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From: Jan Beulich <jbeulich@suse.com>
To: paul@xen.org
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	Wei Liu <wl@xen.org>
Subject: Re: [PATCH] xen-netback: correct success/error reporting for the SKB-with-fraglist case
Date: Thu, 25 Feb 2021 08:33:41 +0100	[thread overview]
Message-ID: <76c94541-21a8-7ae5-c4c4-48552f16c3fd@suse.com> (raw)
In-Reply-To: <67bc0728-761b-c3dd-bdd5-1a850ff79fbb@xen.org>

On 24.02.2021 17:39, Paul Durrant wrote:
> On 23/02/2021 16:29, Jan Beulich wrote:
>> When re-entering the main loop of xenvif_tx_check_gop() a 2nd time, the
>> special considerations for the head of the SKB no longer apply. Don't
>> mistakenly report ERROR to the frontend for the first entry in the list,
>> even if - from all I can tell - this shouldn't matter much as the overall
>> transmit will need to be considered failed anyway.
>>
>> Signed-off-by: Jan Beulich <jbeulich@suse.com>
>>
>> --- a/drivers/net/xen-netback/netback.c
>> +++ b/drivers/net/xen-netback/netback.c
>> @@ -499,7 +499,7 @@ check_frags:
>>   				 * the header's copy failed, and they are
>>   				 * sharing a slot, send an error
>>   				 */
>> -				if (i == 0 && sharedslot)
>> +				if (i == 0 && !first_shinfo && sharedslot)
>>   					xenvif_idx_release(queue, pending_idx,
>>   							   XEN_NETIF_RSP_ERROR);
>>   				else
>>
> 
> I think this will DTRT, but to my mind it would make more sense to clear 
> 'sharedslot' before the 'goto check_frags' at the bottom of the function.

That was my initial idea as well, but
- I think it is for a reason that the variable is "const".
- There is another use of it which would then instead need further
  amending (and which I believe is at least part of the reason for
  the variable to be "const").

Jan

  reply	other threads:[~2021-02-25  7:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 16:29 Jan Beulich
2021-02-24 16:39 ` Paul Durrant
2021-02-25  7:33   ` Jan Beulich [this message]
2021-02-25 12:11     ` Paul Durrant
2021-02-25 14:00       ` Jan Beulich
2021-02-25 16:23         ` Paul Durrant
2021-05-20 11:46           ` Jan Beulich
2021-07-15  8:58             ` Ping: " Jan Beulich
2021-09-16 15:45               ` Ping²: " Jan Beulich
2021-09-16 18:34                 ` Paul Durrant
2021-09-16 21:48                   ` Sander Eikelenboom
2021-09-17  6:21                     ` Jan Beulich

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