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

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Date:   Sat, 22 Oct 2022 16:57:29 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, 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 10/21/22 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


> https://lore.kernel.org/all/dc549a4d5c1d2031c64794c8e12bed55afb85c3e.1666287924.git.pabeni@redhat.com/
> and avoid the conflict.

-- 
Pavel Begunkov