_ops.wmi_addba_rx_resp = wmi_addba_rx_resp;
2582         wil->txrx_ops.get_reorder_params = wil_get_reorder_params;
2583         wil->txrx_ops.get_netif_rx_params =
2584                 wil_get_netif_rx_params;
2585         wil->txrx_ops.rx_crypto_check = wil_rx_crypto_check;
2586         wil->txrx_ops.rx_error_check = wil_rx_error_check;
2587         wil->txrx_ops.is_rx_idle = wil_is_rx_idle;
2588         wil->txrx_ops.rx_fini = wil_rx_fini;
2589 }