[Qemu-devel] [PATCH] iscsi: add support for iSCSI NOPs

[Peter Lieven <pl@dlhnet.de>]

This patch will send NOP-Out PDUs every 5 seconds to the iSCSI target.
If a consecutive number of NOP-In replies fail a reconnect is initiated.
iSCSI NOPs help to ensure that the connection to the target is still operational.
This should not, but in reality may be the case even if the TCP connection is still
alive if there are bugs in either the target or the initiator implementation.

Reported-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
---
 block/iscsi.c |   43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/block/iscsi.c b/block/iscsi.c
index d0b1a10..fab4c8b 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -47,6 +47,9 @@ typedef struct IscsiLun {
     int block_size;
     uint64_t num_blocks;
     int events;
+
+    QEMUTimer *nop_timer;
+    int nops_in_flight;
 } IscsiLun;
 
 typedef struct IscsiAIOCB {
@@ -72,6 +75,9 @@ struct IscsiTask {
     int complete;
 };
 
+#define NOP_INTERVAL 5000
+#define MAX_NOP_FAILURES 3
+
 static void
 iscsi_bh_cb(void *p)
 {
@@ -925,6 +931,35 @@ static char *parse_initiator_name(const char *target)
     }
 }
 
+static void iscsi_nop_cb(struct iscsi_context *iscsi, int status, void *command_data, void *private_data)
+{
+    IscsiLun *iscsilun = private_data;
+
+    if (iscsilun) {
+        iscsilun->nops_in_flight = 0;
+    }
+}
+
+static void iscsi_nop_timed_event(void *opaque)
+{
+    IscsiLun *iscsilun = opaque;
+
+    if (iscsilun->nops_in_flight > MAX_NOP_FAILURES) {
+        error_report("iSCSI: NOP timeout. Reconnecting...");
+        iscsi_reconnect(iscsilun->iscsi);
+        iscsilun->nops_in_flight = 0;
+    }
+
+    if (iscsi_nop_out_async(iscsilun->iscsi, iscsi_nop_cb, NULL, 0, iscsilun) != 0) {
+        error_report("iSCSI: failed to sent NOP-Out. Disabling NOP messages.");
+        return;
+    }
+
+    qemu_mod_timer(iscsilun->nop_timer, qemu_get_clock_ms(rt_clock) + NOP_INTERVAL);
+    iscsi_set_events(iscsilun);
+    iscsilun->nops_in_flight++;
+}
+
 /*
  * We support iscsi url's on the form
  * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
@@ -1036,6 +1071,10 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
 
     ret = 0;
 
+    /* Set up a timer for sending out iSCSI NOPs */
+    iscsilun->nop_timer = qemu_new_timer_ms(rt_clock, iscsi_nop_timed_event, iscsilun);
+    qemu_mod_timer(iscsilun->nop_timer, qemu_get_clock_ms(rt_clock) + NOP_INTERVAL);
+
 out:
     if (initiator_name != NULL) {
         g_free(initiator_name);
@@ -1058,6 +1097,10 @@ static void iscsi_close(BlockDriverState *bs)
     IscsiLun *iscsilun = bs->opaque;
     struct iscsi_context *iscsi = iscsilun->iscsi;
 
+    if (iscsilun->nop_timer) {
+        qemu_del_timer(iscsilun->nop_timer);
+        qemu_free_timer(iscsilun->nop_timer);
+    }
     qemu_aio_set_fd_handler(iscsi_get_fd(iscsi), NULL, NULL, NULL, NULL);
     iscsi_destroy_context(iscsi);
     memset(iscsilun, 0, sizeof(IscsiLun));
-- 
1.7.9.5