RDS: Set retry_count to 2 and make modifiable via modparam
This will be default cause IB connections to failover faster,
but allow a longer retry count to be used if desired.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/ib.c b/net/rds/ib.c
index b9bcd32..27abdd3 100644
--- a/net/rds/ib.c
+++ b/net/rds/ib.c
@@ -43,11 +43,14 @@
unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
+unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
module_param(fmr_pool_size, int, 0444);
MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
module_param(fmr_message_size, int, 0444);
MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
+module_param(rds_ib_retry_count, int, 0444);
+MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
struct list_head rds_ib_devices;
diff --git a/net/rds/ib.h b/net/rds/ib.h
index 455ae73..420afb9 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -15,6 +15,8 @@
#define RDS_IB_DEFAULT_RECV_WR 1024
#define RDS_IB_DEFAULT_SEND_WR 256
+#define RDS_IB_DEFAULT_RETRY_COUNT 2
+
#define RDS_IB_SUPPORTED_PROTOCOLS 0x00000003 /* minor versions supported */
extern struct list_head rds_ib_devices;
@@ -247,6 +249,7 @@
extern unsigned int fmr_pool_size;
extern unsigned int fmr_message_size;
+extern unsigned int rds_ib_retry_count;
extern spinlock_t ib_nodev_conns_lock;
extern struct list_head ib_nodev_conns;
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
index f8e40e1..605c032 100644
--- a/net/rds/ib_cm.c
+++ b/net/rds/ib_cm.c
@@ -145,7 +145,7 @@
/* XXX tune these? */
conn_param->responder_resources = 1;
conn_param->initiator_depth = 1;
- conn_param->retry_count = 7;
+ conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
conn_param->rnr_retry_count = 7;
if (dp) {
