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From: Pavel Begunkov <[email protected]>
To: Stefan Metzmacher <[email protected]>,
	[email protected], [email protected],
	[email protected]
Cc: "David S . Miller" <[email protected]>,
	Jakub Kicinski <[email protected]>,
	Jonathan Lemon <[email protected]>,
	Willem de Bruijn <[email protected]>,
	Jens Axboe <[email protected]>,
	[email protected]
Subject: Re: [RFC net-next v3 23/29] io_uring: allow to pass addr into sendzc
Date: Wed, 29 Jun 2022 10:53:36 +0100	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 6/29/22 08:42, Stefan Metzmacher wrote:
> 
> Hi Pavel,
> 
>> +    if (zc->addr) {
>> +        ret = move_addr_to_kernel(zc->addr, zc->addr_len, &address);
>> +        if (unlikely(ret < 0))
>> +            return ret;
>> +        msg.msg_name = (struct sockaddr *)&address;
>> +        msg.msg_namelen = zc->addr_len;
>> +    }
>> +
> 
> Given that this fills in msg almost completely can we also have
> a version of SENDMSGZC, it would be very useful to also allow
> msg_control to be passed and as well as an iovec.
> 
> Would that be possible?

Right, I left it to follow ups as the series is already too long.

fwiw, I'm going to also add addr to IORING_OP_SEND.


> Do I understand it correctly, that the reason for the new opcode is,
> that IO_OP_SEND would already work with existing MSG_ZEROCOPY behavior, together
> with the recvmsg based completion?

Right, it should work with MSG_ZEROCOPY, but with a different notification
semantics, would need recvmsg from error queues, and with performance
implications.


> In addition I wondering if a completion based on msg_iocb->ki_complete() (indicated by EIOCBQUEUED)
> what have also worked, just deferring the whole sendmsg operation until all buffers are no longer used.
> That way it would be possible to buffers are acked by the remote end when it comes back to the application
> layer.

There is msg_iocb, but it's mostly unused by protocols, IIRC apart
from crypto sockets. And then we'd need to repeat the path of
ubuf_info to handle stuff like skb splitting and perhaps also
changing rules for ->ki_complete


> I'm also wondering if the ki_complete() based approach should always be provided to sock_sendmsg()
> triggered by io_uring (independend of the new zerocopy stuff), it would basically work very simular to
> the uring_cmd() completions, which are able to handle both true async operation indicated by EIOCBQUEUED
> as well as EAGAIN triggered path via io-wq.

Would be even more similar to how we has always been doing
read/write, and rw requests do pass in a msg_iocb, but again,
it's largely ignored internally.

-- 
Pavel Begunkov

  reply	other threads:[~2022-06-29  9:57 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-28 18:56 [RFC net-next v3 00/29] io_uring zerocopy send Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 01/29] ipv4: avoid partial copy for zc Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 02/29] ipv6: " Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 03/29] skbuff: add SKBFL_DONT_ORPHAN flag Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 04/29] skbuff: carry external ubuf_info in msghdr Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 05/29] net: bvec specific path in zerocopy_sg_from_iter Pavel Begunkov
2022-06-28 20:06   ` Al Viro
2022-06-28 21:33     ` Pavel Begunkov
2022-06-28 22:52   ` David Ahern
2022-07-04 13:31     ` Pavel Begunkov
2022-07-05  2:28       ` David Ahern
2022-07-05 14:03         ` Pavel Begunkov
2022-07-05 22:09           ` Pavel Begunkov
2022-07-06 15:11             ` David Ahern
2022-06-28 18:56 ` [RFC net-next v3 06/29] net: optimise bvec-based zc page referencing Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 07/29] net: don't track pfmemalloc for managed frags Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 08/29] skbuff: don't mix ubuf_info of different types Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 09/29] ipv4/udp: support zc with managed data Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 10/29] ipv6/udp: " Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 11/29] tcp: " Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 12/29] tcp: kill extra io_uring's uarg refcounting Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 13/29] net: let callers provide extra ubuf_info refs Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 14/29] io_uring: opcode independent fixed buf import Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 15/29] io_uring: add zc notification infrastructure Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 16/29] io_uring: cache struct io_notif Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 17/29] io_uring: complete notifiers in tw Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 18/29] io_uring: add notification slot registration Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 19/29] io_uring: rename IORING_OP_FILES_UPDATE Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 20/29] io_uring: add zc notification flush requests Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 21/29] io_uring: wire send zc request type Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 22/29] io_uring: account locked pages for non-fixed zc Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 23/29] io_uring: allow to pass addr into sendzc Pavel Begunkov
2022-06-29  7:42   ` Stefan Metzmacher
2022-06-29  9:53     ` Pavel Begunkov [this message]
2022-08-13  8:45       ` Stefan Metzmacher
2022-08-15  9:46         ` Pavel Begunkov
2022-08-15 11:40           ` Stefan Metzmacher
2022-08-15 12:19             ` Pavel Begunkov
2022-08-15 13:30               ` Stefan Metzmacher
2022-08-15 14:09                 ` Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 24/29] io_uring: add rsrc referencing for notifiers Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 25/29] io_uring: sendzc with fixed buffers Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 26/29] io_uring: flush notifiers after sendzc Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 27/29] io_uring: allow to override zc tag on flush Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 28/29] io_uring: batch submission notif referencing Pavel Begunkov
2022-06-28 18:56 ` [RFC net-next v3 29/29] selftests/io_uring: test zerocopy send Pavel Begunkov
2022-06-28 19:03 ` [RFC net-next v3 00/29] io_uring " Pavel Begunkov

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