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From: Breno Leitao <[email protected]>
To: Keith Busch <[email protected]>
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected], [email protected],
	[email protected], [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected],
	[email protected]
Subject: Re: [PATCH RFC] io_uring: Pass whole sqe to commands
Date: Tue, 11 Apr 2023 05:22:50 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On Fri, Apr 07, 2023 at 12:51:44PM -0600, Keith Busch wrote:
> > @@ -63,14 +63,15 @@ EXPORT_SYMBOL_GPL(io_uring_cmd_done);
> >  int io_uring_cmd_prep_async(struct io_kiocb *req)
> >  {
> >  	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
> > -	size_t cmd_size;
> > +	size_t size = sizeof(struct io_uring_sqe);
> >  
> >  	BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
> >  	BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
> 
> One minor suggestion. The above is the only user of uring_cmd_pdu_size() now,
> which is kind of a convoluted way to enfoce the offset of the 'cmd' field. It
> may be more clear to replace these with:

I agree with you here. Basically it is a bug if the payload (pdu) size is
is different than 16 for single SQE or != 80 for extended SQE.

So, basically it is checking for two things:
   * the cmd offset is 48
   * the io_uring_sqe struct is 64

Since this is a uapi, I am not confidence that they will change at all.
I can replace the code with your suggestion.

> 	BUILD_BUG_ON(offsetof(struct io_uring_sqe, cmd) == 48);

It should be "offset(struct io_uring_sqe, cmd) != 48)", right?

Thanks for the review!

  reply	other threads:[~2023-04-11 12:22 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-06 14:43 [PATCH 0/5] add initial io_uring_cmd support for sockets Breno Leitao
2023-04-06 14:43 ` [RFC PATCH 1/4] net: wire up support for file_operations->uring_cmd() Breno Leitao
2023-04-06 14:43 ` [RFC PATCH 2/4] net: add uring_cmd callback to UDP Breno Leitao
2023-04-11 12:54   ` Pavel Begunkov
2023-04-06 14:43 ` [RFC PATCH 3/4] net: add uring_cmd callback to TCP Breno Leitao
2023-04-06 14:43 ` [RFC PATCH 4/4] net: add uring_cmd callback to raw "protocol" Breno Leitao
2023-04-06 15:34 ` [PATCH 0/5] add initial io_uring_cmd support for sockets Willem de Bruijn
2023-04-06 15:59   ` Breno Leitao
2023-04-06 18:16     ` Willem de Bruijn
2023-04-07  2:46       ` David Ahern
2023-04-11 12:00         ` Breno Leitao
2023-04-11 14:36           ` David Ahern
2023-04-11 14:41             ` Jens Axboe
2023-04-11 14:51               ` Willem de Bruijn
2023-04-11 14:54                 ` Jens Axboe
2023-04-11 15:00                   ` Willem de Bruijn
2023-04-11 15:06                     ` Jens Axboe
2023-04-11 15:24                       ` Willem de Bruijn
2023-04-11 15:28                         ` Jens Axboe
2023-04-12 13:53                           ` Breno Leitao
2023-04-12 14:28                             ` Willem de Bruijn
2023-04-13  0:02                               ` Breno Leitao
2023-04-13 14:24                                 ` Willem de Bruijn
2023-04-13 14:45                                   ` Jakub Kicinski
2023-04-13 14:57                                   ` David Laight
2023-04-18 13:23                                   ` Breno Leitao
2023-04-18 19:41                                     ` Willem de Bruijn
2023-04-20 14:43                                       ` Breno Leitao
2023-04-20 16:48                                         ` Willem de Bruijn
2023-04-11 15:10               ` David Ahern
2023-04-11 15:17                 ` Jens Axboe
2023-04-11 15:27                   ` David Ahern
2023-04-11 15:29                     ` Jens Axboe
2023-04-12  7:39                     ` David Laight
2023-04-06 16:41 ` Keith Busch
2023-04-06 16:49   ` Jens Axboe
2023-04-06 16:58   ` Breno Leitao
2023-04-06 16:57 ` [PATCH RFC] io_uring: Pass whole sqe to commands Breno Leitao
2023-04-07 18:51   ` Keith Busch
2023-04-11 12:22     ` Breno Leitao [this message]
2023-04-11 12:39       ` Pavel Begunkov
2023-04-13  2:56   ` Ming Lei
2023-04-13 16:47     ` Breno Leitao
2023-04-14  2:12       ` Ming Lei
2023-04-14 13:12         ` Pavel Begunkov
2023-04-14 13:59           ` Ming Lei
2023-04-14 14:56             ` Pavel Begunkov
2023-04-16  9:51               ` Ming Lei

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