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From: Jason Wang <jasowang@redhat.com>
To: Daniel Borkmann <daniel@iogearbox.net>,
	mst@redhat.com, virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: john.r.fastabend@intel.com
Subject: Re: [PATCH net 1/9] virtio-net: remove the warning before XDP linearizing
Date: Tue, 27 Dec 2016 11:08:34 +0800	[thread overview]
Message-ID: <cd8dfbc9-58e4-2632-2b04-9d68af68cca8@redhat.com> (raw)
In-Reply-To: <585D7BA9.50509@iogearbox.net>



On 2016年12月24日 03:31, Daniel Borkmann wrote:
> Hi Jason,
>
> On 12/23/2016 03:37 PM, Jason Wang wrote:
>> Since we use EWMA to estimate the size of rx buffer. When rx buffer
>> size is underestimated, it's usual to have a packet with more than one
>> buffers. Consider this is not a bug, remove the warning and correct
>> the comment before XDP linearizing.
>>
>> Cc: John Fastabend <john.r.fastabend@intel.com>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>>   drivers/net/virtio_net.c | 8 +-------
>>   1 file changed, 1 insertion(+), 7 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 08327e0..1067253 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -552,14 +552,8 @@ static struct sk_buff *receive_mergeable(struct 
>> net_device *dev,
>>           struct page *xdp_page;
>>           u32 act;
>>
>> -        /* No known backend devices should send packets with
>> -         * more than a single buffer when XDP conditions are
>> -         * met. However it is not strictly illegal so the case
>> -         * is handled as an exception and a warning is thrown.
>> -         */
>> +        /* This happens when rx buffer size is underestimated */
>>           if (unlikely(num_buf > 1)) {
>> -            bpf_warn_invalid_xdp_buffer();
>
> Could you also remove the bpf_warn_invalid_xdp_buffer(), which got added
> just for this?
>
> Thanks. 

Posted.

Thanks
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  parent reply	other threads:[~2016-12-27  3:08 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-23 14:37 [PATCH net 0/9] several fixups for virtio-net XDP Jason Wang
2016-12-23 14:37 ` [PATCH net 1/9] virtio-net: remove the warning before XDP linearizing Jason Wang
2016-12-23 19:31   ` Daniel Borkmann
     [not found]   ` <585D7BA9.50509@iogearbox.net>
2016-12-27  3:08     ` Jason Wang [this message]
2016-12-23 14:37 ` [PATCH net 2/9] virtio-net: correctly xmit linearized page on XDP_TX Jason Wang
2016-12-23 15:47   ` John Fastabend
2016-12-23 14:37 ` [PATCH net 3/9] virtio-net: fix page miscount during XDP linearizing Jason Wang
2016-12-23 15:54   ` John Fastabend
2016-12-26  2:30     ` Jason Wang
2016-12-23 14:37 ` [PATCH net 4/9] virtio-net: correctly handle XDP_PASS for linearized packets Jason Wang
2016-12-23 15:57   ` John Fastabend
2016-12-26  2:34     ` Jason Wang
2016-12-23 14:37 ` [PATCH net 5/9] virtio-net: unbreak csumed packets for XDP_PASS Jason Wang
2016-12-23 15:58   ` John Fastabend
2016-12-23 14:37 ` [PATCH net 6/9] virtio-net: make rx buf size estimation works for XDP Jason Wang
2016-12-23 16:02   ` John Fastabend
2016-12-23 14:37 ` [PATCH net 7/9] virtio-net: forbid XDP when VIRTIO_NET_F_GUEST_UFO is support Jason Wang
2016-12-23 16:02   ` John Fastabend
2016-12-23 16:10     ` John Fastabend
2016-12-26  2:38       ` Jason Wang
2016-12-23 14:37 ` [PATCH net 8/9] virtio-net: remove big packet XDP codes Jason Wang
2016-12-23 14:37 ` [PATCH net 9/9] virtio-net: XDP support for small buffers Jason Wang
2016-12-23 16:51   ` John Fastabend
2017-01-02 22:43   ` John Fastabend
2017-01-03  6:16     ` Jason Wang
2017-01-03 16:40       ` John Fastabend
2017-01-04  3:05         ` Jason Wang
2016-12-23 17:10 ` [PATCH net 0/9] several fixups for virtio-net XDP John Fastabend
2016-12-26  2:39   ` Jason Wang
2016-12-23 18:49 ` David Miller

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