RDS: IB: add few useful cache stasts

Tracks the ib receive cache total, incoming and frag allocations.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>

net/rds/ib.h

@@ -151,6 +151,7 @@ struct rds_ib_connection {
 	u64			i_ack_recv;	/* last ACK received */
 	struct rds_ib_refill_cache i_cache_incs;
 	struct rds_ib_refill_cache i_cache_frags;
+	atomic_t		i_cache_allocs;
 
 	/* sending acks */
 	unsigned long		i_ack_flags;
@@ -254,6 +255,8 @@ struct rds_ib_statistics {
 	uint64_t	s_ib_rx_refill_from_cq;
 	uint64_t	s_ib_rx_refill_from_thread;
 	uint64_t	s_ib_rx_alloc_limit;
+	uint64_t	s_ib_rx_total_frags;
+	uint64_t	s_ib_rx_total_incs;
 	uint64_t	s_ib_rx_credit_updates;
 	uint64_t	s_ib_ack_sent;
 	uint64_t	s_ib_ack_send_failure;
@@ -276,6 +279,8 @@ struct rds_ib_statistics {
 	uint64_t	s_ib_rdma_mr_1m_reused;
 	uint64_t	s_ib_atomic_cswp;
 	uint64_t	s_ib_atomic_fadd;
+	uint64_t	s_ib_recv_added_to_cache;
+	uint64_t	s_ib_recv_removed_from_cache;
 };
 
 extern struct workqueue_struct *rds_ib_wq;
@@ -406,6 +411,8 @@ int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 /* ib_stats.c */
 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
+#define rds_ib_stats_add(member, count) \
+		rds_stats_add_which(rds_ib_stats, member, count)
 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 				    unsigned int avail);