[stgt] Compiling tgt with FCP support

[FUJITA Tomonori]

On Sat, 10 Jul 2010 19:36:19 +1000
Mark Harvey <markh794 at gmail.com> wrote:

> Anybody have any experience or documentation they could share on how to 
> configure tgt to work with a QLogic 2xxx HBA ?

I tried three yeas ago but the patches haven't been merged into
the upstream qla2xxx driver:

http://marc.info/?l=linux-scsi&m=118857984231007&w=2 

The patches can't be applied to the current upstream driver.


> Attempts to compile using "make FCP=1" fails. I assume the source code 
> has to be extracted in a location relative to the linux kernel.. The 
> error messages relate to missing kernel header files..

We need to have the copy of the header file to make things easy (as we
have bsg.h). I've attached the patch.


> Any pointers on how to setup tgt with the QLogic HBA once I pass the 
> 'how to compile' stage would also be welcome :)
> 
> I'm currently assuming it will be a "tgtadm --lld fcp ...." and that's 
> all the magic needed.

All I have is:

http://marc.info/?l=linux-scsi&m=119104685420343&w=2
 
As I wrote above, it's difficult with the current upstream driver.


=
From: FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp>
Subject: [PATCH] add scsi_tgt_if.h

Signed-off-by: FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp>
---
 usr/scsi_tgt_if.h |  108 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 usr/tgtif.c       |    2 +-
 2 files changed, 109 insertions(+), 1 deletions(-)
 create mode 100644 usr/scsi_tgt_if.h

diff --git a/usr/scsi_tgt_if.h b/usr/scsi_tgt_if.h
new file mode 100644
index 0000000..f2ee7c2
--- /dev/null
+++ b/usr/scsi_tgt_if.h
@@ -0,0 +1,108 @@
+/*
+ * SCSI target kernel/user interface
+ *
+ * Copyright (C) 2005 FUJITA Tomonori <tomof at acm.org>
+ * Copyright (C) 2005 Mike Christie <michaelc at cs.wisc.edu>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+#ifndef __SCSI_TARGET_IF_H
+#define __SCSI_TARGET_IF_H
+
+/* user -> kernel */
+#define	TGT_UEVENT_CMD_RSP		0x0001
+#define	TGT_UEVENT_IT_NEXUS_RSP		0x0002
+#define	TGT_UEVENT_TSK_MGMT_RSP		0x0003
+
+/* kernel -> user */
+#define	TGT_KEVENT_CMD_REQ		0x1001
+#define	TGT_KEVENT_CMD_DONE		0x1002
+#define	TGT_KEVENT_IT_NEXUS_REQ		0x1003
+#define	TGT_KEVENT_TSK_MGMT_REQ		0x1004
+
+struct tgt_event_hdr {
+	uint16_t version;
+	uint16_t status;
+	uint16_t type;
+	uint16_t len;
+} __attribute__ ((aligned (sizeof(uint64_t))));
+
+struct tgt_event {
+	struct tgt_event_hdr hdr;
+
+	union {
+		/* user-> kernel */
+		struct {
+			int host_no;
+			int result;
+			aligned_u64 itn_id;
+			aligned_u64 tag;
+			aligned_u64 uaddr;
+			aligned_u64 sense_uaddr;
+			uint32_t len;
+			uint32_t sense_len;
+			uint8_t rw;
+		} cmd_rsp;
+		struct {
+			int host_no;
+			int result;
+			aligned_u64 itn_id;
+			aligned_u64 mid;
+		} tsk_mgmt_rsp;
+		struct {
+			__s32 host_no;
+			__s32 result;
+			aligned_u64 itn_id;
+			__u32 function;
+		} it_nexus_rsp;
+
+		/* kernel -> user */
+		struct {
+			int host_no;
+			uint32_t data_len;
+			aligned_u64 itn_id;
+			uint8_t scb[16];
+			uint8_t lun[8];
+			int attribute;
+			aligned_u64 tag;
+		} cmd_req;
+		struct {
+			int host_no;
+			int result;
+			aligned_u64 itn_id;
+			aligned_u64 tag;
+		} cmd_done;
+		struct {
+			int host_no;
+			int function;
+			aligned_u64 itn_id;
+			aligned_u64 tag;
+			uint8_t lun[8];
+			aligned_u64 mid;
+		} tsk_mgmt_req;
+		struct {
+			__s32 host_no;
+			__u32 function;
+			aligned_u64 itn_id;
+			__u32 max_cmds;
+			__u8 initiator_id[16];
+		} it_nexus_req;
+	} p;
+} __attribute__ ((aligned (sizeof(uint64_t))));
+
+#define TGT_RING_SIZE (1UL << 16)
+
+#endif
diff --git a/usr/tgtif.c b/usr/tgtif.c
index f29c11f..1a0764b 100644
--- a/usr/tgtif.c
+++ b/usr/tgtif.c
@@ -36,7 +36,7 @@
 #ifndef aligned_u64
 #define aligned_u64 uint64_t __attribute__((aligned(8)))
 #endif
-#include <scsi/scsi_tgt_if.h>
+#include "scsi_tgt_if.h"
 
 #include "list.h"
 #include "util.h"
-- 
1.6.5

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