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 23:14:25 +0100 Message-ID: <1442528065.97487.6.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> <1442502391.131189.160.camel@infradead.org> <20150917204449.GA22105@electric-eye.fr.zoreil.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-BgTyACyTJ9nDRsOrnyO1" Cc: Stephen Hemminger , David Miller , netdev@vger.kernel.org To: Francois Romieu Return-path: Received: from casper.infradead.org ([85.118.1.10]:37789 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752370AbbIQWO3 (ORCPT ); Thu, 17 Sep 2015 18:14:29 -0400 In-Reply-To: <20150917204449.GA22105@electric-eye.fr.zoreil.com> Sender: netdev-owner@vger.kernel.org List-ID: --=-BgTyACyTJ9nDRsOrnyO1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2015-09-17 at 22:44 +0200, Francois Romieu wrote: > David Woodhouse : > > 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: > >=20 > > 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. >=20 > cp_tx_timeout takes lock, disables irq, calls cp_clean_rings, thus > plain dev_kfree_skb if a skb is still referenced in one of the > rx/tx ring. You may replace it with dev_kfree_skb_any. Well spotted; I've made that change locally. Although I don't think it explains the symptoms. Not that I'm sure what *could*. I've also found that adding a call to __cp_set_rx_mode() seems to fix the RX after reset, in some tests. Especially the simulated one via the hack in cp_set_wol(). I think that's necessary, if not sufficient =E2=80=94= at least on real hardware. I didn't see the problem at all when running in qemu. Sometimes, though, it still dies in an interrupt storm after re -enabling IRQs: [ 900.004214] 8139cp 0000:00:0b.0 eth1: Transmit timeout, status c 2b = 0 80ff [ 900.011725] will lock... [ 900.014273] Handling tx timeout, flags 200296 [ 900.018774] Will wake queue... [ 900.021645] Will unlock... flags 200296 [ 900.021645] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b [ 900.021645] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b ...=20 [ 901.628439] 8139cp 0000:00:0b.0 eth1: intr, status 0001 enable 80ff cmd = 0c cpcmd 002b [ 901.636291] 8139cp 0000:00:0b.0 eth1: intr, status 0011 enable 80ff cmd = 0c cpcmd 002b ... [ 901.966243] 8139cp 0000:00:0b.0 eth1: intr, status 0011 enable 80ff cmd = 0c cpcmd 002b [ 901.968353] 8139cp 0000:00:0b.0 eth1: intr, status 0051 enable 80ff cmd = 0c cpcmd 002b ... forever... And of course, even if I fix the TX timeout handling, I'd still like to know why it's happening in the first place... --=20 dwmw2 --=-BgTyACyTJ9nDRsOrnyO1 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 AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG doa5RY7+N4WRusWZDYW/RRWE6i9EL9qV86CVPYqw22UBOUw4/j/HVGCV6TSB8yE5iEwhk/hUuzRr 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