/*
* Packet send completion callback handler.
*
* It either frees the buffer directly or forwards it to another
* completion callback which checks conditions, updates statistics,
* wakes up stalled traffic queue if required, and then frees the buffer.
*/
int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
struct sk_buff *skb, int aggr, int status)
{
struct mwifiex_private *priv;
struct mwifiex_txinfo *tx_info;
struct netdev_queue *txq;
int index;
if (!skb)
return 0;
tx_info = MWIFIEX_SKB_TXCB(skb);
priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
tx_info->bss_type);
if (!priv)
goto done;
if (adapter->iface_type == MWIFIEX_USB)
adapter->data_sent = false;
mwifiex_set_trans_start(priv->netdev);
if (!status) {
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
if (priv->tx_timeout_cnt)
priv->tx_timeout_cnt = 0;
} else {
priv->stats.tx_errors++;
}
if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT)
atomic_dec_return(&adapter->pending_bridged_pkts);
if (aggr)
/* For skb_aggr, do not wake up tx queue */
goto done;
atomic_dec(&adapter->tx_pending);
index = mwifiex_1d_to_wmm_queue[skb->priority];
if (atomic_dec_return(&priv->wmm_tx_pending[index]) < LOW_TX_PENDING) {
txq = netdev_get_tx_queue(priv->netdev, index);
if (netif_tx_queue_stopped(txq)) {
netif_tx_wake_queue(txq);
dev_dbg(adapter->dev, "wake queue: %d\n", index);
}
}
done:
dev_kfree_skb_any(skb);
return 0;
}
/*
* 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;
struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
unsigned int pad;
int headroom = (priv->adapter->iface_type ==
MWIFIEX_USB) ? 0 : INTF_HEADER_LEN;
pad = ((void *)skb->data - sizeof(*local_tx_pd) -
headroom - NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1);
skb_push(skb, pad);
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) +
pad);
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) -
pad);
if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
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;
}
}
}
/*
* Packet send completion callback handler.
*
* It either frees the buffer directly or forwards it to another
* completion callback which checks conditions, updates statistics,
* wakes up stalled traffic queue if required, and then frees the buffer.
*/
int mwifiex_write_data_complete(struct mwifiex_adapter *adapter,
struct sk_buff *skb, int status)
{
struct mwifiex_private *priv, *tpriv;
struct mwifiex_txinfo *tx_info;
int i;
if (!skb)
return 0;
tx_info = MWIFIEX_SKB_TXCB(skb);
priv = mwifiex_get_priv_by_id(adapter, tx_info->bss_num,
tx_info->bss_type);
if (!priv)
goto done;
mwifiex_set_trans_start(priv->netdev);
if (!status) {
priv->stats.tx_packets++;
priv->stats.tx_bytes += skb->len;
} else {
priv->stats.tx_errors++;
}
if (atomic_dec_return(&adapter->tx_pending) >= LOW_TX_PENDING)
goto done;
for (i = 0; i < adapter->priv_num; i++) {
tpriv = adapter->priv[i];
if ((GET_BSS_ROLE(tpriv) == MWIFIEX_BSS_ROLE_STA) &&
(tpriv->media_connected)) {
if (netif_queue_stopped(tpriv->netdev))
mwifiex_wake_up_net_dev_queue(tpriv->netdev,
adapter);
}
}
done:
dev_kfree_skb_any(skb);
return 0;
}
/*
* CFG802.11 network device handler for data transmission.
*/
static int
mwifiex_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
struct sk_buff *new_skb;
struct mwifiex_txinfo *tx_info;
bool multicast;
dev_dbg(priv->adapter->dev, "data: %lu BSS(%d-%d): Data <= kernel\n",
jiffies, priv->bss_type, priv->bss_num);
if (priv->adapter->surprise_removed) {
kfree_skb(skb);
priv->stats.tx_dropped++;
return 0;
}
if (!skb->len || (skb->len > ETH_FRAME_LEN)) {
dev_err(priv->adapter->dev, "Tx: bad skb len %d\n", skb->len);
kfree_skb(skb);
priv->stats.tx_dropped++;
return 0;
}
if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
dev_dbg(priv->adapter->dev,
"data: Tx: insufficient skb headroom %d\n",
skb_headroom(skb));
/* Insufficient skb headroom - allocate a new skb */
new_skb =
skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
if (unlikely(!new_skb)) {
dev_err(priv->adapter->dev, "Tx: cannot alloca new_skb\n");
kfree_skb(skb);
priv->stats.tx_dropped++;
return 0;
}
kfree_skb(skb);
skb = new_skb;
dev_dbg(priv->adapter->dev, "info: new skb headroomd %d\n",
skb_headroom(skb));
}
tx_info = MWIFIEX_SKB_TXCB(skb);
memset(tx_info, 0, sizeof(*tx_info));
tx_info->bss_num = priv->bss_num;
tx_info->bss_type = priv->bss_type;
tx_info->pkt_len = skb->len;
multicast = is_multicast_ether_addr(skb->data);
if (unlikely(!multicast && skb->sk &&
skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS &&
priv->adapter->fw_api_ver == MWIFIEX_FW_V15))
skb = mwifiex_clone_skb_for_tx_status(priv,
skb,
MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS, NULL);
/* Record the current time the packet was queued; used to
* determine the amount of time the packet was queued in
* the driver before it was sent to the firmware.
* The delay is then sent along with the packet to the
* firmware for aggregate delay calculation for stats and
* MSDU lifetime expiry.
*/
__net_timestamp(skb);
if (ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
priv->bss_type == MWIFIEX_BSS_TYPE_STA &&
!ether_addr_equal_unaligned(priv->cfg_bssid, skb->data)) {
if (priv->adapter->auto_tdls && priv->check_tdls_tx)
mwifiex_tdls_check_tx(priv, skb);
}
mwifiex_queue_tx_pkt(priv, skb);
return 0;
}
/*
* This function tells firmware to send a NULL data packet.
*
* The function creates a NULL data packet with TxPD and sends to the
* firmware for transmission, with highest priority setting.
*/
int mwifiex_send_null_packet(struct mwifiex_private *priv, u8 flags)
{
struct mwifiex_adapter *adapter = priv->adapter;
struct txpd *local_tx_pd;
/* sizeof(struct txpd) + Interface specific header */
#define NULL_PACKET_HDR 64
u32 data_len = NULL_PACKET_HDR;
struct sk_buff *skb;
int ret;
struct mwifiex_txinfo *tx_info = NULL;
if (adapter->surprise_removed)
return -1;
if (!priv->media_connected)
return -1;
if (adapter->data_sent)
return -1;
skb = dev_alloc_skb(data_len);
if (!skb)
return -1;
tx_info = MWIFIEX_SKB_TXCB(skb);
tx_info->bss_index = priv->bss_index;
skb_reserve(skb, sizeof(struct txpd) + INTF_HEADER_LEN);
skb_push(skb, sizeof(struct txpd));
local_tx_pd = (struct txpd *) skb->data;
local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
local_tx_pd->flags = flags;
local_tx_pd->priority = WMM_HIGHEST_PRIORITY;
local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
local_tx_pd->bss_num = priv->bss_num;
local_tx_pd->bss_type = priv->bss_type;
skb_push(skb, INTF_HEADER_LEN);
ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
skb->data, skb->len, NULL);
switch (ret) {
case -EBUSY:
adapter->data_sent = true;
/* Fall through FAILURE handling */
case -1:
dev_kfree_skb_any(skb);
dev_err(adapter->dev, "%s: host_to_card failed: ret=%d\n",
__func__, ret);
adapter->dbg.num_tx_host_to_card_failure++;
break;
case 0:
dev_kfree_skb_any(skb);
dev_dbg(adapter->dev, "data: %s: host_to_card succeeded\n",
__func__);
adapter->tx_lock_flag = true;
break;
case -EINPROGRESS:
break;
default:
break;
}
return ret;
}
/*
* This function fills the TxPD for tx packets.
*
* The Tx buffer received by this function should already have the
* header space allocated for TxPD.
*
* This function inserts the TxPD in between interface header and actual
* data and adjusts the buffer pointers accordingly.
*
* The following TxPD fields are set by this function, as required -
* - BSS number
* - Tx packet length and offset
* - Priority
* - Packet delay
* - Priority specific Tx control
* - Flags
*/
void *mwifiex_process_sta_txpd(struct mwifiex_private *priv,
struct sk_buff *skb)
{
struct mwifiex_adapter *adapter = priv->adapter;
struct txpd *local_tx_pd;
struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
u8 pad;
if (!skb->len) {
dev_err(adapter->dev, "Tx: bad packet length: %d\n", skb->len);
tx_info->status_code = -1;
return skb->data;
}
/* If skb->data is not aligned; add padding */
pad = (4 - (((void *)skb->data - NULL) & 0x3)) % 4;
BUG_ON(skb_headroom(skb) < (sizeof(*local_tx_pd) + INTF_HEADER_LEN
+ pad));
skb_push(skb, sizeof(*local_tx_pd) + pad);
local_tx_pd = (struct txpd *) skb->data;
memset(local_tx_pd, 0, sizeof(struct txpd));
local_tx_pd->bss_num = priv->bss_num;
local_tx_pd->bss_type = priv->bss_type;
local_tx_pd->tx_pkt_length = cpu_to_le16((u16)(skb->len -
(sizeof(struct txpd)
+ pad)));
local_tx_pd->priority = (u8) skb->priority;
local_tx_pd->pkt_delay_2ms =
mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
if (local_tx_pd->priority <
ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
/*
* Set the priority specific tx_control field, setting of 0 will
* cause the default value to be used later in this function
*/
local_tx_pd->tx_control =
cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[local_tx_pd->
priority]);
if (adapter->pps_uapsd_mode) {
if (mwifiex_check_last_packet_indication(priv)) {
adapter->tx_lock_flag = true;
local_tx_pd->flags =
MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
}
}
/* Offset of actual data */
local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) + pad);
/* make space for INTF_HEADER_LEN */
skb_push(skb, INTF_HEADER_LEN);
if (!local_tx_pd->tx_control)
/* TxCtrl set by user or default */
local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
return skb->data;
}
static int mwifiex_usb_prepare_tx_aggr_skb(struct mwifiex_adapter *adapter,
struct usb_tx_data_port *port,
struct sk_buff **skb_send)
{
struct sk_buff *skb_aggr, *skb_tmp;
u8 *payload, pad;
u16 align = adapter->bus_aggr.tx_aggr_align;
struct mwifiex_txinfo *tx_info = NULL;
bool is_txinfo_set = false;
/* Packets in aggr_list will be send in either skb_aggr or
* write complete, delete the tx_aggr timer
*/
if (port->tx_aggr.timer_cnxt.is_hold_timer_set) {
del_timer(&port->tx_aggr.timer_cnxt.hold_timer);
port->tx_aggr.timer_cnxt.is_hold_timer_set = false;
port->tx_aggr.timer_cnxt.hold_tmo_msecs = 0;
}
skb_aggr = mwifiex_alloc_dma_align_buf(port->tx_aggr.aggr_len,
GFP_ATOMIC);
if (!skb_aggr) {
mwifiex_dbg(adapter, ERROR,
"%s: alloc skb_aggr failed\n", __func__);
while ((skb_tmp = skb_dequeue(&port->tx_aggr.aggr_list)))
mwifiex_write_data_complete(adapter, skb_tmp, 0, -1);
port->tx_aggr.aggr_num = 0;
port->tx_aggr.aggr_len = 0;
return -EBUSY;
}
tx_info = MWIFIEX_SKB_TXCB(skb_aggr);
memset(tx_info, 0, sizeof(*tx_info));
while ((skb_tmp = skb_dequeue(&port->tx_aggr.aggr_list))) {
/* padding for aligning next packet header*/
pad = (align - (skb_tmp->len & (align - 1))) % align;
payload = skb_put(skb_aggr, skb_tmp->len + pad);
memcpy(payload, skb_tmp->data, skb_tmp->len);
if (skb_queue_empty(&port->tx_aggr.aggr_list)) {
/* do not padding for last packet*/
*(u16 *)payload = cpu_to_le16(skb_tmp->len);
*(u16 *)&payload[2] =
cpu_to_le16(MWIFIEX_TYPE_AGGR_DATA_V2 | 0x80);
skb_trim(skb_aggr, skb_aggr->len - pad);
} else {
/* add aggregation interface header */
*(u16 *)payload = cpu_to_le16(skb_tmp->len + pad);
*(u16 *)&payload[2] =
cpu_to_le16(MWIFIEX_TYPE_AGGR_DATA_V2);
}
if (!is_txinfo_set) {
tx_info->bss_num = MWIFIEX_SKB_TXCB(skb_tmp)->bss_num;
tx_info->bss_type = MWIFIEX_SKB_TXCB(skb_tmp)->bss_type;
is_txinfo_set = true;
}
port->tx_aggr.aggr_num--;
port->tx_aggr.aggr_len -= (skb_tmp->len + pad);
mwifiex_write_data_complete(adapter, skb_tmp, 0, 0);
}
tx_info->pkt_len = skb_aggr->len -
(sizeof(struct txpd) + adapter->intf_hdr_len);
tx_info->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
port->tx_aggr.aggr_num = 0;
port->tx_aggr.aggr_len = 0;
*skb_send = skb_aggr;
return 0;
}
static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
struct sk_buff *skb)
{
struct mwifiex_adapter *adapter = priv->adapter;
struct uap_rxpd *uap_rx_pd;
struct rx_packet_hdr *rx_pkt_hdr;
struct sk_buff *new_skb;
struct mwifiex_txinfo *tx_info;
int hdr_chop;
struct timeval tv;
u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
uap_rx_pd = (struct uap_rxpd *)(skb->data);
rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
if ((atomic_read(&adapter->pending_bridged_pkts) >=
MWIFIEX_BRIDGED_PKTS_THRESHOLD)) {
dev_err(priv->adapter->dev,
"Tx: Bridge packet limit reached. Drop packet!\n");
kfree_skb(skb);
return;
}
if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)))
/* Chop off the rxpd + the excess memory from
* 802.2/llc/snap header that was removed.
*/
hdr_chop = (u8 *)eth_hdr - (u8 *)uap_rx_pd;
else
/* Chop off the rxpd */
hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
/* Chop off the leading header bytes so the it points
* to the start of either the reconstructed EthII frame
* or the 802.2/llc/snap frame.
*/
skb_pull(skb, hdr_chop);
if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
dev_dbg(priv->adapter->dev,
"data: Tx: insufficient skb headroom %d\n",
skb_headroom(skb));
/* Insufficient skb headroom - allocate a new skb */
new_skb =
skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
if (unlikely(!new_skb)) {
dev_err(priv->adapter->dev,
"Tx: cannot allocate new_skb\n");
kfree_skb(skb);
priv->stats.tx_dropped++;
return;
}
kfree_skb(skb);
skb = new_skb;
dev_dbg(priv->adapter->dev, "info: new skb headroom %d\n",
skb_headroom(skb));
}
tx_info = MWIFIEX_SKB_TXCB(skb);
tx_info->bss_num = priv->bss_num;
tx_info->bss_type = priv->bss_type;
tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
do_gettimeofday(&tv);
skb->tstamp = timeval_to_ktime(tv);
mwifiex_wmm_add_buf_txqueue(priv, skb);
atomic_inc(&adapter->tx_pending);
atomic_inc(&adapter->pending_bridged_pkts);
if ((atomic_read(&adapter->tx_pending) >= MAX_TX_PENDING)) {
mwifiex_set_trans_start(priv->netdev);
mwifiex_stop_net_dev_queue(priv->netdev, priv->adapter);
}
return;
}
