bai bakari
2018-12-06 03:45:22 UTC
Hi,
Now, I want to get the data payload of rte_mbuf, and i wrote the following code:
struct ipv4_hdr *ipv4_hdr;
struct tcp_hdr *tcp_hdr;
uint32_t payload_len, ip_len;
uint8_t *payload = NULL;
ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, sizeof(struct ether_hdr));
ip_len = ntohs(ipv4_hdr->total_length);
if (ipv4_hdr->next_proto_id == IPPROTO_TCP) {
tcp_hdr = (struct tcp_hdr *)((uint8_t *)ipv4_hdr + ((ipv4_hdr->version_ihl & 0xf) << 2));
payload = (uint8_t *)tcp_hdr + (tcp_hdr->data_off << 2);
payload_len = ip_len - (payload - (uint8_t *)ipv4_hdr);
}
when i send packets using dpdk-pktgen, i found:
ip_len = 46
ip_header_len = 20
but the tcp_header_len=(tcp_hdr->data_off << 2)=0,
and (payload - (uint8_t *)ipv4_hdr) = 340 > ip_len.
I'm confused, is there any errors about the code to compute the payload_len of rte_mbuf?
I think maybe the dpdk-pktgen cannot send the packets with payload?
I'm a beginner, anyone can help me how to compute the payload_len of rte_mbuf and test it?
Thank you
Now, I want to get the data payload of rte_mbuf, and i wrote the following code:
struct ipv4_hdr *ipv4_hdr;
struct tcp_hdr *tcp_hdr;
uint32_t payload_len, ip_len;
uint8_t *payload = NULL;
ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, sizeof(struct ether_hdr));
ip_len = ntohs(ipv4_hdr->total_length);
if (ipv4_hdr->next_proto_id == IPPROTO_TCP) {
tcp_hdr = (struct tcp_hdr *)((uint8_t *)ipv4_hdr + ((ipv4_hdr->version_ihl & 0xf) << 2));
payload = (uint8_t *)tcp_hdr + (tcp_hdr->data_off << 2);
payload_len = ip_len - (payload - (uint8_t *)ipv4_hdr);
}
when i send packets using dpdk-pktgen, i found:
ip_len = 46
ip_header_len = 20
but the tcp_header_len=(tcp_hdr->data_off << 2)=0,
and (payload - (uint8_t *)ipv4_hdr) = 340 > ip_len.
I'm confused, is there any errors about the code to compute the payload_len of rte_mbuf?
I think maybe the dpdk-pktgen cannot send the packets with payload?
I'm a beginner, anyone can help me how to compute the payload_len of rte_mbuf and test it?
Thank you