Use pass through interface for sendtargets (take4) Currenly offload cards like bnx2i, be2iscsi, cxgb3i must use a normal eth for discovery. This patch allows us to do discovery using the iscsi class passthrough interface.

Note1 that the dirver must set the CAP_TEXT_NEGO setting, which
might requires scsi-misc.

Limitations of patch:
- MaxRecvDataSegmentLength is limited to 8K for discovery sessions
when offload is used.

V3:
- bug fixes from Eddie Wai to call start conn after we have logged in.
Fixed set param not setting all settings.
Misc cleanups.
V4:
- fix iscsistart segfault due to missing initialization.

1 files changed, 86 insertions, 0 deletions

diff --git a/usr/iscsi_timer.c b/usr/iscsi_timer.c
new file mode 100644
index 0000000..de38286
--- /dev/null
+++ b/usr/iscsi_timer.c
@@ -0,0 +1,86 @@
+/*
+ * iSCSI timer
+ *
+ * Copyright (C) 2002 Cisco Systems, Inc.
+ *
+ * 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.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+#include <string.h>
+#include <sys/time.h>
+
+void iscsi_timer_clear(struct timeval *timer)
+{
+	memset(timer, 0, sizeof (*timer));
+}
+
+/* set timer to now + seconds */
+void iscsi_timer_set(struct timeval *timer, int seconds)
+{
+	if (timer) {
+		memset(timer, 0, sizeof (*timer));
+		gettimeofday(timer, NULL);
+
+		timer->tv_sec += seconds;
+	}
+}
+
+int iscsi_timer_expired(struct timeval *timer)
+{
+	struct timeval now;
+
+	/* no timer, can't have expired */
+	if ((timer == NULL) || ((timer->tv_sec == 0) && (timer->tv_usec == 0)))
+		return 0;
+
+	memset(&now, 0, sizeof (now));
+	gettimeofday(&now, NULL);
+
+	if (now.tv_sec > timer->tv_sec)
+		return 1;
+	if ((now.tv_sec == timer->tv_sec) && (now.tv_usec >= timer->tv_usec))
+		return 1;
+	return 0;
+}
+
+int iscsi_timer_msecs_until(struct timeval *timer)
+{
+	struct timeval now;
+	int msecs;
+	long partial;
+
+	/* no timer, can't have expired, infinite time til it expires */
+	if ((timer == NULL) || ((timer->tv_sec == 0) && (timer->tv_usec == 0)))
+		return -1;
+
+	memset(&now, 0, sizeof (now));
+	gettimeofday(&now, NULL);
+
+	/* already expired? */
+	if (now.tv_sec > timer->tv_sec)
+		return 0;
+	if ((now.tv_sec == timer->tv_sec) && (now.tv_usec >= timer->tv_usec))
+		return 0;
+
+	/* not expired yet, do the math */
+	partial = timer->tv_usec - now.tv_usec;
+	if (partial < 0) {
+		partial += 1000 * 1000;
+		msecs = (partial + 500) / 1000;
+		msecs += (timer->tv_sec - now.tv_sec - 1) * 1000;
+	} else {
+		msecs = (partial + 500) / 1000;
+		msecs += (timer->tv_sec - now.tv_sec) * 1000;
+	}
+
+	return msecs;
+}