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path: root/drivers/net/wireless/mwifiex/sta_rx.c
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Diffstat (limited to 'drivers/net/wireless/mwifiex/sta_rx.c')
-rw-r--r--drivers/net/wireless/mwifiex/sta_rx.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/net/wireless/mwifiex/sta_rx.c b/drivers/net/wireless/mwifiex/sta_rx.c
new file mode 100644
index 000000000000..1fdddece7479
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/sta_rx.c
@@ -0,0 +1,200 @@
+/*
+ * Marvell Wireless LAN device driver: station RX data handling
+ *
+ * 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 "11n_aggr.h"
+#include "11n_rxreorder.h"
+
+/*
+ * 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 = adapter->priv[rx_info->bss_index];
+ 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 = adapter->priv[rx_info->bss_index];
+
+ 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,
+ (void *) skb);
+
+ if (ret || (rx_pkt_type == PKT_TYPE_BAR)) {
+ if (priv && (ret == -1))
+ priv->stats.rx_dropped++;
+
+ dev_kfree_skb_any(skb);
+ }
+
+ return ret;
+}