[dpdk-dev] [PATCH] net/enic: add a Tx prepare handler

[John Daley <johndale@cisco.com>]

From: Hyong Youb Kim <hyonkim@cisco.com>

Like most NICs, this hardware (Cisco VIC) also requires partial
checksum in the packet for checksum offload and TSO. So, add
the tx_pkt_prepare handler like other PMDs do.

Technically, VIC has an offload mode that does not require partial
checksum for non-TSO packets. But, it has no such mode for TSO
packets, making tx_pkt_prepare unavoidable.

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic.h        |  2 ++
 drivers/net/enic/enic_ethdev.c |  1 +
 drivers/net/enic/enic_rxtx.c   | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+)

diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h
index c76a8f0af..c083985ee 100644
--- a/drivers/net/enic/enic.h
+++ b/drivers/net/enic/enic.h
@@ -268,6 +268,8 @@ uint16_t enic_dummy_recv_pkts(void *rx_queue,
 			      uint16_t nb_pkts);
 uint16_t enic_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 			       uint16_t nb_pkts);
+uint16_t enic_prep_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
+			uint16_t nb_pkts);
 int enic_set_mtu(struct enic *enic, uint16_t new_mtu);
 int enic_link_update(struct enic *enic);
 void enic_fdir_info(struct enic *enic);
diff --git a/drivers/net/enic/enic_ethdev.c b/drivers/net/enic/enic_ethdev.c
index 2c356dc27..c46d592ed 100644
--- a/drivers/net/enic/enic_ethdev.c
+++ b/drivers/net/enic/enic_ethdev.c
@@ -641,6 +641,7 @@ static int eth_enicpmd_dev_init(struct rte_eth_dev *eth_dev)
 	eth_dev->dev_ops = &enicpmd_eth_dev_ops;
 	eth_dev->rx_pkt_burst = &enic_recv_pkts;
 	eth_dev->tx_pkt_burst = &enic_xmit_pkts;
+	eth_dev->tx_pkt_prepare = &enic_prep_pkts;
 
 	pdev = RTE_ETH_DEV_TO_PCI(eth_dev);
 	rte_eth_copy_pci_info(eth_dev, pdev);
diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c
index 8157697a0..2fe5a3fa3 100644
--- a/drivers/net/enic/enic_rxtx.c
+++ b/drivers/net/enic/enic_rxtx.c
@@ -5,6 +5,7 @@
 
 #include <rte_mbuf.h>
 #include <rte_ethdev_driver.h>
+#include <rte_net.h>
 #include <rte_prefetch.h>
 
 #include "enic_compat.h"
@@ -14,6 +15,15 @@
 #include <rte_ip.h>
 #include <rte_tcp.h>
 
+#define	ENIC_TX_OFFLOAD_MASK (			 \
+		PKT_TX_VLAN_PKT |		 \
+		PKT_TX_IP_CKSUM |		 \
+		PKT_TX_L4_MASK |		 \
+		PKT_TX_TCP_SEG)
+
+#define	ENIC_TX_OFFLOAD_NOTSUP_MASK \
+	(PKT_TX_OFFLOAD_MASK ^ ENIC_TX_OFFLOAD_MASK)
+
 #define RTE_PMD_USE_PREFETCH
 
 #ifdef RTE_PMD_USE_PREFETCH
@@ -433,6 +443,38 @@ unsigned int enic_cleanup_wq(__rte_unused struct enic *enic, struct vnic_wq *wq)
 	return 0;
 }
 
+uint16_t enic_prep_pkts(__rte_unused void *tx_queue, struct rte_mbuf **tx_pkts,
+			uint16_t nb_pkts)
+{
+	int32_t ret;
+	uint16_t i;
+	uint64_t ol_flags;
+	struct rte_mbuf *m;
+
+	for (i = 0; i != nb_pkts; i++) {
+		m = tx_pkts[i];
+		ol_flags = m->ol_flags;
+		if (ol_flags & ENIC_TX_OFFLOAD_NOTSUP_MASK) {
+			rte_errno = -ENOTSUP;
+			return i;
+		}
+#ifdef RTE_LIBRTE_ETHDEV_DEBUG
+		ret = rte_validate_tx_offload(m);
+		if (ret != 0) {
+			rte_errno = ret;
+			return i;
+		}
+#endif
+		ret = rte_net_intel_cksum_prepare(m);
+		if (ret != 0) {
+			rte_errno = ret;
+			return i;
+		}
+	}
+
+	return i;
+}
+
 uint16_t enic_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 	uint16_t nb_pkts)
 {
-- 
2.12.0