rds: RDS diagnostics when connections are stuck in Receiver Not Ready state.

    Orabug:26522310
    Enhance diagnosabilty,when an RDS IB/CM connection gets into
    "Receiver Not Ready" state.These are the data added to the
    per-RDS/IB connection info that is currently displayed through
    rds-info:
    - w_alloc_ctr of the receive ring (struct rds_ib_work_ring)
    - w_free_ctr
    - qp_num number of the connection

Signed-off-by: hui.han <[email protected]>

Reviewed-by: Venkat Venkatsubra <[email protected]>

Orabug: 27364391

(cherry picked from commit 708e107)
cherry-pick-repo=linux-uek.git

Signed-off-by: Gerd Rausch <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Author: linuxhuihan

include/uapi/linux/rds.h

@@ -245,6 +245,10 @@ struct rds_info_rdma_connection {
 	uint32_t	frag;
 	uint16_t        flow_ctl_post_credit;
 	uint16_t        flow_ctl_send_credit;
+	uint32_t        qp_num;
+	uint32_t        w_alloc_ctr;
+	uint32_t        w_free_ctr;
+
 };
 
 /*

net/rds/ib.c

@@ -377,6 +377,9 @@ static int rds_ib_conn_info_visitor(struct rds_connection *conn,
 		iinfo->max_send_wr = ic->i_send_ring.w_nr;
 		iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
 		iinfo->max_send_sge = rds_ibdev->max_sge;
+		iinfo->qp_num = ic->i_cm_id->qp->qp_num;
+		iinfo->w_alloc_ctr = ic->i_recv_ring.w_alloc_ctr;
+		iinfo->w_free_ctr  = (u32) atomic_read(&ic->i_recv_ring.w_free_ctr);
 		iinfo->flow_ctl_post_credit =
 			IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
 		iinfo->flow_ctl_send_credit =