/*
* 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 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_get_priv_by_id(adapter, rx_info->bss_num,
rx_info->bss_type);
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;
}
/*
* 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;
}
/*
* 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);
}
/*
* 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;
}
void mwifiex_process_multi_chan_event(struct mwifiex_private *priv,
struct sk_buff *event_skb)
{
struct mwifiex_ie_types_multi_chan_info *chan_info;
struct mwifiex_ie_types_mc_group_info *grp_info;
struct mwifiex_adapter *adapter = priv->adapter;
struct mwifiex_ie_types_header *tlv;
u16 tlv_buf_left, tlv_type, tlv_len;
int intf_num, bss_type, bss_num, i;
struct mwifiex_private *intf_priv;
tlv_buf_left = event_skb->len - sizeof(u32);
chan_info = (void *)event_skb->data + sizeof(u32);
if (le16_to_cpu(chan_info->header.type) != TLV_TYPE_MULTI_CHAN_INFO ||
tlv_buf_left < sizeof(struct mwifiex_ie_types_multi_chan_info)) {
mwifiex_dbg(adapter, ERROR,
"unknown TLV in chan_info event\n");
return;
}
adapter->usb_mc_status = le16_to_cpu(chan_info->status);
mwifiex_dbg(adapter, EVENT, "multi chan operation %s\n",
adapter->usb_mc_status ? "started" : "over");
tlv_buf_left -= sizeof(struct mwifiex_ie_types_multi_chan_info);
tlv = (struct mwifiex_ie_types_header *)chan_info->tlv_buffer;
while (tlv_buf_left >= (int)sizeof(struct mwifiex_ie_types_header)) {
tlv_type = le16_to_cpu(tlv->type);
tlv_len = le16_to_cpu(tlv->len);
if ((sizeof(struct mwifiex_ie_types_header) + tlv_len) >
tlv_buf_left) {
mwifiex_dbg(adapter, ERROR, "wrong tlv: tlvLen=%d,\t"
"tlvBufLeft=%d\n", tlv_len, tlv_buf_left);
break;
}
if (tlv_type != TLV_TYPE_MC_GROUP_INFO) {
mwifiex_dbg(adapter, ERROR, "wrong tlv type: 0x%x\n",
tlv_type);
break;
}
grp_info = (struct mwifiex_ie_types_mc_group_info *)tlv;
intf_num = grp_info->intf_num;
for (i = 0; i < intf_num; i++) {
bss_type = grp_info->bss_type_numlist[i] >> 4;
bss_num = grp_info->bss_type_numlist[i] & BSS_NUM_MASK;
intf_priv = mwifiex_get_priv_by_id(adapter, bss_num,
bss_type);
if (!intf_priv) {
mwifiex_dbg(adapter, ERROR,
"Invalid bss_type bss_num\t"
"in multi channel event\n");
continue;
}
if (adapter->iface_type == MWIFIEX_USB) {
u8 ep;
ep = grp_info->hid_num.usb_ep_num;
if (ep == MWIFIEX_USB_EP_DATA ||
ep == MWIFIEX_USB_EP_DATA_CH2)
intf_priv->usb_port = ep;
}
}
tlv_buf_left -= sizeof(struct mwifiex_ie_types_header) +
tlv_len;
tlv = (void *)((u8 *)tlv + tlv_len +
sizeof(struct mwifiex_ie_types_header));
}
if (adapter->iface_type == MWIFIEX_USB) {
adapter->tx_lock_flag = true;
adapter->usb_mc_setup = true;
mwifiex_multi_chan_resync(adapter);
}
}
/*
* 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 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;
}
