From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: 8139cp: set ring address before enabling receiver Date: Wed, 21 Nov 2012 16:57:22 +0000 Message-ID: <1353517042.26346.130.camel@shinybook.infradead.org> References: <20120602235020.2C0A57C006C@ra.kernel.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-UzUVJzKvzZoMoPQlQ/HU" Cc: "David S. Miller" , netdev@vger.kernel.org, Jeff Garzik To: Jason Wang Return-path: Received: from merlin.infradead.org ([205.233.59.134]:43258 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755335Ab2KUQ53 (ORCPT ); Wed, 21 Nov 2012 11:57:29 -0500 In-Reply-To: <20120602235020.2C0A57C006C@ra.kernel.org> Sender: netdev-owner@vger.kernel.org List-ID: --=-UzUVJzKvzZoMoPQlQ/HU Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2012-06-02 at 23:50 +0000, Linux Kernel Mailing List wrote: > Gitweb: http://git.kernel.org/linus/;a=3Dcommit;h=3Db01af4579ec41f48e= 9b9c774e70bd6474ad210db > Commit: b01af4579ec41f48e9b9c774e70bd6474ad210db > Parent: 20e2a86485967c385d7c7befc1646e4d1d39362e > Author: Jason Wang > AuthorDate: Thu May 31 18:19:39 2012 +0000 > Committer: David S. Miller > CommitDate: Fri Jun 1 14:22:11 2012 -0400 >=20 > 8139cp: set ring address before enabling receiver > =20 > Currently, we enable the receiver before setting the ring address whi= ch could > lead the card DMA into unexpected areas. Solving this by set the ring= address > before enabling the receiver. > =20 > btw. I find and test this in qemu as I didn't have a 8139cp card in h= and. please > review it carefully. > =20 > Signed-off-by: Jason Wang > Signed-off-by: David S. Miller This commit appears to break Ethernet on my Traverse Geos router. With OpenWRT and 3.6.6 I get: [ 124.068359] NETDEV WATCHDOG: eth1 (8139cp): transmit queue 0 timed out = =20 ... =20 [ 124.260614] 8139cp 0000:00:0b.0: eth1: Transmit timeout, status c 2b = 1 80ac = =20 If I add code to *read* the *RingAddr registers, at the later point in cp_init_hw() that they *used* to be set, I get the following: [ 1126.909193] HiTxRingAddr 0000000000000000 (should be 0) = =20 [ 1126.913880] RxRingAddr 000000000f1e5000 (sb f1e5000) = =20 [ 1126.919018] TxRingAddr 000000000f344400 (sb f1e5400)=20 Adding further debugging indicates that it's being changed in cp_start_hw(), at the line which writes the CpCmd register. These two outputs are from the surrounding lines... [ 1331.650579] at line 960 TxRingAddr 000000000f3c6400 (sb f3c6400) = =20 [ 1331.656820] at line 962 TxRingAddr 000000000f3e4400 (sb f3c6400) =20 The devices are: 00:0a.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL-813= 9/8139C/8139C+ [10ec:8139] (rev 20) = =20 00:0b.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL-813= 9/8139C/8139C+ [10ec:8139] (rev 20) =20 The other one (eth0) isn't connected, which is why I only see the errors from eth1. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-UzUVJzKvzZoMoPQlQ/HU Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUbjCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN 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