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samples/bpf: sample application and documentation for AF_XDP sockets

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This is a sample application for AF_XDP sockets. The application
supports three different modes of operation: rxdrop, txonly and l2fwd.

To show-case a simple round-robin load-balancing between a set of
sockets in an xskmap, set the RR_LB compile time define option to 1 in
"xdpsock.h".

v2: The entries variable was calculated twice in {umem,xq}_nb_avail.

Co-authored-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Magnus Karlsson
2018-05-02 13:01:36 +02:00
committed by Alexei Starovoitov
parent af75d9e02d
commit b4b8faa1de
6 changed files with 1317 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
samples/bpf/Makefile
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@@ -45,6 +45,7 @@ hostprogs-y += xdp_rxq_info
hostprogs-y += syscall_tp
hostprogs-y += cpustat
hostprogs-y += xdp_adjust_tail
hostprogs-y += xdpsock
# Libbpf dependencies
LIBBPF := ../../tools/lib/bpf/bpf.o ../../tools/lib/bpf/nlattr.o
@@ -98,6 +99,7 @@ xdp_rxq_info-objs := bpf_load.o $(LIBBPF) xdp_rxq_info_user.o
syscall_tp-objs := bpf_load.o $(LIBBPF) syscall_tp_user.o
cpustat-objs := bpf_load.o $(LIBBPF) cpustat_user.o
xdp_adjust_tail-objs := bpf_load.o $(LIBBPF) xdp_adjust_tail_user.o
xdpsock-objs := bpf_load.o $(LIBBPF) xdpsock_user.o
# Tell kbuild to always build the programs
always := $(hostprogs-y)
@@ -151,6 +153,7 @@ always += xdp2skb_meta_kern.o
always += syscall_tp_kern.o
always += cpustat_kern.o
always += xdp_adjust_tail_kern.o
always += xdpsock_kern.o
HOSTCFLAGS += -I$(objtree)/usr/include
HOSTCFLAGS += -I$(srctree)/tools/lib/
@@ -197,6 +200,7 @@ HOSTLOADLIBES_xdp_rxq_info += -lelf
HOSTLOADLIBES_syscall_tp += -lelf
HOSTLOADLIBES_cpustat += -lelf
HOSTLOADLIBES_xdp_adjust_tail += -lelf
HOSTLOADLIBES_xdpsock += -lelf -pthread
# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang

11
samples/bpf/xdpsock.h Normal file
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@@ -0,0 +1,11 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef XDPSOCK_H_
#define XDPSOCK_H_
/* Power-of-2 number of sockets */
#define MAX_SOCKS 4
/* Round-robin receive */
#define RR_LB 0
#endif /* XDPSOCK_H_ */

56
samples/bpf/xdpsock_kern.c Normal file
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@@ -0,0 +1,56 @@
// SPDX-License-Identifier: GPL-2.0
#define KBUILD_MODNAME "foo"
#include <uapi/linux/bpf.h>
#include "bpf_helpers.h"
#include "xdpsock.h"
struct bpf_map_def SEC("maps") qidconf_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(int),
.max_entries = 1,
};
struct bpf_map_def SEC("maps") xsks_map = {
.type = BPF_MAP_TYPE_XSKMAP,
.key_size = sizeof(int),
.value_size = sizeof(int),
.max_entries = 4,
};
struct bpf_map_def SEC("maps") rr_map = {
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(unsigned int),
.max_entries = 1,
};
SEC("xdp_sock")
int xdp_sock_prog(struct xdp_md *ctx)
{
int *qidconf, key = 0, idx;
unsigned int *rr;
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;
#else
idx = 0;
#endif
return bpf_redirect_map(&xsks_map, idx, 0);
}
char _license[] SEC("license") = "GPL";

948
samples/bpf/xdpsock_user.c Normal file
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@@ -0,0 +1,948 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2017 - 2018 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#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_load.h"
#include "bpf_util.h"
#include "libbpf.h"
#include "xdpsock.h"
#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_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 __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;
struct xdp_umem_uqueue {
u32 cached_prod;
u32 cached_cons;
u32 mask;
u32 size;
struct xdp_umem_ring *ring;
};
struct xdp_umem {
char (*frames)[FRAME_SIZE];
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;
struct xdp_rxtx_ring *ring;
};
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;
};
#define MAX_SOCKS 4
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")
#define u_smp_rmb() barrier()
#define u_smp_wmb() barrier()
#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->size - (q->cached_prod - q->cached_cons);
if (free_entries >= nb)
return free_entries;
/* Refresh the local tail pointer */
q->cached_cons = q->ring->ptrs.consumer;
return q->size - (q->cached_prod - q->cached_cons);
}
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->ring->ptrs.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->ring->ptrs.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->ring->ptrs.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->desc[idx] = d[i].idx;
}
u_smp_wmb();
fq->ring->ptrs.producer = fq->cached_prod;
return 0;
}
static inline int umem_fill_to_kernel(struct xdp_umem_uqueue *fq, u32 *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->desc[idx] = d[i];
}
u_smp_wmb();
fq->ring->ptrs.producer = fq->cached_prod;
return 0;
}
static inline size_t umem_complete_from_kernel(struct xdp_umem_uqueue *cq,
u32 *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->desc[idx];
}
if (entries > 0) {
u_smp_wmb();
cq->ring->ptrs.consumer = cq->cached_cons;
}
return entries;
}
static inline void *xq_get_data(struct xdpsock *xsk, __u32 idx, __u32 off)
{
lassert(idx < NUM_FRAMES);
return &xsk->umem->frames[idx][off];
}
static inline int xq_enq(struct xdp_uqueue *uq,
const struct xdp_desc *descs,
unsigned int ndescs)
{
struct xdp_rxtx_ring *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->desc[idx].idx = descs[i].idx;
r->desc[idx].len = descs[i].len;
r->desc[idx].offset = descs[i].offset;
}
u_smp_wmb();
r->ptrs.producer = uq->cached_prod;
return 0;
}
static inline int xq_enq_tx_only(struct xdp_uqueue *uq,
__u32 idx, unsigned int ndescs)
{
struct xdp_rxtx_ring *q = 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;
q->desc[idx].idx = idx + i;
q->desc[idx].len = sizeof(pkt_data) - 1;
q->desc[idx].offset = 0;
}
u_smp_wmb();
q->ptrs.producer = uq->cached_prod;
return 0;
}
static inline int xq_deq(struct xdp_uqueue *uq,
struct xdp_desc *descs,
int ndescs)
{
struct xdp_rxtx_ring *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->desc[idx];
}
if (entries > 0) {
u_smp_wmb();
r->ptrs.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;
}
#if DEBUG_HEXDUMP
static void hex_dump(void *pkt, size_t length, const char *prefix)
{
int i = 0;
const unsigned char *address = (unsigned char *)pkt;
const unsigned char *line = address;
size_t line_size = 32;
unsigned char c;
printf("length = %zu\n", length);
printf("%s | ", prefix);
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 | ", prefix);
}
}
printf("\n");
}
#endif
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_umem_reg mr;
struct xdp_umem *umem;
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.frame_size = FRAME_SIZE;
mr.frame_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);
umem->fq.ring = mmap(0, sizeof(struct xdp_umem_ring) +
FQ_NUM_DESCS * sizeof(u32),
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, sfd,
XDP_UMEM_PGOFF_FILL_RING);
lassert(umem->fq.ring != MAP_FAILED);
umem->fq.mask = FQ_NUM_DESCS - 1;
umem->fq.size = FQ_NUM_DESCS;
umem->cq.ring = mmap(0, sizeof(struct xdp_umem_ring) +
CQ_NUM_DESCS * sizeof(u32),
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, sfd,
XDP_UMEM_PGOFF_COMPLETION_RING);
lassert(umem->cq.ring != MAP_FAILED);
umem->cq.mask = CQ_NUM_DESCS - 1;
umem->cq.size = CQ_NUM_DESCS;
umem->frames = (char (*)[FRAME_SIZE])bufs;
umem->fd = sfd;
if (opt_bench == BENCH_TXONLY) {
int i;
for (i = 0; i < NUM_FRAMES; i++)
(void)gen_eth_frame(&umem->frames[i][0]);
}
return umem;
}
static struct xdpsock *xsk_configure(struct xdp_umem *umem)
{
struct sockaddr_xdp sxdp = {};
int sfd, ndescs = NUM_DESCS;
struct xdpsock *xsk;
bool shared = true;
u32 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);
/* Rx */
xsk->rx.ring = mmap(NULL,
sizeof(struct xdp_ring) +
NUM_DESCS * sizeof(struct xdp_desc),
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, sfd,
XDP_PGOFF_RX_RING);
lassert(xsk->rx.ring != MAP_FAILED);
if (!shared) {
for (i = 0; i < NUM_DESCS / 2; i++)
lassert(umem_fill_to_kernel(&xsk->umem->fq, &i, 1)
== 0);
}
/* Tx */
xsk->tx.ring = mmap(NULL,
sizeof(struct xdp_ring) +
NUM_DESCS * sizeof(struct xdp_desc),
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE, sfd,
XDP_PGOFF_TX_RING);
lassert(xsk->tx.ring != MAP_FAILED);
xsk->rx.mask = NUM_DESCS - 1;
xsk->rx.size = NUM_DESCS;
xsk->tx.mask = NUM_DESCS - 1;
xsk->tx.size = 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;
}
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 ");
else
printf(" ");
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; 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 void *poller(void *arg)
{
(void)arg;
for (;;) {
sleep(opt_interval);
dump_stats();
}
return NULL;
}
static void int_exit(int sig)
{
(void)sig;
dump_stats();
bpf_set_link_xdp_fd(opt_ifindex, -1, opt_xdp_flags);
exit(EXIT_SUCCESS);
}
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'},
{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"
"\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:", 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;
break;
case 'N':
opt_xdp_flags |= XDP_FLAGS_DRV_MODE;
break;
case 'n':
opt_interval = atoi(optarg);
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)
return;
lassert(0);
}
static inline void complete_tx_l2fwd(struct xdpsock *xsk)
{
u32 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)
{
u32 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;
}
}
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++) {
u32 idx = descs[i].idx;
lassert(idx < NUM_FRAMES);
#if DEBUG_HEXDUMP
char *pkt;
char buf[32];
pkt = xq_get_data(xsk, idx, descs[i].offset);
sprintf(buf, "idx=%d", idx);
hex_dump(pkt, descs[i].len, buf);
#endif
}
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));
for (i = 0; i < num_socks; i++) {
fds[i].fd = xsks[i]->sfd;
fds[i].events = POLLIN;
timeout = 1000; /* 1sn */
}
for (;;) {
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 */
for (;;) {
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)
{
for (;;) {
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].idx,
descs[i].offset);
swap_mac_addresses(pkt);
#if DEBUG_HEXDUMP
char buf[32];
u32 idx = descs[i].idx;
sprintf(buf, "idx=%d", idx);
hex_dump(pkt, descs[i].len, buf);
#endif
}
xsk->rx_npkts += rcvd;
ret = xq_enq(&xsk->tx, descs, rcvd);
lassert(ret == 0);
xsk->outstanding_tx += rcvd;
}
}
int main(int argc, char **argv)
{
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
char xdp_filename[256];
int i, ret, key = 0;
pthread_t pt;
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 (load_bpf_file(xdp_filename)) {
fprintf(stderr, "ERROR: load_bpf_file %s\n", bpf_log_buf);
exit(EXIT_FAILURE);
}
if (!prog_fd[0]) {
fprintf(stderr, "ERROR: load_bpf_file: \"%s\"\n",
strerror(errno));
exit(EXIT_FAILURE);
}
if (bpf_set_link_xdp_fd(opt_ifindex, prog_fd[0], opt_xdp_flags) < 0) {
fprintf(stderr, "ERROR: link set xdp fd failed\n");
exit(EXIT_FAILURE);
}
ret = bpf_map_update_elem(map_fd[0], &key, &opt_queue, 0);
if (ret) {
fprintf(stderr, "ERROR: bpf_map_update_elem qidconf\n");
exit(EXIT_FAILURE);
}
/* Create sockets... */
xsks[num_socks++] = xsk_configure(NULL);
#if RR_LB
for (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(map_fd[1], &key, &xsks[i]->sfd, 0);
if (ret) {
fprintf(stderr, "ERROR: bpf_map_update_elem %d\n", i);
exit(EXIT_FAILURE);
}
}
signal(SIGINT, int_exit);
signal(SIGTERM, int_exit);
signal(SIGABRT, int_exit);
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]);
else
l2fwd(xsks[0]);
return 0;
}