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

   1 /*
   2  * Copyright (c) 2012-2015 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/etherdevice.h>
  18 #include <net/ieee80211_radiotap.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/ip.h>
  22 #include <linux/ipv6.h>
  23 #include <net/ipv6.h>
  24 #include <linux/prefetch.h>
  25
  26 #include "wil6210.h"
  27 #include "wmi.h"
  28 #include "txrx.h"
  29 #include "trace.h"
  30
  31 static bool rtap_include_phy_info;
  32 module_param(rtap_include_phy_info, bool, S_IRUGO);
  33 MODULE_PARM_DESC(rtap_include_phy_info,
  34                  " Include PHY info in the radiotap header, default - no");
  35
  36 bool rx_align_2;
  37 module_param(rx_align_2, bool, S_IRUGO);
  38 MODULE_PARM_DESC(rx_align_2, " align Rx buffers on 4*n+2, default - no");
  39
  40 static inline uint wil_rx_snaplen(void)
  41 {
  42         return rx_align_2 ? 6 : 0;
  43 }
  44
  45 static inline int wil_vring_is_empty(struct vring *vring)
  46 {
  47         return vring->swhead == vring->swtail;
  48 }
  49
  50 static inline u32 wil_vring_next_tail(struct vring *vring)
  51 {
  52         return (vring->swtail + 1) % vring->size;
  53 }
  54
  55 static inline void wil_vring_advance_head(struct vring *vring, int n)
  56 {
  57         vring->swhead = (vring->swhead + n) % vring->size;
  58 }
  59
  60 static inline int wil_vring_is_full(struct vring *vring)
  61 {
  62         return wil_vring_next_tail(vring) == vring->swhead;
  63 }
  64
  65 /* Used space in Tx Vring */
  66 static inline int wil_vring_used_tx(struct vring *vring)
  67 {
  68         u32 swhead = vring->swhead;
  69         u32 swtail = vring->swtail;
  70         return (vring->size + swhead - swtail) % vring->size;
  71 }
  72
  73 /* Available space in Tx Vring */
  74 static inline int wil_vring_avail_tx(struct vring *vring)
  75 {
  76         return vring->size - wil_vring_used_tx(vring) - 1;
  77 }
  78
  79 /* wil_vring_wmark_low - low watermark for available descriptor space */
  80 static inline int wil_vring_wmark_low(struct vring *vring)
  81 {
  82         return vring->size/8;
  83 }
  84
  85 /* wil_vring_wmark_high - high watermark for available descriptor space */
  86 static inline int wil_vring_wmark_high(struct vring *vring)
  87 {
  88         return vring->size/4;
  89 }
  90
  91 /* wil_val_in_range - check if value in [min,max) */
  92 static inline bool wil_val_in_range(int val, int min, int max)
  93 {
  94         return val >= min && val < max;
  95 }
  96
  97 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
  98 {
  99         struct device *dev = wil_to_dev(wil);
 100         size_t sz = vring->size * sizeof(vring->va[0]);
 101         uint i;
 102
 103         wil_dbg_misc(wil, "%s()\n", __func__);
 104
 105         BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
 106
 107         vring->swhead = 0;
 108         vring->swtail = 0;
 109         vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
 110         if (!vring->ctx) {
 111                 vring->va = NULL;
 112                 return -ENOMEM;
 113         }
 114         /* vring->va should be aligned on its size rounded up to power of 2
 115          * This is granted by the dma_alloc_coherent
 116          */
 117         vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
 118         if (!vring->va) {
 119                 kfree(vring->ctx);
 120                 vring->ctx = NULL;
 121                 return -ENOMEM;
 122         }
 123         /* initially, all descriptors are SW owned
 124          * For Tx and Rx, ownership bit is at the same location, thus
 125          * we can use any
 126          */
 127         for (i = 0; i < vring->size; i++) {
 128                 volatile struct vring_tx_desc *_d = &vring->va[i].tx;
 129
 130                 _d->dma.status = TX_DMA_STATUS_DU;
 131         }
 132
 133         wil_dbg_misc(wil, "vring[%d] 0x%p:%pad 0x%p\n", vring->size,
 134                      vring->va, &vring->pa, vring->ctx);
 135
 136         return 0;
 137 }
 138
 139 static void wil_txdesc_unmap(struct device *dev, struct vring_tx_desc *d,
 140                              struct wil_ctx *ctx)
 141 {
 142         dma_addr_t pa = wil_desc_addr(&d->dma.addr);
 143         u16 dmalen = le16_to_cpu(d->dma.length);
 144
 145         switch (ctx->mapped_as) {
 146         case wil_mapped_as_single:
 147                 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
 148                 break;
 149         case wil_mapped_as_page:
 150                 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
 151                 break;
 152         default:
 153                 break;
 154         }
 155 }
 156
 157 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
 158                            int tx)
 159 {
 160         struct device *dev = wil_to_dev(wil);
 161         size_t sz = vring->size * sizeof(vring->va[0]);
 162
 163         if (tx) {
 164                 int vring_index = vring - wil->vring_tx;
 165
 166                 wil_dbg_misc(wil, "free Tx vring %d [%d] 0x%p:%pad 0x%p\n",
 167                              vring_index, vring->size, vring->va,
 168                              &vring->pa, vring->ctx);
 169         } else {
 170                 wil_dbg_misc(wil, "free Rx vring [%d] 0x%p:%pad 0x%p\n",
 171                              vring->size, vring->va,
 172                              &vring->pa, vring->ctx);
 173         }
 174
 175         while (!wil_vring_is_empty(vring)) {
 176                 dma_addr_t pa;
 177                 u16 dmalen;
 178                 struct wil_ctx *ctx;
 179
 180                 if (tx) {
 181                         struct vring_tx_desc dd, *d = &dd;
 182                         volatile struct vring_tx_desc *_d =
 183                                         &vring->va[vring->swtail].tx;
 184
 185                         ctx = &vring->ctx[vring->swtail];
 186                         *d = *_d;
 187                         wil_txdesc_unmap(dev, d, ctx);
 188                         if (ctx->skb)
 189                                 dev_kfree_skb_any(ctx->skb);
 190                         vring->swtail = wil_vring_next_tail(vring);
 191                 } else { /* rx */
 192                         struct vring_rx_desc dd, *d = &dd;
 193                         volatile struct vring_rx_desc *_d =
 194                                         &vring->va[vring->swhead].rx;
 195
 196                         ctx = &vring->ctx[vring->swhead];
 197                         *d = *_d;
 198                         pa = wil_desc_addr(&d->dma.addr);
 199                         dmalen = le16_to_cpu(d->dma.length);
 200                         dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
 201                         kfree_skb(ctx->skb);
 202                         wil_vring_advance_head(vring, 1);
 203                 }
 204         }
 205         dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
 206         kfree(vring->ctx);
 207         vring->pa = 0;
 208         vring->va = NULL;
 209         vring->ctx = NULL;
 210 }
 211
 212 /**
 213  * Allocate one skb for Rx VRING
 214  *
 215  * Safe to call from IRQ
 216  */
 217 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
 218                                u32 i, int headroom)
 219 {
 220         struct device *dev = wil_to_dev(wil);
 221         unsigned int sz = mtu_max + ETH_HLEN + wil_rx_snaplen();
 222         struct vring_rx_desc dd, *d = &dd;
 223         volatile struct vring_rx_desc *_d = &vring->va[i].rx;
 224         dma_addr_t pa;
 225         struct sk_buff *skb = dev_alloc_skb(sz + headroom);
 226
 227         if (unlikely(!skb))
 228                 return -ENOMEM;
 229
 230         skb_reserve(skb, headroom);
 231         skb_put(skb, sz);
 232
 233         pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
 234         if (unlikely(dma_mapping_error(dev, pa))) {
 235                 kfree_skb(skb);
 236                 return -ENOMEM;
 237         }
 238
 239         d->dma.d0 = RX_DMA_D0_CMD_DMA_RT | RX_DMA_D0_CMD_DMA_IT;
 240         wil_desc_addr_set(&d->dma.addr, pa);
 241         /* ip_length don't care */
 242         /* b11 don't care */
 243         /* error don't care */
 244         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
 245         d->dma.length = cpu_to_le16(sz);
 246         *_d = *d;
 247         vring->ctx[i].skb = skb;
 248
 249         return 0;
 250 }
 251
 252 /**
 253  * Adds radiotap header
 254  *
 255  * Any error indicated as "Bad FCS"
 256  *
 257  * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
 258  *  - Rx descriptor: 32 bytes
 259  *  - Phy info
 260  */
 261 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
 262                                        struct sk_buff *skb)
 263 {
 264         struct wireless_dev *wdev = wil->wdev;
 265         struct wil6210_rtap {
 266                 struct ieee80211_radiotap_header rthdr;
 267                 /* fields should be in the order of bits in rthdr.it_present */
 268                 /* flags */
 269                 u8 flags;
 270                 /* channel */
 271                 __le16 chnl_freq __aligned(2);
 272                 __le16 chnl_flags;
 273                 /* MCS */
 274                 u8 mcs_present;
 275                 u8 mcs_flags;
 276                 u8 mcs_index;
 277         } __packed;
 278         struct wil6210_rtap_vendor {
 279                 struct wil6210_rtap rtap;
 280                 /* vendor */
 281                 u8 vendor_oui[3] __aligned(2);
 282                 u8 vendor_ns;
 283                 __le16 vendor_skip;
 284                 u8 vendor_data[0];
 285         } __packed;
 286         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 287         struct wil6210_rtap_vendor *rtap_vendor;
 288         int rtap_len = sizeof(struct wil6210_rtap);
 289         int phy_length = 0; /* phy info header size, bytes */
 290         static char phy_data[128];
 291         struct ieee80211_channel *ch = wdev->preset_chandef.chan;
 292
 293         if (rtap_include_phy_info) {
 294                 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
 295                 /* calculate additional length */
 296                 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
 297                         /**
 298                          * PHY info starts from 8-byte boundary
 299                          * there are 8-byte lines, last line may be partially
 300                          * written (HW bug), thus FW configures for last line
 301                          * to be excessive. Driver skips this last line.
 302                          */
 303                         int len = min_t(int, 8 + sizeof(phy_data),
 304                                         wil_rxdesc_phy_length(d));
 305
 306                         if (len > 8) {
 307                                 void *p = skb_tail_pointer(skb);
 308                                 void *pa = PTR_ALIGN(p, 8);
 309
 310                                 if (skb_tailroom(skb) >= len + (pa - p)) {
 311                                         phy_length = len - 8;
 312                                         memcpy(phy_data, pa, phy_length);
 313                                 }
 314                         }
 315                 }
 316                 rtap_len += phy_length;
 317         }
 318
 319         if (skb_headroom(skb) < rtap_len &&
 320             pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
 321                 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
 322                 return;
 323         }
 324
 325         rtap_vendor = (void *)skb_push(skb, rtap_len);
 326         memset(rtap_vendor, 0, rtap_len);
 327
 328         rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
 329         rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
 330         rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
 331                         (1 << IEEE80211_RADIOTAP_FLAGS) |
 332                         (1 << IEEE80211_RADIOTAP_CHANNEL) |
 333                         (1 << IEEE80211_RADIOTAP_MCS));
 334         if (d->dma.status & RX_DMA_STATUS_ERROR)
 335                 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
 336
 337         rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
 338         rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
 339
 340         rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
 341         rtap_vendor->rtap.mcs_flags = 0;
 342         rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
 343
 344         if (rtap_include_phy_info) {
 345                 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
 346                                 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
 347                 /* OUI for Wilocity 04:ce:14 */
 348                 rtap_vendor->vendor_oui[0] = 0x04;
 349                 rtap_vendor->vendor_oui[1] = 0xce;
 350                 rtap_vendor->vendor_oui[2] = 0x14;
 351                 rtap_vendor->vendor_ns = 1;
 352                 /* Rx descriptor + PHY data  */
 353                 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
 354                                                        phy_length);
 355                 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
 356                 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
 357                        phy_length);
 358         }
 359 }
 360
 361 /* similar to ieee80211_ version, but FC contain only 1-st byte */
 362 static inline int wil_is_back_req(u8 fc)
 363 {
 364         return (fc & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) ==
 365                (IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK_REQ);
 366 }
 367
 368 /**
 369  * reap 1 frame from @swhead
 370  *
 371  * Rx descriptor copied to skb->cb
 372  *
 373  * Safe to call from IRQ
 374  */
 375 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
 376                                          struct vring *vring)
 377 {
 378         struct device *dev = wil_to_dev(wil);
 379         struct net_device *ndev = wil_to_ndev(wil);
 380         volatile struct vring_rx_desc *_d;
 381         struct vring_rx_desc *d;
 382         struct sk_buff *skb;
 383         dma_addr_t pa;
 384         unsigned int snaplen = wil_rx_snaplen();
 385         unsigned int sz = mtu_max + ETH_HLEN + snaplen;
 386         u16 dmalen;
 387         u8 ftype;
 388         int cid;
 389         int i;
 390         struct wil_net_stats *stats;
 391
 392         BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
 393
 394 again:
 395         if (unlikely(wil_vring_is_empty(vring)))
 396                 return NULL;
 397
 398         i = (int)vring->swhead;
 399         _d = &vring->va[i].rx;
 400         if (unlikely(!(_d->dma.status & RX_DMA_STATUS_DU))) {
 401                 /* it is not error, we just reached end of Rx done area */
 402                 return NULL;
 403         }
 404
 405         skb = vring->ctx[i].skb;
 406         vring->ctx[i].skb = NULL;
 407         wil_vring_advance_head(vring, 1);
 408         if (!skb) {
 409                 wil_err(wil, "No Rx skb at [%d]\n", i);
 410                 goto again;
 411         }
 412         d = wil_skb_rxdesc(skb);
 413         *d = *_d;
 414         pa = wil_desc_addr(&d->dma.addr);
 415
 416         dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
 417         dmalen = le16_to_cpu(d->dma.length);
 418
 419         trace_wil6210_rx(i, d);
 420         wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", i, dmalen);
 421         wil_hex_dump_txrx("RxD ", DUMP_PREFIX_NONE, 32, 4,
 422                           (const void *)d, sizeof(*d), false);
 423
 424         cid = wil_rxdesc_cid(d);
 425         stats = &wil->sta[cid].stats;
 426
 427         if (unlikely(dmalen > sz)) {
 428                 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
 429                 stats->rx_large_frame++;
 430                 kfree_skb(skb);
 431                 goto again;
 432         }
 433         skb_trim(skb, dmalen);
 434
 435         prefetch(skb->data);
 436
 437         wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
 438                           skb->data, skb_headlen(skb), false);
 439
 440         stats->last_mcs_rx = wil_rxdesc_mcs(d);
 441         if (stats->last_mcs_rx < ARRAY_SIZE(stats->rx_per_mcs))
 442                 stats->rx_per_mcs[stats->last_mcs_rx]++;
 443
 444         /* use radiotap header only if required */
 445         if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
 446                 wil_rx_add_radiotap_header(wil, skb);
 447
 448         /* no extra checks if in sniffer mode */
 449         if (ndev->type != ARPHRD_ETHER)
 450                 return skb;
 451         /* Non-data frames may be delivered through Rx DMA channel (ex: BAR)
 452          * Driver should recognize it by frame type, that is found
 453          * in Rx descriptor. If type is not data, it is 802.11 frame as is
 454          */
 455         ftype = wil_rxdesc_ftype(d) << 2;
 456         if (unlikely(ftype != IEEE80211_FTYPE_DATA)) {
 457                 u8 fc1 = wil_rxdesc_fc1(d);
 458                 int mid = wil_rxdesc_mid(d);
 459                 int tid = wil_rxdesc_tid(d);
 460                 u16 seq = wil_rxdesc_seq(d);
 461
 462                 wil_dbg_txrx(wil,
 463                              "Non-data frame FC[7:0] 0x%02x MID %d CID %d TID %d Seq 0x%03x\n",
 464                              fc1, mid, cid, tid, seq);
 465                 stats->rx_non_data_frame++;
 466                 if (wil_is_back_req(fc1)) {
 467                         wil_dbg_txrx(wil,
 468                                      "BAR: MID %d CID %d TID %d Seq 0x%03x\n",
 469                                      mid, cid, tid, seq);
 470                         wil_rx_bar(wil, cid, tid, seq);
 471                 } else {
 472                         /* print again all info. One can enable only this
 473                          * without overhead for printing every Rx frame
 474                          */
 475                         wil_dbg_txrx(wil,
 476                                      "Unhandled non-data frame FC[7:0] 0x%02x MID %d CID %d TID %d Seq 0x%03x\n",
 477                                      fc1, mid, cid, tid, seq);
 478                         wil_hex_dump_txrx("RxD ", DUMP_PREFIX_NONE, 32, 4,
 479                                           (const void *)d, sizeof(*d), false);
 480                         wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
 481                                           skb->data, skb_headlen(skb), false);
 482                 }
 483                 kfree_skb(skb);
 484                 goto again;
 485         }
 486
 487         if (unlikely(skb->len < ETH_HLEN + snaplen)) {
 488                 wil_err(wil, "Short frame, len = %d\n", skb->len);
 489                 stats->rx_short_frame++;
 490                 kfree_skb(skb);
 491                 goto again;
 492         }
 493
 494         /* L4 IDENT is on when HW calculated checksum, check status
 495          * and in case of error drop the packet
 496          * higher stack layers will handle retransmission (if required)
 497          */
 498         if (likely(d->dma.status & RX_DMA_STATUS_L4I)) {
 499                 /* L4 protocol identified, csum calculated */
 500                 if (likely((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0))
 501                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 502                 /* If HW reports bad checksum, let IP stack re-check it
 503                  * For example, HW don't understand Microsoft IP stack that
 504                  * mis-calculates TCP checksum - if it should be 0x0,
 505                  * it writes 0xffff in violation of RFC 1624
 506                  */
 507         }
 508
 509         if (snaplen) {
 510                 /* Packet layout
 511                  * +-------+-------+---------+------------+------+
 512                  * | SA(6) | DA(6) | SNAP(6) | ETHTYPE(2) | DATA |
 513                  * +-------+-------+---------+------------+------+
 514                  * Need to remove SNAP, shifting SA and DA forward
 515                  */
 516                 memmove(skb->data + snaplen, skb->data, 2 * ETH_ALEN);
 517                 skb_pull(skb, snaplen);
 518         }
 519
 520         return skb;
 521 }
 522
 523 /**
 524  * allocate and fill up to @count buffers in rx ring
 525  * buffers posted at @swtail
 526  */
 527 static int wil_rx_refill(struct wil6210_priv *wil, int count)
 528 {
 529         struct net_device *ndev = wil_to_ndev(wil);
 530         struct vring *v = &wil->vring_rx;
 531         u32 next_tail;
 532         int rc = 0;
 533         int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
 534                         WIL6210_RTAP_SIZE : 0;
 535
 536         for (; next_tail = wil_vring_next_tail(v),
 537                         (next_tail != v->swhead) && (count-- > 0);
 538                         v->swtail = next_tail) {
 539                 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
 540                 if (unlikely(rc)) {
 541                         wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
 542                                 rc, v->swtail);
 543                         break;
 544                 }
 545         }
 546         wil_w(wil, v->hwtail, v->swtail);
 547
 548         return rc;
 549 }
 550
 551 /*
 552  * Pass Rx packet to the netif. Update statistics.
 553  * Called in softirq context (NAPI poll).
 554  */
 555 void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 556 {
 557         gro_result_t rc = GRO_NORMAL;
 558         struct wil6210_priv *wil = ndev_to_wil(ndev);
 559         struct wireless_dev *wdev = wil_to_wdev(wil);
 560         unsigned int len = skb->len;
 561         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 562         int cid = wil_rxdesc_cid(d); /* always 0..7, no need to check */
 563         struct ethhdr *eth = (void *)skb->data;
 564         /* here looking for DA, not A1, thus Rxdesc's 'mcast' indication
 565          * is not suitable, need to look at data
 566          */
 567         int mcast = is_multicast_ether_addr(eth->h_dest);
 568         struct wil_net_stats *stats = &wil->sta[cid].stats;
 569         struct sk_buff *xmit_skb = NULL;
 570         static const char * const gro_res_str[] = {
 571                 [GRO_MERGED]            = "GRO_MERGED",
 572                 [GRO_MERGED_FREE]       = "GRO_MERGED_FREE",
 573                 [GRO_HELD]              = "GRO_HELD",
 574                 [GRO_NORMAL]            = "GRO_NORMAL",
 575                 [GRO_DROP]              = "GRO_DROP",
 576         };
 577
 578         if (ndev->features & NETIF_F_RXHASH)
 579                 /* fake L4 to ensure it won't be re-calculated later
 580                  * set hash to any non-zero value to activate rps
 581                  * mechanism, core will be chosen according
 582                  * to user-level rps configuration.
 583                  */
 584                 skb_set_hash(skb, 1, PKT_HASH_TYPE_L4);
 585
 586         skb_orphan(skb);
 587
 588         if (wdev->iftype == NL80211_IFTYPE_AP && !wil->ap_isolate) {
 589                 if (mcast) {
 590                         /* send multicast frames both to higher layers in
 591                          * local net stack and back to the wireless medium
 592                          */
 593                         xmit_skb = skb_copy(skb, GFP_ATOMIC);
 594                 } else {
 595                         int xmit_cid = wil_find_cid(wil, eth->h_dest);
 596
 597                         if (xmit_cid >= 0) {
 598                                 /* The destination station is associated to
 599                                  * this AP (in this VLAN), so send the frame
 600                                  * directly to it and do not pass it to local
 601                                  * net stack.
 602                                  */
 603                                 xmit_skb = skb;
 604                                 skb = NULL;
 605                         }
 606                 }
 607         }
 608         if (xmit_skb) {
 609                 /* Send to wireless media and increase priority by 256 to
 610                  * keep the received priority instead of reclassifying
 611                  * the frame (see cfg80211_classify8021d).
 612                  */
 613                 xmit_skb->dev = ndev;
 614                 xmit_skb->priority += 256;
 615                 xmit_skb->protocol = htons(ETH_P_802_3);
 616                 skb_reset_network_header(xmit_skb);
 617                 skb_reset_mac_header(xmit_skb);
 618                 wil_dbg_txrx(wil, "Rx -> Tx %d bytes\n", len);
 619                 dev_queue_xmit(xmit_skb);
 620         }
 621
 622         if (skb) { /* deliver to local stack */
 623
 624                 skb->protocol = eth_type_trans(skb, ndev);
 625                 rc = napi_gro_receive(&wil->napi_rx, skb);
 626                 wil_dbg_txrx(wil, "Rx complete %d bytes => %s\n",
 627                              len, gro_res_str[rc]);
 628         }
 629         /* statistics. rc set to GRO_NORMAL for AP bridging */
 630         if (unlikely(rc == GRO_DROP)) {
 631                 ndev->stats.rx_dropped++;
 632                 stats->rx_dropped++;
 633                 wil_dbg_txrx(wil, "Rx drop %d bytes\n", len);
 634         } else {
 635                 ndev->stats.rx_packets++;
 636                 stats->rx_packets++;
 637                 ndev->stats.rx_bytes += len;
 638                 stats->rx_bytes += len;
 639                 if (mcast)
 640                         ndev->stats.multicast++;
 641         }
 642 }
 643
 644 /**
 645  * Proceed all completed skb's from Rx VRING
 646  *
 647  * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
 648  */
 649 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
 650 {
 651         struct net_device *ndev = wil_to_ndev(wil);
 652         struct vring *v = &wil->vring_rx;
 653         struct sk_buff *skb;
 654
 655         if (unlikely(!v->va)) {
 656                 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
 657                 return;
 658         }
 659         wil_dbg_txrx(wil, "%s()\n", __func__);
 660         while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
 661                 (*quota)--;
 662
 663                 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 664                         skb->dev = ndev;
 665                         skb_reset_mac_header(skb);
 666                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 667                         skb->pkt_type = PACKET_OTHERHOST;
 668                         skb->protocol = htons(ETH_P_802_2);
 669                         wil_netif_rx_any(skb, ndev);
 670                 } else {
 671                         wil_rx_reorder(wil, skb);
 672                 }
 673         }
 674         wil_rx_refill(wil, v->size);
 675 }
 676
 677 int wil_rx_init(struct wil6210_priv *wil, u16 size)
 678 {
 679         struct vring *vring = &wil->vring_rx;
 680         int rc;
 681
 682         wil_dbg_misc(wil, "%s()\n", __func__);
 683
 684         if (vring->va) {
 685                 wil_err(wil, "Rx ring already allocated\n");
 686                 return -EINVAL;
 687         }
 688
 689         vring->size = size;
 690         rc = wil_vring_alloc(wil, vring);
 691         if (rc)
 692                 return rc;
 693
 694         rc = wmi_rx_chain_add(wil, vring);
 695         if (rc)
 696                 goto err_free;
 697
 698         rc = wil_rx_refill(wil, vring->size);
 699         if (rc)
 700                 goto err_free;
 701
 702         return 0;
 703  err_free:
 704         wil_vring_free(wil, vring, 0);
 705
 706         return rc;
 707 }
 708
 709 void wil_rx_fini(struct wil6210_priv *wil)
 710 {
 711         struct vring *vring = &wil->vring_rx;
 712
 713         wil_dbg_misc(wil, "%s()\n", __func__);
 714
 715         if (vring->va)
 716                 wil_vring_free(wil, vring, 0);
 717 }
 718
 719 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
 720                       int cid, int tid)
 721 {
 722         int rc;
 723         struct wmi_vring_cfg_cmd cmd = {
 724                 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
 725                 .vring_cfg = {
 726                         .tx_sw_ring = {
 727                                 .max_mpdu_size =
 728                                         cpu_to_le16(wil_mtu2macbuf(mtu_max)),
 729                                 .ring_size = cpu_to_le16(size),
 730                         },
 731                         .ringid = id,
 732                         .cidxtid = mk_cidxtid(cid, tid),
 733                         .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
 734                         .mac_ctrl = 0,
 735                         .to_resolution = 0,
 736                         .agg_max_wsize = 0,
 737                         .schd_params = {
 738                                 .priority = cpu_to_le16(0),
 739                                 .timeslot_us = cpu_to_le16(0xfff),
 740                         },
 741                 },
 742         };
 743         struct {
 744                 struct wil6210_mbox_hdr_wmi wmi;
 745                 struct wmi_vring_cfg_done_event cmd;
 746         } __packed reply;
 747         struct vring *vring = &wil->vring_tx[id];
 748         struct vring_tx_data *txdata = &wil->vring_tx_data[id];
 749
 750         wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__,
 751                      cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
 752
 753         if (vring->va) {
 754                 wil_err(wil, "Tx ring [%d] already allocated\n", id);
 755                 rc = -EINVAL;
 756                 goto out;
 757         }
 758
 759         memset(txdata, 0, sizeof(*txdata));
 760         spin_lock_init(&txdata->lock);
 761         vring->size = size;
 762         rc = wil_vring_alloc(wil, vring);
 763         if (rc)
 764                 goto out;
 765
 766         wil->vring2cid_tid[id][0] = cid;
 767         wil->vring2cid_tid[id][1] = tid;
 768
 769         cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
 770
 771         if (!wil->privacy)
 772                 txdata->dot1x_open = true;
 773         rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
 774                       WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
 775         if (rc)
 776                 goto out_free;
 777
 778         if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
 779                 wil_err(wil, "Tx config failed, status 0x%02x\n",
 780                         reply.cmd.status);
 781                 rc = -EINVAL;
 782                 goto out_free;
 783         }
 784         vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
 785
 786         txdata->enabled = 1;
 787         if (txdata->dot1x_open && (agg_wsize >= 0))
 788                 wil_addba_tx_request(wil, id, agg_wsize);
 789
 790         return 0;
 791  out_free:
 792         txdata->dot1x_open = false;
 793         txdata->enabled = 0;
 794         wil_vring_free(wil, vring, 1);
 795  out:
 796
 797         return rc;
 798 }
 799
 800 int wil_vring_init_bcast(struct wil6210_priv *wil, int id, int size)
 801 {
 802         int rc;
 803         struct wmi_bcast_vring_cfg_cmd cmd = {
 804                 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
 805                 .vring_cfg = {
 806                         .tx_sw_ring = {
 807                                 .max_mpdu_size =
 808                                         cpu_to_le16(wil_mtu2macbuf(mtu_max)),
 809                                 .ring_size = cpu_to_le16(size),
 810                         },
 811                         .ringid = id,
 812                         .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
 813                 },
 814         };
 815         struct {
 816                 struct wil6210_mbox_hdr_wmi wmi;
 817                 struct wmi_vring_cfg_done_event cmd;
 818         } __packed reply;
 819         struct vring *vring = &wil->vring_tx[id];
 820         struct vring_tx_data *txdata = &wil->vring_tx_data[id];
 821
 822         wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__,
 823                      cmd.vring_cfg.tx_sw_ring.max_mpdu_size);
 824
 825         if (vring->va) {
 826                 wil_err(wil, "Tx ring [%d] already allocated\n", id);
 827                 rc = -EINVAL;
 828                 goto out;
 829         }
 830
 831         memset(txdata, 0, sizeof(*txdata));
 832         spin_lock_init(&txdata->lock);
 833         vring->size = size;
 834         rc = wil_vring_alloc(wil, vring);
 835         if (rc)
 836                 goto out;
 837
 838         wil->vring2cid_tid[id][0] = WIL6210_MAX_CID; /* CID */
 839         wil->vring2cid_tid[id][1] = 0; /* TID */
 840
 841         cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
 842
 843         if (!wil->privacy)
 844                 txdata->dot1x_open = true;
 845         rc = wmi_call(wil, WMI_BCAST_VRING_CFG_CMDID, &cmd, sizeof(cmd),
 846                       WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
 847         if (rc)
 848                 goto out_free;
 849
 850         if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
 851                 wil_err(wil, "Tx config failed, status 0x%02x\n",
 852                         reply.cmd.status);
 853                 rc = -EINVAL;
 854                 goto out_free;
 855         }
 856         vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
 857
 858         txdata->enabled = 1;
 859
 860         return 0;
 861  out_free:
 862         txdata->enabled = 0;
 863         txdata->dot1x_open = false;
 864         wil_vring_free(wil, vring, 1);
 865  out:
 866
 867         return rc;
 868 }
 869
 870 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
 871 {
 872         struct vring *vring = &wil->vring_tx[id];
 873         struct vring_tx_data *txdata = &wil->vring_tx_data[id];
 874
 875         WARN_ON(!mutex_is_locked(&wil->mutex));
 876
 877         if (!vring->va)
 878                 return;
 879
 880         wil_dbg_misc(wil, "%s() id=%d\n", __func__, id);
 881
 882         spin_lock_bh(&txdata->lock);
 883         txdata->dot1x_open = false;
 884         txdata->enabled = 0; /* no Tx can be in progress or start anew */
 885         spin_unlock_bh(&txdata->lock);
 886         /* make sure NAPI won't touch this vring */
 887         if (test_bit(wil_status_napi_en, wil->status))
 888                 napi_synchronize(&wil->napi_tx);
 889
 890         wil_vring_free(wil, vring, 1);
 891         memset(txdata, 0, sizeof(*txdata));
 892 }
 893
 894 static struct vring *wil_find_tx_ucast(struct wil6210_priv *wil,
 895                                        struct sk_buff *skb)
 896 {
 897         int i;
 898         struct ethhdr *eth = (void *)skb->data;
 899         int cid = wil_find_cid(wil, eth->h_dest);
 900
 901         if (cid < 0)
 902                 return NULL;
 903
 904         /* TODO: fix for multiple TID */
 905         for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) {
 906                 if (!wil->vring_tx_data[i].dot1x_open &&
 907                     (skb->protocol != cpu_to_be16(ETH_P_PAE)))
 908                         continue;
 909                 if (wil->vring2cid_tid[i][0] == cid) {
 910                         struct vring *v = &wil->vring_tx[i];
 911
 912                         wil_dbg_txrx(wil, "%s(%pM) -> [%d]\n",
 913                                      __func__, eth->h_dest, i);
 914                         if (v->va) {
 915                                 return v;
 916                         } else {
 917                                 wil_dbg_txrx(wil, "vring[%d] not valid\n", i);
 918                                 return NULL;
 919                         }
 920                 }
 921         }
 922
 923         return NULL;
 924 }
 925
 926 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
 927                         struct sk_buff *skb);
 928
 929 static struct vring *wil_find_tx_vring_sta(struct wil6210_priv *wil,
 930                                            struct sk_buff *skb)
 931 {
 932         struct vring *v;
 933         int i;
 934         u8 cid;
 935
 936         /* In the STA mode, it is expected to have only 1 VRING
 937          * for the AP we connected to.
 938          * find 1-st vring eligible for this skb and use it.
 939          */
 940         for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
 941                 v = &wil->vring_tx[i];
 942                 if (!v->va)
 943                         continue;
 944
 945                 cid = wil->vring2cid_tid[i][0];
 946                 if (cid >= WIL6210_MAX_CID) /* skip BCAST */
 947                         continue;
 948
 949                 if (!wil->vring_tx_data[i].dot1x_open &&
 950                     (skb->protocol != cpu_to_be16(ETH_P_PAE)))
 951                         continue;
 952
 953                 wil_dbg_txrx(wil, "Tx -> ring %d\n", i);
 954
 955                 return v;
 956         }
 957
 958         wil_dbg_txrx(wil, "Tx while no vrings active?\n");
 959
 960         return NULL;
 961 }
 962
 963 /* Use one of 2 strategies:
 964  *
 965  * 1. New (real broadcast):
 966  *    use dedicated broadcast vring
 967  * 2. Old (pseudo-DMS):
 968  *    Find 1-st vring and return it;
 969  *    duplicate skb and send it to other active vrings;
 970  *    in all cases override dest address to unicast peer's address
 971  * Use old strategy when new is not supported yet:
 972  *  - for PBSS
 973  */
 974 static struct vring *wil_find_tx_bcast_1(struct wil6210_priv *wil,
 975                                          struct sk_buff *skb)
 976 {
 977         struct vring *v;
 978         int i = wil->bcast_vring;
 979
 980         if (i < 0)
 981                 return NULL;
 982         v = &wil->vring_tx[i];
 983         if (!v->va)
 984                 return NULL;
 985         if (!wil->vring_tx_data[i].dot1x_open &&
 986             (skb->protocol != cpu_to_be16(ETH_P_PAE)))
 987                 return NULL;
 988
 989         return v;
 990 }
 991
 992 static void wil_set_da_for_vring(struct wil6210_priv *wil,
 993                                  struct sk_buff *skb, int vring_index)
 994 {
 995         struct ethhdr *eth = (void *)skb->data;
 996         int cid = wil->vring2cid_tid[vring_index][0];
 997
 998         ether_addr_copy(eth->h_dest, wil->sta[cid].addr);
 999 }
1000
1001 static struct vring *wil_find_tx_bcast_2(struct wil6210_priv *wil,
1002                                          struct sk_buff *skb)
1003 {
1004         struct vring *v, *v2;
1005         struct sk_buff *skb2;
1006         int i;
1007         u8 cid;
1008         struct ethhdr *eth = (void *)skb->data;
1009         char *src = eth->h_source;
1010
1011         /* find 1-st vring eligible for data */
1012         for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
1013                 v = &wil->vring_tx[i];
1014                 if (!v->va)
1015                         continue;
1016
1017                 cid = wil->vring2cid_tid[i][0];
1018                 if (cid >= WIL6210_MAX_CID) /* skip BCAST */
1019                         continue;
1020                 if (!wil->vring_tx_data[i].dot1x_open &&
1021                     (skb->protocol != cpu_to_be16(ETH_P_PAE)))
1022                         continue;
1023
1024                 /* don't Tx back to source when re-routing Rx->Tx at the AP */
1025                 if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN))
1026                         continue;
1027
1028                 goto found;
1029         }
1030
1031         wil_dbg_txrx(wil, "Tx while no vrings active?\n");
1032
1033         return NULL;
1034
1035 found:
1036         wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
1037         wil_set_da_for_vring(wil, skb, i);
1038
1039         /* find other active vrings and duplicate skb for each */
1040         for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
1041                 v2 = &wil->vring_tx[i];
1042                 if (!v2->va)
1043                         continue;
1044                 cid = wil->vring2cid_tid[i][0];
1045                 if (cid >= WIL6210_MAX_CID) /* skip BCAST */
1046                         continue;
1047                 if (!wil->vring_tx_data[i].dot1x_open &&
1048                     (skb->protocol != cpu_to_be16(ETH_P_PAE)))
1049                         continue;
1050
1051                 if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN))
1052                         continue;
1053
1054                 skb2 = skb_copy(skb, GFP_ATOMIC);
1055                 if (skb2) {
1056                         wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
1057                         wil_set_da_for_vring(wil, skb2, i);
1058                         wil_tx_vring(wil, v2, skb2);
1059                 } else {
1060                         wil_err(wil, "skb_copy failed\n");
1061                 }
1062         }
1063
1064         return v;
1065 }
1066
1067 static struct vring *wil_find_tx_bcast(struct wil6210_priv *wil,
1068                                        struct sk_buff *skb)
1069 {
1070         struct wireless_dev *wdev = wil->wdev;
1071
1072         if (wdev->iftype != NL80211_IFTYPE_AP)
1073                 return wil_find_tx_bcast_2(wil, skb);
1074
1075         return wil_find_tx_bcast_1(wil, skb);
1076 }
1077
1078 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
1079                            int vring_index)
1080 {
1081         wil_desc_addr_set(&d->dma.addr, pa);
1082         d->dma.ip_length = 0;
1083         /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
1084         d->dma.b11 = 0/*14 | BIT(7)*/;
1085         d->dma.error = 0;
1086         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
1087         d->dma.length = cpu_to_le16((u16)len);
1088         d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
1089         d->mac.d[0] = 0;
1090         d->mac.d[1] = 0;
1091         d->mac.d[2] = 0;
1092         d->mac.ucode_cmd = 0;
1093         /* translation type:  0 - bypass; 1 - 802.3; 2 - native wifi */
1094         d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
1095                       (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
1096
1097         return 0;
1098 }
1099
1100 static inline
1101 void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags)
1102 {
1103         d->mac.d[2] |= (nr_frags << MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
1104 }
1105
1106 /**
1107  * Sets the descriptor @d up for csum and/or TSO offloading. The corresponding
1108  * @skb is used to obtain the protocol and headers length.
1109  * @tso_desc_type is a descriptor type for TSO: 0 - a header, 1 - first data,
1110  * 2 - middle, 3 - last descriptor.
1111  */
1112
1113 static void wil_tx_desc_offload_setup_tso(struct vring_tx_desc *d,
1114                                           struct sk_buff *skb,
1115                                           int tso_desc_type, bool is_ipv4,
1116                                           int tcp_hdr_len, int skb_net_hdr_len)
1117 {
1118         d->dma.b11 = ETH_HLEN; /* MAC header length */
1119         d->dma.b11 |= is_ipv4 << DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS;
1120
1121         d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
1122         /* L4 header len: TCP header length */
1123         d->dma.d0 |= (tcp_hdr_len & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
1124
1125         /* Setup TSO: bit and desc type */
1126         d->dma.d0 |= (BIT(DMA_CFG_DESC_TX_0_TCP_SEG_EN_POS)) |
1127                 (tso_desc_type << DMA_CFG_DESC_TX_0_SEGMENT_BUF_DETAILS_POS);
1128         d->dma.d0 |= (is_ipv4 << DMA_CFG_DESC_TX_0_IPV4_CHECKSUM_EN_POS);
1129
1130         d->dma.ip_length = skb_net_hdr_len;
1131         /* Enable TCP/UDP checksum */
1132         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
1133         /* Calculate pseudo-header */
1134         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
1135 }
1136
1137 /**
1138  * Sets the descriptor @d up for csum. The corresponding
1139  * @skb is used to obtain the protocol and headers length.
1140  * Returns the protocol: 0 - not TCP, 1 - TCPv4, 2 - TCPv6.
1141  * Note, if d==NULL, the function only returns the protocol result.
1142  *
1143  * It is very similar to previous wil_tx_desc_offload_setup_tso. This
1144  * is "if unrolling" to optimize the critical path.
1145  */
1146
1147 static int wil_tx_desc_offload_setup(struct vring_tx_desc *d,
1148                                      struct sk_buff *skb){
1149         int protocol;
1150
1151         if (skb->ip_summed != CHECKSUM_PARTIAL)
1152                 return 0;
1153
1154         d->dma.b11 = ETH_HLEN; /* MAC header length */
1155
1156         switch (skb->protocol) {
1157         case cpu_to_be16(ETH_P_IP):
1158                 protocol = ip_hdr(skb)->protocol;
1159                 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
1160                 break;
1161         case cpu_to_be16(ETH_P_IPV6):
1162                 protocol = ipv6_hdr(skb)->nexthdr;
1163                 break;
1164         default:
1165                 return -EINVAL;
1166         }
1167
1168         switch (protocol) {
1169         case IPPROTO_TCP:
1170                 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
1171                 /* L4 header len: TCP header length */
1172                 d->dma.d0 |=
1173                 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
1174                 break;
1175         case IPPROTO_UDP:
1176                 /* L4 header len: UDP header length */
1177                 d->dma.d0 |=
1178                 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
1179                 break;
1180         default:
1181                 return -EINVAL;
1182         }
1183
1184         d->dma.ip_length = skb_network_header_len(skb);
1185         /* Enable TCP/UDP checksum */
1186         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
1187         /* Calculate pseudo-header */
1188         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
1189
1190         return 0;
1191 }
1192
1193 static inline void wil_tx_last_desc(struct vring_tx_desc *d)
1194 {
1195         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS) |
1196               BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS) |
1197               BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
1198 }
1199
1200 static inline void wil_set_tx_desc_last_tso(volatile struct vring_tx_desc *d)
1201 {
1202         d->dma.d0 |= wil_tso_type_lst <<
1203                   DMA_CFG_DESC_TX_0_SEGMENT_BUF_DETAILS_POS;
1204 }
1205
1206 static int __wil_tx_vring_tso(struct wil6210_priv *wil, struct vring *vring,
1207                               struct sk_buff *skb)
1208 {
1209         struct device *dev = wil_to_dev(wil);
1210
1211         /* point to descriptors in shared memory */
1212         volatile struct vring_tx_desc *_desc = NULL, *_hdr_desc,
1213                                       *_first_desc = NULL;
1214
1215         /* pointers to shadow descriptors */
1216         struct vring_tx_desc desc_mem, hdr_desc_mem, first_desc_mem,
1217                              *d = &hdr_desc_mem, *hdr_desc = &hdr_desc_mem,
1218                              *first_desc = &first_desc_mem;
1219
1220         /* pointer to shadow descriptors' context */
1221         struct wil_ctx *hdr_ctx, *first_ctx = NULL;
1222
1223         int descs_used = 0; /* total number of used descriptors */
1224         int sg_desc_cnt = 0; /* number of descriptors for current mss*/
1225
1226         u32 swhead = vring->swhead;
1227         int used, avail = wil_vring_avail_tx(vring);
1228         int nr_frags = skb_shinfo(skb)->nr_frags;
1229         int min_desc_required = nr_frags + 1;
1230         int mss = skb_shinfo(skb)->gso_size;    /* payload size w/o headers */
1231         int f, len, hdrlen, headlen;
1232         int vring_index = vring - wil->vring_tx;
1233         struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
1234         uint i = swhead;
1235         dma_addr_t pa;
1236         const skb_frag_t *frag = NULL;
1237         int rem_data = mss;
1238         int lenmss;
1239         int hdr_compensation_need = true;
1240         int desc_tso_type = wil_tso_type_first;
1241         bool is_ipv4;
1242         int tcp_hdr_len;
1243         int skb_net_hdr_len;
1244         int gso_type;
1245         int rc = -EINVAL;
1246
1247         wil_dbg_txrx(wil, "%s() %d bytes to vring %d\n",
1248                      __func__, skb->len, vring_index);
1249
1250         if (unlikely(!txdata->enabled))
1251                 return -EINVAL;
1252
1253         /* A typical page 4K is 3-4 payloads, we assume each fragment
1254          * is a full payload, that's how min_desc_required has been
1255          * calculated. In real we might need more or less descriptors,
1256          * this is the initial check only.
1257          */
1258         if (unlikely(avail < min_desc_required)) {
1259                 wil_err_ratelimited(wil,
1260                                     "TSO: Tx ring[%2d] full. No space for %d fragments\n",
1261                                     vring_index, min_desc_required);
1262                 return -ENOMEM;
1263         }
1264
1265         /* Header Length = MAC header len + IP header len + TCP header len*/
1266         hdrlen = ETH_HLEN +
1267                 (int)skb_network_header_len(skb) +
1268                 tcp_hdrlen(skb);
1269
1270         gso_type = skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV6 | SKB_GSO_TCPV4);
1271         switch (gso_type) {
1272         case SKB_GSO_TCPV4:
1273                 /* TCP v4, zero out the IP length and IPv4 checksum fields
1274                  * as required by the offloading doc
1275                  */
1276                 ip_hdr(skb)->tot_len = 0;
1277                 ip_hdr(skb)->check = 0;
1278                 is_ipv4 = true;
1279                 break;
1280         case SKB_GSO_TCPV6:
1281                 /* TCP v6, zero out the payload length */
1282                 ipv6_hdr(skb)->payload_len = 0;
1283                 is_ipv4 = false;
1284                 break;
1285         default:
1286                 /* other than TCPv4 or TCPv6 types are not supported for TSO.
1287                  * It is also illegal for both to be set simultaneously
1288                  */
1289                 return -EINVAL;
1290         }
1291
1292         if (skb->ip_summed != CHECKSUM_PARTIAL)
1293                 return -EINVAL;
1294
1295         /* tcp header length and skb network header length are fixed for all
1296          * packet's descriptors - read then once here
1297          */
1298         tcp_hdr_len = tcp_hdrlen(skb);
1299         skb_net_hdr_len = skb_network_header_len(skb);
1300
1301         _hdr_desc = &vring->va[i].tx;
1302
1303         pa = dma_map_single(dev, skb->data, hdrlen, DMA_TO_DEVICE);
1304         if (unlikely(dma_mapping_error(dev, pa))) {
1305                 wil_err(wil, "TSO: Skb head DMA map error\n");
1306                 goto err_exit;
1307         }
1308
1309         wil_tx_desc_map(hdr_desc, pa, hdrlen, vring_index);
1310         wil_tx_desc_offload_setup_tso(hdr_desc, skb, wil_tso_type_hdr, is_ipv4,
1311                                       tcp_hdr_len, skb_net_hdr_len);
1312         wil_tx_last_desc(hdr_desc);
1313
1314         vring->ctx[i].mapped_as = wil_mapped_as_single;
1315         hdr_ctx = &vring->ctx[i];
1316
1317         descs_used++;
1318         headlen = skb_headlen(skb) - hdrlen;
1319
1320         for (f = headlen ? -1 : 0; f < nr_frags; f++)  {
1321                 if (headlen) {
1322                         len = headlen;
1323                         wil_dbg_txrx(wil, "TSO: process skb head, len %u\n",
1324                                      len);
1325                 } else {
1326                         frag = &skb_shinfo(skb)->frags[f];
1327                         len = frag->size;
1328                         wil_dbg_txrx(wil, "TSO: frag[%d]: len %u\n", f, len);
1329                 }
1330
1331                 while (len) {
1332                         wil_dbg_txrx(wil,
1333                                      "TSO: len %d, rem_data %d, descs_used %d\n",
1334                                      len, rem_data, descs_used);
1335
1336                         if (descs_used == avail)  {
1337                                 wil_err_ratelimited(wil, "TSO: ring overflow\n");
1338                                 rc = -ENOMEM;
1339                                 goto mem_error;
1340                         }
1341
1342                         lenmss = min_t(int, rem_data, len);
1343                         i = (swhead + descs_used) % vring->size;
1344                         wil_dbg_txrx(wil, "TSO: lenmss %d, i %d\n", lenmss, i);
1345
1346                         if (!headlen) {
1347                                 pa = skb_frag_dma_map(dev, frag,
1348                                                       frag->size - len, lenmss,
1349                                                       DMA_TO_DEVICE);
1350                                 vring->ctx[i].mapped_as = wil_mapped_as_page;
1351                         } else {
1352                                 pa = dma_map_single(dev,
1353                                                     skb->data +
1354                                                     skb_headlen(skb) - headlen,
1355                                                     lenmss,
1356                                                     DMA_TO_DEVICE);
1357                                 vring->ctx[i].mapped_as = wil_mapped_as_single;
1358                                 headlen -= lenmss;
1359                         }
1360
1361                         if (unlikely(dma_mapping_error(dev, pa))) {
1362                                 wil_err(wil, "TSO: DMA map page error\n");
1363                                 goto mem_error;
1364                         }
1365
1366                         _desc = &vring->va[i].tx;
1367
1368                         if (!_first_desc) {
1369                                 _first_desc = _desc;
1370                                 first_ctx = &vring->ctx[i];
1371                                 d = first_desc;
1372                         } else {
1373                                 d = &desc_mem;
1374                         }
1375
1376                         wil_tx_desc_map(d, pa, lenmss, vring_index);
1377                         wil_tx_desc_offload_setup_tso(d, skb, desc_tso_type,
1378                                                       is_ipv4, tcp_hdr_len,
1379                                                       skb_net_hdr_len);
1380
1381                         /* use tso_type_first only once */
1382                         desc_tso_type = wil_tso_type_mid;
1383
1384                         descs_used++;  /* desc used so far */
1385                         sg_desc_cnt++; /* desc used for this segment */
1386                         len -= lenmss;
1387                         rem_data -= lenmss;
1388
1389                         wil_dbg_txrx(wil,
1390                                      "TSO: len %d, rem_data %d, descs_used %d, sg_desc_cnt %d,\n",
1391                                      len, rem_data, descs_used, sg_desc_cnt);
1392
1393                         /* Close the segment if reached mss size or last frag*/
1394                         if (rem_data == 0 || (f == nr_frags - 1 && len == 0)) {
1395                                 if (hdr_compensation_need) {
1396                                         /* first segment include hdr desc for
1397                                          * release
1398                                          */
1399                                         hdr_ctx->nr_frags = sg_desc_cnt;
1400                                         wil_tx_desc_set_nr_frags(first_desc,
1401                                                                  sg_desc_cnt +
1402                                                                  1);
1403                                         hdr_compensation_need = false;
1404                                 } else {
1405                                         wil_tx_desc_set_nr_frags(first_desc,
1406                                                                  sg_desc_cnt);
1407                                 }
1408                                 first_ctx->nr_frags = sg_desc_cnt - 1;
1409
1410                                 wil_tx_last_desc(d);
1411
1412                                 /* first descriptor may also be the last
1413                                  * for this mss - make sure not to copy
1414                                  * it twice
1415                                  */
1416                                 if (first_desc != d)
1417                                         *_first_desc = *first_desc;
1418
1419                                 /*last descriptor will be copied at the end
1420                                  * of this TS processing
1421                                  */
1422                                 if (f < nr_frags - 1 || len > 0)
1423                                         *_desc = *d;
1424
1425                                 rem_data = mss;
1426                                 _first_desc = NULL;
1427                                 sg_desc_cnt = 0;
1428                         } else if (first_desc != d) /* update mid descriptor */
1429                                         *_desc = *d;
1430                 }
1431         }
1432
1433         /* first descriptor may also be the last.
1434          * in this case d pointer is invalid
1435          */
1436         if (_first_desc == _desc)
1437                 d = first_desc;
1438
1439         /* Last data descriptor */
1440         wil_set_tx_desc_last_tso(d);
1441         *_desc = *d;
1442
1443         /* Fill the total number of descriptors in first desc (hdr)*/
1444         wil_tx_desc_set_nr_frags(hdr_desc, descs_used);
1445         *_hdr_desc = *hdr_desc;
1446
1447         /* hold reference to skb
1448          * to prevent skb release before accounting
1449          * in case of immediate "tx done"
1450          */
1451         vring->ctx[i].skb = skb_get(skb);
1452
1453         /* performance monitoring */
1454         used = wil_vring_used_tx(vring);
1455         if (wil_val_in_range(vring_idle_trsh,
1456                              used, used + descs_used)) {
1457                 txdata->idle += get_cycles() - txdata->last_idle;
1458                 wil_dbg_txrx(wil,  "Ring[%2d] not idle %d -> %d\n",
1459                              vring_index, used, used + descs_used);
1460         }
1461
1462         /* advance swhead */
1463         wil_vring_advance_head(vring, descs_used);
1464         wil_dbg_txrx(wil, "TSO: Tx swhead %d -> %d\n", swhead, vring->swhead);
1465
1466         /* make sure all writes to descriptors (shared memory) are done before
1467          * committing them to HW
1468          */
1469         wmb();
1470
1471         wil_w(wil, vring->hwtail, vring->swhead);
1472         return 0;
1473
1474 mem_error:
1475         while (descs_used > 0) {
1476                 struct wil_ctx *ctx;
1477
1478                 i = (swhead + descs_used) % vring->size;
1479                 d = (struct vring_tx_desc *)&vring->va[i].tx;
1480                 _desc = &vring->va[i].tx;
1481                 *d = *_desc;
1482                 _desc->dma.status = TX_DMA_STATUS_DU;
1483                 ctx = &vring->ctx[i];
1484                 wil_txdesc_unmap(dev, d, ctx);
1485                 memset(ctx, 0, sizeof(*ctx));
1486                 descs_used--;
1487         }
1488 err_exit:
1489         return rc;
1490 }
1491
1492 static int __wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
1493                           struct sk_buff *skb)
1494 {
1495         struct device *dev = wil_to_dev(wil);
1496         struct vring_tx_desc dd, *d = &dd;
1497         volatile struct vring_tx_desc *_d;
1498         u32 swhead = vring->swhead;
1499         int avail = wil_vring_avail_tx(vring);
1500         int nr_frags = skb_shinfo(skb)->nr_frags;
1501         uint f = 0;
1502         int vring_index = vring - wil->vring_tx;
1503         struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
1504         uint i = swhead;
1505         dma_addr_t pa;
1506         int used;
1507         bool mcast = (vring_index == wil->bcast_vring);
1508         uint len = skb_headlen(skb);
1509
1510         wil_dbg_txrx(wil, "%s() %d bytes to vring %d\n",
1511                      __func__, skb->len, vring_index);
1512
1513         if (unlikely(!txdata->enabled))
1514                 return -EINVAL;
1515
1516         if (unlikely(avail < 1 + nr_frags)) {
1517                 wil_err_ratelimited(wil,
1518                                     "Tx ring[%2d] full. No space for %d fragments\n",
1519                                     vring_index, 1 + nr_frags);
1520                 return -ENOMEM;
1521         }
1522         _d = &vring->va[i].tx;
1523
1524         pa = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1525
1526         wil_dbg_txrx(wil, "Tx[%2d] skb %d bytes 0x%p -> %pad\n", vring_index,
1527                      skb_headlen(skb), skb->data, &pa);
1528         wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
1529                           skb->data, skb_headlen(skb), false);
1530
1531         if (unlikely(dma_mapping_error(dev, pa)))
1532                 return -EINVAL;
1533         vring->ctx[i].mapped_as = wil_mapped_as_single;
1534         /* 1-st segment */
1535         wil_tx_desc_map(d, pa, len, vring_index);
1536         if (unlikely(mcast)) {
1537                 d->mac.d[0] |= BIT(MAC_CFG_DESC_TX_0_MCS_EN_POS); /* MCS 0 */
1538                 if (unlikely(len > WIL_BCAST_MCS0_LIMIT)) /* set MCS 1 */
1539                         d->mac.d[0] |= (1 << MAC_CFG_DESC_TX_0_MCS_INDEX_POS);
1540         }
1541         /* Process TCP/UDP checksum offloading */
1542         if (unlikely(wil_tx_desc_offload_setup(d, skb))) {
1543                 wil_err(wil, "Tx[%2d] Failed to set cksum, drop packet\n",
1544                         vring_index);
1545                 goto dma_error;
1546         }
1547
1548         vring->ctx[i].nr_frags = nr_frags;
1549         wil_tx_desc_set_nr_frags(d, nr_frags + 1);
1550
1551         /* middle segments */
1552         for (; f < nr_frags; f++) {
1553                 const struct skb_frag_struct *frag =
1554                                 &skb_shinfo(skb)->frags[f];
1555                 int len = skb_frag_size(frag);
1556
1557                 *_d = *d;
1558                 wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i);
1559                 wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4,
1560                                   (const void *)d, sizeof(*d), false);
1561                 i = (swhead + f + 1) % vring->size;
1562                 _d = &vring->va[i].tx;
1563                 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
1564                                       DMA_TO_DEVICE);
1565                 if (unlikely(dma_mapping_error(dev, pa))) {
1566                         wil_err(wil, "Tx[%2d] failed to map fragment\n",
1567                                 vring_index);
1568                         goto dma_error;
1569                 }
1570                 vring->ctx[i].mapped_as = wil_mapped_as_page;
1571                 wil_tx_desc_map(d, pa, len, vring_index);
1572                 /* no need to check return code -
1573                  * if it succeeded for 1-st descriptor,
1574                  * it will succeed here too
1575                  */
1576                 wil_tx_desc_offload_setup(d, skb);
1577         }
1578         /* for the last seg only */
1579         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
1580         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
1581         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
1582         *_d = *d;
1583         wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i);
1584         wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4,
1585                           (const void *)d, sizeof(*d), false);
1586
1587         /* hold reference to skb
1588          * to prevent skb release before accounting
1589          * in case of immediate "tx done"
1590          */
1591         vring->ctx[i].skb = skb_get(skb);
1592
1593         /* performance monitoring */
1594         used = wil_vring_used_tx(vring);
1595         if (wil_val_in_range(vring_idle_trsh,
1596                              used, used + nr_frags + 1)) {
1597                 txdata->idle += get_cycles() - txdata->last_idle;
1598                 wil_dbg_txrx(wil,  "Ring[%2d] not idle %d -> %d\n",
1599                              vring_index, used, used + nr_frags + 1);
1600         }
1601
1602         /* advance swhead */
1603         wil_vring_advance_head(vring, nr_frags + 1);
1604         wil_dbg_txrx(wil, "Tx[%2d] swhead %d -> %d\n", vring_index, swhead,
1605                      vring->swhead);
1606         trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
1607
1608         /* make sure all writes to descriptors (shared memory) are done before
1609          * committing them to HW
1610          */
1611         wmb();
1612
1613         wil_w(wil, vring->hwtail, vring->swhead);
1614
1615         return 0;
1616  dma_error:
1617         /* unmap what we have mapped */
1618         nr_frags = f + 1; /* frags mapped + one for skb head */
1619         for (f = 0; f < nr_frags; f++) {
1620                 struct wil_ctx *ctx;
1621
1622                 i = (swhead + f) % vring->size;
1623                 ctx = &vring->ctx[i];
1624                 _d = &vring->va[i].tx;
1625                 *d = *_d;
1626                 _d->dma.status = TX_DMA_STATUS_DU;
1627                 wil_txdesc_unmap(dev, d, ctx);
1628
1629                 memset(ctx, 0, sizeof(*ctx));
1630         }
1631
1632         return -EINVAL;
1633 }
1634
1635 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
1636                         struct sk_buff *skb)
1637 {
1638         int vring_index = vring - wil->vring_tx;
1639         struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index];
1640         int rc;
1641
1642         spin_lock(&txdata->lock);
1643
1644         rc = (skb_is_gso(skb) ? __wil_tx_vring_tso : __wil_tx_vring)
1645              (wil, vring, skb);
1646
1647         spin_unlock(&txdata->lock);
1648
1649         return rc;
1650 }
1651
1652 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1653 {
1654         struct wil6210_priv *wil = ndev_to_wil(ndev);
1655         struct ethhdr *eth = (void *)skb->data;
1656         bool bcast = is_multicast_ether_addr(eth->h_dest);
1657         struct vring *vring;
1658         static bool pr_once_fw;
1659         int rc;
1660
1661         wil_dbg_txrx(wil, "%s()\n", __func__);
1662         if (unlikely(!test_bit(wil_status_fwready, wil->status))) {
1663                 if (!pr_once_fw) {
1664                         wil_err(wil, "FW not ready\n");
1665                         pr_once_fw = true;
1666                 }
1667                 goto drop;
1668         }
1669         if (unlikely(!test_bit(wil_status_fwconnected, wil->status))) {
1670                 wil_err_ratelimited(wil, "FW not connected\n");
1671                 goto drop;
1672         }
1673         if (unlikely(wil->wdev->iftype == NL80211_IFTYPE_MONITOR)) {
1674                 wil_err(wil, "Xmit in monitor mode not supported\n");
1675                 goto drop;
1676         }
1677         pr_once_fw = false;
1678
1679         /* find vring */
1680         if (wil->wdev->iftype == NL80211_IFTYPE_STATION) {
1681                 /* in STA mode (ESS), all to same VRING */
1682                 vring = wil_find_tx_vring_sta(wil, skb);
1683         } else { /* direct communication, find matching VRING */
1684                 vring = bcast ? wil_find_tx_bcast(wil, skb) :
1685                                 wil_find_tx_ucast(wil, skb);
1686         }
1687         if (unlikely(!vring)) {
1688                 wil_dbg_txrx(wil, "No Tx VRING found for %pM\n", eth->h_dest);
1689                 goto drop;
1690         }
1691         /* set up vring entry */
1692         rc = wil_tx_vring(wil, vring, skb);
1693
1694         /* do we still have enough room in the vring? */
1695         if (unlikely(wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring))) {
1696                 netif_tx_stop_all_queues(wil_to_ndev(wil));
1697                 wil_dbg_txrx(wil, "netif_tx_stop : ring full\n");
1698         }
1699
1700         switch (rc) {
1701         case 0:
1702                 /* statistics will be updated on the tx_complete */
1703                 dev_kfree_skb_any(skb);
1704                 return NETDEV_TX_OK;
1705         case -ENOMEM:
1706                 return NETDEV_TX_BUSY;
1707         default:
1708                 break; /* goto drop; */
1709         }
1710  drop:
1711         ndev->stats.tx_dropped++;
1712         dev_kfree_skb_any(skb);
1713
1714         return NET_XMIT_DROP;
1715 }
1716
1717 static inline bool wil_need_txstat(struct sk_buff *skb)
1718 {
1719         struct ethhdr *eth = (void *)skb->data;
1720
1721         return is_unicast_ether_addr(eth->h_dest) && skb->sk &&
1722                (skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS);
1723 }
1724
1725 static inline void wil_consume_skb(struct sk_buff *skb, bool acked)
1726 {
1727         if (unlikely(wil_need_txstat(skb)))
1728                 skb_complete_wifi_ack(skb, acked);
1729         else
1730                 acked ? dev_consume_skb_any(skb) : dev_kfree_skb_any(skb);
1731 }
1732
1733 /**
1734  * Clean up transmitted skb's from the Tx VRING
1735  *
1736  * Return number of descriptors cleared
1737  *
1738  * Safe to call from IRQ
1739  */
1740 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
1741 {
1742         struct net_device *ndev = wil_to_ndev(wil);
1743         struct device *dev = wil_to_dev(wil);
1744         struct vring *vring = &wil->vring_tx[ringid];
1745         struct vring_tx_data *txdata = &wil->vring_tx_data[ringid];
1746         int done = 0;
1747         int cid = wil->vring2cid_tid[ringid][0];
1748         struct wil_net_stats *stats = NULL;
1749         volatile struct vring_tx_desc *_d;
1750         int used_before_complete;
1751         int used_new;
1752
1753         if (unlikely(!vring->va)) {
1754                 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
1755                 return 0;
1756         }
1757
1758         if (unlikely(!txdata->enabled)) {
1759                 wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid);
1760                 return 0;
1761         }
1762
1763         wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
1764
1765         used_before_complete = wil_vring_used_tx(vring);
1766
1767         if (cid < WIL6210_MAX_CID)
1768                 stats = &wil->sta[cid].stats;
1769
1770         while (!wil_vring_is_empty(vring)) {
1771                 int new_swtail;
1772                 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1773                 /**
1774                  * For the fragmented skb, HW will set DU bit only for the
1775                  * last fragment. look for it.
1776                  * In TSO the first DU will include hdr desc
1777                  */
1778                 int lf = (vring->swtail + ctx->nr_frags) % vring->size;
1779                 /* TODO: check we are not past head */
1780
1781                 _d = &vring->va[lf].tx;
1782                 if (unlikely(!(_d->dma.status & TX_DMA_STATUS_DU)))
1783                         break;
1784
1785                 new_swtail = (lf + 1) % vring->size;
1786                 while (vring->swtail != new_swtail) {
1787                         struct vring_tx_desc dd, *d = &dd;
1788                         u16 dmalen;
1789                         struct sk_buff *skb;
1790
1791                         ctx = &vring->ctx[vring->swtail];
1792                         skb = ctx->skb;
1793                         _d = &vring->va[vring->swtail].tx;
1794
1795                         *d = *_d;
1796
1797                         dmalen = le16_to_cpu(d->dma.length);
1798                         trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
1799                                               d->dma.error);
1800                         wil_dbg_txrx(wil,
1801                                      "TxC[%2d][%3d] : %d bytes, status 0x%02x err 0x%02x\n",
1802                                      ringid, vring->swtail, dmalen,
1803                                      d->dma.status, d->dma.error);
1804                         wil_hex_dump_txrx("TxCD ", DUMP_PREFIX_NONE, 32, 4,
1805                                           (const void *)d, sizeof(*d), false);
1806
1807                         wil_txdesc_unmap(dev, d, ctx);
1808
1809                         if (skb) {
1810                                 if (likely(d->dma.error == 0)) {
1811                                         ndev->stats.tx_packets++;
1812                                         ndev->stats.tx_bytes += skb->len;
1813                                         if (stats) {
1814                                                 stats->tx_packets++;
1815                                                 stats->tx_bytes += skb->len;
1816                                         }
1817                                 } else {
1818                                         ndev->stats.tx_errors++;
1819                                         if (stats)
1820                                                 stats->tx_errors++;
1821                                 }
1822                                 wil_consume_skb(skb, d->dma.error == 0);
1823                         }
1824                         memset(ctx, 0, sizeof(*ctx));
1825                         /* There is no need to touch HW descriptor:
1826                          * - ststus bit TX_DMA_STATUS_DU is set by design,
1827                          *   so hardware will not try to process this desc.,
1828                          * - rest of descriptor will be initialized on Tx.
1829                          */
1830                         vring->swtail = wil_vring_next_tail(vring);
1831                         done++;
1832                 }
1833         }
1834
1835         /* performance monitoring */
1836         used_new = wil_vring_used_tx(vring);
1837         if (wil_val_in_range(vring_idle_trsh,
1838                              used_new, used_before_complete)) {
1839                 wil_dbg_txrx(wil, "Ring[%2d] idle %d -> %d\n",
1840                              ringid, used_before_complete, used_new);
1841                 txdata->last_idle = get_cycles();
1842         }
1843
1844         if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring)) {
1845                 wil_dbg_txrx(wil, "netif_tx_wake : ring not full\n");
1846                 netif_tx_wake_all_queues(wil_to_ndev(wil));
1847         }
1848
1849         return done;
1850 }