net/i40e: fix division by 0

In function i40e_vsi_config_tc_queue_mapping(), if 'enabled_tcmap' is 0,
'total_tc' might be 0. Then 'total_tc' might be used in a division
by 0 in "qpnum_per_tc = i40e_align_floor(vsi->nb_qps / total_tc)".

Fix it by changing 'total_tc' from 0 to 1 just as func
i40e_vsi_update_queue_mapping() does.

Fixes: 4861cde46116 ("i40e: new poll mode driver")
Cc: stable@dpdk.org
Signed-off-by: Yong Wang <wang.yong19@zte.com.cn>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 2823d08..245d7ac 100644 (file)
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -4307,6 +4307,8 @@ i40e_vsi_config_tc_queue_mapping(struct i40e_vsi *vsi,
        for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++)
                if (enabled_tcmap & (1 << i))
                        total_tc++;
+       if (total_tc == 0)
+               total_tc = 1;
        vsi->enabled_tc = enabled_tcmap;
 
        /* Number of queues per enabled TC */