318 lines
9.5 KiB
C
318 lines
9.5 KiB
C
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/*
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* Marvell Wireless LAN device driver: 802.11n Aggregation
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*
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* Copyright (C) 2011, Marvell International Ltd.
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*
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* This software file (the "File") is distributed by Marvell International
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* Ltd. under the terms of the GNU General Public License Version 2, June 1991
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* (the "License"). You may use, redistribute and/or modify this File in
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* accordance with the terms and conditions of the License, a copy of which
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* is available by writing to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
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* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
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*
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* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
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* this warranty disclaimer.
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*/
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#include "decl.h"
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#include "ioctl.h"
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#include "util.h"
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#include "fw.h"
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#include "main.h"
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#include "wmm.h"
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#include "11n.h"
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#include "11n_aggr.h"
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/*
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* Creates an AMSDU subframe for aggregation into one AMSDU packet.
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*
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* The resultant AMSDU subframe format is -
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*
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* +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
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* | DA | SA | Length | SNAP header | MSDU |
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* | data[0..5] | data[6..11] | | | data[14..] |
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* +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
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* <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
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*
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* This function also computes the amount of padding required to make the
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* buffer length multiple of 4 bytes.
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*
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* Data => |DA|SA|SNAP-TYPE|........ .|
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* MSDU => |DA|SA|Length|SNAP|...... ..|
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*/
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static int
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mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
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struct sk_buff *skb_src, int *pad)
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{
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int dt_offset;
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struct rfc_1042_hdr snap = {
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0xaa, /* LLC DSAP */
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0xaa, /* LLC SSAP */
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0x03, /* LLC CTRL */
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{0x00, 0x00, 0x00}, /* SNAP OUI */
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0x0000 /* SNAP type */
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/*
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* This field will be overwritten
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* later with ethertype
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*/
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};
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struct tx_packet_hdr *tx_header;
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skb_put(skb_aggr, sizeof(*tx_header));
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tx_header = (struct tx_packet_hdr *) skb_aggr->data;
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/* Copy DA and SA */
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dt_offset = 2 * ETH_ALEN;
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memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
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/* Copy SNAP header */
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snap.snap_type = *(u16 *) ((u8 *)skb_src->data + dt_offset);
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dt_offset += sizeof(u16);
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memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
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skb_pull(skb_src, dt_offset);
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/* Update Length field */
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tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
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/* Add payload */
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skb_put(skb_aggr, skb_src->len);
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memcpy(skb_aggr->data + sizeof(*tx_header), skb_src->data,
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skb_src->len);
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*pad = (((skb_src->len + LLC_SNAP_LEN) & 3)) ? (4 - (((skb_src->len +
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LLC_SNAP_LEN)) & 3)) : 0;
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skb_put(skb_aggr, *pad);
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return skb_aggr->len + *pad;
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}
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/*
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* Adds TxPD to AMSDU header.
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*
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* Each AMSDU packet will contain one TxPD at the beginning,
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* followed by multiple AMSDU subframes.
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*/
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static void
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mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
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struct sk_buff *skb)
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{
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struct txpd *local_tx_pd;
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skb_push(skb, sizeof(*local_tx_pd));
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local_tx_pd = (struct txpd *) skb->data;
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memset(local_tx_pd, 0, sizeof(struct txpd));
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/* Original priority has been overwritten */
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local_tx_pd->priority = (u8) skb->priority;
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local_tx_pd->pkt_delay_2ms =
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mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
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local_tx_pd->bss_num = priv->bss_num;
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local_tx_pd->bss_type = priv->bss_type;
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/* Always zero as the data is followed by struct txpd */
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local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
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local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
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local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
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sizeof(*local_tx_pd));
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if (local_tx_pd->tx_control == 0)
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/* TxCtrl set by user or default */
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local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
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if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
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priv->adapter->pps_uapsd_mode) {
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if (true == mwifiex_check_last_packet_indication(priv)) {
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priv->adapter->tx_lock_flag = true;
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local_tx_pd->flags =
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MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
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}
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}
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}
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/*
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* Create aggregated packet.
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*
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* This function creates an aggregated MSDU packet, by combining buffers
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* from the RA list. Each individual buffer is encapsulated as an AMSDU
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* subframe and all such subframes are concatenated together to form the
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* AMSDU packet.
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*
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* A TxPD is also added to the front of the resultant AMSDU packets for
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* transmission. The resultant packets format is -
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*
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* +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
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* | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
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* | | 1 | 2 | .. | n |
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* +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
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*/
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int
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mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
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struct mwifiex_ra_list_tbl *pra_list, int headroom,
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int ptrindex, unsigned long ra_list_flags)
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__releases(&priv->wmm.ra_list_spinlock)
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{
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struct mwifiex_adapter *adapter = priv->adapter;
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struct sk_buff *skb_aggr, *skb_src;
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struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
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int pad = 0, ret;
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struct mwifiex_tx_param tx_param;
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struct txpd *ptx_pd = NULL;
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skb_src = skb_peek(&pra_list->skb_head);
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if (!skb_src) {
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
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ra_list_flags);
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return 0;
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}
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tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
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skb_aggr = dev_alloc_skb(adapter->tx_buf_size);
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if (!skb_aggr) {
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dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__);
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
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ra_list_flags);
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return -1;
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}
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skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
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tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr);
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tx_info_aggr->bss_type = tx_info_src->bss_type;
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tx_info_aggr->bss_num = tx_info_src->bss_num;
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skb_aggr->priority = skb_src->priority;
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do {
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/* Check if AMSDU can accommodate this MSDU */
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if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN))
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break;
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skb_src = skb_dequeue(&pra_list->skb_head);
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pra_list->total_pkts_size -= skb_src->len;
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atomic_dec(&priv->wmm.tx_pkts_queued);
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
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ra_list_flags);
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mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
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mwifiex_write_data_complete(adapter, skb_src, 0);
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spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
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if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
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ra_list_flags);
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return -1;
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}
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if (skb_tailroom(skb_aggr) < pad) {
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pad = 0;
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break;
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}
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skb_put(skb_aggr, pad);
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skb_src = skb_peek(&pra_list->skb_head);
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} while (skb_src);
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
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/* Last AMSDU packet does not need padding */
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skb_trim(skb_aggr, skb_aggr->len - pad);
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/* Form AMSDU */
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mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
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if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
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ptx_pd = (struct txpd *)skb_aggr->data;
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skb_push(skb_aggr, headroom);
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if (adapter->iface_type == MWIFIEX_USB) {
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adapter->data_sent = true;
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ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
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skb_aggr, NULL);
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} else {
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/*
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* Padding per MSDU will affect the length of next
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* packet and hence the exact length of next packet
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* is uncertain here.
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*
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* Also, aggregation of transmission buffer, while
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* downloading the data to the card, wont gain much
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* on the AMSDU packets as the AMSDU packets utilizes
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* the transmission buffer space to the maximum
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* (adapter->tx_buf_size).
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*/
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tx_param.next_pkt_len = 0;
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ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
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skb_aggr, &tx_param);
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}
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switch (ret) {
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case -EBUSY:
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spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
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if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
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ra_list_flags);
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mwifiex_write_data_complete(adapter, skb_aggr, -1);
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return -1;
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}
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if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
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adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
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priv->adapter->tx_lock_flag = false;
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if (ptx_pd)
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ptx_pd->flags = 0;
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}
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skb_queue_tail(&pra_list->skb_head, skb_aggr);
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pra_list->total_pkts_size += skb_aggr->len;
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atomic_inc(&priv->wmm.tx_pkts_queued);
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tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
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ra_list_flags);
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dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
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break;
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case -1:
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adapter->data_sent = false;
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dev_err(adapter->dev, "%s: host_to_card failed: %#x\n",
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__func__, ret);
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adapter->dbg.num_tx_host_to_card_failure++;
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mwifiex_write_data_complete(adapter, skb_aggr, ret);
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return 0;
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case -EINPROGRESS:
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adapter->data_sent = false;
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break;
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case 0:
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mwifiex_write_data_complete(adapter, skb_aggr, ret);
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break;
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default:
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break;
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}
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if (ret != -EBUSY) {
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spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
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if (mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
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priv->wmm.packets_out[ptrindex]++;
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priv->wmm.tid_tbl_ptr[ptrindex].ra_list_curr = pra_list;
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}
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/* Now bss_prio_cur pointer points to next node */
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adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
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list_first_entry(
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&adapter->bss_prio_tbl[priv->bss_priority]
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.bss_prio_cur->list,
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struct mwifiex_bss_prio_node, list);
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spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
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ra_list_flags);
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}
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return 0;
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}
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