UDP GSO aka UDP Fragmentation Offload allows an application or stack
to provide a data payload larger than the MTU. The application then
updates the mbuf ol_flags and sets the PKT_TX_UDP_SEG flag. Then based
on the tso_segs and tso_mss fields in the mbuf the PMD can indicate
the UDP GSO transmit request to the hardware.
This feature is supported on Thor2 and will be enabled when the firmware
sets the UDP GSO support via the HWRM_FUNC_QCAPS.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
---
 drivers/net/bnxt/bnxt.h      | 1 +
 drivers/net/bnxt/bnxt_hwrm.c | 2 ++
 drivers/net/bnxt/bnxt_txq.c  | 2 ++
 drivers/net/bnxt/bnxt_txr.c  | 7 ++++++-
 4 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index 7aed4c3da3..4b5c2c4b8f 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -801,6 +801,7 @@ struct bnxt {
 	(BNXT_CHIP_P5_P7((bp)) && \
 	 (bp)->hwrm_spec_code >= HWRM_VERSION_1_9_2 && \
 	 !BNXT_VF((bp)))
+#define BNXT_FW_CAP_UDP_GSO		BIT(13)
 #define BNXT_TRUFLOW_EN(bp)	((bp)->fw_cap & BNXT_FW_CAP_TRUFLOW_EN &&\
 				 (bp)->app_id != 0xFF)
 
diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c
index e56f7693af..37cf179938 100644
--- a/drivers/net/bnxt/bnxt_hwrm.c
+++ b/drivers/net/bnxt/bnxt_hwrm.c
@@ -950,6 +950,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 	flags_ext2 = rte_le_to_cpu_32(resp->flags_ext2);
 	if (flags_ext2 & HWRM_FUNC_QCAPS_OUTPUT_FLAGS_EXT2_RX_ALL_PKTS_TIMESTAMPS_SUPPORTED)
 		bp->fw_cap |= BNXT_FW_CAP_RX_ALL_PKT_TS;
+	if (flags_ext2 & HWRM_FUNC_QCAPS_OUTPUT_FLAGS_EXT2_UDP_GSO_SUPPORTED)
+		bp->fw_cap |= BNXT_FW_CAP_UDP_GSO;
 
 unlock:
 	HWRM_UNLOCK();
diff --git a/drivers/net/bnxt/bnxt_txq.c b/drivers/net/bnxt/bnxt_txq.c
index 4df4604975..f99ad211db 100644
--- a/drivers/net/bnxt/bnxt_txq.c
+++ b/drivers/net/bnxt/bnxt_txq.c
@@ -42,6 +42,8 @@ uint64_t bnxt_get_tx_port_offloads(struct bnxt *bp)
 		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_GENEVE_TNL_TSO;
 	if (BNXT_TUNNELED_OFFLOADS_CAP_IPINIP_EN(bp))
 		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_IPIP_TNL_TSO;
+	if (bp->fw_cap & BNXT_FW_CAP_UDP_GSO)
+		tx_offload_capa |= RTE_ETH_TX_OFFLOAD_UDP_TSO;
 
 	return tx_offload_capa;
 }
diff --git a/drivers/net/bnxt/bnxt_txr.c b/drivers/net/bnxt/bnxt_txr.c
index 899986764f..38da2d2829 100644
--- a/drivers/net/bnxt/bnxt_txr.c
+++ b/drivers/net/bnxt/bnxt_txr.c
@@ -123,6 +123,10 @@ bnxt_xmit_need_long_bd(struct rte_mbuf *tx_pkt, struct bnxt_tx_queue *txq)
 	return false;
 }
 
+/* Used for verifying TSO segments during TCP Segmentation Offload or
+ * UDP Fragmentation Offload. tx_pkt->tso_segsz stores the number of
+ * segments or fragments in those cases.
+ */
 static bool
 bnxt_zero_data_len_tso_segsz(struct rte_mbuf *tx_pkt, uint8_t data_len_chk)
 {
@@ -308,7 +312,8 @@ static uint16_t bnxt_start_xmit(struct rte_mbuf *tx_pkt,
 		else
 			txbd1->cfa_action = txq->bp->tx_cfa_action;
 
-		if (tx_pkt->ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
+		if (tx_pkt->ol_flags & RTE_MBUF_F_TX_TCP_SEG ||
+		    tx_pkt->ol_flags & RTE_MBUF_F_TX_UDP_SEG) {
 			uint16_t hdr_size;
 
 			/* TSO */
-- 
2.39.2 (Apple Git-143)