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From: Jason Wang <jasowang@redhat.com>
To: John Fastabend <john.fastabend@gmail.com>,
	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 4/9] virtio-net: correctly handle XDP_PASS for linearized packets
Date: Mon, 26 Dec 2016 10:34:39 +0800	[thread overview]
Message-ID: <372cf0e9-a1ab-a45c-82dc-5f45af6bc7dc@redhat.com> (raw)
In-Reply-To: <585D4966.9060605@gmail.com>



On 2016年12月23日 23:57, John Fastabend wrote:
> On 16-12-23 06:37 AM, Jason Wang wrote:
>> When XDP_PASS were determined for linearized packets, we try to get
>> new buffers in the virtqueue and build skbs from them. This is wrong,
>> we should create skbs based on existed buffers instead. Fixing them by
>> creating skb based on xdp_page.
>>
>> With this patch "ping 192.168.100.4 -s 3900 -M do" works for XDP_PASS.
>>
>> Cc: John Fastabend <john.r.fastabend@intel.com>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>> ---
>>   drivers/net/virtio_net.c | 10 ++++++++--
>>   1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 58ad40e..470293e 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -578,8 +578,14 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>>   		act = do_xdp_prog(vi, rq, xdp_prog, xdp_page, offset, len);
>>   		switch (act) {
>>   		case XDP_PASS:
>> -			if (unlikely(xdp_page != page))
>> -				__free_pages(xdp_page, 0);
>> +			/* We can only create skb based on xdp_page. */
>> +			if (unlikely(xdp_page != page)) {
>> +				rcu_read_unlock();
>> +				put_page(page);
>> +				head_skb = page_to_skb(vi, rq, xdp_page,
>> +						       0, len, PAGE_SIZE);
>> +				return head_skb;
>> +			}
>>   			break;
>>   		case XDP_TX:
>>   			if (unlikely(xdp_page != page))
>>
> Great thanks. This was likely working before because of the memory
> leak fixed in 3/9.

Looks not, without this and 3/9 the code will try to get buffers and 
build skb for a new packet instead of existed buffers.

Thanks

>
> Acked-by: John Fastabend <john.r.fastabend@intel.com>

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  reply	other threads:[~2016-12-26  2:34 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
2016-12-27  3:08     ` Jason Wang
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 [this message]
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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