AF_XDP socket 测试

本篇是之前博客[1]的进阶篇，博客中给出了相关环境安装配置。
功能：本篇通过bpf程序，将icmp数据包重定向到AF_XDP socket。
内核侧程序片断，xdpsock_kern.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <linux/in.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <linux/types.h>
#include <stddef.h>
#include <memory.h>
#include <sys/types.h>#define RR_LB 0
#define MAX_SOCKS 4#define SEC(NAME) __attribute__((section(NAME), used))#define __uint(name, val) int(*(name))[val]
#define __type(name, val) typeof(val) *(name)
#define __array(name, val) typeof(val) *(name)[]
//https://raw.githubusercontent.com/torvalds/linux/v4.19/tools/testing/selftests/bpf/bpf_helpers.h
static void *(*bpf_map_lookup_elem)(void *map, void *key) =(void *) BPF_FUNC_map_lookup_elem;
static int (*bpf_redirect_map)(void *map, int key, int flags) =(void *) BPF_FUNC_redirect_map;
struct {__uint(type, BPF_MAP_TYPE_ARRAY);__uint(key_size, sizeof(int));__uint(value_size, sizeof(int));__uint(max_entries, 1);
}qidconf_map SEC(".maps");struct{__uint(type, BPF_MAP_TYPE_XSKMAP);__uint(key_size, sizeof(int));__uint(value_size, sizeof(int));__uint(max_entries, MAX_SOCKS);
}xsks_map SEC(".maps");struct{__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);__uint(key_size, sizeof(int));__uint(value_size, sizeof(int));__uint(max_entries, 1);
}rr_map SEC(".maps");SEC("xdp_sock")
int xdp_sock_prog(struct xdp_md *ctx)
{int ipsize = 0;void *data = (void *)(long)ctx->data;void *data_end = (void *)(long)ctx->data_end;int *qidconf, key = 0, idx=0;unsigned int *rr;struct ethhdr *eth = data;ipsize = sizeof(*eth);struct iphdr *ip = data + ipsize;ipsize += sizeof(struct iphdr);if (data + ipsize > data_end) {// not an ip packet, too short. Pass it onreturn XDP_PASS;}// technically, we should also check if it is an IP packet by// checking the ethernet header proto field ...if (ip->protocol == IPPROTO_ICMP) {/*qidconf = bpf_map_lookup_elem(&qidconf_map, &key);if (!qidconf)return XDP_ABORTED;if (*qidconf != ctx->rx_queue_index)return XDP_PASS;*/#if RR_LB /* NB! RR_LB is configured in xdpsock.h */rr = bpf_map_lookup_elem(&rr_map, &key);if (!rr)return XDP_ABORTED;*rr = (*rr + 1) & (MAX_SOCKS - 1);idx = *rr;#endifreturn bpf_redirect_map(&xsks_map, idx, 0);    }return XDP_PASS;}
char _license[] SEC("license") = "GPL";
//clang -g -c -O2 -target bpf -c xdpsock_kern.c -o xdpsock_kern.o

编译命令：

clang -g -c -O2 -target bpf -c xdpsock_kern.c -o xdpsock_kern.o

用户侧程序段，xdpsock_user.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2017 - 2018 Intel Corporation. */
//https://android.googlesource.com/kernel/common/+/30bac164aca7/samples/bpf/xdpsock_user.c
#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <libgen.h>
#include <linux/bpf.h>
#include <linux/if_link.h>
#include <linux/if_xdp.h>
#include <linux/if_ether.h>
#include <net/if.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <net/ethernet.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <pthread.h>
#include <locale.h>
#include <sys/types.h>
#include <poll.h>
#include "bpf/libbpf.h"
//#include "bpf_util.h"
#include <bpf/bpf.h>
/* Power-of-2 number of sockets */
#define MAX_SOCKS 4
/* Round-robin receive */
#define RR_LB 0
#ifndef SOL_XDP
#define SOL_XDP 283
#endif
#ifndef AF_XDP
#define AF_XDP 44
#endif
#ifndef PF_XDP
#define PF_XDP AF_XDP
#endif
#define NUM_FRAMES 131072
#define FRAME_HEADROOM 0
#define FRAME_SHIFT 11
#define FRAME_SIZE 2048
#define NUM_DESCS 1024
#define BATCH_SIZE 16
#define FQ_NUM_DESCS 1024
#define CQ_NUM_DESCS 1024
#define DEBUG_HEXDUMP 0
typedef __u64 u64;
typedef __u32 u32;
static unsigned long prev_time;
enum benchmark_type {BENCH_RXDROP = 0,BENCH_TXONLY = 1,BENCH_L2FWD = 2,
};
static enum benchmark_type opt_bench = BENCH_RXDROP;
static u32 opt_xdp_flags;
static const char *opt_if = "";
static int opt_ifindex;
static int opt_queue;
static int opt_poll;
static int opt_shared_packet_buffer;
static int opt_interval = 1;
static u32 opt_xdp_bind_flags;
struct xdp_umem_uqueue {u32 cached_prod;u32 cached_cons;u32 mask;u32 size;u32 *producer;u32 *consumer;u64 *ring;void *map;
};
struct xdp_umem {char *frames;struct xdp_umem_uqueue fq;struct xdp_umem_uqueue cq;int fd;
};
struct xdp_uqueue {u32 cached_prod;u32 cached_cons;u32 mask;u32 size;u32 *producer;u32 *consumer;struct xdp_desc *ring;void *map;
};
struct xdpsock {struct xdp_uqueue rx;struct xdp_uqueue tx;int sfd;struct xdp_umem *umem;u32 outstanding_tx;unsigned long rx_npkts;unsigned long tx_npkts;unsigned long prev_rx_npkts;unsigned long prev_tx_npkts;
};
static int num_socks;
struct xdpsock *xsks[MAX_SOCKS];
static unsigned long get_nsecs(void)
{struct timespec ts;clock_gettime(CLOCK_MONOTONIC, &ts);return ts.tv_sec * 1000000000UL + ts.tv_nsec;
}
static void dump_stats(void);
#define lassert(expr)                           \do {                               \if (!(expr)) {                     \fprintf(stderr, "%s:%s:%i: Assertion failed: "   \#expr ": errno: %d/\"%s\"\n",      \__FILE__, __func__, __LINE__,      \errno, strerror(errno));       \dump_stats();                  \exit(EXIT_FAILURE);                \}                          \} while (0)
#define barrier() __asm__ __volatile__("": : :"memory")
#ifdef __aarch64__
#define u_smp_rmb() __asm__ __volatile__("dmb ishld": : :"memory")
#define u_smp_wmb() __asm__ __volatile__("dmb ishst": : :"memory")
#else
#define u_smp_rmb() barrier()
#define u_smp_wmb() barrier()
#endif
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
static const char pkt_data[] ="\x3c\xfd\xfe\x9e\x7f\x71\xec\xb1\xd7\x98\x3a\xc0\x08\x00\x45\x00""\x00\x2e\x00\x00\x00\x00\x40\x11\x88\x97\x05\x08\x07\x08\xc8\x14""\x1e\x04\x10\x92\x10\x92\x00\x1a\x6d\xa3\x34\x33\x1f\x69\x40\x6b""\x54\x59\xb6\x14\x2d\x11\x44\xbf\xaf\xd9\xbe\xaa";
static inline u32 umem_nb_free(struct xdp_umem_uqueue *q, u32 nb)
{u32 free_entries = q->cached_cons - q->cached_prod;if (free_entries >= nb)return free_entries;/* Refresh the local tail pointer */q->cached_cons = *q->consumer + q->size;return q->cached_cons - q->cached_prod;
}
static inline u32 xq_nb_free(struct xdp_uqueue *q, u32 ndescs)
{u32 free_entries = q->cached_cons - q->cached_prod;if (free_entries >= ndescs)return free_entries;/* Refresh the local tail pointer */q->cached_cons = *q->consumer + q->size;return q->cached_cons - q->cached_prod;
}
static inline u32 umem_nb_avail(struct xdp_umem_uqueue *q, u32 nb)
{u32 entries = q->cached_prod - q->cached_cons;if (entries == 0) {q->cached_prod = *q->producer;entries = q->cached_prod - q->cached_cons;}return (entries > nb) ? nb : entries;
}
static inline u32 xq_nb_avail(struct xdp_uqueue *q, u32 ndescs)
{u32 entries = q->cached_prod - q->cached_cons;if (entries == 0) {q->cached_prod = *q->producer;entries = q->cached_prod - q->cached_cons;}return (entries > ndescs) ? ndescs : entries;
}
static inline int umem_fill_to_kernel_ex(struct xdp_umem_uqueue *fq,struct xdp_desc *d,size_t nb)
{u32 i;if (umem_nb_free(fq, nb) < nb)return -ENOSPC;for (i = 0; i < nb; i++) {u32 idx = fq->cached_prod++ & fq->mask;fq->ring[idx] = d[i].addr;}u_smp_wmb();*fq->producer = fq->cached_prod;return 0;
}
static inline int umem_fill_to_kernel(struct xdp_umem_uqueue *fq, u64 *d,size_t nb)
{u32 i;if (umem_nb_free(fq, nb) < nb)return -ENOSPC;for (i = 0; i < nb; i++) {u32 idx = fq->cached_prod++ & fq->mask;fq->ring[idx] = d[i];}u_smp_wmb();*fq->producer = fq->cached_prod;return 0;
}
static inline size_t umem_complete_from_kernel(struct xdp_umem_uqueue *cq,u64 *d, size_t nb)
{u32 idx, i, entries = umem_nb_avail(cq, nb);u_smp_rmb();for (i = 0; i < entries; i++) {idx = cq->cached_cons++ & cq->mask;d[i] = cq->ring[idx];}if (entries > 0) {u_smp_wmb();*cq->consumer = cq->cached_cons;}return entries;
}
static inline void *xq_get_data(struct xdpsock *xsk, u64 addr)
{return &xsk->umem->frames[addr];
}
static inline int xq_enq(struct xdp_uqueue *uq,const struct xdp_desc *descs,unsigned int ndescs)
{struct xdp_desc *r = uq->ring;unsigned int i;if (xq_nb_free(uq, ndescs) < ndescs)return -ENOSPC;for (i = 0; i < ndescs; i++) {u32 idx = uq->cached_prod++ & uq->mask;r[idx].addr = descs[i].addr;r[idx].len = descs[i].len;}u_smp_wmb();*uq->producer = uq->cached_prod;return 0;
}
static inline int xq_enq_tx_only(struct xdp_uqueue *uq,unsigned int id, unsigned int ndescs)
{struct xdp_desc *r = uq->ring;unsigned int i;if (xq_nb_free(uq, ndescs) < ndescs)return -ENOSPC;for (i = 0; i < ndescs; i++) {u32 idx = uq->cached_prod++ & uq->mask;r[idx].addr = (id + i) << FRAME_SHIFT;r[idx].len    = sizeof(pkt_data) - 1;}u_smp_wmb();*uq->producer = uq->cached_prod;return 0;
}
static inline int xq_deq(struct xdp_uqueue *uq,struct xdp_desc *descs,int ndescs)
{struct xdp_desc *r = uq->ring;unsigned int idx;int i, entries;entries = xq_nb_avail(uq, ndescs);u_smp_rmb();for (i = 0; i < entries; i++) {idx = uq->cached_cons++ & uq->mask;descs[i] = r[idx];}if (entries > 0) {u_smp_wmb();*uq->consumer = uq->cached_cons;}return entries;
}
static void swap_mac_addresses(void *data)
{struct ether_header *eth = (struct ether_header *)data;struct ether_addr *src_addr = (struct ether_addr *)&eth->ether_shost;struct ether_addr *dst_addr = (struct ether_addr *)&eth->ether_dhost;struct ether_addr tmp;tmp = *src_addr;*src_addr = *dst_addr;*dst_addr = tmp;
}
static void hex_dump(void *pkt, size_t length, u64 addr)
{const unsigned char *address = (unsigned char *)pkt;const unsigned char *line = address;size_t line_size = 32;unsigned char c;char buf[32];int i = 0;if (!DEBUG_HEXDUMP)return;sprintf(buf, "addr=%llu", addr);printf("length = %zu\n", length);printf("%s | ", buf);while (length-- > 0) {printf("%02X ", *address++);if (!(++i % line_size) || (length == 0 && i % line_size)) {if (length == 0) {while (i++ % line_size)printf("__ ");}printf(" | ");    /* right close */while (line < address) {c = *line++;printf("%c", (c < 33 || c == 255) ? 0x2E : c);}printf("\n");if (length > 0)printf("%s | ", buf);}}printf("\n");
}
static size_t gen_eth_frame(char *frame)
{memcpy(frame, pkt_data, sizeof(pkt_data) - 1);return sizeof(pkt_data) - 1;
}
static struct xdp_umem *xdp_umem_configure(int sfd)
{int fq_size = FQ_NUM_DESCS, cq_size = CQ_NUM_DESCS;struct xdp_mmap_offsets off;struct xdp_umem_reg mr;struct xdp_umem *umem;socklen_t optlen;void *bufs;umem = calloc(1, sizeof(*umem));lassert(umem);lassert(posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */NUM_FRAMES * FRAME_SIZE) == 0);mr.addr = (__u64)bufs;mr.len = NUM_FRAMES * FRAME_SIZE;mr.chunk_size = FRAME_SIZE;mr.headroom = FRAME_HEADROOM;lassert(setsockopt(sfd, SOL_XDP, XDP_UMEM_REG, &mr, sizeof(mr)) == 0);lassert(setsockopt(sfd, SOL_XDP, XDP_UMEM_FILL_RING, &fq_size,sizeof(int)) == 0);lassert(setsockopt(sfd, SOL_XDP, XDP_UMEM_COMPLETION_RING, &cq_size,sizeof(int)) == 0);optlen = sizeof(off);lassert(getsockopt(sfd, SOL_XDP, XDP_MMAP_OFFSETS, &off,&optlen) == 0);umem->fq.map = mmap(0, off.fr.desc +FQ_NUM_DESCS * sizeof(u64),PROT_READ | PROT_WRITE,MAP_SHARED | MAP_POPULATE, sfd,XDP_UMEM_PGOFF_FILL_RING);lassert(umem->fq.map != MAP_FAILED);umem->fq.mask = FQ_NUM_DESCS - 1;umem->fq.size = FQ_NUM_DESCS;umem->fq.producer = umem->fq.map + off.fr.producer;umem->fq.consumer = umem->fq.map + off.fr.consumer;umem->fq.ring = umem->fq.map + off.fr.desc;umem->fq.cached_cons = FQ_NUM_DESCS;umem->cq.map = mmap(0, off.cr.desc +CQ_NUM_DESCS * sizeof(u64),PROT_READ | PROT_WRITE,MAP_SHARED | MAP_POPULATE, sfd,XDP_UMEM_PGOFF_COMPLETION_RING);lassert(umem->cq.map != MAP_FAILED);umem->cq.mask = CQ_NUM_DESCS - 1;umem->cq.size = CQ_NUM_DESCS;umem->cq.producer = umem->cq.map + off.cr.producer;umem->cq.consumer = umem->cq.map + off.cr.consumer;umem->cq.ring = umem->cq.map + off.cr.desc;umem->frames = bufs;umem->fd = sfd;if (opt_bench == BENCH_TXONLY) {int i;for (i = 0; i < NUM_FRAMES * FRAME_SIZE; i += FRAME_SIZE)(void)gen_eth_frame(&umem->frames[i]);}return umem;
}
static struct xdpsock *xsk_configure(struct xdp_umem *umem)
{struct sockaddr_xdp sxdp = {};struct xdp_mmap_offsets off;int sfd, ndescs = NUM_DESCS;struct xdpsock *xsk;bool shared = true;socklen_t optlen;u64 i;sfd = socket(PF_XDP, SOCK_RAW, 0);lassert(sfd >= 0);xsk = calloc(1, sizeof(*xsk));lassert(xsk);xsk->sfd = sfd;xsk->outstanding_tx = 0;if (!umem) {shared = false;xsk->umem = xdp_umem_configure(sfd);} else {xsk->umem = umem;}lassert(setsockopt(sfd, SOL_XDP, XDP_RX_RING,&ndescs, sizeof(int)) == 0);lassert(setsockopt(sfd, SOL_XDP, XDP_TX_RING,&ndescs, sizeof(int)) == 0);optlen = sizeof(off);lassert(getsockopt(sfd, SOL_XDP, XDP_MMAP_OFFSETS, &off,&optlen) == 0);/* Rx */xsk->rx.map = mmap(NULL,off.rx.desc +NUM_DESCS * sizeof(struct xdp_desc),PROT_READ | PROT_WRITE,MAP_SHARED | MAP_POPULATE, sfd,XDP_PGOFF_RX_RING);lassert(xsk->rx.map != MAP_FAILED);if (!shared) {for (i = 0; i < NUM_DESCS * FRAME_SIZE; i += FRAME_SIZE)lassert(umem_fill_to_kernel(&xsk->umem->fq, &i, 1)== 0);}/* Tx */xsk->tx.map = mmap(NULL,off.tx.desc +NUM_DESCS * sizeof(struct xdp_desc),PROT_READ | PROT_WRITE,MAP_SHARED | MAP_POPULATE, sfd,XDP_PGOFF_TX_RING);lassert(xsk->tx.map != MAP_FAILED);xsk->rx.mask = NUM_DESCS - 1;xsk->rx.size = NUM_DESCS;xsk->rx.producer = xsk->rx.map + off.rx.producer;xsk->rx.consumer = xsk->rx.map + off.rx.consumer;xsk->rx.ring = xsk->rx.map + off.rx.desc;xsk->tx.mask = NUM_DESCS - 1;xsk->tx.size = NUM_DESCS;xsk->tx.producer = xsk->tx.map + off.tx.producer;xsk->tx.consumer = xsk->tx.map + off.tx.consumer;xsk->tx.ring = xsk->tx.map + off.tx.desc;xsk->tx.cached_cons = NUM_DESCS;sxdp.sxdp_family = PF_XDP;sxdp.sxdp_ifindex = opt_ifindex;sxdp.sxdp_queue_id = opt_queue;if (shared) {sxdp.sxdp_flags = XDP_SHARED_UMEM;sxdp.sxdp_shared_umem_fd = umem->fd;} else {sxdp.sxdp_flags = opt_xdp_bind_flags;}lassert(bind(sfd, (struct sockaddr *)&sxdp, sizeof(sxdp)) == 0);return xsk;
}
static void print_benchmark(bool running)
{const char *bench_str = "INVALID";if (opt_bench == BENCH_RXDROP)bench_str = "rxdrop";else if (opt_bench == BENCH_TXONLY)bench_str = "txonly";else if (opt_bench == BENCH_L2FWD)bench_str = "l2fwd";printf("%s:%d %s ", opt_if, opt_queue, bench_str);if (opt_xdp_flags & XDP_FLAGS_SKB_MODE)printf("xdp-skb ");else if (opt_xdp_flags & XDP_FLAGS_DRV_MODE)printf("xdp-drv ");elseprintf("    ");if (opt_poll)printf("poll() ");if (running) {printf("running...");fflush(stdout);}
}
static void dump_stats(void)
{unsigned long now = get_nsecs();long dt = now - prev_time;int i;prev_time = now;for (i = 0; i < num_socks && xsks[i]; i++) {char *fmt = "%-15s %'-11.0f %'-11lu\n";double rx_pps, tx_pps;rx_pps = (xsks[i]->rx_npkts - xsks[i]->prev_rx_npkts) *1000000000. / dt;tx_pps = (xsks[i]->tx_npkts - xsks[i]->prev_tx_npkts) *1000000000. / dt;printf("\n sock%d@", i);print_benchmark(false);printf("\n");printf("%-15s %-11s %-11s %-11.2f\n", "", "pps", "pkts",dt / 1000000000.);printf(fmt, "rx", rx_pps, xsks[i]->rx_npkts);printf(fmt, "tx", tx_pps, xsks[i]->tx_npkts);xsks[i]->prev_rx_npkts = xsks[i]->rx_npkts;xsks[i]->prev_tx_npkts = xsks[i]->tx_npkts;}
}
static volatile bool g_running=true;
static void *poller(void *arg)
{(void)arg;while(g_running) {sleep(opt_interval);dump_stats();}return NULL;
}
static void sig_handler(int signo)
{(void)signo;g_running=false;dump_stats();
}
static int do_attach(int fd,u32 xdp_flags,int if_index){struct bpf_prog_info info = {};uint32_t info_len = sizeof(info);int prog_id=-1,err = 0;err = bpf_xdp_attach(if_index, fd, xdp_flags, NULL);if (err < 0) {printf("ERROR: failed to attach program to nic\n");return prog_id;}err = bpf_obj_get_info_by_fd(fd, &info, &info_len);if (err) {printf("can't get prog info - %s\n", strerror(errno));return prog_id;}prog_id = info.id;return prog_id;
}static int do_detach(int prog_id,u32 xdp_flags,int if_index)
{u32 curr_prog_id = 0;int err = 0;err = bpf_xdp_query_id(if_index, xdp_flags, &curr_prog_id);if (err) {printf("bpf_xdp_query_id failed\n");return err;}if (prog_id == curr_prog_id) {err = bpf_xdp_detach(if_index, xdp_flags, NULL);if (err < 0)printf("ERROR: failed to detach prog from nic\n");} else if (!curr_prog_id) {printf("couldn't find a prog id on nic\n");} else {printf("program on interface changed, not removing\n");}return err;
}static struct option long_options[] = {{"rxdrop", no_argument, 0, 'r'},{"txonly", no_argument, 0, 't'},{"l2fwd", no_argument, 0, 'l'},{"interface", required_argument, 0, 'i'},{"queue", required_argument, 0, 'q'},{"poll", no_argument, 0, 'p'},{"shared-buffer", no_argument, 0, 's'},{"xdp-skb", no_argument, 0, 'S'},{"xdp-native", no_argument, 0, 'N'},{"interval", required_argument, 0, 'n'},{"zero-copy", no_argument, 0, 'z'},{"copy", no_argument, 0, 'c'},{0, 0, 0, 0}
};
static void usage(const char *prog)
{const char *str ="  Usage: %s [OPTIONS]\n""  Options:\n""  -r, --rxdrop      Discard all incoming packets (default)\n""  -t, --txonly      Only send packets\n""  -l, --l2fwd        MAC swap L2 forwarding\n""  -i, --interface=n    Run on interface n\n""  -q, --queue=n    Use queue n (default 0)\n""  -p, --poll       Use poll syscall\n""  -s, --shared-buffer Use shared packet buffer\n""  -S, --xdp-skb=n    Use XDP skb-mod\n""  -N, --xdp-native=n  Enfore XDP native mode\n""  -n, --interval=n Specify statistics update interval (default 1 sec).\n""  -z, --zero-copy      Force zero-copy mode.\n""  -c, --copy           Force copy mode.\n""\n";fprintf(stderr, str, prog);exit(EXIT_FAILURE);
}
static void parse_command_line(int argc, char **argv)
{int option_index, c;opterr = 0;for (;;) {c = getopt_long(argc, argv, "rtli:q:psSNn:cz", long_options,&option_index);if (c == -1)break;switch (c) {case 'r':opt_bench = BENCH_RXDROP;break;case 't':opt_bench = BENCH_TXONLY;break;case 'l':opt_bench = BENCH_L2FWD;break;case 'i':opt_if = optarg;break;case 'q':opt_queue = atoi(optarg);break;case 's':opt_shared_packet_buffer = 1;break;case 'p':opt_poll = 1;break;case 'S':opt_xdp_flags |= XDP_FLAGS_SKB_MODE;opt_xdp_bind_flags |= XDP_COPY;break;case 'N':opt_xdp_flags |= XDP_FLAGS_DRV_MODE;break;case 'n':opt_interval = atoi(optarg);break;case 'z':opt_xdp_bind_flags |= XDP_ZEROCOPY;break;case 'c':opt_xdp_bind_flags |= XDP_COPY;break;default:usage(basename(argv[0]));}}opt_ifindex = if_nametoindex(opt_if);if (!opt_ifindex) {fprintf(stderr, "ERROR: interface \"%s\" does not exist\n",opt_if);usage(basename(argv[0]));}
}
static void kick_tx(int fd)
{int ret;ret = sendto(fd, NULL, 0, MSG_DONTWAIT, NULL, 0);if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN || errno == EBUSY)return;lassert(0);
}
static inline void complete_tx_l2fwd(struct xdpsock *xsk)
{u64 descs[BATCH_SIZE];unsigned int rcvd;size_t ndescs;if (!xsk->outstanding_tx)return;kick_tx(xsk->sfd);ndescs = (xsk->outstanding_tx > BATCH_SIZE) ? BATCH_SIZE :xsk->outstanding_tx;/* re-add completed Tx buffers */rcvd = umem_complete_from_kernel(&xsk->umem->cq, descs, ndescs);if (rcvd > 0) {umem_fill_to_kernel(&xsk->umem->fq, descs, rcvd);xsk->outstanding_tx -= rcvd;xsk->tx_npkts += rcvd;}
}
static inline void complete_tx_only(struct xdpsock *xsk)
{u64 descs[BATCH_SIZE];unsigned int rcvd;if (!xsk->outstanding_tx)return;kick_tx(xsk->sfd);rcvd = umem_complete_from_kernel(&xsk->umem->cq, descs, BATCH_SIZE);if (rcvd > 0) {xsk->outstanding_tx -= rcvd;xsk->tx_npkts += rcvd;}
}
//http://blog.chinaunix.net/uid-30012596-id-4729018.html
#include <net/ethernet.h>
#include <netinet/ether.h>//ether_ntoa
#include <netinet/ip.h>
#include<sys/socket.h>
static void print_pkt_info(const char *pkt, size_t sz){const struct ethhdr * eth_hdr=(const struct ethhdr*)pkt;int offset = sizeof(*eth_hdr);printf("recv packet length %d\n",sz);/*for (int i = 0; i <ETH_ALEN; ++i)printf(" %02x", (unsigned char)eth_hdr->h_source[i]);printf("\n");for (int i = 0; i <ETH_ALEN; ++i)printf(" %02x", (unsigned char)eth_hdr->h_dest[i]);printf("\n");*/printf("src mac:%s,",ether_ntoa((struct ether_addr*)&(eth_hdr->h_source)));if(0==memcmp(eth_hdr->h_source,eth_hdr->h_dest,ETH_ALEN)){printf("dst mac=src mac");}if(sz>offset){const struct iphdr *ip_hdr = (const struct iphdr*)(pkt + offset);printf("ip version %d,proto %d\n",ip_hdr->version,ip_hdr->protocol);}
}
static void rx_drop(struct xdpsock *xsk)
{struct xdp_desc descs[BATCH_SIZE];unsigned int rcvd, i;rcvd = xq_deq(&xsk->rx, descs, BATCH_SIZE);if (!rcvd)return;for (i = 0; i < rcvd; i++) {char *pkt = xq_get_data(xsk, descs[i].addr);//hex_dump(pkt, descs[i].len, descs[i].addr);print_pkt_info(pkt,descs[i].len);}xsk->rx_npkts += rcvd;umem_fill_to_kernel_ex(&xsk->umem->fq, descs, rcvd);
}
static void rx_drop_all(void)
{struct pollfd fds[MAX_SOCKS + 1];int i, ret, timeout, nfds = 1;memset(fds, 0, sizeof(fds));printf("run %s\n",__FUNCTION__);for (i = 0; i < num_socks; i++) {fds[i].fd = xsks[i]->sfd;fds[i].events = POLLIN;timeout = 1000; /* 1sn */}while(g_running) {if (opt_poll) {ret = poll(fds, nfds, timeout);if (ret <= 0)continue;}for (i = 0; i < num_socks; i++)rx_drop(xsks[i]);}
}
static void tx_only(struct xdpsock *xsk)
{int timeout, ret, nfds = 1;struct pollfd fds[nfds + 1];unsigned int idx = 0;memset(fds, 0, sizeof(fds));fds[0].fd = xsk->sfd;fds[0].events = POLLOUT;timeout = 1000; /* 1sn */while(g_running) {if (opt_poll) {ret = poll(fds, nfds, timeout);if (ret <= 0)continue;if (fds[0].fd != xsk->sfd ||!(fds[0].revents & POLLOUT))continue;}if (xq_nb_free(&xsk->tx, BATCH_SIZE) >= BATCH_SIZE) {lassert(xq_enq_tx_only(&xsk->tx, idx, BATCH_SIZE) == 0);xsk->outstanding_tx += BATCH_SIZE;idx += BATCH_SIZE;idx %= NUM_FRAMES;}complete_tx_only(xsk);}
}
static void l2fwd(struct xdpsock *xsk)
{while(g_running){struct xdp_desc descs[BATCH_SIZE];unsigned int rcvd, i;int ret;for (;;) {complete_tx_l2fwd(xsk);rcvd = xq_deq(&xsk->rx, descs, BATCH_SIZE);if (rcvd > 0)break;}for (i = 0; i < rcvd; i++) {char *pkt = xq_get_data(xsk, descs[i].addr);swap_mac_addresses(pkt);hex_dump(pkt, descs[i].len, descs[i].addr);}xsk->rx_npkts += rcvd;ret = xq_enq(&xsk->tx, descs, rcvd);lassert(ret == 0);xsk->outstanding_tx += rcvd;}
}
// ./xdpsock -r -i wlxe0e1a997ab49 -q 0 -n 5 -S
int main(int argc, char **argv)
{struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};int prog_fd, qidconf_map, xsks_map;struct bpf_object *obj=NULL;char xdp_filename[256];struct bpf_map *map;int i, ret, key = 0;pthread_t pt;if (signal(SIGINT, sig_handler) ||signal(SIGHUP, sig_handler) ||signal(SIGTERM, sig_handler)||signal(SIGTSTP,sig_handler)){perror("signal");return 1;}parse_command_line(argc, argv);if (setrlimit(RLIMIT_MEMLOCK, &r)) {fprintf(stderr, "ERROR: setrlimit(RLIMIT_MEMLOCK) \"%s\"\n",strerror(errno));exit(EXIT_FAILURE);}snprintf(xdp_filename, sizeof(xdp_filename), "%s_kern.o", argv[0]);if(opt_ifindex){struct bpf_program *prog;const char *qidconf_map_name="qidconf_map";const char *xsks_map_name="xsks_map";obj = bpf_object__open_file(xdp_filename, NULL);if (libbpf_get_error(obj)){return 1;}prog = bpf_object__next_program(obj, NULL);bpf_program__set_type(prog, BPF_PROG_TYPE_XDP);if(prog){const char *sec_name = bpf_program__section_name(prog);printf("sec:%s\n",sec_name);}int err = bpf_object__load(obj);if (err){bpf_object__close(obj);return 1;}prog_fd = bpf_program__fd(prog);map =bpf_object__find_map_by_name(obj,qidconf_map_name);if(map){printf("finding %s \n",qidconf_map_name);}else{printf("finding %s failed\n",qidconf_map_name);bpf_object__close(obj);return 1;}qidconf_map = bpf_map__fd(map);if(qidconf_map < 0){fprintf(stderr, "ERROR: no qidconf map found: %s\n",strerror(qidconf_map));bpf_object__close(obj);return 1;}map = bpf_object__find_map_by_name(obj,xsks_map_name);xsks_map = bpf_map__fd(map);if (xsks_map < 0) {fprintf(stderr, "ERROR: no xsks map found: %s\n",strerror(xsks_map));bpf_object__close(obj);return 1;}}else{printf("nic does not exist\n");bpf_object__close(obj);return 1;}int prog_id=-1;printf("%s,%d\n",opt_if,opt_ifindex);prog_id=do_attach(prog_fd,opt_xdp_flags,opt_ifindex);ret = bpf_map_update_elem(qidconf_map, &key, &opt_queue, 0);if (ret) {fprintf(stderr, "ERROR: bpf_map_update_elem qidconf\n");bpf_object__close(obj);exit(EXIT_FAILURE);}xsks[num_socks++] = xsk_configure(NULL);
#if RR_LBfor (i = 0; i < MAX_SOCKS - 1; i++)xsks[num_socks++] = xsk_configure(xsks[0]->umem);
#endif// ...and insert them into the map. for (i = 0; i < num_socks; i++) {key = i;ret = bpf_map_update_elem(xsks_map, &key, &xsks[i]->sfd, 0);if (ret) {fprintf(stderr, "ERROR: bpf_map_update_elem %d\n", i);bpf_object__close(obj);exit(EXIT_FAILURE);}}setlocale(LC_ALL, "");ret = pthread_create(&pt, NULL, poller, NULL);lassert(ret == 0);prev_time = get_nsecs();if (opt_bench == BENCH_RXDROP)rx_drop_all();else if (opt_bench == BENCH_TXONLY)tx_only(xsks[0]);elsel2fwd(xsks[0]);do_detach(prog_id,opt_xdp_flags,opt_ifindex);bpf_object__close(obj);return 0;
}

CMakeLists.txt

PROJECT(project)
cmake_minimum_required(VERSION 2.6)
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -Wall  -O2")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -Wall -O2")
SET(CMAKE_CXX_FLAGS "-fPIC")#for libbpf
set(LIBBPF_DIR /build/root/usr)
include_directories(${LIBBPF_DIR}/include)
LINK_DIRECTORIES(${LIBBPF_DIR}/lib64)set(EXECUTABLE_NAME "xdpsock")
add_executable(${EXECUTABLE_NAME} ${CMAKE_SOURCE_DIR}/xdpsock_user.c)
target_link_libraries(${EXECUTABLE_NAME} bpf pthread)
#cmake .. -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++

xdpsock_user.c的编译步骤：

mkdir build && cd build
cmake .. -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++
make

运行步骤，wlxe0e1a997ab49是我的网卡名字，请替换：

sudo su
./xdpsock -r -i wlxe0e1a997ab49 -q 0 -n 5 -S

Referenec
[1]xdp测试例子
[2]xdpsock_user.c in linux
[3]AF_XDP技术详解
[4]借助libbpf/libxdp使用AF_XDP，我们都需要做什么

AF_XDP socket 测试相关推荐

Socket测试工具（客户端、服务端）
Socket是什么? SOCKET用于在两个基于TCP/IP协议的应用程序之间相互通信.最早出现在UNIX系统中,是UNIX系统主要的信息传递方式.在WINDOWS系统中,SOCKET称为WINSOC ...
Loadrunner socket测试内容总结
socket简介这里请大家自行百度.这里测的是基于tcp的长连接socket,简单点说,不同于平时测试的web应用,socket像打电话一样,需要接通-保持通信-断开,且这三个应该是一个完整的过程, ...
socket 测试工具_Soloπ：支付宝开源的Android专项测试工具
1.前言近年来,随着移动互联网的蓬勃发展,移动测试技术也取得了长足的进步,从早期基于测试脚本的单机自动化,到录制回放.图像识别.云测平台等测试技术贴合实际业务需求深度应用和创新,测试效率从而一次又一 ...
三、Socket测试示例
一.WebSocket插件已安装不知道安装哪个插件的,小伙伴,可以看这篇文章哦二.WebSocket测试打开Jmeter后,添加线程组,右键添加取样器添加成功后,如下图所示: 参数简介如下: ...
转载一个很经典的--C# Socket TCP和UDP报文及端口测试工具的开发（提供源码）
转载地址:http://www.ltmonitor.com/blog/?p=285 因为自己经常做Socket开发,经常要调试各种协议,如TCP.UDP和SIP等协议,还要维护多个服务器端和客户端的通 ...
自行控制loadrunner的socket协议性能测试（转）
一前言二任务的提出三实现方案讨论四技术要点讲解如何开始录制一个最简单的收发数据包脚本写日志文件一行一行读数据包文件字符串转换为十六进制数据包发送自己定义的数据包接收数据包到自定义缓冲 ...
Java socket中关闭IO流后，发生什么事？（以关闭输出流为例）
为了方便讲解,我们把 DataOutputstream dout = new DataOutputStream(new BufferedOutputStream(mySocket.getOutputS ...
socket 获取回传信息_Luat系列官方教程5：Socket代码详解
文章篇幅较长,代码部分建议横屏查看,或在PC端打开本文链接.文末依然为爱学习的你准备了专属福利~ TCP和UDP除了在Lua代码声明时有一些不同,其他地方完全一样,所以下面的代码将以TCP长连接的数据 ...
tcp 测试软件,ztcp
软件简介 ztcp 是一个发送 TCP 命令的工具,本项目采用 go 语言编写,提供一个 tcp 客户端,专门用作各种 socket 测试,HTTP 测试.尤其是对 AJAX 请求很便利的支持. 安装 ...

AF_XDP socket 测试

AF_XDP socket 测试相关推荐

最新文章

热门文章