From a33b3f1ff69ac1886dcc8d23b71b1aeea4e1af5f Mon Sep 17 00:00:00 2001
From: Claudio Jeker <claudio@cvs.openbsd.org>
Date: Mon, 21 Apr 2014 09:48:32 +0000
Subject: Now that we properly negotiate the session params we can enable
 sending of immediate data for write commands. This gives a nice 20%
 performance boost on writes compared to the solicited data transaction we did
 before.

---
 usr.sbin/iscsid/iscsid.c | 12 +++++++++++-
 usr.sbin/iscsid/iscsid.h |  3 ++-
 usr.sbin/iscsid/vscsi.c  | 26 ++++++++++++++------------
 3 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/usr.sbin/iscsid/iscsid.c b/usr.sbin/iscsid/iscsid.c
index 08bcdfc35ff..df339323c24 100644
--- a/usr.sbin/iscsid/iscsid.c
+++ b/usr.sbin/iscsid/iscsid.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: iscsid.c,v 1.12 2014/04/20 22:18:04 claudio Exp $ */
+/*	$OpenBSD: iscsid.c,v 1.13 2014/04/21 09:48:31 claudio Exp $ */
 
 /*
  * Copyright (c) 2009 Claudio Jeker <claudio@openbsd.org>
@@ -269,6 +269,16 @@ iscsid_ctrl_dispatch(void *ch, struct pdu *pdu)
 		control_compose(ch, CTRL_VSCSI_STATS, vscsi_stats(),
 		    sizeof(struct vscsi_stats));
 		break;
+	case CTRL_SHOW_SUM:
+		control_compose(ch, CTRL_INITIATOR_CONFIG, &initiator->config,
+		    sizeof(initiator->config));
+
+		TAILQ_FOREACH(s, &initiator->sessions, entry)
+			control_compose(ch, CTRL_SESSION_CONFIG,
+			    &s->config, sizeof(s->config));
+
+		control_compose(ch, CTRL_SUCCESS, NULL, 0);
+		break;
 	default:
 		log_warnx("unknown control message type %d", cmh->type);
 		control_compose(ch, CTRL_FAILURE, NULL, 0);
diff --git a/usr.sbin/iscsid/iscsid.h b/usr.sbin/iscsid/iscsid.h
index 1bc123d0646..a530ada3f83 100644
--- a/usr.sbin/iscsid/iscsid.h
+++ b/usr.sbin/iscsid/iscsid.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: iscsid.h,v 1.11 2014/04/20 22:18:04 claudio Exp $ */
+/*	$OpenBSD: iscsid.h,v 1.12 2014/04/21 09:48:31 claudio Exp $ */
 
 /*
  * Copyright (c) 2009 Claudio Jeker <claudio@openbsd.org>
@@ -54,6 +54,7 @@ struct ctrlmsghdr {
 #define CTRL_SESSION_CONFIG	5
 #define CTRL_LOG_VERBOSE	6
 #define CTRL_VSCSI_STATS	7
+#define CTRL_SHOW_SUM		8
 
 
 TAILQ_HEAD(session_head, session);
diff --git a/usr.sbin/iscsid/vscsi.c b/usr.sbin/iscsid/vscsi.c
index 0dfafc5f777..4f796eb3845 100644
--- a/usr.sbin/iscsid/vscsi.c
+++ b/usr.sbin/iscsid/vscsi.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vscsi.c,v 1.10 2014/04/20 22:18:04 claudio Exp $ */
+/*	$OpenBSD: vscsi.c,v 1.11 2014/04/21 09:48:31 claudio Exp $ */
 
 /*
  * Copyright (c) 2009 Claudio Jeker <claudio@openbsd.org>
@@ -71,10 +71,6 @@ vscsi_dispatch(int fd, short event, void *arg)
 	struct session *s;
 	struct scsi_task *t;
 	struct pdu *p;
-#if 0
-	char *buf;
-	u_int32_t t32;
-#endif
 
 	if (!(event & EV_READ)) {
 		log_debug("spurious read call");
@@ -121,16 +117,22 @@ vscsi_dispatch(int fd, short event, void *arg)
 
 	memcpy(sreq->cdb, &i2t.cmd, i2t.cmdlen);
 
-#if 0
-	if (i2t.direction == VSCSI_DIR_WRITE) {
-		if (!(buf = pdu_alloc(i2t.datalen)))
+	/* include immediate data of up to FirstBurstLength bytes if allowed */
+	if (i2t.direction == VSCSI_DIR_WRITE &&
+	    s->active.ImmediateData) {
+		char *buf;
+		u_int32_t t32;
+		size_t size;
+
+		size = i2t.datalen > s->active.FirstBurstLength ?
+		    s->active.FirstBurstLength : i2t.datalen;
+		if (!(buf = pdu_alloc(size)))
 			fatal("vscsi_dispatch");
-		t32 = htonl(i2t.datalen);
+		t32 = htonl(size);
 		memcpy(&sreq->ahslen, &t32, sizeof(t32));
-		vscsi_data(VSCSI_DATA_WRITE, i2t.tag, buf, i2t.datalen);
-		pdu_addbuf(p, buf, i2t.datalen, PDU_DATA);
+		vscsi_data(VSCSI_DATA_WRITE, i2t.tag, buf, size);
+		pdu_addbuf(p, buf, size, PDU_DATA);
 	}
-#endif
 
 	task_init(&t->task, s, 0, t, vscsi_callback, vscsi_fail);
 	task_pdu_add(&t->task, p);
-- 
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