/*
* Marvell Wireless LAN device driver: 802.11n Aggregation
*
* Copyright (C) 2011, Marvell International Ltd.
*
* This software file (the "File") is distributed by Marvell International
* Ltd. under the terms of the GNU General Public License Version 2, June 1991
* (the "License"). You may use, redistribute and/or modify this File in
* accordance with the terms and conditions of the License, a copy of which
* is available by writing to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
* this warranty disclaimer.
*/
#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"
#include "11n_aggr.h"
/*
* Creates an AMSDU subframe for aggregation into one AMSDU packet.
*
* The resultant AMSDU subframe format is -
*
* +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
* | DA | SA | Length | SNAP header | MSDU |
* | data[0..5] | data[6..11] | | | data[14..] |
* +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
* <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
*
* This function also computes the amount of padding required to make the
* buffer length multiple of 4 bytes.
*
* Data => |DA|SA|SNAP-TYPE|........ .|
* MSDU => |DA|SA|Length|SNAP|...... ..|
*/
static int
mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
struct sk_buff *skb_src, int *pad)
{
int dt_offset;
struct rfc_1042_hdr snap = {
0xaa, /* LLC DSAP */
0xaa, /* LLC SSAP */
0x03, /* LLC CTRL */
{0x00, 0x00, 0x00}, /* SNAP OUI */
0x0000 /* SNAP type */
/*
* This field will be overwritten
* later with ethertype
*/
};
struct tx_packet_hdr *tx_header;
tx_header = (void *)skb_put(skb_aggr, sizeof(*tx_header));
/* Copy DA and SA */
dt_offset = 2 * ETH_ALEN;
memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
/* Copy SNAP header */
snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
dt_offset += sizeof(__be16);
memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
skb_pull(skb_src, dt_offset);
/* Update Length field */
tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
/* Add payload */
memcpy(skb_put(skb_aggr, skb_src->len), skb_src->data, skb_src->len);
/* Add padding for new MSDU to start from 4 byte boundary */
*pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
return skb_aggr->len + *pad;
}
/*
* Adds TxPD to AMSDU header.
*
* Each AMSDU packet will contain one TxPD at the beginning,
* followed by multiple AMSDU subframes.
*/
static void
mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
struct sk_buff *skb)
{
struct txpd *local_tx_pd;
skb_push(skb, sizeof(*local_tx_pd));
local_tx_pd = (struct txpd *) skb->data;
memset(local_tx_pd, 0, sizeof(struct txpd));
/* Original priority has been overwritten */
local_tx_pd->priority = (u8) skb->priority;
local_tx_pd->pkt_delay_2ms =
mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
local_tx_pd->bss_num = priv->bss_num;
local_tx_pd->bss_type = priv->bss_type;
/* Always zero as the data is followed by struct txpd */
local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
sizeof(*local_tx_pd));
if (local_tx_pd->tx_control == 0)
/* TxCtrl set by user or default */
local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
priv->adapter->pps_uapsd_mode) {
if (true == mwifiex_check_last_packet_indication(priv)) {
priv->adapter->tx_lock_flag = true;
local_tx_pd->flags =
MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
}
}
}
/*
* Create aggregated packet.
*
* This function creates an aggregated MSDU packet, by combining buffers
* from the RA list. Each individual buffer is encapsulated as an AMSDU
* subframe and all such subframes are concatenated together to form the
* AMSDU packet.
*
* A TxPD is also added to the front of the resultant AMSDU packets for
* transmission. The resultant packets format is -
*
* +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
* | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
* | | 1 | 2 | .. | n |
* +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
*/
int
mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
struct mwifiex_ra_list_tbl *pra_list,
int ptrindex, unsigned long ra_list_flags)
__releases(&priv->wmm.ra_list_spinlock)
{
struct mwifiex_adapter *adapter = priv->adapter;
struct sk_buff *skb_aggr, *skb_src;
struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
int pad = 0, ret;
struct mwifiex_tx_param tx_param;
struct txpd *ptx_pd = NULL;
int headroom = adapter->iface_type == MWIFIEX_USB ? 0 : INTF_HEADER_LEN;
skb_src = skb_peek(&pra_list->skb_head);
if (!skb_src) {
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
return 0;
}
tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
skb_aggr = dev_alloc_skb(adapter->tx_buf_size);
if (!skb_aggr) {
dev_err(adapter->dev, "%s: alloc skb_aggr\n", __func__);
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
return -1;
}
skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
tx_info_aggr = MWIFIEX_SKB_TXCB(skb_aggr);
tx_info_aggr->bss_type = tx_info_src->bss_type;
tx_info_aggr->bss_num = tx_info_src->bss_num;
skb_aggr->priority = skb_src->priority;
do {
/* Check if AMSDU can accommodate this MSDU */
if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN))
break;
skb_src = skb_dequeue(&pra_list->skb_head);
pra_list->total_pkt_count--;
atomic_dec(&priv->wmm.tx_pkts_queued);
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
mwifiex_write_data_complete(adapter, skb_src, 0, 0);
spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
return -1;
}
if (skb_tailroom(skb_aggr) < pad) {
pad = 0;
break;
}
skb_put(skb_aggr, pad);
skb_src = skb_peek(&pra_list->skb_head);
} while (skb_src);
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
/* Last AMSDU packet does not need padding */
skb_trim(skb_aggr, skb_aggr->len - pad);
/* Form AMSDU */
mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
ptx_pd = (struct txpd *)skb_aggr->data;
skb_push(skb_aggr, headroom);
if (adapter->iface_type == MWIFIEX_USB) {
adapter->data_sent = true;
ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
skb_aggr, NULL);
} else {
/*
* Padding per MSDU will affect the length of next
* packet and hence the exact length of next packet
* is uncertain here.
*
* Also, aggregation of transmission buffer, while
* downloading the data to the card, wont gain much
* on the AMSDU packets as the AMSDU packets utilizes
* the transmission buffer space to the maximum
* (adapter->tx_buf_size).
*/
tx_param.next_pkt_len = 0;
ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
skb_aggr, &tx_param);
}
switch (ret) {
case -EBUSY:
spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);
return -1;
}
if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
priv->adapter->tx_lock_flag = false;
if (ptx_pd)
ptx_pd->flags = 0;
}
skb_queue_tail(&pra_list->skb_head, skb_aggr);
pra_list->total_pkt_count++;
atomic_inc(&priv->wmm.tx_pkts_queued);
tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
break;
case -1:
if (adapter->iface_type != MWIFIEX_PCIE)
adapter->data_sent = false;
dev_err(adapter->dev, "%s: host_to_card failed: %#x\n",
__func__, ret);
adapter->dbg.num_tx_host_to_card_failure++;
mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
return 0;
case -EINPROGRESS:
if (adapter->iface_type != MWIFIEX_PCIE)
adapter->data_sent = false;
break;
case 0:
mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
break;
default:
break;
}
if (ret != -EBUSY) {
mwifiex_rotate_priolists(priv, pra_list, ptrindex);
}
return 0;
}