From: Keith Busch <kbusch@kernel.org>
To: Ming Lei <tom.leiming@gmail.com>
Cc: Tokunori Ikegami <ikegami.t@gmail.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
Subject: Re: [PATCH] block, nvme: Increase max segments parameter setting value
Date: Fri, 27 Mar 2020 21:13:35 -0600 [thread overview]
Message-ID: <20200328031334.GA18429@keith-busch> (raw)
In-Reply-To: <CACVXFVM=rT=86JrmAkySTg=gknfFL8Q1NU0uXWzoDMKMyL_mow@mail.gmail.com>
On Sat, Mar 28, 2020 at 10:11:57AM +0800, Ming Lei wrote:
> On Sat, Mar 28, 2020 at 2:18 AM Keith Busch <kbusch@kernel.org> wrote:
> >
> > This is actually even more confusing. We do not support 256MB transfers
> > within a single command in the pci nvme driver anymore. The max is 4MB,
> > so I don't see how increasing the max segments will help: you should be
> > hitting the 'max_sectors' limit if you don't hit the segment limit first.
>
> That looks a bug for passthrough req, because 'max_sectors' limit is only
> checked in bio_add_pc_page(), not done in blk_rq_append_bio(), something
> like the following seems required:
Shouldn't bio_map_user_iov() or bio_copy_user_iov() have caught the
length limit before proceeding to blk_rq_append_bio()?
next prev parent reply other threads:[~2020-03-28 3:13 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 18:23 [PATCH] block, nvme: Increase max segments parameter setting value Tokunori Ikegami
2020-03-23 19:14 ` Chaitanya Kulkarni
2020-03-23 23:09 ` Tokunori Ikegami
2020-03-24 0:02 ` Keith Busch
2020-03-24 16:51 ` Tokunori Ikegami
2020-03-27 17:50 ` Tokunori Ikegami
2020-03-27 18:18 ` Keith Busch
2020-03-28 2:11 ` Ming Lei
2020-03-28 3:13 ` Keith Busch [this message]
2020-03-28 8:28 ` Ming Lei
2020-03-28 12:57 ` Tokunori Ikegami
2020-03-29 3:01 ` Ming Lei
2020-03-30 9:15 ` Tokunori Ikegami
2020-03-30 13:53 ` Keith Busch
2020-03-31 15:24 ` Tokunori Ikegami
2020-03-31 14:13 ` Joshi
2020-03-31 15:37 ` Tokunori Ikegami
2020-03-24 7:16 ` Hannes Reinecke
2020-03-24 17:17 ` Tokunori Ikegami
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