[PATCH v8 08/14] net/pcap: support VLAN insert and strip

[Stephen Hemminger]

Driver can easily insert VLAN tag strip and insertion similar
to how it is handled in virtio and af_packet.

Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 doc/guides/nics/features/pcap.ini      |  1 +
 doc/guides/rel_notes/release_26_03.rst |  1 +
 drivers/net/pcap/pcap_ethdev.c         | 38 ++++++++++++++++++++++----
 3 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/doc/guides/nics/features/pcap.ini b/doc/guides/nics/features/pcap.ini
index b0dac3cca7..814bc2119f 100644
--- a/doc/guides/nics/features/pcap.ini
+++ b/doc/guides/nics/features/pcap.ini
@@ -10,6 +10,7 @@ Scattered Rx         = Y
 Timestamp offload    = Y
 Basic stats          = Y
 Stats per queue      = Y
+VLAN offload         = Y
 Multiprocess aware   = Y
 FreeBSD              = Y
 Linux                = Y
diff --git a/doc/guides/rel_notes/release_26_03.rst b/doc/guides/rel_notes/release_26_03.rst
index 76d81ac524..3d25626adb 100644
--- a/doc/guides/rel_notes/release_26_03.rst
+++ b/doc/guides/rel_notes/release_26_03.rst
@@ -59,6 +59,7 @@ New Features
 
   * Changed transmit burst to always return the number of packets requested.
     Failed sends are counted as transmit errors.
+  * Added support for VLAN insertion and stripping.
 
 
 Removed Items
diff --git a/drivers/net/pcap/pcap_ethdev.c b/drivers/net/pcap/pcap_ethdev.c
index 63a4f92c9c..47211807a7 100644
--- a/drivers/net/pcap/pcap_ethdev.c
+++ b/drivers/net/pcap/pcap_ethdev.c
@@ -75,6 +75,7 @@ struct queue_missed_stat {
 struct pcap_rx_queue {
 	uint16_t port_id;
 	uint16_t queue_id;
+	bool vlan_strip;
 	struct rte_mempool *mb_pool;
 	struct queue_stat rx_stat;
 	struct queue_missed_stat missed_stat;
@@ -102,6 +103,7 @@ struct pmd_internals {
 	bool single_iface;
 	bool phy_mac;
 	bool infinite_rx;
+	bool vlan_strip;
 };
 
 struct pmd_process_private {
@@ -332,6 +334,10 @@ eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		}
 
 		mbuf->pkt_len = len;
+
+		if (pcap_q->vlan_strip)
+			rte_vlan_strip(mbuf);
+
 		uint64_t us = (uint64_t)header->ts.tv_sec * US_PER_S + header->ts.tv_usec;
 
 		*RTE_MBUF_DYNFIELD(mbuf, timestamp_dynfield_offset, rte_mbuf_timestamp_t *) = us;
@@ -416,15 +422,21 @@ eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 	/* writes the nb_pkts packets to the previously opened pcap file dumper */
 	for (i = 0; i < nb_pkts; i++) {
 		struct rte_mbuf *mbuf = bufs[i];
-		uint32_t len = rte_pktmbuf_pkt_len(mbuf);
-		void *temp = NULL;
-		const uint8_t *data;
+
+		if (mbuf->ol_flags & RTE_MBUF_F_TX_VLAN) {
+			/* if vlan insert fails treat it as error */
+			if (unlikely(rte_vlan_insert(&mbuf) != 0))
+				continue;
+		}
 
 		calculate_timestamp(&header.ts);
+
+		uint32_t len = rte_pktmbuf_pkt_len(mbuf);
 		header.len = len;
 		header.caplen = len;
 
-		data = pcap_pktmbuf_read(mbuf, 0, len, &temp);
+		void *temp = NULL;
+		const uint8_t *data = pcap_pktmbuf_read(mbuf, 0, len, &temp);
 		if (likely(data != NULL)) {
 			pcap_dump((u_char *)dumper, &header, data);
 
@@ -497,6 +509,12 @@ eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		void *temp = NULL;
 		const uint8_t *data;
 
+		if (mbuf->ol_flags & RTE_MBUF_F_TX_VLAN) {
+			/* if vlan insert fails treat it as error */
+			if (unlikely(rte_vlan_insert(&mbuf) != 0))
+				continue;
+		}
+
 		data = pcap_pktmbuf_read(mbuf, 0, len, &temp);
 		if (likely(data != NULL &&
 		    pcap_sendpacket(pcap, data, len) == 0)) {
@@ -731,8 +749,13 @@ eth_dev_stop(struct rte_eth_dev *dev)
 }
 
 static int
-eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
+eth_dev_configure(struct rte_eth_dev *dev)
 {
+	struct pmd_internals *internals = dev->data->dev_private;
+	struct rte_eth_conf *dev_conf = &dev->data->dev_conf;
+	const struct rte_eth_rxmode *rxmode = &dev_conf->rxmode;
+
+	internals->vlan_strip = !!(rxmode->offloads & RTE_ETH_RX_OFFLOAD_VLAN_STRIP);
 	return 0;
 }
 
@@ -748,7 +771,9 @@ eth_dev_info(struct rte_eth_dev *dev,
 	dev_info->max_rx_queues = dev->data->nb_rx_queues;
 	dev_info->max_tx_queues = dev->data->nb_tx_queues;
 	dev_info->min_rx_bufsize = 0;
-	dev_info->tx_offload_capa = RTE_ETH_TX_OFFLOAD_MULTI_SEGS;
+	dev_info->tx_offload_capa = RTE_ETH_TX_OFFLOAD_MULTI_SEGS |
+		RTE_ETH_TX_OFFLOAD_VLAN_INSERT;
+	dev_info->rx_offload_capa = RTE_ETH_RX_OFFLOAD_VLAN_STRIP;
 
 	return 0;
 }
@@ -895,6 +920,7 @@ eth_rx_queue_setup(struct rte_eth_dev *dev,
 	pcap_q->mb_pool = mb_pool;
 	pcap_q->port_id = dev->data->port_id;
 	pcap_q->queue_id = rx_queue_id;
+	pcap_q->vlan_strip = internals->vlan_strip;
 	dev->data->rx_queues[rx_queue_id] = pcap_q;
 
 	if (internals->infinite_rx) {
-- 
2.51.0