/*
* Packet receive completion callback handler.
*
* This function calls another completion callback handler which
* updates the statistics, and optionally updates the parent buffer
* use count before freeing the received packet.
*/
int mwifiex_recv_packet_complete(struct mwifiex_adapter *adapter,
struct sk_buff *skb, int status)
{
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct mwifiex_rxinfo *rx_info_parent;
struct mwifiex_private *priv;
struct sk_buff *skb_parent;
unsigned long flags;
priv = adapter->priv[rx_info->bss_index];
if (priv && (status == -1))
priv->stats.rx_dropped++;
if (rx_info->parent) {
skb_parent = rx_info->parent;
rx_info_parent = MWIFIEX_SKB_RXCB(skb_parent);
spin_lock_irqsave(&priv->rx_pkt_lock, flags);
--rx_info_parent->use_count;
if (!rx_info_parent->use_count) {
spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
dev_kfree_skb_any(skb_parent);
} else {
spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
}
} else {
dev_kfree_skb_any(skb);
}
return 0;
}
/*
* This function processes the received packet before sending it to the
* kernel.
*
* It extracts the SKB from the received buffer and sends it to kernel.
* In case the received buffer does not contain the data in SKB format,
* the function creates a blank SKB, fills it with the data from the
* received buffer and then sends this new SKB to the kernel.
*/
int mwifiex_recv_packet(struct mwifiex_adapter *adapter, struct sk_buff *skb)
{
struct mwifiex_rxinfo *rx_info;
struct mwifiex_private *priv;
if (!skb)
return -1;
rx_info = MWIFIEX_SKB_RXCB(skb);
priv = mwifiex_bss_index_to_priv(adapter, rx_info->bss_index);
if (!priv)
return -1;
skb->dev = priv->netdev;
skb->protocol = eth_type_trans(skb, priv->netdev);
skb->ip_summed = CHECKSUM_NONE;
priv->stats.rx_bytes += skb->len;
priv->stats.rx_packets++;
if (in_interrupt())
netif_rx(skb);
else
netif_rx_ni(skb);
return 0;
}
/*
* This function processes the received buffer.
*
* Main responsibility of this function is to parse the RxPD to
* identify the correct interface this packet is headed for and
* forwarding it to the associated handling function, where the
* packet will be further processed and sent to kernel/upper layer
* if required.
*/
int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
struct mwifiex_private *priv =
mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
struct rxpd *local_rx_pd;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
local_rx_pd = (struct rxpd *) (skb->data);
/* Get the BSS number from rxpd, get corresponding priv */
priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
BSS_NUM_MASK, local_rx_pd->bss_type);
if (!priv)
priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
if (!priv) {
dev_err(adapter->dev, "data: priv not found. Drop RX packet\n");
dev_kfree_skb_any(skb);
return -1;
}
rx_info->bss_num = priv->bss_num;
rx_info->bss_type = priv->bss_type;
if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
return mwifiex_process_uap_rx_packet(priv, skb);
return mwifiex_process_sta_rx_packet(priv, skb);
}
/*
* This function is used to shutdown the driver.
*
* The following operations are performed sequentially -
* - Check if already shut down
* - Make sure the main process has stopped
* - Clean up the Tx and Rx queues
* - Delete BSS priority tables
* - Free the adapter
* - Notify completion
*/
int
mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
{
int ret = -EINPROGRESS;
struct mwifiex_private *priv;
s32 i;
unsigned long flags;
struct sk_buff *skb;
/* mwifiex already shutdown */
if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
return 0;
adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
/* wait for mwifiex_process to complete */
if (adapter->mwifiex_processing) {
dev_warn(adapter->dev, "main process is still running\n");
return ret;
}
/* shut down mwifiex */
dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
/* Clean up Tx/Rx queues and delete BSS priority table */
for (i = 0; i < adapter->priv_num; i++) {
if (adapter->priv[i]) {
priv = adapter->priv[i];
mwifiex_clean_txrx(priv);
mwifiex_delete_bss_prio_tbl(priv);
}
}
spin_lock_irqsave(&adapter->mwifiex_lock, flags);
if (adapter->if_ops.data_complete) {
while ((skb = skb_dequeue(&adapter->usb_rx_data_q))) {
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
priv = adapter->priv[rx_info->bss_num];
if (priv)
priv->stats.rx_dropped++;
adapter->if_ops.data_complete(adapter, skb);
}
}
/* Free adapter structure */
mwifiex_free_adapter(adapter);
spin_unlock_irqrestore(&adapter->mwifiex_lock, flags);
/* Notify completion */
ret = mwifiex_shutdown_fw_complete(adapter);
return ret;
}
/*
* This function processes the received buffer.
*
* Main responsibility of this function is to parse the RxPD to
* identify the correct interface this packet is headed for and
* forwarding it to the associated handling function, where the
* packet will be further processed and sent to kernel/upper layer
* if required.
*/
int mwifiex_handle_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
struct mwifiex_private *priv =
mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
struct rxpd *local_rx_pd;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
local_rx_pd = (struct rxpd *) (skb->data);
/* Get the BSS number from rxpd, get corresponding priv */
priv = mwifiex_get_priv_by_id(adapter, local_rx_pd->bss_num &
BSS_NUM_MASK, local_rx_pd->bss_type);
if (!priv)
priv = mwifiex_get_priv(adapter, MWIFIEX_BSS_ROLE_ANY);
rx_info->bss_index = priv->bss_index;
return mwifiex_process_sta_rx_packet(adapter, skb);
}
static int mwifiex_process_rx(struct mwifiex_adapter *adapter)
{
unsigned long flags;
struct sk_buff *skb;
struct mwifiex_rxinfo *rx_info;
spin_lock_irqsave(&adapter->rx_proc_lock, flags);
if (adapter->rx_processing || adapter->rx_locked) {
spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
goto exit_rx_proc;
} else {
adapter->rx_processing = true;
spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
}
/* Check for Rx data */
while ((skb = skb_dequeue(&adapter->rx_data_q))) {
atomic_dec(&adapter->rx_pending);
if ((adapter->delay_main_work ||
adapter->iface_type == MWIFIEX_USB) &&
(atomic_read(&adapter->rx_pending) < LOW_RX_PENDING)) {
if (adapter->if_ops.submit_rem_rx_urbs)
adapter->if_ops.submit_rem_rx_urbs(adapter);
adapter->delay_main_work = false;
mwifiex_queue_main_work(adapter);
}
rx_info = MWIFIEX_SKB_RXCB(skb);
if (rx_info->buf_type == MWIFIEX_TYPE_AGGR_DATA) {
if (adapter->if_ops.deaggr_pkt)
adapter->if_ops.deaggr_pkt(adapter, skb);
dev_kfree_skb_any(skb);
} else {
mwifiex_handle_rx_packet(adapter, skb);
}
}
spin_lock_irqsave(&adapter->rx_proc_lock, flags);
adapter->rx_processing = false;
spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
exit_rx_proc:
return 0;
}
/*
* This function is used to shutdown the driver.
*
* The following operations are performed sequentially -
* - Check if already shut down
* - Make sure the main process has stopped
* - Clean up the Tx and Rx queues
* - Delete BSS priority tables
* - Free the adapter
* - Notify completion
*/
int
mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
{
int ret = -EINPROGRESS;
struct mwifiex_private *priv;
s32 i;
unsigned long flags;
struct sk_buff *skb;
/* mwifiex already shutdown */
if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
return 0;
adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
/* wait for mwifiex_process to complete */
if (adapter->mwifiex_processing) {
mwifiex_dbg(adapter, WARN,
"main process is still running\n");
return ret;
}
/* cancel current command */
if (adapter->curr_cmd) {
mwifiex_dbg(adapter, WARN,
"curr_cmd is still in processing\n");
del_timer_sync(&adapter->cmd_timer);
mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
adapter->curr_cmd = NULL;
}
/* shut down mwifiex */
mwifiex_dbg(adapter, MSG,
"info: shutdown mwifiex...\n");
/* Clean up Tx/Rx queues and delete BSS priority table */
for (i = 0; i < adapter->priv_num; i++) {
if (adapter->priv[i]) {
priv = adapter->priv[i];
mwifiex_clean_auto_tdls(priv);
mwifiex_abort_cac(priv);
mwifiex_clean_txrx(priv);
mwifiex_delete_bss_prio_tbl(priv);
}
}
atomic_set(&adapter->tx_queued, 0);
while ((skb = skb_dequeue(&adapter->tx_data_q)))
mwifiex_write_data_complete(adapter, skb, 0, 0);
spin_lock_irqsave(&adapter->rx_proc_lock, flags);
while ((skb = skb_dequeue(&adapter->rx_data_q))) {
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
atomic_dec(&adapter->rx_pending);
priv = adapter->priv[rx_info->bss_num];
if (priv)
priv->stats.rx_dropped++;
dev_kfree_skb_any(skb);
}
spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
spin_lock(&adapter->mwifiex_lock);
mwifiex_adapter_cleanup(adapter);
spin_unlock(&adapter->mwifiex_lock);
/* Notify completion */
ret = mwifiex_shutdown_fw_complete(adapter);
return ret;
}
/*
* This function processes the received packet and forwards it
* to kernel/upper layer.
*
* This function parses through the received packet and determines
* if it is a debug packet or normal packet.
*
* For non-debug packets, the function chops off unnecessary leading
* header bytes, reconstructs the packet as an ethernet frame or
* 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
*
* The completion callback is called after processing in complete.
*/
int mwifiex_process_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
int ret;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct mwifiex_private *priv =
mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
rx_info->bss_type);
struct rx_packet_hdr *rx_pkt_hdr;
struct rxpd *local_rx_pd;
int hdr_chop;
struct ethhdr *eth_hdr;
u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
local_rx_pd = (struct rxpd *) (skb->data);
rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
local_rx_pd->rx_pkt_offset);
if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
/*
* Replace the 803 header and rfc1042 header (llc/snap) with an
* EthernetII header, keep the src/dst and snap_type
* (ethertype).
* The firmware only passes up SNAP frames converting
* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
* To create the Ethernet II, just move the src, dst address
* right before the snap_type.
*/
eth_hdr = (struct ethhdr *)
((u8 *) &rx_pkt_hdr->eth803_hdr
+ sizeof(rx_pkt_hdr->eth803_hdr) +
sizeof(rx_pkt_hdr->rfc1042_hdr)
- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
sizeof(eth_hdr->h_source));
memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
sizeof(eth_hdr->h_dest));
/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
header that was removed. */
hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
} else {
/* Chop off the rxpd */
hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
(u8 *) local_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);
priv->rxpd_rate = local_rx_pd->rx_rate;
priv->rxpd_htinfo = local_rx_pd->ht_info;
ret = mwifiex_recv_packet(adapter, skb);
if (ret == -1)
dev_err(adapter->dev, "recv packet failed\n");
return ret;
}
/*
* This function processes the received buffer.
*
* The function looks into the RxPD and performs sanity tests on the
* received buffer to ensure its a valid packet, before processing it
* further. If the packet is determined to be aggregated, it is
* de-aggregated accordingly. Non-unicast packets are sent directly to
* the kernel/upper layers. Unicast packets are handed over to the
* Rx reordering routine if 11n is enabled.
*
* The completion callback is called after processing in complete.
*/
int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
int ret = 0;
struct rxpd *local_rx_pd;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct rx_packet_hdr *rx_pkt_hdr;
u8 ta[ETH_ALEN];
u16 rx_pkt_type;
struct mwifiex_private *priv =
mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
rx_info->bss_type);
if (!priv)
return -1;
local_rx_pd = (struct rxpd *) (skb->data);
rx_pkt_type = local_rx_pd->rx_pkt_type;
rx_pkt_hdr = (struct rx_packet_hdr *) ((u8 *) local_rx_pd +
local_rx_pd->rx_pkt_offset);
if ((local_rx_pd->rx_pkt_offset + local_rx_pd->rx_pkt_length) >
(u16) skb->len) {
dev_err(adapter->dev, "wrong rx packet: len=%d,"
" rx_pkt_offset=%d, rx_pkt_length=%d\n", skb->len,
local_rx_pd->rx_pkt_offset, local_rx_pd->rx_pkt_length);
priv->stats.rx_dropped++;
dev_kfree_skb_any(skb);
return ret;
}
if (local_rx_pd->rx_pkt_type == PKT_TYPE_AMSDU) {
struct sk_buff_head list;
struct sk_buff *rx_skb;
__skb_queue_head_init(&list);
skb_pull(skb, local_rx_pd->rx_pkt_offset);
skb_trim(skb, local_rx_pd->rx_pkt_length);
ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
priv->wdev->iftype, 0, false);
while (!skb_queue_empty(&list)) {
rx_skb = __skb_dequeue(&list);
ret = mwifiex_recv_packet(adapter, rx_skb);
if (ret == -1)
dev_err(adapter->dev, "Rx of A-MSDU failed");
}
return 0;
}
/*
* If the packet is not an unicast packet then send the packet
* directly to os. Don't pass thru rx reordering
*/
if (!IS_11N_ENABLED(priv) ||
memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
mwifiex_process_rx_packet(adapter, skb);
return ret;
}
if (mwifiex_queuing_ra_based(priv)) {
memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
} else {
if (rx_pkt_type != PKT_TYPE_BAR)
priv->rx_seq[local_rx_pd->priority] =
local_rx_pd->seq_num;
memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
ETH_ALEN);
}
/* Reorder and send to OS */
ret = mwifiex_11n_rx_reorder_pkt(priv, local_rx_pd->seq_num,
local_rx_pd->priority, ta,
(u8) local_rx_pd->rx_pkt_type,
skb);
if (ret || (rx_pkt_type == PKT_TYPE_BAR))
dev_kfree_skb_any(skb);
if (ret)
priv->stats.rx_dropped++;
return ret;
}
/*
* This function is used to shutdown the driver.
*
* The following operations are performed sequentially -
* - Check if already shut down
* - Make sure the main process has stopped
* - Clean up the Tx and Rx queues
* - Delete BSS priority tables
* - Free the adapter
* - Notify completion
*/
int
mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
{
int ret = -EINPROGRESS;
struct mwifiex_private *priv;
s32 i;
struct sk_buff *skb;
/* mwifiex already shutdown */
if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
return 0;
adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
/* wait for mwifiex_process to complete */
if (adapter->mwifiex_processing) {
dev_warn(adapter->dev, "main process is still running\n");
return ret;
}
/* cancel current command */
if (adapter->curr_cmd) {
dev_warn(adapter->dev, "curr_cmd is still in processing\n");
del_timer(&adapter->cmd_timer);
mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
adapter->curr_cmd = NULL;
}
/* shut down mwifiex */
dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
/* Clean up Tx/Rx queues and delete BSS priority table */
for (i = 0; i < adapter->priv_num; i++) {
if (adapter->priv[i]) {
priv = adapter->priv[i];
mwifiex_clean_txrx(priv);
mwifiex_delete_bss_prio_tbl(priv);
}
}
spin_lock(&adapter->mwifiex_lock);
if (adapter->if_ops.data_complete) {
while ((skb = skb_dequeue(&adapter->usb_rx_data_q))) {
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
priv = adapter->priv[rx_info->bss_num];
if (priv)
priv->stats.rx_dropped++;
dev_kfree_skb_any(skb);
adapter->if_ops.data_complete(adapter);
}
}
mwifiex_adapter_cleanup(adapter);
spin_unlock(&adapter->mwifiex_lock);
/* Notify completion */
ret = mwifiex_shutdown_fw_complete(adapter);
return ret;
}
/*
* This function processes the packet received on AP interface.
*
* The function looks into the RxPD and performs sanity tests on the
* received buffer to ensure its a valid packet before processing it
* further. If the packet is determined to be aggregated, it is
* de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
*
* The completion callback is called after processing is complete.
*/
int mwifiex_process_uap_rx_packet(struct mwifiex_adapter *adapter,
struct sk_buff *skb)
{
int ret;
struct uap_rxpd *uap_rx_pd;
struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
struct rx_packet_hdr *rx_pkt_hdr;
u16 rx_pkt_type;
u8 ta[ETH_ALEN], pkt_type;
struct mwifiex_sta_node *node;
struct mwifiex_private *priv =
mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
rx_info->bss_type);
if (!priv)
return -1;
uap_rx_pd = (struct uap_rxpd *)(skb->data);
rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
dev_err(adapter->dev,
"wrong rx packet: len=%d, offset=%d, length=%d\n",
skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
le16_to_cpu(uap_rx_pd->rx_pkt_length));
priv->stats.rx_dropped++;
if (adapter->if_ops.data_complete)
adapter->if_ops.data_complete(adapter, skb);
else
dev_kfree_skb_any(skb);
return 0;
}
if (le16_to_cpu(uap_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
struct sk_buff_head list;
struct sk_buff *rx_skb;
__skb_queue_head_init(&list);
skb_pull(skb, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
skb_trim(skb, le16_to_cpu(uap_rx_pd->rx_pkt_length));
ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
priv->wdev->iftype, 0, false);
while (!skb_queue_empty(&list)) {
rx_skb = __skb_dequeue(&list);
ret = mwifiex_recv_packet(adapter, rx_skb);
if (ret)
dev_err(adapter->dev,
"AP:Rx A-MSDU failed");
}
return 0;
}
memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
node = mwifiex_get_sta_entry(priv, ta);
if (node)
node->rx_seq[uap_rx_pd->priority] =
le16_to_cpu(uap_rx_pd->seq_num);
}
if (!priv->ap_11n_enabled ||
(!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
(le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
ret = mwifiex_handle_uap_rx_forward(priv, skb);
return ret;
}
/* Reorder and send to kernel */
pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
uap_rx_pd->priority, ta, pkt_type,
skb);
if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
if (adapter->if_ops.data_complete)
adapter->if_ops.data_complete(adapter, skb);
else
dev_kfree_skb_any(skb);
}
if (ret)
priv->stats.rx_dropped++;
return ret;
}