From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
To: Shay Agroskin <shayagr@amazon.com>
Cc: Lorenzo Bianconi <lorenzo@kernel.org>,
BPF-dev-list <bpf@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
"Jubran, Samih" <sameehj@amazon.com>,
John Fastabend <john.fastabend@gmail.com>,
David Ahern <dsahern@kernel.org>,
Jesper Brouer <brouer@redhat.com>,
Eelco Chaudron <echaudro@redhat.com>,
Jason Wang <jasowang@redhat.com>
Subject: Re: [PATCH v5 bpf-next 11/14] bpf: cpumap: introduce xdp multi-buff support
Date: Sun, 20 Dec 2020 18:56:07 +0100 [thread overview]
Message-ID: <CAJ0CqmXB2fBoUHgOcpXOkEhfV2Bp=Np+2rhKSOCaZiFdz4WZPQ@mail.gmail.com> (raw)
In-Reply-To: <pj41zleejlpu3c.fsf@u68c7b5b1d2d758.ant.amazon.com>
>
>
> Lorenzo Bianconi <lorenzo@kernel.org> writes:
>
> > Introduce __xdp_build_skb_from_frame and
> > xdp_build_skb_from_frame
> > utility routines to build the skb from xdp_frame.
> > Add xdp multi-buff support to cpumap
> >
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > ---
> > include/net/xdp.h | 5 ++++
> > kernel/bpf/cpumap.c | 45 +---------------------------
> > net/core/xdp.c | 73
> > +++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 79 insertions(+), 44 deletions(-)
> >
> [...]
> > diff --git a/net/core/xdp.c b/net/core/xdp.c
> > index 6c8e743ad03a..55f3e9c69427 100644
> > --- a/net/core/xdp.c
> > +++ b/net/core/xdp.c
> > @@ -597,3 +597,76 @@ void xdp_warn(const char *msg, const char
> > *func, const int line)
> > WARN(1, "XDP_WARN: %s(line:%d): %s\n", func, line, msg);
> > };
> > EXPORT_SYMBOL_GPL(xdp_warn);
> > +
> > +struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame
> > *xdpf,
> > + struct sk_buff *skb,
> > + struct net_device *dev)
> > +{
> > + unsigned int headroom = sizeof(*xdpf) + xdpf->headroom;
> > + void *hard_start = xdpf->data - headroom;
> > + skb_frag_t frag_list[MAX_SKB_FRAGS];
> > + struct xdp_shared_info *xdp_sinfo;
> > + int i, num_frags = 0;
> > +
> > + xdp_sinfo = xdp_get_shared_info_from_frame(xdpf);
> > + if (unlikely(xdpf->mb)) {
> > + num_frags = xdp_sinfo->nr_frags;
> > + memcpy(frag_list, xdp_sinfo->frags,
> > + sizeof(skb_frag_t) * num_frags);
> > + }
>
> nit, can you please move the xdp_sinfo assignment inside this 'if'
> ? This would help to emphasize that regarding xdp_frame tailroom
> as xdp_shared_info struct (rather than skb_shared_info) is correct
> only when the mb bit is set
>
> thanks,
> Shay
ack, will do in v6.
Regards,
Lorenzo
>
> > +
> > + skb = build_skb_around(skb, hard_start, xdpf->frame_sz);
> > + if (unlikely(!skb))
> > + return NULL;
> [...]
>
next prev parent reply other threads:[~2020-12-20 17:57 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-07 16:32 [PATCH v5 bpf-next 00/14] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 01/14] xdp: introduce mb in xdp_buff/xdp_frame Lorenzo Bianconi
2020-12-07 21:16 ` Alexander Duyck
2020-12-07 23:03 ` Saeed Mahameed
2020-12-08 3:16 ` Alexander Duyck
2020-12-08 6:49 ` Saeed Mahameed
2020-12-08 9:47 ` Jesper Dangaard Brouer
2020-12-07 16:32 ` [PATCH v5 bpf-next 02/14] xdp: initialize xdp_buff mb bit to 0 in all XDP drivers Lorenzo Bianconi
2020-12-07 21:15 ` Alexander Duyck
2020-12-07 21:37 ` Maciej Fijalkowski
2020-12-07 23:20 ` Saeed Mahameed
2020-12-08 10:31 ` Lorenzo Bianconi
2020-12-08 13:29 ` Jesper Dangaard Brouer
2020-12-07 16:32 ` [PATCH v5 bpf-next 03/14] xdp: add xdp_shared_info data structure Lorenzo Bianconi
2020-12-08 0:22 ` Saeed Mahameed
2020-12-08 11:01 ` Lorenzo Bianconi
2020-12-19 14:53 ` Shay Agroskin
2020-12-19 15:30 ` Jamal Hadi Salim
2020-12-21 9:01 ` Jesper Dangaard Brouer
2020-12-21 13:00 ` Jamal Hadi Salim
2020-12-20 17:52 ` Lorenzo Bianconi
2020-12-21 20:55 ` Shay Agroskin
2020-12-07 16:32 ` [PATCH v5 bpf-next 04/14] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 05/14] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 06/14] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2020-12-19 15:56 ` Shay Agroskin
2020-12-20 18:06 ` Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 07/14] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 08/14] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 09/14] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 10/14] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 11/14] bpf: cpumap: introduce xdp multi-buff support Lorenzo Bianconi
2020-12-19 17:46 ` Shay Agroskin
2020-12-20 17:56 ` Lorenzo Bianconi [this message]
2020-12-07 16:32 ` [PATCH v5 bpf-next 12/14] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 13/14] bpf: add new frame_length field to the XDP ctx Lorenzo Bianconi
2020-12-08 22:17 ` Maciej Fijalkowski
2020-12-09 10:35 ` Eelco Chaudron
2020-12-09 11:10 ` Maciej Fijalkowski
2020-12-09 12:07 ` Eelco Chaudron
2020-12-15 13:28 ` Eelco Chaudron
2020-12-15 18:06 ` Maciej Fijalkowski
2020-12-16 14:08 ` Eelco Chaudron
2021-01-15 16:36 ` Eelco Chaudron
2021-01-18 16:48 ` Maciej Fijalkowski
2021-01-20 13:20 ` Eelco Chaudron
2021-02-01 16:00 ` Eelco Chaudron
2020-12-07 16:32 ` [PATCH v5 bpf-next 14/14] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi
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='CAJ0CqmXB2fBoUHgOcpXOkEhfV2Bp=Np+2rhKSOCaZiFdz4WZPQ@mail.gmail.com' \
--to=lorenzo.bianconi@redhat.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=brouer@redhat.com \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=dsahern@kernel.org \
--cc=echaudro@redhat.com \
--cc=jasowang@redhat.com \
--cc=john.fastabend@gmail.com \
--cc=kuba@kernel.org \
--cc=lorenzo@kernel.org \
--cc=netdev@vger.kernel.org \
--cc=sameehj@amazon.com \
--cc=shayagr@amazon.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).