netdev - Re: [PATCH 0/3] PROTO_CMSG_DATA

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Date:   Sat, 12 Dec 2020 21:42:26 +0000
From:   Victor Stewart <v@...etag.social>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     io-uring <io-uring@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        netdev <netdev@...r.kernel.org>,
        Stefan Metzmacher <metze@...ba.org>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH 0/3] PROTO_CMSG_DATA_ONLY for Datagram (UDP)

On Sat, Dec 12, 2020 at 6:02 PM Jens Axboe <axboe@...nel.dk> wrote:
>
> On 12/12/20 10:58 AM, Victor Stewart wrote:
> > On Sat, Dec 12, 2020 at 5:40 PM Jens Axboe <axboe@...nel.dk> wrote:
> >>
> >> On 12/12/20 10:25 AM, Victor Stewart wrote:
> >>> On Sat, Dec 12, 2020 at 5:07 PM Jens Axboe <axboe@...nel.dk> wrote:
> >>>>
> >>>> On 12/12/20 8:31 AM, Victor Stewart wrote:
> >>>>> RE our conversation on the "[RFC 0/1] whitelisting UDP GSO and GRO
> >>>>> cmsgs" thread...
> >>>>>
> >>>>> https://lore.kernel.org/io-uring/CAM1kxwi5m6i8hrtkw7nZYoziPTD-Wp03+fcsUwh3CuSc=81kUQ@mail.gmail.com/
> >>>>>
> >>>>> here are the patches we discussed.
> >>>>>
> >>>>> Victor Stewart (3):
> >>>>>    net/socket.c: add PROTO_CMSG_DATA_ONLY to __sys_sendmsg_sock
> >>>>>    net/ipv4/af_inet.c: add PROTO_CMSG_DATA_ONLY to inet_dgram_ops
> >>>>>    net/ipv6/af_inet6.c: add PROTO_CMSG_DATA_ONLY to inet6_dgram_ops
> >>>>>
> >>>>>    net/ipv4/af_inet.c
> >>>>>      |   1 +
> >>>>>    net/ipv6/af_inet6.c
> >>>>>     |   1 +
> >>>>>    net/socket.c
> >>>>>        |   8 +-
> >>>>>    3 files changed, 7 insertions(+), 3 deletions(-)
> >>>>
> >>>> Changes look fine to me, but a few comments:
> >>>>
> >>>> - I'd order 1/3 as 3/3, that ordering makes more sense as at that point it
> >>>>   could actually be used.
> >>>
> >>> right that makes sense.
> >>>
> >>>>
> >>>> - For adding it to af_inet/af_inet6, you should write a better commit message
> >>>>   on the reasoning for the change. Right now it just describes what the
> >>>>   patch does (which is obvious from the change), not WHY it's done. Really
> >>>>   goes for current 1/3 as well, commit messages need to be better in
> >>>>   general.
> >>>>
> >>>
> >>> okay thanks Jens. i would have reiterated the intention but assumed it
> >>> were implicit given I linked the initial conversation about enabling
> >>> UDP_SEGMENT (GSO) and UDP_GRO through io_uring.
> >>>
> >>>> I'd also CC Jann Horn on the series, he's the one that found an issue there
> >>>> in the past and also acked the previous change on doing PROTO_CMSG_DATA_ONLY.
> >>>
> >>> I CCed him on this reply. Soheil at the end of the first exchange
> >>> thread said he audited the UDP paths and believed this to be safe.
> >>>
> >>> how/should I resubmit the patch with a proper intention explanation in
> >>> the meta and reorder the patches? my first patch and all lol.
> >>
> >> Just post is as a v2 with the change noted in the cover letter. I'd also
> >> ensure that it threads properly, right now it's just coming through as 4
> >> separate emails at my end. If you're using git send-email, make sure you
> >> add --thread to the arguments.
> >
> > oh i didn't know about git send-email. i was manually constructing /
> > sending them lol. thanks!
>
> I'd recommend it, makes sure your mailer doesn't mangle anything either. FWIW,
> this is what I do:
>
> git format-patch sha1..sha2
> mv 00*.patch /tmp/x
>
> git send-email --no-signed-off-by-cc --thread --compose  --to linux-fsdevel@...r.kernel.org --cc torvalds@...ux-foundation.org --cc viro@...iv.linux.org.uk /tmp/x
>
> (from a series I just sent out). And then I have the following section in
> ~/.gitconfig:
>
> [sendemail]
> from = Jens Axboe <axboe@...nel.dk>
> smtpserver = smtp.gmail.com
> smtpuser = axboe@...nel.dk
> smtpencryption = tls
> smtppass = hunter2
> smtpserverport = 587
>
> for using gmail to send them out.
>
> --compose will fire up your editor to construct the cover letter, and
> when you're happy with it, save+exit and git send-email will ask whether
> to proceed or abort.
>
> That's about all there is to it, and provides a consistent way to send out
> patch series.

awesome thanks! i'll be using this workflow from now on.

P.S. hope thats not your real password LOL

>
> --
> Jens Axboe
>