From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Hangbin Liu <liuhangbin@gmail.com>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
"Daniel Borkmann" <daniel@iogearbox.net>,
"John Fastabend" <john.fastabend@gmail.com>,
"Yonghong Song" <yhs@fb.com>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
brouer@redhat.com
Subject: Re: [PATCHv9 bpf-next] samples/bpf: add xdp program on egress for xdp_redirect_map
Date: Thu, 21 Jan 2021 16:05:38 +0100 [thread overview]
Message-ID: <20210121160538.192ca297@carbon> (raw)
In-Reply-To: <20210121130642.2943811-1-liuhangbin@gmail.com>
On Thu, 21 Jan 2021 21:06:42 +0800
Hangbin Liu <liuhangbin@gmail.com> wrote:
> This patch add a xdp program on egress to show that we can modify
> the packet on egress. In this sample we will set the pkt's src
> mac to egress's mac address. The xdp_prog will be attached when
> -X option supplied.
>
> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
>
> ---
> v9:
> roll back to just set src mac to egress interface mac on 2nd xdp prog,
> this could avoid packet reorder introduce in patch v6.
I like this V9 much better.
One (hopefully) last nitpick below.
> diff --git a/samples/bpf/xdp_redirect_map_kern.c b/samples/bpf/xdp_redirect_map_kern.c
> index 6489352ab7a4..35ce5e26bbe5 100644
> --- a/samples/bpf/xdp_redirect_map_kern.c
> +++ b/samples/bpf/xdp_redirect_map_kern.c
> -SEC("xdp_redirect_map")
> -int xdp_redirect_map_prog(struct xdp_md *ctx)
> +static int xdp_redirect_map(struct xdp_md *ctx, void *redirect_map)
Can you make this function always inline?
> {
> void *data_end = (void *)(long)ctx->data_end;
> void *data = (void *)(long)ctx->data;
> struct ethhdr *eth = data;
> int rc = XDP_DROP;
> - int vport, port = 0, m = 0;
> long *value;
> u32 key = 0;
> u64 nh_off;
> + int vport;
>
> nh_off = sizeof(*eth);
> if (data + nh_off > data_end)
> @@ -79,7 +96,40 @@ int xdp_redirect_map_prog(struct xdp_md *ctx)
> swap_src_dst_mac(data);
>
> /* send packet out physical port */
> - return bpf_redirect_map(&tx_port, vport, 0);
> + return bpf_redirect_map(redirect_map, vport, 0);
> +}
> +
> +SEC("xdp_redirect_general")
> +int xdp_redirect_map_general(struct xdp_md *ctx)
> +{
> + return xdp_redirect_map(ctx, &tx_port_general);
> +}
> +
> +SEC("xdp_redirect_native")
> +int xdp_redirect_map_native(struct xdp_md *ctx)
> +{
> + return xdp_redirect_map(ctx, &tx_port_native);
> +}
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
next prev parent reply other threads:[~2021-01-21 15:09 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 12:46 [PATCH bpf-next] samples/bpf: add xdp_redirect_map with xdp_prog support Hangbin Liu
2020-11-10 14:25 ` Jesper Dangaard Brouer
2020-11-10 15:24 ` Maciej Fijalkowski
2020-11-11 1:12 ` Hangbin Liu
2020-11-26 8:43 ` [PATCHv2 bpf-next] samples/bpf: add xdp program on egress for xdp_redirect_map Hangbin Liu
2020-11-26 10:51 ` Jesper Dangaard Brouer
2020-11-26 14:19 ` Hangbin Liu
2020-11-27 6:31 ` Yonghong Song
2020-11-30 7:51 ` Hangbin Liu
2020-11-30 9:32 ` Jesper Dangaard Brouer
2020-11-30 13:10 ` Hangbin Liu
2020-11-30 15:12 ` Jesper Dangaard Brouer
2020-11-30 16:07 ` Toke Høiland-Jørgensen
2020-12-08 8:18 ` [PATCHv3 " Hangbin Liu
2020-12-08 10:39 ` Jesper Dangaard Brouer
2020-12-08 11:11 ` Hangbin Liu
2020-12-08 12:01 ` [PATCHv4 " Hangbin Liu
2020-12-11 0:15 ` Daniel Borkmann
2020-12-11 2:40 ` [PATCHv5 " Hangbin Liu
2021-01-14 14:27 ` [PATCHv6 " Hangbin Liu
2021-01-14 21:01 ` Yonghong Song
2021-01-15 4:17 ` Hangbin Liu
2021-01-15 6:24 ` [PATCHv7 " Hangbin Liu
2021-01-15 16:57 ` Yonghong Song
2021-01-18 22:46 ` Daniel Borkmann
2021-01-19 3:12 ` [PATCHv8 " Hangbin Liu
2021-01-19 14:51 ` Jesper Dangaard Brouer
2021-01-20 4:16 ` Hangbin Liu
2021-01-21 13:06 ` [PATCHv9 " Hangbin Liu
2021-01-21 15:05 ` Jesper Dangaard Brouer [this message]
2021-01-22 2:50 ` [PATCHv10 " Hangbin Liu
2021-01-22 10:32 ` Jesper Dangaard Brouer
2021-01-22 23:30 ` patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210121160538.192ca297@carbon \
--to=brouer@redhat.com \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=john.fastabend@gmail.com \
--cc=liuhangbin@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=toke@redhat.com \
--cc=yhs@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).