linux-kernel - [RFCv2 1/7] virtio-scsi.h: Add virtio_scsi_cmd_req

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Message-Id: <1395034381-656-2-git-send-email-nab@daterainc.com>
Date:	Mon, 17 Mar 2014 05:32:55 +0000
From:	"Nicholas A. Bellinger" <nab@...erainc.com>
To:	target-devel <target-devel@...r.kernel.org>
Cc:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kvm-devel <kvm@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Sagi Grimberg <sagig@...lanox.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Sagi Grimberg <sagig@....mellanox.co.il>
Subject: [RFCv2 1/7] virtio-scsi.h: Add virtio_scsi_cmd_req_pi header definition

From: Nicholas Bellinger <nab@...ux-iscsi.org>

This patch adds a virtio_scsi_cmd_req_pi header as recommened by
Paolo that contains do_pi_niov + di_pi_niov elements used for
signaling when protection information buffers are expected to
preceed the data buffers.

Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Martin K. Petersen <martin.petersen@...cle.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Hannes Reinecke <hare@...e.de>
Cc: Sagi Grimberg <sagig@....mellanox.co.il>
Cc: H. Peter Anvin <hpa@...or.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
---
 include/linux/virtio_scsi.h |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/include/linux/virtio_scsi.h b/include/linux/virtio_scsi.h
index 4195b97..4dc5998 100644
--- a/include/linux/virtio_scsi.h
+++ b/include/linux/virtio_scsi.h
@@ -35,11 +35,23 @@ struct virtio_scsi_cmd_req {
 	u8 lun[8];		/* Logical Unit Number */
 	u64 tag;		/* Command identifier */
 	u8 task_attr;		/* Task attribute */
-	u8 prio;
+	u8 prio;		/* SAM command priority field */
 	u8 crn;
 	u8 cdb[VIRTIO_SCSI_CDB_SIZE];
 } __packed;
 
+/* SCSI command request, followed by protection information */
+struct virtio_scsi_cmd_req_pi {
+	u8 lun[8];		/* Logical Unit Number */
+	u64 tag;		/* Command identifier */
+	u8 task_attr;		/* Task attribute */
+	u8 prio;		/* SAM command priority field */
+	u8 crn;
+	u16 do_pi_niov;		/* DataOUT PI Number of iovecs */
+	u16 di_pi_niov;		/* DataIN PI Number of iovecs */
+	u8 cdb[VIRTIO_SCSI_CDB_SIZE];
+} __packed;
+
 /* Response, followed by sense data and data-in */
 struct virtio_scsi_cmd_resp {
 	u32 sense_len;		/* Sense data length */
-- 
1.7.2.5

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