1/* 2 * Marvell Wireless LAN device driver: AP TX and RX data handling 3 * 4 * Copyright (C) 2012-2014, Marvell International Ltd. 5 * 6 * This software file (the "File") is distributed by Marvell International 7 * Ltd. 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 */ 32static bool 33mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv, 34 struct list_head *ra_list_head) 35{ 36 struct mwifiex_ra_list_tbl *ra_list; 37 struct sk_buff *skb, *tmp; 38 bool pkt_deleted = false; 39 struct mwifiex_txinfo *tx_info; 40 struct mwifiex_adapter *adapter = priv->adapter; 41 42 list_for_each_entry(ra_list, ra_list_head, list) { 43 if (skb_queue_empty(&ra_list->skb_head)) 44 continue; 45 46 skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) { 47 tx_info = MWIFIEX_SKB_TXCB(skb); 48 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) { 49 __skb_unlink(skb, &ra_list->skb_head); 50 mwifiex_write_data_complete(adapter, skb, 0, 51 -1); 52 atomic_dec(&priv->wmm.tx_pkts_queued); 53 pkt_deleted = true; 54 } 55 if ((atomic_read(&adapter->pending_bridged_pkts) <= 56 MWIFIEX_BRIDGED_PKTS_THR_LOW)) 57 break; 58 } 59 } 60 61 return pkt_deleted; 62} 63 64/* This function deletes packets from particular RA List. RA list index 65 * from which packets are deleted is preserved so that packets from next RA 66 * list are deleted upon subsequent call thus maintaining fairness. 67 */ 68static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv) 69{ 70 unsigned long flags; 71 struct list_head *ra_list; 72 int i; 73 74 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags); 75 76 for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) { 77 if (priv->del_list_idx == MAX_NUM_TID) 78 priv->del_list_idx = 0; 79 ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list; 80 if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list)) { 81 priv->del_list_idx++; 82 break; 83 } 84 } 85 86 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags); 87} 88 89 90static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv, 91 struct sk_buff *skb) 92{ 93 struct mwifiex_adapter *adapter = priv->adapter; 94 struct uap_rxpd *uap_rx_pd; 95 struct rx_packet_hdr *rx_pkt_hdr; 96 struct sk_buff *new_skb; 97 struct mwifiex_txinfo *tx_info; 98 int hdr_chop; 99 struct ethhdr *p_ethhdr; 100 101 uap_rx_pd = (struct uap_rxpd *)(skb->data); 102 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 103 104 if ((atomic_read(&adapter->pending_bridged_pkts) >= 105 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) { 106 dev_err(priv->adapter->dev, 107 "Tx: Bridge packet limit reached. Drop packet!\n"); 108 kfree_skb(skb); 109 mwifiex_uap_cleanup_tx_queues(priv); 110 return; 111 } 112 113 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header, 114 sizeof(bridge_tunnel_header))) || 115 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header, 116 sizeof(rfc1042_header)) && 117 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP && 118 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) { 119 /* Replace the 803 header and rfc1042 header (llc/snap) with 120 * an Ethernet II header, keep the src/dst and snap_type 121 * (ethertype). 122 * 123 * The firmware only passes up SNAP frames converting all RX 124 * data from 802.11 to 802.2/LLC/SNAP frames. 125 * 126 * To create the Ethernet II, just move the src, dst address 127 * right before the snap_type. 128 */ 129 p_ethhdr = (struct ethhdr *) 130 ((u8 *)(&rx_pkt_hdr->eth803_hdr) 131 + sizeof(rx_pkt_hdr->eth803_hdr) 132 + sizeof(rx_pkt_hdr->rfc1042_hdr) 133 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest) 134 - sizeof(rx_pkt_hdr->eth803_hdr.h_source) 135 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type)); 136 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source, 137 sizeof(p_ethhdr->h_source)); 138 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest, 139 sizeof(p_ethhdr->h_dest)); 140 /* Chop off the rxpd + the excess memory from 141 * 802.2/llc/snap header that was removed. 142 */ 143 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd; 144 } else { 145 /* Chop off the rxpd */ 146 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd; 147 } 148 149 /* Chop off the leading header bytes so that it points 150 * to the start of either the reconstructed EthII frame 151 * or the 802.2/llc/snap frame. 152 */ 153 skb_pull(skb, hdr_chop); 154 155 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) { 156 dev_dbg(priv->adapter->dev, 157 "data: Tx: insufficient skb headroom %d\n", 158 skb_headroom(skb)); 159 /* Insufficient skb headroom - allocate a new skb */ 160 new_skb = 161 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN); 162 if (unlikely(!new_skb)) { 163 dev_err(priv->adapter->dev, 164 "Tx: cannot allocate new_skb\n"); 165 kfree_skb(skb); 166 priv->stats.tx_dropped++; 167 return; 168 } 169 170 kfree_skb(skb); 171 skb = new_skb; 172 dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n", 173 skb_headroom(skb)); 174 } 175 176 tx_info = MWIFIEX_SKB_TXCB(skb); 177 memset(tx_info, 0, sizeof(*tx_info)); 178 tx_info->bss_num = priv->bss_num; 179 tx_info->bss_type = priv->bss_type; 180 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT; 181 182 if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) { 183 /* Update bridge packet statistics as the 184 * packet is not going to kernel/upper layer. 185 */ 186 priv->stats.rx_bytes += skb->len; 187 priv->stats.rx_packets++; 188 189 /* Sending bridge packet to TX queue, so save the packet 190 * length in TXCB to update statistics in TX complete. 191 */ 192 tx_info->pkt_len = skb->len; 193 } 194 195 __net_timestamp(skb); 196 mwifiex_wmm_add_buf_txqueue(priv, skb); 197 atomic_inc(&adapter->tx_pending); 198 atomic_inc(&adapter->pending_bridged_pkts); 199 200 return; 201} 202 203/* 204 * This function contains logic for AP packet forwarding. 205 * 206 * If a packet is multicast/broadcast, it is sent to kernel/upper layer 207 * as well as queued back to AP TX queue so that it can be sent to other 208 * associated stations. 209 * If a packet is unicast and RA is present in associated station list, 210 * it is again requeued into AP TX queue. 211 * If a packet is unicast and RA is not in associated station list, 212 * packet is forwarded to kernel to handle routing logic. 213 */ 214int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv, 215 struct sk_buff *skb) 216{ 217 struct mwifiex_adapter *adapter = priv->adapter; 218 struct uap_rxpd *uap_rx_pd; 219 struct rx_packet_hdr *rx_pkt_hdr; 220 u8 ra[ETH_ALEN]; 221 struct sk_buff *skb_uap; 222 223 uap_rx_pd = (struct uap_rxpd *)(skb->data); 224 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 225 226 /* don't do packet forwarding in disconnected state */ 227 if (!priv->media_connected) { 228 dev_err(adapter->dev, "drop packet in disconnected state.\n"); 229 dev_kfree_skb_any(skb); 230 return 0; 231 } 232 233 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN); 234 235 if (is_multicast_ether_addr(ra)) { 236 skb_uap = skb_copy(skb, GFP_ATOMIC); 237 mwifiex_uap_queue_bridged_pkt(priv, skb_uap); 238 } else { 239 if (mwifiex_get_sta_entry(priv, ra)) { 240 /* Requeue Intra-BSS packet */ 241 mwifiex_uap_queue_bridged_pkt(priv, skb); 242 return 0; 243 } 244 } 245 246 /* Forward unicat/Inter-BSS packets to kernel. */ 247 return mwifiex_process_rx_packet(priv, skb); 248} 249 250/* 251 * This function processes the packet received on AP interface. 252 * 253 * The function looks into the RxPD and performs sanity tests on the 254 * received buffer to ensure its a valid packet before processing it 255 * further. If the packet is determined to be aggregated, it is 256 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic. 257 * 258 * The completion callback is called after processing is complete. 259 */ 260int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv, 261 struct sk_buff *skb) 262{ 263 struct mwifiex_adapter *adapter = priv->adapter; 264 int ret; 265 struct uap_rxpd *uap_rx_pd; 266 struct rx_packet_hdr *rx_pkt_hdr; 267 u16 rx_pkt_type; 268 u8 ta[ETH_ALEN], pkt_type; 269 struct mwifiex_sta_node *node; 270 271 uap_rx_pd = (struct uap_rxpd *)(skb->data); 272 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type); 273 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset); 274 275 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) + 276 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) { 277 dev_err(adapter->dev, 278 "wrong rx packet: len=%d, offset=%d, length=%d\n", 279 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset), 280 le16_to_cpu(uap_rx_pd->rx_pkt_length)); 281 priv->stats.rx_dropped++; 282 dev_kfree_skb_any(skb); 283 return 0; 284 } 285 286 if (rx_pkt_type == PKT_TYPE_MGMT) { 287 ret = mwifiex_process_mgmt_packet(priv, skb); 288 if (ret) 289 dev_err(adapter->dev, "Rx of mgmt packet failed"); 290 dev_kfree_skb_any(skb); 291 return ret; 292 } 293 294 memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN); 295 296 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) { 297 node = mwifiex_get_sta_entry(priv, ta); 298 if (node) 299 node->rx_seq[uap_rx_pd->priority] = 300 le16_to_cpu(uap_rx_pd->seq_num); 301 } 302 303 if (!priv->ap_11n_enabled || 304 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) && 305 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) { 306 ret = mwifiex_handle_uap_rx_forward(priv, skb); 307 return ret; 308 } 309 310 /* Reorder and send to kernel */ 311 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type); 312 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num), 313 uap_rx_pd->priority, ta, pkt_type, 314 skb); 315 316 if (ret || (rx_pkt_type == PKT_TYPE_BAR)) 317 dev_kfree_skb_any(skb); 318 319 if (ret) 320 priv->stats.rx_dropped++; 321 322 return ret; 323} 324 325/* 326 * This function fills the TxPD for AP tx packets. 327 * 328 * The Tx buffer received by this function should already have the 329 * header space allocated for TxPD. 330 * 331 * This function inserts the TxPD in between interface header and actual 332 * data and adjusts the buffer pointers accordingly. 333 * 334 * The following TxPD fields are set by this function, as required - 335 * - BSS number 336 * - Tx packet length and offset 337 * - Priority 338 * - Packet delay 339 * - Priority specific Tx control 340 * - Flags 341 */ 342void *mwifiex_process_uap_txpd(struct mwifiex_private *priv, 343 struct sk_buff *skb) 344{ 345 struct mwifiex_adapter *adapter = priv->adapter; 346 struct uap_txpd *txpd; 347 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); 348 int pad, len; 349 u16 pkt_type; 350 351 if (!skb->len) { 352 dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len); 353 tx_info->status_code = -1; 354 return skb->data; 355 } 356 357 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0; 358 359 /* If skb->data is not aligned, add padding */ 360 pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4; 361 362 len = sizeof(*txpd) + pad; 363 364 BUG_ON(skb_headroom(skb) < len + INTF_HEADER_LEN); 365 366 skb_push(skb, len); 367 368 txpd = (struct uap_txpd *)skb->data; 369 memset(txpd, 0, sizeof(*txpd)); 370 txpd->bss_num = priv->bss_num; 371 txpd->bss_type = priv->bss_type; 372 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - len)); 373 374 txpd->priority = (u8)skb->priority; 375 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 376 377 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl)) 378 /* 379 * Set the priority specific tx_control field, setting of 0 will 380 * cause the default value to be used later in this function. 381 */ 382 txpd->tx_control = 383 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]); 384 385 /* Offset of actual data */ 386 if (pkt_type == PKT_TYPE_MGMT) { 387 /* Set the packet type and add header for management frame */ 388 txpd->tx_pkt_type = cpu_to_le16(pkt_type); 389 len += MWIFIEX_MGMT_FRAME_HEADER_SIZE; 390 } 391 392 txpd->tx_pkt_offset = cpu_to_le16(len); 393 394 /* make space for INTF_HEADER_LEN */ 395 skb_push(skb, INTF_HEADER_LEN); 396 397 if (!txpd->tx_control) 398 /* TxCtrl set by user or default */ 399 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 400 401 return skb->data; 402} 403