1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
From patchwork Wed Jul 3 08:10:49 2019
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: Luca Coelho <luca@coelho.fi>
X-Patchwork-Id: 11029027
X-Patchwork-Delegate: kvalo@adurom.com
Return-Path: <linux-wireless-owner@kernel.org>
Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org
[172.30.200.125])
by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A4F061398
for <patchwork-linux-wireless@patchwork.kernel.org>;
Wed, 3 Jul 2019 08:11:03 +0000 (UTC)
Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1])
by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 93D7228807
for <patchwork-linux-wireless@patchwork.kernel.org>;
Wed, 3 Jul 2019 08:11:03 +0000 (UTC)
Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486)
id 82C5C28786; Wed, 3 Jul 2019 08:11:03 +0000 (UTC)
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
pdx-wl-mail.web.codeaurora.org
X-Spam-Level:
X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI,
RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1
Received: from vger.kernel.org (vger.kernel.org [209.132.180.67])
by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0A56D28786
for <patchwork-linux-wireless@patchwork.kernel.org>;
Wed, 3 Jul 2019 08:11:03 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
id S1727179AbfGCILC (ORCPT
<rfc822;patchwork-linux-wireless@patchwork.kernel.org>);
Wed, 3 Jul 2019 04:11:02 -0400
Received: from paleale.coelho.fi ([176.9.41.70]:54844 "EHLO
farmhouse.coelho.fi" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org
with ESMTP id S1727052AbfGCILC (ORCPT
<rfc822;linux-wireless@vger.kernel.org>);
Wed, 3 Jul 2019 04:11:02 -0400
Received: from 91-156-6-193.elisa-laajakaista.fi ([91.156.6.193]
helo=redipa.ger.corp.intel.com)
by farmhouse.coelho.fi with esmtpsa
(TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256)
(Exim 4.92)
(envelope-from <luca@coelho.fi>)
id 1hiaLv-0004w3-Ei; Wed, 03 Jul 2019 11:10:55 +0300
From: Luca Coelho <luca@coelho.fi>
To: davem@davemloft.net
Cc: kvalo@codeaurora.org, linux-wireless@vger.kernel.org,
emmanuel.grumbach@intel.com, johannes.hirte@datenkhaos.de,
steven@uplinklabs.net, Johannes Berg <johannes.berg@intel.com>,
Luca Coelho <luciano.coelho@intel.com>
Subject: [PATCH for v5.2] iwlwifi: mvm: disable TX-AMSDU on older NICs
Date: Wed, 3 Jul 2019 11:10:49 +0300
Message-Id: <20190703081049.28831-1-luca@coelho.fi>
X-Mailer: git-send-email 2.20.1
MIME-Version: 1.0
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-wireless.vger.kernel.org>
X-Mailing-List: linux-wireless@vger.kernel.org
X-Virus-Scanned: ClamAV using ClamSMTP
From: Johannes Berg <johannes.berg@intel.com>
On older NICs, we occasionally see issues with A-MSDU support,
where the commands in the FIFO get confused and then we see an
assert EDC because the next command in the FIFO isn't TX.
We've tried to isolate this issue and understand where it comes
from, but haven't found any errors in building the A-MSDU in
software.
At least for now, disable A-MSDU support on older hardware so
that users can use it again without fearing the assert.
This fixes https://bugzilla.kernel.org/show_bug.cgi?id=203315.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
---
drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index fdbabca0280e..3a076e5e319f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -468,7 +468,19 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
ieee80211_hw_set(hw, SUPPORTS_VHT_EXT_NSS_BW);
ieee80211_hw_set(hw, BUFF_MMPDU_TXQ);
ieee80211_hw_set(hw, STA_MMPDU_TXQ);
- ieee80211_hw_set(hw, TX_AMSDU);
+ /*
+ * On older devices, enabling TX A-MSDU occasionally leads to
+ * something getting messed up, the command read from the FIFO
+ * gets out of sync and isn't a TX command, so that we have an
+ * assert EDC.
+ *
+ * It's not clear where the bug is, but since we didn't used to
+ * support A-MSDU until moving the mac80211 iTXQs, just leave it
+ * for older devices. We also don't see this issue on any newer
+ * devices.
+ */
+ if (mvm->cfg->device_family >= IWL_DEVICE_FAMILY_9000)
+ ieee80211_hw_set(hw, TX_AMSDU);
ieee80211_hw_set(hw, TX_FRAG_LIST);
if (iwl_mvm_has_tlc_offload(mvm)) {
|
