[PATCH] net/gve: Add support for TSO in DQO RDA

[Tathagat Priyadarshi]

The patch intends on adding support for TSO in DQO RDA format.

Signed-off-by: Tathagat Priyadarshi <tathagat.dpdk at gmail.com>
Signed-off-by: Varun Lakkur Ambaji Rao <varun.la at gmail.com>
---
 drivers/net/gve/gve_tx_dqo.c | 42 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/drivers/net/gve/gve_tx_dqo.c b/drivers/net/gve/gve_tx_dqo.c
index 579b8d6..e5cdb57 100644
--- a/drivers/net/gve/gve_tx_dqo.c
+++ b/drivers/net/gve/gve_tx_dqo.c
@@ -72,6 +72,17 @@
 	txq->complq_tail = next;
 }
 
+static inline void
+gve_tx_fill_seg_desc_dqo(volatile union gve_tx_desc_dqo *desc, struct rte_mbuf *tx_pkt)
+{
+       uint32_t hlen = tx_pkt->l2_len + tx_pkt->l3_len + tx_pkt->l4_len;
+       desc->tso_ctx.cmd_dtype.dtype = GVE_TX_TSO_CTX_DESC_DTYPE_DQO;
+       desc->tso_ctx.cmd_dtype.tso = 1;
+       desc->tso_ctx.mss = (uint16_t)tx_pkt->tso_segsz;
+       desc->tso_ctx.tso_total_len = tx_pkt->pkt_len - hlen;
+       desc->tso_ctx.header_len = (uint8_t)hlen;
+}
+
 uint16_t
 gve_tx_burst_dqo(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 {
@@ -89,6 +100,8 @@
 	uint16_t sw_id;
 	uint64_t bytes;
 	uint16_t first_sw_id;
+	uint8_t tso;
+	uint8_t csum;
 
 	sw_ring = txq->sw_ring;
 	txr = txq->tx_ring;
@@ -108,12 +121,31 @@
 				gve_tx_clean_dqo(txq);
 		}
 
-		if (txq->nb_free < tx_pkt->nb_segs)
-			break;
-
 		ol_flags = tx_pkt->ol_flags;
 		nb_used = tx_pkt->nb_segs;
 		first_sw_id = sw_id;
+
+		if (ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
+			tso = 1;
+			csum = 1;
+		} else if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO) {
+			tso = 0;
+			csum = 1;
+		} else {
+			tso = 0;
+			csum = 0;
+		}
+
+		nb_used += tso;
+		if (txq->nb_free < nb_used)
+			break;
+
+		if (tso) {
+			txd = &txr[tx_id];
+			gve_tx_fill_seg_desc_dqo(txd, tx_pkt);
+			tx_id = (tx_id + 1) & mask;
+		}
+		
 		do {
 			if (sw_ring[sw_id] != NULL)
 				PMD_DRV_LOG(DEBUG, "Overwriting an entry in sw_ring");
@@ -127,6 +159,7 @@
 			txd->pkt.compl_tag = rte_cpu_to_le_16(first_sw_id);
 			txd->pkt.buf_size = RTE_MIN(tx_pkt->data_len, GVE_TX_MAX_BUF_SIZE_DQO);
 			txd->pkt.end_of_packet = 0;
+			txd->pkt.checksum_offload_enable = csum;
 
 			/* size of desc_ring and sw_ring could be different */
 			tx_id = (tx_id + 1) & mask;
@@ -139,9 +172,6 @@
 		/* fill the last descriptor with End of Packet (EOP) bit */
 		txd->pkt.end_of_packet = 1;
 
-		if (ol_flags & GVE_TX_CKSUM_OFFLOAD_MASK_DQO)
-			txd->pkt.checksum_offload_enable = 1;
-
 		txq->nb_free -= nb_used;
 		txq->nb_used += nb_used;
 	}
-- 
1.8.3.1