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authorMaxim Mikityanskiy <maximmi@mellanox.com>2019-06-26 14:35:27 (GMT)
committerDaniel Borkmann <daniel@iogearbox.net>2019-06-27 20:53:26 (GMT)
commit123e8da1d33042a83cedb530fb5efd64f32ce594 (patch)
tree747874074537addeea7a217af8aaaeeaf512331e /samples
parent2761ed4b6e192820760d5ba913834b2ba05fd08c (diff)
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xsk: Change the default frame size to 4096 and allow controlling it
The typical XDP memory scheme is one packet per page. Change the AF_XDP frame size in libbpf to 4096, which is the page size on x86, to allow libbpf to be used with the drivers with the packet-per-page scheme. Add a command line option -f to xdpsock to allow to specify a custom frame size. Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com> Signed-off-by: Tariq Toukan <tariqt@mellanox.com> Acked-by: Saeed Mahameed <saeedm@mellanox.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/xdpsock_user.c44
1 files changed, 28 insertions, 16 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 0f5eb0d..93eaaf7 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -68,6 +68,7 @@ static int opt_queue;
static int opt_poll;
static int opt_interval = 1;
static u32 opt_xdp_bind_flags;
+static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
static __u32 prog_id;
struct xsk_umem_info {
@@ -276,6 +277,12 @@ static size_t gen_eth_frame(struct xsk_umem_info *umem, u64 addr)
static struct xsk_umem_info *xsk_configure_umem(void *buffer, u64 size)
{
struct xsk_umem_info *umem;
+ struct xsk_umem_config cfg = {
+ .fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
+ .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
+ .frame_size = opt_xsk_frame_size,
+ .frame_headroom = XSK_UMEM__DEFAULT_FRAME_HEADROOM,
+ };
int ret;
umem = calloc(1, sizeof(*umem));
@@ -283,7 +290,7 @@ static struct xsk_umem_info *xsk_configure_umem(void *buffer, u64 size)
exit_with_error(errno);
ret = xsk_umem__create(&umem->umem, buffer, size, &umem->fq, &umem->cq,
- NULL);
+ &cfg);
if (ret)
exit_with_error(-ret);
@@ -323,11 +330,9 @@ static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem)
&idx);
if (ret != XSK_RING_PROD__DEFAULT_NUM_DESCS)
exit_with_error(-ret);
- for (i = 0;
- i < XSK_RING_PROD__DEFAULT_NUM_DESCS *
- XSK_UMEM__DEFAULT_FRAME_SIZE;
- i += XSK_UMEM__DEFAULT_FRAME_SIZE)
- *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx++) = i;
+ for (i = 0; i < XSK_RING_PROD__DEFAULT_NUM_DESCS; i++)
+ *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx++) =
+ i * opt_xsk_frame_size;
xsk_ring_prod__submit(&xsk->umem->fq,
XSK_RING_PROD__DEFAULT_NUM_DESCS);
@@ -346,6 +351,7 @@ static struct option long_options[] = {
{"interval", required_argument, 0, 'n'},
{"zero-copy", no_argument, 0, 'z'},
{"copy", no_argument, 0, 'c'},
+ {"frame-size", required_argument, 0, 'f'},
{0, 0, 0, 0}
};
@@ -365,8 +371,9 @@ static void usage(const char *prog)
" -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"
+ " -f, --frame-size=n Set the frame size (must be a power of two, default is %d).\n"
"\n";
- fprintf(stderr, str, prog);
+ fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE);
exit(EXIT_FAILURE);
}
@@ -377,7 +384,7 @@ static void parse_command_line(int argc, char **argv)
opterr = 0;
for (;;) {
- c = getopt_long(argc, argv, "Frtli:q:psSNn:cz", long_options,
+ c = getopt_long(argc, argv, "Frtli:q:psSNn:czf:", long_options,
&option_index);
if (c == -1)
break;
@@ -420,6 +427,9 @@ static void parse_command_line(int argc, char **argv)
case 'F':
opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
break;
+ case 'f':
+ opt_xsk_frame_size = atoi(optarg);
+ break;
default:
usage(basename(argv[0]));
}
@@ -432,6 +442,11 @@ static void parse_command_line(int argc, char **argv)
usage(basename(argv[0]));
}
+ if (opt_xsk_frame_size & (opt_xsk_frame_size - 1)) {
+ fprintf(stderr, "--frame-size=%d is not a power of two\n",
+ opt_xsk_frame_size);
+ usage(basename(argv[0]));
+ }
}
static void kick_tx(struct xsk_socket_info *xsk)
@@ -583,8 +598,7 @@ static void tx_only(struct xsk_socket_info *xsk)
for (i = 0; i < BATCH_SIZE; i++) {
xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->addr
- = (frame_nb + i) <<
- XSK_UMEM__DEFAULT_FRAME_SHIFT;
+ = (frame_nb + i) * opt_xsk_frame_size;
xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->len =
sizeof(pkt_data) - 1;
}
@@ -661,21 +675,19 @@ int main(int argc, char **argv)
}
ret = posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */
- NUM_FRAMES * XSK_UMEM__DEFAULT_FRAME_SIZE);
+ NUM_FRAMES * opt_xsk_frame_size);
if (ret)
exit_with_error(ret);
/* Create sockets... */
- umem = xsk_configure_umem(bufs,
- NUM_FRAMES * XSK_UMEM__DEFAULT_FRAME_SIZE);
+ umem = xsk_configure_umem(bufs, NUM_FRAMES * opt_xsk_frame_size);
xsks[num_socks++] = xsk_configure_socket(umem);
if (opt_bench == BENCH_TXONLY) {
int i;
- for (i = 0; i < NUM_FRAMES * XSK_UMEM__DEFAULT_FRAME_SIZE;
- i += XSK_UMEM__DEFAULT_FRAME_SIZE)
- (void)gen_eth_frame(umem, i);
+ for (i = 0; i < NUM_FRAMES; i++)
+ (void)gen_eth_frame(umem, i * opt_xsk_frame_size);
}
signal(SIGINT, int_exit);