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Date:	Sat, 07 Dec 2013 11:05:02 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jason Wang <jasowang@...hat.com>, Andrey Vagin <avagin@...nvz.org>,
	virtualization@...ts.linux-foundation.org
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Michael Dalton <mwdalton@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH 1/2] virtio-net: determine type of bufs correctly

Jason Wang <jasowang@...hat.com> writes:
> On 12/05/2013 10:36 PM, Andrey Vagin wrote:
>> free_unused_bufs must check vi->mergeable_rx_bufs before
>> vi->big_packets, because we use this sequence in other places.
>> Otherwise we allocate buffer of one type, then free it as another
>> type.
>>
>> general protection fault: 0000 [#1] SMP
>> Dumping ftrace buffer:
>>    (ftrace buffer empty)
>> Modules linked in: ip6table_filter ip6_tables iptable_filter ip_tables pcspkr virtio_balloon virtio_net(-) i2c_pii
>> CPU: 0 PID: 400 Comm: rmmod Not tainted 3.13.0-rc2+ #170
>> Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
>> task: ffff8800b6d2a210 ti: ffff8800aed32000 task.ti: ffff8800aed32000
>> RIP: 0010:[<ffffffffa00345f3>]  [<ffffffffa00345f3>] free_unused_bufs+0xc3/0x190 [virtio_net]
>> RSP: 0018:ffff8800aed33dd8  EFLAGS: 00010202
>> RAX: ffff8800b1fe2c00 RBX: ffff8800b66a7240 RCX: 6b6b6b6b6b6b6b6b
>> RDX: 6b6b6b6b6b6b6b6b RSI: ffff8800b8419a68 RDI: ffff8800b66a1148
>> RBP: ffff8800aed33e00 R08: 0000000000000001 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
>> R13: ffff8800b66a1148 R14: 0000000000000000 R15: 000077ff80000000
>> FS:  00007fc4f9c4e740(0000) GS:ffff8800bfa00000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>> CR2: 00007f63f432f000 CR3: 00000000b6538000 CR4: 00000000000006f0
>> Stack:
>>  ffff8800b66a7240 ffff8800b66a7380 ffff8800377bd3f0 0000000000000000
>>  00000000023302f0 ffff8800aed33e18 ffffffffa00346e2 ffff8800b66a7240
>>  ffff8800aed33e38 ffffffffa003474d ffff8800377bd388 ffff8800377bd390
>> Call Trace:
>>  [<ffffffffa00346e2>] remove_vq_common+0x22/0x40 [virtio_net]
>>  [<ffffffffa003474d>] virtnet_remove+0x4d/0x90 [virtio_net]
>>  [<ffffffff813ae303>] virtio_dev_remove+0x23/0x80
>>  [<ffffffff813f62cf>] __device_release_driver+0x7f/0xf0
>>  [<ffffffff813f6c80>] driver_detach+0xc0/0xd0
>>  [<ffffffff813f5f08>] bus_remove_driver+0x58/0xd0
>>  [<ffffffff813f72cc>] driver_unregister+0x2c/0x50
>>  [<ffffffff813ae63e>] unregister_virtio_driver+0xe/0x10
>>  [<ffffffffa0036852>] virtio_net_driver_exit+0x10/0x7be [virtio_net]
>>  [<ffffffff810d7cf2>] SyS_delete_module+0x172/0x220
>>  [<ffffffff810a732d>] ? trace_hardirqs_on+0xd/0x10
>>  [<ffffffff810f5d4c>] ? __audit_syscall_entry+0x9c/0xf0
>>  [<ffffffff81677f69>] system_call_fastpath+0x16/0x1b
>> Code: c0 74 55 0f 1f 44 00 00 80 7b 30 00 74 7a 48 8b 50 30 4c 89 e6 48 03 73 20 48 85 d2 0f 84 bb 00 00 00 66 0f
>> RIP  [<ffffffffa00345f3>] free_unused_bufs+0xc3/0x190 [virtio_net]
>>  RSP <ffff8800aed33dd8>
>> ---[ end trace edb570ea923cce9c ]---
>>
>> Fixes: 2613af0ed18a (virtio_net: migrate mergeable rx buffers to page frag allocators)
>> Cc: Michael Dalton <mwdalton@...gle.com>
>> Cc: Rusty Russell <rusty@...tcorp.com.au>
>> Cc: "Michael S. Tsirkin" <mst@...hat.com>
>> Signed-off-by: Andrey Vagin <avagin@...nvz.org>
>> ---
>>  drivers/net/virtio_net.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
>> index 916241d..930039a 100644
>> --- a/drivers/net/virtio_net.c
>> +++ b/drivers/net/virtio_net.c
>> @@ -1396,10 +1396,10 @@ static void free_unused_bufs(struct virtnet_info *vi)
>>  		struct virtqueue *vq = vi->rq[i].vq;
>>  
>>  		while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
>> -			if (vi->big_packets)
>> -				give_pages(&vi->rq[i], buf);
>> -			else if (vi->mergeable_rx_bufs)
>> +			if (vi->mergeable_rx_bufs)
>>  				put_page(virt_to_head_page(buf));
>> +			else if (vi->big_packets)
>> +				give_pages(&vi->rq[i], buf);
>>  			else
>>  				dev_kfree_skb(buf);
>>  			--vi->rq[i].num;
>
> Acked-by: Jason Wang <jasowang@...hat.com>

Acked-by: Rusty Russell <rusty@...tcorp.com.au>

Dave, please apply.

Thanks,
Rusty.
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