i40e: avoid divide by zero

In some weird circumstances with DCB enabled, the firmware can fail to
configure the VSI, leaving us with zero traffic classes. Check for this
state when we configure RSS to avoid a panic.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index e29d42c67fa9..db7dd812c1df 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -10783,8 +10783,13 @@ static int i40e_pf_config_rss(struct i40e_pf *pf)
         /* Determine the RSS size of the VSI */
         if (!vsi->rss_size) {
                 u16 qcount;
-
-                qcount = vsi->num_queue_pairs / vsi->tc_config.numtc;
+                /* If the firmware does something weird during VSI init, we
+                 * could end up with zero TCs. Check for that to avoid
+                 * divide-by-zero. It probably won't pass traffic, but it also
+                 * won't panic.
+                 */
+                qcount = vsi->num_queue_pairs /
+                         (vsi->tc_config.numtc ? vsi->tc_config.numtc : 1);
                 vsi->rss_size = min_t(int, pf->alloc_rss_size, qcount);
         }
         if (!vsi->rss_size)