netdev - Re: [PATCH 0/3] virtio-net: inline header support

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Date:	Sat, 06 Oct 2012 14:54:03 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	kvm@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sasha Levin <levinsasha928@...il.com>,
	virtualization@...ts.linux-foundation.org,
	Thomas Lendacky <tahm@...ux.vnet.ibm.com>, avi@...hat.com
Subject: Re: [PATCH 0/3] virtio-net: inline header support

Il 05/10/2012 07:43, Rusty Russell ha scritto:
>> >     struct virtio_scsi_req_cmd {
>> >         // Read-only
>> >         u8 lun[8];
>> >         u64 id;
>> >         u8 task_attr;
>> >         u8 prio;
>> >         u8 crn;
>> >         char cdb[cdb_size];
>> >         char dataout[];
>> >         // Write-only part
>> >         u32 sense_len;
>> >         u32 residual;
>> >         u16 status_qualifier;
>> >         u8 status;
>> >         u8 response;
>> >         u8 sense[sense_size];
>> >         char datain[];
>> >     };
>> >
>> > where cdb_size and sense_size come from configuration space.  The device
>> > right now expects everything before dataout/datain to be in a single
>> > descriptor, but that's in no way part of the spec.  Am I missing
>> > something egregious?
> Since you wrote it, I hope not :)

Yeah, I guess the confusion came from cdb_size and sense_size being in
configuration space.

> That's good.  But virtio_blk's scsi command is insoluble AFAICT.  As I
> said to Anthony, the best rules are "always" and "never", so I'd really
> rather not have to grandfather that in.

It is, but we can add a rule that if the (transport) flag
VIRTIO_RING_F_ANY_HEADER_SG is set, the cdb field is always 32 bytes in
virtio-blk.

Paolo
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