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 = 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 skb_put_data(skb_aggr, 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); 104 105 skb_push(skb, sizeof(*local_tx_pd)); 106 107 local_tx_pd = (struct txpd *) skb->data; 108 memset(local_tx_pd, 0, sizeof(struct txpd)); 109 110 /* Original priority has been overwritten */ 111 local_tx_pd->priority = (u8) skb->priority; 112 local_tx_pd->pkt_delay_2ms = 113 mwifiex_wmm_compute_drv_pkt_delay(priv, skb); 114 local_tx_pd->bss_num = priv->bss_num; 115 local_tx_pd->bss_type = priv->bss_type; 116 /* Always zero as the data is followed by struct txpd */ 117 local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd)); 118 local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU); 119 local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len - 120 sizeof(*local_tx_pd)); 121 122 if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT) 123 local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET; 124 125 if (local_tx_pd->tx_control == 0) 126 /* TxCtrl set by user or default */ 127 local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl); 128 129 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && 130 priv->adapter->pps_uapsd_mode) { 131 if (true == mwifiex_check_last_packet_indication(priv)) { 132 priv->adapter->tx_lock_flag = true; 133 local_tx_pd->flags = 134 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET; 135 } 136 } 137 } 138 139 /* 140 * Create aggregated packet. 141 * 142 * This function creates an aggregated MSDU packet, by combining buffers 143 * from the RA list. Each individual buffer is encapsulated as an AMSDU 144 * subframe and all such subframes are concatenated together to form the 145 * AMSDU packet. 146 * 147 * A TxPD is also added to the front of the resultant AMSDU packets for 148 * transmission. The resultant packets format is - 149 * 150 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+ 151 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame| 152 * | | 1 | 2 | .. | n | 153 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+ 154 */ 155 int 156 mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv, 157 struct mwifiex_ra_list_tbl *pra_list, 158 int ptrindex) 159 __releases(&priv->wmm.ra_list_spinlock) 160 { 161 struct mwifiex_adapter *adapter = priv->adapter; 162 struct sk_buff *skb_aggr, *skb_src; 163 struct mwifiex_txinfo *tx_info_aggr, *tx_info_src; 164 int pad = 0, aggr_num = 0, ret; 165 struct mwifiex_tx_param tx_param; 166 struct txpd *ptx_pd = NULL; 167 int headroom = adapter->intf_hdr_len; 168 169 skb_src = skb_peek(&pra_list->skb_head); 170 if (!skb_src) { 171 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 172 return 0; 173 } 174 175 tx_info_src = MWIFIEX_SKB_TXCB(skb_src); 176 skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size, 177 GFP_ATOMIC); 178 if (!skb_aggr) { 179 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 180 return -1; 181 } 182 183 /* skb_aggr->data already 64 byte align, just reserve bus interface 184 * header and txpd. 185 */ 186 skb_reserve(skb_aggr, headroom + sizeof(struct txpd)); 187 tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr); 188 189 memset(tx_info_aggr, 0, sizeof(*tx_info_aggr)); 190 tx_info_aggr->bss_type = tx_info_src->bss_type; 191 tx_info_aggr->bss_num = tx_info_src->bss_num; 192 193 if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT) 194 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT; 195 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT; 196 skb_aggr->priority = skb_src->priority; 197 skb_aggr->tstamp = skb_src->tstamp; 198 199 do { 200 /* Check if AMSDU can accommodate this MSDU */ 201 if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) > 202 adapter->tx_buf_size) 203 break; 204 205 skb_src = skb_dequeue(&pra_list->skb_head); 206 pra_list->total_pkt_count--; 207 atomic_dec(&priv->wmm.tx_pkts_queued); 208 aggr_num++; 209 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 210 mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad); 211 212 mwifiex_write_data_complete(adapter, skb_src, 0, 0); 213 214 spin_lock_bh(&priv->wmm.ra_list_spinlock); 215 216 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { 217 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 218 return -1; 219 } 220 221 if (skb_tailroom(skb_aggr) < pad) { 222 pad = 0; 223 break; 224 } 225 skb_put(skb_aggr, pad); 226 227 skb_src = skb_peek(&pra_list->skb_head); 228 229 } while (skb_src); 230 231 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 232 233 /* Last AMSDU packet does not need padding */ 234 skb_trim(skb_aggr, skb_aggr->len - pad); 235 236 /* Form AMSDU */ 237 mwifiex_11n_form_amsdu_txpd(priv, skb_aggr); 238 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) 239 ptx_pd = (struct txpd *)skb_aggr->data; 240 241 skb_push(skb_aggr, headroom); 242 tx_info_aggr->aggr_num = aggr_num * 2; 243 if (adapter->data_sent || adapter->tx_lock_flag) { 244 atomic_add(aggr_num * 2, &adapter->tx_queued); 245 skb_queue_tail(&adapter->tx_data_q, skb_aggr); 246 return 0; 247 } 248 249 if (skb_src) 250 tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd); 251 else 252 tx_param.next_pkt_len = 0; 253 254 if (adapter->iface_type == MWIFIEX_USB) { 255 ret = adapter->if_ops.host_to_card(adapter, priv->usb_port, 256 skb_aggr, &tx_param); 257 } else { 258 259 ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA, 260 skb_aggr, &tx_param); 261 } 262 switch (ret) { 263 case -EBUSY: 264 spin_lock_bh(&priv->wmm.ra_list_spinlock); 265 if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) { 266 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 267 mwifiex_write_data_complete(adapter, skb_aggr, 1, -1); 268 return -1; 269 } 270 if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA && 271 adapter->pps_uapsd_mode && adapter->tx_lock_flag) { 272 priv->adapter->tx_lock_flag = false; 273 if (ptx_pd) 274 ptx_pd->flags = 0; 275 } 276 277 skb_queue_tail(&pra_list->skb_head, skb_aggr); 278 279 pra_list->total_pkt_count++; 280 281 atomic_inc(&priv->wmm.tx_pkts_queued); 282 283 tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT; 284 spin_unlock_bh(&priv->wmm.ra_list_spinlock); 285 mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n"); 286 break; 287 case -1: 288 mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n", 289 __func__, ret); 290 adapter->dbg.num_tx_host_to_card_failure++; 291 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret); 292 return 0; 293 case -EINPROGRESS: 294 break; 295 case 0: 296 mwifiex_write_data_complete(adapter, skb_aggr, 1, ret); 297 break; 298 default: 299 break; 300 } 301 if (ret != -EBUSY) { 302 mwifiex_rotate_priolists(priv, pra_list, ptrindex); 303 } 304 305 return 0; 306 } 307