i40e: Do not enable NAPI on q_vectors that have no rings

[ Upstream commit 13a8cd191a2b470cfd435b3b57dbd21aa65ff78c ]

When testing the epoll w/ busy poll code I found that I could get into a
state where the i40e driver had q_vectors w/ active NAPI that had no rings.
This was resulting in a divide by zero error.  To correct it I am updating
the driver code so that we only support NAPI on q_vectors that have 1 or
more rings allocated to them.

Signed-off-by: Alexander Duyck <alexander.h.duyck@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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 2caafeb..becffd1 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4217,8 +4217,12 @@ static void i40e_napi_enable_all(struct i40e_vsi *vsi)
        if (!vsi->netdev)
                return;
 
-       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++)
-               napi_enable(&vsi->q_vectors[q_idx]->napi);
+       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++) {
+               struct i40e_q_vector *q_vector = vsi->q_vectors[q_idx];
+
+               if (q_vector->rx.ring || q_vector->tx.ring)
+                       napi_enable(&q_vector->napi);
+       }
 }
 
 /**
@@ -4232,8 +4236,12 @@ static void i40e_napi_disable_all(struct i40e_vsi *vsi)
        if (!vsi->netdev)
                return;
 
-       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++)
-               napi_disable(&vsi->q_vectors[q_idx]->napi);
+       for (q_idx = 0; q_idx < vsi->num_q_vectors; q_idx++) {
+               struct i40e_q_vector *q_vector = vsi->q_vectors[q_idx];
+
+               if (q_vector->rx.ring || q_vector->tx.ring)
+                       napi_disable(&q_vector->napi);
+       }
 }
 
 /**