[PATCH v2] net/ice: optimize max queue number calculation

[Qi Zhang]

Remove the limitation that max queue pair number must be 2^n.
With this patch, even on a 8 ports device, the max queue pair
number increased from 128 to 254.

Signed-off-by: Qi Zhang <qi.z.zh...@intel.com>
---

v2:
- fix check patch warning

 drivers/net/ice/ice_ethdev.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index 73e550f5fb..ff2b3e45d9 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -819,10 +819,26 @@ ice_vsi_config_tc_queue_mapping(struct ice_vsi *vsi,
                return -ENOTSUP;
        }
 
-       vsi->nb_qps = RTE_MIN(vsi->nb_qps, ICE_MAX_Q_PER_TC);
-       fls = (vsi->nb_qps == 0) ? 0 : rte_fls_u32(vsi->nb_qps) - 1;
-       /* Adjust the queue number to actual queues that can be applied */
-       vsi->nb_qps = (vsi->nb_qps == 0) ? 0 : 0x1 << fls;
+       /* vector 0 is reserved and 1 vector for ctrl vsi */
+       if (vsi->adapter->hw.func_caps.common_cap.num_msix_vectors < 2)
+               vsi->nb_qps = 0;
+       else
+               vsi->nb_qps = RTE_MIN
+                       
((uint16_t)vsi->adapter->hw.func_caps.common_cap.num_msix_vectors - 2,
+                       RTE_MIN(vsi->nb_qps, ICE_MAX_Q_PER_TC));
+
+       /* nb_qps(hex)  -> fls */
+       /* 0000         -> 0 */
+       /* 0001         -> 0 */
+       /* 0002         -> 1 */
+       /* 0003 ~ 0004  -> 2 */
+       /* 0005 ~ 0008  -> 3 */
+       /* 0009 ~ 0010  -> 4 */
+       /* 0011 ~ 0020  -> 5 */
+       /* 0021 ~ 0040  -> 6 */
+       /* 0041 ~ 0080  -> 7 */
+       /* 0081 ~ 0100  -> 8 */
+       fls = (vsi->nb_qps == 0) ? 0 : rte_fls_u32(vsi->nb_qps - 1);
 
        qp_idx = 0;
        /* Set tc and queue mapping with VSI */
-- 
2.26.2