1 /* 2 * NXP Wireless LAN device driver: AP TX and RX data handling 3 * 4 * Copyright 2011-2020 NXP 5 * 6 * This software file (the "File") is distributed by NXP 7 * under the terms of the GNU General Public License Version 2, June 1991 8 * (the "License"). You may use, redistribute and/or modify this File in 9 * accordance with the terms and conditions of the License, a copy of which 10 * is available by writing to the Free Software Foundation, Inc., 11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the 12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. 13 * 14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE 16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about 17 * this warranty disclaimer. 18 */ 19 20 #include "decl.h" 21 #include "ioctl.h" 22 #include "main.h" 23 #include "wmm.h" 24 #include "11n_aggr.h" 25 #include "11n_rxreorder.h" 26 27 /* This function checks if particular RA list has packets more than low bridge 28 * packet threshold and then deletes packet from this RA list. 29 * Function deletes packets from such RA list and returns true. If no such list 30 * is found, false is returned. 31 */ 32 static bool 33 mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv, 34 struct list_head *ra_list_head, 35 int tid) 36 { 37 struct mwifiex_ra_list_tbl *ra_list; 38 struct sk_buff *skb, *tmp; 39 bool pkt_deleted = false; 40 struct mwifiex_txinfo *tx_info; 41 struct mwifiex_adapter *adapter = priv->adapter; 42 43 list_for_each_entry(ra_list, ra_list_head, list) { 44 if (skb_queue_empty(&ra_list->skb_head)) 45 continue; 46 47 skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) { 48 tx_info = MWIFIEX_SKB_TXCB(skb); 49 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) { 50 __skb_unlink(skb, &ra_list->skb_head); 51 mwifiex_write_data_complete(adapter, skb, 0, 52 -1); 53 if (ra_list->tx_paused) 54 priv->wmm.pkts_paused[tid]--; 55 else 56 atomic_dec(&priv->wmm.tx_pkts_queued); 57 pkt_deleted = true; 58 } 59 if ((atomic_read(&adapter->pending_bridged_pkts) <= 60 MWIFIEX_BRIDGED_PKTS_THR_LOW)) 61 break; 62 } 63 } 64 65 return pkt_deleted; 66 } 67 68 /* This function deletes packets from particular RA List. RA list index 69 * from which packets are deleted is preserved so that packets from next RA 70 * list are deleted upon subsequent call thus maintaining fairness. 71 */ 72 static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv) 73 { 74 struct list_head *ra_list; 75 int i; 76 77 spin_lock_bh(&priv->wmm.ra_list_spinlock); 78 79 for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) { 80 if (priv->del_list_idx == MAX_NUM_TID) 81 priv->del_list_idx = 0; 82 ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list; 83 if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list, i)) { 84 priv->del_list_idx++; 85 break; 86 } 87 } 88 89 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 90 } 91 92 93 static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv, 94 struct sk_buff *skb) 95 { 96 struct mwifiex_adapter *adapter = priv->adapter; 97 struct uap_rxpd *uap_rx_pd; 98 struct rx_packet_hdr *rx_pkt_hdr; 99 struct sk_buff *new_skb; 100 struct mwifiex_txinfo *tx_info; 101 int hdr_chop; 102 struct ethhdr *p_ethhdr; 103 struct mwifiex_sta_node *src_node; 104 int index; 105 106 uap_rx_pd = (struct uap_rxpd *)(skb->data); 107 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 108 109 if ((atomic_read(&adapter->pending_bridged_pkts) >= 110 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { 111 mwifiex_dbg(priv->adapter, ERROR, 112 "Tx: Bridge packet limit reached. Drop packet!\n"); 113 kfree_skb(skb); 114 mwifiex_uap_cleanup_tx_queues(priv); 115 return; 116 } 117 118 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, 119 sizeof(bridge_tunnel_header))) || 120 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, 121 sizeof(rfc1042_header)) && 122 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && 123 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { 124 /* Replace the 803 header and rfc1042 header (llc/snap) with 125 * an Ethernet II header, keep the src/dst and snap_type 126 * (ethertype). 127 * 128 * The firmware only passes up SNAP frames converting all RX 129 * data from 802.11 to 802.2/LLC/SNAP frames. 130 * 131 * To create the Ethernet II, just move the src, dst address 132 * right before the snap_type. 133 */ 134 p_ethhdr = (struct ethhdr *) 135 ((u8 *)(&rx_pkt_hdr->eth803_hdr) 136 + sizeof(rx_pkt_hdr->eth803_hdr) 137 + sizeof(rx_pkt_hdr->rfc1042_hdr) 138 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) 139 - sizeof(rx_pkt_hdr->eth803_hdr.h_source) 140 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); 141 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source, 142 sizeof(p_ethhdr->h_source)); 143 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, 144 sizeof(p_ethhdr->h_dest)); 145 /* Chop off the rxpd + the excess memory from 146 * 802.2/llc/snap header that was removed. 147 */ 148 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd; 149 } else { 150 /* Chop off the rxpd */ 151 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd; 152 } 153 154 /* Chop off the leading header bytes so that it points 155 * to the start of either the reconstructed EthII frame 156 * or the 802.2/llc/snap frame. 157 */ 158 skb_pull(skb, hdr_chop); 159 160 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) { 161 mwifiex_dbg(priv->adapter, ERROR, 162 "data: Tx: insufficient skb headroom %d\n", 163 skb_headroom(skb)); 164 /* Insufficient skb headroom - allocate a new skb */ 165 new_skb = 166 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); 167 if (unlikely(!new_skb)) { 168 mwifiex_dbg(priv->adapter, ERROR, 169 "Tx: cannot allocate new_skb\n"); 170 kfree_skb(skb); 171 priv->stats.tx_dropped++; 172 return; 173 } 174 175 kfree_skb(skb); 176 skb = new_skb; 177 mwifiex_dbg(priv->adapter, INFO, 178 "info: new skb headroom %d\n", 179 skb_headroom(skb)); 180 } 181 182 tx_info = MWIFIEX_SKB_TXCB(skb); 183 memset(tx_info, 0, sizeof(*tx_info)); 184 tx_info->bss_num = priv->bss_num; 185 tx_info->bss_type = priv->bss_type; 186 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; 187 188 src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source); 189 if (src_node) { 190 src_node->stats.last_rx = jiffies; 191 src_node->stats.rx_bytes += skb->len; 192 src_node->stats.rx_packets++; 193 src_node->stats.last_tx_rate = uap_rx_pd->rx_rate; 194 src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info; 195 } 196 197 if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) { 198 /* Update bridge packet statistics as the 199 * packet is not going to kernel/upper layer. 200 */ 201 priv->stats.rx_bytes += skb->len; 202 priv->stats.rx_packets++; 203 204 /* Sending bridge packet to TX queue, so save the packet 205 * length in TXCB to update statistics in TX complete. 206 */ 207 tx_info->pkt_len = skb->len; 208 } 209 210 __net_timestamp(skb); 211 212 index = mwifiex_1d_to_wmm_queue[skb->priority]; 213 atomic_inc(&priv->wmm_tx_pending[index]); 214 mwifiex_wmm_add_buf_txqueue(priv, skb); 215 atomic_inc(&adapter->tx_pending); 216 atomic_inc(&adapter->pending_bridged_pkts); 217 218 mwifiex_queue_main_work(priv->adapter); 219 220 return; 221 } 222 223 /* 224 * This function contains logic for AP packet forwarding. 225 * 226 * If a packet is multicast/broadcast, it is sent to kernel/upper layer 227 * as well as queued back to AP TX queue so that it can be sent to other 228 * associated stations. 229 * If a packet is unicast and RA is present in associated station list, 230 * it is again requeued into AP TX queue. 231 * If a packet is unicast and RA is not in associated station list, 232 * packet is forwarded to kernel to handle routing logic. 233 */ 234 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv, 235 struct sk_buff *skb) 236 { 237 struct mwifiex_adapter *adapter = priv->adapter; 238 struct uap_rxpd *uap_rx_pd; 239 struct rx_packet_hdr *rx_pkt_hdr; 240 u8 ra[ETH_ALEN]; 241 struct sk_buff *skb_uap; 242 243 uap_rx_pd = (struct uap_rxpd *)(skb->data); 244 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 245 246 /* don't do packet forwarding in disconnected state */ 247 if (!priv->media_connected) { 248 mwifiex_dbg(adapter, ERROR, 249 "drop packet in disconnected state.\n"); 250 dev_kfree_skb_any(skb); 251 return 0; 252 } 253 254 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN); 255 256 if (is_multicast_ether_addr(ra)) { 257 skb_uap = skb_copy(skb, GFP_ATOMIC); 258 mwifiex_uap_queue_bridged_pkt(priv, skb_uap); 259 } else { 260 if (mwifiex_get_sta_entry(priv, ra)) { 261 /* Requeue Intra-BSS packet */ 262 mwifiex_uap_queue_bridged_pkt(priv, skb); 263 return 0; 264 } 265 } 266 267 /* Forward unicat/Inter-BSS packets to kernel. */ 268 return mwifiex_process_rx_packet(priv, skb); 269 } 270 271 int mwifiex_uap_recv_packet(struct mwifiex_private *priv, 272 struct sk_buff *skb) 273 { 274 struct mwifiex_adapter *adapter = priv->adapter; 275 struct mwifiex_sta_node *src_node; 276 struct ethhdr *p_ethhdr; 277 struct sk_buff *skb_uap; 278 struct mwifiex_txinfo *tx_info; 279 280 if (!skb) 281 return -1; 282 283 p_ethhdr = (void *)skb->data; 284 src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source); 285 if (src_node) { 286 src_node->stats.last_rx = jiffies; 287 src_node->stats.rx_bytes += skb->len; 288 src_node->stats.rx_packets++; 289 } 290 291 if (is_multicast_ether_addr(p_ethhdr->h_dest) || 292 mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) { 293 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) 294 skb_uap = 295 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); 296 else 297 skb_uap = skb_copy(skb, GFP_ATOMIC); 298 299 if (likely(skb_uap)) { 300 tx_info = MWIFIEX_SKB_TXCB(skb_uap); 301 memset(tx_info, 0, sizeof(*tx_info)); 302 tx_info->bss_num = priv->bss_num; 303 tx_info->bss_type = priv->bss_type; 304 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; 305 __net_timestamp(skb_uap); 306 mwifiex_wmm_add_buf_txqueue(priv, skb_uap); 307 atomic_inc(&adapter->tx_pending); 308 atomic_inc(&adapter->pending_bridged_pkts); 309 if ((atomic_read(&adapter->pending_bridged_pkts) >= 310 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { 311 mwifiex_dbg(adapter, ERROR, 312 "Tx: Bridge packet limit reached. Drop packet!\n"); 313 mwifiex_uap_cleanup_tx_queues(priv); 314 } 315 316 } else { 317 mwifiex_dbg(adapter, ERROR, "failed to allocate skb_uap"); 318 } 319 320 mwifiex_queue_main_work(adapter); 321 /* Don't forward Intra-BSS unicast packet to upper layer*/ 322 if (mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) 323 return 0; 324 } 325 326 skb->dev = priv->netdev; 327 skb->protocol = eth_type_trans(skb, priv->netdev); 328 skb->ip_summed = CHECKSUM_NONE; 329 330 /* This is required only in case of 11n and USB/PCIE as we alloc 331 * a buffer of 4K only if its 11N (to be able to receive 4K 332 * AMSDU packets). In case of SD we allocate buffers based 333 * on the size of packet and hence this is not needed. 334 * 335 * Modifying the truesize here as our allocation for each 336 * skb is 4K but we only receive 2K packets and this cause 337 * the kernel to start dropping packets in case where 338 * application has allocated buffer based on 2K size i.e. 339 * if there a 64K packet received (in IP fragments and 340 * application allocates 64K to receive this packet but 341 * this packet would almost double up because we allocate 342 * each 1.5K fragment in 4K and pass it up. As soon as the 343 * 64K limit hits kernel will start to drop rest of the 344 * fragments. Currently we fail the Filesndl-ht.scr script 345 * for UDP, hence this fix 346 */ 347 if ((adapter->iface_type == MWIFIEX_USB || 348 adapter->iface_type == MWIFIEX_PCIE) && 349 skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE) 350 skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE); 351 352 /* Forward multicast/broadcast packet to upper layer*/ 353 netif_rx_any_context(skb); 354 return 0; 355 } 356 357 /* 358 * This function processes the packet received on AP interface. 359 * 360 * The function looks into the RxPD and performs sanity tests on the 361 * received buffer to ensure its a valid packet before processing it 362 * further. If the packet is determined to be aggregated, it is 363 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic. 364 * 365 * The completion callback is called after processing is complete. 366 */ 367 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv, 368 struct sk_buff *skb) 369 { 370 struct mwifiex_adapter *adapter = priv->adapter; 371 int ret; 372 struct uap_rxpd *uap_rx_pd; 373 struct rx_packet_hdr *rx_pkt_hdr; 374 u16 rx_pkt_type; 375 u8 ta[ETH_ALEN], pkt_type; 376 struct mwifiex_sta_node *node; 377 378 uap_rx_pd = (struct uap_rxpd *)(skb->data); 379 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type); 380 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 381 382 ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source); 383 384 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) + 385 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) { 386 mwifiex_dbg(adapter, ERROR, 387 "wrong rx packet: len=%d, offset=%d, length=%d\n", 388 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset), 389 le16_to_cpu(uap_rx_pd->rx_pkt_length)); 390 priv->stats.rx_dropped++; 391 392 node = mwifiex_get_sta_entry(priv, ta); 393 if (node) 394 node->stats.tx_failed++; 395 396 dev_kfree_skb_any(skb); 397 return 0; 398 } 399 400 if (rx_pkt_type == PKT_TYPE_MGMT) { 401 ret = mwifiex_process_mgmt_packet(priv, skb); 402 if (ret) 403 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed"); 404 dev_kfree_skb_any(skb); 405 return ret; 406 } 407 408 409 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) { 410 spin_lock_bh(&priv->sta_list_spinlock); 411 node = mwifiex_get_sta_entry(priv, ta); 412 if (node) 413 node->rx_seq[uap_rx_pd->priority] = 414 le16_to_cpu(uap_rx_pd->seq_num); 415 spin_unlock_bh(&priv->sta_list_spinlock); 416 } 417 418 if (!priv->ap_11n_enabled || 419 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) && 420 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) { 421 ret = mwifiex_handle_uap_rx_forward(priv, skb); 422 return ret; 423 } 424 425 /* Reorder and send to kernel */ 426 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type); 427 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num), 428 uap_rx_pd->priority, ta, pkt_type, 429 skb); 430 431 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 432 dev_kfree_skb_any(skb); 433 434 if (ret) 435 priv->stats.rx_dropped++; 436 437 return ret; 438 } 439 440 /* 441 * This function fills the TxPD for AP tx packets. 442 * 443 * The Tx buffer received by this function should already have the 444 * header space allocated for TxPD. 445 * 446 * This function inserts the TxPD in between interface header and actual 447 * data and adjusts the buffer pointers accordingly. 448 * 449 * The following TxPD fields are set by this function, as required - 450 * - BSS number 451 * - Tx packet length and offset 452 * - Priority 453 * - Packet delay 454 * - Priority specific Tx control 455 * - Flags 456 */ 457 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv, 458 struct sk_buff *skb) 459 { 460 struct mwifiex_adapter *adapter = priv->adapter; 461 struct uap_txpd *txpd; 462 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); 463 int pad; 464 u16 pkt_type, pkt_offset; 465 int hroom = adapter->intf_hdr_len; 466 467 if (!skb->len) { 468 mwifiex_dbg(adapter, ERROR, 469 "Tx: bad packet length: %d\n", skb->len); 470 tx_info->status_code = -1; 471 return skb->data; 472 } 473 474 BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN); 475 476 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0; 477 478 pad = ((uintptr_t)skb->data - (sizeof(*txpd) + hroom)) & 479 (MWIFIEX_DMA_ALIGN_SZ - 1); 480 481 skb_push(skb, sizeof(*txpd) + pad); 482 483 txpd = (struct uap_txpd *)skb->data; 484 memset(txpd, 0, sizeof(*txpd)); 485 txpd->bss_num = priv->bss_num; 486 txpd->bss_type = priv->bss_type; 487 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) + 488 pad))); 489 txpd->priority = (u8)skb->priority; 490 491 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 492 493 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS || 494 tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) { 495 txpd->tx_token_id = tx_info->ack_frame_id; 496 txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS; 497 } 498 499 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) 500 /* 501 * Set the priority specific tx_control field, setting of 0 will 502 * cause the default value to be used later in this function. 503 */ 504 txpd->tx_control = 505 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]); 506 507 /* Offset of actual data */ 508 pkt_offset = sizeof(*txpd) + pad; 509 if (pkt_type == PKT_TYPE_MGMT) { 510 /* Set the packet type and add header for management frame */ 511 txpd->tx_pkt_type = cpu_to_le16(pkt_type); 512 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE; 513 } 514 515 txpd->tx_pkt_offset = cpu_to_le16(pkt_offset); 516 517 /* make space for adapter->intf_hdr_len */ 518 skb_push(skb, hroom); 519 520 if (!txpd->tx_control) 521 /* TxCtrl set by user or default */ 522 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 523 524 return skb->data; 525 } 526