[dpdk-stable] [PATCH 17.11] net/bonding: fix reset active slave

[Rybalchenko, Kirill]

From: Hari Kumar Vemula <hari.kumarx.vemula at intel.com>

[ backported from upstream commit 7f949ae391527200266afa59097317ef0047111e ]

test_alb_reply_from_client test fails due to incorrect active slave array's index. This was due to invalid active slave count.

Count of internals->active_slave is not updated even when active slave is deactivated.
Hence active slave count always keeps incrementing beyond the actual active slaves.

Fix is to set the internals->active_slave to starting index 0 whenever it exceeds the number of slaves in active slave list and also update the active slave count during slave de-activation.

Fixes: e1110e977648 ("net/bonding: fix Rx slave fairness")
Cc: stable at dpdk.org

Signed-off-by: Hari Kumar Vemula <hari.kumarx.vemula at intel.com>
Acked-by: Radu Nicolau <radu.nicolau at intel.com
Acked-by: Chas Williams <chas3 at att.com>
---
 drivers/net/bonding/rte_eth_bond_api.c | 6 ++++++  drivers/net/bonding/rte_eth_bond_pmd.c | 6 +++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_api.c b/drivers/net/bonding/rte_eth_bond_api.c
index f4ca0a3..5f46dff 100644
--- a/drivers/net/bonding/rte_eth_bond_api.c
+++ b/drivers/net/bonding/rte_eth_bond_api.c
@@ -158,6 +158,12 @@ deactivate_slave(struct rte_eth_dev *eth_dev, uint16_t port_id)
        RTE_ASSERT(active_count < RTE_DIM(internals->active_slaves));
        internals->active_slave_count = active_count;

+       /* Resetting active_slave when reaches to max
+        * no of slaves in active list
+        */
+       if (internals->active_slave >= active_count)
+               internals->active_slave = 0;
+
        if (eth_dev->data->dev_started) {
                if (internals->mode == BONDING_MODE_8023AD) {
                        bond_mode_8023ad_start(eth_dev); diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index 44cf61b..410f9d5 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -111,7 +111,7 @@ bond_ethdev_rx_burst(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
                        active_slave = 0;
        }

-       if (++internals->active_slave == slave_count)
+       if (++internals->active_slave >= slave_count)
                internals->active_slave = 0;
        return num_rx_total;
 }
@@ -315,7 +315,7 @@ bond_ethdev_rx_burst_8023ad_fast_queue(void *queue, struct rte_mbuf **bufs,
                        active_slave = 0;
        }

-       if (++internals->active_slave == slave_count)
+       if (++internals->active_slave >= slave_count)
                internals->active_slave = 0;

        return num_rx_total;
@@ -494,7 +494,7 @@ bond_ethdev_rx_burst_8023ad(void *queue, struct rte_mbuf **bufs,
                        idx = 0;
        }

-       if (++internals->active_slave == slave_count)
+       if (++internals->active_slave >= slave_count)
                internals->active_slave = 0;

        return num_rx_total;
--
2.7.4