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From: Ming Lei <[email protected]>
To: Jens Axboe <[email protected]>
Cc: [email protected], [email protected],
	Pavel Begunkov <[email protected]>,
	Kevin Wolf <[email protected]>,
	[email protected]
Subject: Re: [PATCH 2/9] io_uring: support user sqe ext flags
Date: Tue, 23 Apr 2024 21:57:26 +0800	[thread overview]
Message-ID: <Zie+RlbtckZJVE2J@fedora> (raw)
In-Reply-To: <[email protected]>

On Mon, Apr 22, 2024 at 12:16:12PM -0600, Jens Axboe wrote:
> On 4/7/24 7:03 PM, Ming Lei wrote:
> > sqe->flags is u8, and now we have used 7 bits, so take the last one for
> > extending purpose.
> > 
> > If bit7(IOSQE_HAS_EXT_FLAGS_BIT) is 1, it means this sqe carries ext flags
> > from the last byte(.ext_flags), or bit23~bit16 of sqe->uring_cmd_flags for
> > IORING_OP_URING_CMD.
> > 
> > io_slot_flags() return value is converted to `ULL` because the affected bits
> > are beyond 32bit now.
> 
> If we're extending flags, which is something we arguably need to do at
> some point, I think we should have them be generic and not spread out.

Sorry, maybe I don't get your idea, and the ext_flag itself is always
initialized in io_init_req(), like normal sqe->flags, same with its
usage.

> If uring_cmd needs specific flags and don't have them, then we should
> add it just for that.

The only difference is that bit23~bit16 of sqe->uring_cmd_flags is
borrowed for uring_cmd's ext flags, because sqe byte0~47 have been taken,
and can't be reused for generic flag. If we want to use byte48~63, it has
to be overlapped with uring_cmd's payload, and it is one generic sqe
flag, which is applied on uring_cmd too.

That is the only way I thought of, or any other suggestion for extending sqe
flags generically?


Thanks,
Ming


  reply	other threads:[~2024-04-23 13:57 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-08  1:03 [RFC PATCH 0/9] io_uring: support sqe group and provide group kbuf Ming Lei
2024-04-08  1:03 ` [PATCH 1/9] io_uring: net: don't check sqe->__pad2[0] for send zc Ming Lei
2024-04-08  1:03 ` [PATCH 2/9] io_uring: support user sqe ext flags Ming Lei
2024-04-22 18:16   ` Jens Axboe
2024-04-23 13:57     ` Ming Lei [this message]
2024-04-29 15:24       ` Pavel Begunkov
2024-04-30  3:43         ` Ming Lei
2024-04-30 12:00           ` Pavel Begunkov
2024-04-30 12:56             ` Ming Lei
2024-04-30 14:10               ` Pavel Begunkov
2024-04-30 15:46                 ` Ming Lei
2024-05-02 14:22                   ` Pavel Begunkov
2024-05-04  1:19                     ` Ming Lei
2024-04-08  1:03 ` [PATCH 3/9] io_uring: add helper for filling cqes in __io_submit_flush_completions() Ming Lei
2024-04-08  1:03 ` [PATCH 4/9] io_uring: add one output argument to io_submit_sqe Ming Lei
2024-04-08  1:03 ` [PATCH 5/9] io_uring: support SQE group Ming Lei
2024-04-22 18:27   ` Jens Axboe
2024-04-23 13:08     ` Kevin Wolf
2024-04-24  1:39       ` Ming Lei
2024-04-25  9:27         ` Kevin Wolf
2024-04-26  7:53           ` Ming Lei
2024-04-26 17:05             ` Kevin Wolf
2024-04-29  3:34               ` Ming Lei
2024-04-29 15:48         ` Pavel Begunkov
2024-04-30  3:07           ` Ming Lei
2024-04-29 15:32       ` Pavel Begunkov
2024-04-30  3:03         ` Ming Lei
2024-04-30 12:27           ` Pavel Begunkov
2024-04-30 15:00             ` Ming Lei
2024-05-02 14:09               ` Pavel Begunkov
2024-05-04  1:56                 ` Ming Lei
2024-05-02 14:28               ` Pavel Begunkov
2024-04-24  0:46     ` Ming Lei
2024-04-08  1:03 ` [PATCH 6/9] io_uring: support providing sqe group buffer Ming Lei
2024-04-08  1:03 ` [PATCH 7/9] io_uring/uring_cmd: support provide group kernel buffer Ming Lei
2024-04-08  1:03 ` [PATCH 8/9] ublk: support provide io buffer Ming Lei
2024-04-08  1:03 ` [RFC PATCH 9/9] liburing: support sqe ext_flags & sqe group Ming Lei
2024-04-19  0:55 ` [RFC PATCH 0/9] io_uring: support sqe group and provide group kbuf Ming Lei

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