i40e: Fix errors resulted while turning off TSO

On systems with 128 CPUs, turning off TSO results in errors,

i40e 0000:03:00.0: failed to get tracking for 1 vectors for VSI 400, err=-12
i40e 0000:03:00.0: Couldn't create FDir VSI
i40e 0000:03:00.0: i40e_ptp_init: PTP not supported on eth0
i40e 0000:03:00.0: couldn't add VEB, err I40E_ERR_ADMIN_QUEUE_ERROR aq_err I40E_AQ_RC_ENOENT
i40e 0000:03:00.0: rebuild of switch failed: -1, will try to set up simple PF connection
i40e 0000:03:00.0 eth0: adding 00:10:e0:8a:24:b6 vid=0

Enabling FD_SB without checking availability of MSI-X vector is the
root cause. This change adds necessary check.

Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 9c44739..e83fc8a 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -283,6 +283,7 @@ struct i40e_pf {
 #endif /* I40E_FCOE */
        u16 num_lan_qps;           /* num lan queues this PF has set up */
        u16 num_lan_msix;          /* num queue vectors for the base PF vsi */
+       u16 num_fdsb_msix;         /* num queue vectors for sideband Fdir */
        u16 num_iwarp_msix;        /* num of iwarp vectors for this PF */
        int iwarp_base_vector;
        int queues_left;           /* queues left unclaimed */

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 3e394bf..a313194 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -7185,7 +7185,7 @@ static int i40e_set_num_rings_in_vsi(struct i40e_vsi *vsi)
                vsi->alloc_queue_pairs = 1;
                vsi->num_desc = ALIGN(I40E_FDIR_RING_COUNT,
                                      I40E_REQ_DESCRIPTOR_MULTIPLE);
-               vsi->num_q_vectors = 1;
+               vsi->num_q_vectors = pf->num_fdsb_msix;
                break;
 
        case I40E_VSI_VMDQ2:
@@ -7569,9 +7569,11 @@ static int i40e_init_msix(struct i40e_pf *pf)
        /* reserve one vector for sideband flow director */
        if (pf->flags & I40E_FLAG_FD_SB_ENABLED) {
                if (vectors_left) {
+                       pf->num_fdsb_msix = 1;
                        v_budget++;
                        vectors_left--;
                } else {
+                       pf->num_fdsb_msix = 0;
                        pf->flags &= ~I40E_FLAG_FD_SB_ENABLED;
                }
        }
@@ -8590,7 +8592,9 @@ bool i40e_set_ntuple(struct i40e_pf *pf, netdev_features_t features)
                /* Enable filters and mark for reset */
                if (!(pf->flags & I40E_FLAG_FD_SB_ENABLED))
                        need_reset = true;
-               pf->flags |= I40E_FLAG_FD_SB_ENABLED;
+               /* enable FD_SB only if there is MSI-X vector */
+               if (pf->num_fdsb_msix > 0)
+                       pf->flags |= I40E_FLAG_FD_SB_ENABLED;
        } else {
                /* turn off filters, mark for reset and clear SW filter list */
                if (pf->flags & I40E_FLAG_FD_SB_ENABLED) {