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

   1 /*
   2  * Copyright (c) 2012 Qualcomm Atheros, Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/etherdevice.h>
  18 #include <net/ieee80211_radiotap.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/moduleparam.h>
  21
  22 #include "wil6210.h"
  23 #include "wmi.h"
  24 #include "txrx.h"
  25 #include "trace.h"
  26
  27 static bool rtap_include_phy_info;
  28 module_param(rtap_include_phy_info, bool, S_IRUGO);
  29 MODULE_PARM_DESC(rtap_include_phy_info,
  30                  " Include PHY info in the radiotap header, default - no");
  31
  32 static inline int wil_vring_is_empty(struct vring *vring)
  33 {
  34         return vring->swhead == vring->swtail;
  35 }
  36
  37 static inline u32 wil_vring_next_tail(struct vring *vring)
  38 {
  39         return (vring->swtail + 1) % vring->size;
  40 }
  41
  42 static inline void wil_vring_advance_head(struct vring *vring, int n)
  43 {
  44         vring->swhead = (vring->swhead + n) % vring->size;
  45 }
  46
  47 static inline int wil_vring_is_full(struct vring *vring)
  48 {
  49         return wil_vring_next_tail(vring) == vring->swhead;
  50 }
  51 /*
  52  * Available space in Tx Vring
  53  */
  54 static inline int wil_vring_avail_tx(struct vring *vring)
  55 {
  56         u32 swhead = vring->swhead;
  57         u32 swtail = vring->swtail;
  58         int used = (vring->size + swhead - swtail) % vring->size;
  59
  60         return vring->size - used - 1;
  61 }
  62
  63 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
  64 {
  65         struct device *dev = wil_to_dev(wil);
  66         size_t sz = vring->size * sizeof(vring->va[0]);
  67         uint i;
  68
  69         BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
  70
  71         vring->swhead = 0;
  72         vring->swtail = 0;
  73         vring->ctx = kzalloc(vring->size * sizeof(vring->ctx[0]), GFP_KERNEL);
  74         if (!vring->ctx) {
  75                 vring->va = NULL;
  76                 return -ENOMEM;
  77         }
  78         /*
  79          * vring->va should be aligned on its size rounded up to power of 2
  80          * This is granted by the dma_alloc_coherent
  81          */
  82         vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
  83         if (!vring->va) {
  84                 kfree(vring->ctx);
  85                 vring->ctx = NULL;
  86                 return -ENOMEM;
  87         }
  88         /* initially, all descriptors are SW owned
  89          * For Tx and Rx, ownership bit is at the same location, thus
  90          * we can use any
  91          */
  92         for (i = 0; i < vring->size; i++) {
  93                 volatile struct vring_tx_desc *_d = &(vring->va[i].tx);
  94                 _d->dma.status = TX_DMA_STATUS_DU;
  95         }
  96
  97         wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
  98                      vring->va, (unsigned long long)vring->pa, vring->ctx);
  99
 100         return 0;
 101 }
 102
 103 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
 104                            int tx)
 105 {
 106         struct device *dev = wil_to_dev(wil);
 107         size_t sz = vring->size * sizeof(vring->va[0]);
 108
 109         while (!wil_vring_is_empty(vring)) {
 110                 dma_addr_t pa;
 111                 struct sk_buff *skb;
 112                 u16 dmalen;
 113
 114                 if (tx) {
 115                         struct vring_tx_desc dd, *d = &dd;
 116                         volatile struct vring_tx_desc *_d =
 117                                         &vring->va[vring->swtail].tx;
 118
 119                         *d = *_d;
 120                         pa = wil_desc_addr(&d->dma.addr);
 121                         dmalen = le16_to_cpu(d->dma.length);
 122                         skb = vring->ctx[vring->swtail];
 123                         if (skb) {
 124                                 dma_unmap_single(dev, pa, dmalen,
 125                                                  DMA_TO_DEVICE);
 126                                 dev_kfree_skb_any(skb);
 127                                 vring->ctx[vring->swtail] = NULL;
 128                         } else {
 129                                 dma_unmap_page(dev, pa, dmalen,
 130                                                DMA_TO_DEVICE);
 131                         }
 132                         vring->swtail = wil_vring_next_tail(vring);
 133                 } else { /* rx */
 134                         struct vring_rx_desc dd, *d = &dd;
 135                         volatile struct vring_rx_desc *_d =
 136                                         &vring->va[vring->swtail].rx;
 137
 138                         *d = *_d;
 139                         pa = wil_desc_addr(&d->dma.addr);
 140                         dmalen = le16_to_cpu(d->dma.length);
 141                         skb = vring->ctx[vring->swhead];
 142                         dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
 143                         kfree_skb(skb);
 144                         wil_vring_advance_head(vring, 1);
 145                 }
 146         }
 147         dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
 148         kfree(vring->ctx);
 149         vring->pa = 0;
 150         vring->va = NULL;
 151         vring->ctx = NULL;
 152 }
 153
 154 /**
 155  * Allocate one skb for Rx VRING
 156  *
 157  * Safe to call from IRQ
 158  */
 159 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
 160                                u32 i, int headroom)
 161 {
 162         struct device *dev = wil_to_dev(wil);
 163         unsigned int sz = RX_BUF_LEN;
 164         struct vring_rx_desc dd, *d = &dd;
 165         volatile struct vring_rx_desc *_d = &(vring->va[i].rx);
 166         dma_addr_t pa;
 167
 168         /* TODO align */
 169         struct sk_buff *skb = dev_alloc_skb(sz + headroom);
 170         if (unlikely(!skb))
 171                 return -ENOMEM;
 172
 173         skb_reserve(skb, headroom);
 174         skb_put(skb, sz);
 175
 176         pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
 177         if (unlikely(dma_mapping_error(dev, pa))) {
 178                 kfree_skb(skb);
 179                 return -ENOMEM;
 180         }
 181
 182         d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
 183         wil_desc_addr_set(&d->dma.addr, pa);
 184         /* ip_length don't care */
 185         /* b11 don't care */
 186         /* error don't care */
 187         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
 188         d->dma.length = cpu_to_le16(sz);
 189         *_d = *d;
 190         vring->ctx[i] = skb;
 191
 192         return 0;
 193 }
 194
 195 /**
 196  * Adds radiotap header
 197  *
 198  * Any error indicated as "Bad FCS"
 199  *
 200  * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
 201  *  - Rx descriptor: 32 bytes
 202  *  - Phy info
 203  */
 204 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
 205                                        struct sk_buff *skb)
 206 {
 207         struct wireless_dev *wdev = wil->wdev;
 208         struct wil6210_rtap {
 209                 struct ieee80211_radiotap_header rthdr;
 210                 /* fields should be in the order of bits in rthdr.it_present */
 211                 /* flags */
 212                 u8 flags;
 213                 /* channel */
 214                 __le16 chnl_freq __aligned(2);
 215                 __le16 chnl_flags;
 216                 /* MCS */
 217                 u8 mcs_present;
 218                 u8 mcs_flags;
 219                 u8 mcs_index;
 220         } __packed;
 221         struct wil6210_rtap_vendor {
 222                 struct wil6210_rtap rtap;
 223                 /* vendor */
 224                 u8 vendor_oui[3] __aligned(2);
 225                 u8 vendor_ns;
 226                 __le16 vendor_skip;
 227                 u8 vendor_data[0];
 228         } __packed;
 229         struct vring_rx_desc *d = wil_skb_rxdesc(skb);
 230         struct wil6210_rtap_vendor *rtap_vendor;
 231         int rtap_len = sizeof(struct wil6210_rtap);
 232         int phy_length = 0; /* phy info header size, bytes */
 233         static char phy_data[128];
 234         struct ieee80211_channel *ch = wdev->preset_chandef.chan;
 235
 236         if (rtap_include_phy_info) {
 237                 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
 238                 /* calculate additional length */
 239                 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
 240                         /**
 241                          * PHY info starts from 8-byte boundary
 242                          * there are 8-byte lines, last line may be partially
 243                          * written (HW bug), thus FW configures for last line
 244                          * to be excessive. Driver skips this last line.
 245                          */
 246                         int len = min_t(int, 8 + sizeof(phy_data),
 247                                         wil_rxdesc_phy_length(d));
 248                         if (len > 8) {
 249                                 void *p = skb_tail_pointer(skb);
 250                                 void *pa = PTR_ALIGN(p, 8);
 251                                 if (skb_tailroom(skb) >= len + (pa - p)) {
 252                                         phy_length = len - 8;
 253                                         memcpy(phy_data, pa, phy_length);
 254                                 }
 255                         }
 256                 }
 257                 rtap_len += phy_length;
 258         }
 259
 260         if (skb_headroom(skb) < rtap_len &&
 261             pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
 262                 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
 263                 return;
 264         }
 265
 266         rtap_vendor = (void *)skb_push(skb, rtap_len);
 267         memset(rtap_vendor, 0, rtap_len);
 268
 269         rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
 270         rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
 271         rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
 272                         (1 << IEEE80211_RADIOTAP_FLAGS) |
 273                         (1 << IEEE80211_RADIOTAP_CHANNEL) |
 274                         (1 << IEEE80211_RADIOTAP_MCS));
 275         if (d->dma.status & RX_DMA_STATUS_ERROR)
 276                 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
 277
 278         rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
 279         rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
 280
 281         rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
 282         rtap_vendor->rtap.mcs_flags = 0;
 283         rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
 284
 285         if (rtap_include_phy_info) {
 286                 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
 287                                 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
 288                 /* OUI for Wilocity 04:ce:14 */
 289                 rtap_vendor->vendor_oui[0] = 0x04;
 290                 rtap_vendor->vendor_oui[1] = 0xce;
 291                 rtap_vendor->vendor_oui[2] = 0x14;
 292                 rtap_vendor->vendor_ns = 1;
 293                 /* Rx descriptor + PHY data  */
 294                 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
 295                                                        phy_length);
 296                 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
 297                 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
 298                        phy_length);
 299         }
 300 }
 301
 302 /*
 303  * Fast swap in place between 2 registers
 304  */
 305 static void wil_swap_u16(u16 *a, u16 *b)
 306 {
 307         *a ^= *b;
 308         *b ^= *a;
 309         *a ^= *b;
 310 }
 311
 312 static void wil_swap_ethaddr(void *data)
 313 {
 314         struct ethhdr *eth = data;
 315         u16 *s = (u16 *)eth->h_source;
 316         u16 *d = (u16 *)eth->h_dest;
 317
 318         wil_swap_u16(s++, d++);
 319         wil_swap_u16(s++, d++);
 320         wil_swap_u16(s, d);
 321 }
 322
 323 /**
 324  * reap 1 frame from @swhead
 325  *
 326  * Rx descriptor copied to skb->cb
 327  *
 328  * Safe to call from IRQ
 329  */
 330 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
 331                                          struct vring *vring)
 332 {
 333         struct device *dev = wil_to_dev(wil);
 334         struct net_device *ndev = wil_to_ndev(wil);
 335         volatile struct vring_rx_desc *_d;
 336         struct vring_rx_desc *d;
 337         struct sk_buff *skb;
 338         dma_addr_t pa;
 339         unsigned int sz = RX_BUF_LEN;
 340         u16 dmalen;
 341         u8 ftype;
 342         u8 ds_bits;
 343
 344         BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
 345
 346         if (wil_vring_is_empty(vring))
 347                 return NULL;
 348
 349         _d = &(vring->va[vring->swhead].rx);
 350         if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
 351                 /* it is not error, we just reached end of Rx done area */
 352                 return NULL;
 353         }
 354
 355         skb = vring->ctx[vring->swhead];
 356         d = wil_skb_rxdesc(skb);
 357         *d = *_d;
 358         pa = wil_desc_addr(&d->dma.addr);
 359         vring->ctx[vring->swhead] = NULL;
 360         wil_vring_advance_head(vring, 1);
 361
 362         dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
 363         dmalen = le16_to_cpu(d->dma.length);
 364
 365         trace_wil6210_rx(vring->swhead, d);
 366         wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
 367         wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
 368                           (const void *)d, sizeof(*d), false);
 369
 370         if (dmalen > sz) {
 371                 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
 372                 kfree_skb(skb);
 373                 return NULL;
 374         }
 375         skb_trim(skb, dmalen);
 376
 377         wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
 378                           skb->data, skb_headlen(skb), false);
 379
 380
 381         wil->stats.last_mcs_rx = wil_rxdesc_mcs(d);
 382
 383         /* use radiotap header only if required */
 384         if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
 385                 wil_rx_add_radiotap_header(wil, skb);
 386
 387         /* no extra checks if in sniffer mode */
 388         if (ndev->type != ARPHRD_ETHER)
 389                 return skb;
 390         /*
 391          * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
 392          * Driver should recognize it by frame type, that is found
 393          * in Rx descriptor. If type is not data, it is 802.11 frame as is
 394          */
 395         ftype = wil_rxdesc_ftype(d) << 2;
 396         if (ftype != IEEE80211_FTYPE_DATA) {
 397                 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
 398                 /* TODO: process it */
 399                 kfree_skb(skb);
 400                 return NULL;
 401         }
 402
 403         if (skb->len < ETH_HLEN) {
 404                 wil_err(wil, "Short frame, len = %d\n", skb->len);
 405                 /* TODO: process it (i.e. BAR) */
 406                 kfree_skb(skb);
 407                 return NULL;
 408         }
 409
 410         ds_bits = wil_rxdesc_ds_bits(d);
 411         if (ds_bits == 1) {
 412                 /*
 413                  * HW bug - in ToDS mode, i.e. Rx on AP side,
 414                  * addresses get swapped
 415                  */
 416                 wil_swap_ethaddr(skb->data);
 417         }
 418
 419         return skb;
 420 }
 421
 422 /**
 423  * allocate and fill up to @count buffers in rx ring
 424  * buffers posted at @swtail
 425  */
 426 static int wil_rx_refill(struct wil6210_priv *wil, int count)
 427 {
 428         struct net_device *ndev = wil_to_ndev(wil);
 429         struct vring *v = &wil->vring_rx;
 430         u32 next_tail;
 431         int rc = 0;
 432         int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
 433                         WIL6210_RTAP_SIZE : 0;
 434
 435         for (; next_tail = wil_vring_next_tail(v),
 436                         (next_tail != v->swhead) && (count-- > 0);
 437                         v->swtail = next_tail) {
 438                 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
 439                 if (rc) {
 440                         wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
 441                                 rc, v->swtail);
 442                         break;
 443                 }
 444         }
 445         iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
 446
 447         return rc;
 448 }
 449
 450 /*
 451  * Pass Rx packet to the netif. Update statistics.
 452  * Called in softirq context (NAPI poll).
 453  */
 454 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
 455 {
 456         int rc;
 457         unsigned int len = skb->len;
 458
 459         skb_orphan(skb);
 460
 461         rc = netif_receive_skb(skb);
 462
 463         if (likely(rc == NET_RX_SUCCESS)) {
 464                 ndev->stats.rx_packets++;
 465                 ndev->stats.rx_bytes += len;
 466
 467         } else {
 468                 ndev->stats.rx_dropped++;
 469         }
 470 }
 471
 472 /**
 473  * Proceed all completed skb's from Rx VRING
 474  *
 475  * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
 476  */
 477 void wil_rx_handle(struct wil6210_priv *wil, int *quota)
 478 {
 479         struct net_device *ndev = wil_to_ndev(wil);
 480         struct vring *v = &wil->vring_rx;
 481         struct sk_buff *skb;
 482
 483         if (!v->va) {
 484                 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
 485                 return;
 486         }
 487         wil_dbg_txrx(wil, "%s()\n", __func__);
 488         while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
 489                 (*quota)--;
 490
 491                 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 492                         skb->dev = ndev;
 493                         skb_reset_mac_header(skb);
 494                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 495                         skb->pkt_type = PACKET_OTHERHOST;
 496                         skb->protocol = htons(ETH_P_802_2);
 497
 498                 } else {
 499                         skb->protocol = eth_type_trans(skb, ndev);
 500                 }
 501
 502                 wil_netif_rx_any(skb, ndev);
 503         }
 504         wil_rx_refill(wil, v->size);
 505 }
 506
 507 int wil_rx_init(struct wil6210_priv *wil)
 508 {
 509         struct vring *vring = &wil->vring_rx;
 510         int rc;
 511
 512         vring->size = WIL6210_RX_RING_SIZE;
 513         rc = wil_vring_alloc(wil, vring);
 514         if (rc)
 515                 return rc;
 516
 517         rc = wmi_rx_chain_add(wil, vring);
 518         if (rc)
 519                 goto err_free;
 520
 521         rc = wil_rx_refill(wil, vring->size);
 522         if (rc)
 523                 goto err_free;
 524
 525         return 0;
 526  err_free:
 527         wil_vring_free(wil, vring, 0);
 528
 529         return rc;
 530 }
 531
 532 void wil_rx_fini(struct wil6210_priv *wil)
 533 {
 534         struct vring *vring = &wil->vring_rx;
 535
 536         if (vring->va)
 537                 wil_vring_free(wil, vring, 0);
 538 }
 539
 540 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
 541                       int cid, int tid)
 542 {
 543         int rc;
 544         struct wmi_vring_cfg_cmd cmd = {
 545                 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
 546                 .vring_cfg = {
 547                         .tx_sw_ring = {
 548                                 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
 549                                 .ring_size = cpu_to_le16(size),
 550                         },
 551                         .ringid = id,
 552                         .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4),
 553                         .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
 554                         .mac_ctrl = 0,
 555                         .to_resolution = 0,
 556                         .agg_max_wsize = 16,
 557                         .schd_params = {
 558                                 .priority = cpu_to_le16(0),
 559                                 .timeslot_us = cpu_to_le16(0xfff),
 560                         },
 561                 },
 562         };
 563         struct {
 564                 struct wil6210_mbox_hdr_wmi wmi;
 565                 struct wmi_vring_cfg_done_event cmd;
 566         } __packed reply;
 567         struct vring *vring = &wil->vring_tx[id];
 568
 569         if (vring->va) {
 570                 wil_err(wil, "Tx ring [%d] already allocated\n", id);
 571                 rc = -EINVAL;
 572                 goto out;
 573         }
 574
 575         vring->size = size;
 576         rc = wil_vring_alloc(wil, vring);
 577         if (rc)
 578                 goto out;
 579
 580         cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
 581
 582         rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
 583                       WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
 584         if (rc)
 585                 goto out_free;
 586
 587         if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
 588                 wil_err(wil, "Tx config failed, status 0x%02x\n",
 589                         reply.cmd.status);
 590                 rc = -EINVAL;
 591                 goto out_free;
 592         }
 593         vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
 594
 595         return 0;
 596  out_free:
 597         wil_vring_free(wil, vring, 1);
 598  out:
 599
 600         return rc;
 601 }
 602
 603 void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
 604 {
 605         struct vring *vring = &wil->vring_tx[id];
 606
 607         if (!vring->va)
 608                 return;
 609
 610         wil_vring_free(wil, vring, 1);
 611 }
 612
 613 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
 614                                        struct sk_buff *skb)
 615 {
 616         struct vring *v = &wil->vring_tx[0];
 617
 618         if (v->va)
 619                 return v;
 620
 621         return NULL;
 622 }
 623
 624 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len)
 625 {
 626         wil_desc_addr_set(&d->dma.addr, pa);
 627         d->dma.ip_length = 0;
 628         /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
 629         d->dma.b11 = 0/*14 | BIT(7)*/;
 630         d->dma.error = 0;
 631         d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
 632         d->dma.length = cpu_to_le16((u16)len);
 633         d->dma.d0 = 0;
 634         d->mac.d[0] = 0;
 635         d->mac.d[1] = 0;
 636         d->mac.d[2] = 0;
 637         d->mac.ucode_cmd = 0;
 638         /* use dst index 0 */
 639         d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
 640                        (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
 641         /* translation type:  0 - bypass; 1 - 802.3; 2 - native wifi */
 642         d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
 643                       (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
 644
 645         return 0;
 646 }
 647
 648 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
 649                         struct sk_buff *skb)
 650 {
 651         struct device *dev = wil_to_dev(wil);
 652         struct vring_tx_desc dd, *d = &dd;
 653         volatile struct vring_tx_desc *_d;
 654         u32 swhead = vring->swhead;
 655         int avail = wil_vring_avail_tx(vring);
 656         int nr_frags = skb_shinfo(skb)->nr_frags;
 657         uint f;
 658         int vring_index = vring - wil->vring_tx;
 659         uint i = swhead;
 660         dma_addr_t pa;
 661
 662         wil_dbg_txrx(wil, "%s()\n", __func__);
 663
 664         if (avail < vring->size/8)
 665                 netif_tx_stop_all_queues(wil_to_ndev(wil));
 666         if (avail < 1 + nr_frags) {
 667                 wil_err(wil, "Tx ring full. No space for %d fragments\n",
 668                         1 + nr_frags);
 669                 return -ENOMEM;
 670         }
 671         _d = &(vring->va[i].tx);
 672
 673         /* FIXME FW can accept only unicast frames for the peer */
 674         memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN);
 675
 676         pa = dma_map_single(dev, skb->data,
 677                         skb_headlen(skb), DMA_TO_DEVICE);
 678
 679         wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
 680                      skb->data, (unsigned long long)pa);
 681         wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
 682                           skb->data, skb_headlen(skb), false);
 683
 684         if (unlikely(dma_mapping_error(dev, pa)))
 685                 return -EINVAL;
 686         /* 1-st segment */
 687         wil_tx_desc_map(d, pa, skb_headlen(skb));
 688         d->mac.d[2] |= ((nr_frags + 1) <<
 689                        MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
 690         if (nr_frags)
 691                 *_d = *d;
 692
 693         /* middle segments */
 694         for (f = 0; f < nr_frags; f++) {
 695                 const struct skb_frag_struct *frag =
 696                                 &skb_shinfo(skb)->frags[f];
 697                 int len = skb_frag_size(frag);
 698                 i = (swhead + f + 1) % vring->size;
 699                 _d = &(vring->va[i].tx);
 700                 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
 701                                 DMA_TO_DEVICE);
 702                 if (unlikely(dma_mapping_error(dev, pa)))
 703                         goto dma_error;
 704                 wil_tx_desc_map(d, pa, len);
 705                 vring->ctx[i] = NULL;
 706                 *_d = *d;
 707         }
 708         /* for the last seg only */
 709         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
 710         d->dma.d0 |= BIT(9); /* BUG: undocumented bit */
 711         d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
 712         d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
 713         *_d = *d;
 714
 715         wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
 716                           (const void *)d, sizeof(*d), false);
 717
 718         /* advance swhead */
 719         wil_vring_advance_head(vring, nr_frags + 1);
 720         wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
 721         trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
 722         iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
 723         /* hold reference to skb
 724          * to prevent skb release before accounting
 725          * in case of immediate "tx done"
 726          */
 727         vring->ctx[i] = skb_get(skb);
 728
 729         return 0;
 730  dma_error:
 731         /* unmap what we have mapped */
 732         /* Note: increment @f to operate with positive index */
 733         for (f++; f > 0; f--) {
 734                 u16 dmalen;
 735
 736                 i = (swhead + f) % vring->size;
 737                 _d = &(vring->va[i].tx);
 738                 *d = *_d;
 739                 _d->dma.status = TX_DMA_STATUS_DU;
 740                 pa = wil_desc_addr(&d->dma.addr);
 741                 dmalen = le16_to_cpu(d->dma.length);
 742                 if (vring->ctx[i])
 743                         dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
 744                 else
 745                         dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
 746         }
 747
 748         return -EINVAL;
 749 }
 750
 751
 752 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 753 {
 754         struct wil6210_priv *wil = ndev_to_wil(ndev);
 755         struct vring *vring;
 756         int rc;
 757
 758         wil_dbg_txrx(wil, "%s()\n", __func__);
 759         if (!test_bit(wil_status_fwready, &wil->status)) {
 760                 wil_err(wil, "FW not ready\n");
 761                 goto drop;
 762         }
 763         if (!test_bit(wil_status_fwconnected, &wil->status)) {
 764                 wil_err(wil, "FW not connected\n");
 765                 goto drop;
 766         }
 767         if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
 768                 wil_err(wil, "Xmit in monitor mode not supported\n");
 769                 goto drop;
 770         }
 771
 772         /* find vring */
 773         vring = wil_find_tx_vring(wil, skb);
 774         if (!vring) {
 775                 wil_err(wil, "No Tx VRING available\n");
 776                 goto drop;
 777         }
 778         /* set up vring entry */
 779         rc = wil_tx_vring(wil, vring, skb);
 780
 781         switch (rc) {
 782         case 0:
 783                 /* statistics will be updated on the tx_complete */
 784                 dev_kfree_skb_any(skb);
 785                 return NETDEV_TX_OK;
 786         case -ENOMEM:
 787                 return NETDEV_TX_BUSY;
 788         default:
 789                 break; /* goto drop; */
 790         }
 791  drop:
 792         ndev->stats.tx_dropped++;
 793         dev_kfree_skb_any(skb);
 794
 795         return NET_XMIT_DROP;
 796 }
 797
 798 /**
 799  * Clean up transmitted skb's from the Tx VRING
 800  *
 801  * Return number of descriptors cleared
 802  *
 803  * Safe to call from IRQ
 804  */
 805 int wil_tx_complete(struct wil6210_priv *wil, int ringid)
 806 {
 807         struct net_device *ndev = wil_to_ndev(wil);
 808         struct device *dev = wil_to_dev(wil);
 809         struct vring *vring = &wil->vring_tx[ringid];
 810         int done = 0;
 811
 812         if (!vring->va) {
 813                 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
 814                 return 0;
 815         }
 816
 817         wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
 818
 819         while (!wil_vring_is_empty(vring)) {
 820                 volatile struct vring_tx_desc *_d =
 821                                               &vring->va[vring->swtail].tx;
 822                 struct vring_tx_desc dd, *d = &dd;
 823                 dma_addr_t pa;
 824                 struct sk_buff *skb;
 825                 u16 dmalen;
 826
 827                 *d = *_d;
 828
 829                 if (!(d->dma.status & TX_DMA_STATUS_DU))
 830                         break;
 831
 832                 dmalen = le16_to_cpu(d->dma.length);
 833                 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
 834                                       d->dma.error);
 835                 wil_dbg_txrx(wil,
 836                              "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
 837                              vring->swtail, dmalen, d->dma.status,
 838                              d->dma.error);
 839                 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
 840                                   (const void *)d, sizeof(*d), false);
 841
 842                 pa = wil_desc_addr(&d->dma.addr);
 843                 skb = vring->ctx[vring->swtail];
 844                 if (skb) {
 845                         if (d->dma.error == 0) {
 846                                 ndev->stats.tx_packets++;
 847                                 ndev->stats.tx_bytes += skb->len;
 848                         } else {
 849                                 ndev->stats.tx_errors++;
 850                         }
 851
 852                         dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
 853                         dev_kfree_skb_any(skb);
 854                         vring->ctx[vring->swtail] = NULL;
 855                 } else {
 856                         dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
 857                 }
 858                 d->dma.addr.addr_low = 0;
 859                 d->dma.addr.addr_high = 0;
 860                 d->dma.length = 0;
 861                 d->dma.status = TX_DMA_STATUS_DU;
 862                 vring->swtail = wil_vring_next_tail(vring);
 863                 done++;
 864         }
 865         if (wil_vring_avail_tx(vring) > vring->size/4)
 866                 netif_tx_wake_all_queues(wil_to_ndev(wil));
 867
 868         return done;
 869 }