i40e: Fix interface init with MSI interrupts (no MSI-X)

[ Upstream commit 5fcbb711024aac6d4db385623e6f2fdf019f7782 ]

Fix the inability to bring an interface up on a setup with
only MSI interrupts enabled (no MSI-X).
Solution is to add a default number of QPs = 1. This is enough,
since without MSI-X support driver enables only a basic feature set.

Fixes: bc6d33c8d93f ("i40e: Fix the number of queues available to be mapped for use")
Signed-off-by: Dawid Lukwinski <dawid.lukwinski@intel.com>
Signed-off-by: Michal Maloszewski <michal.maloszewski@intel.com>
Tested-by: Dave Switzer <david.switzer@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://lore.kernel.org/r/20220722175401.112572-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index c801b12..b07d55c 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -1908,11 +1908,15 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi,
                 * non-zero req_queue_pairs says that user requested a new
                 * queue count via ethtool's set_channels, so use this
                 * value for queues distribution across traffic classes
+                * We need at least one queue pair for the interface
+                * to be usable as we see in else statement.
                 */
                if (vsi->req_queue_pairs > 0)
                        vsi->num_queue_pairs = vsi->req_queue_pairs;
                else if (pf->flags & I40E_FLAG_MSIX_ENABLED)
                        vsi->num_queue_pairs = pf->num_lan_msix;
+               else
+                       vsi->num_queue_pairs = 1;
        }
 
        /* Number of queues per enabled TC */