drivers/net/wireless/marvell/mwifiex/11n_aggr.c

   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 }