1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * NXP Wireless LAN device driver: AP TX and RX data handling 4 * 5 * Copyright 2011-2020 NXP 6 */ 7 8 #include "decl.h" 9 #include "ioctl.h" 10 #include "main.h" 11 #include "wmm.h" 12 #include "11n_aggr.h" 13 #include "11n_rxreorder.h" 14 15 /* This function checks if particular RA list has packets more than low bridge 16 * packet threshold and then deletes packet from this RA list. 17 * Function deletes packets from such RA list and returns true. If no such list 18 * is found, false is returned. 19 */ 20 static bool 21 mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv, 22 struct list_head *ra_list_head, 23 int tid) 24 { 25 struct mwifiex_ra_list_tbl *ra_list; 26 struct sk_buff *skb, *tmp; 27 bool pkt_deleted = false; 28 struct mwifiex_txinfo *tx_info; 29 struct mwifiex_adapter *adapter = priv->adapter; 30 31 list_for_each_entry(ra_list, ra_list_head, list) { 32 if (skb_queue_empty(&ra_list->skb_head)) 33 continue; 34 35 skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) { 36 tx_info = MWIFIEX_SKB_TXCB(skb); 37 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) { 38 __skb_unlink(skb, &ra_list->skb_head); 39 mwifiex_write_data_complete(adapter, skb, 0, 40 -1); 41 if (ra_list->tx_paused) 42 priv->wmm.pkts_paused[tid]--; 43 else 44 atomic_dec(&priv->wmm.tx_pkts_queued); 45 pkt_deleted = true; 46 } 47 if ((atomic_read(&adapter->pending_bridged_pkts) <= 48 MWIFIEX_BRIDGED_PKTS_THR_LOW)) 49 break; 50 } 51 } 52 53 return pkt_deleted; 54 } 55 56 /* This function deletes packets from particular RA List. RA list index 57 * from which packets are deleted is preserved so that packets from next RA 58 * list are deleted upon subsequent call thus maintaining fairness. 59 */ 60 static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv) 61 { 62 struct list_head *ra_list; 63 int i; 64 65 spin_lock_bh(&priv->wmm.ra_list_spinlock); 66 67 for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) { 68 if (priv->del_list_idx == MAX_NUM_TID) 69 priv->del_list_idx = 0; 70 ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list; 71 if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list, i)) { 72 priv->del_list_idx++; 73 break; 74 } 75 } 76 77 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 78 } 79 80 81 static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv, 82 struct sk_buff *skb) 83 { 84 struct mwifiex_adapter *adapter = priv->adapter; 85 struct uap_rxpd *uap_rx_pd; 86 struct rx_packet_hdr *rx_pkt_hdr; 87 struct sk_buff *new_skb; 88 struct mwifiex_txinfo *tx_info; 89 int hdr_chop; 90 struct ethhdr *p_ethhdr; 91 struct mwifiex_sta_node *src_node; 92 int index; 93 94 uap_rx_pd = (struct uap_rxpd *)(skb->data); 95 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 96 97 if ((atomic_read(&adapter->pending_bridged_pkts) >= 98 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { 99 mwifiex_dbg(priv->adapter, ERROR, 100 "Tx: Bridge packet limit reached. Drop packet!\n"); 101 kfree_skb(skb); 102 mwifiex_uap_cleanup_tx_queues(priv); 103 return; 104 } 105 106 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, 107 sizeof(bridge_tunnel_header))) || 108 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, 109 sizeof(rfc1042_header)) && 110 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && 111 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { 112 /* Replace the 803 header and rfc1042 header (llc/snap) with 113 * an Ethernet II header, keep the src/dst and snap_type 114 * (ethertype). 115 * 116 * The firmware only passes up SNAP frames converting all RX 117 * data from 802.11 to 802.2/LLC/SNAP frames. 118 * 119 * To create the Ethernet II, just move the src, dst address 120 * right before the snap_type. 121 */ 122 p_ethhdr = (struct ethhdr *) 123 ((u8 *)(&rx_pkt_hdr->eth803_hdr) 124 + sizeof(rx_pkt_hdr->eth803_hdr) 125 + sizeof(rx_pkt_hdr->rfc1042_hdr) 126 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) 127 - sizeof(rx_pkt_hdr->eth803_hdr.h_source) 128 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); 129 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source, 130 sizeof(p_ethhdr->h_source)); 131 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, 132 sizeof(p_ethhdr->h_dest)); 133 /* Chop off the rxpd + the excess memory from 134 * 802.2/llc/snap header that was removed. 135 */ 136 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd; 137 } else { 138 /* Chop off the rxpd */ 139 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd; 140 } 141 142 /* Chop off the leading header bytes so that it points 143 * to the start of either the reconstructed EthII frame 144 * or the 802.2/llc/snap frame. 145 */ 146 skb_pull(skb, hdr_chop); 147 148 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) { 149 mwifiex_dbg(priv->adapter, ERROR, 150 "data: Tx: insufficient skb headroom %d\n", 151 skb_headroom(skb)); 152 /* Insufficient skb headroom - allocate a new skb */ 153 new_skb = 154 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); 155 if (unlikely(!new_skb)) { 156 mwifiex_dbg(priv->adapter, ERROR, 157 "Tx: cannot allocate new_skb\n"); 158 kfree_skb(skb); 159 priv->stats.tx_dropped++; 160 return; 161 } 162 163 kfree_skb(skb); 164 skb = new_skb; 165 mwifiex_dbg(priv->adapter, INFO, 166 "info: new skb headroom %d\n", 167 skb_headroom(skb)); 168 } 169 170 tx_info = MWIFIEX_SKB_TXCB(skb); 171 memset(tx_info, 0, sizeof(*tx_info)); 172 tx_info->bss_num = priv->bss_num; 173 tx_info->bss_type = priv->bss_type; 174 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; 175 176 src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source); 177 if (src_node) { 178 src_node->stats.last_rx = jiffies; 179 src_node->stats.rx_bytes += skb->len; 180 src_node->stats.rx_packets++; 181 src_node->stats.last_tx_rate = uap_rx_pd->rx_rate; 182 src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info; 183 } 184 185 if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) { 186 /* Update bridge packet statistics as the 187 * packet is not going to kernel/upper layer. 188 */ 189 priv->stats.rx_bytes += skb->len; 190 priv->stats.rx_packets++; 191 192 /* Sending bridge packet to TX queue, so save the packet 193 * length in TXCB to update statistics in TX complete. 194 */ 195 tx_info->pkt_len = skb->len; 196 } 197 198 __net_timestamp(skb); 199 200 index = mwifiex_1d_to_wmm_queue[skb->priority]; 201 atomic_inc(&priv->wmm_tx_pending[index]); 202 mwifiex_wmm_add_buf_txqueue(priv, skb); 203 atomic_inc(&adapter->tx_pending); 204 atomic_inc(&adapter->pending_bridged_pkts); 205 206 mwifiex_queue_main_work(priv->adapter); 207 208 return; 209 } 210 211 /* 212 * This function contains logic for AP packet forwarding. 213 * 214 * If a packet is multicast/broadcast, it is sent to kernel/upper layer 215 * as well as queued back to AP TX queue so that it can be sent to other 216 * associated stations. 217 * If a packet is unicast and RA is present in associated station list, 218 * it is again requeued into AP TX queue. 219 * If a packet is unicast and RA is not in associated station list, 220 * packet is forwarded to kernel to handle routing logic. 221 */ 222 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv, 223 struct sk_buff *skb) 224 { 225 struct mwifiex_adapter *adapter = priv->adapter; 226 struct uap_rxpd *uap_rx_pd; 227 struct rx_packet_hdr *rx_pkt_hdr; 228 u8 ra[ETH_ALEN]; 229 struct sk_buff *skb_uap; 230 231 uap_rx_pd = (struct uap_rxpd *)(skb->data); 232 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 233 234 /* don't do packet forwarding in disconnected state */ 235 if (!priv->media_connected) { 236 mwifiex_dbg(adapter, ERROR, 237 "drop packet in disconnected state.\n"); 238 dev_kfree_skb_any(skb); 239 return 0; 240 } 241 242 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN); 243 244 if (is_multicast_ether_addr(ra)) { 245 skb_uap = skb_copy(skb, GFP_ATOMIC); 246 mwifiex_uap_queue_bridged_pkt(priv, skb_uap); 247 } else { 248 if (mwifiex_get_sta_entry(priv, ra)) { 249 /* Requeue Intra-BSS packet */ 250 mwifiex_uap_queue_bridged_pkt(priv, skb); 251 return 0; 252 } 253 } 254 255 /* Forward unicat/Inter-BSS packets to kernel. */ 256 return mwifiex_process_rx_packet(priv, skb); 257 } 258 259 int mwifiex_uap_recv_packet(struct mwifiex_private *priv, 260 struct sk_buff *skb) 261 { 262 struct mwifiex_adapter *adapter = priv->adapter; 263 struct mwifiex_sta_node *src_node; 264 struct ethhdr *p_ethhdr; 265 struct sk_buff *skb_uap; 266 struct mwifiex_txinfo *tx_info; 267 268 if (!skb) 269 return -1; 270 271 p_ethhdr = (void *)skb->data; 272 src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source); 273 if (src_node) { 274 src_node->stats.last_rx = jiffies; 275 src_node->stats.rx_bytes += skb->len; 276 src_node->stats.rx_packets++; 277 } 278 279 if (is_multicast_ether_addr(p_ethhdr->h_dest) || 280 mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) { 281 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) 282 skb_uap = 283 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); 284 else 285 skb_uap = skb_copy(skb, GFP_ATOMIC); 286 287 if (likely(skb_uap)) { 288 tx_info = MWIFIEX_SKB_TXCB(skb_uap); 289 memset(tx_info, 0, sizeof(*tx_info)); 290 tx_info->bss_num = priv->bss_num; 291 tx_info->bss_type = priv->bss_type; 292 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; 293 __net_timestamp(skb_uap); 294 mwifiex_wmm_add_buf_txqueue(priv, skb_uap); 295 atomic_inc(&adapter->tx_pending); 296 atomic_inc(&adapter->pending_bridged_pkts); 297 if ((atomic_read(&adapter->pending_bridged_pkts) >= 298 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { 299 mwifiex_dbg(adapter, ERROR, 300 "Tx: Bridge packet limit reached. Drop packet!\n"); 301 mwifiex_uap_cleanup_tx_queues(priv); 302 } 303 304 } else { 305 mwifiex_dbg(adapter, ERROR, "failed to allocate skb_uap"); 306 } 307 308 mwifiex_queue_main_work(adapter); 309 /* Don't forward Intra-BSS unicast packet to upper layer*/ 310 if (mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) 311 return 0; 312 } 313 314 skb->dev = priv->netdev; 315 skb->protocol = eth_type_trans(skb, priv->netdev); 316 skb->ip_summed = CHECKSUM_NONE; 317 318 /* This is required only in case of 11n and USB/PCIE as we alloc 319 * a buffer of 4K only if its 11N (to be able to receive 4K 320 * AMSDU packets). In case of SD we allocate buffers based 321 * on the size of packet and hence this is not needed. 322 * 323 * Modifying the truesize here as our allocation for each 324 * skb is 4K but we only receive 2K packets and this cause 325 * the kernel to start dropping packets in case where 326 * application has allocated buffer based on 2K size i.e. 327 * if there a 64K packet received (in IP fragments and 328 * application allocates 64K to receive this packet but 329 * this packet would almost double up because we allocate 330 * each 1.5K fragment in 4K and pass it up. As soon as the 331 * 64K limit hits kernel will start to drop rest of the 332 * fragments. Currently we fail the Filesndl-ht.scr script 333 * for UDP, hence this fix 334 */ 335 if ((adapter->iface_type == MWIFIEX_USB || 336 adapter->iface_type == MWIFIEX_PCIE) && 337 skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE) 338 skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE); 339 340 /* Forward multicast/broadcast packet to upper layer*/ 341 netif_rx(skb); 342 return 0; 343 } 344 345 /* 346 * This function processes the packet received on AP interface. 347 * 348 * The function looks into the RxPD and performs sanity tests on the 349 * received buffer to ensure its a valid packet before processing it 350 * further. If the packet is determined to be aggregated, it is 351 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic. 352 * 353 * The completion callback is called after processing is complete. 354 */ 355 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv, 356 struct sk_buff *skb) 357 { 358 struct mwifiex_adapter *adapter = priv->adapter; 359 int ret; 360 struct uap_rxpd *uap_rx_pd; 361 struct rx_packet_hdr *rx_pkt_hdr; 362 u16 rx_pkt_type; 363 u8 ta[ETH_ALEN], pkt_type; 364 struct mwifiex_sta_node *node; 365 366 uap_rx_pd = (struct uap_rxpd *)(skb->data); 367 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type); 368 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 369 370 ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source); 371 372 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) + 373 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) { 374 mwifiex_dbg(adapter, ERROR, 375 "wrong rx packet: len=%d, offset=%d, length=%d\n", 376 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset), 377 le16_to_cpu(uap_rx_pd->rx_pkt_length)); 378 priv->stats.rx_dropped++; 379 380 node = mwifiex_get_sta_entry(priv, ta); 381 if (node) 382 node->stats.tx_failed++; 383 384 dev_kfree_skb_any(skb); 385 return 0; 386 } 387 388 if (rx_pkt_type == PKT_TYPE_MGMT) { 389 ret = mwifiex_process_mgmt_packet(priv, skb); 390 if (ret) 391 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed"); 392 dev_kfree_skb_any(skb); 393 return ret; 394 } 395 396 397 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) { 398 spin_lock_bh(&priv->sta_list_spinlock); 399 node = mwifiex_get_sta_entry(priv, ta); 400 if (node) 401 node->rx_seq[uap_rx_pd->priority] = 402 le16_to_cpu(uap_rx_pd->seq_num); 403 spin_unlock_bh(&priv->sta_list_spinlock); 404 } 405 406 if (!priv->ap_11n_enabled || 407 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) && 408 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) { 409 ret = mwifiex_handle_uap_rx_forward(priv, skb); 410 return ret; 411 } 412 413 /* Reorder and send to kernel */ 414 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type); 415 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num), 416 uap_rx_pd->priority, ta, pkt_type, 417 skb); 418 419 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 420 dev_kfree_skb_any(skb); 421 422 if (ret) 423 priv->stats.rx_dropped++; 424 425 return ret; 426 } 427 428 /* 429 * This function fills the TxPD for AP tx packets. 430 * 431 * The Tx buffer received by this function should already have the 432 * header space allocated for TxPD. 433 * 434 * This function inserts the TxPD in between interface header and actual 435 * data and adjusts the buffer pointers accordingly. 436 * 437 * The following TxPD fields are set by this function, as required - 438 * - BSS number 439 * - Tx packet length and offset 440 * - Priority 441 * - Packet delay 442 * - Priority specific Tx control 443 * - Flags 444 */ 445 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv, 446 struct sk_buff *skb) 447 { 448 struct mwifiex_adapter *adapter = priv->adapter; 449 struct uap_txpd *txpd; 450 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); 451 int pad; 452 u16 pkt_type, pkt_offset; 453 int hroom = adapter->intf_hdr_len; 454 455 if (!skb->len) { 456 mwifiex_dbg(adapter, ERROR, 457 "Tx: bad packet length: %d\n", skb->len); 458 tx_info->status_code = -1; 459 return skb->data; 460 } 461 462 BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN); 463 464 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0; 465 466 pad = ((uintptr_t)skb->data - (sizeof(*txpd) + hroom)) & 467 (MWIFIEX_DMA_ALIGN_SZ - 1); 468 469 skb_push(skb, sizeof(*txpd) + pad); 470 471 txpd = (struct uap_txpd *)skb->data; 472 memset(txpd, 0, sizeof(*txpd)); 473 txpd->bss_num = priv->bss_num; 474 txpd->bss_type = priv->bss_type; 475 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) + 476 pad))); 477 txpd->priority = (u8)skb->priority; 478 479 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 480 481 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS || 482 tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) { 483 txpd->tx_token_id = tx_info->ack_frame_id; 484 txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS; 485 } 486 487 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) 488 /* 489 * Set the priority specific tx_control field, setting of 0 will 490 * cause the default value to be used later in this function. 491 */ 492 txpd->tx_control = 493 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]); 494 495 /* Offset of actual data */ 496 pkt_offset = sizeof(*txpd) + pad; 497 if (pkt_type == PKT_TYPE_MGMT) { 498 /* Set the packet type and add header for management frame */ 499 txpd->tx_pkt_type = cpu_to_le16(pkt_type); 500 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE; 501 } 502 503 txpd->tx_pkt_offset = cpu_to_le16(pkt_offset); 504 505 /* make space for adapter->intf_hdr_len */ 506 skb_push(skb, hroom); 507 508 if (!txpd->tx_control) 509 /* TxCtrl set by user or default */ 510 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 511 512 return skb->data; 513 } 514