[dpdk-dev] [PATCH v2] examples/ip_fragmentation: fix check of packet type

[Wei Dai]

The packet_type in mbuf is not correctly filled by ixgbe 82599 NIC.
To use the ether_type in ethernet header to check packet type is
more reliaber.

Fixes: 3c0184cc0c60 ("examples: replace some offload flags with packet type")
Fixes: ab351fe1c95c ("mbuf: remove packet type from offload flags")

Cc: stable at dpdk.org

Reported-by: Fangfang Wei <fangfangx.wei at intel.com>
Signed-off-by: Wei Dai <wei.dai at intel.com>
---
 examples/ip_fragmentation/main.c | 74 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/examples/ip_fragmentation/main.c b/examples/ip_fragmentation/main.c
index 9e9ecae..151f059 100644
--- a/examples/ip_fragmentation/main.c
+++ b/examples/ip_fragmentation/main.c
@@ -653,6 +653,74 @@ check_all_ports_link_status(uint8_t port_num, uint32_t port_mask)
 	}
 }
 
+/* Check L3 packet type detection capablity of the NIC port */
+static int
+check_ptype(int portid)
+{
+	int i, ret;
+	int ptype_l3_ipv4 = 0, ptype_l3_ipv6 = 0;
+	uint32_t ptype_mask = RTE_PTYPE_L3_MASK;
+
+	ret = rte_eth_dev_get_supported_ptypes(portid, ptype_mask, NULL, 0);
+	if (ret <= 0)
+		return 0;
+
+	uint32_t ptypes[ret];
+
+	ret = rte_eth_dev_get_supported_ptypes(portid, ptype_mask, ptypes, ret);
+	for (i = 0; i < ret; ++i) {
+		if (ptypes[i] & RTE_PTYPE_L3_IPV4)
+			ptype_l3_ipv4 = 1;
+		if (ptypes[i] & RTE_PTYPE_L3_IPV6)
+			ptype_l3_ipv6 = 1;
+	}
+
+	if (ptype_l3_ipv4 == 0)
+		printf("port %d cannot parse RTE_PTYPE_L3_IPV4\n", portid);
+
+	if (ptype_l3_ipv6 == 0)
+		printf("port %d cannot parse RTE_PTYPE_L3_IPV6\n", portid);
+
+	if (ptype_l3_ipv4 && ptype_l3_ipv6)
+		return 1;
+
+	return 0;
+
+}
+
+/* Parse packet type of a packet by SW */
+static inline void
+parse_ptype(struct rte_mbuf *m)
+{
+	struct ether_hdr *eth_hdr;
+	uint32_t packet_type = RTE_PTYPE_UNKNOWN;
+	uint16_t ether_type;
+
+	eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
+	ether_type = eth_hdr->ether_type;
+	if (ether_type == rte_cpu_to_be_16(ETHER_TYPE_IPv4))
+		packet_type |= RTE_PTYPE_L3_IPV4_EXT_UNKNOWN;
+	else if (ether_type == rte_cpu_to_be_16(ETHER_TYPE_IPv6))
+		packet_type |= RTE_PTYPE_L3_IPV6_EXT_UNKNOWN;
+
+	m->packet_type = packet_type;
+}
+
+/* callback function to detect packet type for a queue of a port */
+static uint16_t
+cb_parse_ptype(uint8_t port __rte_unused, uint16_t queue __rte_unused,
+		   struct rte_mbuf *pkts[], uint16_t nb_pkts,
+		   uint16_t max_pkts __rte_unused,
+		   void *user_param __rte_unused)
+{
+	uint16_t i;
+
+	for (i = 0; i < nb_pkts; ++i)
+		parse_ptype(pkts[i]);
+
+	return nb_pkts;
+}
+
 static int
 init_routing_table(void)
 {
@@ -944,6 +1012,12 @@ main(int argc, char **argv)
 				ret, portid);
 
 		rte_eth_promiscuous_enable(portid);
+
+		if (check_ptype(portid) == 0) {
+			rte_eth_add_rx_callback(portid, 0, cb_parse_ptype, NULL);
+			printf("Add Rx callback funciton to detect L3 packet type by SW :"
+				" port = %d\n", portid);
+		}
 	}
 
 	if (init_routing_table() < 0)
-- 
2.7.4