From: David Ahern <dsahern@gmail.com>
To: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: David Ahern <dsahern@kernel.org>,
Network Development <netdev@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Prashant Bhole <prashantbhole.linux@gmail.com>,
Jason Wang <jasowang@redhat.com>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Toshiaki Makita <toshiaki.makita1@gmail.com>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
David Ahern <dahern@digitalocean.com>
Subject: Re: [PATCH bpf-next 04/16] net: Add BPF_XDP_EGRESS as a bpf_attach_type
Date: Thu, 23 Apr 2020 18:58:12 -0600 [thread overview]
Message-ID: <92f6d75c-3d31-f93d-b081-c5897550ec2b@gmail.com> (raw)
In-Reply-To: <20200424005308.kguqn53qti26uvp6@ast-mbp.dhcp.thefacebook.com>
On 4/23/20 6:53 PM, Alexei Starovoitov wrote:
>
> I think the issue is not related to xdp egress.
It isn't; that has been my point all along.
> Hence I'd like to push the fix along with selftest into bpf tree.
> The selftest can be:
> void noinline do_bind((struct bpf_sock_addr *ctx)
> {
> struct sockaddr_in sa = {};
>
> bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa));
> return 0;
> }
> SEC("cgroup/connect4")
> int connect_v4_prog(struct bpf_sock_addr *ctx)
> {
> return do_bind(ctx);
> }
>
> and freplace would replace do_bind() with do_new_bind()
> that also calls bpf_bind().
> I think without the fix freplace will fail to load, because
> availability of bpf_bind() depends on correct prog->expected_attach_type.
>
> I haven't looked at the crash you mentioned in the other email related
> to xdp egress set. That could be different issue. I hope it's the same thing :)
>
it is. The replaced program is accessing ingress_ifindex from xdp egress
context, and Rx stuff is not set (access is blocked by verifier).
next prev parent reply other threads:[~2020-04-24 0:58 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-20 20:00 [PATCH bpf-next 00/16] net: Add support for XDP in egress path David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 01/16] net: Refactor convert_to_xdp_frame David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 02/16] net: Move handling of IFLA_XDP attribute out of do_setlink David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 03/16] net: Add XDP setup and query commands for Tx programs David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 04/16] net: Add BPF_XDP_EGRESS as a bpf_attach_type David Ahern
2020-04-21 10:14 ` Toke Høiland-Jørgensen
2020-04-21 12:50 ` David Ahern
2020-04-21 13:25 ` Toke Høiland-Jørgensen
2020-04-21 13:49 ` David Ahern
2020-04-22 11:21 ` Toke Høiland-Jørgensen
2020-04-22 14:51 ` David Ahern
2020-04-22 15:27 ` Toke Høiland-Jørgensen
2020-04-22 15:33 ` David Ahern
2020-04-22 15:51 ` Toke Høiland-Jørgensen
2020-04-22 15:56 ` David Ahern
2020-04-23 15:23 ` Toke Høiland-Jørgensen
2020-04-23 0:39 ` Alexei Starovoitov
2020-04-23 16:40 ` Toke Høiland-Jørgensen
2020-04-23 16:52 ` Alexei Starovoitov
2020-04-23 17:05 ` Toke Høiland-Jørgensen
2020-04-23 22:44 ` Alexei Starovoitov
2020-04-23 23:49 ` Toke Høiland-Jørgensen
2020-04-24 0:53 ` Alexei Starovoitov
2020-04-24 0:58 ` David Ahern [this message]
2020-04-24 8:55 ` Toke Høiland-Jørgensen
2020-04-20 20:00 ` [PATCH bpf-next 05/16] xdp: Add xdp_txq_info to xdp_buff David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 06/16] net: Add IFLA_XDP_EGRESS for XDP programs in the egress path David Ahern
2020-04-21 10:17 ` Toke Høiland-Jørgensen
2020-04-21 12:59 ` David Ahern
2020-04-21 13:27 ` Toke Høiland-Jørgensen
2020-04-20 20:00 ` [PATCH bpf-next 07/16] net: Rename do_xdp_generic to do_xdp_generic_rx David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 08/16] net: rename netif_receive_generic_xdp to do_generic_xdp_core David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 09/16] net: set XDP egress program on netdevice David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 10/16] net: Support xdp in the Tx path for packets as an skb David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 11/16] net: Support xdp in the Tx path for xdp_frames David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 12/16] libbpf: Add egress XDP support David Ahern
2020-04-21 10:20 ` Toke Høiland-Jørgensen
2020-04-21 13:03 ` David Ahern
2020-04-21 13:28 ` Toke Høiland-Jørgensen
2020-04-23 1:19 ` Andrii Nakryiko
2020-04-23 1:33 ` David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 13/16] bpftool: Add support for XDP egress David Ahern
2020-04-23 10:43 ` Quentin Monnet
2020-04-23 18:50 ` David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 14/16] selftest: Add test for xdp_egress David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 15/16] selftest: Add xdp_egress attach tests David Ahern
2020-04-20 20:00 ` [PATCH bpf-next 16/16] samples/bpf: add XDP egress support to xdp1 David Ahern
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