i40e: Changes to Interrupt distribution policy

This patch changes the way resources are distributed to special features.

Change-ID: I847e49d714a1d70e97f3f994cb39bfb5e02ab016
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index afc37d3..eb32c5c 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -6228,6 +6228,16 @@ static int i40e_init_msix(struct i40e_pf *pf)
        for (i = 0; i < v_budget; i++)
                pf->msix_entries[i].entry = i;
        vec = i40e_reserve_msix_vectors(pf, v_budget);
+
+       if (vec != v_budget) {
+               /* If we have limited resources, we will start with no vectors
+                * for the special features and then allocate vectors to some
+                * of these features based on the policy and at the end disable
+                * the features that did not get any vectors.
+                */
+               pf->num_vmdq_msix = 0;
+       }
+
        if (vec < I40E_MIN_MSIX) {
                pf->flags &= ~I40E_FLAG_MSIX_ENABLED;
                kfree(pf->msix_entries);
@@ -6236,27 +6246,25 @@ static int i40e_init_msix(struct i40e_pf *pf)
 
        } else if (vec == I40E_MIN_MSIX) {
                /* Adjust for minimal MSIX use */
-               dev_info(&pf->pdev->dev, "Features disabled, not enough MSI-X vectors\n");
-               pf->flags &= ~I40E_FLAG_VMDQ_ENABLED;
                pf->num_vmdq_vsis = 0;
                pf->num_vmdq_qps = 0;
-               pf->num_vmdq_msix = 0;
                pf->num_lan_qps = 1;
                pf->num_lan_msix = 1;
 
        } else if (vec != v_budget) {
+               /* reserve the misc vector */
+               vec--;
+
                /* Scale vector usage down */
                pf->num_vmdq_msix = 1;    /* force VMDqs to only one vector */
-               vec--;                    /* reserve the misc vector */
+               pf->num_vmdq_vsis = 1;
 
                /* partition out the remaining vectors */
                switch (vec) {
                case 2:
-                       pf->num_vmdq_vsis = 1;
                        pf->num_lan_msix = 1;
                        break;
                case 3:
-                       pf->num_vmdq_vsis = 1;
                        pf->num_lan_msix = 2;
                        break;
                default:
@@ -6268,6 +6276,11 @@ static int i40e_init_msix(struct i40e_pf *pf)
                }
        }
 
+       if ((pf->flags & I40E_FLAG_VMDQ_ENABLED) &&
+           (pf->num_vmdq_msix == 0)) {
+               dev_info(&pf->pdev->dev, "VMDq disabled, not enough MSI-X vectors\n");
+               pf->flags &= ~I40E_FLAG_VMDQ_ENABLED;
+       }
        return err;
 }