wireless: mwifiex: initial commit for Marvell mwifiex driver

This driver adds WiFi support for Marvell 802.11n based chipsets
with SDIO interface. Currently only SD8787 is supported. More
chipsets will be supported later.

drivers/net/wireless/mwifiex/

Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Ramesh Radhakrishnan <rramesh@marvell.com>
Signed-off-by: Frank Huang <frankh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 182 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..8282679e64fd
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/sta_rx.c
@@ -0,0 +1,182 @@
+/*
+ * 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 = 0;
+	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 = 0;
+	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) {
+		mwifiex_11n_deaggregate_pkt(priv, skb);
+		return ret;
+	}
+	/*
+	 * 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;
+}