From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH net 2/2] 8139cp: reset BQL when ring tx ring cleared Date: Thu, 17 Sep 2015 16:06:31 +0100 Message-ID: <1442502391.131189.160.camel@infradead.org> References: <20130520095443.2d18b2cb@nehalam.linuxnetplumber.net> <20130520213728.GA28252@electric-eye.fr.zoreil.com> <20130520172749.2a4447b6@nehalam.linuxnetplumber.net> <1442232308.30875.6.camel@infradead.org> <20150914215913.GA24962@electric-eye.fr.zoreil.com> <1442489793.131189.142.camel@infradead.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-cn5924WV38pmJA5m5p8g" Cc: Stephen Hemminger , David Miller , netdev@vger.kernel.org To: Francois Romieu Return-path: Received: from casper.infradead.org ([85.118.1.10]:34380 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751477AbbIQPIM (ORCPT ); Thu, 17 Sep 2015 11:08:12 -0400 In-Reply-To: <1442489793.131189.142.camel@infradead.org> Sender: netdev-owner@vger.kernel.org List-ID: --=-cn5924WV38pmJA5m5p8g Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2015-09-17 at 12:36 +0100, David Woodhouse wrote: >=20 > Thanks; I'll try that. In fact since updating to 4.2 the problem has > got worse =E2=80=94 now the whole machine dies: There is something very strange going on here. I've found two ways to make it stop crashing when cp_tx_timeout() hits the 'popf' when unlocking the spinlock. The first is to comment out the whole of cp_tx_timeout() and let it happen once. Then put that code *back* again and reload the module. Then it can work fine. The second way is to comment out the WARN_ONCE in dev_watchdog(). I remain utterly bemused; I have no idea what's going on there. But that aside, even when it survives running cp_tx_timeout(), it still doesn't *work* =E2=80=94 it looks like TX is indeed working and has recover= ed, but we are not *receiving* any packets. I can't actually trigger the TX timeout at all with debugging enabled; I've hacked things so that cp_set_wol() will also call cp_tx_timeout() and simulate it. And now I see this... [ 4358.499474] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.499488] 8139cp 0000:00:0b.0 eth1: tx done, slot 35 [ 4358.513663] 8139cp 0000:00:0b.0 eth1: tx queued, slot 37, skblen 54 [ 4358.513692] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.513705] 8139cp 0000:00:0b.0 eth1: tx done, slot 36 [ 4358.518880] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b [ 4358.518900] 8139cp 0000:00:0b.0 eth1: rx slot 1 status 0x32014040 len 60 [ 4358.523601] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b [ 4358.526910] 8139cp 0000:00:0b.0 eth1: rx slot 2 status 0x32036052 len 78 [ 4358.547898] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b [ 4358.547996] 8139cp 0000:00:0b.0 eth1: rx slot 3 status 0x32036052 len 78 [ 4358.580526] 8139cp 0000:00:0b.0 eth1: tx queued, slot 38, skblen 70 [ 4358.580555] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.580569] 8139cp 0000:00:0b.0 eth1: tx done, slot 37 [ 4358.601912] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b [ 4358.601932] 8139cp 0000:00:0b.0 eth1: rx slot 4 status 0x32036052 len 78 [ 4358.650678] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b [ 4358.650698] 8139cp 0000:00:0b.0 eth1: rx slot 5 status 0x320145a5 len 14= 41 [ 4358.665572] will lock... [ 4358.668222] Handling tx timeout, flags 282 [ 4358.672494] nway_reset [ 4358.674858] Will wake queue... [ 4358.677919] Will unlock... flags 282 [ 4358.681525] did unlock... [ 4358.684198] 8139cp 0000:00:0b.0 eth1: Transmit timeout handled, status = c 2b 0 80ff [ 4358.708234] 8139cp 0000:00:0b.0 eth1: tx queued, slot 1, skblen 92 [ 4358.714567] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.722405] 8139cp 0000:00:0b.0 eth1: tx done, slot 0 [ 4358.747412] 8139cp 0000:00:0b.0 eth1: tx queued, slot 2, skblen 106 [ 4358.753736] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.756824] 8139cp 0000:00:0b.0 eth1: tx done, slot 1 [ 4358.814961] 8139cp 0000:00:0b.0 eth1: tx queued, slot 3, skblen 173 [ 4358.821291] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.824186] 8139cp 0000:00:0b.0 eth1: tx done, slot 2 [ 4358.834352] 8139cp 0000:00:0b.0 eth1: tx queued, slot 4, skblen 86 [ 4358.840579] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.844216] 8139cp 0000:00:0b.0 eth1: tx done, slot 3 [ 4358.853615] 8139cp 0000:00:0b.0 eth1: tx queued, slot 5, skblen 54 [ 4358.859822] 8139cp 0000:00:0b.0 eth1: intr, status 0484 enable 80ff cmd = 0c cpcmd 002b [ 4358.863497] 8139cp 0000:00:0b.0 eth1: tx done, slot 4 [ 4358.873111] 8139cp 0000:00:0b.0 eth1: tx queued, slot 6, skblen 66 --=20 --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-cn5924WV38pmJA5m5p8g Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN 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