/*
* 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 = NULL;
skb_put(skb_aggr, sizeof(*tx_header));
tx_header = (struct tx_packet_hdr *) skb_aggr->data;
/* 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 = *(u16 *) ((u8 *)skb_src->data + dt_offset);
dt_offset += sizeof(u16);
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 */
skb_put(skb_aggr, skb_src->len);
memcpy(skb_aggr->data + sizeof(*tx_header), skb_src->data,
skb_src->len);
*pad = (((skb_src->len + LLC_SNAP_LEN) & 3)) ? (4 - (((skb_src->len +
LLC_SNAP_LEN)) & 3)) : 0;
skb_put(skb_aggr, *pad);
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;
}
}
}
/*
* Counts the number of subframes in an aggregate packet.
*
* This function parses an aggregate packet buffer, looking for
* subframes and counting the number of such subframe found. The
* function automatically skips the DA/SA fields at the beginning
* of each subframe and padding at the end.
*/
static int
mwifiex_11n_get_num_aggr_pkts(u8 *data, int total_pkt_len)
{
int pkt_count = 0, pkt_len, pad;
while (total_pkt_len > 0) {
/* Length will be in network format, change it to host */
pkt_len = ntohs((*(__be16 *)(data + 2 * ETH_ALEN)));
pad = (((pkt_len + sizeof(struct ethhdr)) & 3)) ?
(4 - ((pkt_len + sizeof(struct ethhdr)) & 3)) : 0;
data += pkt_len + pad + sizeof(struct ethhdr);
total_pkt_len -= pkt_len + pad + sizeof(struct ethhdr);
++pkt_count;
}
return pkt_count;
}
/*
* De-aggregate received packets.
*
* This function parses the received aggregate buffer, extracts each subframe,
* strips off the SNAP header from them and sends the data portion for further
* processing.
*
* Each subframe body is copied onto a separate buffer, which are freed by
* upper layer after processing. The function also performs sanity tests on
* the received buffer.
*/
int mwifiex_11n_deaggregate_pkt(struct mwifiex_private *priv,
struct sk_buff *skb)
{
u16 pkt_len;
int total_pkt_len;
u8 *data;
int pad;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct rxpd *local_rx_pd = (struct rxpd *) skb->data;
struct sk_buff *skb_daggr;
struct mwifiex_rxinfo *rx_info_daggr = NULL;
int ret = -1;
struct rx_packet_hdr *rx_pkt_hdr;
struct mwifiex_adapter *adapter = priv->adapter;
u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
data = (u8 *) (local_rx_pd + local_rx_pd->rx_pkt_offset);
total_pkt_len = local_rx_pd->rx_pkt_length;
/* Sanity test */
if (total_pkt_len > MWIFIEX_RX_DATA_BUF_SIZE) {
dev_err(adapter->dev, "total pkt len greater than buffer"
" size %d\n", total_pkt_len);
return -1;
}
rx_info->use_count = mwifiex_11n_get_num_aggr_pkts(data, total_pkt_len);
while (total_pkt_len > 0) {
rx_pkt_hdr = (struct rx_packet_hdr *) data;
/* Length will be in network format, change it to host */
pkt_len = ntohs((*(__be16 *) (data + 2 * ETH_ALEN)));
if (pkt_len > total_pkt_len) {
dev_err(adapter->dev, "pkt_len %d > total_pkt_len %d\n",
total_pkt_len, pkt_len);
break;
}
pad = (((pkt_len + sizeof(struct ethhdr)) & 3)) ?
(4 - ((pkt_len + sizeof(struct ethhdr)) & 3)) : 0;
total_pkt_len -= pkt_len + pad + sizeof(struct ethhdr);
if (memcmp(&rx_pkt_hdr->rfc1042_hdr,
rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
memmove(data + LLC_SNAP_LEN, data, 2 * ETH_ALEN);
data += LLC_SNAP_LEN;
pkt_len += sizeof(struct ethhdr) - LLC_SNAP_LEN;
} else {
*(u16 *) (data + 2 * ETH_ALEN) = (u16) 0;
pkt_len += sizeof(struct ethhdr);
}
skb_daggr = dev_alloc_skb(pkt_len);
if (!skb_daggr) {
dev_err(adapter->dev, "%s: failed to alloc skb_daggr\n",
__func__);
return -1;
}
rx_info_daggr = MWIFIEX_SKB_RXCB(skb_daggr);
rx_info_daggr->bss_index = rx_info->bss_index;
skb_daggr->tstamp = skb->tstamp;
rx_info_daggr->parent = skb;
skb_daggr->priority = skb->priority;
skb_put(skb_daggr, pkt_len);
memcpy(skb_daggr->data, data, pkt_len);
ret = mwifiex_recv_packet(adapter, skb_daggr);
switch (ret) {
case -EINPROGRESS:
break;
case -1:
dev_err(adapter->dev, "deaggr: host_to_card failed\n");
case 0:
mwifiex_recv_packet_complete(adapter, skb_daggr, ret);
break;
default:
break;
}
data += pkt_len + pad;
}
return ret;
}
/*
* 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 headroom,
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;
int ret = 0;
struct mwifiex_tx_param tx_param;
struct txpd *ptx_pd = NULL;
if (skb_queue_empty(&pra_list->skb_head)) {
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
return 0;
}
skb_src = skb_peek(&pra_list->skb_head);
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_index = tx_info_src->bss_index;
skb_aggr->priority = skb_src->priority;
while (skb_src && ((skb_headroom(skb_aggr) + skb_src->len
+ LLC_SNAP_LEN)
<= adapter->tx_buf_size)) {
if (!skb_queue_empty(&pra_list->skb_head))
skb_src = skb_dequeue(&pra_list->skb_head);
else
skb_src = NULL;
pra_list->total_pkts_size -= skb_src->len;
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);
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_queue_empty(&pra_list->skb_head))
skb_src = skb_peek(&pra_list->skb_head);
else
skb_src = NULL;
}
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);
tx_param.next_pkt_len = ((pra_list->total_pkts_size) ?
(((pra_list->total_pkts_size) >
adapter->tx_buf_size) ? adapter->
tx_buf_size : pra_list->total_pkts_size +
LLC_SNAP_LEN + sizeof(struct txpd)) : 0);
ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
skb_aggr->data,
skb_aggr->len, &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);
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;
ptx_pd->flags = 0;
}
skb_queue_tail(&pra_list->skb_head, skb_aggr);
pra_list->total_pkts_size += skb_aggr->len;
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:
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, ret);
return 0;
case -EINPROGRESS:
adapter->data_sent = false;
break;
case 0:
mwifiex_write_data_complete(adapter, skb_aggr, ret);
break;
default:
break;
}
if (ret != -EBUSY) {
spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
if (mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
priv->wmm.packets_out[ptrindex]++;
priv->wmm.tid_tbl_ptr[ptrindex].ra_list_curr = pra_list;
}
/* Now bss_prio_cur pointer points to next node */
adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
list_first_entry(
&adapter->bss_prio_tbl[priv->bss_priority]
.bss_prio_cur->list,
struct mwifiex_bss_prio_node, list);
spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
ra_list_flags);
}
return 0;
}
