aboutsummaryrefslogtreecommitdiff
path: root/samples/bpf
diff options
context:
space:
mode:
authorBjörn Töpel <bjorn.topel@intel.com>2020-11-30 19:52:03 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2020-12-01 00:09:25 +0100
commit284cbc61f851bf86326b28acfe6d161691d4a4ed (patch)
treec44687179178a42a5ebaead86c51d41f8489334c /samples/bpf
parentf2d2728220ac6482c69c5f018ec09bafd688e7d1 (diff)
downloadlinux-stericsson-284cbc61f851bf86326b28acfe6d161691d4a4ed.tar.gz
samples/bpf: Use recvfrom() in xdpsock/l2fwd
Start using recvfrom() the l2fwd scenario, instead of poll() which is more expensive and need additional knobs for busy-polling. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Magnus Karlsson <magnus.karlsson@intel.com> Link: https://lore.kernel.org/bpf/20201130185205.196029-9-bjorn.topel@gmail.com
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/xdpsock_user.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index f90111b95b2e..a1a3d6f02ba9 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -1098,8 +1098,7 @@ static void kick_tx(struct xsk_socket_info *xsk)
exit_with_error(errno);
}
-static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
- struct pollfd *fds)
+static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
{
struct xsk_umem_info *umem = xsk->umem;
u32 idx_cq = 0, idx_fq = 0;
@@ -1134,7 +1133,8 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
exit_with_error(-ret);
if (xsk_ring_prod__needs_wakeup(&umem->fq)) {
xsk->app_stats.fill_fail_polls++;
- ret = poll(fds, num_socks, opt_timeout);
+ recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL,
+ NULL);
}
ret = xsk_ring_prod__reserve(&umem->fq, rcvd, &idx_fq);
}
@@ -1331,19 +1331,19 @@ static void tx_only_all(void)
complete_tx_only_all();
}
-static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
+static void l2fwd(struct xsk_socket_info *xsk)
{
unsigned int rcvd, i;
u32 idx_rx = 0, idx_tx = 0;
int ret;
- complete_tx_l2fwd(xsk, fds);
+ complete_tx_l2fwd(xsk);
rcvd = xsk_ring_cons__peek(&xsk->rx, opt_batch_size, &idx_rx);
if (!rcvd) {
if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
xsk->app_stats.rx_empty_polls++;
- ret = poll(fds, num_socks, opt_timeout);
+ recvfrom(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, NULL);
}
return;
}
@@ -1353,7 +1353,7 @@ static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
while (ret != rcvd) {
if (ret < 0)
exit_with_error(-ret);
- complete_tx_l2fwd(xsk, fds);
+ complete_tx_l2fwd(xsk);
if (xsk_ring_prod__needs_wakeup(&xsk->tx)) {
xsk->app_stats.tx_wakeup_sendtos++;
kick_tx(xsk);
@@ -1388,22 +1388,20 @@ static void l2fwd_all(void)
struct pollfd fds[MAX_SOCKS] = {};
int i, ret;
- for (i = 0; i < num_socks; i++) {
- fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
- fds[i].events = POLLOUT | POLLIN;
- }
-
for (;;) {
if (opt_poll) {
- for (i = 0; i < num_socks; i++)
+ for (i = 0; i < num_socks; i++) {
+ fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
+ fds[i].events = POLLOUT | POLLIN;
xsks[i]->app_stats.opt_polls++;
+ }
ret = poll(fds, num_socks, opt_timeout);
if (ret <= 0)
continue;
}
for (i = 0; i < num_socks; i++)
- l2fwd(xsks[i], fds);
+ l2fwd(xsks[i]);
if (benchmark_done)
break;