drivers/net/wireless/ti/wlcore/rx.c - vendor/opensource/backports - 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 "wlcore.h"
 #include "debug.h"
 #include "acx.h"
 #include "rx.h"
 #include "tx.h"
 #include "io.h"
 #include "hw_ops.h"

 /*
  * TODO: this is here just for now, it must be removed when the data
  * operations are in place.
  */
 #include "../wl12xx/reg.h"

 static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
 				  u32 rx_pkt_desc)
 {
 	if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
 		return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >>
 		       ALIGNED_RX_BUF_SIZE_SHIFT;

 	return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
 }

 static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
 {
 	if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
 		return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);

 	return pkt_len;
 }

 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 = wlcore_rate_to_idx(wl, desc->rate, status->band);

 	/* 11n support */
 	if (desc->rate <= wl->hw_min_ht_rate)
 		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. Desc: 0x%x",
 				       desc_err_code);
 		}
 	}

 	if (beacon)
 		wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
 						status->band);
 }

 static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length,
 				 enum wl_rx_buf_align rx_align, u8 *hlid)
 {
 	struct wl1271_rx_descriptor *desc;
 	struct sk_buff *skb;
 	struct ieee80211_hdr *hdr;
 	u8 *buf;
 	u8 beacon = 0;
 	u8 is_data = 0;
 	u8 reserved = 0, offset_to_data = 0;
 	u16 seq_num;
 	u32 pkt_data_len;

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

 	pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
 	if (!pkt_data_len) {
 		wl1271_error("Invalid packet arrived from HW. length %d",
 			     length);
 		return -EINVAL;
 	}

 	if (rx_align == WLCORE_RX_BUF_UNALIGNED)
 		reserved = RX_BUF_ALIGN;
 	else if (rx_align == WLCORE_RX_BUF_PADDED)
 		offset_to_data = RX_BUF_ALIGN;

 	/* 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;
 	}

 	/* discard corrupted packets */
 	if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
 		hdr = (void *)(data + sizeof(*desc) + offset_to_data);
 		wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
 			       desc->status & WL1271_RX_DESC_STATUS_MASK,
 			       pkt_data_len);
 		wl1271_dump((DEBUG_RX|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
 			    min(pkt_data_len,
 				ieee80211_hdrlen(hdr->frame_control)));
 		return -EINVAL;
 	}

 	/* skb length not including rx descriptor */
 	skb = __dev_alloc_skb(pkt_data_len + reserved, 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, pkt_data_len);

 	/*
 	 * 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), pkt_data_len);
 	if (rx_align == WLCORE_RX_BUF_PADDED)
 		skb_pull(skb, RX_BUF_ALIGN);

 	*hlid = desc->hlid;

 	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);
 	wlcore_hw_set_rx_csum(wl, desc, skb);

 	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 hlid %d", skb,
 		     skb->len - desc->pad_len,
 		     beacon ? "beacon" : "",
 		     seq_num, *hlid);

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

 	return is_data;
 }

 int wlcore_rx(struct wl1271 *wl, struct wl_fw_status *status)
 {
 	unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
 	u32 buf_size;
 	u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
 	u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
 	u32 rx_counter;
 	u32 pkt_len, align_pkt_len;
 	u32 pkt_offset, des;
 	u8 hlid;
 	enum wl_rx_buf_align rx_align;
 	int ret = 0;

 	while (drv_rx_counter != fw_rx_counter) {
 		buf_size = 0;
 		rx_counter = drv_rx_counter;
 		while (rx_counter != fw_rx_counter) {
 			des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
 			pkt_len = wlcore_rx_get_buf_size(wl, des);
 			align_pkt_len = wlcore_rx_get_align_buf_size(wl,
 								     pkt_len);
 			if (buf_size + align_pkt_len > wl->aggr_buf_size)
 				break;
 			buf_size += align_pkt_len;
 			rx_counter++;
 			rx_counter %= wl->num_rx_desc;
 		}

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

 		/* Read all available packets at once */
 		des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 		ret = wlcore_hw_prepare_read(wl, des, buf_size);
 		if (ret < 0)
 			goto out;

 		ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
 				       buf_size, true);
 		if (ret < 0)
 			goto out;

 		/* Split data into separate packets */
 		pkt_offset = 0;
 		while (pkt_offset < buf_size) {
 			des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
 			pkt_len = wlcore_rx_get_buf_size(wl, des);
 			rx_align = wlcore_hw_get_rx_buf_align(wl, des);

 			/*
 			 * 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_len, rx_align,
 						  &hlid) == 1) {
 				if (hlid < wl->num_links)
 					__set_bit(hlid, active_hlids);
 				else
 					WARN(1,
 					     "hlid (%d) exceeded MAX_LINKS\n",
 					     hlid);
 			}

 			wl->rx_counter++;
 			drv_rx_counter++;
 			drv_rx_counter %= wl->num_rx_desc;
 			pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
 		}
 	}

 	/*
 	 * Write the driver's packet counter to the FW. This is only required
 	 * for older hardware revisions
 	 */
 	if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
 		ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
 				     wl->rx_counter);
 		if (ret < 0)
 			goto out;
 	}

 	wl12xx_rearm_rx_streaming(wl, active_hlids);

 out:
 	return ret;
 }

 #ifdef CONFIG_PM
 int wl1271_rx_filter_enable(struct wl1271 *wl,
 			    int index, bool enable,
 			    struct wl12xx_rx_filter *filter)
 {
 	int ret;

 	if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
 		wl1271_warning("Request to enable an already "
 			     "enabled rx filter %d", index);
 		return 0;
 	}

 	ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);

 	if (ret) {
 		wl1271_error("Failed to %s rx data filter %d (err=%d)",
 			     enable ? "enable" : "disable", index, ret);
 		return ret;
 	}

 	if (enable)
 		__set_bit(index, wl->rx_filter_enabled);
 	else
 		__clear_bit(index, wl->rx_filter_enabled);

 	return 0;
 }

 int wl1271_rx_filter_clear_all(struct wl1271 *wl)
 {
 	int i, ret = 0;

 	for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
 		if (!test_bit(i, wl->rx_filter_enabled))
 			continue;
 		ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
 		if (ret)
 			goto out;
 	}

 out:
 	return ret;
 }
 #endif /* CONFIG_PM */
	/*
	* 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 "wlcore.h"
	#include "debug.h"
	#include "acx.h"
	#include "rx.h"
	#include "tx.h"
	#include "io.h"
	#include "hw_ops.h"

	/*
	* TODO: this is here just for now, it must be removed when the data
	* operations are in place.
	*/
	#include "../wl12xx/reg.h"

	static u32 wlcore_rx_get_buf_size(struct wl1271 *wl,
	u32 rx_pkt_desc)
	{
	if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
	return (rx_pkt_desc & ALIGNED_RX_BUF_SIZE_MASK) >>
	ALIGNED_RX_BUF_SIZE_SHIFT;

	return (rx_pkt_desc & RX_BUF_SIZE_MASK) >> RX_BUF_SIZE_SHIFT_DIV;
	}

	static u32 wlcore_rx_get_align_buf_size(struct wl1271 *wl, u32 pkt_len)
	{
	if (wl->quirks & WLCORE_QUIRK_RX_BLOCKSIZE_ALIGN)
	return ALIGN(pkt_len, WL12XX_BUS_BLOCK_SIZE);

	return pkt_len;
	}

	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 = wlcore_rate_to_idx(wl, desc->rate, status->band);

	/* 11n support */
	if (desc->rate <= wl->hw_min_ht_rate)
	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. Desc: 0x%x",
	desc_err_code);
	}
	}

	if (beacon)
	wlcore_set_pending_regdomain_ch(wl, (u16)desc->channel,
	status->band);
	}

	static int wl1271_rx_handle_data(struct wl1271 wl, u8 data, u32 length,
	enum wl_rx_buf_align rx_align, u8 *hlid)
	{
	struct wl1271_rx_descriptor *desc;
	struct sk_buff *skb;
	struct ieee80211_hdr *hdr;
	u8 *buf;
	u8 beacon = 0;
	u8 is_data = 0;
	u8 reserved = 0, offset_to_data = 0;
	u16 seq_num;
	u32 pkt_data_len;

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

	pkt_data_len = wlcore_hw_get_rx_packet_len(wl, data, length);
	if (!pkt_data_len) {
	wl1271_error("Invalid packet arrived from HW. length %d",
	length);
	return -EINVAL;
	}

	if (rx_align == WLCORE_RX_BUF_UNALIGNED)
	reserved = RX_BUF_ALIGN;
	else if (rx_align == WLCORE_RX_BUF_PADDED)
	offset_to_data = RX_BUF_ALIGN;

	/* 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;
	}

	/* discard corrupted packets */
	if (desc->status & WL1271_RX_DESC_DECRYPT_FAIL) {
	hdr = (void )(data + sizeof(desc) + offset_to_data);
	wl1271_warning("corrupted packet in RX: status: 0x%x len: %d",
	desc->status & WL1271_RX_DESC_STATUS_MASK,
	pkt_data_len);
	wl1271_dump((DEBUG_RX\|DEBUG_CMD), "PKT: ", data + sizeof(*desc),
	min(pkt_data_len,
	ieee80211_hdrlen(hdr->frame_control)));
	return -EINVAL;
	}

	/* skb length not including rx descriptor */
	skb = __dev_alloc_skb(pkt_data_len + reserved, 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, pkt_data_len);

	/*
	* 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), pkt_data_len);
	if (rx_align == WLCORE_RX_BUF_PADDED)
	skb_pull(skb, RX_BUF_ALIGN);

	*hlid = desc->hlid;

	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);
	wlcore_hw_set_rx_csum(wl, desc, skb);

	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 hlid %d", skb,
	skb->len - desc->pad_len,
	beacon ? "beacon" : "",
	seq_num, *hlid);

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

	return is_data;
	}

	int wlcore_rx(struct wl1271 wl, struct wl_fw_status status)
	{
	unsigned long active_hlids[BITS_TO_LONGS(WLCORE_MAX_LINKS)] = {0};
	u32 buf_size;
	u32 fw_rx_counter = status->fw_rx_counter % wl->num_rx_desc;
	u32 drv_rx_counter = wl->rx_counter % wl->num_rx_desc;
	u32 rx_counter;
	u32 pkt_len, align_pkt_len;
	u32 pkt_offset, des;
	u8 hlid;
	enum wl_rx_buf_align rx_align;
	int ret = 0;

	while (drv_rx_counter != fw_rx_counter) {
	buf_size = 0;
	rx_counter = drv_rx_counter;
	while (rx_counter != fw_rx_counter) {
	des = le32_to_cpu(status->rx_pkt_descs[rx_counter]);
	pkt_len = wlcore_rx_get_buf_size(wl, des);
	align_pkt_len = wlcore_rx_get_align_buf_size(wl,
	pkt_len);
	if (buf_size + align_pkt_len > wl->aggr_buf_size)
	break;
	buf_size += align_pkt_len;
	rx_counter++;
	rx_counter %= wl->num_rx_desc;
	}

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

	/* Read all available packets at once */
	des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
	ret = wlcore_hw_prepare_read(wl, des, buf_size);
	if (ret < 0)
	goto out;

	ret = wlcore_read_data(wl, REG_SLV_MEM_DATA, wl->aggr_buf,
	buf_size, true);
	if (ret < 0)
	goto out;

	/* Split data into separate packets */
	pkt_offset = 0;
	while (pkt_offset < buf_size) {
	des = le32_to_cpu(status->rx_pkt_descs[drv_rx_counter]);
	pkt_len = wlcore_rx_get_buf_size(wl, des);
	rx_align = wlcore_hw_get_rx_buf_align(wl, des);

	/*
	* 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_len, rx_align,
	&hlid) == 1) {
	if (hlid < wl->num_links)
	__set_bit(hlid, active_hlids);
	else
	WARN(1,
	"hlid (%d) exceeded MAX_LINKS\n",
	hlid);
	}

	wl->rx_counter++;
	drv_rx_counter++;
	drv_rx_counter %= wl->num_rx_desc;
	pkt_offset += wlcore_rx_get_align_buf_size(wl, pkt_len);
	}
	}

	/*
	* Write the driver's packet counter to the FW. This is only required
	* for older hardware revisions
	*/
	if (wl->quirks & WLCORE_QUIRK_END_OF_TRANSACTION) {
	ret = wlcore_write32(wl, WL12XX_REG_RX_DRIVER_COUNTER,
	wl->rx_counter);
	if (ret < 0)
	goto out;
	}

	wl12xx_rearm_rx_streaming(wl, active_hlids);

	out:
	return ret;
	}

	#ifdef CONFIG_PM
	int wl1271_rx_filter_enable(struct wl1271 *wl,
	int index, bool enable,
	struct wl12xx_rx_filter *filter)
	{
	int ret;

	if (!!test_bit(index, wl->rx_filter_enabled) == enable) {
	wl1271_warning("Request to enable an already "
	"enabled rx filter %d", index);
	return 0;
	}

	ret = wl1271_acx_set_rx_filter(wl, index, enable, filter);

	if (ret) {
	wl1271_error("Failed to %s rx data filter %d (err=%d)",
	enable ? "enable" : "disable", index, ret);
	return ret;
	}

	if (enable)
	__set_bit(index, wl->rx_filter_enabled);
	else
	__clear_bit(index, wl->rx_filter_enabled);

	return 0;
	}

	int wl1271_rx_filter_clear_all(struct wl1271 *wl)
	{
	int i, ret = 0;

	for (i = 0; i < WL1271_MAX_RX_FILTERS; i++) {
	if (!test_bit(i, wl->rx_filter_enabled))
	continue;
	ret = wl1271_rx_filter_enable(wl, i, 0, NULL);
	if (ret)
	goto out;
	}

	out:
	return ret;
	}
	#endif /* CONFIG_PM */