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From: Maxim Levitsky <mlevitsk@redhat.com>
To: John Snow <jsnow@redhat.com>, qemu-devel@nongnu.org
Cc: Fam Zheng <fam@euphon.net>, Kevin Wolf <kwolf@redhat.com>,
	qemu-block@nongnu.org, Max Reitz <mreitz@redhat.com>,
	John Ferlan <jferlan@redhat.com>, Keith Busch <kbusch@kernel.org>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 2/2] block/nvme: add support for discard
Date: Thu, 05 Sep 2019 20:32:20 +0300
Message-ID: <175525aa509b64571783ea49ac02ac4f201cf01d.camel@redhat.com> (raw)
In-Reply-To: <58a83617-9ffd-b775-976b-ccfbc87d65c1@redhat.com>

On Thu, 2019-09-05 at 13:27 -0400, John Snow wrote:
> 
> On 9/5/19 9:24 AM, Maxim Levitsky wrote:
> > On Wed, 2019-08-28 at 12:03 +0300, Maxim Levitsky wrote:
> > > On Tue, 2019-08-27 at 18:29 -0400, John Snow wrote:
> > > > 
> > > > On 8/25/19 3:15 AM, Maxim Levitsky wrote:
> > > > > Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> > > > > ---
> > > > >  block/nvme.c       | 83 ++++++++++++++++++++++++++++++++++++++++++++++
> > > > >  block/trace-events |  2 ++
> > > > >  2 files changed, 85 insertions(+)
> > > > > 
> > > > > diff --git a/block/nvme.c b/block/nvme.c
> > > > > index f8bd11e19a..dd041f39c9 100644
> > > > > --- a/block/nvme.c
> > > > > +++ b/block/nvme.c
> > > > > @@ -112,6 +112,7 @@ typedef struct {
> > > > >      bool plugged;
> > > > >  
> > > > >      bool supports_write_zeros;
> > > > > +    bool supports_discard;
> > > > >  
> > > > >      CoMutex dma_map_lock;
> > > > >      CoQueue dma_flush_queue;
> > > > > @@ -463,6 +464,7 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp)
> > > > >  
> > > > >      oncs = le16_to_cpu(idctrl->oncs);
> > > > >      s->supports_write_zeros = (oncs & NVME_ONCS_WRITE_ZEROS) != 0;
> > > > > +    s->supports_discard = (oncs & NVME_ONCS_DSM) != 0;
> > > > 
> > > > Same comment -- checking !!(register & FIELD) is nicer than the
> > > > negative. (I'm actually not sure even the !! is needed, but it seems to
> > > > be a QEMU-ism and I've caught myself using it...)
> > > 
> > > All right, no problem to use !!
> > > 
> > > > 
> > > > Rest looks good to me on a skim, but I'm not very well-versed in NVME.
> > > 
> > > Thanks!
> > > 
> > 
> > Kind ping about this patch series.
> > 
> > Apart from using !!, do you think that this patch series
> > can be merged, or should I do anything else?
> > Which tree do you think this should be committed to?
> > 
> > I kind of want to see that merged before the freeze
> > starts, if there are no objections,
> > to reduce the amount of pending stuff in my queue.
> > 
> 
> Didn't I ask a few other things?
> 
> like not using "res30" because you've moved the fields around, and
> trying to be consistent about "zeros" vs "zeroes".
> 
> Removing "+#define NVME_ID_NS_DLFEAT_GUARD_CRC(dlfeat)       ((dlfeat) &
> 0x10)" because it's unused.


All right I forgot about it, that's one of they joys of duplication of a kernel
driver in the userspace...


> 
> You also probably require review (or at least an ACK) from Keith Busch
> who maintains this file.
> 
> --js

All right,
	Best regards,
		Maxim Levitsky




  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-25  7:15 [Qemu-devel] [PATCH 0/2] block/nvme: add support for write zeros and discard Maxim Levitsky
2019-08-25  7:15 ` [Qemu-devel] [PATCH 1/2] block/nvme: add support for write zeros Maxim Levitsky
2019-08-27 22:22   ` John Snow
2019-08-28  9:02     ` Maxim Levitsky
2019-09-13 13:30     ` Maxim Levitsky
2019-08-25  7:15 ` [Qemu-devel] [PATCH 2/2] block/nvme: add support for discard Maxim Levitsky
2019-08-27 22:29   ` John Snow
2019-08-28  9:03     ` Maxim Levitsky
2019-09-05 13:24       ` Maxim Levitsky
2019-09-05 17:27         ` John Snow
2019-09-05 17:32           ` Maxim Levitsky [this message]
2019-09-09  9:25           ` Max Reitz
2019-09-09 17:03             ` John Snow
2019-09-10 14:49               ` Paolo Bonzini
2019-09-10 14:57                 ` Maxim Levitsky

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