net/bonding: fix slave Tx burst for mode 4

The Tx burst routine always needs to check for pending LACPDUs
and send them if available. Do this first to prioritize the
control traffic.  We can still early exit, before calculating
the distribution slaves, if there isn't any data packets.

Fixes: 09150784a776 ("net/bonding: burst mode hash calculation")
Cc: stable@dpdk.org
Reported-by: Hui Zhao <zhaohui8@huawei.com>
Signed-off-by: Chas Williams <chas3@att.com>

diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index 2304172..61e731a 100644 (file)
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -1298,9 +1298,6 @@ bond_ethdev_tx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
 
        uint16_t i;
 
-       if (unlikely(nb_bufs == 0))
-               return 0;
-
        /* Copy slave list to protect against slave up/down changes during tx
         * bursting */
        slave_count = internals->active_slave_count;
@@ -1310,6 +1307,30 @@ bond_ethdev_tx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
        memcpy(slave_port_ids, internals->active_slaves,
                        sizeof(slave_port_ids[0]) * slave_count);
 
+       /* Check for LACP control packets and send if available */
+       for (i = 0; i < slave_count; i++) {
+               struct port *port = &bond_mode_8023ad_ports[slave_port_ids[i]];
+               struct rte_mbuf *ctrl_pkt = NULL;
+
+               if (likely(rte_ring_empty(port->tx_ring)))
+                       continue;
+
+               if (rte_ring_dequeue(port->tx_ring,
+                                    (void **)&ctrl_pkt) != -ENOENT) {
+                       slave_tx_count = rte_eth_tx_burst(slave_port_ids[i],
+                                       bd_tx_q->queue_id, &ctrl_pkt, 1);
+                       /*
+                        * re-enqueue LAG control plane packets to buffering
+                        * ring if transmission fails so the packet isn't lost.
+                        */
+                       if (slave_tx_count != 1)
+                               rte_ring_enqueue(port->tx_ring, ctrl_pkt);
+               }
+       }
+
+       if (unlikely(nb_bufs == 0))
+               return 0;
+
        dist_slave_count = 0;
        for (i = 0; i < slave_count; i++) {
                struct port *port = &bond_mode_8023ad_ports[slave_port_ids[i]];
@@ -1365,27 +1386,6 @@ bond_ethdev_tx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
                }
        }
 
-       /* Check for LACP control packets and send if available */
-       for (i = 0; i < slave_count; i++) {
-               struct port *port = &bond_mode_8023ad_ports[slave_port_ids[i]];
-               struct rte_mbuf *ctrl_pkt = NULL;
-
-               if (likely(rte_ring_empty(port->tx_ring)))
-                       continue;
-
-               if (rte_ring_dequeue(port->tx_ring,
-                                    (void **)&ctrl_pkt) != -ENOENT) {
-                       slave_tx_count = rte_eth_tx_burst(slave_port_ids[i],
-                                       bd_tx_q->queue_id, &ctrl_pkt, 1);
-                       /*
-                        * re-enqueue LAG control plane packets to buffering
-                        * ring if transmission fails so the packet isn't lost.
-                        */
-                       if (slave_tx_count != 1)
-                               rte_ring_enqueue(port->tx_ring, ctrl_pkt);
-               }
-       }
-
        return total_tx_count;
 }