rx.c 40.3 KB
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/*
 * Intel Wireless Multicomm 3200 WiFi driver
 *
 * Copyright (C) 2009 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Intel Corporation <ilw@linux.intel.com>
 * Samuel Ortiz <samuel.ortiz@intel.com>
 * Zhu Yi <yi.zhu@intel.com>
 *
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/wireless.h>
#include <linux/ieee80211.h>
#include <linux/if_arp.h>
#include <linux/list.h>
#include <net/iw_handler.h>

#include "iwm.h"
#include "debug.h"
#include "hal.h"
#include "umac.h"
#include "lmac.h"
#include "commands.h"
#include "rx.h"
#include "cfg80211.h"
#include "eeprom.h"

static int iwm_rx_check_udma_hdr(struct iwm_udma_in_hdr *hdr)
{
	if ((le32_to_cpu(hdr->cmd) == UMAC_PAD_TERMINAL) ||
	    (le32_to_cpu(hdr->size) == UMAC_PAD_TERMINAL))
		return -EINVAL;

	return 0;
}

static inline int iwm_rx_resp_size(struct iwm_udma_in_hdr *hdr)
{
	return ALIGN(le32_to_cpu(hdr->size) + sizeof(struct iwm_udma_in_hdr),
		     16);
}

/*
 * Notification handlers:
 *
 * For every possible notification we can receive from the
 * target, we have a handler.
 * When we get a target notification, and there is no one
 * waiting for it, it's just processed through the rx code
 * path:
 *
 * iwm_rx_handle()
 *  -> iwm_rx_handle_umac()
 *      -> iwm_rx_handle_wifi()
 *          -> iwm_rx_handle_resp()
 *              -> iwm_ntf_*()
 *
 *      OR
 *
 *      -> iwm_rx_handle_non_wifi()
 *
 * If there are processes waiting for this notification, then
 * iwm_rx_handle_wifi() just wakes those processes up and they
 * grab the pending notification.
 */
static int iwm_ntf_error(struct iwm_priv *iwm, u8 *buf,
			 unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_error *error;
	struct iwm_fw_error_hdr *fw_err;

	error = (struct iwm_umac_notif_error *)buf;
	fw_err = &error->err;


	IWM_ERR(iwm, "%cMAC FW ERROR:\n",
	 (le32_to_cpu(fw_err->category) == UMAC_SYS_ERR_CAT_LMAC) ? 'L' : 'U');
	IWM_ERR(iwm, "\tCategory:    %d\n", le32_to_cpu(fw_err->category));
	IWM_ERR(iwm, "\tStatus:      0x%x\n", le32_to_cpu(fw_err->status));
	IWM_ERR(iwm, "\tPC:          0x%x\n", le32_to_cpu(fw_err->pc));
	IWM_ERR(iwm, "\tblink1:      %d\n", le32_to_cpu(fw_err->blink1));
	IWM_ERR(iwm, "\tblink2:      %d\n", le32_to_cpu(fw_err->blink2));
	IWM_ERR(iwm, "\tilink1:      %d\n", le32_to_cpu(fw_err->ilink1));
	IWM_ERR(iwm, "\tilink2:      %d\n", le32_to_cpu(fw_err->ilink2));
	IWM_ERR(iwm, "\tData1:       0x%x\n", le32_to_cpu(fw_err->data1));
	IWM_ERR(iwm, "\tData2:       0x%x\n", le32_to_cpu(fw_err->data2));
	IWM_ERR(iwm, "\tLine number: %d\n", le32_to_cpu(fw_err->line_num));
	IWM_ERR(iwm, "\tUMAC status: 0x%x\n", le32_to_cpu(fw_err->umac_status));
	IWM_ERR(iwm, "\tLMAC status: 0x%x\n", le32_to_cpu(fw_err->lmac_status));
	IWM_ERR(iwm, "\tSDIO status: 0x%x\n", le32_to_cpu(fw_err->sdio_status));

	return 0;
}

static int iwm_ntf_umac_alive(struct iwm_priv *iwm, u8 *buf,
			      unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_alive *alive_resp =
			(struct iwm_umac_notif_alive *)(buf);
	u16 status = le16_to_cpu(alive_resp->status);

	if (status == UMAC_NTFY_ALIVE_STATUS_ERR) {
		IWM_ERR(iwm, "Receive error UMAC_ALIVE\n");
		return -EIO;
	}

	iwm_tx_credit_init_pools(iwm, alive_resp);

	return 0;
}

static int iwm_ntf_init_complete(struct iwm_priv *iwm, u8 *buf,
				 unsigned long buf_size,
				 struct iwm_wifi_cmd *cmd)
{
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	struct wiphy *wiphy = iwm_to_wiphy(iwm);
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	struct iwm_umac_notif_init_complete *init_complete =
			(struct iwm_umac_notif_init_complete *)(buf);
	u16 status = le16_to_cpu(init_complete->status);
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	bool blocked = (status == UMAC_NTFY_INIT_COMPLETE_STATUS_ERR);
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	if (blocked)
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		IWM_DBG_NTF(iwm, DBG, "Hardware rf kill is on (radio off)\n");
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	else
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		IWM_DBG_NTF(iwm, DBG, "Hardware rf kill is off (radio on)\n");
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	wiphy_rfkill_set_hw_state(wiphy, blocked);
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	return 0;
}

static int iwm_ntf_tx_credit_update(struct iwm_priv *iwm, u8 *buf,
				    unsigned long buf_size,
				    struct iwm_wifi_cmd *cmd)
{
	int pool_nr, total_freed_pages;
	unsigned long pool_map;
	int i, id;
	struct iwm_umac_notif_page_dealloc *dealloc =
			(struct iwm_umac_notif_page_dealloc *)buf;

	pool_nr = GET_VAL32(dealloc->changes, UMAC_DEALLOC_NTFY_CHANGES_CNT);
	pool_map = GET_VAL32(dealloc->changes, UMAC_DEALLOC_NTFY_CHANGES_MSK);

	IWM_DBG_TX(iwm, DBG, "UMAC dealloc notification: pool nr %d, "
		   "update map 0x%lx\n", pool_nr, pool_map);

	spin_lock(&iwm->tx_credit.lock);

	for (i = 0; i < pool_nr; i++) {
		id = GET_VAL32(dealloc->grp_info[i],
			       UMAC_DEALLOC_NTFY_GROUP_NUM);
		if (test_bit(id, &pool_map)) {
			total_freed_pages = GET_VAL32(dealloc->grp_info[i],
					      UMAC_DEALLOC_NTFY_PAGE_CNT);
			iwm_tx_credit_inc(iwm, id, total_freed_pages);
		}
	}

	spin_unlock(&iwm->tx_credit.lock);

	return 0;
}

static int iwm_ntf_umac_reset(struct iwm_priv *iwm, u8 *buf,
			      unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	IWM_DBG_NTF(iwm, DBG, "UMAC RESET done\n");

	return 0;
}

static int iwm_ntf_lmac_version(struct iwm_priv *iwm, u8 *buf,
				unsigned long buf_size,
				struct iwm_wifi_cmd *cmd)
{
	IWM_DBG_NTF(iwm, INFO, "LMAC Version: %x.%x\n", buf[9], buf[8]);

	return 0;
}

static int iwm_ntf_tx(struct iwm_priv *iwm, u8 *buf,
		      unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_lmac_tx_resp *tx_resp;
	struct iwm_umac_wifi_in_hdr *hdr;

	tx_resp = (struct iwm_lmac_tx_resp *)
		(buf + sizeof(struct iwm_umac_wifi_in_hdr));
	hdr = (struct iwm_umac_wifi_in_hdr *)buf;

	IWM_DBG_NTF(iwm, DBG, "REPLY_TX, buf size: %lu\n", buf_size);

	IWM_DBG_NTF(iwm, DBG, "Seqnum: %d\n",
		    le16_to_cpu(hdr->sw_hdr.cmd.seq_num));
	IWM_DBG_NTF(iwm, DBG, "\tFrame cnt: %d\n", tx_resp->frame_cnt);
	IWM_DBG_NTF(iwm, DBG, "\tRetry cnt: %d\n",
		    le16_to_cpu(tx_resp->retry_cnt));
	IWM_DBG_NTF(iwm, DBG, "\tSeq ctl: %d\n", le16_to_cpu(tx_resp->seq_ctl));
	IWM_DBG_NTF(iwm, DBG, "\tByte cnt: %d\n",
		    le16_to_cpu(tx_resp->byte_cnt));
	IWM_DBG_NTF(iwm, DBG, "\tStatus: 0x%x\n", le32_to_cpu(tx_resp->status));

	return 0;
}


static int iwm_ntf_calib_res(struct iwm_priv *iwm, u8 *buf,
			     unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	u8 opcode;
	u8 *calib_buf;
	struct iwm_lmac_calib_hdr *hdr = (struct iwm_lmac_calib_hdr *)
				(buf + sizeof(struct iwm_umac_wifi_in_hdr));

	opcode = hdr->opcode;

	BUG_ON(opcode >= CALIBRATION_CMD_NUM ||
	       opcode < PHY_CALIBRATE_OPCODES_NUM);

	IWM_DBG_NTF(iwm, DBG, "Store calibration result for opcode: %d\n",
		    opcode);

	buf_size -= sizeof(struct iwm_umac_wifi_in_hdr);
	calib_buf = iwm->calib_res[opcode].buf;

	if (!calib_buf || (iwm->calib_res[opcode].size < buf_size)) {
		kfree(calib_buf);
		calib_buf = kzalloc(buf_size, GFP_KERNEL);
		if (!calib_buf) {
			IWM_ERR(iwm, "Memory allocation failed: calib_res\n");
			return -ENOMEM;
		}
		iwm->calib_res[opcode].buf = calib_buf;
		iwm->calib_res[opcode].size = buf_size;
	}

	memcpy(calib_buf, hdr, buf_size);
	set_bit(opcode - PHY_CALIBRATE_OPCODES_NUM, &iwm->calib_done_map);

	return 0;
}

static int iwm_ntf_calib_complete(struct iwm_priv *iwm, u8 *buf,
				  unsigned long buf_size,
				  struct iwm_wifi_cmd *cmd)
{
	IWM_DBG_NTF(iwm, DBG, "Calibration completed\n");

	return 0;
}

static int iwm_ntf_calib_cfg(struct iwm_priv *iwm, u8 *buf,
			     unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_lmac_cal_cfg_resp *cal_resp;

	cal_resp = (struct iwm_lmac_cal_cfg_resp *)
			(buf + sizeof(struct iwm_umac_wifi_in_hdr));

	IWM_DBG_NTF(iwm, DBG, "Calibration CFG command status: %d\n",
		    le32_to_cpu(cal_resp->status));

	return 0;
}

static int iwm_ntf_wifi_status(struct iwm_priv *iwm, u8 *buf,
			       unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_wifi_status *status =
		(struct iwm_umac_notif_wifi_status *)buf;

	iwm->core_enabled |= le16_to_cpu(status->status);

	return 0;
}

static struct iwm_rx_ticket_node *
iwm_rx_ticket_node_alloc(struct iwm_priv *iwm, struct iwm_rx_ticket *ticket)
{
	struct iwm_rx_ticket_node *ticket_node;

	ticket_node = kzalloc(sizeof(struct iwm_rx_ticket_node), GFP_KERNEL);
	if (!ticket_node) {
		IWM_ERR(iwm, "Couldn't allocate ticket node\n");
		return ERR_PTR(-ENOMEM);
	}

	ticket_node->ticket = kzalloc(sizeof(struct iwm_rx_ticket), GFP_KERNEL);
	if (!ticket_node->ticket) {
		IWM_ERR(iwm, "Couldn't allocate RX ticket\n");
		kfree(ticket_node);
		return ERR_PTR(-ENOMEM);
	}

	memcpy(ticket_node->ticket, ticket, sizeof(struct iwm_rx_ticket));
	INIT_LIST_HEAD(&ticket_node->node);

	return ticket_node;
}

static void iwm_rx_ticket_node_free(struct iwm_rx_ticket_node *ticket_node)
{
	kfree(ticket_node->ticket);
	kfree(ticket_node);
}

static struct iwm_rx_packet *iwm_rx_packet_get(struct iwm_priv *iwm, u16 id)
{
	u8 id_hash = IWM_RX_ID_GET_HASH(id);
	struct list_head *packet_list;
	struct iwm_rx_packet *packet, *next;

	packet_list = &iwm->rx_packets[id_hash];

	list_for_each_entry_safe(packet, next, packet_list, node)
		if (packet->id == id)
			return packet;

	return NULL;
}

static struct iwm_rx_packet *iwm_rx_packet_alloc(struct iwm_priv *iwm, u8 *buf,
						 u32 size, u16 id)
{
	struct iwm_rx_packet *packet;

	packet = kzalloc(sizeof(struct iwm_rx_packet), GFP_KERNEL);
	if (!packet) {
		IWM_ERR(iwm, "Couldn't allocate packet\n");
		return ERR_PTR(-ENOMEM);
	}

	packet->skb = dev_alloc_skb(size);
	if (!packet->skb) {
		IWM_ERR(iwm, "Couldn't allocate packet SKB\n");
		kfree(packet);
		return ERR_PTR(-ENOMEM);
	}

	packet->pkt_size = size;

	skb_put(packet->skb, size);
	memcpy(packet->skb->data, buf, size);
	INIT_LIST_HEAD(&packet->node);
	packet->id = id;

	return packet;
}

void iwm_rx_free(struct iwm_priv *iwm)
{
	struct iwm_rx_ticket_node *ticket, *nt;
	struct iwm_rx_packet *packet, *np;
	int i;

	list_for_each_entry_safe(ticket, nt, &iwm->rx_tickets, node) {
		list_del(&ticket->node);
		iwm_rx_ticket_node_free(ticket);
	}

	for (i = 0; i < IWM_RX_ID_HASH; i++) {
		list_for_each_entry_safe(packet, np, &iwm->rx_packets[i],
					 node) {
			list_del(&packet->node);
			kfree_skb(packet->skb);
			kfree(packet);
		}
	}
}

static int iwm_ntf_rx_ticket(struct iwm_priv *iwm, u8 *buf,
			     unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_rx_ticket *ntf_rx_ticket =
		(struct iwm_umac_notif_rx_ticket *)buf;
	struct iwm_rx_ticket *ticket =
		(struct iwm_rx_ticket *)ntf_rx_ticket->tickets;
	int i, schedule_rx = 0;

	for (i = 0; i < ntf_rx_ticket->num_tickets; i++) {
		struct iwm_rx_ticket_node *ticket_node;

		switch (le16_to_cpu(ticket->action)) {
		case IWM_RX_TICKET_RELEASE:
		case IWM_RX_TICKET_DROP:
			/* We can push the packet to the stack */
			ticket_node = iwm_rx_ticket_node_alloc(iwm, ticket);
			if (IS_ERR(ticket_node))
				return PTR_ERR(ticket_node);

			IWM_DBG_NTF(iwm, DBG, "TICKET RELEASE(%d)\n",
				    ticket->id);
			list_add_tail(&ticket_node->node, &iwm->rx_tickets);

			/*
			 * We received an Rx ticket, most likely there's
			 * a packet pending for it, it's not worth going
			 * through the packet hash list to double check.
			 * Let's just fire the rx worker..
			 */
			schedule_rx = 1;

			break;

		default:
			IWM_ERR(iwm, "Invalid RX ticket action: 0x%x\n",
				ticket->action);
		}

		ticket++;
	}

	if (schedule_rx)
		queue_work(iwm->rx_wq, &iwm->rx_worker);

	return 0;
}

static int iwm_ntf_rx_packet(struct iwm_priv *iwm, u8 *buf,
			     unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_wifi_in_hdr *wifi_hdr;
	struct iwm_rx_packet *packet;
	u16 id, buf_offset;
	u32 packet_size;

	IWM_DBG_NTF(iwm, DBG, "\n");

	wifi_hdr = (struct iwm_umac_wifi_in_hdr *)buf;
	id = le16_to_cpu(wifi_hdr->sw_hdr.cmd.seq_num);
	buf_offset = sizeof(struct iwm_umac_wifi_in_hdr);
	packet_size = buf_size - sizeof(struct iwm_umac_wifi_in_hdr);

	IWM_DBG_NTF(iwm, DBG, "CMD:0x%x, seqnum: %d, packet size: %d\n",
		    wifi_hdr->sw_hdr.cmd.cmd, id, packet_size);
	IWM_DBG_RX(iwm, DBG, "Packet id: %d\n", id);
	IWM_HEXDUMP(iwm, DBG, RX, "PACKET: ", buf + buf_offset, packet_size);

	packet = iwm_rx_packet_alloc(iwm, buf + buf_offset, packet_size, id);
	if (IS_ERR(packet))
		return PTR_ERR(packet);

	list_add_tail(&packet->node, &iwm->rx_packets[IWM_RX_ID_GET_HASH(id)]);

	/* We might (unlikely) have received the packet _after_ the ticket */
	queue_work(iwm->rx_wq, &iwm->rx_worker);

	return 0;
}

/* MLME handlers */
static int iwm_mlme_assoc_start(struct iwm_priv *iwm, u8 *buf,
				unsigned long buf_size,
				struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_assoc_start *start;

	start = (struct iwm_umac_notif_assoc_start *)buf;

	set_bit(IWM_STATUS_ASSOCIATING, &iwm->status);

	IWM_DBG_MLME(iwm, INFO, "Association with %pM Started, reason: %d\n",
		     start->bssid, le32_to_cpu(start->roam_reason));

	wake_up_interruptible(&iwm->mlme_queue);

	return 0;
}

static int iwm_mlme_assoc_complete(struct iwm_priv *iwm, u8 *buf,
				   unsigned long buf_size,
				   struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_assoc_complete *complete =
		(struct iwm_umac_notif_assoc_complete *)buf;
	union iwreq_data wrqu;

	IWM_DBG_MLME(iwm, INFO, "Association with %pM completed, status: %d\n",
		     complete->bssid, complete->status);

	memset(&wrqu, 0, sizeof(wrqu));

	clear_bit(IWM_STATUS_ASSOCIATING, &iwm->status);

	switch (le32_to_cpu(complete->status)) {
	case UMAC_ASSOC_COMPLETE_SUCCESS:
		set_bit(IWM_STATUS_ASSOCIATED, &iwm->status);
		memcpy(iwm->bssid, complete->bssid, ETH_ALEN);
		iwm->channel = complete->channel;

		iwm_link_on(iwm);

		memcpy(wrqu.ap_addr.sa_data, complete->bssid, ETH_ALEN);
		break;
	case UMAC_ASSOC_COMPLETE_FAILURE:
		clear_bit(IWM_STATUS_ASSOCIATED, &iwm->status);
		memset(iwm->bssid, 0, ETH_ALEN);
		iwm->channel = 0;

		iwm_link_off(iwm);
	default:
		break;
	}

	if (iwm->conf.mode == UMAC_MODE_IBSS) {
		cfg80211_ibss_joined(iwm_to_ndev(iwm), iwm->bssid, GFP_KERNEL);
		return 0;
	}

	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	wireless_send_event(iwm_to_ndev(iwm), SIOCGIWAP, &wrqu, NULL);

	return 0;
}

static int iwm_mlme_profile_invalidate(struct iwm_priv *iwm, u8 *buf,
				       unsigned long buf_size,
				       struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_profile_invalidate *invalid;

	invalid = (struct iwm_umac_notif_profile_invalidate *)buf;

	IWM_DBG_MLME(iwm, INFO, "Profile Invalidated. Reason: %d\n",
		     le32_to_cpu(invalid->reason));

	clear_bit(IWM_STATUS_ASSOCIATING, &iwm->status);
	clear_bit(IWM_STATUS_ASSOCIATED, &iwm->status);

	iwm->umac_profile_active = 0;
	memset(iwm->bssid, 0, ETH_ALEN);
	iwm->channel = 0;

	iwm_link_off(iwm);

	wake_up_interruptible(&iwm->mlme_queue);

	return 0;
}

static int iwm_mlme_scan_complete(struct iwm_priv *iwm, u8 *buf,
				  unsigned long buf_size,
				  struct iwm_wifi_cmd *cmd)
{
	int ret;
	struct iwm_umac_notif_scan_complete *scan_complete =
		(struct iwm_umac_notif_scan_complete *)buf;
	u32 result = le32_to_cpu(scan_complete->result);

	IWM_DBG_MLME(iwm, INFO, "type:0x%x result:0x%x seq:%d\n",
		     le32_to_cpu(scan_complete->type),
		     le32_to_cpu(scan_complete->result),
		     scan_complete->seq_num);

	if (!test_and_clear_bit(IWM_STATUS_SCANNING, &iwm->status)) {
		IWM_ERR(iwm, "Scan complete while device not scanning\n");
		return -EIO;
	}
	if (!iwm->scan_request)
		return 0;

	ret = iwm_cfg80211_inform_bss(iwm);

	cfg80211_scan_done(iwm->scan_request,
			   (result & UMAC_SCAN_RESULT_ABORTED) ? 1 : !!ret);
	iwm->scan_request = NULL;

	return ret;
}

static int iwm_mlme_update_sta_table(struct iwm_priv *iwm, u8 *buf,
				     unsigned long buf_size,
				     struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_sta_info *umac_sta =
			(struct iwm_umac_notif_sta_info *)buf;
	struct iwm_sta_info *sta;
	int i;

	switch (le32_to_cpu(umac_sta->opcode)) {
	case UMAC_OPCODE_ADD_MODIFY:
		sta = &iwm->sta_table[GET_VAL8(umac_sta->sta_id, LMAC_STA_ID)];

		IWM_DBG_MLME(iwm, INFO, "%s STA: ID = %d, Color = %d, "
			     "addr = %pM, qos = %d\n",
			     sta->valid ? "Modify" : "Add",
			     GET_VAL8(umac_sta->sta_id, LMAC_STA_ID),
			     GET_VAL8(umac_sta->sta_id, LMAC_STA_COLOR),
			     umac_sta->mac_addr,
			     umac_sta->flags & UMAC_STA_FLAG_QOS);

		sta->valid = 1;
		sta->qos = umac_sta->flags & UMAC_STA_FLAG_QOS;
		sta->color = GET_VAL8(umac_sta->sta_id, LMAC_STA_COLOR);
		memcpy(sta->addr, umac_sta->mac_addr, ETH_ALEN);
		break;
	case UMAC_OPCODE_REMOVE:
		IWM_DBG_MLME(iwm, INFO, "Remove STA: ID = %d, Color = %d, "
			     "addr = %pM\n",
			     GET_VAL8(umac_sta->sta_id, LMAC_STA_ID),
			     GET_VAL8(umac_sta->sta_id, LMAC_STA_COLOR),
			     umac_sta->mac_addr);

		sta = &iwm->sta_table[GET_VAL8(umac_sta->sta_id, LMAC_STA_ID)];

		if (!memcmp(sta->addr, umac_sta->mac_addr, ETH_ALEN))
			sta->valid = 0;

		break;
	case UMAC_OPCODE_CLEAR_ALL:
		for (i = 0; i < IWM_STA_TABLE_NUM; i++)
			iwm->sta_table[i].valid = 0;

		break;
	default:
		break;
	}

	return 0;
}

static int iwm_mlme_update_bss_table(struct iwm_priv *iwm, u8 *buf,
				     unsigned long buf_size,
				     struct iwm_wifi_cmd *cmd)
{
	struct wiphy *wiphy = iwm_to_wiphy(iwm);
	struct ieee80211_mgmt *mgmt;
	struct iwm_umac_notif_bss_info *umac_bss =
			(struct iwm_umac_notif_bss_info *)buf;
	struct ieee80211_channel *channel;
	struct ieee80211_supported_band *band;
	struct iwm_bss_info *bss, *next;
	s32 signal;
	int freq;
	u16 frame_len = le16_to_cpu(umac_bss->frame_len);
	size_t bss_len = sizeof(struct iwm_umac_notif_bss_info) + frame_len;

	mgmt = (struct ieee80211_mgmt *)(umac_bss->frame_buf);

	IWM_DBG_MLME(iwm, DBG, "New BSS info entry: %pM\n", mgmt->bssid);
	IWM_DBG_MLME(iwm, DBG, "\tType: 0x%x\n", le32_to_cpu(umac_bss->type));
	IWM_DBG_MLME(iwm, DBG, "\tTimestamp: %d\n",
		     le32_to_cpu(umac_bss->timestamp));
	IWM_DBG_MLME(iwm, DBG, "\tTable Index: %d\n",
		     le16_to_cpu(umac_bss->table_idx));
	IWM_DBG_MLME(iwm, DBG, "\tBand: %d\n", umac_bss->band);
	IWM_DBG_MLME(iwm, DBG, "\tChannel: %d\n", umac_bss->channel);
	IWM_DBG_MLME(iwm, DBG, "\tRSSI: %d\n", umac_bss->rssi);
	IWM_DBG_MLME(iwm, DBG, "\tFrame Length: %d\n", frame_len);

	list_for_each_entry_safe(bss, next, &iwm->bss_list, node)
		if (bss->bss->table_idx == umac_bss->table_idx)
			break;

	if (&bss->node != &iwm->bss_list) {
		/* Remove the old BSS entry, we will add it back later. */
		list_del(&bss->node);
		kfree(bss->bss);
	} else {
		/* New BSS entry */

		bss = kzalloc(sizeof(struct iwm_bss_info), GFP_KERNEL);
		if (!bss) {
			IWM_ERR(iwm, "Couldn't allocate bss_info\n");
			return -ENOMEM;
		}
	}

	bss->bss = kzalloc(bss_len, GFP_KERNEL);
	if (!bss) {
		kfree(bss);
		IWM_ERR(iwm, "Couldn't allocate bss\n");
		return -ENOMEM;
	}

	INIT_LIST_HEAD(&bss->node);
	memcpy(bss->bss, umac_bss, bss_len);

	if (umac_bss->band == UMAC_BAND_2GHZ)
		band = wiphy->bands[IEEE80211_BAND_2GHZ];
	else if (umac_bss->band == UMAC_BAND_5GHZ)
		band = wiphy->bands[IEEE80211_BAND_5GHZ];
	else {
		IWM_ERR(iwm, "Invalid band: %d\n", umac_bss->band);
		goto err;
	}

	freq = ieee80211_channel_to_frequency(umac_bss->channel);
	channel = ieee80211_get_channel(wiphy, freq);
	signal = umac_bss->rssi * 100;

	bss->cfg_bss = cfg80211_inform_bss_frame(wiphy, channel,
						 mgmt, frame_len,
						 signal, GFP_KERNEL);
	if (!bss->cfg_bss)
		goto err;

	list_add_tail(&bss->node, &iwm->bss_list);

	return 0;
 err:
	kfree(bss->bss);
	kfree(bss);

	return -EINVAL;
}

static int iwm_mlme_remove_bss(struct iwm_priv *iwm, u8 *buf,
			       unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_bss_removed *bss_rm =
		(struct iwm_umac_notif_bss_removed *)buf;
	struct iwm_bss_info *bss, *next;
	u16 table_idx;
	int i;

	for (i = 0; i < le32_to_cpu(bss_rm->count); i++) {
		table_idx = (le16_to_cpu(bss_rm->entries[i])
			     & IWM_BSS_REMOVE_INDEX_MSK);
		list_for_each_entry_safe(bss, next, &iwm->bss_list, node)
			if (bss->bss->table_idx == cpu_to_le16(table_idx)) {
				struct ieee80211_mgmt *mgmt;

				mgmt = (struct ieee80211_mgmt *)
					(bss->bss->frame_buf);
				IWM_DBG_MLME(iwm, ERR,
					     "BSS removed: %pM\n",
					     mgmt->bssid);
				list_del(&bss->node);
				kfree(bss->bss);
				kfree(bss);
			}
	}

	return 0;
}

static int iwm_mlme_mgt_frame(struct iwm_priv *iwm, u8 *buf,
			      unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_mgt_frame *mgt_frame =
	(struct iwm_umac_notif_mgt_frame *)buf;
	struct ieee80211_mgmt *mgt = (struct ieee80211_mgmt *)mgt_frame->frame;
	u8 *ie;
	unsigned int event;
	union iwreq_data wrqu;

	IWM_HEXDUMP(iwm, DBG, MLME, "MGT: ", mgt_frame->frame,
		    le16_to_cpu(mgt_frame->len));

	if (ieee80211_is_assoc_req(mgt->frame_control)) {
		ie = mgt->u.assoc_req.variable;;
		event = IWEVASSOCREQIE;
	} else if (ieee80211_is_reassoc_req(mgt->frame_control)) {
		ie = mgt->u.reassoc_req.variable;;
		event = IWEVASSOCREQIE;
	} else if (ieee80211_is_assoc_resp(mgt->frame_control)) {
		ie = mgt->u.assoc_resp.variable;;
		event = IWEVASSOCRESPIE;
	} else if (ieee80211_is_reassoc_resp(mgt->frame_control)) {
		ie = mgt->u.reassoc_resp.variable;;
		event = IWEVASSOCRESPIE;
	} else {
		IWM_ERR(iwm, "Unsupported management frame");
		return 0;
	}

	wrqu.data.length = le16_to_cpu(mgt_frame->len) - (ie - (u8 *)mgt);

	IWM_HEXDUMP(iwm, DBG, MLME, "EVT: ", ie, wrqu.data.length);
	wireless_send_event(iwm_to_ndev(iwm), event, &wrqu, ie);

	return 0;
}

static int iwm_ntf_mlme(struct iwm_priv *iwm, u8 *buf,
			unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_wifi_if *notif =
		(struct iwm_umac_notif_wifi_if *)buf;

	switch (notif->status) {
	case WIFI_IF_NTFY_ASSOC_START:
		return iwm_mlme_assoc_start(iwm, buf, buf_size, cmd);
	case WIFI_IF_NTFY_ASSOC_COMPLETE:
		return iwm_mlme_assoc_complete(iwm, buf, buf_size, cmd);
	case WIFI_IF_NTFY_PROFILE_INVALIDATE_COMPLETE:
		return iwm_mlme_profile_invalidate(iwm, buf, buf_size, cmd);
	case WIFI_IF_NTFY_CONNECTION_TERMINATED:
		IWM_DBG_MLME(iwm, DBG, "Connection terminated\n");
		break;
	case WIFI_IF_NTFY_SCAN_COMPLETE:
		return iwm_mlme_scan_complete(iwm, buf, buf_size, cmd);
	case WIFI_IF_NTFY_STA_TABLE_CHANGE:
		return iwm_mlme_update_sta_table(iwm, buf, buf_size, cmd);
	case WIFI_IF_NTFY_EXTENDED_IE_REQUIRED:
		IWM_DBG_MLME(iwm, DBG, "Extended IE required\n");
		break;
	case WIFI_IF_NTFY_BSS_TRK_TABLE_CHANGED:
		return iwm_mlme_update_bss_table(iwm, buf, buf_size, cmd);
	case WIFI_IF_NTFY_BSS_TRK_ENTRIES_REMOVED:
		return iwm_mlme_remove_bss(iwm, buf, buf_size, cmd);
		break;
	case WIFI_IF_NTFY_MGMT_FRAME:
		return iwm_mlme_mgt_frame(iwm, buf, buf_size, cmd);
	case WIFI_DBG_IF_NTFY_SCAN_SUPER_JOB_START:
	case WIFI_DBG_IF_NTFY_SCAN_SUPER_JOB_COMPLETE:
	case WIFI_DBG_IF_NTFY_SCAN_CHANNEL_START:
	case WIFI_DBG_IF_NTFY_SCAN_CHANNEL_RESULT:
	case WIFI_DBG_IF_NTFY_SCAN_MINI_JOB_START:
	case WIFI_DBG_IF_NTFY_SCAN_MINI_JOB_COMPLETE:
	case WIFI_DBG_IF_NTFY_CNCT_ATC_START:
	case WIFI_DBG_IF_NTFY_COEX_NOTIFICATION:
	case WIFI_DBG_IF_NTFY_COEX_HANDLE_ENVELOP:
	case WIFI_DBG_IF_NTFY_COEX_HANDLE_RELEASE_ENVELOP:
		IWM_DBG_MLME(iwm, DBG, "MLME debug notification: 0x%x\n",
			     notif->status);
		break;
	default:
		IWM_ERR(iwm, "Unhandled notification: 0x%x\n", notif->status);
		break;
	}

	return 0;
}

#define IWM_STATS_UPDATE_INTERVAL		(2 * HZ)

static int iwm_ntf_statistics(struct iwm_priv *iwm, u8 *buf,
			      unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_notif_stats *stats = (struct iwm_umac_notif_stats *)buf;
	struct iw_statistics *wstats = &iwm->wstats;
	u16 max_rate = 0;
	int i;

	IWM_DBG_MLME(iwm, DBG, "Statistics notification received\n");

	if (test_bit(IWM_STATUS_ASSOCIATED, &iwm->status)) {
		for (i = 0; i < UMAC_NTF_RATE_SAMPLE_NR; i++) {
			max_rate = max_t(u16, max_rate,
					 max(le16_to_cpu(stats->tx_rate[i]),
					     le16_to_cpu(stats->rx_rate[i])));
		}
		/* UMAC passes rate info multiplies by 2 */
		iwm->rate = max_rate >> 1;
	}
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	iwm->txpower = le32_to_cpu(stats->tx_power);
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	wstats->status = 0;

	wstats->discard.nwid = le32_to_cpu(stats->rx_drop_other_bssid);
	wstats->discard.code = le32_to_cpu(stats->rx_drop_decode);
	wstats->discard.fragment = le32_to_cpu(stats->rx_drop_reassembly);
	wstats->discard.retries = le32_to_cpu(stats->tx_drop_max_retry);

	wstats->miss.beacon = le32_to_cpu(stats->missed_beacons);

	/* according to cfg80211 */
	if (stats->rssi_dbm < -110)
		wstats->qual.qual = 0;
	else if (stats->rssi_dbm > -40)
		wstats->qual.qual = 70;
	else
		wstats->qual.qual = stats->rssi_dbm + 110;

	wstats->qual.level = stats->rssi_dbm;
	wstats->qual.noise = stats->noise_dbm;
	wstats->qual.updated = IW_QUAL_ALL_UPDATED | IW_QUAL_DBM;

	schedule_delayed_work(&iwm->stats_request, IWM_STATS_UPDATE_INTERVAL);

	mod_timer(&iwm->watchdog, round_jiffies(jiffies + IWM_WATCHDOG_PERIOD));

	return 0;
}

static int iwm_ntf_eeprom_proxy(struct iwm_priv *iwm, u8 *buf,
				unsigned long buf_size,
				struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_cmd_eeprom_proxy *eeprom_proxy =
		(struct iwm_umac_cmd_eeprom_proxy *)
		(buf + sizeof(struct iwm_umac_wifi_in_hdr));
	struct iwm_umac_cmd_eeprom_proxy_hdr *hdr = &eeprom_proxy->hdr;
	u32 hdr_offset = le32_to_cpu(hdr->offset);
	u32 hdr_len = le32_to_cpu(hdr->len);
	u32 hdr_type = le32_to_cpu(hdr->type);

	IWM_DBG_NTF(iwm, DBG, "type: 0x%x, len: %d, offset: 0x%x\n",
		    hdr_type, hdr_len, hdr_offset);

	if ((hdr_offset + hdr_len) > IWM_EEPROM_LEN)
		return -EINVAL;

#ifdef CONFIG_IWM_B0_HW_SUPPORT
	if (hdr_offset == IWM_EEPROM_SKU_CAP_OFF) {
		if (eeprom_proxy->buf[0] == 0xff)
			iwm->conf.hw_b0 = 1;
	}
#endif

	switch (hdr_type) {
	case IWM_UMAC_CMD_EEPROM_TYPE_READ:
		memcpy(iwm->eeprom + hdr_offset, eeprom_proxy->buf, hdr_len);
		break;
	case IWM_UMAC_CMD_EEPROM_TYPE_WRITE:
	default:
		return -ENOTSUPP;
	}

	return 0;
}

static int iwm_ntf_channel_info_list(struct iwm_priv *iwm, u8 *buf,
				     unsigned long buf_size,
				     struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_cmd_get_channel_list *ch_list =
			(struct iwm_umac_cmd_get_channel_list *)
			(buf + sizeof(struct iwm_umac_wifi_in_hdr));
	struct wiphy *wiphy = iwm_to_wiphy(iwm);
	struct ieee80211_supported_band *band;
	int i;

	band = wiphy->bands[IEEE80211_BAND_2GHZ];

	for (i = 0; i < band->n_channels; i++) {
		unsigned long ch_mask_0 =
			le32_to_cpu(ch_list->ch[0].channels_mask);
		unsigned long ch_mask_2 =
			le32_to_cpu(ch_list->ch[2].channels_mask);

		if (!test_bit(i, &ch_mask_0))
			band->channels[i].flags |= IEEE80211_CHAN_DISABLED;

		if (!test_bit(i, &ch_mask_2))
			band->channels[i].flags |= IEEE80211_CHAN_NO_IBSS;
	}

	band = wiphy->bands[IEEE80211_BAND_5GHZ];

	for (i = 0; i < min(band->n_channels, 32); i++) {
		unsigned long ch_mask_1 =
			le32_to_cpu(ch_list->ch[1].channels_mask);
		unsigned long ch_mask_3 =
			le32_to_cpu(ch_list->ch[3].channels_mask);

		if (!test_bit(i, &ch_mask_1))
			band->channels[i].flags |= IEEE80211_CHAN_DISABLED;

		if (!test_bit(i, &ch_mask_3))
			band->channels[i].flags |= IEEE80211_CHAN_NO_IBSS;
	}

	return 0;
}

static int iwm_ntf_wifi_if_wrapper(struct iwm_priv *iwm, u8 *buf,
				   unsigned long buf_size,
				   struct iwm_wifi_cmd *cmd)
{
	struct iwm_umac_wifi_if *hdr =
			(struct iwm_umac_wifi_if *)cmd->buf.payload;

	IWM_DBG_NTF(iwm, DBG, "WIFI_IF_WRAPPER cmd is delivered to UMAC: "
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		    "oid is 0x%x\n", hdr->oid);

	if (hdr->oid <= WIFI_IF_NTFY_MAX) {
		set_bit(hdr->oid, &iwm->wifi_ntfy[0]);
		wake_up_interruptible(&iwm->wifi_ntfy_queue);
	} else
		return -EINVAL;
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	switch (hdr->oid) {
	case UMAC_WIFI_IF_CMD_SET_PROFILE:
		iwm->umac_profile_active = 1;
		break;
	default:
		break;
	}

	return 0;
}

static int iwm_ntf_card_state(struct iwm_priv *iwm, u8 *buf,
			      unsigned long buf_size, struct iwm_wifi_cmd *cmd)
{
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	struct wiphy *wiphy = iwm_to_wiphy(iwm);
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	struct iwm_lmac_card_state *state = (struct iwm_lmac_card_state *)
				(buf + sizeof(struct iwm_umac_wifi_in_hdr));
	u32 flags = le32_to_cpu(state->flags);

	IWM_INFO(iwm, "HW RF Kill %s, CT Kill %s\n",
		 flags & IWM_CARD_STATE_HW_DISABLED ? "ON" : "OFF",
		 flags & IWM_CARD_STATE_CTKILL_DISABLED ? "ON" : "OFF");

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	wiphy_rfkill_set_hw_state(wiphy, flags & IWM_CARD_STATE_HW_DISABLED);
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	return 0;
}

static int iwm_rx_handle_wifi(struct iwm_priv *iwm, u8 *buf,
			      unsigned long buf_size)
{
	struct iwm_umac_wifi_in_hdr *wifi_hdr;
	struct iwm_wifi_cmd *cmd;
	u8 source, cmd_id;
	u16 seq_num;
	u32 count;
	u8 resp;

	wifi_hdr = (struct iwm_umac_wifi_in_hdr *)buf;
	cmd_id = wifi_hdr->sw_hdr.cmd.cmd;

	source = GET_VAL32(wifi_hdr->hw_hdr.cmd, UMAC_HDI_IN_CMD_SOURCE);
	if (source >= IWM_SRC_NUM) {
		IWM_CRIT(iwm, "invalid source %d\n", source);
		return -EINVAL;
	}

	count = (GET_VAL32(wifi_hdr->sw_hdr.meta_data, UMAC_FW_CMD_BYTE_COUNT));
	count += sizeof(struct iwm_umac_wifi_in_hdr) -
		 sizeof(struct iwm_dev_cmd_hdr);
	if (count > buf_size) {
		IWM_CRIT(iwm, "count %d, buf size:%ld\n", count, buf_size);
		return -EINVAL;
	}

	resp = GET_VAL32(wifi_hdr->sw_hdr.meta_data, UMAC_FW_CMD_STATUS);

	seq_num = le16_to_cpu(wifi_hdr->sw_hdr.cmd.seq_num);

	IWM_DBG_RX(iwm, DBG, "CMD:0x%x, source: 0x%x, seqnum: %d\n",
		   cmd_id, source, seq_num);

	/*
	 * If this is a response to a previously sent command, there must
	 * be a pending command for this sequence number.
	 */
	cmd = iwm_get_pending_wifi_cmd(iwm, seq_num);

	/* Notify the caller only for sync commands. */
	switch (source) {
	case UMAC_HDI_IN_SOURCE_FHRX:
		if (iwm->lmac_handlers[cmd_id] &&
		    test_bit(cmd_id, &iwm->lmac_handler_map[0]))
			return iwm_notif_send(iwm, cmd, cmd_id, source,
					      buf, count);
		break;
	case UMAC_HDI_IN_SOURCE_FW:
		if (iwm->umac_handlers[cmd_id] &&
		    test_bit(cmd_id, &iwm->umac_handler_map[0]))
			return iwm_notif_send(iwm, cmd, cmd_id, source,
					      buf, count);
		break;
	case UMAC_HDI_IN_SOURCE_UDMA:
		break;
	}

	return iwm_rx_handle_resp(iwm, buf, count, cmd);
}

int iwm_rx_handle_resp(struct iwm_priv *iwm, u8 *buf, unsigned long buf_size,
		       struct iwm_wifi_cmd *cmd)
{
	u8 source, cmd_id;
	struct iwm_umac_wifi_in_hdr *wifi_hdr;
	int ret = 0;

	wifi_hdr = (struct iwm_umac_wifi_in_hdr *)buf;
	cmd_id = wifi_hdr->sw_hdr.cmd.cmd;

	source = GET_VAL32(wifi_hdr->hw_hdr.cmd, UMAC_HDI_IN_CMD_SOURCE);

	IWM_DBG_RX(iwm, DBG, "CMD:0x%x, source: 0x%x\n", cmd_id, source);

	switch (source) {
	case UMAC_HDI_IN_SOURCE_FHRX:
		if (iwm->lmac_handlers[cmd_id])
			ret = iwm->lmac_handlers[cmd_id]
					(iwm, buf, buf_size, cmd);
		break;
	case UMAC_HDI_IN_SOURCE_FW:
		if (iwm->umac_handlers[cmd_id])
			ret = iwm->umac_handlers[cmd_id]
					(iwm, buf, buf_size, cmd);
		break;
	case UMAC_HDI_IN_SOURCE_UDMA:
		ret = -EINVAL;
		break;
	}

	kfree(cmd);

	return ret;
}

static int iwm_rx_handle_nonwifi(struct iwm_priv *iwm, u8 *buf,
				 unsigned long buf_size)
{
	u8 seq_num;
	struct iwm_udma_in_hdr *hdr = (struct iwm_udma_in_hdr *)buf;
	struct iwm_nonwifi_cmd *cmd, *next;

	seq_num = GET_VAL32(hdr->cmd, UDMA_HDI_IN_CMD_NON_WIFI_HW_SEQ_NUM);

	/*
	 * We received a non wifi answer.
	 * Let's check if there's a pending command for it, and if so
	 * replace the command payload with the buffer, and then wake the
	 * callers up.
	 * That means we only support synchronised non wifi command response
	 * schemes.
	 */
	list_for_each_entry_safe(cmd, next, &iwm->nonwifi_pending_cmd, pending)
		if (cmd->seq_num == seq_num) {
			cmd->resp_received = 1;
			cmd->buf.len = buf_size;
			memcpy(cmd->buf.hdr, buf, buf_size);
			wake_up_interruptible(&iwm->nonwifi_queue);
		}

	return 0;
}

static int iwm_rx_handle_umac(struct iwm_priv *iwm, u8 *buf,
			      unsigned long buf_size)
{
	int ret = 0;
	u8 op_code;
	unsigned long buf_offset = 0;
	struct iwm_udma_in_hdr *hdr;

	/*
	 * To allow for a more efficient bus usage, UMAC
	 * messages are encapsulated into UDMA ones. This
	 * way we can have several UMAC messages in one bus
	 * transfer.
	 * A UDMA frame size is always aligned on 16 bytes,
	 * and a UDMA frame must not start with a UMAC_PAD_TERMINAL
	 * word. This is how we parse a bus frame into several
	 * UDMA ones.
	 */
	while (buf_offset < buf_size) {

		hdr = (struct iwm_udma_in_hdr *)(buf + buf_offset);

		if (iwm_rx_check_udma_hdr(hdr) < 0) {
			IWM_DBG_RX(iwm, DBG, "End of frame\n");
			break;
		}

		op_code = GET_VAL32(hdr->cmd, UMAC_HDI_IN_CMD_OPCODE);

		IWM_DBG_RX(iwm, DBG, "Op code: 0x%x\n", op_code);

		if (op_code == UMAC_HDI_IN_OPCODE_WIFI) {
			ret |= iwm_rx_handle_wifi(iwm, buf + buf_offset,
						  buf_size - buf_offset);
		} else if (op_code < UMAC_HDI_IN_OPCODE_NONWIFI_MAX) {
			if (GET_VAL32(hdr->cmd,
				      UDMA_HDI_IN_CMD_NON_WIFI_HW_SIG) !=
			    UDMA_HDI_IN_CMD_NON_WIFI_HW_SIG) {
				IWM_ERR(iwm, "Incorrect hw signature\n");
				return -EINVAL;
			}
			ret |= iwm_rx_handle_nonwifi(iwm, buf + buf_offset,
						     buf_size - buf_offset);
		} else {
			IWM_ERR(iwm, "Invalid RX opcode: 0x%x\n", op_code);
			ret |= -EINVAL;
		}

		buf_offset += iwm_rx_resp_size(hdr);
	}

	return ret;
}

int iwm_rx_handle(struct iwm_priv *iwm, u8 *buf, unsigned long buf_size)
{
	struct iwm_udma_in_hdr *hdr;

	hdr = (struct iwm_udma_in_hdr *)buf;

	switch (le32_to_cpu(hdr->cmd)) {
	case UMAC_REBOOT_BARKER:
		return iwm_notif_send(iwm, NULL, IWM_BARKER_REBOOT_NOTIFICATION,
				      IWM_SRC_UDMA, buf, buf_size);
	case UMAC_ACK_BARKER:
		return iwm_notif_send(iwm, NULL, IWM_ACK_BARKER_NOTIFICATION,
				      IWM_SRC_UDMA, NULL, 0);
	default:
		IWM_DBG_RX(iwm, DBG, "Received cmd: 0x%x\n", hdr->cmd);
		return iwm_rx_handle_umac(iwm, buf, buf_size);
	}

	return 0;
}

static const iwm_handler iwm_umac_handlers[] =
{
	[UMAC_NOTIFY_OPCODE_ERROR]		= iwm_ntf_error,
	[UMAC_NOTIFY_OPCODE_ALIVE]		= iwm_ntf_umac_alive,
	[UMAC_NOTIFY_OPCODE_INIT_COMPLETE]	= iwm_ntf_init_complete,
	[UMAC_NOTIFY_OPCODE_WIFI_CORE_STATUS]	= iwm_ntf_wifi_status,
	[UMAC_NOTIFY_OPCODE_WIFI_IF_WRAPPER]	= iwm_ntf_mlme,
	[UMAC_NOTIFY_OPCODE_PAGE_DEALLOC]	= iwm_ntf_tx_credit_update,
	[UMAC_NOTIFY_OPCODE_RX_TICKET]		= iwm_ntf_rx_ticket,
	[UMAC_CMD_OPCODE_RESET]			= iwm_ntf_umac_reset,
	[UMAC_NOTIFY_OPCODE_STATS]		= iwm_ntf_statistics,
	[UMAC_CMD_OPCODE_EEPROM_PROXY]		= iwm_ntf_eeprom_proxy,
	[UMAC_CMD_OPCODE_GET_CHAN_INFO_LIST]	= iwm_ntf_channel_info_list,
	[REPLY_RX_MPDU_CMD]			= iwm_ntf_rx_packet,
	[UMAC_CMD_OPCODE_WIFI_IF_WRAPPER]	= iwm_ntf_wifi_if_wrapper,
};

static const iwm_handler iwm_lmac_handlers[] =
{
	[REPLY_TX]				= iwm_ntf_tx,
	[REPLY_ALIVE]				= iwm_ntf_lmac_version,
	[CALIBRATION_RES_NOTIFICATION]		= iwm_ntf_calib_res,
	[CALIBRATION_COMPLETE_NOTIFICATION]	= iwm_ntf_calib_complete,
	[CALIBRATION_CFG_CMD]			= iwm_ntf_calib_cfg,
	[REPLY_RX_MPDU_CMD]			= iwm_ntf_rx_packet,
	[CARD_STATE_NOTIFICATION]		= iwm_ntf_card_state,
};

void iwm_rx_setup_handlers(struct iwm_priv *iwm)
{
	iwm->umac_handlers = (iwm_handler *) iwm_umac_handlers;
	iwm->lmac_handlers = (iwm_handler *) iwm_lmac_handlers;
}

static void iwm_remove_iv(struct sk_buff *skb, u32 hdr_total_len)
{
	struct ieee80211_hdr *hdr;
	unsigned int hdr_len;

	hdr = (struct ieee80211_hdr *)skb->data;

	if (!ieee80211_has_protected(hdr->frame_control))
		return;

	hdr_len = ieee80211_hdrlen(hdr->frame_control);
	if (hdr_total_len <= hdr_len)
		return;

	memmove(skb->data + (hdr_total_len - hdr_len), skb->data, hdr_len);
	skb_pull(skb, (hdr_total_len - hdr_len));
}

static void iwm_rx_adjust_packet(struct iwm_priv *iwm,
				 struct iwm_rx_packet *packet,
				 struct iwm_rx_ticket_node *ticket_node)
{
	u32 payload_offset = 0, payload_len;
	struct iwm_rx_ticket *ticket = ticket_node->ticket;
	struct iwm_rx_mpdu_hdr *mpdu_hdr;
	struct ieee80211_hdr *hdr;

	mpdu_hdr = (struct iwm_rx_mpdu_hdr *)packet->skb->data;
	payload_offset += sizeof(struct iwm_rx_mpdu_hdr);
	/* Padding is 0 or 2 bytes */
	payload_len = le16_to_cpu(mpdu_hdr->len) +
		(le16_to_cpu(ticket->flags) & IWM_RX_TICKET_PAD_SIZE_MSK);
	payload_len -= ticket->tail_len;

	IWM_DBG_RX(iwm, DBG, "Packet adjusted, len:%d, offset:%d, "
		   "ticket offset:%d ticket tail len:%d\n",
		   payload_len, payload_offset, ticket->payload_offset,
		   ticket->tail_len);

	IWM_HEXDUMP(iwm, DBG, RX, "RAW: ", packet->skb->data, packet->skb->len);

	skb_pull(packet->skb, payload_offset);
	skb_trim(packet->skb, payload_len);

	iwm_remove_iv(packet->skb, ticket->payload_offset);

	hdr = (struct ieee80211_hdr *) packet->skb->data;
	if (ieee80211_is_data_qos(hdr->frame_control)) {
		/* UMAC handed QOS_DATA frame with 2 padding bytes appended
		 * to the qos_ctl field in IEEE 802.11 headers. */
		memmove(packet->skb->data + IEEE80211_QOS_CTL_LEN + 2,
			packet->skb->data,
			ieee80211_hdrlen(hdr->frame_control) -
			IEEE80211_QOS_CTL_LEN);
		hdr = (struct ieee80211_hdr *) skb_pull(packet->skb,
				IEEE80211_QOS_CTL_LEN + 2);
		hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
	}

	IWM_HEXDUMP(iwm, DBG, RX, "ADJUSTED: ",
		    packet->skb->data, packet->skb->len);
}

static void classify8023(struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (ieee80211_is_data_qos(hdr->frame_control)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
		/* frame has qos control */
		skb->priority = *qc & IEEE80211_QOS_CTL_TID_MASK;
	} else {
		skb->priority = 0;
	}
}

static void iwm_rx_process_packet(struct iwm_priv *iwm,
				  struct iwm_rx_packet *packet,
				  struct iwm_rx_ticket_node *ticket_node)
{
	int ret;
	struct sk_buff *skb = packet->skb;
	struct wireless_dev *wdev = iwm_to_wdev(iwm);
	struct net_device *ndev = iwm_to_ndev(iwm);

	IWM_DBG_RX(iwm, DBG, "Processing packet ID %d\n", packet->id);

	switch (le16_to_cpu(ticket_node->ticket->action)) {
	case IWM_RX_TICKET_RELEASE:
		IWM_DBG_RX(iwm, DBG, "RELEASE packet\n");
		classify8023(skb);
		iwm_rx_adjust_packet(iwm, packet, ticket_node);
		ret = ieee80211_data_to_8023(skb, ndev->dev_addr, wdev->iftype);
		if (ret < 0) {
			IWM_DBG_RX(iwm, DBG, "Couldn't convert 802.11 header - "
				   "%d\n", ret);
			break;
		}

		IWM_HEXDUMP(iwm, DBG, RX, "802.3: ", skb->data, skb->len);

		skb->dev = iwm_to_ndev(iwm);
		skb->protocol = eth_type_trans(skb, ndev);
		skb->ip_summed = CHECKSUM_UNNECESSARY;
		memset(skb->cb, 0, sizeof(skb->cb));

		ndev->stats.rx_packets++;
		ndev->stats.rx_bytes += skb->len;

1376
		if (netif_rx_ni(skb) == NET_RX_DROP) {
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
			IWM_ERR(iwm, "Packet dropped\n");
			ndev->stats.rx_dropped++;
		}
		break;
	case IWM_RX_TICKET_DROP:
		IWM_DBG_RX(iwm, DBG, "DROP packet\n");
		kfree_skb(packet->skb);
		break;
	default:
		IWM_ERR(iwm, "Unknow ticket action: %d\n",
			le16_to_cpu(ticket_node->ticket->action));
		kfree_skb(packet->skb);
	}

	kfree(packet);
	iwm_rx_ticket_node_free(ticket_node);
}

/*
 * Rx data processing:
 *
 * We're receiving Rx packet from the LMAC, and Rx ticket from
 * the UMAC.
 * To forward a target data packet upstream (i.e. to the
 * kernel network stack), we must have received an Rx ticket
 * that tells us we're allowed to release this packet (ticket
 * action is IWM_RX_TICKET_RELEASE). The Rx ticket also indicates,
 * among other things, where valid data actually starts in the Rx
 * packet.
 */
void iwm_rx_worker(struct work_struct *work)
{
	struct iwm_priv *iwm;
	struct iwm_rx_ticket_node *ticket, *next;

	iwm = container_of(work, struct iwm_priv, rx_worker);

	/*
	 * We go through the tickets list and if there is a pending
	 * packet for it, we push it upstream.
	 * We stop whenever a ticket is missing its packet, as we're
	 * supposed to send the packets in order.
	 */
	list_for_each_entry_safe(ticket, next, &iwm->rx_tickets, node) {
		struct iwm_rx_packet *packet =
			iwm_rx_packet_get(iwm, le16_to_cpu(ticket->ticket->id));

		if (!packet) {
			IWM_DBG_RX(iwm, DBG, "Skip rx_work: Wait for ticket %d "
				   "to be handled first\n",
				   le16_to_cpu(ticket->ticket->id));
			return;
		}

		list_del(&ticket->node);
		list_del(&packet->node);
		iwm_rx_process_packet(iwm, packet, ticket);
	}
}