i40e/i40evf: Use correct number of VF vectors

Now that the 2.4 firmware reports the correct number of MSI-X vectors,
use this value correctly when communicating with the VF, and when
setting up the interrupt linked list.

The PF has always reported the correct number of MSI-X vectors, so we
should never increment the value in the vf driver.

Change-ID: Ifeefc631c321390192219ce2af9ada6180c1492f
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 6 insertions, 5 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 42cc6ba88005..7839343b967b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -69,7 +69,7 @@ static inline bool i40e_vc_isvalid_vector_id(struct i40e_vf *vf, u8 vector_id)
 {
         struct i40e_pf *pf = vf->pf;
 
-        return vector_id <= pf->hw.func_caps.num_msix_vectors_vf;
+        return vector_id < pf->hw.func_caps.num_msix_vectors_vf;
 }
 
 /***********************vf resource mgmt routines*****************/
@@ -126,8 +126,8 @@ static void i40e_config_irq_link_list(struct i40e_vf *vf, u16 vsi_idx,
                 reg_idx = I40E_VPINT_LNKLST0(vf->vf_id);
         else
                 reg_idx = I40E_VPINT_LNKLSTN(
-                                           (pf->hw.func_caps.num_msix_vectors_vf
-                                              * vf->vf_id) + (vector_id - 1));
+                     ((pf->hw.func_caps.num_msix_vectors_vf - 1) * vf->vf_id) +
+                     (vector_id - 1));
 
         if (vecmap->rxq_map == 0 && vecmap->txq_map == 0) {
                 /* Special case - No queues mapped on this vector */
@@ -506,7 +506,8 @@ static void i40e_free_vf_res(struct i40e_vf *vf)
                 vf->lan_vsi_index = 0;
                 vf->lan_vsi_id = 0;
         }
-        msix_vf = pf->hw.func_caps.num_msix_vectors_vf + 1;
+        msix_vf = pf->hw.func_caps.num_msix_vectors_vf;
+
         /* disable interrupts so the VF starts in a known state */
         for (i = 0; i < msix_vf; i++) {
                 /* format is same for both registers */
diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index 11d0b61510b0..8daab3aacdc3 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -1141,7 +1141,7 @@ static int i40evf_set_interrupt_capability(struct i40evf_adapter *adapter)
          * (roughly) twice the number of vectors as there are CPU's.
          */
         v_budget = min(pairs, (int)(num_online_cpus() * 2)) + NONQ_VECS;
-        v_budget = min(v_budget, (int)adapter->vf_res->max_vectors + 1);
+        v_budget = min(v_budget, (int)adapter->vf_res->max_vectors);
 
         /* A failure in MSI-X entry allocation isn't fatal, but it does
          * mean we disable MSI-X capabilities of the adapter.