220 lines
6.8 KiB
C
220 lines
6.8 KiB
C
/*
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* Marvell Wireless LAN device driver: station RX data handling
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*
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* Copyright (C) 2011, Marvell International Ltd.
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*
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* This software file (the "File") is distributed by Marvell International
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* Ltd. under the terms of the GNU General Public License Version 2, June 1991
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* (the "License"). You may use, redistribute and/or modify this File in
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* accordance with the terms and conditions of the License, a copy of which
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* is available by writing to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
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* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
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*
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* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
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* this warranty disclaimer.
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*/
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#include "decl.h"
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#include "ioctl.h"
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#include "util.h"
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#include "fw.h"
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#include "main.h"
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#include "11n_aggr.h"
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#include "11n_rxreorder.h"
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/*
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* This function processes the received packet and forwards it
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* to kernel/upper layer.
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*
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* This function parses through the received packet and determines
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* if it is a debug packet or normal packet.
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*
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* For non-debug packets, the function chops off unnecessary leading
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* header bytes, reconstructs the packet as an ethernet frame or
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* 802.2/llc/snap frame as required, and sends it to kernel/upper layer.
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*
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* The completion callback is called after processing in complete.
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*/
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int mwifiex_process_rx_packet(struct mwifiex_adapter *adapter,
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struct sk_buff *skb)
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{
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int ret;
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struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
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struct mwifiex_private *priv =
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mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
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rx_info->bss_type);
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struct rx_packet_hdr *rx_pkt_hdr;
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struct rxpd *local_rx_pd;
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int hdr_chop;
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struct ethhdr *eth_hdr;
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u8 rfc1042_eth_hdr[ETH_ALEN] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
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local_rx_pd = (struct rxpd *) (skb->data);
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rx_pkt_hdr = (void *)local_rx_pd +
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le16_to_cpu(local_rx_pd->rx_pkt_offset);
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if (!memcmp(&rx_pkt_hdr->rfc1042_hdr,
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rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr))) {
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/*
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* Replace the 803 header and rfc1042 header (llc/snap) with an
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* EthernetII header, keep the src/dst and snap_type
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* (ethertype).
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* The firmware only passes up SNAP frames converting
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* all RX Data from 802.11 to 802.2/LLC/SNAP frames.
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* To create the Ethernet II, just move the src, dst address
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* right before the snap_type.
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*/
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eth_hdr = (struct ethhdr *)
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((u8 *) &rx_pkt_hdr->eth803_hdr
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+ sizeof(rx_pkt_hdr->eth803_hdr) +
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sizeof(rx_pkt_hdr->rfc1042_hdr)
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- sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
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- sizeof(rx_pkt_hdr->eth803_hdr.h_source)
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- sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
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memcpy(eth_hdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
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sizeof(eth_hdr->h_source));
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memcpy(eth_hdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
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sizeof(eth_hdr->h_dest));
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/* Chop off the rxpd + the excess memory from the 802.2/llc/snap
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header that was removed. */
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hdr_chop = (u8 *) eth_hdr - (u8 *) local_rx_pd;
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} else {
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/* Chop off the rxpd */
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hdr_chop = (u8 *) &rx_pkt_hdr->eth803_hdr -
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(u8 *) local_rx_pd;
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}
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/* Chop off the leading header bytes so the it points to the start of
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either the reconstructed EthII frame or the 802.2/llc/snap frame */
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skb_pull(skb, hdr_chop);
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priv->rxpd_rate = local_rx_pd->rx_rate;
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priv->rxpd_htinfo = local_rx_pd->ht_info;
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ret = mwifiex_recv_packet(adapter, skb);
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if (ret == -1)
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dev_err(adapter->dev, "recv packet failed\n");
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return ret;
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}
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/*
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* This function processes the received buffer.
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*
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* The function looks into the RxPD and performs sanity tests on the
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* received buffer to ensure its a valid packet, before processing it
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* further. If the packet is determined to be aggregated, it is
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* de-aggregated accordingly. Non-unicast packets are sent directly to
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* the kernel/upper layers. Unicast packets are handed over to the
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* Rx reordering routine if 11n is enabled.
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*
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* The completion callback is called after processing in complete.
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*/
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int mwifiex_process_sta_rx_packet(struct mwifiex_adapter *adapter,
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struct sk_buff *skb)
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{
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int ret = 0;
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struct rxpd *local_rx_pd;
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struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
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struct rx_packet_hdr *rx_pkt_hdr;
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u8 ta[ETH_ALEN];
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u16 rx_pkt_type, rx_pkt_offset, rx_pkt_length, seq_num;
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struct mwifiex_private *priv =
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mwifiex_get_priv_by_id(adapter, rx_info->bss_num,
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rx_info->bss_type);
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if (!priv)
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return -1;
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local_rx_pd = (struct rxpd *) (skb->data);
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rx_pkt_type = le16_to_cpu(local_rx_pd->rx_pkt_type);
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rx_pkt_offset = le16_to_cpu(local_rx_pd->rx_pkt_offset);
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rx_pkt_length = le16_to_cpu(local_rx_pd->rx_pkt_length);
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seq_num = le16_to_cpu(local_rx_pd->seq_num);
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rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
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if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
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dev_err(adapter->dev,
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"wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
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skb->len, rx_pkt_offset, rx_pkt_length);
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priv->stats.rx_dropped++;
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if (adapter->if_ops.data_complete)
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adapter->if_ops.data_complete(adapter, skb);
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else
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dev_kfree_skb_any(skb);
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return ret;
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}
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if (rx_pkt_type == PKT_TYPE_AMSDU) {
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struct sk_buff_head list;
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struct sk_buff *rx_skb;
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__skb_queue_head_init(&list);
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skb_pull(skb, rx_pkt_offset);
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skb_trim(skb, rx_pkt_length);
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ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
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priv->wdev->iftype, 0, false);
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while (!skb_queue_empty(&list)) {
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rx_skb = __skb_dequeue(&list);
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ret = mwifiex_recv_packet(adapter, rx_skb);
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if (ret == -1)
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dev_err(adapter->dev, "Rx of A-MSDU failed");
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}
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return 0;
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} else if (rx_pkt_type == PKT_TYPE_MGMT) {
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ret = mwifiex_process_mgmt_packet(adapter, skb);
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if (ret)
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dev_err(adapter->dev, "Rx of mgmt packet failed");
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dev_kfree_skb_any(skb);
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return ret;
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}
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/*
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* If the packet is not an unicast packet then send the packet
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* directly to os. Don't pass thru rx reordering
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*/
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if (!IS_11N_ENABLED(priv) ||
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memcmp(priv->curr_addr, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN)) {
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mwifiex_process_rx_packet(adapter, skb);
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return ret;
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}
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if (mwifiex_queuing_ra_based(priv)) {
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memcpy(ta, rx_pkt_hdr->eth803_hdr.h_source, ETH_ALEN);
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} else {
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if (rx_pkt_type != PKT_TYPE_BAR)
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priv->rx_seq[local_rx_pd->priority] = seq_num;
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memcpy(ta, priv->curr_bss_params.bss_descriptor.mac_address,
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ETH_ALEN);
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}
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/* Reorder and send to OS */
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ret = mwifiex_11n_rx_reorder_pkt(priv, seq_num, local_rx_pd->priority,
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ta, (u8) rx_pkt_type, skb);
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if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
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if (adapter->if_ops.data_complete)
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adapter->if_ops.data_complete(adapter, skb);
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else
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dev_kfree_skb_any(skb);
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}
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if (ret)
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priv->stats.rx_dropped++;
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return ret;
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}
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