examples/tep_term: add inner checksum Tx offload configuration

Add Tx checksum offload configuration for inner header.

For UDP tunneling packet, the inner Tx checksum offload means
inner IPv4 and inner L4(TCP/UDP/SCTP).

Signed-off-by: Jijiang Liu <jijiang.liu@intel.com>

diff --git a/examples/tep_termination/main.c b/examples/tep_termination/main.c
index 69d73d6..99dfd73 100644 (file)
--- a/examples/tep_termination/main.c
+++ b/examples/tep_termination/main.c
@@ -113,6 +113,7 @@
 
 #define CMD_LINE_OPT_NB_DEVICES "nb-devices"
 #define CMD_LINE_OPT_UDP_PORT "udp-port"
+#define CMD_LINE_OPT_TX_CHECKSUM "tx-checksum"
 #define CMD_LINE_OPT_FILTER_TYPE "filter-type"
 #define CMD_LINE_OPT_RX_RETRY "rx-retry"
 #define CMD_LINE_OPT_RX_RETRY_DELAY "rx-retry-delay"
@@ -141,6 +142,9 @@ struct vpool {
 /* UDP tunneling port */
 uint16_t udp_port = 4789;
 
+/* enable/disable inner TX checksum */
+uint8_t tx_checksum = 0;
+
 /* RX filter type for tunneling packet */
 uint8_t filter_idx = 1;
 
@@ -260,6 +264,7 @@ tep_termination_usage(const char *prgname)
        RTE_LOG(INFO, VHOST_CONFIG, "%s [EAL options] -- -p PORTMASK\n"
        "               --udp-port: UDP destination port for VXLAN packet\n"
        "               --nb-devices[1-64]: The number of virtIO device\n"
+       "               --tx-checksum [0|1]: inner Tx checksum offload\n"
        "               --filter-type[1-3]: filter type for tunneling packet\n"
        "                   1: Inner MAC and tenent ID\n"
        "                   2: Inner MAC and VLAN, and tenent ID\n"
@@ -289,6 +294,7 @@ tep_termination_parse_args(int argc, char **argv)
        static struct option long_option[] = {
                {CMD_LINE_OPT_NB_DEVICES, required_argument, NULL, 0},
                {CMD_LINE_OPT_UDP_PORT, required_argument, NULL, 0},
+               {CMD_LINE_OPT_TX_CHECKSUM, required_argument, NULL, 0},
                {CMD_LINE_OPT_FILTER_TYPE, required_argument, NULL, 0},
                {CMD_LINE_OPT_RX_RETRY, required_argument, NULL, 0},
                {CMD_LINE_OPT_RX_RETRY_DELAY, required_argument, NULL, 0},
@@ -382,6 +388,19 @@ tep_termination_parse_args(int argc, char **argv)
                                        burst_rx_retry_num = ret;
                        }
 
+                       if (!strncmp(long_option[option_index].name,
+                               CMD_LINE_OPT_TX_CHECKSUM,
+                               sizeof(CMD_LINE_OPT_TX_CHECKSUM))) {
+                               ret = parse_num_opt(optarg, 1);
+                               if (ret == -1) {
+                                       RTE_LOG(INFO, VHOST_CONFIG,
+                                               "Invalid argument for tx-checksum [0|1]\n");
+                                       tep_termination_usage(prgname);
+                                       return -1;
+                               } else
+                                       tx_checksum = ret;
+                       }
+
                        if (!strncmp(long_option[option_index].name,
                                        CMD_LINE_OPT_FILTER_TYPE,
                                        sizeof(CMD_LINE_OPT_FILTER_TYPE))) {

diff --git a/examples/tep_termination/vxlan.c b/examples/tep_termination/vxlan.c
index 2f143ac..34851d8 100644 (file)
--- a/examples/tep_termination/vxlan.c
+++ b/examples/tep_termination/vxlan.c
@@ -41,6 +41,15 @@
 #include "main.h"
 #include "vxlan.h"
 
+static uint16_t
+get_psd_sum(void *l3_hdr, uint16_t ethertype, uint64_t ol_flags)
+{
+       if (ethertype == ETHER_TYPE_IPv4)
+               return rte_ipv4_phdr_cksum(l3_hdr, ol_flags);
+       else /* assume ethertype == ETHER_TYPE_IPv6 */
+               return rte_ipv6_phdr_cksum(l3_hdr, ol_flags);
+}
+
 /**
  * Parse an ethernet header to fill the ethertype, outer_l2_len, outer_l3_len and
  * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
@@ -83,6 +92,68 @@ parse_ethernet(struct ether_hdr *eth_hdr, union tunnel_offload_info *info,
        }
 }
 
+/**
+ * Calculate the checksum of a packet in hardware
+ */
+static uint64_t
+process_inner_cksums(struct ether_hdr *eth_hdr, union tunnel_offload_info *info)
+{
+       void *l3_hdr = NULL;
+       uint8_t l4_proto;
+       uint16_t ethertype;
+       struct ipv4_hdr *ipv4_hdr;
+       struct ipv6_hdr *ipv6_hdr;
+       struct udp_hdr *udp_hdr;
+       struct tcp_hdr *tcp_hdr;
+       struct sctp_hdr *sctp_hdr;
+       uint64_t ol_flags = 0;
+
+       info->l2_len = sizeof(struct ether_hdr);
+       ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
+
+       if (ethertype == ETHER_TYPE_VLAN) {
+               struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
+               info->l2_len  += sizeof(struct vlan_hdr);
+               ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
+       }
+
+       l3_hdr = (char *)eth_hdr + info->l2_len;
+
+       if (ethertype == ETHER_TYPE_IPv4) {
+               ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
+               ipv4_hdr->hdr_checksum = 0;
+               ol_flags |= PKT_TX_IPV4;
+               ol_flags |= PKT_TX_IP_CKSUM;
+               info->l3_len = sizeof(struct ipv4_hdr);
+               l4_proto = ipv4_hdr->next_proto_id;
+       } else if (ethertype == ETHER_TYPE_IPv6) {
+               ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
+               info->l3_len = sizeof(struct ipv6_hdr);
+               l4_proto = ipv6_hdr->proto;
+               ol_flags |= PKT_TX_IPV6;
+       } else
+               return 0; /* packet type not supported, nothing to do */
+
+       if (l4_proto == IPPROTO_UDP) {
+               udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len);
+               ol_flags |= PKT_TX_UDP_CKSUM;
+               udp_hdr->dgram_cksum = get_psd_sum(l3_hdr,
+                               ethertype, ol_flags);
+       } else if (l4_proto == IPPROTO_TCP) {
+               tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + info->l3_len);
+               ol_flags |= PKT_TX_TCP_CKSUM;
+               tcp_hdr->cksum = get_psd_sum(l3_hdr, ethertype,
+                               ol_flags);
+
+       } else if (l4_proto == IPPROTO_SCTP) {
+               sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + info->l3_len);
+               sctp_hdr->cksum = 0;
+               ol_flags |= PKT_TX_SCTP_CKSUM;
+       }
+
+       return ol_flags;
+}
+
 int
 decapsulation(struct rte_mbuf *pkt)
 {
@@ -93,6 +164,7 @@ decapsulation(struct rte_mbuf *pkt)
        struct ether_hdr *phdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *);
 
        parse_ethernet(phdr, &info, &l4_proto);
+
        if (l4_proto != IPPROTO_UDP)
                return -1;
 
@@ -120,6 +192,7 @@ encapsulation(struct rte_mbuf *m, uint8_t queue_id)
        uint vport_id;
        uint64_t ol_flags = 0;
        uint32_t old_len = m->pkt_len, hash;
+       union tunnel_offload_info tx_offload = { .data = 0 };
        struct ether_hdr *phdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
 
        /*Allocate space for new ethernet, IPv4, UDP and VXLAN headers*/
@@ -148,6 +221,14 @@ encapsulation(struct rte_mbuf *m, uint8_t queue_id)
        ol_flags |= PKT_TX_OUTER_IP_CKSUM;
        ip->hdr_checksum = 0;
 
+       /* inner IP checksum offload */
+       if (tx_checksum) {
+               ol_flags |= process_inner_cksums(phdr, &tx_offload);
+               m->l2_len = tx_offload.l2_len;
+               m->l3_len = tx_offload.l3_len;
+               m->l2_len += ETHER_VXLAN_HLEN;
+       }
+
        m->outer_l2_len = sizeof(struct ether_hdr);
        m->outer_l3_len = sizeof(struct ipv4_hdr);
 

diff --git a/examples/tep_termination/vxlan.h b/examples/tep_termination/vxlan.h
index 502bbaa..090eb48 100644 (file)
--- a/examples/tep_termination/vxlan.h
+++ b/examples/tep_termination/vxlan.h
@@ -47,6 +47,7 @@
 
 extern struct ipv4_hdr app_ip_hdr[VXLAN_N_PORTS];
 extern struct ether_hdr app_l2_hdr[VXLAN_N_PORTS];
+extern uint8_t tx_checksum;
 
 struct vxlan_port {
        uint32_t vport_id;           /**< VirtIO port id */