From: David Woodhouse <dwmw2@infradead.org>
To: Jason Wang <jasowang@redhat.com>, netdev <netdev@vger.kernel.org>
Cc: "Eugenio Pérez" <eperezma@redhat.com>
Subject: Re: [PATCH] net: tun: fix tun_xdp_one() for IFF_TUN mode
Date: Tue, 22 Jun 2021 09:10:03 +0100 [thread overview]
Message-ID: <C196C9BC-7D51-4FE4-8E68-3C9958C5A858@infradead.org> (raw)
In-Reply-To: <ca2e6445-2ac7-7de1-bf3c-af000cb1739a@redhat.com>
On 22 June 2021 08:51:43 BST, Jason Wang <jasowang@redhat.com> wrote:
>
>在 2021/6/22 下午3:24, David Woodhouse 写道:
>> On Tue, 2021-06-22 at 12:52 +0800, Jason Wang wrote:
>>>
>>> I cook two patches. Please see and check if they fix the problem.
>>> (compile test only for me).
>> I did the second one slightly differently (below) but those are what
>I
>> came up with too, which seems to be working.
>>
>> @@ -2331,7 +2344,7 @@ static int tun_xdp_one(struct tun_struct *tun,
>> {
>> unsigned int datasize = xdp->data_end - xdp->data;
>> struct tun_xdp_hdr *hdr = xdp->data_hard_start;
>> - struct virtio_net_hdr *gso = &hdr->gso;
>> + struct virtio_net_hdr *gso = NULL;
>> struct bpf_prog *xdp_prog;
>> struct sk_buff *skb = NULL;
>> u32 rxhash = 0, act;
>> @@ -2340,9 +2353,12 @@ static int tun_xdp_one(struct tun_struct *tun,
>> bool skb_xdp = false;
>> struct page *page;
>>
>> + if (tun->flags & IFF_VNET_HDR)
>> + gso = &hdr->gso;
>> +
>> xdp_prog = rcu_dereference(tun->xdp_prog);
>> if (xdp_prog) {
>> - if (gso->gso_type) {
>> + if (gso && gso->gso_type) {
>> skb_xdp = true;
>> goto build;
>> }
>> @@ -2388,14 +2406,18 @@ static int tun_xdp_one(struct tun_struct
>*tun,
>> skb_reserve(skb, xdp->data - xdp->data_hard_start);
>> skb_put(skb, xdp->data_end - xdp->data);
>>
>> - if (virtio_net_hdr_to_skb(skb, gso,
>tun_is_little_endian(tun))) {
>> + if (!gso)
>> + skb_reset_mac_header(skb);
>> + else if (virtio_net_hdr_to_skb(skb, gso,
>tun_is_little_endian(tun))) {
>> atomic_long_inc(&tun->rx_frame_errors);
>> kfree_skb(skb);
>
>
>This should work as well.
I'll rip out the rest of my debugging hacks and check that these two are sufficient, and that I hadn't accidentally papered over something else as I debugged it.
Then I'll look at the case of having no virtio_net_hdr on either side, and also different sized headers on the tun device (why does it even support that?).
And the test case, of course.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
next prev parent reply other threads:[~2021-06-22 8:10 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-19 13:33 [PATCH] net: tun: fix tun_xdp_one() for IFF_TUN mode David Woodhouse
2021-06-21 7:00 ` Jason Wang
2021-06-21 10:52 ` David Woodhouse
2021-06-21 14:50 ` David Woodhouse
2021-06-21 20:43 ` David Woodhouse
2021-06-22 4:52 ` Jason Wang
2021-06-22 7:24 ` David Woodhouse
2021-06-22 7:51 ` Jason Wang
2021-06-22 8:10 ` David Woodhouse [this message]
2021-06-22 11:36 ` David Woodhouse
2021-06-22 4:34 ` Jason Wang
2021-06-22 4:34 ` Jason Wang
2021-06-22 7:28 ` David Woodhouse
2021-06-22 8:00 ` Jason Wang
2021-06-22 8:29 ` David Woodhouse
2021-06-23 3:39 ` Jason Wang
2021-06-24 12:39 ` David Woodhouse
2021-06-22 16:15 ` [PATCH v2 1/4] " David Woodhouse
2021-06-22 16:15 ` [PATCH v2 2/4] net: tun: don't assume IFF_VNET_HDR in tun_xdp_one() tx path David Woodhouse
2021-06-23 3:46 ` Jason Wang
2021-06-22 16:15 ` [PATCH v2 3/4] vhost_net: validate virtio_net_hdr only if it exists David Woodhouse
2021-06-23 3:48 ` Jason Wang
2021-06-22 16:15 ` [PATCH v2 4/4] vhost_net: Add self test with tun device David Woodhouse
2021-06-23 4:02 ` Jason Wang
2021-06-23 16:12 ` David Woodhouse
2021-06-24 6:12 ` Jason Wang
2021-06-24 10:42 ` David Woodhouse
2021-06-25 2:55 ` Jason Wang
2021-06-25 7:54 ` David Woodhouse
2021-06-23 3:45 ` [PATCH v2 1/4] net: tun: fix tun_xdp_one() for IFF_TUN mode Jason Wang
2021-06-23 8:30 ` David Woodhouse
2021-06-23 13:52 ` David Woodhouse
2021-06-23 17:31 ` David Woodhouse
2021-06-23 22:52 ` David Woodhouse
2021-06-24 6:37 ` Jason Wang
2021-06-24 7:23 ` David Woodhouse
2021-06-24 6:18 ` Jason Wang
2021-06-24 7:05 ` David Woodhouse
2021-06-24 12:30 ` [PATCH v3 1/5] net: add header len parameter to tun_get_socket(), tap_get_socket() David Woodhouse
2021-06-24 12:30 ` [PATCH v3 2/5] net: tun: don't assume IFF_VNET_HDR in tun_xdp_one() tx path David Woodhouse
2021-06-25 6:58 ` Jason Wang
2021-06-24 12:30 ` [PATCH v3 3/5] vhost_net: remove virtio_net_hdr validation, let tun/tap do it themselves David Woodhouse
2021-06-25 7:33 ` Jason Wang
2021-06-25 8:37 ` David Woodhouse
2021-06-28 4:23 ` Jason Wang
2021-06-28 11:23 ` David Woodhouse
2021-06-28 23:29 ` David Woodhouse
2021-06-29 3:43 ` Jason Wang
2021-06-29 6:59 ` David Woodhouse
2021-06-29 10:49 ` David Woodhouse
2021-06-29 13:15 ` David Woodhouse
2021-06-30 4:39 ` Jason Wang
2021-06-30 10:02 ` David Woodhouse
2021-07-01 4:13 ` Jason Wang
2021-07-01 17:39 ` David Woodhouse
2021-07-02 3:13 ` Jason Wang
2021-07-02 8:08 ` David Woodhouse
2021-07-02 8:50 ` Jason Wang
2021-07-09 15:04 ` Eugenio Perez Martin
2021-06-29 3:21 ` Jason Wang
2021-06-24 12:30 ` [PATCH v3 4/5] net: tun: fix tun_xdp_one() for IFF_TUN mode David Woodhouse
2021-06-25 7:41 ` Jason Wang
2021-06-25 8:51 ` David Woodhouse
2021-06-28 4:27 ` Jason Wang
2021-06-28 10:43 ` David Woodhouse
2021-06-25 18:43 ` Willem de Bruijn
2021-06-25 19:00 ` David Woodhouse
2021-06-24 12:30 ` [PATCH v3 5/5] vhost_net: Add self test with tun device David Woodhouse
2021-06-25 5:00 ` [PATCH v3 1/5] net: add header len parameter to tun_get_socket(), tap_get_socket() Jason Wang
2021-06-25 8:23 ` David Woodhouse
2021-06-28 4:22 ` Jason Wang
2021-06-25 18:13 ` Willem de Bruijn
2021-06-25 18:55 ` David Woodhouse
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