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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * NXP Wireless LAN device driver: AP TX and RX data handling4 *5 * Copyright 2011-2020 NXP6 */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 bridge16 * packet threshold and then deletes packet from this RA list.17 * Function deletes packets from such RA list and returns true. If no such list18 * is found, false is returned.19 */20static bool21mwifiex_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 else44 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 index57 * from which packets are deleted is preserved so that packets from next RA58 * list are deleted upon subsequent call thus maintaining fairness.59 */60static 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 81static 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 (sizeof(*rx_pkt_hdr) +107 le16_to_cpu(uap_rx_pd->rx_pkt_offset) > skb->len) {108 mwifiex_dbg(adapter, ERROR,109 "wrong rx packet offset: len=%d,rx_pkt_offset=%d\n",110 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));111 priv->stats.rx_dropped++;112 dev_kfree_skb_any(skb);113 return;114 }115 116 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,117 sizeof(bridge_tunnel_header))) ||118 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,119 sizeof(rfc1042_header)) &&120 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&121 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {122 /* Replace the 803 header and rfc1042 header (llc/snap) with123 * an Ethernet II header, keep the src/dst and snap_type124 * (ethertype).125 *126 * The firmware only passes up SNAP frames converting all RX127 * data from 802.11 to 802.2/LLC/SNAP frames.128 *129 * To create the Ethernet II, just move the src, dst address130 * right before the snap_type.131 */132 p_ethhdr = (struct ethhdr *)133 ((u8 *)(&rx_pkt_hdr->eth803_hdr)134 + sizeof(rx_pkt_hdr->eth803_hdr)135 + sizeof(rx_pkt_hdr->rfc1042_hdr)136 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)137 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)138 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));139 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,140 sizeof(p_ethhdr->h_source));141 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,142 sizeof(p_ethhdr->h_dest));143 /* Chop off the rxpd + the excess memory from144 * 802.2/llc/snap header that was removed.145 */146 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd;147 } else {148 /* Chop off the rxpd */149 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;150 }151 152 /* Chop off the leading header bytes so that it points153 * to the start of either the reconstructed EthII frame154 * or the 802.2/llc/snap frame.155 */156 skb_pull(skb, hdr_chop);157 158 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {159 mwifiex_dbg(priv->adapter, ERROR,160 "data: Tx: insufficient skb headroom %d\n",161 skb_headroom(skb));162 /* Insufficient skb headroom - allocate a new skb */163 new_skb =164 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);165 if (unlikely(!new_skb)) {166 mwifiex_dbg(priv->adapter, ERROR,167 "Tx: cannot allocate new_skb\n");168 kfree_skb(skb);169 priv->stats.tx_dropped++;170 return;171 }172 173 kfree_skb(skb);174 skb = new_skb;175 mwifiex_dbg(priv->adapter, INFO,176 "info: new skb headroom %d\n",177 skb_headroom(skb));178 }179 180 tx_info = MWIFIEX_SKB_TXCB(skb);181 memset(tx_info, 0, sizeof(*tx_info));182 tx_info->bss_num = priv->bss_num;183 tx_info->bss_type = priv->bss_type;184 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;185 186 src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source);187 if (src_node) {188 src_node->stats.last_rx = jiffies;189 src_node->stats.rx_bytes += skb->len;190 src_node->stats.rx_packets++;191 src_node->stats.last_tx_rate = uap_rx_pd->rx_rate;192 src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info;193 }194 195 if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) {196 /* Update bridge packet statistics as the197 * packet is not going to kernel/upper layer.198 */199 priv->stats.rx_bytes += skb->len;200 priv->stats.rx_packets++;201 202 /* Sending bridge packet to TX queue, so save the packet203 * length in TXCB to update statistics in TX complete.204 */205 tx_info->pkt_len = skb->len;206 }207 208 __net_timestamp(skb);209 210 index = mwifiex_1d_to_wmm_queue[skb->priority];211 atomic_inc(&priv->wmm_tx_pending[index]);212 mwifiex_wmm_add_buf_txqueue(priv, skb);213 atomic_inc(&adapter->tx_pending);214 atomic_inc(&adapter->pending_bridged_pkts);215 216 mwifiex_queue_main_work(priv->adapter);217 218 return;219}220 221/*222 * This function contains logic for AP packet forwarding.223 *224 * If a packet is multicast/broadcast, it is sent to kernel/upper layer225 * as well as queued back to AP TX queue so that it can be sent to other226 * associated stations.227 * If a packet is unicast and RA is present in associated station list,228 * it is again requeued into AP TX queue.229 * If a packet is unicast and RA is not in associated station list,230 * packet is forwarded to kernel to handle routing logic.231 */232int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,233 struct sk_buff *skb)234{235 struct mwifiex_adapter *adapter = priv->adapter;236 struct uap_rxpd *uap_rx_pd;237 struct rx_packet_hdr *rx_pkt_hdr;238 u8 ra[ETH_ALEN];239 struct sk_buff *skb_uap;240 241 uap_rx_pd = (struct uap_rxpd *)(skb->data);242 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);243 244 /* don't do packet forwarding in disconnected state */245 if (!priv->media_connected) {246 mwifiex_dbg(adapter, ERROR,247 "drop packet in disconnected state.\n");248 dev_kfree_skb_any(skb);249 return 0;250 }251 252 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);253 254 if (is_multicast_ether_addr(ra)) {255 skb_uap = skb_copy(skb, GFP_ATOMIC);256 if (likely(skb_uap)) {257 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);258 } else {259 mwifiex_dbg(adapter, ERROR,260 "failed to copy skb for uAP\n");261 priv->stats.rx_dropped++;262 dev_kfree_skb_any(skb);263 return -1;264 }265 } else {266 if (mwifiex_get_sta_entry(priv, ra)) {267 /* Requeue Intra-BSS packet */268 mwifiex_uap_queue_bridged_pkt(priv, skb);269 return 0;270 }271 }272 273 /* Forward unicat/Inter-BSS packets to kernel. */274 return mwifiex_process_rx_packet(priv, skb);275}276 277int mwifiex_uap_recv_packet(struct mwifiex_private *priv,278 struct sk_buff *skb)279{280 struct mwifiex_adapter *adapter = priv->adapter;281 struct mwifiex_sta_node *src_node;282 struct ethhdr *p_ethhdr;283 struct sk_buff *skb_uap;284 struct mwifiex_txinfo *tx_info;285 286 if (!skb)287 return -1;288 289 p_ethhdr = (void *)skb->data;290 src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);291 if (src_node) {292 src_node->stats.last_rx = jiffies;293 src_node->stats.rx_bytes += skb->len;294 src_node->stats.rx_packets++;295 }296 297 if (is_multicast_ether_addr(p_ethhdr->h_dest) ||298 mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) {299 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN)300 skb_uap =301 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);302 else303 skb_uap = skb_copy(skb, GFP_ATOMIC);304 305 if (likely(skb_uap)) {306 tx_info = MWIFIEX_SKB_TXCB(skb_uap);307 memset(tx_info, 0, sizeof(*tx_info));308 tx_info->bss_num = priv->bss_num;309 tx_info->bss_type = priv->bss_type;310 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;311 __net_timestamp(skb_uap);312 mwifiex_wmm_add_buf_txqueue(priv, skb_uap);313 atomic_inc(&adapter->tx_pending);314 atomic_inc(&adapter->pending_bridged_pkts);315 if ((atomic_read(&adapter->pending_bridged_pkts) >=316 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {317 mwifiex_dbg(adapter, ERROR,318 "Tx: Bridge packet limit reached. Drop packet!\n");319 mwifiex_uap_cleanup_tx_queues(priv);320 }321 322 } else {323 mwifiex_dbg(adapter, ERROR, "failed to allocate skb_uap");324 }325 326 mwifiex_queue_main_work(adapter);327 /* Don't forward Intra-BSS unicast packet to upper layer*/328 if (mwifiex_get_sta_entry(priv, p_ethhdr->h_dest))329 return 0;330 }331 332 skb->dev = priv->netdev;333 skb->protocol = eth_type_trans(skb, priv->netdev);334 skb->ip_summed = CHECKSUM_NONE;335 336 /* This is required only in case of 11n and USB/PCIE as we alloc337 * a buffer of 4K only if its 11N (to be able to receive 4K338 * AMSDU packets). In case of SD we allocate buffers based339 * on the size of packet and hence this is not needed.340 *341 * Modifying the truesize here as our allocation for each342 * skb is 4K but we only receive 2K packets and this cause343 * the kernel to start dropping packets in case where344 * application has allocated buffer based on 2K size i.e.345 * if there a 64K packet received (in IP fragments and346 * application allocates 64K to receive this packet but347 * this packet would almost double up because we allocate348 * each 1.5K fragment in 4K and pass it up. As soon as the349 * 64K limit hits kernel will start to drop rest of the350 * fragments. Currently we fail the Filesndl-ht.scr script351 * for UDP, hence this fix352 */353 if ((adapter->iface_type == MWIFIEX_USB ||354 adapter->iface_type == MWIFIEX_PCIE) &&355 skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE)356 skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);357 358 /* Forward multicast/broadcast packet to upper layer*/359 netif_rx(skb);360 return 0;361}362 363/*364 * This function processes the packet received on AP interface.365 *366 * The function looks into the RxPD and performs sanity tests on the367 * received buffer to ensure its a valid packet before processing it368 * further. If the packet is determined to be aggregated, it is369 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.370 *371 * The completion callback is called after processing is complete.372 */373int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,374 struct sk_buff *skb)375{376 struct mwifiex_adapter *adapter = priv->adapter;377 int ret;378 struct uap_rxpd *uap_rx_pd;379 struct rx_packet_hdr *rx_pkt_hdr;380 u16 rx_pkt_type;381 u8 ta[ETH_ALEN], pkt_type;382 struct mwifiex_sta_node *node;383 384 uap_rx_pd = (struct uap_rxpd *)(skb->data);385 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);386 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);387 388 if (le16_to_cpu(uap_rx_pd->rx_pkt_offset) +389 sizeof(rx_pkt_hdr->eth803_hdr) > skb->len) {390 mwifiex_dbg(adapter, ERROR,391 "wrong rx packet for struct ethhdr: len=%d, offset=%d\n",392 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));393 priv->stats.rx_dropped++;394 dev_kfree_skb_any(skb);395 return 0;396 }397 398 ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);399 400 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +401 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {402 mwifiex_dbg(adapter, ERROR,403 "wrong rx packet: len=%d, offset=%d, length=%d\n",404 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),405 le16_to_cpu(uap_rx_pd->rx_pkt_length));406 priv->stats.rx_dropped++;407 408 node = mwifiex_get_sta_entry(priv, ta);409 if (node)410 node->stats.tx_failed++;411 412 dev_kfree_skb_any(skb);413 return 0;414 }415 416 if (rx_pkt_type == PKT_TYPE_MGMT) {417 ret = mwifiex_process_mgmt_packet(priv, skb);418 if (ret)419 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");420 dev_kfree_skb_any(skb);421 return ret;422 }423 424 425 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {426 spin_lock_bh(&priv->sta_list_spinlock);427 node = mwifiex_get_sta_entry(priv, ta);428 if (node)429 node->rx_seq[uap_rx_pd->priority] =430 le16_to_cpu(uap_rx_pd->seq_num);431 spin_unlock_bh(&priv->sta_list_spinlock);432 }433 434 if (!priv->ap_11n_enabled ||435 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&436 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {437 ret = mwifiex_handle_uap_rx_forward(priv, skb);438 return ret;439 }440 441 /* Reorder and send to kernel */442 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);443 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),444 uap_rx_pd->priority, ta, pkt_type,445 skb);446 447 if (ret || (rx_pkt_type == PKT_TYPE_BAR))448 dev_kfree_skb_any(skb);449 450 if (ret)451 priv->stats.rx_dropped++;452 453 return ret;454}455 456/*457 * This function fills the TxPD for AP tx packets.458 *459 * The Tx buffer received by this function should already have the460 * header space allocated for TxPD.461 *462 * This function inserts the TxPD in between interface header and actual463 * data and adjusts the buffer pointers accordingly.464 *465 * The following TxPD fields are set by this function, as required -466 * - BSS number467 * - Tx packet length and offset468 * - Priority469 * - Packet delay470 * - Priority specific Tx control471 * - Flags472 */473void mwifiex_process_uap_txpd(struct mwifiex_private *priv,474 struct sk_buff *skb)475{476 struct mwifiex_adapter *adapter = priv->adapter;477 struct uap_txpd *txpd;478 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);479 int pad;480 u16 pkt_type, pkt_offset;481 int hroom = adapter->intf_hdr_len;482 483 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;484 485 pad = ((uintptr_t)skb->data - (sizeof(*txpd) + hroom)) &486 (MWIFIEX_DMA_ALIGN_SZ - 1);487 488 skb_push(skb, sizeof(*txpd) + pad);489 490 txpd = (struct uap_txpd *)skb->data;491 memset(txpd, 0, sizeof(*txpd));492 txpd->bss_num = priv->bss_num;493 txpd->bss_type = priv->bss_type;494 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) +495 pad)));496 txpd->priority = (u8)skb->priority;497 498 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);499 500 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||501 tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {502 txpd->tx_token_id = tx_info->ack_frame_id;503 txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;504 }505 506 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))507 /*508 * Set the priority specific tx_control field, setting of 0 will509 * cause the default value to be used later in this function.510 */511 txpd->tx_control =512 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);513 514 /* Offset of actual data */515 pkt_offset = sizeof(*txpd) + pad;516 if (pkt_type == PKT_TYPE_MGMT) {517 /* Set the packet type and add header for management frame */518 txpd->tx_pkt_type = cpu_to_le16(pkt_type);519 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;520 }521 522 txpd->tx_pkt_offset = cpu_to_le16(pkt_offset);523 524 /* make space for adapter->intf_hdr_len */525 skb_push(skb, hroom);526 527 if (!txpd->tx_control)528 /* TxCtrl set by user or default */529 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);530}531