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 #include <linux/ip.h> 22 #include <linux/ipv6.h> 23 #include <net/ipv6.h> 24 25 #include "wil6210.h" 26 #include "wmi.h" 27 #include "txrx.h" 28 #include "trace.h" 29 30 static bool rtap_include_phy_info; 31 module_param(rtap_include_phy_info, bool, S_IRUGO); 32 MODULE_PARM_DESC(rtap_include_phy_info, 33 " Include PHY info in the radiotap header, default - no"); 34 35 static inline int wil_vring_is_empty(struct vring *vring) 36 { 37 return vring->swhead == vring->swtail; 38 } 39 40 static inline u32 wil_vring_next_tail(struct vring *vring) 41 { 42 return (vring->swtail + 1) % vring->size; 43 } 44 45 static inline void wil_vring_advance_head(struct vring *vring, int n) 46 { 47 vring->swhead = (vring->swhead + n) % vring->size; 48 } 49 50 static inline int wil_vring_is_full(struct vring *vring) 51 { 52 return wil_vring_next_tail(vring) == vring->swhead; 53 } 54 /* 55 * Available space in Tx Vring 56 */ 57 static inline int wil_vring_avail_tx(struct vring *vring) 58 { 59 u32 swhead = vring->swhead; 60 u32 swtail = vring->swtail; 61 int used = (vring->size + swhead - swtail) % vring->size; 62 63 return vring->size - used - 1; 64 } 65 66 static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring) 67 { 68 struct device *dev = wil_to_dev(wil); 69 size_t sz = vring->size * sizeof(vring->va[0]); 70 uint i; 71 72 BUILD_BUG_ON(sizeof(vring->va[0]) != 32); 73 74 vring->swhead = 0; 75 vring->swtail = 0; 76 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL); 77 if (!vring->ctx) { 78 vring->va = NULL; 79 return -ENOMEM; 80 } 81 /* 82 * vring->va should be aligned on its size rounded up to power of 2 83 * This is granted by the dma_alloc_coherent 84 */ 85 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL); 86 if (!vring->va) { 87 kfree(vring->ctx); 88 vring->ctx = NULL; 89 return -ENOMEM; 90 } 91 /* initially, all descriptors are SW owned 92 * For Tx and Rx, ownership bit is at the same location, thus 93 * we can use any 94 */ 95 for (i = 0; i < vring->size; i++) { 96 volatile struct vring_tx_desc *_d = &(vring->va[i].tx); 97 _d->dma.status = TX_DMA_STATUS_DU; 98 } 99 100 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size, 101 vring->va, (unsigned long long)vring->pa, vring->ctx); 102 103 return 0; 104 } 105 106 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring, 107 int tx) 108 { 109 struct device *dev = wil_to_dev(wil); 110 size_t sz = vring->size * sizeof(vring->va[0]); 111 112 while (!wil_vring_is_empty(vring)) { 113 dma_addr_t pa; 114 u16 dmalen; 115 struct wil_ctx *ctx; 116 117 if (tx) { 118 struct vring_tx_desc dd, *d = ⅆ 119 volatile struct vring_tx_desc *_d = 120 &vring->va[vring->swtail].tx; 121 122 ctx = &vring->ctx[vring->swtail]; 123 *d = *_d; 124 pa = wil_desc_addr(&d->dma.addr); 125 dmalen = le16_to_cpu(d->dma.length); 126 if (vring->ctx[vring->swtail].mapped_as_page) { 127 dma_unmap_page(dev, pa, dmalen, 128 DMA_TO_DEVICE); 129 } else { 130 dma_unmap_single(dev, pa, dmalen, 131 DMA_TO_DEVICE); 132 } 133 if (ctx->skb) 134 dev_kfree_skb_any(ctx->skb); 135 vring->swtail = wil_vring_next_tail(vring); 136 } else { /* rx */ 137 struct vring_rx_desc dd, *d = ⅆ 138 volatile struct vring_rx_desc *_d = 139 &vring->va[vring->swhead].rx; 140 141 ctx = &vring->ctx[vring->swhead]; 142 *d = *_d; 143 pa = wil_desc_addr(&d->dma.addr); 144 dmalen = le16_to_cpu(d->dma.length); 145 dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE); 146 kfree_skb(ctx->skb); 147 wil_vring_advance_head(vring, 1); 148 } 149 } 150 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa); 151 kfree(vring->ctx); 152 vring->pa = 0; 153 vring->va = NULL; 154 vring->ctx = NULL; 155 } 156 157 /** 158 * Allocate one skb for Rx VRING 159 * 160 * Safe to call from IRQ 161 */ 162 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring, 163 u32 i, int headroom) 164 { 165 struct device *dev = wil_to_dev(wil); 166 unsigned int sz = RX_BUF_LEN; 167 struct vring_rx_desc dd, *d = ⅆ 168 volatile struct vring_rx_desc *_d = &(vring->va[i].rx); 169 dma_addr_t pa; 170 171 /* TODO align */ 172 struct sk_buff *skb = dev_alloc_skb(sz + headroom); 173 if (unlikely(!skb)) 174 return -ENOMEM; 175 176 skb_reserve(skb, headroom); 177 skb_put(skb, sz); 178 179 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE); 180 if (unlikely(dma_mapping_error(dev, pa))) { 181 kfree_skb(skb); 182 return -ENOMEM; 183 } 184 185 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT; 186 wil_desc_addr_set(&d->dma.addr, pa); 187 /* ip_length don't care */ 188 /* b11 don't care */ 189 /* error don't care */ 190 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 191 d->dma.length = cpu_to_le16(sz); 192 *_d = *d; 193 vring->ctx[i].skb = skb; 194 195 return 0; 196 } 197 198 /** 199 * Adds radiotap header 200 * 201 * Any error indicated as "Bad FCS" 202 * 203 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of: 204 * - Rx descriptor: 32 bytes 205 * - Phy info 206 */ 207 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil, 208 struct sk_buff *skb) 209 { 210 struct wireless_dev *wdev = wil->wdev; 211 struct wil6210_rtap { 212 struct ieee80211_radiotap_header rthdr; 213 /* fields should be in the order of bits in rthdr.it_present */ 214 /* flags */ 215 u8 flags; 216 /* channel */ 217 __le16 chnl_freq __aligned(2); 218 __le16 chnl_flags; 219 /* MCS */ 220 u8 mcs_present; 221 u8 mcs_flags; 222 u8 mcs_index; 223 } __packed; 224 struct wil6210_rtap_vendor { 225 struct wil6210_rtap rtap; 226 /* vendor */ 227 u8 vendor_oui[3] __aligned(2); 228 u8 vendor_ns; 229 __le16 vendor_skip; 230 u8 vendor_data[0]; 231 } __packed; 232 struct vring_rx_desc *d = wil_skb_rxdesc(skb); 233 struct wil6210_rtap_vendor *rtap_vendor; 234 int rtap_len = sizeof(struct wil6210_rtap); 235 int phy_length = 0; /* phy info header size, bytes */ 236 static char phy_data[128]; 237 struct ieee80211_channel *ch = wdev->preset_chandef.chan; 238 239 if (rtap_include_phy_info) { 240 rtap_len = sizeof(*rtap_vendor) + sizeof(*d); 241 /* calculate additional length */ 242 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) { 243 /** 244 * PHY info starts from 8-byte boundary 245 * there are 8-byte lines, last line may be partially 246 * written (HW bug), thus FW configures for last line 247 * to be excessive. Driver skips this last line. 248 */ 249 int len = min_t(int, 8 + sizeof(phy_data), 250 wil_rxdesc_phy_length(d)); 251 if (len > 8) { 252 void *p = skb_tail_pointer(skb); 253 void *pa = PTR_ALIGN(p, 8); 254 if (skb_tailroom(skb) >= len + (pa - p)) { 255 phy_length = len - 8; 256 memcpy(phy_data, pa, phy_length); 257 } 258 } 259 } 260 rtap_len += phy_length; 261 } 262 263 if (skb_headroom(skb) < rtap_len && 264 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) { 265 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len); 266 return; 267 } 268 269 rtap_vendor = (void *)skb_push(skb, rtap_len); 270 memset(rtap_vendor, 0, rtap_len); 271 272 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION; 273 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len); 274 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32( 275 (1 << IEEE80211_RADIOTAP_FLAGS) | 276 (1 << IEEE80211_RADIOTAP_CHANNEL) | 277 (1 << IEEE80211_RADIOTAP_MCS)); 278 if (d->dma.status & RX_DMA_STATUS_ERROR) 279 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS; 280 281 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320); 282 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0); 283 284 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS; 285 rtap_vendor->rtap.mcs_flags = 0; 286 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d); 287 288 if (rtap_include_phy_info) { 289 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 << 290 IEEE80211_RADIOTAP_VENDOR_NAMESPACE); 291 /* OUI for Wilocity 04:ce:14 */ 292 rtap_vendor->vendor_oui[0] = 0x04; 293 rtap_vendor->vendor_oui[1] = 0xce; 294 rtap_vendor->vendor_oui[2] = 0x14; 295 rtap_vendor->vendor_ns = 1; 296 /* Rx descriptor + PHY data */ 297 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) + 298 phy_length); 299 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d)); 300 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data, 301 phy_length); 302 } 303 } 304 305 /* 306 * Fast swap in place between 2 registers 307 */ 308 static void wil_swap_u16(u16 *a, u16 *b) 309 { 310 *a ^= *b; 311 *b ^= *a; 312 *a ^= *b; 313 } 314 315 static void wil_swap_ethaddr(void *data) 316 { 317 struct ethhdr *eth = data; 318 u16 *s = (u16 *)eth->h_source; 319 u16 *d = (u16 *)eth->h_dest; 320 321 wil_swap_u16(s++, d++); 322 wil_swap_u16(s++, d++); 323 wil_swap_u16(s, d); 324 } 325 326 /** 327 * reap 1 frame from @swhead 328 * 329 * Rx descriptor copied to skb->cb 330 * 331 * Safe to call from IRQ 332 */ 333 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, 334 struct vring *vring) 335 { 336 struct device *dev = wil_to_dev(wil); 337 struct net_device *ndev = wil_to_ndev(wil); 338 volatile struct vring_rx_desc *_d; 339 struct vring_rx_desc *d; 340 struct sk_buff *skb; 341 dma_addr_t pa; 342 unsigned int sz = RX_BUF_LEN; 343 u16 dmalen; 344 u8 ftype; 345 u8 ds_bits; 346 347 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb)); 348 349 if (wil_vring_is_empty(vring)) 350 return NULL; 351 352 _d = &(vring->va[vring->swhead].rx); 353 if (!(_d->dma.status & RX_DMA_STATUS_DU)) { 354 /* it is not error, we just reached end of Rx done area */ 355 return NULL; 356 } 357 358 skb = vring->ctx[vring->swhead].skb; 359 d = wil_skb_rxdesc(skb); 360 *d = *_d; 361 pa = wil_desc_addr(&d->dma.addr); 362 vring->ctx[vring->swhead].skb = NULL; 363 wil_vring_advance_head(vring, 1); 364 365 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE); 366 dmalen = le16_to_cpu(d->dma.length); 367 368 trace_wil6210_rx(vring->swhead, d); 369 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen); 370 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4, 371 (const void *)d, sizeof(*d), false); 372 373 if (dmalen > sz) { 374 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen); 375 kfree_skb(skb); 376 return NULL; 377 } 378 skb_trim(skb, dmalen); 379 380 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1, 381 skb->data, skb_headlen(skb), false); 382 383 384 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d); 385 386 /* use radiotap header only if required */ 387 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP) 388 wil_rx_add_radiotap_header(wil, skb); 389 390 /* no extra checks if in sniffer mode */ 391 if (ndev->type != ARPHRD_ETHER) 392 return skb; 393 /* 394 * Non-data frames may be delivered through Rx DMA channel (ex: BAR) 395 * Driver should recognize it by frame type, that is found 396 * in Rx descriptor. If type is not data, it is 802.11 frame as is 397 */ 398 ftype = wil_rxdesc_ftype(d) << 2; 399 if (ftype != IEEE80211_FTYPE_DATA) { 400 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype); 401 /* TODO: process it */ 402 kfree_skb(skb); 403 return NULL; 404 } 405 406 if (skb->len < ETH_HLEN) { 407 wil_err(wil, "Short frame, len = %d\n", skb->len); 408 /* TODO: process it (i.e. BAR) */ 409 kfree_skb(skb); 410 return NULL; 411 } 412 413 /* L4 IDENT is on when HW calculated checksum, check status 414 * and in case of error drop the packet 415 * higher stack layers will handle retransmission (if required) 416 */ 417 if (d->dma.status & RX_DMA_STATUS_L4_IDENT) { 418 /* L4 protocol identified, csum calculated */ 419 if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0) 420 skb->ip_summed = CHECKSUM_UNNECESSARY; 421 /* If HW reports bad checksum, let IP stack re-check it 422 * For example, HW don't understand Microsoft IP stack that 423 * mis-calculates TCP checksum - if it should be 0x0, 424 * it writes 0xffff in violation of RFC 1624 425 */ 426 } 427 428 ds_bits = wil_rxdesc_ds_bits(d); 429 if (ds_bits == 1) { 430 /* 431 * HW bug - in ToDS mode, i.e. Rx on AP side, 432 * addresses get swapped 433 */ 434 wil_swap_ethaddr(skb->data); 435 } 436 437 return skb; 438 } 439 440 /** 441 * allocate and fill up to @count buffers in rx ring 442 * buffers posted at @swtail 443 */ 444 static int wil_rx_refill(struct wil6210_priv *wil, int count) 445 { 446 struct net_device *ndev = wil_to_ndev(wil); 447 struct vring *v = &wil->vring_rx; 448 u32 next_tail; 449 int rc = 0; 450 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ? 451 WIL6210_RTAP_SIZE : 0; 452 453 for (; next_tail = wil_vring_next_tail(v), 454 (next_tail != v->swhead) && (count-- > 0); 455 v->swtail = next_tail) { 456 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom); 457 if (rc) { 458 wil_err(wil, "Error %d in wil_rx_refill[%d]\n", 459 rc, v->swtail); 460 break; 461 } 462 } 463 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail)); 464 465 return rc; 466 } 467 468 /* 469 * Pass Rx packet to the netif. Update statistics. 470 * Called in softirq context (NAPI poll). 471 */ 472 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev) 473 { 474 int rc; 475 unsigned int len = skb->len; 476 477 skb_orphan(skb); 478 479 rc = netif_receive_skb(skb); 480 481 if (likely(rc == NET_RX_SUCCESS)) { 482 ndev->stats.rx_packets++; 483 ndev->stats.rx_bytes += len; 484 485 } else { 486 ndev->stats.rx_dropped++; 487 } 488 } 489 490 /** 491 * Proceed all completed skb's from Rx VRING 492 * 493 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled 494 */ 495 void wil_rx_handle(struct wil6210_priv *wil, int *quota) 496 { 497 struct net_device *ndev = wil_to_ndev(wil); 498 struct vring *v = &wil->vring_rx; 499 struct sk_buff *skb; 500 501 if (!v->va) { 502 wil_err(wil, "Rx IRQ while Rx not yet initialized\n"); 503 return; 504 } 505 wil_dbg_txrx(wil, "%s()\n", __func__); 506 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) { 507 (*quota)--; 508 509 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { 510 skb->dev = ndev; 511 skb_reset_mac_header(skb); 512 skb->ip_summed = CHECKSUM_UNNECESSARY; 513 skb->pkt_type = PACKET_OTHERHOST; 514 skb->protocol = htons(ETH_P_802_2); 515 516 } else { 517 skb->protocol = eth_type_trans(skb, ndev); 518 } 519 520 wil_netif_rx_any(skb, ndev); 521 } 522 wil_rx_refill(wil, v->size); 523 } 524 525 int wil_rx_init(struct wil6210_priv *wil) 526 { 527 struct vring *vring = &wil->vring_rx; 528 int rc; 529 530 vring->size = WIL6210_RX_RING_SIZE; 531 rc = wil_vring_alloc(wil, vring); 532 if (rc) 533 return rc; 534 535 rc = wmi_rx_chain_add(wil, vring); 536 if (rc) 537 goto err_free; 538 539 rc = wil_rx_refill(wil, vring->size); 540 if (rc) 541 goto err_free; 542 543 return 0; 544 err_free: 545 wil_vring_free(wil, vring, 0); 546 547 return rc; 548 } 549 550 void wil_rx_fini(struct wil6210_priv *wil) 551 { 552 struct vring *vring = &wil->vring_rx; 553 554 if (vring->va) 555 wil_vring_free(wil, vring, 0); 556 } 557 558 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size, 559 int cid, int tid) 560 { 561 int rc; 562 struct wmi_vring_cfg_cmd cmd = { 563 .action = cpu_to_le32(WMI_VRING_CMD_ADD), 564 .vring_cfg = { 565 .tx_sw_ring = { 566 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN), 567 .ring_size = cpu_to_le16(size), 568 }, 569 .ringid = id, 570 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4), 571 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, 572 .mac_ctrl = 0, 573 .to_resolution = 0, 574 .agg_max_wsize = 16, 575 .schd_params = { 576 .priority = cpu_to_le16(0), 577 .timeslot_us = cpu_to_le16(0xfff), 578 }, 579 }, 580 }; 581 struct { 582 struct wil6210_mbox_hdr_wmi wmi; 583 struct wmi_vring_cfg_done_event cmd; 584 } __packed reply; 585 struct vring *vring = &wil->vring_tx[id]; 586 587 if (vring->va) { 588 wil_err(wil, "Tx ring [%d] already allocated\n", id); 589 rc = -EINVAL; 590 goto out; 591 } 592 593 vring->size = size; 594 rc = wil_vring_alloc(wil, vring); 595 if (rc) 596 goto out; 597 598 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); 599 600 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd), 601 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100); 602 if (rc) 603 goto out_free; 604 605 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) { 606 wil_err(wil, "Tx config failed, status 0x%02x\n", 607 reply.cmd.status); 608 rc = -EINVAL; 609 goto out_free; 610 } 611 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr); 612 613 return 0; 614 out_free: 615 wil_vring_free(wil, vring, 1); 616 out: 617 618 return rc; 619 } 620 621 void wil_vring_fini_tx(struct wil6210_priv *wil, int id) 622 { 623 struct vring *vring = &wil->vring_tx[id]; 624 625 if (!vring->va) 626 return; 627 628 wil_vring_free(wil, vring, 1); 629 } 630 631 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil, 632 struct sk_buff *skb) 633 { 634 struct vring *v = &wil->vring_tx[0]; 635 636 if (v->va) 637 return v; 638 639 return NULL; 640 } 641 642 static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len, 643 int vring_index) 644 { 645 wil_desc_addr_set(&d->dma.addr, pa); 646 d->dma.ip_length = 0; 647 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/ 648 d->dma.b11 = 0/*14 | BIT(7)*/; 649 d->dma.error = 0; 650 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 651 d->dma.length = cpu_to_le16((u16)len); 652 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS); 653 d->mac.d[0] = 0; 654 d->mac.d[1] = 0; 655 d->mac.d[2] = 0; 656 d->mac.ucode_cmd = 0; 657 /* use dst index 0 */ 658 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) | 659 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS); 660 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */ 661 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) | 662 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS); 663 664 return 0; 665 } 666 667 static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil, 668 struct vring_tx_desc *d, 669 struct sk_buff *skb) 670 { 671 int protocol; 672 673 if (skb->ip_summed != CHECKSUM_PARTIAL) 674 return 0; 675 676 switch (skb->protocol) { 677 case cpu_to_be16(ETH_P_IP): 678 protocol = ip_hdr(skb)->protocol; 679 break; 680 case cpu_to_be16(ETH_P_IPV6): 681 protocol = ipv6_hdr(skb)->nexthdr; 682 break; 683 default: 684 return -EINVAL; 685 } 686 687 switch (protocol) { 688 case IPPROTO_TCP: 689 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS); 690 /* L4 header len: TCP header length */ 691 d->dma.d0 |= 692 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK); 693 break; 694 case IPPROTO_UDP: 695 /* L4 header len: UDP header length */ 696 d->dma.d0 |= 697 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK); 698 break; 699 default: 700 return -EINVAL; 701 } 702 703 d->dma.ip_length = skb_network_header_len(skb); 704 d->dma.b11 = ETH_HLEN; /* MAC header length */ 705 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS); 706 /* Enable TCP/UDP checksum */ 707 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS); 708 /* Calculate pseudo-header */ 709 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS); 710 711 return 0; 712 } 713 714 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, 715 struct sk_buff *skb) 716 { 717 struct device *dev = wil_to_dev(wil); 718 struct vring_tx_desc dd, *d = ⅆ 719 volatile struct vring_tx_desc *_d; 720 u32 swhead = vring->swhead; 721 int avail = wil_vring_avail_tx(vring); 722 int nr_frags = skb_shinfo(skb)->nr_frags; 723 uint f = 0; 724 int vring_index = vring - wil->vring_tx; 725 uint i = swhead; 726 dma_addr_t pa; 727 728 wil_dbg_txrx(wil, "%s()\n", __func__); 729 730 if (avail < vring->size/8) 731 netif_tx_stop_all_queues(wil_to_ndev(wil)); 732 if (avail < 1 + nr_frags) { 733 wil_err(wil, "Tx ring full. No space for %d fragments\n", 734 1 + nr_frags); 735 return -ENOMEM; 736 } 737 _d = &(vring->va[i].tx); 738 739 /* FIXME FW can accept only unicast frames for the peer */ 740 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN); 741 742 pa = dma_map_single(dev, skb->data, 743 skb_headlen(skb), DMA_TO_DEVICE); 744 745 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb), 746 skb->data, (unsigned long long)pa); 747 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1, 748 skb->data, skb_headlen(skb), false); 749 750 if (unlikely(dma_mapping_error(dev, pa))) 751 return -EINVAL; 752 /* 1-st segment */ 753 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index); 754 /* Process TCP/UDP checksum offloading */ 755 if (wil_tx_desc_offload_cksum_set(wil, d, skb)) { 756 wil_err(wil, "VRING #%d Failed to set cksum, drop packet\n", 757 vring_index); 758 goto dma_error; 759 } 760 761 d->mac.d[2] |= ((nr_frags + 1) << 762 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS); 763 if (nr_frags) 764 *_d = *d; 765 766 /* middle segments */ 767 for (; f < nr_frags; f++) { 768 const struct skb_frag_struct *frag = 769 &skb_shinfo(skb)->frags[f]; 770 int len = skb_frag_size(frag); 771 i = (swhead + f + 1) % vring->size; 772 _d = &(vring->va[i].tx); 773 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag), 774 DMA_TO_DEVICE); 775 if (unlikely(dma_mapping_error(dev, pa))) 776 goto dma_error; 777 wil_tx_desc_map(d, pa, len, vring_index); 778 vring->ctx[i].mapped_as_page = 1; 779 *_d = *d; 780 } 781 /* for the last seg only */ 782 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS); 783 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS); 784 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS); 785 *_d = *d; 786 787 /* hold reference to skb 788 * to prevent skb release before accounting 789 * in case of immediate "tx done" 790 */ 791 vring->ctx[i].skb = skb_get(skb); 792 793 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4, 794 (const void *)d, sizeof(*d), false); 795 796 /* advance swhead */ 797 wil_vring_advance_head(vring, nr_frags + 1); 798 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead); 799 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags); 800 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail)); 801 802 return 0; 803 dma_error: 804 /* unmap what we have mapped */ 805 nr_frags = f + 1; /* frags mapped + one for skb head */ 806 for (f = 0; f < nr_frags; f++) { 807 u16 dmalen; 808 struct wil_ctx *ctx; 809 810 i = (swhead + f) % vring->size; 811 ctx = &vring->ctx[i]; 812 _d = &(vring->va[i].tx); 813 *d = *_d; 814 _d->dma.status = TX_DMA_STATUS_DU; 815 pa = wil_desc_addr(&d->dma.addr); 816 dmalen = le16_to_cpu(d->dma.length); 817 if (ctx->mapped_as_page) 818 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE); 819 else 820 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE); 821 822 if (ctx->skb) 823 dev_kfree_skb_any(ctx->skb); 824 825 memset(ctx, 0, sizeof(*ctx)); 826 } 827 828 return -EINVAL; 829 } 830 831 832 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev) 833 { 834 struct wil6210_priv *wil = ndev_to_wil(ndev); 835 struct vring *vring; 836 int rc; 837 838 wil_dbg_txrx(wil, "%s()\n", __func__); 839 if (!test_bit(wil_status_fwready, &wil->status)) { 840 wil_err(wil, "FW not ready\n"); 841 goto drop; 842 } 843 if (!test_bit(wil_status_fwconnected, &wil->status)) { 844 wil_err(wil, "FW not connected\n"); 845 goto drop; 846 } 847 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { 848 wil_err(wil, "Xmit in monitor mode not supported\n"); 849 goto drop; 850 } 851 852 /* find vring */ 853 vring = wil_find_tx_vring(wil, skb); 854 if (!vring) { 855 wil_err(wil, "No Tx VRING available\n"); 856 goto drop; 857 } 858 /* set up vring entry */ 859 rc = wil_tx_vring(wil, vring, skb); 860 861 switch (rc) { 862 case 0: 863 /* statistics will be updated on the tx_complete */ 864 dev_kfree_skb_any(skb); 865 return NETDEV_TX_OK; 866 case -ENOMEM: 867 return NETDEV_TX_BUSY; 868 default: 869 break; /* goto drop; */ 870 } 871 drop: 872 ndev->stats.tx_dropped++; 873 dev_kfree_skb_any(skb); 874 875 return NET_XMIT_DROP; 876 } 877 878 /** 879 * Clean up transmitted skb's from the Tx VRING 880 * 881 * Return number of descriptors cleared 882 * 883 * Safe to call from IRQ 884 */ 885 int wil_tx_complete(struct wil6210_priv *wil, int ringid) 886 { 887 struct net_device *ndev = wil_to_ndev(wil); 888 struct device *dev = wil_to_dev(wil); 889 struct vring *vring = &wil->vring_tx[ringid]; 890 int done = 0; 891 892 if (!vring->va) { 893 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid); 894 return 0; 895 } 896 897 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid); 898 899 while (!wil_vring_is_empty(vring)) { 900 volatile struct vring_tx_desc *_d = 901 &vring->va[vring->swtail].tx; 902 struct vring_tx_desc dd, *d = ⅆ 903 dma_addr_t pa; 904 u16 dmalen; 905 struct wil_ctx *ctx = &vring->ctx[vring->swtail]; 906 struct sk_buff *skb = ctx->skb; 907 908 *d = *_d; 909 910 if (!(d->dma.status & TX_DMA_STATUS_DU)) 911 break; 912 913 dmalen = le16_to_cpu(d->dma.length); 914 trace_wil6210_tx_done(ringid, vring->swtail, dmalen, 915 d->dma.error); 916 wil_dbg_txrx(wil, 917 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n", 918 vring->swtail, dmalen, d->dma.status, 919 d->dma.error); 920 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4, 921 (const void *)d, sizeof(*d), false); 922 923 pa = wil_desc_addr(&d->dma.addr); 924 if (ctx->mapped_as_page) 925 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE); 926 else 927 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE); 928 929 if (skb) { 930 if (d->dma.error == 0) { 931 ndev->stats.tx_packets++; 932 ndev->stats.tx_bytes += skb->len; 933 } else { 934 ndev->stats.tx_errors++; 935 } 936 937 dev_kfree_skb_any(skb); 938 } 939 memset(ctx, 0, sizeof(*ctx)); 940 /* 941 * There is no need to touch HW descriptor: 942 * - ststus bit TX_DMA_STATUS_DU is set by design, 943 * so hardware will not try to process this desc., 944 * - rest of descriptor will be initialized on Tx. 945 */ 946 vring->swtail = wil_vring_next_tail(vring); 947 done++; 948 } 949 if (wil_vring_avail_tx(vring) > vring->size/4) 950 netif_tx_wake_all_queues(wil_to_ndev(wil)); 951 952 return done; 953 } 954