1 /* 2 * Marvell Wireless LAN device driver: 802.11n Aggregation 3 * 4 * Copyright (C) 2011-2014, 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 "util.h" 23 #include "fw.h" 24 #include "main.h" 25 #include "wmm.h" 26 #include "11n.h" 27 #include "11n_aggr.h" 28 29 /* 30 * Creates an AMSDU subframe for aggregation into one AMSDU packet. 31 * 32 * The resultant AMSDU subframe format is - 33 * 34 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+ 35 * | DA | SA | Length | SNAP header | MSDU | 36 * | data[0..5] | data[6..11] | | | data[14..] | 37 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+ 38 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes--> 39 * 40 * This function also computes the amount of padding required to make the 41 * buffer length multiple of 4 bytes. 42 * 43 * Data => |DA|SA|SNAP-TYPE|........ .| 44 * MSDU => |DA|SA|Length|SNAP|...... ..| 45 */ 46 static int 47 mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr, 48 struct sk_buff *skb_src, int *pad) 49 50 { 51 int dt_offset; 52 struct rfc_1042_hdr snap = { 53 0xaa, /* LLC DSAP */ 54 0xaa, /* LLC SSAP */ 55 0x03, /* LLC CTRL */ 56 {0x00, 0x00, 0x00}, /* SNAP OUI */ 57 0x0000 /* SNAP type */ 58 /* 59 * This field will be overwritten 60 * later with ethertype 61 */ 62 }; 63 struct tx_packet_hdr *tx_header; 64 65 tx_header = (void *)skb_put(skb_aggr, sizeof(*tx_header)); 66 67 /* Copy DA and SA */ 68 dt_offset = 2 * ETH_ALEN; 69 memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset); 70 71 /* Copy SNAP header */ 72 snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto; 73 74 dt_offset += sizeof(__be16); 75 76 memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr)); 77 78 skb_pull(skb_src, dt_offset); 79 80 /* Update Length field */ 81 tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN); 82 83 /* Add payload */ 84 memcpy(skb_put(skb_aggr, skb_src->len), skb_src->data, skb_src->len); 85 86 /* Add padding for new MSDU to start from 4 byte boundary */ 87 *pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4; 88 89 return skb_aggr->len + *pad; 90 } 91 92 /* 93 * Adds TxPD to AMSDU header. 94 * 95 * Each AMSDU packet will contain one TxPD at the beginning, 96 * followed by multiple AMSDU subframes. 97 */ 98 static void 99 mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv, 100 struct sk_buff *skb) 101 { 102 struct txpd *local_tx_pd; 103 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb); 104 unsigned int pad; 105 int headroom = (priv->adapter->iface_type == 106 MWIFIEX_USB) ? 0 : INTF_HEADER_LEN; 107 108 pad = ((void *)skb->data - sizeof(*local_tx_pd) - 109 headroom - NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1); 110 skb_push(skb, pad); 111 112 skb_push(skb, sizeof(*local_tx_pd)); 113 114 local_tx_pd = (struct txpd *) skb->data; 115 memset(local_tx_pd, 0, sizeof(struct txpd)); 116 117 /* Original priority has been overwritten */ 118 local_tx_pd->priority = (u8) skb->priority; 119 local_tx_pd->pkt_delay_2ms = 120 mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 121 local_tx_pd->bss_num = priv->bss_num; 122 local_tx_pd->bss_type = priv->bss_type; 123 /* Always zero as the data is followed by struct txpd */ 124 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) + 125 pad); 126 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU); 127 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len - 128 sizeof(*local_tx_pd) - 129 pad); 130 131 if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT) 132 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET; 133 134 if (local_tx_pd->tx_control == 0) 135 /* TxCtrl set by user or default */ 136 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 137 138 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && 139 priv->adapter->pps_uapsd_mode) { 140 if (true == mwifiex_check_last_packet_indication(priv)) { 141 priv->adapter->tx_lock_flag = true; 142 local_tx_pd->flags = 143 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET; 144 } 145 } 146 } 147 148 /* 149 * Create aggregated packet. 150 * 151 * This function creates an aggregated MSDU packet, by combining buffers 152 * from the RA list. Each individual buffer is encapsulated as an AMSDU 153 * subframe and all such subframes are concatenated together to form the 154 * AMSDU packet. 155 * 156 * A TxPD is also added to the front of the resultant AMSDU packets for 157 * transmission. The resultant packets format is - 158 * 159 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+ 160 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame| 161 * | | 1 | 2 | .. | n | 162 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+ 163 */ 164 int 165 mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv, 166 struct mwifiex_ra_list_tbl *pra_list, 167 int ptrindex, unsigned long ra_list_flags) 168 __releases(&priv->wmm.ra_list_spinlock) 169 { 170 struct mwifiex_adapter *adapter = priv->adapter; 171 struct sk_buff *skb_aggr, *skb_src; 172 struct mwifiex_txinfo *tx_info_aggr, *tx_info_src; 173 int pad = 0, aggr_num = 0, ret; 174 struct mwifiex_tx_param tx_param; 175 struct txpd *ptx_pd = NULL; 176 int headroom = adapter->iface_type == MWIFIEX_USB ? 0 : INTF_HEADER_LEN; 177 178 skb_src = skb_peek(&pra_list->skb_head); 179 if (!skb_src) { 180 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 181 ra_list_flags); 182 return 0; 183 } 184 185 tx_info_src = MWIFIEX_SKB_TXCB(skb_src); 186 skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size, 187 GFP_ATOMIC); 188 if (!skb_aggr) { 189 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 190 ra_list_flags); 191 return -1; 192 } 193 skb_reserve(skb_aggr, MWIFIEX_MIN_DATA_HEADER_LEN); 194 tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr); 195 196 memset(tx_info_aggr, 0, sizeof(*tx_info_aggr)); 197 tx_info_aggr->bss_type = tx_info_src->bss_type; 198 tx_info_aggr->bss_num = tx_info_src->bss_num; 199 200 if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT) 201 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT; 202 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT; 203 skb_aggr->priority = skb_src->priority; 204 skb_aggr->tstamp = skb_src->tstamp; 205 206 do { 207 /* Check if AMSDU can accommodate this MSDU */ 208 if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) > 209 adapter->tx_buf_size) 210 break; 211 212 skb_src = skb_dequeue(&pra_list->skb_head); 213 pra_list->total_pkt_count--; 214 atomic_dec(&priv->wmm.tx_pkts_queued); 215 aggr_num++; 216 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 217 ra_list_flags); 218 mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad); 219 220 mwifiex_write_data_complete(adapter, skb_src, 0, 0); 221 222 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); 223 224 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { 225 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 226 ra_list_flags); 227 return -1; 228 } 229 230 if (skb_tailroom(skb_aggr) < pad) { 231 pad = 0; 232 break; 233 } 234 skb_put(skb_aggr, pad); 235 236 skb_src = skb_peek(&pra_list->skb_head); 237 238 } while (skb_src); 239 240 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags); 241 242 /* Last AMSDU packet does not need padding */ 243 skb_trim(skb_aggr, skb_aggr->len - pad); 244 245 /* Form AMSDU */ 246 mwifiex_11n_form_amsdu_txpd(priv, skb_aggr); 247 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) 248 ptx_pd = (struct txpd *)skb_aggr->data; 249 250 skb_push(skb_aggr, headroom); 251 tx_info_aggr->aggr_num = aggr_num * 2; 252 if (adapter->data_sent || adapter->tx_lock_flag) { 253 atomic_add(aggr_num * 2, &adapter->tx_queued); 254 skb_queue_tail(&adapter->tx_data_q, skb_aggr); 255 return 0; 256 } 257 258 if (adapter->iface_type == MWIFIEX_USB) { 259 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port, 260 skb_aggr, NULL); 261 } else { 262 if (skb_src) 263 tx_param.next_pkt_len = 264 skb_src->len + sizeof(struct txpd); 265 else 266 tx_param.next_pkt_len = 0; 267 268 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, 269 skb_aggr, &tx_param); 270 } 271 switch (ret) { 272 case -EBUSY: 273 spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags); 274 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { 275 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 276 ra_list_flags); 277 mwifiex_write_data_complete(adapter, skb_aggr, 1, -1); 278 return -1; 279 } 280 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && 281 adapter->pps_uapsd_mode && adapter->tx_lock_flag) { 282 priv->adapter->tx_lock_flag = false; 283 if (ptx_pd) 284 ptx_pd->flags = 0; 285 } 286 287 skb_queue_tail(&pra_list->skb_head, skb_aggr); 288 289 pra_list->total_pkt_count++; 290 291 atomic_inc(&priv->wmm.tx_pkts_queued); 292 293 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT; 294 spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, 295 ra_list_flags); 296 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n"); 297 break; 298 case -1: 299 mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n", 300 __func__, ret); 301 adapter->dbg.num_tx_host_to_card_failure++; 302 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret); 303 return 0; 304 case -EINPROGRESS: 305 break; 306 case 0: 307 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret); 308 break; 309 default: 310 break; 311 } 312 if (ret != -EBUSY) { 313 mwifiex_rotate_priolists(priv, pra_list, ptrindex); 314 } 315 316 return 0; 317 } 318