[dpdk-dev] [PATCH] nfp: add tso support

[Alejandro Lucero]

This patch implements NFP PMD support for TSO but it also requires
a firmware advertising the capability.

Signed-off-by: Alejandro Lucero <alejandro.lucero at netronome.com>
---
 doc/guides/nics/features/nfp.ini |  1 +
 drivers/net/nfp/nfp_net.c        | 40 ++++++++++++++++++++++++++++++++--------
 2 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/doc/guides/nics/features/nfp.ini b/doc/guides/nics/features/nfp.ini
index 7ac0d34..c04a738 100644
--- a/doc/guides/nics/features/nfp.ini
+++ b/doc/guides/nics/features/nfp.ini
@@ -11,6 +11,7 @@ Queue start/stop     = Y
 MTU update           = Y
 Jumbo frame          = Y
 Promiscuous mode     = Y
+TSO                  = Y
 RSS hash             = Y
 RSS key update       = Y
 RSS reta update      = Y
diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index ace9583..cee8f63 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -1147,6 +1147,9 @@ static void nfp_net_read_mac(struct nfp_net_hw *hw)
 	dev_info->speed_capa = ETH_SPEED_NUM_1G | ETH_LINK_SPEED_10G |
 			       ETH_SPEED_NUM_25G | ETH_SPEED_NUM_40G |
 			       ETH_SPEED_NUM_50G | ETH_LINK_SPEED_100G;
+
+	if (hw->cap & NFP_NET_CFG_CTRL_LSO)
+		dev_info->tx_offload_capa |= DEV_TX_OFFLOAD_TCP_TSO;
 }
 
 static const uint32_t *
@@ -1641,6 +1644,27 @@ static void nfp_net_read_mac(struct nfp_net_hw *hw)
 	return 0;
 }
 
+/* nfp_net_tx_tso - Set TX descriptor for TSO */
+static inline void
+nfp_net_tx_tso(struct nfp_net_txq *txq, struct nfp_net_tx_desc *txd,
+	       struct rte_mbuf *mb)
+{
+	uint64_t ol_flags;
+	struct nfp_net_hw *hw = txq->hw;
+
+	if (!(hw->cap & NFP_NET_CFG_CTRL_LSO))
+		return;
+
+	ol_flags = mb->ol_flags;
+
+	if (!(ol_flags & PKT_TX_TCP_SEG))
+		return;
+
+	txd->l4_offset = mb->l2_len + mb->l3_len + mb->l4_len;
+	txd->lso = rte_cpu_to_le_16(mb->tso_segsz);
+	txd->flags |= PCIE_DESC_TX_LSO;
+}
+
 /* nfp_net_tx_cksum - Set TX CSUM offload flags in TX descriptor */
 static inline void
 nfp_net_tx_cksum(struct nfp_net_txq *txq, struct nfp_net_tx_desc *txd,
@@ -2009,7 +2033,7 @@ uint32_t nfp_net_txq_full(struct nfp_net_txq *txq)
 {
 	struct nfp_net_txq *txq;
 	struct nfp_net_hw *hw;
-	struct nfp_net_tx_desc *txds;
+	struct nfp_net_tx_desc *txds, txd;
 	struct rte_mbuf *pkt;
 	uint64_t dma_addr;
 	int pkt_size, dma_size;
@@ -2058,19 +2082,17 @@ uint32_t nfp_net_txq_full(struct nfp_net_txq *txq)
 
 		/*
 		 * Checksum and VLAN flags just in the first descriptor for a
-		 * multisegment packet
+		 * multisegment packet, but TSO info needs to be in all of them.
 		 */
-		nfp_net_tx_cksum(txq, txds, pkt);
+		nfp_net_tx_tso(txq, &txd, pkt);
+		nfp_net_tx_cksum(txq, &txd, pkt);
 
 		if ((pkt->ol_flags & PKT_TX_VLAN_PKT) &&
 		    (hw->cap & NFP_NET_CFG_CTRL_TXVLAN)) {
-			txds->flags |= PCIE_DESC_TX_VLAN;
-			txds->vlan = pkt->vlan_tci;
+			txd.flags |= PCIE_DESC_TX_VLAN;
+			txd.vlan = pkt->vlan_tci;
 		}
 
-		if (pkt->ol_flags & PKT_TX_TCP_SEG)
-			rte_panic("TSO is not supported\n");
-
 		/*
 		 * mbuf data_len is the data in one segment and pkt_len data
 		 * in the whole packet. When the packet is just one segment,
@@ -2088,6 +2110,8 @@ uint32_t nfp_net_txq_full(struct nfp_net_txq *txq)
 		*lmbuf = pkt;
 
 		while (pkt_size) {
+			/* Copying TSO, VLAN and cksum info */
+			*txds = txd;
 			dma_size = pkt->data_len;
 			dma_addr = rte_mbuf_data_dma_addr(pkt);
 			PMD_TX_LOG(DEBUG, "Working with mbuf at dma address:"
-- 
1.9.1