netdev - Re: [PATCH for-6.1 1/3] net: flag sockets supporting msghdr originated zerocopy

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Date:   Sat, 22 Oct 2022 10:07:08 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        "David S . Miller" <davem@...emloft.net>, io-uring@...r.kernel.org,
        netdev@...r.kernel.org, Stefan Metzmacher <metze@...ba.org>
Subject: Re: [PATCH for-6.1 1/3] net: flag sockets supporting msghdr
 originated zerocopy

On 10/22/22 9:57 AM, Pavel Begunkov wrote:
> On 10/21/22 17:14, Jakub Kicinski wrote:
>> On Fri, 21 Oct 2022 11:16:39 +0100 Pavel Begunkov wrote:
>>> We need an efficient way in io_uring to check whether a socket supports
>>> zerocopy with msghdr provided ubuf_info. Add a new flag into the struct
>>> socket flags fields.
>>>
>>> Cc: <stable@...r.kernel.org> # 6.0
>>> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
>>> ---
>>> ? include/linux/net.h | 1 +
>>> ? net/ipv4/tcp.c????? | 1 +
>>> ? net/ipv4/udp.c????? | 1 +
>>> ? 3 files changed, 3 insertions(+)
>>>
>>> diff --git a/include/linux/net.h b/include/linux/net.h
>>> index 711c3593c3b8..18d942bbdf6e 100644
>>> --- a/include/linux/net.h
>>> +++ b/include/linux/net.h
>>> @@ -41,6 +41,7 @@ struct net;
>>> ? #define SOCK_NOSPACE??????? 2
>>> ? #define SOCK_PASSCRED??????? 3
>>> ? #define SOCK_PASSSEC??????? 4
>>> +#define SOCK_SUPPORT_ZC??????? 5
>>
>> Acked-by: Jakub Kicinski <kuba@...nel.org>
>>
>> Any idea on when this will make it to Linus? If within a week we can
>> probably delay:
> 
> After a chat with Jens, IIUC he can take it and send out to
> Linus early. So, sounds like a good plan

Yes, and let's retain the name for now, can always be changed if we need
to make it more granular. I'll ship this off before -rc2.

-- 
Jens Axboe