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1013 lines
24 KiB
1013 lines
24 KiB
/* |
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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 <[email protected]> |
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* Copyright 2009, 2010, Christian Lamparter <[email protected]> |
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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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|
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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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|
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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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|
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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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|
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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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|
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wiphy_info(ar->hw->wiphy, "FW: %.*s\n", len, buf); |
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|
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if (restart) |
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carl9170_restart(ar, reason); |
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} |
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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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|
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ps = le32_to_cpu(rsp->psm.state); |
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|
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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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|
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ar->ps.last_action = jiffies; |
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|
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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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/* |
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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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/* |
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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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|
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count = (seq - ar->cmd_seq) % ar->fw.cmd_bufs; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return; |
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} |
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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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|
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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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|
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return; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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break; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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case CARL9170_RSP_RADAR: |
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if (!net_ratelimit()) |
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break; |
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|
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wiphy_info(ar->hw->wiphy, "FW: RADAR! Please report this " |
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"incident to [email protected] !\n"); |
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break; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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->enc_flags |= RX_ENC_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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|
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return -EINVAL; |
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} |
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break; |
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|
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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 == NL80211_BAND_2GHZ) |
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status->rate_idx += 4; |
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break; |
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|
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case AR9170_RX_STATUS_MODULATION_HT: |
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if (head->plcp[3] & 0x80) |
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status->bw = RATE_INFO_BW_40; |
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if (head->plcp[6] & 0x80) |
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status->enc_flags |= RX_ENC_FLAG_SHORT_GI; |
|
|
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status->rate_idx = clamp(head->plcp[3] & 0x7f, 0, 75); |
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status->encoding = RX_ENC_HT; |
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break; |
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|
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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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|
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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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|
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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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/* 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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} |
|
|
|
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); |
|
if (likely(skb)) { |
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skb_reserve(skb, reserved); |
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skb_put_data(skb, buf, len); |
|
} |
|
|
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return skb; |
|
} |
|
|
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static u8 *carl9170_find_ie(u8 *data, unsigned int len, u8 ie) |
|
{ |
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struct ieee80211_mgmt *mgmt = (void *)data; |
|
u8 *pos, *end; |
|
|
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pos = (u8 *)mgmt->u.beacon.variable; |
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end = data + len; |
|
while (pos < end) { |
|
if (pos + 2 + pos[1] > end) |
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return NULL; |
|
|
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if (pos[0] == ie) |
|
return pos; |
|
|
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pos += 2 + pos[1]; |
|
} |
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return NULL; |
|
} |
|
|
|
/* |
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* NOTE: |
|
* |
|
* The firmware is in charge of waking up the device just before |
|
* the AP is expected to transmit the next beacon. |
|
* |
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* This leaves the driver with the important task of deciding when |
|
* to set the PHY back to bed again. |
|
*/ |
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static void carl9170_ps_beacon(struct ar9170 *ar, void *data, unsigned int len) |
|
{ |
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struct ieee80211_hdr *hdr = data; |
|
struct ieee80211_tim_ie *tim_ie; |
|
struct ath_common *common = &ar->common; |
|
u8 *tim; |
|
u8 tim_len; |
|
bool cam; |
|
|
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if (likely(!(ar->hw->conf.flags & IEEE80211_CONF_PS))) |
|
return; |
|
|
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/* min. beacon length + FCS_LEN */ |
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if (len <= 40 + FCS_LEN) |
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return; |
|
|
|
/* check if this really is a beacon */ |
|
/* and only beacons from the associated BSSID, please */ |
|
if (!ath_is_mybeacon(common, hdr) || !common->curaid) |
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return; |
|
|
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ar->ps.last_beacon = jiffies; |
|
|
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tim = carl9170_find_ie(data, len - FCS_LEN, WLAN_EID_TIM); |
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if (!tim) |
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return; |
|
|
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if (tim[1] < sizeof(*tim_ie)) |
|
return; |
|
|
|
tim_len = tim[1]; |
|
tim_ie = (struct ieee80211_tim_ie *) &tim[2]; |
|
|
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if (!WARN_ON_ONCE(!ar->hw->conf.ps_dtim_period)) |
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ar->ps.dtim_counter = (tim_ie->dtim_count - 1) % |
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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; |
|
} |
|
fallthrough; |
|
|
|
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(); |
|
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; |
|
} |
|
} |
|
|
|
skb_put_data(ar->rx_failover, 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. |
|
*/ |
|
|
|
skb_put_data(ar->rx_failover, 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); |
|
}
|
|
|