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From: Christoph Hellwig <hch@lst.de>
To: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Cc: kbusch@kernel.org, logang@deltatee.com, hch@lst.de,
	linux-nvme@lists.infradead.org, sagi@grimberg.me
Subject: Re: [PATCH V2 11/12] nvmet: use minimized version of blk_rq_append_bio
Date: Thu, 3 Sep 2020 18:23:08 +0200	[thread overview]
Message-ID: <20200903162308.GF25423@lst.de> (raw)
In-Reply-To: <20200831222707.35611-12-chaitanya.kulkarni@wdc.com>

On Mon, Aug 31, 2020 at 03:27:06PM -0700, Chaitanya Kulkarni wrote:
> The function blk_rq_append_bio() is a genereric API written for all
> types driver (having bounce buffers) and different context (where
> request is already having a bio i.e. rq->bio != NULL).
> 
> It does mainly three things: calculating the segments, bounce queue and
> if req->bio == NULL call blk_rq_bio_prep() or handle low level merge()
> case.
> 
> The NVMe PCIe driver does not use the queue bounce mechanism. In order
> to find this out for each request processing in the passthru
> blk_rq_append_bio() does extra work in the fast path for each request.

We need to be able to deal with all transport drivers.  None of them
uses bounce buffering, but the changelog needs to be correct.

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  reply	other threads:[~2020-09-03 16:23 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-31 22:26 [PATCH V2 00/12] nvmet: passthru fixes and improvements Chaitanya Kulkarni
2020-08-31 22:26 ` [PATCH V2 01/12] nvme-core: annotate nvme_alloc_request() Chaitanya Kulkarni
2020-09-01  1:56   ` Baolin Wang
2020-09-01 17:21     ` Sagi Grimberg
2020-09-01 21:16       ` Chaitanya Kulkarni
2020-09-02  3:28       ` Chaitanya Kulkarni
2020-09-02 22:02       ` Chaitanya Kulkarni
2020-09-03 16:17   ` Christoph Hellwig
2020-09-03 19:40     ` Chaitanya Kulkarni
2020-09-08  8:57       ` Christoph Hellwig
2020-08-31 22:26 ` [PATCH V2 02/12] nvmet: for pt I/O commands use likely for ns check Chaitanya Kulkarni
2020-09-03 16:18   ` Christoph Hellwig
2020-09-03 18:21     ` Chaitanya Kulkarni
2020-08-31 22:26 ` [PATCH V2 03/12] nvmet: use consistent type with id->nlbaf Chaitanya Kulkarni
2020-09-01 15:55   ` Keith Busch
2020-09-01 21:17     ` Chaitanya Kulkarni
2020-09-01 21:31       ` Logan Gunthorpe
2020-09-01 22:03       ` Keith Busch
2020-08-31 22:26 ` [PATCH V2 04/12] nvmet: use consistent type for op_flag Chaitanya Kulkarni
2020-09-03 16:20   ` Christoph Hellwig
2020-09-03 18:35     ` Chaitanya Kulkarni
2020-08-31 22:27 ` [PATCH V2 05/12] nvmet: use unlikely for uncommon commands Chaitanya Kulkarni
2020-09-03 16:20   ` Christoph Hellwig
2020-09-03 18:37     ` Chaitanya Kulkarni
2020-08-31 22:27 ` [PATCH V2 06/12] nvmet: remove op_flags for write commands Chaitanya Kulkarni
2020-08-31 22:27 ` [PATCH V2 07/12] nvmet: decouple nvme_ctrl_get_by_path() Chaitanya Kulkarni
2020-09-01 17:00   ` Logan Gunthorpe
2020-08-31 22:27 ` [PATCH V2 08/12] nvmet: move get/put ctrl into dev open/release Chaitanya Kulkarni
2020-09-01 17:02   ` Logan Gunthorpe
2020-09-01 17:18     ` Sagi Grimberg
2020-09-02  0:31       ` Chaitanya Kulkarni
2020-09-03 16:21       ` Christoph Hellwig
2020-09-03 18:22         ` Chaitanya Kulkarni
2020-08-31 22:27 ` [PATCH V2 09/12] nvmet: fix nvme module ref count Oops Chaitanya Kulkarni
2020-09-01 17:23   ` Logan Gunthorpe
2020-08-31 22:27 ` [PATCH V2 10/12] block: move blk_rq_bio_prep() to linux/blk-mq.h Chaitanya Kulkarni
2020-08-31 22:27 ` [PATCH V2 11/12] nvmet: use minimized version of blk_rq_append_bio Chaitanya Kulkarni
2020-09-03 16:23   ` Christoph Hellwig [this message]
2020-09-03 18:23     ` Chaitanya Kulkarni
2020-08-31 22:27 ` [PATCH V2 12/12] nvmet: use inline bio for passthru fast path Chaitanya Kulkarni
2020-09-01 17:29   ` Logan Gunthorpe
2020-09-02  0:39     ` Chaitanya Kulkarni
2020-09-02 15:41       ` Logan Gunthorpe
2020-09-02 21:04         ` Chaitanya Kulkarni

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