mirror of https://gitee.com/openkylin/linux.git
1013 lines
24 KiB
C
1013 lines
24 KiB
C
/*
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* Atheros CARL9170 driver
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*
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* 802.11 & command trap routines
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*
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* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
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* Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, see
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* http://www.gnu.org/licenses/.
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*
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* This file incorporates work covered by the following copyright and
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* permission notice:
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* Copyright (c) 2007-2008 Atheros Communications, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/etherdevice.h>
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#include <linux/crc32.h>
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#include <net/mac80211.h>
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#include "carl9170.h"
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#include "hw.h"
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#include "cmd.h"
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static void carl9170_dbg_message(struct ar9170 *ar, const char *buf, u32 len)
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{
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bool restart = false;
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enum carl9170_restart_reasons reason = CARL9170_RR_NO_REASON;
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if (len > 3) {
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if (memcmp(buf, CARL9170_ERR_MAGIC, 3) == 0) {
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ar->fw.err_counter++;
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if (ar->fw.err_counter > 3) {
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restart = true;
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reason = CARL9170_RR_TOO_MANY_FIRMWARE_ERRORS;
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}
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}
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if (memcmp(buf, CARL9170_BUG_MAGIC, 3) == 0) {
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ar->fw.bug_counter++;
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restart = true;
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reason = CARL9170_RR_FATAL_FIRMWARE_ERROR;
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}
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}
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wiphy_info(ar->hw->wiphy, "FW: %.*s\n", len, buf);
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if (restart)
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carl9170_restart(ar, reason);
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}
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static void carl9170_handle_ps(struct ar9170 *ar, struct carl9170_rsp *rsp)
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{
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u32 ps;
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bool new_ps;
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ps = le32_to_cpu(rsp->psm.state);
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new_ps = (ps & CARL9170_PSM_COUNTER) != CARL9170_PSM_WAKE;
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if (ar->ps.state != new_ps) {
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if (!new_ps) {
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ar->ps.sleep_ms = jiffies_to_msecs(jiffies -
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ar->ps.last_action);
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}
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ar->ps.last_action = jiffies;
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ar->ps.state = new_ps;
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}
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}
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static int carl9170_check_sequence(struct ar9170 *ar, unsigned int seq)
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{
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if (ar->cmd_seq < -1)
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return 0;
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/*
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* Initialize Counter
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*/
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if (ar->cmd_seq < 0)
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ar->cmd_seq = seq;
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/*
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* The sequence is strictly monotonic increasing and it never skips!
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*
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* Therefore we can safely assume that whenever we received an
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* unexpected sequence we have lost some valuable data.
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*/
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if (seq != ar->cmd_seq) {
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int count;
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count = (seq - ar->cmd_seq) % ar->fw.cmd_bufs;
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wiphy_err(ar->hw->wiphy, "lost %d command responses/traps! "
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"w:%d g:%d\n", count, ar->cmd_seq, seq);
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carl9170_restart(ar, CARL9170_RR_LOST_RSP);
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return -EIO;
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}
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ar->cmd_seq = (ar->cmd_seq + 1) % ar->fw.cmd_bufs;
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return 0;
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}
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static void carl9170_cmd_callback(struct ar9170 *ar, u32 len, void *buffer)
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{
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/*
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* Some commands may have a variable response length
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* and we cannot predict the correct length in advance.
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* So we only check if we provided enough space for the data.
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*/
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if (unlikely(ar->readlen != (len - 4))) {
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dev_warn(&ar->udev->dev, "received invalid command response:"
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"got %d, instead of %d\n", len - 4, ar->readlen);
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print_hex_dump_bytes("carl9170 cmd:", DUMP_PREFIX_OFFSET,
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ar->cmd_buf, (ar->cmd.hdr.len + 4) & 0x3f);
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print_hex_dump_bytes("carl9170 rsp:", DUMP_PREFIX_OFFSET,
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buffer, len);
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/*
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* Do not complete. The command times out,
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* and we get a stack trace from there.
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*/
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carl9170_restart(ar, CARL9170_RR_INVALID_RSP);
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}
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spin_lock(&ar->cmd_lock);
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if (ar->readbuf) {
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if (len >= 4)
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memcpy(ar->readbuf, buffer + 4, len - 4);
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ar->readbuf = NULL;
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}
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complete(&ar->cmd_wait);
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spin_unlock(&ar->cmd_lock);
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}
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void carl9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len)
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{
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struct carl9170_rsp *cmd = buf;
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struct ieee80211_vif *vif;
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if ((cmd->hdr.cmd & CARL9170_RSP_FLAG) != CARL9170_RSP_FLAG) {
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if (!(cmd->hdr.cmd & CARL9170_CMD_ASYNC_FLAG))
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carl9170_cmd_callback(ar, len, buf);
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return;
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}
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if (unlikely(cmd->hdr.len != (len - 4))) {
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if (net_ratelimit()) {
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wiphy_err(ar->hw->wiphy, "FW: received over-/under"
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"sized event %x (%d, but should be %d).\n",
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cmd->hdr.cmd, cmd->hdr.len, len - 4);
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print_hex_dump_bytes("dump:", DUMP_PREFIX_NONE,
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buf, len);
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}
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return;
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}
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/* hardware event handlers */
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switch (cmd->hdr.cmd) {
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case CARL9170_RSP_PRETBTT:
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/* pre-TBTT event */
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rcu_read_lock();
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vif = carl9170_get_main_vif(ar);
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if (!vif) {
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rcu_read_unlock();
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break;
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}
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switch (vif->type) {
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case NL80211_IFTYPE_STATION:
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carl9170_handle_ps(ar, cmd);
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break;
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case NL80211_IFTYPE_AP:
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case NL80211_IFTYPE_ADHOC:
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case NL80211_IFTYPE_MESH_POINT:
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carl9170_update_beacon(ar, true);
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break;
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default:
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break;
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}
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rcu_read_unlock();
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break;
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case CARL9170_RSP_TXCOMP:
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/* TX status notification */
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carl9170_tx_process_status(ar, cmd);
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break;
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case CARL9170_RSP_BEACON_CONFIG:
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/*
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* (IBSS) beacon send notification
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* bytes: 04 c2 XX YY B4 B3 B2 B1
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*
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* XX always 80
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* YY always 00
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* B1-B4 "should" be the number of send out beacons.
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*/
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break;
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case CARL9170_RSP_ATIM:
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/* End of Atim Window */
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break;
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case CARL9170_RSP_WATCHDOG:
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/* Watchdog Interrupt */
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carl9170_restart(ar, CARL9170_RR_WATCHDOG);
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break;
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case CARL9170_RSP_TEXT:
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/* firmware debug */
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carl9170_dbg_message(ar, (char *)buf + 4, len - 4);
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break;
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case CARL9170_RSP_HEXDUMP:
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wiphy_dbg(ar->hw->wiphy, "FW: HD %d\n", len - 4);
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print_hex_dump_bytes("FW:", DUMP_PREFIX_NONE,
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(char *)buf + 4, len - 4);
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break;
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case CARL9170_RSP_RADAR:
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if (!net_ratelimit())
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break;
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wiphy_info(ar->hw->wiphy, "FW: RADAR! Please report this "
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"incident to linux-wireless@vger.kernel.org !\n");
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break;
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case CARL9170_RSP_GPIO:
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#ifdef CONFIG_CARL9170_WPC
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if (ar->wps.pbc) {
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bool state = !!(cmd->gpio.gpio & cpu_to_le32(
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AR9170_GPIO_PORT_WPS_BUTTON_PRESSED));
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if (state != ar->wps.pbc_state) {
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ar->wps.pbc_state = state;
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input_report_key(ar->wps.pbc, KEY_WPS_BUTTON,
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state);
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input_sync(ar->wps.pbc);
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}
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}
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#endif /* CONFIG_CARL9170_WPC */
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break;
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case CARL9170_RSP_BOOT:
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complete(&ar->fw_boot_wait);
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break;
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default:
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wiphy_err(ar->hw->wiphy, "FW: received unhandled event %x\n",
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cmd->hdr.cmd);
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print_hex_dump_bytes("dump:", DUMP_PREFIX_NONE, buf, len);
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break;
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}
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}
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static int carl9170_rx_mac_status(struct ar9170 *ar,
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struct ar9170_rx_head *head, struct ar9170_rx_macstatus *mac,
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struct ieee80211_rx_status *status)
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{
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struct ieee80211_channel *chan;
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u8 error, decrypt;
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BUILD_BUG_ON(sizeof(struct ar9170_rx_head) != 12);
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BUILD_BUG_ON(sizeof(struct ar9170_rx_macstatus) != 4);
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error = mac->error;
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if (error & AR9170_RX_ERROR_WRONG_RA) {
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if (!ar->sniffer_enabled)
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return -EINVAL;
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}
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if (error & AR9170_RX_ERROR_PLCP) {
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if (!(ar->filter_state & FIF_PLCPFAIL))
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return -EINVAL;
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status->flag |= RX_FLAG_FAILED_PLCP_CRC;
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}
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if (error & AR9170_RX_ERROR_FCS) {
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ar->tx_fcs_errors++;
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if (!(ar->filter_state & FIF_FCSFAIL))
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return -EINVAL;
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status->flag |= RX_FLAG_FAILED_FCS_CRC;
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}
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decrypt = ar9170_get_decrypt_type(mac);
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if (!(decrypt & AR9170_RX_ENC_SOFTWARE) &&
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decrypt != AR9170_ENC_ALG_NONE) {
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if ((decrypt == AR9170_ENC_ALG_TKIP) &&
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(error & AR9170_RX_ERROR_MMIC))
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status->flag |= RX_FLAG_MMIC_ERROR;
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status->flag |= RX_FLAG_DECRYPTED;
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}
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if (error & AR9170_RX_ERROR_DECRYPT && !ar->sniffer_enabled)
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return -ENODATA;
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error &= ~(AR9170_RX_ERROR_MMIC |
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AR9170_RX_ERROR_FCS |
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AR9170_RX_ERROR_WRONG_RA |
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AR9170_RX_ERROR_DECRYPT |
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AR9170_RX_ERROR_PLCP);
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/* drop any other error frames */
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if (unlikely(error)) {
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/* TODO: update netdevice's RX dropped/errors statistics */
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if (net_ratelimit())
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wiphy_dbg(ar->hw->wiphy, "received frame with "
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"suspicious error code (%#x).\n", error);
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return -EINVAL;
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}
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chan = ar->channel;
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if (chan) {
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status->band = chan->band;
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status->freq = chan->center_freq;
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}
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switch (mac->status & AR9170_RX_STATUS_MODULATION) {
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case AR9170_RX_STATUS_MODULATION_CCK:
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if (mac->status & AR9170_RX_STATUS_SHORT_PREAMBLE)
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status->flag |= RX_FLAG_SHORTPRE;
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switch (head->plcp[0]) {
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case AR9170_RX_PHY_RATE_CCK_1M:
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status->rate_idx = 0;
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break;
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case AR9170_RX_PHY_RATE_CCK_2M:
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status->rate_idx = 1;
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break;
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case AR9170_RX_PHY_RATE_CCK_5M:
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status->rate_idx = 2;
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break;
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case AR9170_RX_PHY_RATE_CCK_11M:
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status->rate_idx = 3;
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break;
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default:
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if (net_ratelimit()) {
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wiphy_err(ar->hw->wiphy, "invalid plcp cck "
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"rate (%x).\n", head->plcp[0]);
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}
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return -EINVAL;
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}
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break;
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case AR9170_RX_STATUS_MODULATION_DUPOFDM:
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case AR9170_RX_STATUS_MODULATION_OFDM:
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switch (head->plcp[0] & 0xf) {
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case AR9170_TXRX_PHY_RATE_OFDM_6M:
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status->rate_idx = 0;
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break;
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case AR9170_TXRX_PHY_RATE_OFDM_9M:
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status->rate_idx = 1;
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break;
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case AR9170_TXRX_PHY_RATE_OFDM_12M:
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status->rate_idx = 2;
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break;
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case AR9170_TXRX_PHY_RATE_OFDM_18M:
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status->rate_idx = 3;
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break;
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case AR9170_TXRX_PHY_RATE_OFDM_24M:
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status->rate_idx = 4;
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break;
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case AR9170_TXRX_PHY_RATE_OFDM_36M:
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status->rate_idx = 5;
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break;
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case AR9170_TXRX_PHY_RATE_OFDM_48M:
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status->rate_idx = 6;
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break;
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case AR9170_TXRX_PHY_RATE_OFDM_54M:
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status->rate_idx = 7;
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break;
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default:
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if (net_ratelimit()) {
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wiphy_err(ar->hw->wiphy, "invalid plcp ofdm "
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"rate (%x).\n", head->plcp[0]);
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}
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return -EINVAL;
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}
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if (status->band == IEEE80211_BAND_2GHZ)
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status->rate_idx += 4;
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break;
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case AR9170_RX_STATUS_MODULATION_HT:
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if (head->plcp[3] & 0x80)
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status->flag |= RX_FLAG_40MHZ;
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if (head->plcp[6] & 0x80)
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status->flag |= RX_FLAG_SHORT_GI;
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status->rate_idx = clamp(0, 75, head->plcp[3] & 0x7f);
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status->flag |= RX_FLAG_HT;
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break;
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default:
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BUG();
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return -ENOSYS;
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}
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return 0;
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}
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static void carl9170_rx_phy_status(struct ar9170 *ar,
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struct ar9170_rx_phystatus *phy, struct ieee80211_rx_status *status)
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{
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int i;
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BUILD_BUG_ON(sizeof(struct ar9170_rx_phystatus) != 20);
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for (i = 0; i < 3; i++)
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if (phy->rssi[i] != 0x80)
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status->antenna |= BIT(i);
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/* post-process RSSI */
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for (i = 0; i < 7; i++)
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if (phy->rssi[i] & 0x80)
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phy->rssi[i] = ((~phy->rssi[i] & 0x7f) + 1) & 0x7f;
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|
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/* TODO: we could do something with phy_errors */
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status->signal = ar->noise[0] + phy->rssi_combined;
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}
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static struct sk_buff *carl9170_rx_copy_data(u8 *buf, int len)
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{
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struct sk_buff *skb;
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int reserved = 0;
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struct ieee80211_hdr *hdr = (void *) buf;
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if (ieee80211_is_data_qos(hdr->frame_control)) {
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u8 *qc = ieee80211_get_qos_ctl(hdr);
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reserved += NET_IP_ALIGN;
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if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
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reserved += NET_IP_ALIGN;
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}
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if (ieee80211_has_a4(hdr->frame_control))
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reserved += NET_IP_ALIGN;
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reserved = 32 + (reserved & NET_IP_ALIGN);
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skb = dev_alloc_skb(len + reserved);
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if (likely(skb)) {
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skb_reserve(skb, reserved);
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memcpy(skb_put(skb, len), buf, len);
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}
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return skb;
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}
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static u8 *carl9170_find_ie(u8 *data, unsigned int len, u8 ie)
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{
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struct ieee80211_mgmt *mgmt = (void *)data;
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u8 *pos, *end;
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pos = (u8 *)mgmt->u.beacon.variable;
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end = data + len;
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while (pos < end) {
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if (pos + 2 + pos[1] > end)
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return NULL;
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if (pos[0] == ie)
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return pos;
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|
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pos += 2 + pos[1];
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}
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return NULL;
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}
|
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|
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/*
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* NOTE:
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*
|
|
* The firmware is in charge of waking up the device just before
|
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* 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 = data;
|
|
struct ieee80211_tim_ie *tim_ie;
|
|
struct ath_common *common = &ar->common;
|
|
u8 *tim;
|
|
u8 tim_len;
|
|
bool cam;
|
|
|
|
if (likely(!(ar->hw->conf.flags & IEEE80211_CONF_PS)))
|
|
return;
|
|
|
|
/* min. beacon length + FCS_LEN */
|
|
if (len <= 40 + FCS_LEN)
|
|
return;
|
|
|
|
/* check if this really is a beacon */
|
|
/* and only beacons from the associated BSSID, please */
|
|
if (!ath_is_mybeacon(common, hdr) || !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 void carl9170_ba_check(struct ar9170 *ar, void *data, unsigned int len)
|
|
{
|
|
struct ieee80211_bar *bar = data;
|
|
struct carl9170_bar_list_entry *entry;
|
|
unsigned int queue;
|
|
|
|
if (likely(!ieee80211_is_back(bar->frame_control)))
|
|
return;
|
|
|
|
if (len <= sizeof(*bar) + FCS_LEN)
|
|
return;
|
|
|
|
queue = TID_TO_WME_AC(((le16_to_cpu(bar->control) &
|
|
IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
|
|
IEEE80211_BAR_CTRL_TID_INFO_SHIFT) & 7);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(entry, &ar->bar_list[queue], list) {
|
|
struct sk_buff *entry_skb = entry->skb;
|
|
struct _carl9170_tx_superframe *super = (void *)entry_skb->data;
|
|
struct ieee80211_bar *entry_bar = (void *)super->frame_data;
|
|
|
|
#define TID_CHECK(a, b) ( \
|
|
((a) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK)) == \
|
|
((b) & cpu_to_le16(IEEE80211_BAR_CTRL_TID_INFO_MASK))) \
|
|
|
|
if (bar->start_seq_num == entry_bar->start_seq_num &&
|
|
TID_CHECK(bar->control, entry_bar->control) &&
|
|
ether_addr_equal_64bits(bar->ra, entry_bar->ta) &&
|
|
ether_addr_equal_64bits(bar->ta, entry_bar->ra)) {
|
|
struct ieee80211_tx_info *tx_info;
|
|
|
|
tx_info = IEEE80211_SKB_CB(entry_skb);
|
|
tx_info->flags |= IEEE80211_TX_STAT_ACK;
|
|
|
|
spin_lock_bh(&ar->bar_list_lock[queue]);
|
|
list_del_rcu(&entry->list);
|
|
spin_unlock_bh(&ar->bar_list_lock[queue]);
|
|
kfree_rcu(entry, head);
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
#undef TID_CHECK
|
|
}
|
|
|
|
static bool carl9170_ampdu_check(struct ar9170 *ar, u8 *buf, u8 ms,
|
|
struct ieee80211_rx_status *rx_status)
|
|
{
|
|
__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;
|
|
}
|
|
|
|
rx_status->flag |= RX_FLAG_AMPDU_DETAILS | RX_FLAG_AMPDU_LAST_KNOWN;
|
|
rx_status->ampdu_reference = ar->ampdu_ref;
|
|
|
|
/*
|
|
* "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;
|
|
}
|
|
|
|
static int carl9170_handle_mpdu(struct ar9170 *ar, u8 *buf, int len,
|
|
struct ieee80211_rx_status *status)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
/* (driver) frame trap handler
|
|
*
|
|
* Because power-saving mode handing has to be implemented by
|
|
* the driver/firmware. We have to check each incoming beacon
|
|
* from the associated AP, if there's new data for us (either
|
|
* broadcast/multicast or unicast) we have to react quickly.
|
|
*
|
|
* So, if you have you want to add additional frame trap
|
|
* handlers, this would be the perfect place!
|
|
*/
|
|
|
|
carl9170_ps_beacon(ar, buf, len);
|
|
|
|
carl9170_ba_check(ar, buf, len);
|
|
|
|
skb = carl9170_rx_copy_data(buf, len);
|
|
if (!skb)
|
|
return -ENOMEM;
|
|
|
|
memcpy(IEEE80211_SKB_RXCB(skb), status, sizeof(*status));
|
|
ieee80211_rx(ar->hw, skb);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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_rx_untie_data(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;
|
|
int mpdu_len;
|
|
u8 mac_status;
|
|
|
|
if (!IS_STARTED(ar))
|
|
return;
|
|
|
|
if (unlikely(len < sizeof(*mac)))
|
|
goto drop;
|
|
|
|
memset(&status, 0, sizeof(status));
|
|
|
|
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:
|
|
ar->ampdu_ref++;
|
|
/* 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:
|
|
status.flag |= RX_FLAG_AMPDU_IS_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;
|
|
|
|
if (unlikely(carl9170_rx_mac_status(ar, head, mac, &status)))
|
|
goto drop;
|
|
|
|
if (!carl9170_ampdu_check(ar, buf, mac_status, &status))
|
|
goto drop;
|
|
|
|
if (phy)
|
|
carl9170_rx_phy_status(ar, phy, &status);
|
|
else
|
|
status.flag |= RX_FLAG_NO_SIGNAL_VAL;
|
|
|
|
if (carl9170_handle_mpdu(ar, buf, mpdu_len, &status))
|
|
goto drop;
|
|
|
|
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;
|
|
|
|
if (carl9170_check_sequence(ar, cmd->hdr.seq))
|
|
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_rx_untie_data(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 guaranteed, 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);
|
|
}
|