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linux/drivers/net/wireless/ath/carl9170/rx.c

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/*
* Atheros CARL9170 driver
*
* 802.11 & command trap routines
*
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
* Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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; see the file COPYING. If not, see
* http://www.gnu.org/licenses/.
*
* This file incorporates work covered by the following copyright and
* permission notice:
* Copyright (c) 2007-2008 Atheros Communications, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>
#include <net/mac80211.h>
#include "carl9170.h"
#include "hw.h"
#include "cmd.h"
static void carl9170_dbg_message(struct ar9170 *ar, const char *buf, u32 len)
{
bool restart = false;
enum carl9170_restart_reasons reason = CARL9170_RR_NO_REASON;
if (len > 3) {
if (memcmp(buf, CARL9170_ERR_MAGIC, 3) == 0) {
ar->fw.err_counter++;
if (ar->fw.err_counter > 3) {
restart = true;
reason = CARL9170_RR_TOO_MANY_FIRMWARE_ERRORS;
}
}
if (memcmp(buf, CARL9170_BUG_MAGIC, 3) == 0) {
ar->fw.bug_counter++;
restart = true;
reason = CARL9170_RR_FATAL_FIRMWARE_ERROR;
}
}
wiphy_info(ar->hw->wiphy, "FW: %.*s\n", len, buf);
if (restart)
carl9170_restart(ar, reason);
}
static void carl9170_handle_ps(struct ar9170 *ar, struct carl9170_rsp *rsp)
{
u32 ps;
bool new_ps;
ps = le32_to_cpu(rsp->psm.state);
new_ps = (ps & CARL9170_PSM_COUNTER) != CARL9170_PSM_WAKE;
if (ar->ps.state != new_ps) {
if (!new_ps) {
ar->ps.sleep_ms = jiffies_to_msecs(jiffies -
ar->ps.last_action);
}
ar->ps.last_action = jiffies;
ar->ps.state = new_ps;
}
}
static int carl9170_check_sequence(struct ar9170 *ar, unsigned int seq)
{
if (ar->cmd_seq < -1)
return 0;
/*
* Initialize Counter
*/
if (ar->cmd_seq < 0)
ar->cmd_seq = seq;
/*
* The sequence is strictly monotonic increasing and it never skips!
*
* Therefore we can safely assume that whenever we received an
* unexpected sequence we have lost some valuable data.
*/
if (seq != ar->cmd_seq) {
int count;
count = (seq - ar->cmd_seq) % ar->fw.cmd_bufs;
wiphy_err(ar->hw->wiphy, "lost %d command responses/traps! "
"w:%d g:%d\n", count, ar->cmd_seq, seq);
carl9170_restart(ar, CARL9170_RR_LOST_RSP);
return -EIO;
}
ar->cmd_seq = (ar->cmd_seq + 1) % ar->fw.cmd_bufs;
return 0;
}
static void carl9170_cmd_callback(struct ar9170 *ar, u32 len, void *buffer)
{
/*
* Some commands may have a variable response length
* and we cannot predict the correct length in advance.
* So we only check if we provided enough space for the data.
*/
if (unlikely(ar->readlen != (len - 4))) {
dev_warn(&ar->udev->dev, "received invalid command response:"
"got %d, instead of %d\n", len - 4, ar->readlen);
print_hex_dump_bytes("carl9170 cmd:", DUMP_PREFIX_OFFSET,
ar->cmd_buf, (ar->cmd.hdr.len + 4) & 0x3f);
print_hex_dump_bytes("carl9170 rsp:", DUMP_PREFIX_OFFSET,
buffer, len);
/*
* Do not complete. The command times out,
* and we get a stack trace from there.
*/
carl9170_restart(ar, CARL9170_RR_INVALID_RSP);
}
spin_lock(&ar->cmd_lock);
if (ar->readbuf) {
if (len >= 4)
memcpy(ar->readbuf, buffer + 4, len - 4);
ar->readbuf = NULL;
}
complete(&ar->cmd_wait);
spin_unlock(&ar->cmd_lock);
}
void carl9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len)
{
struct carl9170_rsp *cmd = (void *) buf;
struct ieee80211_vif *vif;
if (carl9170_check_sequence(ar, cmd->hdr.seq))
return;
if ((cmd->hdr.cmd & CARL9170_RSP_FLAG) != CARL9170_RSP_FLAG) {
if (!(cmd->hdr.cmd & CARL9170_CMD_ASYNC_FLAG))
carl9170_cmd_callback(ar, len, buf);
return;
}
if (unlikely(cmd->hdr.len != (len - 4))) {
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy, "FW: received over-/under"
"sized event %x (%d, but should be %d).\n",
cmd->hdr.cmd, cmd->hdr.len, len - 4);
print_hex_dump_bytes("dump:", DUMP_PREFIX_NONE,
buf, len);
}
return;
}
/* hardware event handlers */
switch (cmd->hdr.cmd) {
case CARL9170_RSP_PRETBTT:
/* pre-TBTT event */
rcu_read_lock();
vif = carl9170_get_main_vif(ar);
if (!vif) {
rcu_read_unlock();
break;
}
switch (vif->type) {
case NL80211_IFTYPE_STATION:
carl9170_handle_ps(ar, cmd);
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_ADHOC:
carl9170_update_beacon(ar, true);
break;
default:
break;
}
rcu_read_unlock();
break;
case CARL9170_RSP_TXCOMP:
/* TX status notification */
carl9170_tx_process_status(ar, cmd);
break;
case CARL9170_RSP_BEACON_CONFIG:
/*
* (IBSS) beacon send notification
* bytes: 04 c2 XX YY B4 B3 B2 B1
*
* XX always 80
* YY always 00
* B1-B4 "should" be the number of send out beacons.
*/
break;
case CARL9170_RSP_ATIM:
/* End of Atim Window */
break;
case CARL9170_RSP_WATCHDOG:
/* Watchdog Interrupt */
carl9170_restart(ar, CARL9170_RR_WATCHDOG);
break;
case CARL9170_RSP_TEXT:
/* firmware debug */
carl9170_dbg_message(ar, (char *)buf + 4, len - 4);
break;
case CARL9170_RSP_HEXDUMP:
wiphy_dbg(ar->hw->wiphy, "FW: HD %d\n", len - 4);
print_hex_dump_bytes("FW:", DUMP_PREFIX_NONE,
(char *)buf + 4, len - 4);
break;
case CARL9170_RSP_RADAR:
if (!net_ratelimit())
break;
wiphy_info(ar->hw->wiphy, "FW: RADAR! Please report this "
"incident to linux-wireless@vger.kernel.org !\n");
break;
case CARL9170_RSP_GPIO:
#ifdef CONFIG_CARL9170_WPC
if (ar->wps.pbc) {
bool state = !!(cmd->gpio.gpio & cpu_to_le32(
AR9170_GPIO_PORT_WPS_BUTTON_PRESSED));
if (state != ar->wps.pbc_state) {
ar->wps.pbc_state = state;
input_report_key(ar->wps.pbc, KEY_WPS_BUTTON,
state);
input_sync(ar->wps.pbc);
}
}
#endif /* CONFIG_CARL9170_WPC */
break;
case CARL9170_RSP_BOOT:
complete(&ar->fw_boot_wait);
break;
default:
wiphy_err(ar->hw->wiphy, "FW: received unhandled event %x\n",
cmd->hdr.cmd);
print_hex_dump_bytes("dump:", DUMP_PREFIX_NONE, buf, len);
break;
}
}
static int carl9170_rx_mac_status(struct ar9170 *ar,
struct ar9170_rx_head *head, struct ar9170_rx_macstatus *mac,
struct ieee80211_rx_status *status)
{
struct ieee80211_channel *chan;
u8 error, decrypt;
BUILD_BUG_ON(sizeof(struct ar9170_rx_head) != 12);
BUILD_BUG_ON(sizeof(struct ar9170_rx_macstatus) != 4);
error = mac->error;
if (error & AR9170_RX_ERROR_WRONG_RA) {
if (!ar->sniffer_enabled)
return -EINVAL;
}
if (error & AR9170_RX_ERROR_PLCP) {
if (!(ar->filter_state & FIF_PLCPFAIL))
return -EINVAL;
status->flag |= RX_FLAG_FAILED_PLCP_CRC;
}
if (error & AR9170_RX_ERROR_FCS) {
ar->tx_fcs_errors++;
if (!(ar->filter_state & FIF_FCSFAIL))
return -EINVAL;
status->flag |= RX_FLAG_FAILED_FCS_CRC;
}
decrypt = ar9170_get_decrypt_type(mac);
if (!(decrypt & AR9170_RX_ENC_SOFTWARE) &&
decrypt != AR9170_ENC_ALG_NONE) {
if ((decrypt == AR9170_ENC_ALG_TKIP) &&
(error & AR9170_RX_ERROR_MMIC))
status->flag |= RX_FLAG_MMIC_ERROR;
status->flag |= RX_FLAG_DECRYPTED;
}
if (error & AR9170_RX_ERROR_DECRYPT && !ar->sniffer_enabled)
return -ENODATA;
error &= ~(AR9170_RX_ERROR_MMIC |
AR9170_RX_ERROR_FCS |
AR9170_RX_ERROR_WRONG_RA |
AR9170_RX_ERROR_DECRYPT |
AR9170_RX_ERROR_PLCP);
/* drop any other error frames */
if (unlikely(error)) {
/* TODO: update netdevice's RX dropped/errors statistics */
if (net_ratelimit())
wiphy_dbg(ar->hw->wiphy, "received frame with "
"suspicious error code (%#x).\n", error);
return -EINVAL;
}
chan = ar->channel;
if (chan) {
status->band = chan->band;
status->freq = chan->center_freq;
}
switch (mac->status & AR9170_RX_STATUS_MODULATION) {
case AR9170_RX_STATUS_MODULATION_CCK:
if (mac->status & AR9170_RX_STATUS_SHORT_PREAMBLE)
status->flag |= RX_FLAG_SHORTPRE;
switch (head->plcp[0]) {
case AR9170_RX_PHY_RATE_CCK_1M:
status->rate_idx = 0;
break;
case AR9170_RX_PHY_RATE_CCK_2M:
status->rate_idx = 1;
break;
case AR9170_RX_PHY_RATE_CCK_5M:
status->rate_idx = 2;
break;
case AR9170_RX_PHY_RATE_CCK_11M:
status->rate_idx = 3;
break;
default:
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy, "invalid plcp cck "
"rate (%x).\n", head->plcp[0]);
}
return -EINVAL;
}
break;
case AR9170_RX_STATUS_MODULATION_DUPOFDM:
case AR9170_RX_STATUS_MODULATION_OFDM:
switch (head->plcp[0] & 0xf) {
case AR9170_TXRX_PHY_RATE_OFDM_6M:
status->rate_idx = 0;
break;
case AR9170_TXRX_PHY_RATE_OFDM_9M:
status->rate_idx = 1;
break;
case AR9170_TXRX_PHY_RATE_OFDM_12M:
status->rate_idx = 2;
break;
case AR9170_TXRX_PHY_RATE_OFDM_18M:
status->rate_idx = 3;
break;
case AR9170_TXRX_PHY_RATE_OFDM_24M:
status->rate_idx = 4;
break;
case AR9170_TXRX_PHY_RATE_OFDM_36M:
status->rate_idx = 5;
break;
case AR9170_TXRX_PHY_RATE_OFDM_48M:
status->rate_idx = 6;
break;
case AR9170_TXRX_PHY_RATE_OFDM_54M:
status->rate_idx = 7;
break;
default:
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy, "invalid plcp ofdm "
"rate (%x).\n", head->plcp[0]);
}
return -EINVAL;
}
if (status->band == IEEE80211_BAND_2GHZ)
status->rate_idx += 4;
break;
case AR9170_RX_STATUS_MODULATION_HT:
if (head->plcp[3] & 0x80)
status->flag |= RX_FLAG_40MHZ;
if (head->plcp[6] & 0x80)
status->flag |= RX_FLAG_SHORT_GI;
status->rate_idx = clamp(0, 75, head->plcp[3] & 0x7f);
status->flag |= RX_FLAG_HT;
break;
default:
BUG();
return -ENOSYS;
}
return 0;
}
static void carl9170_rx_phy_status(struct ar9170 *ar,
struct ar9170_rx_phystatus *phy, struct ieee80211_rx_status *status)
{
int i;
BUILD_BUG_ON(sizeof(struct ar9170_rx_phystatus) != 20);
for (i = 0; i < 3; i++)
if (phy->rssi[i] != 0x80)
status->antenna |= BIT(i);
/* post-process RSSI */
for (i = 0; i < 7; i++)
if (phy->rssi[i] & 0x80)
phy->rssi[i] = ((phy->rssi[i] & 0x7f) + 1) & 0x7f;
/* TODO: we could do something with phy_errors */
status->signal = ar->noise[0] + phy->rssi_combined;
}
static struct sk_buff *carl9170_rx_copy_data(u8 *buf, int len)
{
struct sk_buff *skb;
int reserved = 0;
struct ieee80211_hdr *hdr = (void *) buf;
if (ieee80211_is_data_qos(hdr->frame_control)) {
u8 *qc = ieee80211_get_qos_ctl(hdr);
reserved += NET_IP_ALIGN;
if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT)
reserved += NET_IP_ALIGN;
}
if (ieee80211_has_a4(hdr->frame_control))
reserved += NET_IP_ALIGN;
reserved = 32 + (reserved & NET_IP_ALIGN);
skb = dev_alloc_skb(len + reserved);
if (likely(skb)) {
skb_reserve(skb, reserved);
memcpy(skb_put(skb, len), buf, len);
}
return skb;
}
static u8 *carl9170_find_ie(u8 *data, unsigned int len, u8 ie)
{
struct ieee80211_mgmt *mgmt = (void *)data;
u8 *pos, *end;
pos = (u8 *)mgmt->u.beacon.variable;
end = data + len;
while (pos < end) {
if (pos + 2 + pos[1] > end)
return NULL;
if (pos[0] == ie)
return pos;
pos += 2 + pos[1];
}
return NULL;
}
/*
* NOTE:
*
* The firmware is in charge of waking up the device just before
* the AP is expected to transmit the next beacon.
*
* This leaves the driver with the important task of deciding when
* to set the PHY back to bed again.
*/
static void carl9170_ps_beacon(struct ar9170 *ar, void *data, unsigned int len)
{
struct ieee80211_hdr *hdr = (void *) data;
struct ieee80211_tim_ie *tim_ie;
u8 *tim;
u8 tim_len;
bool cam;
if (likely(!(ar->hw->conf.flags & IEEE80211_CONF_PS)))
return;
/* check if this really is a beacon */
if (!ieee80211_is_beacon(hdr->frame_control))
return;
/* min. beacon length + FCS_LEN */
if (len <= 40 + FCS_LEN)
return;
/* and only beacons from the associated BSSID, please */
if (compare_ether_addr(hdr->addr3, ar->common.curbssid) ||
!ar->common.curaid)
return;
ar->ps.last_beacon = jiffies;
tim = carl9170_find_ie(data, len - FCS_LEN, WLAN_EID_TIM);
if (!tim)
return;
if (tim[1] < sizeof(*tim_ie))
return;
tim_len = tim[1];
tim_ie = (struct ieee80211_tim_ie *) &tim[2];
if (!WARN_ON_ONCE(!ar->hw->conf.ps_dtim_period))
ar->ps.dtim_counter = (tim_ie->dtim_count - 1) %
ar->hw->conf.ps_dtim_period;
/* Check whenever the PHY can be turned off again. */
/* 1. What about buffered unicast traffic for our AID? */
cam = ieee80211_check_tim(tim_ie, tim_len, ar->common.curaid);
/* 2. Maybe the AP wants to send multicast/broadcast data? */
cam = !!(tim_ie->bitmap_ctrl & 0x01);
if (!cam) {
/* back to low-power land. */
ar->ps.off_override &= ~PS_OFF_BCN;
carl9170_ps_check(ar);
} else {
/* force CAM */
ar->ps.off_override |= PS_OFF_BCN;
}
}
static bool carl9170_ampdu_check(struct ar9170 *ar, u8 *buf, u8 ms)
{
__le16 fc;
if ((ms & AR9170_RX_STATUS_MPDU) == AR9170_RX_STATUS_MPDU_SINGLE) {
/*
* This frame is not part of an aMPDU.
* Therefore it is not subjected to any
* of the following content restrictions.
*/
return true;
}
/*
* "802.11n - 7.4a.3 A-MPDU contents" describes in which contexts
* certain frame types can be part of an aMPDU.
*
* In order to keep the processing cost down, I opted for a
* stateless filter solely based on the frame control field.
*/
fc = ((struct ieee80211_hdr *)buf)->frame_control;
if (ieee80211_is_data_qos(fc) && ieee80211_is_data_present(fc))
return true;
if (ieee80211_is_ack(fc) || ieee80211_is_back(fc) ||
ieee80211_is_back_req(fc))
return true;
if (ieee80211_is_action(fc))
return true;
return false;
}
/*
* If the frame alignment is right (or the kernel has
* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS), and there
* is only a single MPDU in the USB frame, then we could
* submit to mac80211 the SKB directly. However, since
* there may be multiple packets in one SKB in stream
* mode, and we need to observe the proper ordering,
* this is non-trivial.
*/
static void carl9170_handle_mpdu(struct ar9170 *ar, u8 *buf, int len)
{
struct ar9170_rx_head *head;
struct ar9170_rx_macstatus *mac;
struct ar9170_rx_phystatus *phy = NULL;
struct ieee80211_rx_status status;
struct sk_buff *skb;
int mpdu_len;
u8 mac_status;
if (!IS_STARTED(ar))
return;
if (unlikely(len < sizeof(*mac)))
goto drop;
mpdu_len = len - sizeof(*mac);
mac = (void *)(buf + mpdu_len);
mac_status = mac->status;
switch (mac_status & AR9170_RX_STATUS_MPDU) {
case AR9170_RX_STATUS_MPDU_FIRST:
/* Aggregated MPDUs start with an PLCP header */
if (likely(mpdu_len >= sizeof(struct ar9170_rx_head))) {
head = (void *) buf;
/*
* The PLCP header needs to be cached for the
* following MIDDLE + LAST A-MPDU packets.
*
* So, if you are wondering why all frames seem
* to share a common RX status information,
* then you have the answer right here...
*/
memcpy(&ar->rx_plcp, (void *) buf,
sizeof(struct ar9170_rx_head));
mpdu_len -= sizeof(struct ar9170_rx_head);
buf += sizeof(struct ar9170_rx_head);
ar->rx_has_plcp = true;
} else {
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy, "plcp info "
"is clipped.\n");
}
goto drop;
}
break;
case AR9170_RX_STATUS_MPDU_LAST:
/*
* The last frame of an A-MPDU has an extra tail
* which does contain the phy status of the whole
* aggregate.
*/
if (likely(mpdu_len >= sizeof(struct ar9170_rx_phystatus))) {
mpdu_len -= sizeof(struct ar9170_rx_phystatus);
phy = (void *)(buf + mpdu_len);
} else {
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy, "frame tail "
"is clipped.\n");
}
goto drop;
}
case AR9170_RX_STATUS_MPDU_MIDDLE:
/* These are just data + mac status */
if (unlikely(!ar->rx_has_plcp)) {
if (!net_ratelimit())
return;
wiphy_err(ar->hw->wiphy, "rx stream does not start "
"with a first_mpdu frame tag.\n");
goto drop;
}
head = &ar->rx_plcp;
break;
case AR9170_RX_STATUS_MPDU_SINGLE:
/* single mpdu has both: plcp (head) and phy status (tail) */
head = (void *) buf;
mpdu_len -= sizeof(struct ar9170_rx_head);
mpdu_len -= sizeof(struct ar9170_rx_phystatus);
buf += sizeof(struct ar9170_rx_head);
phy = (void *)(buf + mpdu_len);
break;
default:
BUG_ON(1);
break;
}
/* FC + DU + RA + FCS */
if (unlikely(mpdu_len < (2 + 2 + ETH_ALEN + FCS_LEN)))
goto drop;
memset(&status, 0, sizeof(status));
if (unlikely(carl9170_rx_mac_status(ar, head, mac, &status)))
goto drop;
if (!carl9170_ampdu_check(ar, buf, mac_status))
goto drop;
if (phy)
carl9170_rx_phy_status(ar, phy, &status);
carl9170_ps_beacon(ar, buf, mpdu_len);
skb = carl9170_rx_copy_data(buf, mpdu_len);
if (!skb)
goto drop;
memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
ieee80211_rx(ar->hw, skb);
return;
drop:
ar->rx_dropped++;
}
static void carl9170_rx_untie_cmds(struct ar9170 *ar, const u8 *respbuf,
const unsigned int resplen)
{
struct carl9170_rsp *cmd;
int i = 0;
while (i < resplen) {
cmd = (void *) &respbuf[i];
i += cmd->hdr.len + 4;
if (unlikely(i > resplen))
break;
carl9170_handle_command_response(ar, cmd, cmd->hdr.len + 4);
}
if (unlikely(i != resplen)) {
if (!net_ratelimit())
return;
wiphy_err(ar->hw->wiphy, "malformed firmware trap:\n");
print_hex_dump_bytes("rxcmd:", DUMP_PREFIX_OFFSET,
respbuf, resplen);
}
}
static void __carl9170_rx(struct ar9170 *ar, u8 *buf, unsigned int len)
{
unsigned int i = 0;
/* weird thing, but this is the same in the original driver */
while (len > 2 && i < 12 && buf[0] == 0xff && buf[1] == 0xff) {
i += 2;
len -= 2;
buf += 2;
}
if (unlikely(len < 4))
return;
/* found the 6 * 0xffff marker? */
if (i == 12)
carl9170_rx_untie_cmds(ar, buf, len);
else
carl9170_handle_mpdu(ar, buf, len);
}
static void carl9170_rx_stream(struct ar9170 *ar, void *buf, unsigned int len)
{
unsigned int tlen, wlen = 0, clen = 0;
struct ar9170_stream *rx_stream;
u8 *tbuf;
tbuf = buf;
tlen = len;
while (tlen >= 4) {
rx_stream = (void *) tbuf;
clen = le16_to_cpu(rx_stream->length);
wlen = ALIGN(clen, 4);
/* check if this is stream has a valid tag.*/
if (rx_stream->tag != cpu_to_le16(AR9170_RX_STREAM_TAG)) {
/*
* TODO: handle the highly unlikely event that the
* corrupted stream has the TAG at the right position.
*/
/* check if the frame can be repaired. */
if (!ar->rx_failover_missing) {
/* this is not "short read". */
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy,
"missing tag!\n");
}
__carl9170_rx(ar, tbuf, tlen);
return;
}
if (ar->rx_failover_missing > tlen) {
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy,
"possible multi "
"stream corruption!\n");
goto err_telluser;
} else {
goto err_silent;
}
}
memcpy(skb_put(ar->rx_failover, tlen), tbuf, tlen);
ar->rx_failover_missing -= tlen;
if (ar->rx_failover_missing <= 0) {
/*
* nested carl9170_rx_stream call!
*
* termination is guranteed, even when the
* combined frame also have an element with
* a bad tag.
*/
ar->rx_failover_missing = 0;
carl9170_rx_stream(ar, ar->rx_failover->data,
ar->rx_failover->len);
skb_reset_tail_pointer(ar->rx_failover);
skb_trim(ar->rx_failover, 0);
}
return;
}
/* check if stream is clipped */
if (wlen > tlen - 4) {
if (ar->rx_failover_missing) {
/* TODO: handle double stream corruption. */
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy, "double rx "
"stream corruption!\n");
goto err_telluser;
} else {
goto err_silent;
}
}
/*
* save incomplete data set.
* the firmware will resend the missing bits when
* the rx - descriptor comes round again.
*/
memcpy(skb_put(ar->rx_failover, tlen), tbuf, tlen);
ar->rx_failover_missing = clen - tlen;
return;
}
__carl9170_rx(ar, rx_stream->payload, clen);
tbuf += wlen + 4;
tlen -= wlen + 4;
}
if (tlen) {
if (net_ratelimit()) {
wiphy_err(ar->hw->wiphy, "%d bytes of unprocessed "
"data left in rx stream!\n", tlen);
}
goto err_telluser;
}
return;
err_telluser:
wiphy_err(ar->hw->wiphy, "damaged RX stream data [want:%d, "
"data:%d, rx:%d, pending:%d ]\n", clen, wlen, tlen,
ar->rx_failover_missing);
if (ar->rx_failover_missing)
print_hex_dump_bytes("rxbuf:", DUMP_PREFIX_OFFSET,
ar->rx_failover->data,
ar->rx_failover->len);
print_hex_dump_bytes("stream:", DUMP_PREFIX_OFFSET,
buf, len);
wiphy_err(ar->hw->wiphy, "please check your hardware and cables, if "
"you see this message frequently.\n");
err_silent:
if (ar->rx_failover_missing) {
skb_reset_tail_pointer(ar->rx_failover);
skb_trim(ar->rx_failover, 0);
ar->rx_failover_missing = 0;
}
}
void carl9170_rx(struct ar9170 *ar, void *buf, unsigned int len)
{
if (ar->fw.rx_stream)
carl9170_rx_stream(ar, buf, len);
else
__carl9170_rx(ar, buf, len);
}
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