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 } 825