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Date:   Fri, 21 Oct 2022 11:42:07 +0100
From:   Pavel Begunkov <>
To:     Stefan Metzmacher <>, Jens Axboe <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        "David S . Miller" <>
Subject: Re: [PATCH for-6.1 0/3] fail io_uring zc with sockets not supporting

On 10/21/22 11:27, Stefan Metzmacher wrote:
> Hi Pavel,
>> Some sockets don't care about msghdr::ubuf_info and would execute the
>> request by copying data. Such fallback behaviour was always a pain in
>> my experience, so we'd rather want to fail such requests and have a more
>> robust api in the future.
>> Mark struct socket that support it with a new SOCK_SUPPORT_ZC flag.
>> I'm not entirely sure it's the best place for the flag but at least
>> we don't have to do a bunch of extra dereferences in the hot path.
> I'd give the flag another name that indicates msg_ubuf and

Could be renamed, e.g. SOCK_SUPPORT_MSGHDR_UBUF or maybe

> have a 2nd flag that can indicate support for SO_ZEROCOPY in sk_setsockopt()

There is absolutely no reason to introduce a second flag here, it has
nothing to do with SO_ZEROCOPY.

> The SO_ZEROCOPY version is also provided by AF_RDS.

Pavel Begunkov

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