drivers/net/wireless/wl12xx/rx.c - kernel/mindspeed - Git at Google

 /*
  * This file is part of wl1271
  *
  * Copyright (C) 2009 Nokia Corporation
  *
  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  */

 #include <linux/gfp.h>
 #include <linux/sched.h>

 #include "wl12xx.h"
 #include "acx.h"
 #include "reg.h"
 #include "rx.h"
 #include "io.h"

 static u8 wl12xx_rx_get_mem_block(struct wl12xx_fw_status *status,
 				  u32 drv_rx_counter)
 {
 	return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
 		RX_MEM_BLOCK_MASK;
 }

 static u32 wl12xx_rx_get_buf_size(struct wl12xx_fw_status *status,
 				 u32 drv_rx_counter)
 {
 	return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
 		RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
 }

 static bool wl12xx_rx_get_unaligned(struct wl12xx_fw_status *status,
 				    u32 drv_rx_counter)
 {
 	/* Convert the value to bool */
 	return !!(le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
 		RX_BUF_UNALIGNED_PAYLOAD);
 }

 static void wl1271_rx_status(struct wl1271 *wl,
 			     struct wl1271_rx_descriptor *desc,
 			     struct ieee80211_rx_status *status,
 			     u8 beacon)
 {
 	memset(status, 0, sizeof(struct ieee80211_rx_status));

 	if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
 		status->band = IEEE80211_BAND_2GHZ;
 	else
 		status->band = IEEE80211_BAND_5GHZ;

 	status->rate_idx = wl1271_rate_to_idx(desc->rate, status->band);

 	/* 11n support */
 	if (desc->rate <= CONF_HW_RXTX_RATE_MCS0)
 		status->flag |= RX_FLAG_HT;

 	status->signal = desc->rssi;

 	/*
 	 * FIXME: In wl1251, the SNR should be divided by two.  In wl1271 we
 	 * need to divide by two for now, but TI has been discussing about
 	 * changing it.  This needs to be rechecked.
 	 */
 	wl->noise = desc->rssi - (desc->snr >> 1);

 	status->freq = ieee80211_channel_to_frequency(desc->channel,
 						      status->band);

 	if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
 		u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;

 		status->flag |= RX_FLAG_IV_STRIPPED | RX_FLAG_MMIC_STRIPPED |
 				RX_FLAG_DECRYPTED;

 		if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) {
 			status->flag |= RX_FLAG_MMIC_ERROR;
 			wl1271_warning("Michael MIC error");
 		}
 	}
 }

 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
 				 bool unaligned)
 {
 	struct wl1271_rx_descriptor *desc;
 	struct sk_buff *skb;
 	struct ieee80211_hdr *hdr;
 	u8 *buf;
 	u8 beacon = 0;
 	u8 is_data = 0;
 	u8 reserved = unaligned ? NET_IP_ALIGN : 0;
 	u16 seq_num;

 	/*
 	 * In PLT mode we seem to get frames and mac80211 warns about them,
 	 * workaround this by not retrieving them at all.
 	 */
 	if (unlikely(wl->state == WL1271_STATE_PLT))
 		return -EINVAL;

 	/* the data read starts with the descriptor */
 	desc = (struct wl1271_rx_descriptor *) data;

 	if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
 		size_t len = length - sizeof(*desc);
 		wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
 		wake_up_interruptible(&wl->fwlog_waitq);
 		return 0;
 	}

 	switch (desc->status & WL1271_RX_DESC_STATUS_MASK) {
 	/* discard corrupted packets */
 	case WL1271_RX_DESC_DRIVER_RX_Q_FAIL:
 	case WL1271_RX_DESC_DECRYPT_FAIL:
 		wl1271_warning("corrupted packet in RX with status: 0x%x",
 			       desc->status & WL1271_RX_DESC_STATUS_MASK);
 		return -EINVAL;
 	case WL1271_RX_DESC_SUCCESS:
 	case WL1271_RX_DESC_MIC_FAIL:
 		break;
 	default:
 		wl1271_error("invalid RX descriptor status: 0x%x",
 			     desc->status & WL1271_RX_DESC_STATUS_MASK);
 		return -EINVAL;
 	}

 	/* skb length not included rx descriptor */
 	skb = __dev_alloc_skb(length + reserved - sizeof(*desc), GFP_KERNEL);
 	if (!skb) {
 		wl1271_error("Couldn't allocate RX frame");
 		return -ENOMEM;
 	}

 	/* reserve the unaligned payload(if any) */
 	skb_reserve(skb, reserved);

 	buf = skb_put(skb, length - sizeof(*desc));

 	/*
 	 * Copy packets from aggregation buffer to the skbs without rx
 	 * descriptor and with packet payload aligned care. In case of unaligned
 	 * packets copy the packets in offset of 2 bytes guarantee IP header
 	 * payload aligned to 4 bytes.
 	 */
 	memcpy(buf, data + sizeof(*desc), length - sizeof(*desc));

 	hdr = (struct ieee80211_hdr *)skb->data;
 	if (ieee80211_is_beacon(hdr->frame_control))
 		beacon = 1;
 	if (ieee80211_is_data_present(hdr->frame_control))
 		is_data = 1;

 	wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);

 	seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
 	wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d", skb,
 		     skb->len - desc->pad_len,
 		     beacon ? "beacon" : "",
 		     seq_num);

 	skb_trim(skb, skb->len - desc->pad_len);

 	skb_queue_tail(&wl->deferred_rx_queue, skb);
 	queue_work(wl->freezable_wq, &wl->netstack_work);

 	return is_data;
 }

 void wl12xx_rx(struct wl1271 *wl, struct wl12xx_fw_status *status)
 {
 	struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
 	u32 buf_size;
 	u32 fw_rx_counter  = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 	u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
 	u32 rx_counter;
 	u32 mem_block;
 	u32 pkt_length;
 	u32 pkt_offset;
 	bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
 	bool had_data = false;
 	bool unaligned = false;

 	while (drv_rx_counter != fw_rx_counter) {
 		buf_size = 0;
 		rx_counter = drv_rx_counter;
 		while (rx_counter != fw_rx_counter) {
 			pkt_length = wl12xx_rx_get_buf_size(status, rx_counter);
 			if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE)
 				break;
 			buf_size += pkt_length;
 			rx_counter++;
 			rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
 		}

 		if (buf_size == 0) {
 			wl1271_warning("received empty data");
 			break;
 		}

 		if (wl->chip.id != CHIP_ID_1283_PG20) {
 			/*
 			 * Choose the block we want to read
 			 * For aggregated packets, only the first memory block
 			 * should be retrieved. The FW takes care of the rest.
 			 */
 			mem_block = wl12xx_rx_get_mem_block(status,
 							    drv_rx_counter);

 			wl->rx_mem_pool_addr.addr = (mem_block << 8) +
 			   le32_to_cpu(wl_mem_map->packet_memory_pool_start);

 			wl->rx_mem_pool_addr.addr_extra =
 				wl->rx_mem_pool_addr.addr + 4;

 			wl1271_write(wl, WL1271_SLV_REG_DATA,
 				     &wl->rx_mem_pool_addr,
 				     sizeof(wl->rx_mem_pool_addr), false);
 		}

 		/* Read all available packets at once */
 		wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
 				buf_size, true);

 		/* Split data into separate packets */
 		pkt_offset = 0;
 		while (pkt_offset < buf_size) {
 			pkt_length = wl12xx_rx_get_buf_size(status,
 					drv_rx_counter);

 			unaligned = wl12xx_rx_get_unaligned(status,
 					drv_rx_counter);

 			/*
 			 * the handle data call can only fail in memory-outage
 			 * conditions, in that case the received frame will just
 			 * be dropped.
 			 */
 			if (wl1271_rx_handle_data(wl,
 						  wl->aggr_buf + pkt_offset,
 						  pkt_length, unaligned) == 1)
 				had_data = true;

 			wl->rx_counter++;
 			drv_rx_counter++;
 			drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
 			pkt_offset += pkt_length;
 		}
 	}

 	/*
 	 * Write the driver's packet counter to the FW. This is only required
 	 * for older hardware revisions
 	 */
 	if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
 		wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);

 	if (!is_ap && wl->conf.rx_streaming.interval && had_data &&
 	    (wl->conf.rx_streaming.always ||
 	     test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) {
 		u32 timeout = wl->conf.rx_streaming.duration;

 		/* restart rx streaming */
 		if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags))
 			ieee80211_queue_work(wl->hw,
 					     &wl->rx_streaming_enable_work);

 		mod_timer(&wl->rx_streaming_timer,
 			  jiffies + msecs_to_jiffies(timeout));
 	}
 }
	/*
	* This file is part of wl1271
	*
	* Copyright (C) 2009 Nokia Corporation
	*
	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	*/

	#include <linux/gfp.h>
	#include <linux/sched.h>

	#include "wl12xx.h"
	#include "acx.h"
	#include "reg.h"
	#include "rx.h"
	#include "io.h"

	static u8 wl12xx_rx_get_mem_block(struct wl12xx_fw_status *status,
	u32 drv_rx_counter)
	{
	return le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
	RX_MEM_BLOCK_MASK;
	}

	static u32 wl12xx_rx_get_buf_size(struct wl12xx_fw_status *status,
	u32 drv_rx_counter)
	{
	return (le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
	RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
	}

	static bool wl12xx_rx_get_unaligned(struct wl12xx_fw_status *status,
	u32 drv_rx_counter)
	{
	/* Convert the value to bool */
	return !!(le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]) &
	RX_BUF_UNALIGNED_PAYLOAD);
	}

	static void wl1271_rx_status(struct wl1271 *wl,
	struct wl1271_rx_descriptor *desc,
	struct ieee80211_rx_status *status,
	u8 beacon)
	{
	memset(status, 0, sizeof(struct ieee80211_rx_status));

	if ((desc->flags & WL1271_RX_DESC_BAND_MASK) == WL1271_RX_DESC_BAND_BG)
	status->band = IEEE80211_BAND_2GHZ;
	else
	status->band = IEEE80211_BAND_5GHZ;

	status->rate_idx = wl1271_rate_to_idx(desc->rate, status->band);

	/* 11n support */
	if (desc->rate <= CONF_HW_RXTX_RATE_MCS0)
	status->flag \|= RX_FLAG_HT;

	status->signal = desc->rssi;

	/*
	* FIXME: In wl1251, the SNR should be divided by two. In wl1271 we
	* need to divide by two for now, but TI has been discussing about
	* changing it. This needs to be rechecked.
	*/
	wl->noise = desc->rssi - (desc->snr >> 1);

	status->freq = ieee80211_channel_to_frequency(desc->channel,
	status->band);

	if (desc->flags & WL1271_RX_DESC_ENCRYPT_MASK) {
	u8 desc_err_code = desc->status & WL1271_RX_DESC_STATUS_MASK;

	status->flag \|= RX_FLAG_IV_STRIPPED \| RX_FLAG_MMIC_STRIPPED \|
	RX_FLAG_DECRYPTED;

	if (unlikely(desc_err_code == WL1271_RX_DESC_MIC_FAIL)) {
	status->flag \|= RX_FLAG_MMIC_ERROR;
	wl1271_warning("Michael MIC error");
	}
	}
	}

	static int wl1271_rx_handle_data(struct wl1271 wl, u8 data, u32 length,
	bool unaligned)
	{
	struct wl1271_rx_descriptor *desc;
	struct sk_buff *skb;
	struct ieee80211_hdr *hdr;
	u8 *buf;
	u8 beacon = 0;
	u8 is_data = 0;
	u8 reserved = unaligned ? NET_IP_ALIGN : 0;
	u16 seq_num;

	/*
	* In PLT mode we seem to get frames and mac80211 warns about them,
	* workaround this by not retrieving them at all.
	*/
	if (unlikely(wl->state == WL1271_STATE_PLT))
	return -EINVAL;

	/* the data read starts with the descriptor */
	desc = (struct wl1271_rx_descriptor *) data;

	if (desc->packet_class == WL12XX_RX_CLASS_LOGGER) {
	size_t len = length - sizeof(*desc);
	wl12xx_copy_fwlog(wl, data + sizeof(*desc), len);
	wake_up_interruptible(&wl->fwlog_waitq);
	return 0;
	}

	switch (desc->status & WL1271_RX_DESC_STATUS_MASK) {
	/* discard corrupted packets */
	case WL1271_RX_DESC_DRIVER_RX_Q_FAIL:
	case WL1271_RX_DESC_DECRYPT_FAIL:
	wl1271_warning("corrupted packet in RX with status: 0x%x",
	desc->status & WL1271_RX_DESC_STATUS_MASK);
	return -EINVAL;
	case WL1271_RX_DESC_SUCCESS:
	case WL1271_RX_DESC_MIC_FAIL:
	break;
	default:
	wl1271_error("invalid RX descriptor status: 0x%x",
	desc->status & WL1271_RX_DESC_STATUS_MASK);
	return -EINVAL;
	}

	/* skb length not included rx descriptor */
	skb = __dev_alloc_skb(length + reserved - sizeof(*desc), GFP_KERNEL);
	if (!skb) {
	wl1271_error("Couldn't allocate RX frame");
	return -ENOMEM;
	}

	/* reserve the unaligned payload(if any) */
	skb_reserve(skb, reserved);

	buf = skb_put(skb, length - sizeof(*desc));

	/*
	* Copy packets from aggregation buffer to the skbs without rx
	* descriptor and with packet payload aligned care. In case of unaligned
	* packets copy the packets in offset of 2 bytes guarantee IP header
	* payload aligned to 4 bytes.
	*/
	memcpy(buf, data + sizeof(desc), length - sizeof(desc));

	hdr = (struct ieee80211_hdr *)skb->data;
	if (ieee80211_is_beacon(hdr->frame_control))
	beacon = 1;
	if (ieee80211_is_data_present(hdr->frame_control))
	is_data = 1;

	wl1271_rx_status(wl, desc, IEEE80211_SKB_RXCB(skb), beacon);

	seq_num = (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ) >> 4;
	wl1271_debug(DEBUG_RX, "rx skb 0x%p: %d B %s seq %d", skb,
	skb->len - desc->pad_len,
	beacon ? "beacon" : "",
	seq_num);

	skb_trim(skb, skb->len - desc->pad_len);

	skb_queue_tail(&wl->deferred_rx_queue, skb);
	queue_work(wl->freezable_wq, &wl->netstack_work);

	return is_data;
	}

	void wl12xx_rx(struct wl1271 wl, struct wl12xx_fw_status status)
	{
	struct wl1271_acx_mem_map *wl_mem_map = wl->target_mem_map;
	u32 buf_size;
	u32 fw_rx_counter = status->fw_rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	u32 drv_rx_counter = wl->rx_counter & NUM_RX_PKT_DESC_MOD_MASK;
	u32 rx_counter;
	u32 mem_block;
	u32 pkt_length;
	u32 pkt_offset;
	bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
	bool had_data = false;
	bool unaligned = false;

	while (drv_rx_counter != fw_rx_counter) {
	buf_size = 0;
	rx_counter = drv_rx_counter;
	while (rx_counter != fw_rx_counter) {
	pkt_length = wl12xx_rx_get_buf_size(status, rx_counter);
	if (buf_size + pkt_length > WL1271_AGGR_BUFFER_SIZE)
	break;
	buf_size += pkt_length;
	rx_counter++;
	rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
	}

	if (buf_size == 0) {
	wl1271_warning("received empty data");
	break;
	}

	if (wl->chip.id != CHIP_ID_1283_PG20) {
	/*
	* Choose the block we want to read
	* For aggregated packets, only the first memory block
	* should be retrieved. The FW takes care of the rest.
	*/
	mem_block = wl12xx_rx_get_mem_block(status,
	drv_rx_counter);

	wl->rx_mem_pool_addr.addr = (mem_block << 8) +
	le32_to_cpu(wl_mem_map->packet_memory_pool_start);

	wl->rx_mem_pool_addr.addr_extra =
	wl->rx_mem_pool_addr.addr + 4;

	wl1271_write(wl, WL1271_SLV_REG_DATA,
	&wl->rx_mem_pool_addr,
	sizeof(wl->rx_mem_pool_addr), false);
	}

	/* Read all available packets at once */
	wl1271_read(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
	buf_size, true);

	/* Split data into separate packets */
	pkt_offset = 0;
	while (pkt_offset < buf_size) {
	pkt_length = wl12xx_rx_get_buf_size(status,
	drv_rx_counter);

	unaligned = wl12xx_rx_get_unaligned(status,
	drv_rx_counter);

	/*
	* the handle data call can only fail in memory-outage
	* conditions, in that case the received frame will just
	* be dropped.
	*/
	if (wl1271_rx_handle_data(wl,
	wl->aggr_buf + pkt_offset,
	pkt_length, unaligned) == 1)
	had_data = true;

	wl->rx_counter++;
	drv_rx_counter++;
	drv_rx_counter &= NUM_RX_PKT_DESC_MOD_MASK;
	pkt_offset += pkt_length;
	}
	}

	/*
	* Write the driver's packet counter to the FW. This is only required
	* for older hardware revisions
	*/
	if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
	wl1271_write32(wl, RX_DRIVER_COUNTER_ADDRESS, wl->rx_counter);

	if (!is_ap && wl->conf.rx_streaming.interval && had_data &&
	(wl->conf.rx_streaming.always \|\|
	test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))) {
	u32 timeout = wl->conf.rx_streaming.duration;

	/* restart rx streaming */
	if (!test_bit(WL1271_FLAG_RX_STREAMING_STARTED, &wl->flags))
	ieee80211_queue_work(wl->hw,
	&wl->rx_streaming_enable_work);

	mod_timer(&wl->rx_streaming_timer,
	jiffies + msecs_to_jiffies(timeout));
	}
	}