Merge branch 'i40e-ice-af_xdp-zc-fixes'

Björn Töpel says:

====================
i40e/ice AF_XDP ZC fixes

This series address two crashes in the AF_XDP zero-copy mode for ice
and i40e. More details in each individual the commit message.
====================

Link: https://lore.kernel.org/r/20201211145712.72957-1-bjorn.topel@gmail.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/intel/i40e/i40e_xsk.c

@@ -220,8 +220,11 @@ bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
 	} while (count);
 
 no_buffers:
-	if (rx_ring->next_to_use != ntu)
+	if (rx_ring->next_to_use != ntu) {
+		/* clear the status bits for the next_to_use descriptor */
+		rx_desc->wb.qword1.status_error_len = 0;
 		i40e_release_rx_desc(rx_ring, ntu);
+	}
 
 	return ok;
 }

drivers/net/ethernet/intel/ice/ice_xsk.c

@@ -446,8 +446,11 @@ bool ice_alloc_rx_bufs_zc(struct ice_ring *rx_ring, u16 count)
 		}
 	} while (--count);
 
-	if (rx_ring->next_to_use != ntu)
+	if (rx_ring->next_to_use != ntu) {
+		/* clear the status bits for the next_to_use descriptor */
+		rx_desc->wb.status_error0 = 0;
 		ice_release_rx_desc(rx_ring, ntu);
+	}
 
 	return ret;
 }