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Message-ID: <54B19D10.5020408@amd.com> Date: Sat, 10 Jan 2015 23:43:44 +0200 From: Oded Gabbay <oded.gabbay@....com> To: Eric Dumazet <eric.dumazet@...il.com> CC: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Willem de Bruijn <willemb@...gle.com>, "Bridgman, John" <John.Bridgman@....com>, "Elifaz, Dana" <Dana.Elifaz@....com> Subject: Re: [BUG] 3.19-rc1 net: less interrupt masking in NAPI On 01/10/2015 11:30 PM, Oded Gabbay wrote: > > > On 01/10/2015 10:58 PM, Eric Dumazet wrote: >> On Sat, 2015-01-10 at 22:39 +0200, Oded Gabbay wrote: >>> Hi, >>> >>> Commit d75b1ade567ffab085e8adbbdacf0092d10cd09c breaks my "Qualcomm Atheros >>> AR8161 Gigabit Ethernet (rev 10)" Ethernet controller, which is handled by >>> the alx network driver. >>> >>> ogabbay@...dg-ubuntu:~$ lspci -s 01:00.0 -k >>> 01:00.0 Ethernet controller: >>> Qualcomm Atheros AR8161 Gigabit Ethernet (rev 10) >>> Subsystem: Qualcomm Atheros Device 1071 >>> Kernel driver in use: alx >>> >>> I have this controller on a mobile platform of AMD APU Kaveri, which I use >>> to test amdkfd, and from 3.19-rc1 the network stopped working when trying to >>> transfer files through scp or nfs. >>> >>> I bisected the kernel (from 3.18.0 to 3.19-rc1) and reached this commit. >>> >>> Here is the log of the bisect: >>> >>> git bisect start >>> # bad: [97bf6af1f928216fd6c5a66e8a57bfa95a659672] Linux 3.19-rc1 >>> git bisect bad 97bf6af1f928216fd6c5a66e8a57bfa95a659672 >>> >>> # good: [b2776bf7149bddd1f4161f14f79520f17fc1d71d] Linux 3.18 >>> git bisect good b2776bf7149bddd1f4161f14f79520f17fc1d71d >>> >>> # bad: [70e71ca0af244f48a5dcf56dc435243792e3a495] Merge >>> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next >>> git bisect bad 70e71ca0af244f48a5dcf56dc435243792e3a495 >>> >>> # good: [e28870f9b3e92cd3570925089c6bb789c2603bc4] Merge tag >>> 'backlight-for-linus-3.19' of >>> git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight >>> git bisect good e28870f9b3e92cd3570925089c6bb789c2603bc4 >>> >>> # bad: [450fa21942fe2c37f0c9f52d1a33bbc081eee288] sh_eth: Remove redundant >>> alignment adjustment >>> git bisect bad 450fa21942fe2c37f0c9f52d1a33bbc081eee288 >>> >>> # bad: [5c8d19da950861d0482abc0ac3481acca34b008f] e100e: use >>> netdev_rss_key_fill() helper >>> git bisect bad 5c8d19da950861d0482abc0ac3481acca34b008f >>> >>> # good: [bf515fb11ab539c76d04f0e3c5216ed41f41d81f] Merge tag >>> 'mac80211-next-for-john-2014-11-04' of >>> git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next >>> git bisect good bf515fb11ab539c76d04f0e3c5216ed41f41d81f >>> >>> # bad: [2c99cd914d4fed9160d98849c9dd38034616768e] Merge branch 'amd-xgbe-next' >>> git bisect bad 2c99cd914d4fed9160d98849c9dd38034616768e >>> >>> # good: [3d762a0f0ab9cb4a6b5993db3ce56c92f9f90ab2] net: dsa: Add support for >>> reading switch registers with ethtool >>> git bisect good 3d762a0f0ab9cb4a6b5993db3ce56c92f9f90ab2 >>> >>> # bad: [8ce0c8254f15229aa99fc6c04141f28c446e5f8c] Merge branch 'master' of >>> git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net-next >>> git bisect bad 8ce0c8254f15229aa99fc6c04141f28c446e5f8c >>> >>> # good: [f0c65567b3c1b23f79e8a49139580a3872a68d1f] Merge branch >>> 'sunvnet-multi-tx-queue' >>> git bisect good f0c65567b3c1b23f79e8a49139580a3872a68d1f >>> >>> # bad: [547f2735c20023d7b50a791b1b17cacb652e9237] Merge branch 'mlx4-next' >>> git bisect bad 547f2735c20023d7b50a791b1b17cacb652e9237 >>> >>> # good: [4cdb1e2e3d3495423db558d3bb7ed11d66aabce7] net: shrink struct >>> softnet_data >>> git bisect good 4cdb1e2e3d3495423db558d3bb7ed11d66aabce7 >>> >>> # bad: [0a98455666ec87378148a1dde97f1ce5baf75a64] net/mlx4_core: Protect >>> port type setting by mutex >>> git bisect bad 0a98455666ec87378148a1dde97f1ce5baf75a64 >>> >>> # bad: [6e8066999800d90d52af5c84ac49ebf683d14cdc] net/mlx4_core: Prevent VF >>> from changing port configuration >>> git bisect bad 6e8066999800d90d52af5c84ac49ebf683d14cdc >>> >>> # bad: [d75b1ade567ffab085e8adbbdacf0092d10cd09c] net: less interrupt >>> masking in NAPI >>> git bisect bad d75b1ade567ffab085e8adbbdacf0092d10cd09c >>> >>> # first bad commit: [d75b1ade567ffab085e8adbbdacf0092d10cd09c] >>> net: less interrupt masking in NAPI >>> >>> Could you please solve this issue as it renders my board quite useless. >>> >> >> Thanks for the report and bisection ! >> >> Could you try following fix ? >> >> diff --git a/drivers/net/ethernet/atheros/alx/main.c b/drivers/net/ethernet/atheros/alx/main.c >> index e398eda07298..209c40765e0d 100644 >> --- a/drivers/net/ethernet/atheros/alx/main.c >> +++ b/drivers/net/ethernet/atheros/alx/main.c >> @@ -272,7 +272,7 @@ static int alx_poll(struct napi_struct *napi, int budget) >> alx_clean_rx_irq(alx, budget); >> >> if (!complete) >> - return 1; >> + return budget; >> >> napi_complete(&alx->napi); >> >> >> >> >> > Yes, no problem. > I will update on the result. > > Oded > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > Hi Eric, Your patch fixed the problem. Thanks for the quick help! Oded -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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