ixgbevf: Fix coexistence of malicious driver detection with XDP

In the case of the VF driver it is supposed to provide a context descriptor
that allows us to provide information about the header offsets inside of
the frame. However in the case of XDP we don't really have any of that
information since the data is minimally processed. As a result we were
seeing malicious driver detection (MDD) events being triggered when the PF
had that functionality enabled.

To address this I have added a bit of new code that will "prime" the XDP
ring by providing one context descriptor that assumes the minimal setup of
an Ethernet frame which is an L2 header length of 14. With just that we can
provide enough information to make the hardware happy so that we don't
trigger MDD events.
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>

drivers/net/ethernet/intel/ixgbevf/ixgbevf.h

@@ -76,6 +76,7 @@ enum ixgbevf_ring_state_t {
 	__IXGBEVF_TX_DETECT_HANG,
 	__IXGBEVF_HANG_CHECK_ARMED,
 	__IXGBEVF_TX_XDP_RING,
+	__IXGBEVF_TX_XDP_RING_PRIMED,
 };
 
 #define ring_is_xdp(ring) \

drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

@@ -991,24 +991,45 @@ static int ixgbevf_xmit_xdp_ring(struct ixgbevf_ring *ring,
 		return IXGBEVF_XDP_CONSUMED;
 
 	/* record the location of the first descriptor for this packet */
-	tx_buffer = &ring->tx_buffer_info[ring->next_to_use];
-	tx_buffer->bytecount = len;
-	tx_buffer->gso_segs = 1;
-	tx_buffer->protocol = 0;
-
 	i = ring->next_to_use;
-	tx_desc = IXGBEVF_TX_DESC(ring, i);
+	tx_buffer = &ring->tx_buffer_info[i];
 
 	dma_unmap_len_set(tx_buffer, len, len);
 	dma_unmap_addr_set(tx_buffer, dma, dma);
 	tx_buffer->data = xdp->data;
-	tx_desc->read.buffer_addr = cpu_to_le64(dma);
+	tx_buffer->bytecount = len;
+	tx_buffer->gso_segs = 1;
+	tx_buffer->protocol = 0;
+
+	/* Populate minimal context descriptor that will provide for the
+	 * fact that we are expected to process Ethernet frames.
+	 */
+	if (!test_bit(__IXGBEVF_TX_XDP_RING_PRIMED, &ring->state)) {
+		struct ixgbe_adv_tx_context_desc *context_desc;
+
+		set_bit(__IXGBEVF_TX_XDP_RING_PRIMED, &ring->state);
+
+		context_desc = IXGBEVF_TX_CTXTDESC(ring, 0);
+		context_desc->vlan_macip_lens	=
+			cpu_to_le32(ETH_HLEN << IXGBE_ADVTXD_MACLEN_SHIFT);
+		context_desc->seqnum_seed	= 0;
+		context_desc->type_tucmd_mlhl	=
+			cpu_to_le32(IXGBE_TXD_CMD_DEXT |
+				    IXGBE_ADVTXD_DTYP_CTXT);
+		context_desc->mss_l4len_idx	= 0;
+
+		i = 1;
+	}
 
 	/* put descriptor type bits */
 	cmd_type = IXGBE_ADVTXD_DTYP_DATA |
 		   IXGBE_ADVTXD_DCMD_DEXT |
 		   IXGBE_ADVTXD_DCMD_IFCS;
 	cmd_type |= len | IXGBE_TXD_CMD;
+
+	tx_desc = IXGBEVF_TX_DESC(ring, i);
+	tx_desc->read.buffer_addr = cpu_to_le64(dma);
+
 	tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
 	tx_desc->read.olinfo_status =
 			cpu_to_le32((len << IXGBE_ADVTXD_PAYLEN_SHIFT) |
@@ -1688,6 +1709,7 @@ static void ixgbevf_configure_tx_ring(struct ixgbevf_adapter *adapter,
 	       sizeof(struct ixgbevf_tx_buffer) * ring->count);
 
 	clear_bit(__IXGBEVF_HANG_CHECK_ARMED, &ring->state);
+	clear_bit(__IXGBEVF_TX_XDP_RING_PRIMED, &ring->state);
 
 	IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(reg_idx), txdctl);