i40e: Fix the number of queues available to be mapped for use

Fix the number of queues per enabled TC and report available queues
to the kernel without having to limit them to the max RSS limit so
they are available to be mapped for XPS. This allows a queue per
processing thread available for handling traffic for the given
traffic class.

Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index f95ce9b5e4fbea94ee32c374b4a3e545c82e87e0..e31adbc75f9ccde4b0da30be0817972ae7c7571b 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -1785,7 +1785,7 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi,
        struct i40e_pf *pf = vsi->back;
        u16 sections = 0;
        u8 netdev_tc = 0;
-       u16 numtc = 0;
+       u16 numtc = 1;
        u16 qcount;
        u8 offset;
        u16 qmap;
@@ -1795,9 +1795,11 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi,
        sections = I40E_AQ_VSI_PROP_QUEUE_MAP_VALID;
        offset = 0;
 
+       /* Number of queues per enabled TC */
+       num_tc_qps = vsi->alloc_queue_pairs;
        if (enabled_tc && (vsi->back->flags & I40E_FLAG_DCB_ENABLED)) {
                /* Find numtc from enabled TC bitmap */
-               for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
+               for (i = 0, numtc = 0; i < I40E_MAX_TRAFFIC_CLASS; i++) {
                        if (enabled_tc & BIT(i)) /* TC is enabled */
                                numtc++;
                }
@@ -1805,18 +1807,13 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi,
                        dev_warn(&pf->pdev->dev, "DCB is enabled but no TC enabled, forcing TC0\n");
                        numtc = 1;
                }
-       } else {
-               /* At least TC0 is enabled in non-DCB, non-MQPRIO case */
-               numtc = 1;
+               num_tc_qps = num_tc_qps / numtc;
+               num_tc_qps = min_t(int, num_tc_qps,
+                                  i40e_pf_get_max_q_per_tc(pf));
        }
 
        vsi->tc_config.numtc = numtc;
        vsi->tc_config.enabled_tc = enabled_tc ? enabled_tc : 1;
-       /* Number of queues per enabled TC */
-       qcount = vsi->alloc_queue_pairs;
-
-       num_tc_qps = qcount / numtc;
-       num_tc_qps = min_t(int, num_tc_qps, i40e_pf_get_max_q_per_tc(pf));
 
        /* Do not allow use more TC queue pairs than MSI-X vectors exist */
        if (pf->flags & I40E_FLAG_MSIX_ENABLED)
@@ -1831,9 +1828,13 @@ static void i40e_vsi_setup_queue_map(struct i40e_vsi *vsi,
 
                        switch (vsi->type) {
                        case I40E_VSI_MAIN:
-                               qcount = min_t(int, pf->alloc_rss_size,
-                                              num_tc_qps);
-                               break;
+                               if (!(pf->flags & (I40E_FLAG_FD_SB_ENABLED |
+                                   I40E_FLAG_FD_ATR_ENABLED)) ||
+                                   vsi->tc_config.enabled_tc != 1) {
+                                       qcount = min_t(int, pf->alloc_rss_size,
+                                                      num_tc_qps);
+                                       break;
+                               }
                        case I40E_VSI_FDIR:
                        case I40E_VSI_SRIOV:
                        case I40E_VSI_VMDQ2: