iavf: Add support for VIRTCHNL_VF_OFFLOAD_VLAN_V2 hotpath

The new VIRTCHNL_VF_OFFLOAD_VLAN_V2 capability added support that allows
the PF to set the location of the Tx and Rx VLAN tag for insertion and
stripping offloads. In order to support this functionality a few changes
are needed.

1. Add a new method to cache the VLAN tag location based on negotiated
   capabilities for the Tx and Rx ring flags. This needs to be called in
   the initialization and reset paths.

2. Refactor the transmit hotpath to account for the new Tx ring flags.
   When IAVF_TXR_FLAGS_VLAN_LOC_L2TAG2 is set, then the driver needs to
   insert the VLAN tag in the L2TAG2 field of the transmit descriptor.
   When the IAVF_TXRX_FLAGS_VLAN_LOC_L2TAG1 is set, then the driver needs
   to use the l2tag1 field of the data descriptor (same behavior as
   before).

3. Refactor the iavf_tx_prepare_vlan_flags() function to simplify
   transmit hardware VLAN offload functionality by only depending on the
   skb_vlan_tag_present() function. This can be done because the OS
   won't request transmit offload for a VLAN unless the driver told the
   OS it's supported and enabled.

4. Refactor the receive hotpath to account for the new Rx ring flags and
   VLAN ethertypes. This requires checking the Rx ring flags and
   descriptor status bits to determine the location of the VLAN tag.
   Also, since only a single ethertype can be supported at a time, check
   the enabled netdev features before specifying a VLAN ethertype in
   __vlan_hwaccel_put_tag().

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 17 insertions, 13 deletions

diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.h b/drivers/net/ethernet/intel/iavf/iavf_txrx.h
index e5b9ba42dd00..2624bf6d009e 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.h
@@ -243,19 +243,20 @@ static inline unsigned int iavf_txd_use_count(unsigned int size)
 #define DESC_NEEDED (MAX_SKB_FRAGS + 6)
 #define IAVF_MIN_DESC_PENDING	4
 
-#define IAVF_TX_FLAGS_HW_VLAN		BIT(1)
-#define IAVF_TX_FLAGS_SW_VLAN		BIT(2)
-#define IAVF_TX_FLAGS_TSO		BIT(3)
-#define IAVF_TX_FLAGS_IPV4		BIT(4)
-#define IAVF_TX_FLAGS_IPV6		BIT(5)
-#define IAVF_TX_FLAGS_FCCRC		BIT(6)
-#define IAVF_TX_FLAGS_FSO		BIT(7)
-#define IAVF_TX_FLAGS_FD_SB		BIT(9)
-#define IAVF_TX_FLAGS_VXLAN_TUNNEL	BIT(10)
-#define IAVF_TX_FLAGS_VLAN_MASK		0xffff0000
-#define IAVF_TX_FLAGS_VLAN_PRIO_MASK	0xe0000000
-#define IAVF_TX_FLAGS_VLAN_PRIO_SHIFT	29
-#define IAVF_TX_FLAGS_VLAN_SHIFT	16
+#define IAVF_TX_FLAGS_HW_VLAN			BIT(1)
+#define IAVF_TX_FLAGS_SW_VLAN			BIT(2)
+#define IAVF_TX_FLAGS_TSO			BIT(3)
+#define IAVF_TX_FLAGS_IPV4			BIT(4)
+#define IAVF_TX_FLAGS_IPV6			BIT(5)
+#define IAVF_TX_FLAGS_FCCRC			BIT(6)
+#define IAVF_TX_FLAGS_FSO			BIT(7)
+#define IAVF_TX_FLAGS_FD_SB			BIT(9)
+#define IAVF_TX_FLAGS_VXLAN_TUNNEL		BIT(10)
+#define IAVF_TX_FLAGS_HW_OUTER_SINGLE_VLAN	BIT(11)
+#define IAVF_TX_FLAGS_VLAN_MASK			0xffff0000
+#define IAVF_TX_FLAGS_VLAN_PRIO_MASK		0xe0000000
+#define IAVF_TX_FLAGS_VLAN_PRIO_SHIFT		29
+#define IAVF_TX_FLAGS_VLAN_SHIFT		16
 
 struct iavf_tx_buffer {
 	struct iavf_tx_desc *next_to_watch;
@@ -362,6 +363,9 @@ struct iavf_ring {
 	u16 flags;
 #define IAVF_TXR_FLAGS_WB_ON_ITR		BIT(0)
 #define IAVF_RXR_FLAGS_BUILD_SKB_ENABLED	BIT(1)
+#define IAVF_TXRX_FLAGS_VLAN_TAG_LOC_L2TAG1	BIT(3)
+#define IAVF_TXR_FLAGS_VLAN_TAG_LOC_L2TAG2	BIT(4)
+#define IAVF_RXR_FLAGS_VLAN_TAG_LOC_L2TAG2_2	BIT(5)
 
 	/* stats structs */
 	struct iavf_queue_stats	stats;