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 wil_err(wil, "vring_alloc [%d] failed to alloc ctx mem\n", 78 vring->size); 79 vring->va = NULL; 80 return -ENOMEM; 81 } 82 /* 83 * vring->va should be aligned on its size rounded up to power of 2 84 * This is granted by the dma_alloc_coherent 85 */ 86 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL); 87 if (!vring->va) { 88 wil_err(wil, "vring_alloc [%d] failed to alloc DMA mem\n", 89 vring->size); 90 kfree(vring->ctx); 91 vring->ctx = NULL; 92 return -ENOMEM; 93 } 94 /* initially, all descriptors are SW owned 95 * For Tx and Rx, ownership bit is at the same location, thus 96 * we can use any 97 */ 98 for (i = 0; i < vring->size; i++) { 99 volatile struct vring_tx_desc *d = &(vring->va[i].tx); 100 d->dma.status = TX_DMA_STATUS_DU; 101 } 102 103 wil_dbg(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size, 104 vring->va, (unsigned long long)vring->pa, vring->ctx); 105 106 return 0; 107 } 108 109 static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring, 110 int tx) 111 { 112 struct device *dev = wil_to_dev(wil); 113 size_t sz = vring->size * sizeof(vring->va[0]); 114 115 while (!wil_vring_is_empty(vring)) { 116 if (tx) { 117 volatile struct vring_tx_desc *d = 118 &vring->va[vring->swtail].tx; 119 dma_addr_t pa = d->dma.addr_low | 120 ((u64)d->dma.addr_high << 32); 121 struct sk_buff *skb = vring->ctx[vring->swtail]; 122 if (skb) { 123 dma_unmap_single(dev, pa, d->dma.length, 124 DMA_TO_DEVICE); 125 dev_kfree_skb_any(skb); 126 vring->ctx[vring->swtail] = NULL; 127 } else { 128 dma_unmap_page(dev, pa, d->dma.length, 129 DMA_TO_DEVICE); 130 } 131 vring->swtail = wil_vring_next_tail(vring); 132 } else { /* rx */ 133 volatile struct vring_rx_desc *d = 134 &vring->va[vring->swtail].rx; 135 dma_addr_t pa = d->dma.addr_low | 136 ((u64)d->dma.addr_high << 32); 137 struct sk_buff *skb = vring->ctx[vring->swhead]; 138 dma_unmap_single(dev, pa, d->dma.length, 139 DMA_FROM_DEVICE); 140 kfree_skb(skb); 141 wil_vring_advance_head(vring, 1); 142 } 143 } 144 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa); 145 kfree(vring->ctx); 146 vring->pa = 0; 147 vring->va = NULL; 148 vring->ctx = NULL; 149 } 150 151 /** 152 * Allocate one skb for Rx VRING 153 * 154 * Safe to call from IRQ 155 */ 156 static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring, 157 u32 i, int headroom) 158 { 159 struct device *dev = wil_to_dev(wil); 160 unsigned int sz = RX_BUF_LEN; 161 volatile struct vring_rx_desc *d = &(vring->va[i].rx); 162 dma_addr_t pa; 163 164 /* TODO align */ 165 struct sk_buff *skb = dev_alloc_skb(sz + headroom); 166 if (unlikely(!skb)) 167 return -ENOMEM; 168 169 skb_reserve(skb, headroom); 170 skb_put(skb, sz); 171 172 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE); 173 if (unlikely(dma_mapping_error(dev, pa))) { 174 kfree_skb(skb); 175 return -ENOMEM; 176 } 177 178 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT; 179 d->dma.addr_low = lower_32_bits(pa); 180 d->dma.addr_high = (u16)upper_32_bits(pa); 181 /* ip_length don't care */ 182 /* b11 don't care */ 183 /* error don't care */ 184 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 185 d->dma.length = sz; 186 vring->ctx[i] = skb; 187 188 return 0; 189 } 190 191 /** 192 * Adds radiotap header 193 * 194 * Any error indicated as "Bad FCS" 195 * 196 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of: 197 * - Rx descriptor: 32 bytes 198 * - Phy info 199 */ 200 static void wil_rx_add_radiotap_header(struct wil6210_priv *wil, 201 struct sk_buff *skb, 202 volatile struct vring_rx_desc *d) 203 { 204 struct wireless_dev *wdev = wil->wdev; 205 struct wil6210_rtap { 206 struct ieee80211_radiotap_header rthdr; 207 /* fields should be in the order of bits in rthdr.it_present */ 208 /* flags */ 209 u8 flags; 210 /* channel */ 211 __le16 chnl_freq __aligned(2); 212 __le16 chnl_flags; 213 /* MCS */ 214 u8 mcs_present; 215 u8 mcs_flags; 216 u8 mcs_index; 217 } __packed; 218 struct wil6210_rtap_vendor { 219 struct wil6210_rtap rtap; 220 /* vendor */ 221 u8 vendor_oui[3] __aligned(2); 222 u8 vendor_ns; 223 __le16 vendor_skip; 224 u8 vendor_data[0]; 225 } __packed; 226 struct wil6210_rtap_vendor *rtap_vendor; 227 int rtap_len = sizeof(struct wil6210_rtap); 228 int phy_length = 0; /* phy info header size, bytes */ 229 static char phy_data[128]; 230 struct ieee80211_channel *ch = wdev->preset_chandef.chan; 231 232 if (rtap_include_phy_info) { 233 rtap_len = sizeof(*rtap_vendor) + sizeof(*d); 234 /* calculate additional length */ 235 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) { 236 /** 237 * PHY info starts from 8-byte boundary 238 * there are 8-byte lines, last line may be partially 239 * written (HW bug), thus FW configures for last line 240 * to be excessive. Driver skips this last line. 241 */ 242 int len = min_t(int, 8 + sizeof(phy_data), 243 wil_rxdesc_phy_length(d)); 244 if (len > 8) { 245 void *p = skb_tail_pointer(skb); 246 void *pa = PTR_ALIGN(p, 8); 247 if (skb_tailroom(skb) >= len + (pa - p)) { 248 phy_length = len - 8; 249 memcpy(phy_data, pa, phy_length); 250 } 251 } 252 } 253 rtap_len += phy_length; 254 } 255 256 if (skb_headroom(skb) < rtap_len && 257 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) { 258 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len); 259 return; 260 } 261 262 rtap_vendor = (void *)skb_push(skb, rtap_len); 263 memset(rtap_vendor, 0, rtap_len); 264 265 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION; 266 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len); 267 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32( 268 (1 << IEEE80211_RADIOTAP_FLAGS) | 269 (1 << IEEE80211_RADIOTAP_CHANNEL) | 270 (1 << IEEE80211_RADIOTAP_MCS)); 271 if (d->dma.status & RX_DMA_STATUS_ERROR) 272 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS; 273 274 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320); 275 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0); 276 277 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS; 278 rtap_vendor->rtap.mcs_flags = 0; 279 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d); 280 281 if (rtap_include_phy_info) { 282 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 << 283 IEEE80211_RADIOTAP_VENDOR_NAMESPACE); 284 /* OUI for Wilocity 04:ce:14 */ 285 rtap_vendor->vendor_oui[0] = 0x04; 286 rtap_vendor->vendor_oui[1] = 0xce; 287 rtap_vendor->vendor_oui[2] = 0x14; 288 rtap_vendor->vendor_ns = 1; 289 /* Rx descriptor + PHY data */ 290 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) + 291 phy_length); 292 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d)); 293 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data, 294 phy_length); 295 } 296 } 297 298 /* 299 * Fast swap in place between 2 registers 300 */ 301 static void wil_swap_u16(u16 *a, u16 *b) 302 { 303 *a ^= *b; 304 *b ^= *a; 305 *a ^= *b; 306 } 307 308 static void wil_swap_ethaddr(void *data) 309 { 310 struct ethhdr *eth = data; 311 u16 *s = (u16 *)eth->h_source; 312 u16 *d = (u16 *)eth->h_dest; 313 314 wil_swap_u16(s++, d++); 315 wil_swap_u16(s++, d++); 316 wil_swap_u16(s, d); 317 } 318 319 /** 320 * reap 1 frame from @swhead 321 * 322 * Safe to call from IRQ 323 */ 324 static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil, 325 struct vring *vring) 326 { 327 struct device *dev = wil_to_dev(wil); 328 struct net_device *ndev = wil_to_ndev(wil); 329 volatile struct vring_rx_desc *d; 330 struct sk_buff *skb; 331 dma_addr_t pa; 332 unsigned int sz = RX_BUF_LEN; 333 u8 ftype; 334 u8 ds_bits; 335 336 if (wil_vring_is_empty(vring)) 337 return NULL; 338 339 d = &(vring->va[vring->swhead].rx); 340 if (!(d->dma.status & RX_DMA_STATUS_DU)) { 341 /* it is not error, we just reached end of Rx done area */ 342 return NULL; 343 } 344 345 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); 346 skb = vring->ctx[vring->swhead]; 347 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE); 348 skb_trim(skb, d->dma.length); 349 350 wil->stats.last_mcs_rx = wil_rxdesc_mcs(d); 351 352 /* use radiotap header only if required */ 353 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP) 354 wil_rx_add_radiotap_header(wil, skb, d); 355 356 wil_dbg_TXRX(wil, "Rx[%3d] : %d bytes\n", vring->swhead, d->dma.length); 357 wil_hex_dump_TXRX("Rx ", DUMP_PREFIX_NONE, 32, 4, 358 (const void *)d, sizeof(*d), false); 359 360 wil_vring_advance_head(vring, 1); 361 362 /* no extra checks if in sniffer mode */ 363 if (ndev->type != ARPHRD_ETHER) 364 return skb; 365 /* 366 * Non-data frames may be delivered through Rx DMA channel (ex: BAR) 367 * Driver should recognize it by frame type, that is found 368 * in Rx descriptor. If type is not data, it is 802.11 frame as is 369 */ 370 ftype = wil_rxdesc_ftype(d) << 2; 371 if (ftype != IEEE80211_FTYPE_DATA) { 372 wil_dbg_TXRX(wil, "Non-data frame ftype 0x%08x\n", ftype); 373 /* TODO: process it */ 374 kfree_skb(skb); 375 return NULL; 376 } 377 378 if (skb->len < ETH_HLEN) { 379 wil_err(wil, "Short frame, len = %d\n", skb->len); 380 /* TODO: process it (i.e. BAR) */ 381 kfree_skb(skb); 382 return NULL; 383 } 384 385 ds_bits = wil_rxdesc_ds_bits(d); 386 if (ds_bits == 1) { 387 /* 388 * HW bug - in ToDS mode, i.e. Rx on AP side, 389 * addresses get swapped 390 */ 391 wil_swap_ethaddr(skb->data); 392 } 393 394 return skb; 395 } 396 397 /** 398 * allocate and fill up to @count buffers in rx ring 399 * buffers posted at @swtail 400 */ 401 static int wil_rx_refill(struct wil6210_priv *wil, int count) 402 { 403 struct net_device *ndev = wil_to_ndev(wil); 404 struct vring *v = &wil->vring_rx; 405 u32 next_tail; 406 int rc = 0; 407 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ? 408 WIL6210_RTAP_SIZE : 0; 409 410 for (; next_tail = wil_vring_next_tail(v), 411 (next_tail != v->swhead) && (count-- > 0); 412 v->swtail = next_tail) { 413 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom); 414 if (rc) { 415 wil_err(wil, "Error %d in wil_rx_refill[%d]\n", 416 rc, v->swtail); 417 break; 418 } 419 } 420 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail)); 421 422 return rc; 423 } 424 425 /* 426 * Pass Rx packet to the netif. Update statistics. 427 */ 428 static void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev) 429 { 430 int rc; 431 unsigned int len = skb->len; 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 skb_orphan(skb); 468 469 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { 470 skb->dev = ndev; 471 skb_reset_mac_header(skb); 472 skb->ip_summed = CHECKSUM_UNNECESSARY; 473 skb->pkt_type = PACKET_OTHERHOST; 474 skb->protocol = htons(ETH_P_802_2); 475 476 } else { 477 skb->protocol = eth_type_trans(skb, ndev); 478 } 479 480 wil_netif_rx_any(skb, ndev); 481 } 482 wil_rx_refill(wil, v->size); 483 } 484 485 int wil_rx_init(struct wil6210_priv *wil) 486 { 487 struct net_device *ndev = wil_to_ndev(wil); 488 struct wireless_dev *wdev = wil->wdev; 489 struct vring *vring = &wil->vring_rx; 490 int rc; 491 struct wmi_cfg_rx_chain_cmd cmd = { 492 .action = WMI_RX_CHAIN_ADD, 493 .rx_sw_ring = { 494 .max_mpdu_size = cpu_to_le16(RX_BUF_LEN), 495 }, 496 .mid = 0, /* TODO - what is it? */ 497 .decap_trans_type = WMI_DECAP_TYPE_802_3, 498 }; 499 struct { 500 struct wil6210_mbox_hdr_wmi wmi; 501 struct wmi_cfg_rx_chain_done_event evt; 502 } __packed evt; 503 504 vring->size = WIL6210_RX_RING_SIZE; 505 rc = wil_vring_alloc(wil, vring); 506 if (rc) 507 return rc; 508 509 cmd.rx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); 510 cmd.rx_sw_ring.ring_size = cpu_to_le16(vring->size); 511 if (wdev->iftype == NL80211_IFTYPE_MONITOR) { 512 struct ieee80211_channel *ch = wdev->preset_chandef.chan; 513 514 cmd.sniffer_cfg.mode = cpu_to_le32(WMI_SNIFFER_ON); 515 if (ch) 516 cmd.sniffer_cfg.channel = ch->hw_value - 1; 517 cmd.sniffer_cfg.phy_info_mode = 518 cpu_to_le32(ndev->type == ARPHRD_IEEE80211_RADIOTAP); 519 cmd.sniffer_cfg.phy_support = 520 cpu_to_le32((wil->monitor_flags & MONITOR_FLAG_CONTROL) 521 ? WMI_SNIFFER_CP : WMI_SNIFFER_DP); 522 } 523 /* typical time for secure PCP is 840ms */ 524 rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd), 525 WMI_CFG_RX_CHAIN_DONE_EVENTID, &evt, sizeof(evt), 2000); 526 if (rc) 527 goto err_free; 528 529 vring->hwtail = le32_to_cpu(evt.evt.rx_ring_tail_ptr); 530 531 wil_dbg(wil, "Rx init: status %d tail 0x%08x\n", 532 le32_to_cpu(evt.evt.status), vring->hwtail); 533 534 rc = wil_rx_refill(wil, vring->size); 535 if (rc) 536 goto err_free; 537 538 return 0; 539 err_free: 540 wil_vring_free(wil, vring, 0); 541 542 return rc; 543 } 544 545 void wil_rx_fini(struct wil6210_priv *wil) 546 { 547 struct vring *vring = &wil->vring_rx; 548 549 if (vring->va) { 550 int rc; 551 struct wmi_cfg_rx_chain_cmd cmd = { 552 .action = cpu_to_le32(WMI_RX_CHAIN_DEL), 553 .rx_sw_ring = { 554 .max_mpdu_size = cpu_to_le16(RX_BUF_LEN), 555 }, 556 }; 557 struct { 558 struct wil6210_mbox_hdr_wmi wmi; 559 struct wmi_cfg_rx_chain_done_event cfg; 560 } __packed wmi_rx_cfg_reply; 561 562 rc = wmi_call(wil, WMI_CFG_RX_CHAIN_CMDID, &cmd, sizeof(cmd), 563 WMI_CFG_RX_CHAIN_DONE_EVENTID, 564 &wmi_rx_cfg_reply, sizeof(wmi_rx_cfg_reply), 565 100); 566 wil_vring_free(wil, vring, 0); 567 } 568 } 569 570 int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size, 571 int cid, int tid) 572 { 573 int rc; 574 struct wmi_vring_cfg_cmd cmd = { 575 .action = cpu_to_le32(WMI_VRING_CMD_ADD), 576 .vring_cfg = { 577 .tx_sw_ring = { 578 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN), 579 }, 580 .ringid = id, 581 .cidxtid = (cid & 0xf) | ((tid & 0xf) << 4), 582 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3, 583 .mac_ctrl = 0, 584 .to_resolution = 0, 585 .agg_max_wsize = 16, 586 .schd_params = { 587 .priority = cpu_to_le16(0), 588 .timeslot_us = cpu_to_le16(0xfff), 589 }, 590 }, 591 }; 592 struct { 593 struct wil6210_mbox_hdr_wmi wmi; 594 struct wmi_vring_cfg_done_event cmd; 595 } __packed reply; 596 struct vring *vring = &wil->vring_tx[id]; 597 598 if (vring->va) { 599 wil_err(wil, "Tx ring [%d] already allocated\n", id); 600 rc = -EINVAL; 601 goto out; 602 } 603 604 vring->size = size; 605 rc = wil_vring_alloc(wil, vring); 606 if (rc) 607 goto out; 608 609 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa); 610 cmd.vring_cfg.tx_sw_ring.ring_size = cpu_to_le16(vring->size); 611 612 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd), 613 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100); 614 if (rc) 615 goto out_free; 616 617 if (reply.cmd.status != WMI_VRING_CFG_SUCCESS) { 618 wil_err(wil, "Tx config failed, status 0x%02x\n", 619 reply.cmd.status); 620 goto out_free; 621 } 622 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr); 623 624 return 0; 625 out_free: 626 wil_vring_free(wil, vring, 1); 627 out: 628 629 return rc; 630 } 631 632 void wil_vring_fini_tx(struct wil6210_priv *wil, int id) 633 { 634 struct vring *vring = &wil->vring_tx[id]; 635 636 if (!vring->va) 637 return; 638 639 wil_vring_free(wil, vring, 1); 640 } 641 642 static struct vring *wil_find_tx_vring(struct wil6210_priv *wil, 643 struct sk_buff *skb) 644 { 645 struct vring *v = &wil->vring_tx[0]; 646 647 if (v->va) 648 return v; 649 650 return NULL; 651 } 652 653 static int wil_tx_desc_map(volatile struct vring_tx_desc *d, 654 dma_addr_t pa, u32 len) 655 { 656 d->dma.addr_low = lower_32_bits(pa); 657 d->dma.addr_high = (u16)upper_32_bits(pa); 658 d->dma.ip_length = 0; 659 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/ 660 d->dma.b11 = 0/*14 | BIT(7)*/; 661 d->dma.error = 0; 662 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */ 663 d->dma.length = len; 664 d->dma.d0 = 0; 665 d->mac.d[0] = 0; 666 d->mac.d[1] = 0; 667 d->mac.d[2] = 0; 668 d->mac.ucode_cmd = 0; 669 /* use dst index 0 */ 670 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) | 671 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS); 672 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */ 673 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) | 674 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS); 675 676 return 0; 677 } 678 679 static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring, 680 struct sk_buff *skb) 681 { 682 struct device *dev = wil_to_dev(wil); 683 volatile struct vring_tx_desc *d; 684 u32 swhead = vring->swhead; 685 int avail = wil_vring_avail_tx(vring); 686 int nr_frags = skb_shinfo(skb)->nr_frags; 687 uint f; 688 int vring_index = vring - wil->vring_tx; 689 uint i = swhead; 690 dma_addr_t pa; 691 692 wil_dbg_TXRX(wil, "%s()\n", __func__); 693 694 if (avail < vring->size/8) 695 netif_tx_stop_all_queues(wil_to_ndev(wil)); 696 if (avail < 1 + nr_frags) { 697 wil_err(wil, "Tx ring full. No space for %d fragments\n", 698 1 + nr_frags); 699 return -ENOMEM; 700 } 701 d = &(vring->va[i].tx); 702 703 /* FIXME FW can accept only unicast frames for the peer */ 704 memcpy(skb->data, wil->dst_addr[vring_index], ETH_ALEN); 705 706 pa = dma_map_single(dev, skb->data, 707 skb_headlen(skb), DMA_TO_DEVICE); 708 709 wil_dbg_TXRX(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb), 710 skb->data, (unsigned long long)pa); 711 wil_hex_dump_TXRX("Tx ", DUMP_PREFIX_OFFSET, 16, 1, 712 skb->data, skb_headlen(skb), false); 713 714 if (unlikely(dma_mapping_error(dev, pa))) 715 return -EINVAL; 716 /* 1-st segment */ 717 wil_tx_desc_map(d, pa, skb_headlen(skb)); 718 d->mac.d[2] |= ((nr_frags + 1) << 719 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS); 720 /* middle segments */ 721 for (f = 0; f < nr_frags; f++) { 722 const struct skb_frag_struct *frag = 723 &skb_shinfo(skb)->frags[f]; 724 int len = skb_frag_size(frag); 725 i = (swhead + f + 1) % vring->size; 726 d = &(vring->va[i].tx); 727 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag), 728 DMA_TO_DEVICE); 729 if (unlikely(dma_mapping_error(dev, pa))) 730 goto dma_error; 731 wil_tx_desc_map(d, pa, len); 732 vring->ctx[i] = NULL; 733 } 734 /* for the last seg only */ 735 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS); 736 d->dma.d0 |= BIT(9); /* BUG: undocumented bit */ 737 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS); 738 d->dma.d0 |= (vring_index << DMA_CFG_DESC_TX_0_QID_POS); 739 740 wil_hex_dump_TXRX("Tx ", DUMP_PREFIX_NONE, 32, 4, 741 (const void *)d, sizeof(*d), false); 742 743 /* advance swhead */ 744 wil_vring_advance_head(vring, nr_frags + 1); 745 wil_dbg_TXRX(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead); 746 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail)); 747 /* hold reference to skb 748 * to prevent skb release before accounting 749 * in case of immediate "tx done" 750 */ 751 vring->ctx[i] = skb_get(skb); 752 753 return 0; 754 dma_error: 755 /* unmap what we have mapped */ 756 /* Note: increment @f to operate with positive index */ 757 for (f++; f > 0; f--) { 758 i = (swhead + f) % vring->size; 759 d = &(vring->va[i].tx); 760 d->dma.status = TX_DMA_STATUS_DU; 761 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); 762 if (vring->ctx[i]) 763 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE); 764 else 765 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE); 766 } 767 768 return -EINVAL; 769 } 770 771 772 netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev) 773 { 774 struct wil6210_priv *wil = ndev_to_wil(ndev); 775 struct vring *vring; 776 int rc; 777 778 wil_dbg_TXRX(wil, "%s()\n", __func__); 779 if (!test_bit(wil_status_fwready, &wil->status)) { 780 wil_err(wil, "FW not ready\n"); 781 goto drop; 782 } 783 if (!test_bit(wil_status_fwconnected, &wil->status)) { 784 wil_err(wil, "FW not connected\n"); 785 goto drop; 786 } 787 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) { 788 wil_err(wil, "Xmit in monitor mode not supported\n"); 789 goto drop; 790 } 791 if (skb->protocol == cpu_to_be16(ETH_P_PAE)) { 792 rc = wmi_tx_eapol(wil, skb); 793 } else { 794 /* find vring */ 795 vring = wil_find_tx_vring(wil, skb); 796 if (!vring) { 797 wil_err(wil, "No Tx VRING available\n"); 798 goto drop; 799 } 800 /* set up vring entry */ 801 rc = wil_tx_vring(wil, vring, skb); 802 } 803 switch (rc) { 804 case 0: 805 ndev->stats.tx_packets++; 806 ndev->stats.tx_bytes += skb->len; 807 dev_kfree_skb_any(skb); 808 return NETDEV_TX_OK; 809 case -ENOMEM: 810 return NETDEV_TX_BUSY; 811 default: 812 ; /* goto drop; */ 813 break; 814 } 815 drop: 816 netif_tx_stop_all_queues(ndev); 817 ndev->stats.tx_dropped++; 818 dev_kfree_skb_any(skb); 819 820 return NET_XMIT_DROP; 821 } 822 823 /** 824 * Clean up transmitted skb's from the Tx VRING 825 * 826 * Safe to call from IRQ 827 */ 828 void wil_tx_complete(struct wil6210_priv *wil, int ringid) 829 { 830 struct device *dev = wil_to_dev(wil); 831 struct vring *vring = &wil->vring_tx[ringid]; 832 833 if (!vring->va) { 834 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid); 835 return; 836 } 837 838 wil_dbg_TXRX(wil, "%s(%d)\n", __func__, ringid); 839 840 while (!wil_vring_is_empty(vring)) { 841 volatile struct vring_tx_desc *d = &vring->va[vring->swtail].tx; 842 dma_addr_t pa; 843 struct sk_buff *skb; 844 if (!(d->dma.status & TX_DMA_STATUS_DU)) 845 break; 846 847 wil_dbg_TXRX(wil, 848 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n", 849 vring->swtail, d->dma.length, d->dma.status, 850 d->dma.error); 851 wil_hex_dump_TXRX("TxC ", DUMP_PREFIX_NONE, 32, 4, 852 (const void *)d, sizeof(*d), false); 853 854 pa = d->dma.addr_low | ((u64)d->dma.addr_high << 32); 855 skb = vring->ctx[vring->swtail]; 856 if (skb) { 857 dma_unmap_single(dev, pa, d->dma.length, DMA_TO_DEVICE); 858 dev_kfree_skb_any(skb); 859 vring->ctx[vring->swtail] = NULL; 860 } else { 861 dma_unmap_page(dev, pa, d->dma.length, DMA_TO_DEVICE); 862 } 863 d->dma.addr_low = 0; 864 d->dma.addr_high = 0; 865 d->dma.length = 0; 866 d->dma.status = TX_DMA_STATUS_DU; 867 vring->swtail = wil_vring_next_tail(vring); 868 } 869 if (wil_vring_avail_tx(vring) > vring->size/4) 870 netif_tx_wake_all_queues(wil_to_ndev(wil)); 871 } 872