Re: [BUG] 3.19-rc1 net: less interrupt masking in NAPI

[Oded Gabbay]

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@odedg-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
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