RDS/IW+IB: Allow max credit advertise window.

Fix hack that restricts the credit advertisement to 127.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

7 files changed, 13 insertions, 13 deletions

diff --git a/net/rds/ib.h b/net/rds/ib.h
index 069206cae733..455ae73047fe 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -333,7 +333,7 @@ int rds_ib_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
-                             u32 *adv_credits, int need_posted);
+                             u32 *adv_credits, int need_posted, int max_posted);
 
 /* ib_stats.c */
 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c
index 36d931573ff4..5709bad28329 100644
--- a/net/rds/ib_recv.c
+++ b/net/rds/ib_recv.c
@@ -524,7 +524,7 @@ void rds_ib_attempt_ack(struct rds_ib_connection *ic)
         }
 
         /* Can we get a send credit? */
-        if (!rds_ib_send_grab_credits(ic, 1, &adv_credits, 0)) {
+        if (!rds_ib_send_grab_credits(ic, 1, &adv_credits, 0, RDS_MAX_ADV_CREDIT)) {
                 rds_ib_stats_inc(s_ib_tx_throttle);
                 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
                 return;
diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index fa684b7fc748..23bf830db2d5 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -311,7 +311,7 @@ void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context)
  * and using atomic_cmpxchg when updating the two counters.
  */
 int rds_ib_send_grab_credits(struct rds_ib_connection *ic,
-                             u32 wanted, u32 *adv_credits, int need_posted)
+                             u32 wanted, u32 *adv_credits, int need_posted, int max_posted)
 {
         unsigned int avail, posted, got = 0, advertise;
         long oldval, newval;
@@ -351,7 +351,7 @@ try_again:
          * available.
          */
         if (posted && (got || need_posted)) {
-                advertise = min_t(unsigned int, posted, RDS_MAX_ADV_CREDIT);
+                advertise = min_t(unsigned int, posted, max_posted);
                 newval -= IB_SET_POST_CREDITS(advertise);
         }
 
@@ -498,7 +498,7 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 
         credit_alloc = work_alloc;
         if (ic->i_flowctl) {
-                credit_alloc = rds_ib_send_grab_credits(ic, work_alloc, &posted, 0);
+                credit_alloc = rds_ib_send_grab_credits(ic, work_alloc, &posted, 0, RDS_MAX_ADV_CREDIT);
                 adv_credits += posted;
                 if (credit_alloc < work_alloc) {
                         rds_ib_ring_unalloc(&ic->i_send_ring, work_alloc - credit_alloc);
@@ -571,7 +571,7 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
                 /*
                  * Update adv_credits since we reset the ACK_REQUIRED bit.
                  */
-                rds_ib_send_grab_credits(ic, 0, &posted, 1);
+                rds_ib_send_grab_credits(ic, 0, &posted, 1, RDS_MAX_ADV_CREDIT - adv_credits);
                 adv_credits += posted;
                 BUG_ON(adv_credits > 255);
         } else if (ic->i_rm != rm)
diff --git a/net/rds/iw.h b/net/rds/iw.h
index b4fb27252895..0715dde323e7 100644
--- a/net/rds/iw.h
+++ b/net/rds/iw.h
@@ -361,7 +361,7 @@ int rds_iw_xmit_rdma(struct rds_connection *conn, struct rds_rdma_op *op);
 void rds_iw_send_add_credits(struct rds_connection *conn, unsigned int credits);
 void rds_iw_advertise_credits(struct rds_connection *conn, unsigned int posted);
 int rds_iw_send_grab_credits(struct rds_iw_connection *ic, u32 wanted,
-                             u32 *adv_credits, int need_posted);
+                             u32 *adv_credits, int need_posted, int max_posted);
 
 /* ib_stats.c */
 DECLARE_PER_CPU(struct rds_iw_statistics, rds_iw_stats);
diff --git a/net/rds/iw_recv.c b/net/rds/iw_recv.c
index fde470fa50d5..8683f5f66c4b 100644
--- a/net/rds/iw_recv.c
+++ b/net/rds/iw_recv.c
@@ -524,7 +524,7 @@ void rds_iw_attempt_ack(struct rds_iw_connection *ic)
         }
 
         /* Can we get a send credit? */
-        if (!rds_iw_send_grab_credits(ic, 1, &adv_credits, 0)) {
+        if (!rds_iw_send_grab_credits(ic, 1, &adv_credits, 0, RDS_MAX_ADV_CREDIT)) {
                 rds_iw_stats_inc(s_iw_tx_throttle);
                 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
                 return;
diff --git a/net/rds/iw_send.c b/net/rds/iw_send.c
index 626290bc7e97..44a6a0551f28 100644
--- a/net/rds/iw_send.c
+++ b/net/rds/iw_send.c
@@ -347,7 +347,7 @@ void rds_iw_send_cq_comp_handler(struct ib_cq *cq, void *context)
  * and using atomic_cmpxchg when updating the two counters.
  */
 int rds_iw_send_grab_credits(struct rds_iw_connection *ic,
-                             u32 wanted, u32 *adv_credits, int need_posted)
+                             u32 wanted, u32 *adv_credits, int need_posted, int max_posted)
 {
         unsigned int avail, posted, got = 0, advertise;
         long oldval, newval;
@@ -387,7 +387,7 @@ try_again:
          * available.
          */
         if (posted && (got || need_posted)) {
-                advertise = min_t(unsigned int, posted, RDS_MAX_ADV_CREDIT);
+                advertise = min_t(unsigned int, posted, max_posted);
                 newval -= IB_SET_POST_CREDITS(advertise);
         }
 
@@ -541,7 +541,7 @@ int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm,
 
         credit_alloc = work_alloc;
         if (ic->i_flowctl) {
-                credit_alloc = rds_iw_send_grab_credits(ic, work_alloc, &posted, 0);
+                credit_alloc = rds_iw_send_grab_credits(ic, work_alloc, &posted, 0, RDS_MAX_ADV_CREDIT);
                 adv_credits += posted;
                 if (credit_alloc < work_alloc) {
                         rds_iw_ring_unalloc(&ic->i_send_ring, work_alloc - credit_alloc);
@@ -614,7 +614,7 @@ int rds_iw_xmit(struct rds_connection *conn, struct rds_message *rm,
                 /*
                  * Update adv_credits since we reset the ACK_REQUIRED bit.
                  */
-                rds_iw_send_grab_credits(ic, 0, &posted, 1);
+                rds_iw_send_grab_credits(ic, 0, &posted, 1, RDS_MAX_ADV_CREDIT - adv_credits);
                 adv_credits += posted;
                 BUG_ON(adv_credits > 255);
         } else if (ic->i_rm != rm)
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 619f0a30a4e5..1f82ec0d2066 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -132,7 +132,7 @@ struct rds_connection {
 #define RDS_FLAG_CONG_BITMAP    0x01
 #define RDS_FLAG_ACK_REQUIRED   0x02
 #define RDS_FLAG_RETRANSMITTED  0x04
-#define RDS_MAX_ADV_CREDIT      127
+#define RDS_MAX_ADV_CREDIT      255
 
 /*
  * Maximum space available for extension headers.