[dpdk-dev] [PATCH 4/4] net/bonding: fix configuration of LACP slaves

[Robert Sanford]

Problem: When adding a slave or starting a bond device, the bond
device configures slave devices via function slave_configure().
However, settings configured in the bond device's rte_eth_conf are
not propagated to the slaves. For example, VLAN and CRC stripping
are not working as expected.

The problem is that we pass the wrong argument when we invoke
rte_eth_dev_configure(). We pass the slave's currently configured
rte_eth_conf (as a source arg!), when we should pass a copy of the
(master) bond device's rte_eth_conf.

Solution: Make a local copy of the bond device's rte_eth_conf, adjust
the LSC flag based on the slave, and then pass that rte_eth_conf to
rte_eth_dev_configure().

Also, remove code that directly pokes RSS data into the slave's
rte_eth_conf, as that is also contained in the proper rte_eth_conf
that we will pass to rte_eth_dev_configure().

Signed-off-by: Robert Sanford <rsanford at akamai.com>
---
 drivers/net/bonding/rte_eth_bond_pmd.c |   28 +++++++---------------------
 1 files changed, 7 insertions(+), 21 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index b20a272..486582f 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -1302,6 +1302,7 @@ int
 slave_configure(struct rte_eth_dev *bonded_eth_dev,
 		struct rte_eth_dev *slave_eth_dev)
 {
+	struct rte_eth_conf slave_eth_conf;
 	struct bond_rx_queue *bd_rx_q;
 	struct bond_tx_queue *bd_tx_q;
 
@@ -1313,33 +1314,18 @@ slave_configure(struct rte_eth_dev *bonded_eth_dev,
 	/* Stop slave */
 	rte_eth_dev_stop(slave_eth_dev->data->port_id);
 
-	/* Enable interrupts on slave device if supported */
-	if (slave_eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
-		slave_eth_dev->data->dev_conf.intr_conf.lsc = 1;
-
-	/* If RSS is enabled for bonding, try to enable it for slaves  */
-	if (bonded_eth_dev->data->dev_conf.rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG) {
-		if (bonded_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key_len
-				!= 0) {
-			slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key_len =
-					bonded_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key_len;
-			slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key =
-					bonded_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key;
-		} else {
-			slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_key = NULL;
-		}
+	/* Build slave rte_eth_conf, starting from bonded's conf */
+	slave_eth_conf = bonded_eth_dev->data->dev_conf;
 
-		slave_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf =
-				bonded_eth_dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf;
-		slave_eth_dev->data->dev_conf.rxmode.mq_mode =
-				bonded_eth_dev->data->dev_conf.rxmode.mq_mode;
-	}
+	/* Enable interrupts on slave device if supported */
+	slave_eth_conf.intr_conf.lsc =
+		!!(slave_eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC);
 
 	/* Configure device */
 	errval = rte_eth_dev_configure(slave_eth_dev->data->port_id,
 			bonded_eth_dev->data->nb_rx_queues,
 			bonded_eth_dev->data->nb_tx_queues,
-			&(slave_eth_dev->data->dev_conf));
+			&slave_eth_conf);
 	if (errval != 0) {
 		RTE_BOND_LOG(ERR, "Cannot configure slave device: port %u , err (%d)",
 				slave_eth_dev->data->port_id, errval);
-- 
1.7.1