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 26 static bool rtap_include_phy_info; 27 module_param(rtap_include_phy_info, bool, S_IRUGO); 28 MODULE_PARM_DESC(rtap_include_phy_info, 29 " Include PHY info in the radiotap header, default - no"); 30 31 static inline int wil_vring_is_empty(struct vring *vring) 32 { 33 return vring->swhead == vring->swtail; 34 } 35 36 static inline u32 wil_vring_next_tail(struct vring *vring) 37 { 38 return (vring->swtail + 1) % vring->size; 39 } 40 41 static inline void wil_vring_advance_head(struct vring *vring, int n) 42 { 43 vring->swhead = (vring->swhead + n) % vring->size; 44 } 45 46 static inline int wil_vring_is_full(struct vring *vring) 47 { 48 return wil_vring_next_tail(vring) == vring->swhead; 49 } 50 /* 51 * Available space in Tx Vring 52 */ 53 static inline int wil_vring_avail_tx(struct vring *vring) 54 { 55 u32 swhead = vring->swhead; 56 u32 swtail = vring->swtail; 57 int used = (vring->size + swhead - swtail) % vring->size; 58 59 return vring->size - used - 1; 60 } 61 62 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring) 63 { 64 struct device *dev = wil_to_dev(wil); 65 size_t sz = vring->size * sizeof(vring->va[0]); 66 uint i; 67 68 BUILD_BUG_ON(sizeof(vring->va[0]) != 32); 69 70 vring->swhead = 0; 71 vring->swtail = 0; 72 vring->ctx = kzalloc(vring->size * sizeof(vring->ctx[0]), GFP_KERNEL); 73 if (!vring->ctx) { 74 vring->va = NULL; 75 return -ENOMEM; 76 } 77 /* 78 * vring->va should be aligned on its size rounded up to power of 2 79 * This is granted by the dma_alloc_coherent 80 */ 81 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL); 82 if (!vring->va) { 83 kfree(vring->ctx); 84 vring->ctx = NULL; 85 return -ENOMEM; 86 } 87 /* initially, all descriptors are SW owned 88 * For Tx and Rx, ownership bit is at the same location, thus 89 * we can use any 90 */ 91 for (i = 0; i < vring->size; i++) { 92 volatile struct vring_tx_desc *d = &(vring->va[i].tx); 93 d->dma.status = TX_DMA_STATUS_DU; 94 } 95 96 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size, 97 vring->va, (unsigned long long)vring->pa, vring->ctx); 98 99 return 0; 100 } 101 102 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring, 103 int tx) 104 { 105 struct device *dev = wil_to_dev(wil); 106 size_t sz = vring->size * sizeof(vring->va[0]); 107 108 while (!wil_vring_is_empty(vring)) { 109 if (tx) { 110 volatile struct vring_tx_desc *d = 111 &vring->va[vring->swtail].tx; 112 dma_addr_t pa = d->dma.addr_low | 113 ((u64)d->dma.addr_high << 32); 114 struct sk_buff *skb = vring->ctx[vring->swtail]; 115 if (skb) { 116 dma_unmap_single(dev, pa, d->dma.length, 117 DMA_TO_DEVICE); 118 dev_kfree_skb_any(skb); 119 vring->ctx[vring->swtail] = NULL; 120 } else { 121 dma_unmap_page(dev, pa, d->dma.length, 122 DMA_TO_DEVICE); 123 } 124 vring->swtail = wil_vring_next_tail(vring); 125 } else { /* rx */ 126 volatile struct vring_rx_desc *d = 127 &vring->va[vring->swtail].rx; 128 dma_addr_t pa = d->dma.addr_low | 129 ((u64)d->dma.addr_high << 32); 130 struct sk_buff *skb = vring->ctx[vring->swhead]; 131 dma_unmap_single(dev, pa, d->dma.length, 132 DMA_FROM_DEVICE); 133 kfree_skb(skb); 134 wil_vring_advance_head(vring, 1); 135 } 136 } 137 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa); 138 kfree(vring->ctx); 139 vring->pa = 0; 140 vring->va = NULL; 141 vring->ctx = NULL; 142 } 143 144 /** 145 * Allocate one skb for Rx VRING 146 * 147 * Safe to call from IRQ 148 */ 149 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring, 150 u32 i, int headroom) 151 { 152 struct device *dev = wil_to_dev(wil); 153 unsigned int sz = RX_BUF_LEN; 154 volatile struct vring_rx_desc *d = &(vring->va[i].rx); 155 dma_addr_t pa; 156 157 /* TODO align */ 158 struct sk_buff *skb = dev_alloc_skb(sz + headroom); 159 if (unlikely(!skb)) 160 return -ENOMEM; 161 162 skb_reserve(skb, headroom); 163 skb_put(skb, sz); 164 165 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE); 166 if (unlikely(dma_mapping_error(dev, pa))) { 167 kfree_skb(skb); 168 return -ENOMEM; 169 } 170 171 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT; 172 d->dma.addr_low = lower_32_bits(pa); 173 d->dma.addr_high = (u16)upper_32_bits(pa); 174 /* ip_length don't care */ 175 /* b11 don't care */ 176 /* error don't care */ 177 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 178 d->dma.length = sz; 179 vring->ctx[i] = skb; 180 181 return 0; 182 } 183 184 /** 185 * Adds radiotap header 186 * 187 * Any error indicated as "Bad FCS" 188 * 189 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of: 190 * - Rx descriptor: 32 bytes 191 * - Phy info 192 */ 193 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil, 194 struct sk_buff *skb) 195 { 196 struct wireless_dev *wdev = wil->wdev; 197 struct wil6210_rtap { 198 struct ieee80211_radiotap_header rthdr; 199 /* fields should be in the order of bits in rthdr.it_present */ 200 /* flags */ 201 u8 flags; 202 /* channel */ 203 __le16 chnl_freq __aligned(2); 204 __le16 chnl_flags; 205 /* MCS */ 206 u8 mcs_present; 207 u8 mcs_flags; 208 u8 mcs_index; 209 } __packed; 210 struct wil6210_rtap_vendor { 211 struct wil6210_rtap rtap; 212 /* vendor */ 213 u8 vendor_oui[3] __aligned(2); 214 u8 vendor_ns; 215 __le16 vendor_skip; 216 u8 vendor_data[0]; 217 } __packed; 218 struct vring_rx_desc *d = wil_skb_rxdesc(skb); 219 struct wil6210_rtap_vendor *rtap_vendor; 220 int rtap_len = sizeof(struct wil6210_rtap); 221 int phy_length = 0; /* phy info header size, bytes */ 222 static char phy_data[128]; 223 struct ieee80211_channel *ch = wdev->preset_chandef.chan; 224 225 if (rtap_include_phy_info) { 226 rtap_len = sizeof(*rtap_vendor) + sizeof(*d); 227 /* calculate additional length */ 228 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) { 229 /** 230 * PHY info starts from 8-byte boundary 231 * there are 8-byte lines, last line may be partially 232 * written (HW bug), thus FW configures for last line 233 * to be excessive. Driver skips this last line. 234 */ 235 int len = min_t(int, 8 + sizeof(phy_data), 236 wil_rxdesc_phy_length(d)); 237 if (len > 8) { 238 void *p = skb_tail_pointer(skb); 239 void *pa = PTR_ALIGN(p, 8); 240 if (skb_tailroom(skb) >= len + (pa - p)) { 241 phy_length = len - 8; 242 memcpy(phy_data, pa, phy_length); 243 } 244 } 245 } 246 rtap_len += phy_length; 247 } 248 249 if (skb_headroom(skb) < rtap_len && 250 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) { 251 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len); 252 return; 253 } 254 255 rtap_vendor = (void *)skb_push(skb, rtap_len); 256 memset(rtap_vendor, 0, rtap_len); 257 258 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION; 259 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len); 260 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32( 261 (1 << IEEE80211_RADIOTAP_FLAGS) | 262 (1 << IEEE80211_RADIOTAP_CHANNEL) | 263 (1 << IEEE80211_RADIOTAP_MCS)); 264 if (d->dma.status & RX_DMA_STATUS_ERROR) 265 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS; 266 267 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320); 268 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0); 269 270 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS; 271 rtap_vendor->rtap.mcs_flags = 0; 272 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d); 273 274 if (rtap_include_phy_info) { 275 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 << 276 IEEE80211_RADIOTAP_VENDOR_NAMESPACE); 277 /* OUI for Wilocity 04:ce:14 */ 278 rtap_vendor->vendor_oui[0] = 0x04; 279 rtap_vendor->vendor_oui[1] = 0xce; 280 rtap_vendor->vendor_oui[2] = 0x14; 281 rtap_vendor->vendor_ns = 1; 282 /* Rx descriptor + PHY data */ 283 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) + 284 phy_length); 285 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d)); 286 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data, 287 phy_length); 288 } 289 } 290 291 /* 292 * Fast swap in place between 2 registers 293 */ 294 static void wil_swap_u16(u16 *a, u16 *b) 295 { 296 *a ^= *b; 297 *b ^= *a; 298 *a ^= *b; 299 } 300 301 static void wil_swap_ethaddr(void *data) 302 { 303 struct ethhdr *eth = data; 304 u16 *s = (u16 *)eth->h_source; 305 u16 *d = (u16 *)eth->h_dest; 306 307 wil_swap_u16(s++, d++); 308 wil_swap_u16(s++, d++); 309 wil_swap_u16(s, d); 310 } 311 312 /** 313 * reap 1 frame from @swhead 314 * 315 * Rx descriptor copied to skb->cb 316 * 317 * Safe to call from IRQ 318 */ 319 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, 320 struct vring *vring) 321 { 322 struct device *dev = wil_to_dev(wil); 323 struct net_device *ndev = wil_to_ndev(wil); 324 volatile struct vring_rx_desc *d; 325 struct vring_rx_desc *d1; 326 struct sk_buff *skb; 327 dma_addr_t pa; 328 unsigned int sz = RX_BUF_LEN; 329 u8 ftype; 330 u8 ds_bits; 331 332 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb)); 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 d1 = wil_skb_rxdesc(skb); 349 *d1 = *d; 350 351 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d1); 352 353 /* use radiotap header only if required */ 354 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP) 355 wil_rx_add_radiotap_header(wil, skb); 356 357 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length); 358 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4, 359 (const void *)d, sizeof(*d), false); 360 361 wil_vring_advance_head(vring, 1); 362 363 /* no extra checks if in sniffer mode */ 364 if (ndev->type != ARPHRD_ETHER) 365 return skb; 366 /* 367 * Non-data frames may be delivered through Rx DMA channel (ex: BAR) 368 * Driver should recognize it by frame type, that is found 369 * in Rx descriptor. If type is not data, it is 802.11 frame as is 370 */ 371 ftype = wil_rxdesc_ftype(d1) << 2; 372 if (ftype != IEEE80211_FTYPE_DATA) { 373 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype); 374 /* TODO: process it */ 375 kfree_skb(skb); 376 return NULL; 377 } 378 379 if (skb->len < ETH_HLEN) { 380 wil_err(wil, "Short frame, len = %d\n", skb->len); 381 /* TODO: process it (i.e. BAR) */ 382 kfree_skb(skb); 383 return NULL; 384 } 385 386 ds_bits = wil_rxdesc_ds_bits(d1); 387 if (ds_bits == 1) { 388 /* 389 * HW bug - in ToDS mode, i.e. Rx on AP side, 390 * addresses get swapped 391 */ 392 wil_swap_ethaddr(skb->data); 393 } 394 395 return skb; 396 } 397 398 /** 399 * allocate and fill up to @count buffers in rx ring 400 * buffers posted at @swtail 401 */ 402 static int wil_rx_refill(struct wil6210_priv *wil, int count) 403 { 404 struct net_device *ndev = wil_to_ndev(wil); 405 struct vring *v = &wil->vring_rx; 406 u32 next_tail; 407 int rc = 0; 408 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ? 409 WIL6210_RTAP_SIZE : 0; 410 411 for (; next_tail = wil_vring_next_tail(v), 412 (next_tail != v->swhead) && (count-- > 0); 413 v->swtail = next_tail) { 414 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom); 415 if (rc) { 416 wil_err(wil, "Error %d in wil_rx_refill[%d]\n", 417 rc, v->swtail); 418 break; 419 } 420 } 421 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail)); 422 423 return rc; 424 } 425 426 /* 427 * Pass Rx packet to the netif. Update statistics. 428 */ 429 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev) 430 { 431 int rc; 432 unsigned int len = skb->len; 433 434 skb_orphan(skb); 435 436 if (in_interrupt()) 437 rc = netif_rx(skb); 438 else 439 rc = netif_rx_ni(skb); 440 441 if (likely(rc == NET_RX_SUCCESS)) { 442 ndev->stats.rx_packets++; 443 ndev->stats.rx_bytes += len; 444 445 } else { 446 ndev->stats.rx_dropped++; 447 } 448 } 449 450 /** 451 * Proceed all completed skb's from Rx VRING 452 * 453 * Safe to call from IRQ 454 */ 455 void wil_rx_handle(struct wil6210_priv *wil) 456 { 457 struct net_device *ndev = wil_to_ndev(wil); 458 struct vring *v = &wil->vring_rx; 459 struct sk_buff *skb; 460 461 if (!v->va) { 462 wil_err(wil, "Rx IRQ while Rx not yet initialized\n"); 463 return; 464 } 465 wil_dbg_txrx(wil, "%s()\n", __func__); 466 while (NULL != (skb = wil_vring_reap_rx(wil, v))) { 467 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1, 468 skb->data, skb_headlen(skb), false); 469 470 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { 471 skb->dev = ndev; 472 skb_reset_mac_header(skb); 473 skb->ip_summed = CHECKSUM_UNNECESSARY; 474 skb->pkt_type = PACKET_OTHERHOST; 475 skb->protocol = htons(ETH_P_802_2); 476 477 } else { 478 skb->protocol = eth_type_trans(skb, ndev); 479 } 480 481 wil_netif_rx_any(skb, ndev); 482 } 483 wil_rx_refill(wil, v->size); 484 } 485 486 int wil_rx_init(struct wil6210_priv *wil) 487 { 488 struct vring *vring = &wil->vring_rx; 489 int rc; 490 491 vring->size = WIL6210_RX_RING_SIZE; 492 rc = wil_vring_alloc(wil, vring); 493 if (rc) 494 return rc; 495 496 rc = wmi_rx_chain_add(wil, vring); 497 if (rc) 498 goto err_free; 499 500 rc = wil_rx_refill(wil, vring->size); 501 if (rc) 502 goto err_free; 503 504 return 0; 505 err_free: 506 wil_vring_free(wil, vring, 0); 507 508 return rc; 509 } 510 511 void wil_rx_fini(struct wil6210_priv *wil) 512 { 513 struct vring *vring = &wil->vring_rx; 514 515 if (vring->va) 516 wil_vring_free(wil, vring, 0); 517 } 518 519 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size, 520 int cid, int tid) 521 { 522 int rc; 523 struct wmi_vring_cfg_cmd cmd = { 524 .action = cpu_to_le32(WMI_VRING_CMD_ADD), 525 .vring_cfg = { 526 .tx_sw_ring = { 527 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN), 528 .ring_size = cpu_to_le16(size), 529 }, 530 .ringid = id, 531 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4), 532 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, 533 .mac_ctrl = 0, 534 .to_resolution = 0, 535 .agg_max_wsize = 16, 536 .schd_params = { 537 .priority = cpu_to_le16(0), 538 .timeslot_us = cpu_to_le16(0xfff), 539 }, 540 }, 541 }; 542 struct { 543 struct wil6210_mbox_hdr_wmi wmi; 544 struct wmi_vring_cfg_done_event cmd; 545 } __packed reply; 546 struct vring *vring = &wil->vring_tx[id]; 547 548 if (vring->va) { 549 wil_err(wil, "Tx ring [%d] already allocated\n", id); 550 rc = -EINVAL; 551 goto out; 552 } 553 554 vring->size = size; 555 rc = wil_vring_alloc(wil, vring); 556 if (rc) 557 goto out; 558 559 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); 560 561 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd), 562 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100); 563 if (rc) 564 goto out_free; 565 566 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) { 567 wil_err(wil, "Tx config failed, status 0x%02x\n", 568 reply.cmd.status); 569 rc = -EINVAL; 570 goto out_free; 571 } 572 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr); 573 574 return 0; 575 out_free: 576 wil_vring_free(wil, vring, 1); 577 out: 578 579 return rc; 580 } 581 582 void wil_vring_fini_tx(struct wil6210_priv *wil, int id) 583 { 584 struct vring *vring = &wil->vring_tx[id]; 585 586 if (!vring->va) 587 return; 588 589 wil_vring_free(wil, vring, 1); 590 } 591 592 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil, 593 struct sk_buff *skb) 594 { 595 struct vring *v = &wil->vring_tx[0]; 596 597 if (v->va) 598 return v; 599 600 return NULL; 601 } 602 603 static int wil_tx_desc_map(volatile struct vring_tx_desc *d, 604 dma_addr_t pa, u32 len) 605 { 606 d->dma.addr_low = lower_32_bits(pa); 607 d->dma.addr_high = (u16)upper_32_bits(pa); 608 d->dma.ip_length = 0; 609 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/ 610 d->dma.b11 = 0/*14 | BIT(7)*/; 611 d->dma.error = 0; 612 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 613 d->dma.length = len; 614 d->dma.d0 = 0; 615 d->mac.d[0] = 0; 616 d->mac.d[1] = 0; 617 d->mac.d[2] = 0; 618 d->mac.ucode_cmd = 0; 619 /* use dst index 0 */ 620 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) | 621 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS); 622 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */ 623 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) | 624 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS); 625 626 return 0; 627 } 628 629 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, 630 struct sk_buff *skb) 631 { 632 struct device *dev = wil_to_dev(wil); 633 volatile struct vring_tx_desc *d; 634 u32 swhead = vring->swhead; 635 int avail = wil_vring_avail_tx(vring); 636 int nr_frags = skb_shinfo(skb)->nr_frags; 637 uint f; 638 int vring_index = vring - wil->vring_tx; 639 uint i = swhead; 640 dma_addr_t pa; 641 642 wil_dbg_txrx(wil, "%s()\n", __func__); 643 644 if (avail < vring->size/8) 645 netif_tx_stop_all_queues(wil_to_ndev(wil)); 646 if (avail < 1 + nr_frags) { 647 wil_err(wil, "Tx ring full. No space for %d fragments\n", 648 1 + nr_frags); 649 return -ENOMEM; 650 } 651 d = &(vring->va[i].tx); 652 653 /* FIXME FW can accept only unicast frames for the peer */ 654 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN); 655 656 pa = dma_map_single(dev, skb->data, 657 skb_headlen(skb), DMA_TO_DEVICE); 658 659 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb), 660 skb->data, (unsigned long long)pa); 661 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1, 662 skb->data, skb_headlen(skb), false); 663 664 if (unlikely(dma_mapping_error(dev, pa))) 665 return -EINVAL; 666 /* 1-st segment */ 667 wil_tx_desc_map(d, pa, skb_headlen(skb)); 668 d->mac.d[2] |= ((nr_frags + 1) << 669 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS); 670 /* middle segments */ 671 for (f = 0; f < nr_frags; f++) { 672 const struct skb_frag_struct *frag = 673 &skb_shinfo(skb)->frags[f]; 674 int len = skb_frag_size(frag); 675 i = (swhead + f + 1) % vring->size; 676 d = &(vring->va[i].tx); 677 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag), 678 DMA_TO_DEVICE); 679 if (unlikely(dma_mapping_error(dev, pa))) 680 goto dma_error; 681 wil_tx_desc_map(d, pa, len); 682 vring->ctx[i] = NULL; 683 } 684 /* for the last seg only */ 685 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS); 686 d->dma.d0 |= BIT(9); /* BUG: undocumented bit */ 687 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS); 688 d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS); 689 690 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4, 691 (const void *)d, sizeof(*d), false); 692 693 /* advance swhead */ 694 wil_vring_advance_head(vring, nr_frags + 1); 695 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead); 696 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail)); 697 /* hold reference to skb 698 * to prevent skb release before accounting 699 * in case of immediate "tx done" 700 */ 701 vring->ctx[i] = skb_get(skb); 702 703 return 0; 704 dma_error: 705 /* unmap what we have mapped */ 706 /* Note: increment @f to operate with positive index */ 707 for (f++; f > 0; f--) { 708 i = (swhead + f) % vring->size; 709 d = &(vring->va[i].tx); 710 d->dma.status = TX_DMA_STATUS_DU; 711 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); 712 if (vring->ctx[i]) 713 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE); 714 else 715 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE); 716 } 717 718 return -EINVAL; 719 } 720 721 722 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev) 723 { 724 struct wil6210_priv *wil = ndev_to_wil(ndev); 725 struct vring *vring; 726 int rc; 727 728 wil_dbg_txrx(wil, "%s()\n", __func__); 729 if (!test_bit(wil_status_fwready, &wil->status)) { 730 wil_err(wil, "FW not ready\n"); 731 goto drop; 732 } 733 if (!test_bit(wil_status_fwconnected, &wil->status)) { 734 wil_err(wil, "FW not connected\n"); 735 goto drop; 736 } 737 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { 738 wil_err(wil, "Xmit in monitor mode not supported\n"); 739 goto drop; 740 } 741 if (skb->protocol == cpu_to_be16(ETH_P_PAE)) { 742 rc = wmi_tx_eapol(wil, skb); 743 } else { 744 /* find vring */ 745 vring = wil_find_tx_vring(wil, skb); 746 if (!vring) { 747 wil_err(wil, "No Tx VRING available\n"); 748 goto drop; 749 } 750 /* set up vring entry */ 751 rc = wil_tx_vring(wil, vring, skb); 752 } 753 switch (rc) { 754 case 0: 755 /* statistics will be updated on the tx_complete */ 756 dev_kfree_skb_any(skb); 757 return NETDEV_TX_OK; 758 case -ENOMEM: 759 return NETDEV_TX_BUSY; 760 default: 761 break; /* goto drop; */ 762 } 763 drop: 764 netif_tx_stop_all_queues(ndev); 765 ndev->stats.tx_dropped++; 766 dev_kfree_skb_any(skb); 767 768 return NET_XMIT_DROP; 769 } 770 771 /** 772 * Clean up transmitted skb's from the Tx VRING 773 * 774 * Safe to call from IRQ 775 */ 776 void wil_tx_complete(struct wil6210_priv *wil, int ringid) 777 { 778 struct net_device *ndev = wil_to_ndev(wil); 779 struct device *dev = wil_to_dev(wil); 780 struct vring *vring = &wil->vring_tx[ringid]; 781 782 if (!vring->va) { 783 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid); 784 return; 785 } 786 787 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid); 788 789 while (!wil_vring_is_empty(vring)) { 790 volatile struct vring_tx_desc *d1 = 791 &vring->va[vring->swtail].tx; 792 struct vring_tx_desc dd, *d = ⅆ 793 dma_addr_t pa; 794 struct sk_buff *skb; 795 796 dd = *d1; 797 798 if (!(d->dma.status & TX_DMA_STATUS_DU)) 799 break; 800 801 wil_dbg_txrx(wil, 802 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n", 803 vring->swtail, d->dma.length, d->dma.status, 804 d->dma.error); 805 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4, 806 (const void *)d, sizeof(*d), false); 807 808 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); 809 skb = vring->ctx[vring->swtail]; 810 if (skb) { 811 if (d->dma.error == 0) { 812 ndev->stats.tx_packets++; 813 ndev->stats.tx_bytes += skb->len; 814 } else { 815 ndev->stats.tx_errors++; 816 } 817 818 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE); 819 dev_kfree_skb_any(skb); 820 vring->ctx[vring->swtail] = NULL; 821 } else { 822 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE); 823 } 824 d->dma.addr_low = 0; 825 d->dma.addr_high = 0; 826 d->dma.length = 0; 827 d->dma.status = TX_DMA_STATUS_DU; 828 vring->swtail = wil_vring_next_tail(vring); 829 } 830 if (wil_vring_avail_tx(vring) > vring->size/4) 831 netif_tx_wake_all_queues(wil_to_ndev(wil)); 832 } 833