i40iw: Do not retransmit MPA request after it is ACKed

The ACK packets for an MPA request are ignored and
the MPA request is retransmitted if the MPA reply
is late or missing. Fix this by checking ack_rcvd
variable before retransmitting a packet.

Fixes: f27b4746 ("i40iw: add connection management code")
Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/i40iw/i40iw_cm.c

@@ -1267,13 +1267,16 @@ static void i40iw_cm_timer_tick(unsigned long pass)
 			spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 			goto done;
 		}
-		cm_node->cm_core->stats_pkt_retrans++;
 		spin_unlock_irqrestore(&cm_node->retrans_list_lock, flags);
 
 		vsi = &cm_node->iwdev->vsi;
 		dev = cm_node->dev;
-		atomic_inc(&send_entry->sqbuf->refcount);
-		i40iw_puda_send_buf(vsi->ilq, send_entry->sqbuf);
+
+		if (!cm_node->ack_rcvd) {
+			atomic_inc(&send_entry->sqbuf->refcount);
+			i40iw_puda_send_buf(vsi->ilq, send_entry->sqbuf);
+			cm_node->cm_core->stats_pkt_retrans++;
+		}
 		spin_lock_irqsave(&cm_node->retrans_list_lock, flags);
 		if (send_entry->send_retrans) {
 			send_entry->retranscount--;
@@ -2181,6 +2184,7 @@ static struct i40iw_cm_node *i40iw_make_cm_node(
 	cm_node->cm_id = cm_info->cm_id;
 	ether_addr_copy(cm_node->loc_mac, netdev->dev_addr);
 	spin_lock_init(&cm_node->retrans_list_lock);
+	cm_node->ack_rcvd = false;
 
 	atomic_set(&cm_node->ref_count, 1);
 	/* associate our parent CM core */
@@ -2719,7 +2723,10 @@ static int i40iw_handle_ack_pkt(struct i40iw_cm_node *cm_node,
 		cm_node->tcp_cntxt.rem_ack_num = ntohl(tcph->ack_seq);
 		if (datasize) {
 			cm_node->tcp_cntxt.rcv_nxt = inc_sequence + datasize;
+			cm_node->ack_rcvd = false;
 			i40iw_handle_rcv_mpa(cm_node, rbuf);
+		} else {
+			cm_node->ack_rcvd = true;
 		}
 		break;
 	case I40IW_CM_STATE_LISTENING:

drivers/infiniband/hw/i40iw/i40iw_cm.h

@@ -360,6 +360,7 @@ struct i40iw_cm_node {
 
 	u8 pdata_buf[IETF_MAX_PRIV_DATA_LEN];
 	struct i40iw_kmem_info mpa_hdr;
+	bool ack_rcvd;
 };
 
 /* structure for client or CM to fill when making CM api calls. */