[PATCH 2/4] net/txgbe: add USO support

[Zaiyu Wang]

USO (UDP Segmentation Offload), also known as UFO (UDP Fragmentation
Offload), is a hardware offload rarely seen in DPDK. Its implementation
is similar to TSO (TCP Segmentation Offload), so the driver enables
USO based on existing TSO support.

Note:
USO segments UDP packets, requiring hardware to recalculate both IP
and UDP checksums due to length change. Thus, USO implicitly requires
IP and UDP checksum offloads, same as TSO.

Signed-off-by: Zaiyu Wang <zaiyuwang at trustnetic.com>
---
 drivers/net/txgbe/txgbe_rxtx.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/txgbe/txgbe_rxtx.c b/drivers/net/txgbe/txgbe_rxtx.c
index f51c6193a9..77ec9f1e39 100644
--- a/drivers/net/txgbe/txgbe_rxtx.c
+++ b/drivers/net/txgbe/txgbe_rxtx.c
@@ -58,6 +58,7 @@ static const u64 TXGBE_TX_OFFLOAD_MASK = (RTE_MBUF_F_TX_IP_CKSUM |
 		RTE_MBUF_F_TX_VLAN |
 		RTE_MBUF_F_TX_L4_MASK |
 		RTE_MBUF_F_TX_TCP_SEG |
+		RTE_MBUF_F_TX_UDP_SEG |
 		RTE_MBUF_F_TX_TUNNEL_MASK |
 		RTE_MBUF_F_TX_OUTER_IP_CKSUM |
 		RTE_MBUF_F_TX_OUTER_UDP_CKSUM |
@@ -366,7 +367,7 @@ txgbe_set_xmit_ctx(struct txgbe_tx_queue *txq,
 	type_tucmd_mlhl |= TXGBE_TXD_PTID(tx_offload.ptid);
 
 	/* check if TCP segmentation required for this packet */
-	if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
+	if (ol_flags & (RTE_MBUF_F_TX_TCP_SEG | RTE_MBUF_F_TX_UDP_SEG)) {
 		tx_offload_mask.l2_len |= ~0;
 		tx_offload_mask.l3_len |= ~0;
 		tx_offload_mask.l4_len |= ~0;
@@ -516,7 +517,7 @@ tx_desc_cksum_flags_to_olinfo(uint64_t ol_flags)
 		tmp |= TXGBE_TXD_CC;
 		tmp |= TXGBE_TXD_EIPCS;
 	}
-	if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
+	if (ol_flags & (RTE_MBUF_F_TX_TCP_SEG | RTE_MBUF_F_TX_UDP_SEG)) {
 		tmp |= TXGBE_TXD_CC;
 		/* implies IPv4 cksum */
 		if (ol_flags & RTE_MBUF_F_TX_IPV4)
@@ -536,7 +537,7 @@ tx_desc_ol_flags_to_cmdtype(uint64_t ol_flags)
 
 	if (ol_flags & RTE_MBUF_F_TX_VLAN)
 		cmdtype |= TXGBE_TXD_VLE;
-	if (ol_flags & RTE_MBUF_F_TX_TCP_SEG)
+	if (ol_flags & (RTE_MBUF_F_TX_TCP_SEG | RTE_MBUF_F_TX_UDP_SEG))
 		cmdtype |= TXGBE_TXD_TSE;
 	if (ol_flags & RTE_MBUF_F_TX_MACSEC)
 		cmdtype |= TXGBE_TXD_LINKSEC;
@@ -586,6 +587,8 @@ tx_desc_ol_flags_to_ptype(uint64_t oflags)
 
 	if (oflags & RTE_MBUF_F_TX_TCP_SEG)
 		ptype |= (tun ? RTE_PTYPE_INNER_L4_TCP : RTE_PTYPE_L4_TCP);
+	else if (oflags & RTE_MBUF_F_TX_UDP_SEG)
+		ptype |= (tun ? RTE_PTYPE_INNER_L4_UDP : RTE_PTYPE_L4_UDP);
 
 	/* Tunnel */
 	switch (oflags & RTE_MBUF_F_TX_TUNNEL_MASK) {
@@ -1071,7 +1074,7 @@ txgbe_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 
 		olinfo_status = 0;
 		if (tx_ol_req) {
-			if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
+			if (ol_flags & (RTE_MBUF_F_TX_TCP_SEG | RTE_MBUF_F_TX_UDP_SEG)) {
 				/* when TSO is on, paylen in descriptor is the
 				 * not the packet len but the tcp payload len
 				 */
@@ -2395,7 +2398,7 @@ txgbe_get_tx_port_offloads(struct rte_eth_dev *dev)
 		RTE_ETH_TX_OFFLOAD_TCP_CKSUM   |
 		RTE_ETH_TX_OFFLOAD_SCTP_CKSUM  |
 		RTE_ETH_TX_OFFLOAD_TCP_TSO     |
-		RTE_ETH_TX_OFFLOAD_UDP_TSO	   |
+		RTE_ETH_TX_OFFLOAD_UDP_TSO     |
 		RTE_ETH_TX_OFFLOAD_UDP_TNL_TSO	|
 		RTE_ETH_TX_OFFLOAD_IP_TNL_TSO	|
 		RTE_ETH_TX_OFFLOAD_VXLAN_TNL_TSO	|
-- 
2.21.0.windows.1