[dpdk-dev] [PATCH V3 1/2] net/tap: convert to new Tx offloads API

[Moti Haimovsky <motih@mellanox.com>]

Ethdev Tx offloads API has changed since:
commit cba7f53b717d ("ethdev: introduce Tx queue offloads API")
This commit support the new Tx offloads API.

Signed-off-by: Moti Haimovsky <motih@mellanox.com>
---
V3:
* Fixed coding style warnings

V2:
* Fixed coding style warnings
---
 drivers/net/tap/rte_eth_tap.c | 96 +++++++++++++++++++++++++++++++++++++------
 drivers/net/tap/rte_eth_tap.h |  1 +
 2 files changed, 85 insertions(+), 12 deletions(-)

diff --git a/drivers/net/tap/rte_eth_tap.c b/drivers/net/tap/rte_eth_tap.c
index 6b27679..1a84adb 100644
--- a/drivers/net/tap/rte_eth_tap.c
+++ b/drivers/net/tap/rte_eth_tap.c
@@ -53,6 +53,7 @@
 #include <sys/mman.h>
 #include <errno.h>
 #include <signal.h>
+#include <stdbool.h>
 #include <stdint.h>
 #include <sys/uio.h>
 #include <unistd.h>
@@ -379,6 +380,42 @@ enum ioctl_mode {
 	return num_rx;
 }
 
+static uint64_t
+tap_tx_offload_get_port_capa(void)
+{
+	/*
+	 * In order to support legacy apps,
+	 * report capabilities also as port capabilities.
+	 */
+	return DEV_TX_OFFLOAD_IPV4_CKSUM |
+	       DEV_TX_OFFLOAD_UDP_CKSUM |
+	       DEV_TX_OFFLOAD_TCP_CKSUM;
+}
+
+static uint64_t
+tap_tx_offload_get_queue_capa(void)
+{
+	return DEV_TX_OFFLOAD_IPV4_CKSUM |
+	       DEV_TX_OFFLOAD_UDP_CKSUM |
+	       DEV_TX_OFFLOAD_TCP_CKSUM;
+}
+
+static bool
+tap_txq_are_offloads_valid(struct rte_eth_dev *dev, uint64_t offloads)
+{
+	uint64_t port_offloads = dev->data->dev_conf.txmode.offloads;
+	uint64_t queue_supp_offloads = tap_tx_offload_get_queue_capa();
+	uint64_t port_supp_offloads = tap_tx_offload_get_port_capa();
+
+	if ((offloads & (queue_supp_offloads | port_supp_offloads)) !=
+	    offloads)
+		return false;
+	/* Verify we have no conflict with port offloads */
+	if ((port_offloads ^ offloads) & port_supp_offloads)
+		return false;
+	return true;
+}
+
 static void
 tap_tx_offload(char *packet, uint64_t ol_flags, unsigned int l2_len,
 	       unsigned int l3_len)
@@ -465,9 +502,10 @@ enum ioctl_mode {
 				rte_pktmbuf_mtod(seg, void *);
 			seg = seg->next;
 		}
-		if (mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
-		    (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
-		    (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM) {
+		if (txq->csum &&
+		    ((mbuf->ol_flags & (PKT_TX_IP_CKSUM | PKT_TX_IPV4) ||
+		     (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM ||
+		     (mbuf->ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM))) {
 			/* Support only packets with all data in the same seg */
 			if (mbuf->nb_segs > 1)
 				break;
@@ -605,6 +643,17 @@ enum ioctl_mode {
 static int
 tap_dev_configure(struct rte_eth_dev *dev)
 {
+	uint64_t supp_tx_offloads = tap_tx_offload_get_port_capa();
+	uint64_t tx_offloads = dev->data->dev_conf.txmode.offloads;
+
+	if ((tx_offloads & supp_tx_offloads) != tx_offloads) {
+		rte_errno = ENOTSUP;
+		RTE_LOG(ERR, PMD,
+			"Some Tx offloads are not supported "
+			"requested 0x%lx supported 0x%lx\n",
+			tx_offloads, supp_tx_offloads);
+		return -rte_errno;
+	}
 	if (dev->data->nb_rx_queues > RTE_PMD_TAP_MAX_QUEUES) {
 		RTE_LOG(ERR, PMD,
 			"%s: number of rx queues %d exceeds max num of queues %d\n",
@@ -681,10 +730,9 @@ enum ioctl_mode {
 	dev_info->rx_offload_capa = (DEV_RX_OFFLOAD_IPV4_CKSUM |
 				     DEV_RX_OFFLOAD_UDP_CKSUM |
 				     DEV_RX_OFFLOAD_TCP_CKSUM);
-	dev_info->tx_offload_capa =
-		(DEV_TX_OFFLOAD_IPV4_CKSUM |
-		 DEV_TX_OFFLOAD_UDP_CKSUM |
-		 DEV_TX_OFFLOAD_TCP_CKSUM);
+	dev_info->tx_queue_offload_capa = tap_tx_offload_get_queue_capa();
+	dev_info->tx_offload_capa = dev_info->tx_queue_offload_capa |
+				    tap_tx_offload_get_port_capa();
 }
 
 static int
@@ -1058,21 +1106,45 @@ enum ioctl_mode {
 		   uint16_t tx_queue_id,
 		   uint16_t nb_tx_desc __rte_unused,
 		   unsigned int socket_id __rte_unused,
-		   const struct rte_eth_txconf *tx_conf __rte_unused)
+		   const struct rte_eth_txconf *tx_conf)
 {
 	struct pmd_internals *internals = dev->data->dev_private;
+	struct tx_queue *txq;
 	int ret;
 
 	if (tx_queue_id >= dev->data->nb_tx_queues)
 		return -1;
-
 	dev->data->tx_queues[tx_queue_id] = &internals->txq[tx_queue_id];
+	txq = dev->data->tx_queues[tx_queue_id];
+	/*
+	 * Don't verify port offloads for application which
+	 * use the old API.
+	 */
+	if (tx_conf != NULL &&
+	    !!(tx_conf->txq_flags & ETH_TXQ_FLAGS_IGNORE)) {
+		if (tap_txq_are_offloads_valid(dev, tx_conf->offloads)) {
+			txq->csum = !!(tx_conf->offloads &
+					(DEV_TX_OFFLOAD_IPV4_CKSUM |
+					 DEV_TX_OFFLOAD_UDP_CKSUM |
+					 DEV_TX_OFFLOAD_TCP_CKSUM));
+		} else {
+			rte_errno = ENOTSUP;
+			RTE_LOG(ERR, PMD,
+				"%p: Tx queue offloads 0x%lx don't match port "
+				"offloads 0x%lx or supported offloads 0x%lx",
+				(void *)dev, tx_conf->offloads,
+				dev->data->dev_conf.txmode.offloads,
+				tap_tx_offload_get_port_capa());
+			return -rte_errno;
+		}
+	}
 	ret = tap_setup_queue(dev, internals, tx_queue_id, 0);
 	if (ret == -1)
 		return -1;
-
-	RTE_LOG(DEBUG, PMD, "  TX TAP device name %s, qid %d on fd %d\n",
-		internals->name, tx_queue_id, internals->txq[tx_queue_id].fd);
+	RTE_LOG(DEBUG, PMD,
+		"  TX TAP device name %s, qid %d on fd %d csum %s\n",
+		internals->name, tx_queue_id, internals->txq[tx_queue_id].fd,
+		txq->csum ? "on" : "off");
 
 	return 0;
 }
diff --git a/drivers/net/tap/rte_eth_tap.h b/drivers/net/tap/rte_eth_tap.h
index 829f32f..69a1a08 100644
--- a/drivers/net/tap/rte_eth_tap.h
+++ b/drivers/net/tap/rte_eth_tap.h
@@ -76,6 +76,7 @@ struct rx_queue {
 struct tx_queue {
 	int fd;
 	uint16_t *mtu;                  /* Pointer to MTU from dev_data */
+	uint16_t csum:1;                /* Enable checksum offloading */
 	struct pkt_stats stats;         /* Stats for this TX queue */
 };
 
-- 
1.8.3.1