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

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Date:   Mon, 24 Oct 2022 14:49:02 +0200
From:   Stefan Metzmacher <metze@...ba.org>
To:     Jens Axboe <axboe@...nel.dk>,
        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
Subject: Re: [PATCH for-6.1 1/3] net: flag sockets supporting msghdr
 originated zerocopy

Am 22.10.22 um 18:07 schrieb Jens Axboe:
> 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.

I'm now always getting -EOPNOTSUPP from SENDMSG_ZC for tcp connections...

metze