1/* 2 * Copyright (c) 2012-2014 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#include <linux/prefetch.h> 25 26#include "wil6210.h" 27#include "wmi.h" 28#include "txrx.h" 29#include "trace.h" 30 31static bool rtap_include_phy_info; 32module_param(rtap_include_phy_info, bool, S_IRUGO); 33MODULE_PARM_DESC(rtap_include_phy_info, 34 " Include PHY info in the radiotap header, default - no"); 35 36bool rx_align_2; 37module_param(rx_align_2, bool, S_IRUGO); 38MODULE_PARM_DESC(rx_align_2, " align Rx buffers on 4*n+2, default - no"); 39 40static inline uint wil_rx_snaplen(void) 41{ 42 return rx_align_2 ? 6 : 0; 43} 44 45static inline int wil_vring_is_empty(struct vring *vring) 46{ 47 return vring->swhead == vring->swtail; 48} 49 50static inline u32 wil_vring_next_tail(struct vring *vring) 51{ 52 return (vring->swtail + 1) % vring->size; 53} 54 55static inline void wil_vring_advance_head(struct vring *vring, int n) 56{ 57 vring->swhead = (vring->swhead + n) % vring->size; 58} 59 60static inline int wil_vring_is_full(struct vring *vring) 61{ 62 return wil_vring_next_tail(vring) == vring->swhead; 63} 64 65/* Used space in Tx Vring */ 66static inline int wil_vring_used_tx(struct vring *vring) 67{ 68 u32 swhead = vring->swhead; 69 u32 swtail = vring->swtail; 70 return (vring->size + swhead - swtail) % vring->size; 71} 72 73/* Available space in Tx Vring */ 74static inline int wil_vring_avail_tx(struct vring *vring) 75{ 76 return vring->size - wil_vring_used_tx(vring) - 1; 77} 78 79/* wil_vring_wmark_low - low watermark for available descriptor space */ 80static inline int wil_vring_wmark_low(struct vring *vring) 81{ 82 return vring->size/8; 83} 84 85/* wil_vring_wmark_high - high watermark for available descriptor space */ 86static inline int wil_vring_wmark_high(struct vring *vring) 87{ 88 return vring->size/4; 89} 90 91/* wil_val_in_range - check if value in [min,max) */ 92static inline bool wil_val_in_range(int val, int min, int max) 93{ 94 return val >= min && val < max; 95} 96 97static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring) 98{ 99 struct device *dev = wil_to_dev(wil); 100 size_t sz = vring->size * sizeof(vring->va[0]); 101 uint i; 102 103 wil_dbg_misc(wil, "%s()\n", __func__); 104 105 BUILD_BUG_ON(sizeof(vring->va[0]) != 32); 106 107 vring->swhead = 0; 108 vring->swtail = 0; 109 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL); 110 if (!vring->ctx) { 111 vring->va = NULL; 112 return -ENOMEM; 113 } 114 /* vring->va should be aligned on its size rounded up to power of 2 115 * This is granted by the dma_alloc_coherent 116 */ 117 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL); 118 if (!vring->va) { 119 kfree(vring->ctx); 120 vring->ctx = NULL; 121 return -ENOMEM; 122 } 123 /* initially, all descriptors are SW owned 124 * For Tx and Rx, ownership bit is at the same location, thus 125 * we can use any 126 */ 127 for (i = 0; i < vring->size; i++) { 128 volatile struct vring_tx_desc *_d = &vring->va[i].tx; 129 130 _d->dma.status = TX_DMA_STATUS_DU; 131 } 132 133 wil_dbg_misc(wil, "vring[%d] 0x%p:%pad 0x%p\n", vring->size, 134 vring->va, &vring->pa, vring->ctx); 135 136 return 0; 137} 138 139static void wil_txdesc_unmap(struct device *dev, struct vring_tx_desc *d, 140 struct wil_ctx *ctx) 141{ 142 dma_addr_t pa = wil_desc_addr(&d->dma.addr); 143 u16 dmalen = le16_to_cpu(d->dma.length); 144 145 switch (ctx->mapped_as) { 146 case wil_mapped_as_single: 147 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE); 148 break; 149 case wil_mapped_as_page: 150 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE); 151 break; 152 default: 153 break; 154 } 155} 156 157static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring, 158 int tx) 159{ 160 struct device *dev = wil_to_dev(wil); 161 size_t sz = vring->size * sizeof(vring->va[0]); 162 163 if (tx) { 164 int vring_index = vring - wil->vring_tx; 165 166 wil_dbg_misc(wil, "free Tx vring %d [%d] 0x%p:%pad 0x%p\n", 167 vring_index, vring->size, vring->va, 168 &vring->pa, vring->ctx); 169 } else { 170 wil_dbg_misc(wil, "free Rx vring [%d] 0x%p:%pad 0x%p\n", 171 vring->size, vring->va, 172 &vring->pa, vring->ctx); 173 } 174 175 while (!wil_vring_is_empty(vring)) { 176 dma_addr_t pa; 177 u16 dmalen; 178 struct wil_ctx *ctx; 179 180 if (tx) { 181 struct vring_tx_desc dd, *d = ⅆ 182 volatile struct vring_tx_desc *_d = 183 &vring->va[vring->swtail].tx; 184 185 ctx = &vring->ctx[vring->swtail]; 186 *d = *_d; 187 wil_txdesc_unmap(dev, d, ctx); 188 if (ctx->skb) 189 dev_kfree_skb_any(ctx->skb); 190 vring->swtail = wil_vring_next_tail(vring); 191 } else { /* rx */ 192 struct vring_rx_desc dd, *d = ⅆ 193 volatile struct vring_rx_desc *_d = 194 &vring->va[vring->swhead].rx; 195 196 ctx = &vring->ctx[vring->swhead]; 197 *d = *_d; 198 pa = wil_desc_addr(&d->dma.addr); 199 dmalen = le16_to_cpu(d->dma.length); 200 dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE); 201 kfree_skb(ctx->skb); 202 wil_vring_advance_head(vring, 1); 203 } 204 } 205 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa); 206 kfree(vring->ctx); 207 vring->pa = 0; 208 vring->va = NULL; 209 vring->ctx = NULL; 210} 211 212/** 213 * Allocate one skb for Rx VRING 214 * 215 * Safe to call from IRQ 216 */ 217static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring, 218 u32 i, int headroom) 219{ 220 struct device *dev = wil_to_dev(wil); 221 unsigned int sz = mtu_max + ETH_HLEN + wil_rx_snaplen(); 222 struct vring_rx_desc dd, *d = ⅆ 223 volatile struct vring_rx_desc *_d = &vring->va[i].rx; 224 dma_addr_t pa; 225 struct sk_buff *skb = dev_alloc_skb(sz + headroom); 226 227 if (unlikely(!skb)) 228 return -ENOMEM; 229 230 skb_reserve(skb, headroom); 231 skb_put(skb, sz); 232 233 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE); 234 if (unlikely(dma_mapping_error(dev, pa))) { 235 kfree_skb(skb); 236 return -ENOMEM; 237 } 238 239 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT; 240 wil_desc_addr_set(&d->dma.addr, pa); 241 /* ip_length don't care */ 242 /* b11 don't care */ 243 /* error don't care */ 244 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 245 d->dma.length = cpu_to_le16(sz); 246 *_d = *d; 247 vring->ctx[i].skb = skb; 248 249 return 0; 250} 251 252/** 253 * Adds radiotap header 254 * 255 * Any error indicated as "Bad FCS" 256 * 257 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of: 258 * - Rx descriptor: 32 bytes 259 * - Phy info 260 */ 261static void wil_rx_add_radiotap_header(struct wil6210_priv *wil, 262 struct sk_buff *skb) 263{ 264 struct wireless_dev *wdev = wil->wdev; 265 struct wil6210_rtap { 266 struct ieee80211_radiotap_header rthdr; 267 /* fields should be in the order of bits in rthdr.it_present */ 268 /* flags */ 269 u8 flags; 270 /* channel */ 271 __le16 chnl_freq __aligned(2); 272 __le16 chnl_flags; 273 /* MCS */ 274 u8 mcs_present; 275 u8 mcs_flags; 276 u8 mcs_index; 277 } __packed; 278 struct wil6210_rtap_vendor { 279 struct wil6210_rtap rtap; 280 /* vendor */ 281 u8 vendor_oui[3] __aligned(2); 282 u8 vendor_ns; 283 __le16 vendor_skip; 284 u8 vendor_data[0]; 285 } __packed; 286 struct vring_rx_desc *d = wil_skb_rxdesc(skb); 287 struct wil6210_rtap_vendor *rtap_vendor; 288 int rtap_len = sizeof(struct wil6210_rtap); 289 int phy_length = 0; /* phy info header size, bytes */ 290 static char phy_data[128]; 291 struct ieee80211_channel *ch = wdev->preset_chandef.chan; 292 293 if (rtap_include_phy_info) { 294 rtap_len = sizeof(*rtap_vendor) + sizeof(*d); 295 /* calculate additional length */ 296 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) { 297 /** 298 * PHY info starts from 8-byte boundary 299 * there are 8-byte lines, last line may be partially 300 * written (HW bug), thus FW configures for last line 301 * to be excessive. Driver skips this last line. 302 */ 303 int len = min_t(int, 8 + sizeof(phy_data), 304 wil_rxdesc_phy_length(d)); 305 306 if (len > 8) { 307 void *p = skb_tail_pointer(skb); 308 void *pa = PTR_ALIGN(p, 8); 309 310 if (skb_tailroom(skb) >= len + (pa - p)) { 311 phy_length = len - 8; 312 memcpy(phy_data, pa, phy_length); 313 } 314 } 315 } 316 rtap_len += phy_length; 317 } 318 319 if (skb_headroom(skb) < rtap_len && 320 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) { 321 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len); 322 return; 323 } 324 325 rtap_vendor = (void *)skb_push(skb, rtap_len); 326 memset(rtap_vendor, 0, rtap_len); 327 328 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION; 329 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len); 330 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32( 331 (1 << IEEE80211_RADIOTAP_FLAGS) | 332 (1 << IEEE80211_RADIOTAP_CHANNEL) | 333 (1 << IEEE80211_RADIOTAP_MCS)); 334 if (d->dma.status & RX_DMA_STATUS_ERROR) 335 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS; 336 337 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320); 338 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0); 339 340 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS; 341 rtap_vendor->rtap.mcs_flags = 0; 342 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d); 343 344 if (rtap_include_phy_info) { 345 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 << 346 IEEE80211_RADIOTAP_VENDOR_NAMESPACE); 347 /* OUI for Wilocity 04:ce:14 */ 348 rtap_vendor->vendor_oui[0] = 0x04; 349 rtap_vendor->vendor_oui[1] = 0xce; 350 rtap_vendor->vendor_oui[2] = 0x14; 351 rtap_vendor->vendor_ns = 1; 352 /* Rx descriptor + PHY data */ 353 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) + 354 phy_length); 355 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d)); 356 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data, 357 phy_length); 358 } 359} 360 361/** 362 * reap 1 frame from @swhead 363 * 364 * Rx descriptor copied to skb->cb 365 * 366 * Safe to call from IRQ 367 */ 368static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, 369 struct vring *vring) 370{ 371 struct device *dev = wil_to_dev(wil); 372 struct net_device *ndev = wil_to_ndev(wil); 373 volatile struct vring_rx_desc *_d; 374 struct vring_rx_desc *d; 375 struct sk_buff *skb; 376 dma_addr_t pa; 377 unsigned int snaplen = wil_rx_snaplen(); 378 unsigned int sz = mtu_max + ETH_HLEN + snaplen; 379 u16 dmalen; 380 u8 ftype; 381 int cid; 382 int i = (int)vring->swhead; 383 struct wil_net_stats *stats; 384 385 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb)); 386 387 if (unlikely(wil_vring_is_empty(vring))) 388 return NULL; 389 390 _d = &vring->va[i].rx; 391 if (unlikely(!(_d->dma.status & RX_DMA_STATUS_DU))) { 392 /* it is not error, we just reached end of Rx done area */ 393 return NULL; 394 } 395 396 skb = vring->ctx[i].skb; 397 vring->ctx[i].skb = NULL; 398 wil_vring_advance_head(vring, 1); 399 if (!skb) { 400 wil_err(wil, "No Rx skb at [%d]\n", i); 401 return NULL; 402 } 403 d = wil_skb_rxdesc(skb); 404 *d = *_d; 405 pa = wil_desc_addr(&d->dma.addr); 406 407 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE); 408 dmalen = le16_to_cpu(d->dma.length); 409 410 trace_wil6210_rx(i, d); 411 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", i, dmalen); 412 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4, 413 (const void *)d, sizeof(*d), false); 414 415 if (unlikely(dmalen > sz)) { 416 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen); 417 kfree_skb(skb); 418 return NULL; 419 } 420 skb_trim(skb, dmalen); 421 422 prefetch(skb->data); 423 424 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1, 425 skb->data, skb_headlen(skb), false); 426 427 cid = wil_rxdesc_cid(d); 428 stats = &wil->sta[cid].stats; 429 stats->last_mcs_rx = wil_rxdesc_mcs(d); 430 431 /* use radiotap header only if required */ 432 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP) 433 wil_rx_add_radiotap_header(wil, skb); 434 435 /* no extra checks if in sniffer mode */ 436 if (ndev->type != ARPHRD_ETHER) 437 return skb; 438 /* 439 * Non-data frames may be delivered through Rx DMA channel (ex: BAR) 440 * Driver should recognize it by frame type, that is found 441 * in Rx descriptor. If type is not data, it is 802.11 frame as is 442 */ 443 ftype = wil_rxdesc_ftype(d) << 2; 444 if (unlikely(ftype != IEEE80211_FTYPE_DATA)) { 445 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype); 446 /* TODO: process it */ 447 kfree_skb(skb); 448 return NULL; 449 } 450 451 if (unlikely(skb->len < ETH_HLEN + snaplen)) { 452 wil_err(wil, "Short frame, len = %d\n", skb->len); 453 /* TODO: process it (i.e. BAR) */ 454 kfree_skb(skb); 455 return NULL; 456 } 457 458 /* L4 IDENT is on when HW calculated checksum, check status 459 * and in case of error drop the packet 460 * higher stack layers will handle retransmission (if required) 461 */ 462 if (likely(d->dma.status & RX_DMA_STATUS_L4I)) { 463 /* L4 protocol identified, csum calculated */ 464 if (likely((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)) 465 skb->ip_summed = CHECKSUM_UNNECESSARY; 466 /* If HW reports bad checksum, let IP stack re-check it 467 * For example, HW don't understand Microsoft IP stack that 468 * mis-calculates TCP checksum - if it should be 0x0, 469 * it writes 0xffff in violation of RFC 1624 470 */ 471 } 472 473 if (snaplen) { 474 /* Packet layout 475 * +-------+-------+---------+------------+------+ 476 * | SA(6) | DA(6) | SNAP(6) | ETHTYPE(2) | DATA | 477 * +-------+-------+---------+------------+------+ 478 * Need to remove SNAP, shifting SA and DA forward 479 */ 480 memmove(skb->data + snaplen, skb->data, 2 * ETH_ALEN); 481 skb_pull(skb, snaplen); 482 } 483 484 return skb; 485} 486 487/** 488 * allocate and fill up to @count buffers in rx ring 489 * buffers posted at @swtail 490 */ 491static int wil_rx_refill(struct wil6210_priv *wil, int count) 492{ 493 struct net_device *ndev = wil_to_ndev(wil); 494 struct vring *v = &wil->vring_rx; 495 u32 next_tail; 496 int rc = 0; 497 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ? 498 WIL6210_RTAP_SIZE : 0; 499 500 for (; next_tail = wil_vring_next_tail(v), 501 (next_tail != v->swhead) && (count-- > 0); 502 v->swtail = next_tail) { 503 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom); 504 if (unlikely(rc)) { 505 wil_err(wil, "Error %d in wil_rx_refill[%d]\n", 506 rc, v->swtail); 507 break; 508 } 509 } 510 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail)); 511 512 return rc; 513} 514 515/* 516 * Pass Rx packet to the netif. Update statistics. 517 * Called in softirq context (NAPI poll). 518 */ 519void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev) 520{ 521 gro_result_t rc = GRO_NORMAL; 522 struct wil6210_priv *wil = ndev_to_wil(ndev); 523 struct wireless_dev *wdev = wil_to_wdev(wil); 524 unsigned int len = skb->len; 525 struct vring_rx_desc *d = wil_skb_rxdesc(skb); 526 int cid = wil_rxdesc_cid(d); /* always 0..7, no need to check */ 527 struct ethhdr *eth = (void *)skb->data; 528 /* here looking for DA, not A1, thus Rxdesc's 'mcast' indication 529 * is not suitable, need to look at data 530 */ 531 int mcast = is_multicast_ether_addr(eth->h_dest); 532 struct wil_net_stats *stats = &wil->sta[cid].stats; 533 struct sk_buff *xmit_skb = NULL; 534 static const char * const gro_res_str[] = { 535 [GRO_MERGED] = "GRO_MERGED", 536 [GRO_MERGED_FREE] = "GRO_MERGED_FREE", 537 [GRO_HELD] = "GRO_HELD", 538 [GRO_NORMAL] = "GRO_NORMAL", 539 [GRO_DROP] = "GRO_DROP", 540 }; 541 542 skb_orphan(skb); 543 544 if (wdev->iftype == NL80211_IFTYPE_AP && !wil->ap_isolate) { 545 if (mcast) { 546 /* send multicast frames both to higher layers in 547 * local net stack and back to the wireless medium 548 */ 549 xmit_skb = skb_copy(skb, GFP_ATOMIC); 550 } else { 551 int xmit_cid = wil_find_cid(wil, eth->h_dest); 552 553 if (xmit_cid >= 0) { 554 /* The destination station is associated to 555 * this AP (in this VLAN), so send the frame 556 * directly to it and do not pass it to local 557 * net stack. 558 */ 559 xmit_skb = skb; 560 skb = NULL; 561 } 562 } 563 } 564 if (xmit_skb) { 565 /* Send to wireless media and increase priority by 256 to 566 * keep the received priority instead of reclassifying 567 * the frame (see cfg80211_classify8021d). 568 */ 569 xmit_skb->dev = ndev; 570 xmit_skb->priority += 256; 571 xmit_skb->protocol = htons(ETH_P_802_3); 572 skb_reset_network_header(xmit_skb); 573 skb_reset_mac_header(xmit_skb); 574 wil_dbg_txrx(wil, "Rx -> Tx %d bytes\n", len); 575 dev_queue_xmit(xmit_skb); 576 } 577 578 if (skb) { /* deliver to local stack */ 579 580 skb->protocol = eth_type_trans(skb, ndev); 581 rc = napi_gro_receive(&wil->napi_rx, skb); 582 wil_dbg_txrx(wil, "Rx complete %d bytes => %s\n", 583 len, gro_res_str[rc]); 584 } 585 /* statistics. rc set to GRO_NORMAL for AP bridging */ 586 if (unlikely(rc == GRO_DROP)) { 587 ndev->stats.rx_dropped++; 588 stats->rx_dropped++; 589 wil_dbg_txrx(wil, "Rx drop %d bytes\n", len); 590 } else { 591 ndev->stats.rx_packets++; 592 stats->rx_packets++; 593 ndev->stats.rx_bytes += len; 594 stats->rx_bytes += len; 595 if (mcast) 596 ndev->stats.multicast++; 597 } 598} 599 600/** 601 * Proceed all completed skb's from Rx VRING 602 * 603 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled 604 */ 605void wil_rx_handle(struct wil6210_priv *wil, int *quota) 606{ 607 struct net_device *ndev = wil_to_ndev(wil); 608 struct vring *v = &wil->vring_rx; 609 struct sk_buff *skb; 610 611 if (unlikely(!v->va)) { 612 wil_err(wil, "Rx IRQ while Rx not yet initialized\n"); 613 return; 614 } 615 wil_dbg_txrx(wil, "%s()\n", __func__); 616 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) { 617 (*quota)--; 618 619 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { 620 skb->dev = ndev; 621 skb_reset_mac_header(skb); 622 skb->ip_summed = CHECKSUM_UNNECESSARY; 623 skb->pkt_type = PACKET_OTHERHOST; 624 skb->protocol = htons(ETH_P_802_2); 625 wil_netif_rx_any(skb, ndev); 626 } else { 627 wil_rx_reorder(wil, skb); 628 } 629 } 630 wil_rx_refill(wil, v->size); 631} 632 633int wil_rx_init(struct wil6210_priv *wil, u16 size) 634{ 635 struct vring *vring = &wil->vring_rx; 636 int rc; 637 638 wil_dbg_misc(wil, "%s()\n", __func__); 639 640 if (vring->va) { 641 wil_err(wil, "Rx ring already allocated\n"); 642 return -EINVAL; 643 } 644 645 vring->size = size; 646 rc = wil_vring_alloc(wil, vring); 647 if (rc) 648 return rc; 649 650 rc = wmi_rx_chain_add(wil, vring); 651 if (rc) 652 goto err_free; 653 654 rc = wil_rx_refill(wil, vring->size); 655 if (rc) 656 goto err_free; 657 658 return 0; 659 err_free: 660 wil_vring_free(wil, vring, 0); 661 662 return rc; 663} 664 665void wil_rx_fini(struct wil6210_priv *wil) 666{ 667 struct vring *vring = &wil->vring_rx; 668 669 wil_dbg_misc(wil, "%s()\n", __func__); 670 671 if (vring->va) 672 wil_vring_free(wil, vring, 0); 673} 674 675int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size, 676 int cid, int tid) 677{ 678 int rc; 679 struct wmi_vring_cfg_cmd cmd = { 680 .action = cpu_to_le32(WMI_VRING_CMD_ADD), 681 .vring_cfg = { 682 .tx_sw_ring = { 683 .max_mpdu_size = 684 cpu_to_le16(wil_mtu2macbuf(mtu_max)), 685 .ring_size = cpu_to_le16(size), 686 }, 687 .ringid = id, 688 .cidxtid = mk_cidxtid(cid, tid), 689 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, 690 .mac_ctrl = 0, 691 .to_resolution = 0, 692 .agg_max_wsize = 0, 693 .schd_params = { 694 .priority = cpu_to_le16(0), 695 .timeslot_us = cpu_to_le16(0xfff), 696 }, 697 }, 698 }; 699 struct { 700 struct wil6210_mbox_hdr_wmi wmi; 701 struct wmi_vring_cfg_done_event cmd; 702 } __packed reply; 703 struct vring *vring = &wil->vring_tx[id]; 704 struct vring_tx_data *txdata = &wil->vring_tx_data[id]; 705 706 wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__, 707 cmd.vring_cfg.tx_sw_ring.max_mpdu_size); 708 709 if (vring->va) { 710 wil_err(wil, "Tx ring [%d] already allocated\n", id); 711 rc = -EINVAL; 712 goto out; 713 } 714 715 memset(txdata, 0, sizeof(*txdata)); 716 spin_lock_init(&txdata->lock); 717 vring->size = size; 718 rc = wil_vring_alloc(wil, vring); 719 if (rc) 720 goto out; 721 722 wil->vring2cid_tid[id][0] = cid; 723 wil->vring2cid_tid[id][1] = tid; 724 725 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); 726 727 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd), 728 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100); 729 if (rc) 730 goto out_free; 731 732 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) { 733 wil_err(wil, "Tx config failed, status 0x%02x\n", 734 reply.cmd.status); 735 rc = -EINVAL; 736 goto out_free; 737 } 738 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr); 739 740 txdata->enabled = 1; 741 if (wil->sta[cid].data_port_open && (agg_wsize >= 0)) 742 wil_addba_tx_request(wil, id, agg_wsize); 743 744 return 0; 745 out_free: 746 wil_vring_free(wil, vring, 1); 747 out: 748 749 return rc; 750} 751 752int wil_vring_init_bcast(struct wil6210_priv *wil, int id, int size) 753{ 754 int rc; 755 struct wmi_bcast_vring_cfg_cmd cmd = { 756 .action = cpu_to_le32(WMI_VRING_CMD_ADD), 757 .vring_cfg = { 758 .tx_sw_ring = { 759 .max_mpdu_size = 760 cpu_to_le16(wil_mtu2macbuf(mtu_max)), 761 .ring_size = cpu_to_le16(size), 762 }, 763 .ringid = id, 764 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, 765 }, 766 }; 767 struct { 768 struct wil6210_mbox_hdr_wmi wmi; 769 struct wmi_vring_cfg_done_event cmd; 770 } __packed reply; 771 struct vring *vring = &wil->vring_tx[id]; 772 struct vring_tx_data *txdata = &wil->vring_tx_data[id]; 773 774 wil_dbg_misc(wil, "%s() max_mpdu_size %d\n", __func__, 775 cmd.vring_cfg.tx_sw_ring.max_mpdu_size); 776 777 if (vring->va) { 778 wil_err(wil, "Tx ring [%d] already allocated\n", id); 779 rc = -EINVAL; 780 goto out; 781 } 782 783 memset(txdata, 0, sizeof(*txdata)); 784 spin_lock_init(&txdata->lock); 785 vring->size = size; 786 rc = wil_vring_alloc(wil, vring); 787 if (rc) 788 goto out; 789 790 wil->vring2cid_tid[id][0] = WIL6210_MAX_CID; /* CID */ 791 wil->vring2cid_tid[id][1] = 0; /* TID */ 792 793 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); 794 795 rc = wmi_call(wil, WMI_BCAST_VRING_CFG_CMDID, &cmd, sizeof(cmd), 796 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100); 797 if (rc) 798 goto out_free; 799 800 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) { 801 wil_err(wil, "Tx config failed, status 0x%02x\n", 802 reply.cmd.status); 803 rc = -EINVAL; 804 goto out_free; 805 } 806 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr); 807 808 txdata->enabled = 1; 809 810 return 0; 811 out_free: 812 wil_vring_free(wil, vring, 1); 813 out: 814 815 return rc; 816} 817 818void wil_vring_fini_tx(struct wil6210_priv *wil, int id) 819{ 820 struct vring *vring = &wil->vring_tx[id]; 821 struct vring_tx_data *txdata = &wil->vring_tx_data[id]; 822 823 WARN_ON(!mutex_is_locked(&wil->mutex)); 824 825 if (!vring->va) 826 return; 827 828 wil_dbg_misc(wil, "%s() id=%d\n", __func__, id); 829 830 spin_lock_bh(&txdata->lock); 831 txdata->enabled = 0; /* no Tx can be in progress or start anew */ 832 spin_unlock_bh(&txdata->lock); 833 /* make sure NAPI won't touch this vring */ 834 if (test_bit(wil_status_napi_en, wil->status)) 835 napi_synchronize(&wil->napi_tx); 836 837 wil_vring_free(wil, vring, 1); 838 memset(txdata, 0, sizeof(*txdata)); 839} 840 841static struct vring *wil_find_tx_ucast(struct wil6210_priv *wil, 842 struct sk_buff *skb) 843{ 844 int i; 845 struct ethhdr *eth = (void *)skb->data; 846 int cid = wil_find_cid(wil, eth->h_dest); 847 848 if (cid < 0) 849 return NULL; 850 851 if (!wil->sta[cid].data_port_open && 852 (skb->protocol != cpu_to_be16(ETH_P_PAE))) 853 return NULL; 854 855 /* TODO: fix for multiple TID */ 856 for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) { 857 if (wil->vring2cid_tid[i][0] == cid) { 858 struct vring *v = &wil->vring_tx[i]; 859 860 wil_dbg_txrx(wil, "%s(%pM) -> [%d]\n", 861 __func__, eth->h_dest, i); 862 if (v->va) { 863 return v; 864 } else { 865 wil_dbg_txrx(wil, "vring[%d] not valid\n", i); 866 return NULL; 867 } 868 } 869 } 870 871 return NULL; 872} 873 874static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, 875 struct sk_buff *skb); 876 877static struct vring *wil_find_tx_vring_sta(struct wil6210_priv *wil, 878 struct sk_buff *skb) 879{ 880 struct vring *v; 881 int i; 882 u8 cid; 883 884 /* In the STA mode, it is expected to have only 1 VRING 885 * for the AP we connected to. 886 * find 1-st vring and see whether it is eligible for data 887 */ 888 for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) { 889 v = &wil->vring_tx[i]; 890 if (!v->va) 891 continue; 892 893 cid = wil->vring2cid_tid[i][0]; 894 if (cid >= WIL6210_MAX_CID) /* skip BCAST */ 895 continue; 896 897 if (!wil->sta[cid].data_port_open && 898 (skb->protocol != cpu_to_be16(ETH_P_PAE))) 899 break; 900 901 wil_dbg_txrx(wil, "Tx -> ring %d\n", i); 902 903 return v; 904 } 905 906 wil_dbg_txrx(wil, "Tx while no vrings active?\n"); 907 908 return NULL; 909} 910 911/* Use one of 2 strategies: 912 * 913 * 1. New (real broadcast): 914 * use dedicated broadcast vring 915 * 2. Old (pseudo-DMS): 916 * Find 1-st vring and return it; 917 * duplicate skb and send it to other active vrings; 918 * in all cases override dest address to unicast peer's address 919 * Use old strategy when new is not supported yet: 920 * - for PBSS 921 * - for secure link 922 */ 923static struct vring *wil_find_tx_bcast_1(struct wil6210_priv *wil, 924 struct sk_buff *skb) 925{ 926 struct vring *v; 927 int i = wil->bcast_vring; 928 929 if (i < 0) 930 return NULL; 931 v = &wil->vring_tx[i]; 932 if (!v->va) 933 return NULL; 934 935 return v; 936} 937 938static void wil_set_da_for_vring(struct wil6210_priv *wil, 939 struct sk_buff *skb, int vring_index) 940{ 941 struct ethhdr *eth = (void *)skb->data; 942 int cid = wil->vring2cid_tid[vring_index][0]; 943 944 ether_addr_copy(eth->h_dest, wil->sta[cid].addr); 945} 946 947static struct vring *wil_find_tx_bcast_2(struct wil6210_priv *wil, 948 struct sk_buff *skb) 949{ 950 struct vring *v, *v2; 951 struct sk_buff *skb2; 952 int i; 953 u8 cid; 954 struct ethhdr *eth = (void *)skb->data; 955 char *src = eth->h_source; 956 957 /* find 1-st vring eligible for data */ 958 for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) { 959 v = &wil->vring_tx[i]; 960 if (!v->va) 961 continue; 962 963 cid = wil->vring2cid_tid[i][0]; 964 if (cid >= WIL6210_MAX_CID) /* skip BCAST */ 965 continue; 966 if (!wil->sta[cid].data_port_open) 967 continue; 968 969 /* don't Tx back to source when re-routing Rx->Tx at the AP */ 970 if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN)) 971 continue; 972 973 goto found; 974 } 975 976 wil_dbg_txrx(wil, "Tx while no vrings active?\n"); 977 978 return NULL; 979 980found: 981 wil_dbg_txrx(wil, "BCAST -> ring %d\n", i); 982 wil_set_da_for_vring(wil, skb, i); 983 984 /* find other active vrings and duplicate skb for each */ 985 for (i++; i < WIL6210_MAX_TX_RINGS; i++) { 986 v2 = &wil->vring_tx[i]; 987 if (!v2->va) 988 continue; 989 cid = wil->vring2cid_tid[i][0]; 990 if (cid >= WIL6210_MAX_CID) /* skip BCAST */ 991 continue; 992 if (!wil->sta[cid].data_port_open) 993 continue; 994 995 if (0 == memcmp(wil->sta[cid].addr, src, ETH_ALEN)) 996 continue; 997 998 skb2 = skb_copy(skb, GFP_ATOMIC); 999 if (skb2) { 1000 wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i); 1001 wil_set_da_for_vring(wil, skb2, i); 1002 wil_tx_vring(wil, v2, skb2); 1003 } else { 1004 wil_err(wil, "skb_copy failed\n"); 1005 } 1006 } 1007 1008 return v; 1009} 1010 1011static struct vring *wil_find_tx_bcast(struct wil6210_priv *wil, 1012 struct sk_buff *skb) 1013{ 1014 struct wireless_dev *wdev = wil->wdev; 1015 1016 if (wdev->iftype != NL80211_IFTYPE_AP) 1017 return wil_find_tx_bcast_2(wil, skb); 1018 1019 if (wil->privacy) 1020 return wil_find_tx_bcast_2(wil, skb); 1021 1022 return wil_find_tx_bcast_1(wil, skb); 1023} 1024 1025static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len, 1026 int vring_index) 1027{ 1028 wil_desc_addr_set(&d->dma.addr, pa); 1029 d->dma.ip_length = 0; 1030 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/ 1031 d->dma.b11 = 0/*14 | BIT(7)*/; 1032 d->dma.error = 0; 1033 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 1034 d->dma.length = cpu_to_le16((u16)len); 1035 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS); 1036 d->mac.d[0] = 0; 1037 d->mac.d[1] = 0; 1038 d->mac.d[2] = 0; 1039 d->mac.ucode_cmd = 0; 1040 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */ 1041 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) | 1042 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS); 1043 1044 return 0; 1045} 1046 1047static inline 1048void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags) 1049{ 1050 d->mac.d[2] |= ((nr_frags + 1) << 1051 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS); 1052} 1053 1054static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil, 1055 struct vring_tx_desc *d, 1056 struct sk_buff *skb) 1057{ 1058 int protocol; 1059 1060 if (skb->ip_summed != CHECKSUM_PARTIAL) 1061 return 0; 1062 1063 d->dma.b11 = ETH_HLEN; /* MAC header length */ 1064 1065 switch (skb->protocol) { 1066 case cpu_to_be16(ETH_P_IP): 1067 protocol = ip_hdr(skb)->protocol; 1068 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS); 1069 break; 1070 case cpu_to_be16(ETH_P_IPV6): 1071 protocol = ipv6_hdr(skb)->nexthdr; 1072 break; 1073 default: 1074 return -EINVAL; 1075 } 1076 1077 switch (protocol) { 1078 case IPPROTO_TCP: 1079 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS); 1080 /* L4 header len: TCP header length */ 1081 d->dma.d0 |= 1082 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK); 1083 break; 1084 case IPPROTO_UDP: 1085 /* L4 header len: UDP header length */ 1086 d->dma.d0 |= 1087 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK); 1088 break; 1089 default: 1090 return -EINVAL; 1091 } 1092 1093 d->dma.ip_length = skb_network_header_len(skb); 1094 /* Enable TCP/UDP checksum */ 1095 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS); 1096 /* Calculate pseudo-header */ 1097 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS); 1098 1099 return 0; 1100} 1101 1102static int __wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, 1103 struct sk_buff *skb) 1104{ 1105 struct device *dev = wil_to_dev(wil); 1106 struct vring_tx_desc dd, *d = ⅆ 1107 volatile struct vring_tx_desc *_d; 1108 u32 swhead = vring->swhead; 1109 int avail = wil_vring_avail_tx(vring); 1110 int nr_frags = skb_shinfo(skb)->nr_frags; 1111 uint f = 0; 1112 int vring_index = vring - wil->vring_tx; 1113 struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index]; 1114 uint i = swhead; 1115 dma_addr_t pa; 1116 int used; 1117 bool mcast = (vring_index == wil->bcast_vring); 1118 uint len = skb_headlen(skb); 1119 1120 wil_dbg_txrx(wil, "%s()\n", __func__); 1121 1122 if (unlikely(!txdata->enabled)) 1123 return -EINVAL; 1124 1125 if (unlikely(avail < 1 + nr_frags)) { 1126 wil_err_ratelimited(wil, 1127 "Tx ring[%2d] full. No space for %d fragments\n", 1128 vring_index, 1 + nr_frags); 1129 return -ENOMEM; 1130 } 1131 _d = &vring->va[i].tx; 1132 1133 pa = dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); 1134 1135 wil_dbg_txrx(wil, "Tx[%2d] skb %d bytes 0x%p -> %pad\n", vring_index, 1136 skb_headlen(skb), skb->data, &pa); 1137 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1, 1138 skb->data, skb_headlen(skb), false); 1139 1140 if (unlikely(dma_mapping_error(dev, pa))) 1141 return -EINVAL; 1142 vring->ctx[i].mapped_as = wil_mapped_as_single; 1143 /* 1-st segment */ 1144 wil_tx_desc_map(d, pa, len, vring_index); 1145 if (unlikely(mcast)) { 1146 d->mac.d[0] |= BIT(MAC_CFG_DESC_TX_0_MCS_EN_POS); /* MCS 0 */ 1147 if (unlikely(len > WIL_BCAST_MCS0_LIMIT)) { 1148 /* set MCS 1 */ 1149 d->mac.d[0] |= (1 << MAC_CFG_DESC_TX_0_MCS_INDEX_POS); 1150 /* packet mode 2 */ 1151 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_PKT_MODE_EN_POS) | 1152 (2 << MAC_CFG_DESC_TX_1_PKT_MODE_POS); 1153 } 1154 } 1155 /* Process TCP/UDP checksum offloading */ 1156 if (unlikely(wil_tx_desc_offload_cksum_set(wil, d, skb))) { 1157 wil_err(wil, "Tx[%2d] Failed to set cksum, drop packet\n", 1158 vring_index); 1159 goto dma_error; 1160 } 1161 1162 vring->ctx[i].nr_frags = nr_frags; 1163 wil_tx_desc_set_nr_frags(d, nr_frags); 1164 1165 /* middle segments */ 1166 for (; f < nr_frags; f++) { 1167 const struct skb_frag_struct *frag = 1168 &skb_shinfo(skb)->frags[f]; 1169 int len = skb_frag_size(frag); 1170 1171 *_d = *d; 1172 wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i); 1173 wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4, 1174 (const void *)d, sizeof(*d), false); 1175 i = (swhead + f + 1) % vring->size; 1176 _d = &vring->va[i].tx; 1177 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag), 1178 DMA_TO_DEVICE); 1179 if (unlikely(dma_mapping_error(dev, pa))) 1180 goto dma_error; 1181 vring->ctx[i].mapped_as = wil_mapped_as_page; 1182 wil_tx_desc_map(d, pa, len, vring_index); 1183 /* no need to check return code - 1184 * if it succeeded for 1-st descriptor, 1185 * it will succeed here too 1186 */ 1187 wil_tx_desc_offload_cksum_set(wil, d, skb); 1188 } 1189 /* for the last seg only */ 1190 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS); 1191 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS); 1192 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS); 1193 *_d = *d; 1194 wil_dbg_txrx(wil, "Tx[%2d] desc[%4d]\n", vring_index, i); 1195 wil_hex_dump_txrx("TxD ", DUMP_PREFIX_NONE, 32, 4, 1196 (const void *)d, sizeof(*d), false); 1197 1198 /* hold reference to skb 1199 * to prevent skb release before accounting 1200 * in case of immediate "tx done" 1201 */ 1202 vring->ctx[i].skb = skb_get(skb); 1203 1204 /* performance monitoring */ 1205 used = wil_vring_used_tx(vring); 1206 if (wil_val_in_range(vring_idle_trsh, 1207 used, used + nr_frags + 1)) { 1208 txdata->idle += get_cycles() - txdata->last_idle; 1209 wil_dbg_txrx(wil, "Ring[%2d] not idle %d -> %d\n", 1210 vring_index, used, used + nr_frags + 1); 1211 } 1212 1213 /* advance swhead */ 1214 wil_vring_advance_head(vring, nr_frags + 1); 1215 wil_dbg_txrx(wil, "Tx[%2d] swhead %d -> %d\n", vring_index, swhead, 1216 vring->swhead); 1217 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags); 1218 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail)); 1219 1220 return 0; 1221 dma_error: 1222 /* unmap what we have mapped */ 1223 nr_frags = f + 1; /* frags mapped + one for skb head */ 1224 for (f = 0; f < nr_frags; f++) { 1225 struct wil_ctx *ctx; 1226 1227 i = (swhead + f) % vring->size; 1228 ctx = &vring->ctx[i]; 1229 _d = &vring->va[i].tx; 1230 *d = *_d; 1231 _d->dma.status = TX_DMA_STATUS_DU; 1232 wil_txdesc_unmap(dev, d, ctx); 1233 1234 if (ctx->skb) 1235 dev_kfree_skb_any(ctx->skb); 1236 1237 memset(ctx, 0, sizeof(*ctx)); 1238 } 1239 1240 return -EINVAL; 1241} 1242 1243static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, 1244 struct sk_buff *skb) 1245{ 1246 int vring_index = vring - wil->vring_tx; 1247 struct vring_tx_data *txdata = &wil->vring_tx_data[vring_index]; 1248 int rc; 1249 1250 spin_lock(&txdata->lock); 1251 rc = __wil_tx_vring(wil, vring, skb); 1252 spin_unlock(&txdata->lock); 1253 return rc; 1254} 1255 1256netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev) 1257{ 1258 struct wil6210_priv *wil = ndev_to_wil(ndev); 1259 struct ethhdr *eth = (void *)skb->data; 1260 bool bcast = is_multicast_ether_addr(eth->h_dest); 1261 struct vring *vring; 1262 static bool pr_once_fw; 1263 int rc; 1264 1265 wil_dbg_txrx(wil, "%s()\n", __func__); 1266 if (unlikely(!test_bit(wil_status_fwready, wil->status))) { 1267 if (!pr_once_fw) { 1268 wil_err(wil, "FW not ready\n"); 1269 pr_once_fw = true; 1270 } 1271 goto drop; 1272 } 1273 if (unlikely(!test_bit(wil_status_fwconnected, wil->status))) { 1274 wil_err(wil, "FW not connected\n"); 1275 goto drop; 1276 } 1277 if (unlikely(wil->wdev->iftype == NL80211_IFTYPE_MONITOR)) { 1278 wil_err(wil, "Xmit in monitor mode not supported\n"); 1279 goto drop; 1280 } 1281 pr_once_fw = false; 1282 1283 /* find vring */ 1284 if (wil->wdev->iftype == NL80211_IFTYPE_STATION) { 1285 /* in STA mode (ESS), all to same VRING */ 1286 vring = wil_find_tx_vring_sta(wil, skb); 1287 } else { /* direct communication, find matching VRING */ 1288 vring = bcast ? wil_find_tx_bcast(wil, skb) : 1289 wil_find_tx_ucast(wil, skb); 1290 } 1291 if (unlikely(!vring)) { 1292 wil_dbg_txrx(wil, "No Tx VRING found for %pM\n", eth->h_dest); 1293 goto drop; 1294 } 1295 /* set up vring entry */ 1296 rc = wil_tx_vring(wil, vring, skb); 1297 1298 /* do we still have enough room in the vring? */ 1299 if (unlikely(wil_vring_avail_tx(vring) < wil_vring_wmark_low(vring))) { 1300 netif_tx_stop_all_queues(wil_to_ndev(wil)); 1301 wil_dbg_txrx(wil, "netif_tx_stop : ring full\n"); 1302 } 1303 1304 switch (rc) { 1305 case 0: 1306 /* statistics will be updated on the tx_complete */ 1307 dev_kfree_skb_any(skb); 1308 return NETDEV_TX_OK; 1309 case -ENOMEM: 1310 return NETDEV_TX_BUSY; 1311 default: 1312 break; /* goto drop; */ 1313 } 1314 drop: 1315 ndev->stats.tx_dropped++; 1316 dev_kfree_skb_any(skb); 1317 1318 return NET_XMIT_DROP; 1319} 1320 1321static inline bool wil_need_txstat(struct sk_buff *skb) 1322{ 1323 struct ethhdr *eth = (void *)skb->data; 1324 1325 return is_unicast_ether_addr(eth->h_dest) && skb->sk && 1326 (skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS); 1327} 1328 1329static inline void wil_consume_skb(struct sk_buff *skb, bool acked) 1330{ 1331 if (unlikely(wil_need_txstat(skb))) 1332 skb_complete_wifi_ack(skb, acked); 1333 else 1334 acked ? dev_consume_skb_any(skb) : dev_kfree_skb_any(skb); 1335} 1336 1337/** 1338 * Clean up transmitted skb's from the Tx VRING 1339 * 1340 * Return number of descriptors cleared 1341 * 1342 * Safe to call from IRQ 1343 */ 1344int wil_tx_complete(struct wil6210_priv *wil, int ringid) 1345{ 1346 struct net_device *ndev = wil_to_ndev(wil); 1347 struct device *dev = wil_to_dev(wil); 1348 struct vring *vring = &wil->vring_tx[ringid]; 1349 struct vring_tx_data *txdata = &wil->vring_tx_data[ringid]; 1350 int done = 0; 1351 int cid = wil->vring2cid_tid[ringid][0]; 1352 struct wil_net_stats *stats = NULL; 1353 volatile struct vring_tx_desc *_d; 1354 int used_before_complete; 1355 int used_new; 1356 1357 if (unlikely(!vring->va)) { 1358 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid); 1359 return 0; 1360 } 1361 1362 if (unlikely(!txdata->enabled)) { 1363 wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid); 1364 return 0; 1365 } 1366 1367 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid); 1368 1369 used_before_complete = wil_vring_used_tx(vring); 1370 1371 if (cid < WIL6210_MAX_CID) 1372 stats = &wil->sta[cid].stats; 1373 1374 while (!wil_vring_is_empty(vring)) { 1375 int new_swtail; 1376 struct wil_ctx *ctx = &vring->ctx[vring->swtail]; 1377 /** 1378 * For the fragmented skb, HW will set DU bit only for the 1379 * last fragment. look for it 1380 */ 1381 int lf = (vring->swtail + ctx->nr_frags) % vring->size; 1382 /* TODO: check we are not past head */ 1383 1384 _d = &vring->va[lf].tx; 1385 if (unlikely(!(_d->dma.status & TX_DMA_STATUS_DU))) 1386 break; 1387 1388 new_swtail = (lf + 1) % vring->size; 1389 while (vring->swtail != new_swtail) { 1390 struct vring_tx_desc dd, *d = ⅆ 1391 u16 dmalen; 1392 struct sk_buff *skb; 1393 1394 ctx = &vring->ctx[vring->swtail]; 1395 skb = ctx->skb; 1396 _d = &vring->va[vring->swtail].tx; 1397 1398 *d = *_d; 1399 1400 dmalen = le16_to_cpu(d->dma.length); 1401 trace_wil6210_tx_done(ringid, vring->swtail, dmalen, 1402 d->dma.error); 1403 wil_dbg_txrx(wil, 1404 "TxC[%2d][%3d] : %d bytes, status 0x%02x err 0x%02x\n", 1405 ringid, vring->swtail, dmalen, 1406 d->dma.status, d->dma.error); 1407 wil_hex_dump_txrx("TxCD ", DUMP_PREFIX_NONE, 32, 4, 1408 (const void *)d, sizeof(*d), false); 1409 1410 wil_txdesc_unmap(dev, d, ctx); 1411 1412 if (skb) { 1413 if (likely(d->dma.error == 0)) { 1414 ndev->stats.tx_packets++; 1415 ndev->stats.tx_bytes += skb->len; 1416 if (stats) { 1417 stats->tx_packets++; 1418 stats->tx_bytes += skb->len; 1419 } 1420 } else { 1421 ndev->stats.tx_errors++; 1422 if (stats) 1423 stats->tx_errors++; 1424 } 1425 wil_consume_skb(skb, d->dma.error == 0); 1426 } 1427 memset(ctx, 0, sizeof(*ctx)); 1428 /* There is no need to touch HW descriptor: 1429 * - ststus bit TX_DMA_STATUS_DU is set by design, 1430 * so hardware will not try to process this desc., 1431 * - rest of descriptor will be initialized on Tx. 1432 */ 1433 vring->swtail = wil_vring_next_tail(vring); 1434 done++; 1435 } 1436 } 1437 1438 /* performance monitoring */ 1439 used_new = wil_vring_used_tx(vring); 1440 if (wil_val_in_range(vring_idle_trsh, 1441 used_new, used_before_complete)) { 1442 wil_dbg_txrx(wil, "Ring[%2d] idle %d -> %d\n", 1443 ringid, used_before_complete, used_new); 1444 txdata->last_idle = get_cycles(); 1445 } 1446 1447 if (wil_vring_avail_tx(vring) > wil_vring_wmark_high(vring)) { 1448 wil_dbg_txrx(wil, "netif_tx_wake : ring not full\n"); 1449 netif_tx_wake_all_queues(wil_to_ndev(wil)); 1450 } 1451 1452 return done; 1453} 1454