From: Eric Dumazet <edumazet@google.com>
To: Alexander H Duyck <alexander.duyck@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, netdev <netdev@vger.kernel.org>,
Coco Li <lixiaoyan@google.com>
Subject: Re: [PATCH net-next 05/15] ipv6/gso: remove temporary HBH/jumbo header
Date: Thu, 3 Feb 2022 13:41:56 -0800 [thread overview]
Message-ID: <CANn89iLLgF6f6YQkd26OxL0Fy3hUEx2KQ+PBQ7p6w8zRUpaC_w@mail.gmail.com> (raw)
In-Reply-To: <802be507c28b9c1815e6431e604964b79070cd40.camel@gmail.com>
On Thu, Feb 3, 2022 at 1:08 PM Alexander H Duyck
<alexander.duyck@gmail.com> wrote:
>
> On Thu, 2022-02-03 at 11:59 -0800, Eric Dumazet wrote:
> > On Thu, Feb 3, 2022 at 11:45 AM Alexander Duyck
> > <alexander.duyck@gmail.com> wrote:
> >
> > > It is the fact that you are adding IPv6 specific code to the
> > > net/core/skbuff.c block here. Logically speaking if you are adding the
> > > header in ipv6_gro_receive then it really seems li:ke the logic to
> > > remove the header really belongs in ipv6_gso_segment. I suppose this
> > > is an attempt to optimize it though, since normally updates to the
> > > header are done after segmentation instead of before.
> >
> > Right, doing this at the top level means we do the thing once only,
> > instead of 45 times if the skb has 45 segments.
>
> I'm just wondering if there is a way for us to do it in
> ipv6_gso_segment directly instead though. With this we essentially end
> up having to free the skb if the segmentation fails anyway since it
> won't be able to go out on the wire.
>
Having a HBH jumbo header in place while the current frame is MTU size
(typically MTU < 9000) would
violate the specs. A HBH jumbo header presence implies packet length > 64K.
> If we assume the stack will successfully segment the frame then it
> might make sense to just take care of the hop-by-hop header before we
> start processing the L4 protocol.
next prev parent reply other threads:[~2022-02-03 21:42 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-03 1:51 [PATCH net-next 00/15] tcp: BIG TCP implementation Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 01/15] net: add netdev->tso_ipv6_max_size attribute Eric Dumazet
2022-02-03 16:34 ` Jakub Kicinski
2022-02-03 16:56 ` Eric Dumazet
2022-02-03 18:58 ` Jakub Kicinski
2022-02-03 19:12 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 02/15] ipv6: add dev->gso_ipv6_max_size Eric Dumazet
2022-02-03 8:57 ` Paolo Abeni
2022-02-03 15:34 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 03/15] tcp_cubic: make hystart_ack_delay() aware of BIG TCP Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 04/15] ipv6: add struct hop_jumbo_hdr definition Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 05/15] ipv6/gso: remove temporary HBH/jumbo header Eric Dumazet
2022-02-03 18:53 ` Alexander H Duyck
2022-02-03 19:17 ` Eric Dumazet
2022-02-03 19:45 ` Alexander Duyck
2022-02-03 19:59 ` Eric Dumazet
2022-02-03 21:08 ` Alexander H Duyck
2022-02-03 21:41 ` Eric Dumazet [this message]
2022-02-04 0:05 ` Alexander Duyck
2022-02-04 0:27 ` Eric Dumazet
2022-02-04 1:14 ` Eric Dumazet
2022-02-04 1:48 ` Eric Dumazet
2022-02-04 2:15 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 06/15] ipv6/gro: insert " Eric Dumazet
2022-02-03 9:19 ` Paolo Abeni
2022-02-03 15:48 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 07/15] ipv6: add GRO_IPV6_MAX_SIZE Eric Dumazet
2022-02-03 2:18 ` Eric Dumazet
2022-02-03 10:44 ` Paolo Abeni
2022-02-03 1:51 ` [PATCH net-next 08/15] ipv6: Add hop-by-hop header to jumbograms in ip6_output Eric Dumazet
2022-02-03 9:07 ` Paolo Abeni
2022-02-03 16:31 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 09/15] net: increase MAX_SKB_FRAGS Eric Dumazet
2022-02-03 5:02 ` kernel test robot
2022-02-03 5:20 ` Eric Dumazet
2022-02-03 5:31 ` Jakub Kicinski
2022-02-03 6:35 ` Eric Dumazet
2022-02-03 5:23 ` kernel test robot
2022-02-03 5:43 ` kernel test robot
2022-02-03 16:01 ` Paolo Abeni
2022-02-03 17:26 ` Alexander H Duyck
2022-02-03 17:34 ` Eric Dumazet
2022-02-03 17:56 ` Alexander Duyck
2022-02-03 19:18 ` Jakub Kicinski
2022-02-03 19:20 ` Eric Dumazet
2022-02-03 19:54 ` Eric Dumazet
2022-02-04 10:18 ` David Laight
2022-02-04 15:46 ` Alexander Duyck
2022-02-03 1:51 ` [PATCH net-next 10/15] net: loopback: enable BIG TCP packets Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 11/15] bonding: update dev->tso_ipv6_max_size Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 12/15] macvlan: enable BIG TCP Packets Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 13/15] ipvlan: " Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 14/15] mlx4: support BIG TCP packets Eric Dumazet
2022-02-03 13:04 ` Tariq Toukan
2022-02-03 15:54 ` Eric Dumazet
2022-02-03 1:51 ` [PATCH net-next 15/15] mlx5: " Eric Dumazet
2022-02-03 7:27 ` Tariq Toukan
2022-02-04 4:03 ` kernel test robot
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=CANn89iLLgF6f6YQkd26OxL0Fy3hUEx2KQ+PBQ7p6w8zRUpaC_w@mail.gmail.com \
--to=edumazet@google.com \
--cc=alexander.duyck@gmail.com \
--cc=davem@davemloft.net \
--cc=eric.dumazet@gmail.com \
--cc=kuba@kernel.org \
--cc=lixiaoyan@google.com \
--cc=netdev@vger.kernel.org \
/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).