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

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