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 = ⅆ 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 = ⅆ 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 = ⅆ 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 int vring_index) 626 { 627 wil_desc_addr_set(&d->dma.addr, pa); 628 d->dma.ip_length = 0; 629 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/ 630 d->dma.b11 = 0/*14 | BIT(7)*/; 631 d->dma.error = 0; 632 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 633 d->dma.length = cpu_to_le16((u16)len); 634 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS); 635 d->mac.d[0] = 0; 636 d->mac.d[1] = 0; 637 d->mac.d[2] = 0; 638 d->mac.ucode_cmd = 0; 639 /* use dst index 0 */ 640 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) | 641 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS); 642 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */ 643 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) | 644 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS); 645 646 return 0; 647 } 648 649 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, 650 struct sk_buff *skb) 651 { 652 struct device *dev = wil_to_dev(wil); 653 struct vring_tx_desc dd, *d = ⅆ 654 volatile struct vring_tx_desc *_d; 655 u32 swhead = vring->swhead; 656 int avail = wil_vring_avail_tx(vring); 657 int nr_frags = skb_shinfo(skb)->nr_frags; 658 uint f; 659 int vring_index = vring - wil->vring_tx; 660 uint i = swhead; 661 dma_addr_t pa; 662 663 wil_dbg_txrx(wil, "%s()\n", __func__); 664 665 if (avail < vring->size/8) 666 netif_tx_stop_all_queues(wil_to_ndev(wil)); 667 if (avail < 1 + nr_frags) { 668 wil_err(wil, "Tx ring full. No space for %d fragments\n", 669 1 + nr_frags); 670 return -ENOMEM; 671 } 672 _d = &(vring->va[i].tx); 673 674 /* FIXME FW can accept only unicast frames for the peer */ 675 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN); 676 677 pa = dma_map_single(dev, skb->data, 678 skb_headlen(skb), DMA_TO_DEVICE); 679 680 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb), 681 skb->data, (unsigned long long)pa); 682 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1, 683 skb->data, skb_headlen(skb), false); 684 685 if (unlikely(dma_mapping_error(dev, pa))) 686 return -EINVAL; 687 /* 1-st segment */ 688 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index); 689 d->mac.d[2] |= ((nr_frags + 1) << 690 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS); 691 if (nr_frags) 692 *_d = *d; 693 694 /* middle segments */ 695 for (f = 0; f < nr_frags; f++) { 696 const struct skb_frag_struct *frag = 697 &skb_shinfo(skb)->frags[f]; 698 int len = skb_frag_size(frag); 699 i = (swhead + f + 1) % vring->size; 700 _d = &(vring->va[i].tx); 701 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag), 702 DMA_TO_DEVICE); 703 if (unlikely(dma_mapping_error(dev, pa))) 704 goto dma_error; 705 wil_tx_desc_map(d, pa, len, vring_index); 706 vring->ctx[i] = NULL; 707 *_d = *d; 708 } 709 /* for the last seg only */ 710 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS); 711 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS); 712 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_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 = ⅆ 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 } 870