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Message-Id: <20201002133612.31536-2-ciara.loftus@intel.com>
Date: Fri, 2 Oct 2020 13:36:11 +0000
From: Ciara Loftus <ciara.loftus@...el.com>
To: bpf@...r.kernel.org, netdev@...r.kernel.org
Cc: Ciara Loftus <ciara.loftus@...el.com>
Subject: [PATCH bpf-next 2/3] samples: bpf: count syscalls in xdpsock
Categorise and record syscalls issued in the xdpsock sample app. The
categories recorded are:
rx_empty_polls: polls when the rx ring is empty
fill_fail_polls: polls when failed to get addr from fill ring
copy_tx_sendtos: sendtos issued for tx when copy mode enabled
tx_wakeup_sendtos: sendtos issued when tx ring needs waking up
opt_polls: polls issued since the '-p' flag is set
Print the stats using '-a' on the xdpsock command line.
Signed-off-by: Ciara Loftus <ciara.loftus@...el.com>
---
samples/bpf/xdpsock_user.c | 113 +++++++++++++++++++++++++++++++++----
1 file changed, 103 insertions(+), 10 deletions(-)
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 4c5022e6479e..ff119ede4ab1 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -79,6 +79,7 @@ static u16 opt_pkt_size = MIN_PKT_SIZE;
static u32 opt_pkt_fill_pattern = 0x12345678;
static bool opt_extra_stats;
static bool opt_quiet;
+static bool opt_app_stats;
static int opt_poll;
static int opt_interval = 1;
static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
@@ -110,6 +111,19 @@ struct xsk_ring_stats {
unsigned long prev_tx_empty_npkts;
};
+struct xsk_app_stats {
+ unsigned long rx_empty_polls;
+ unsigned long fill_fail_polls;
+ unsigned long copy_tx_sendtos;
+ unsigned long tx_wakeup_sendtos;
+ unsigned long opt_polls;
+ unsigned long prev_rx_empty_polls;
+ unsigned long prev_fill_fail_polls;
+ unsigned long prev_copy_tx_sendtos;
+ unsigned long prev_tx_wakeup_sendtos;
+ unsigned long prev_opt_polls;
+};
+
struct xsk_umem_info {
struct xsk_ring_prod fq;
struct xsk_ring_cons cq;
@@ -123,6 +137,7 @@ struct xsk_socket_info {
struct xsk_umem_info *umem;
struct xsk_socket *xsk;
struct xsk_ring_stats ring_stats;
+ struct xsk_app_stats app_stats;
u32 outstanding_tx;
};
@@ -189,6 +204,45 @@ static int xsk_get_xdp_stats(int fd, struct xsk_socket_info *xsk)
return -EINVAL;
}
+static void dump_app_stats(long dt)
+{
+ int i;
+
+ for (i = 0; i < num_socks && xsks[i]; i++) {
+ char *fmt = "%-18s %'-14.0f %'-14lu\n";
+ double rx_empty_polls_ps, fill_fail_polls_ps, copy_tx_sendtos_ps,
+ tx_wakeup_sendtos_ps, opt_polls_ps;
+
+ rx_empty_polls_ps = (xsks[i]->app_stats.rx_empty_polls -
+ xsks[i]->app_stats.prev_rx_empty_polls) * 1000000000. / dt;
+ fill_fail_polls_ps = (xsks[i]->app_stats.fill_fail_polls -
+ xsks[i]->app_stats.prev_fill_fail_polls) * 1000000000. / dt;
+ copy_tx_sendtos_ps = (xsks[i]->app_stats.copy_tx_sendtos -
+ xsks[i]->app_stats.prev_copy_tx_sendtos) * 1000000000. / dt;
+ tx_wakeup_sendtos_ps = (xsks[i]->app_stats.tx_wakeup_sendtos -
+ xsks[i]->app_stats.prev_tx_wakeup_sendtos)
+ * 1000000000. / dt;
+ opt_polls_ps = (xsks[i]->app_stats.opt_polls -
+ xsks[i]->app_stats.prev_opt_polls) * 1000000000. / dt;
+
+ printf("\n%-18s %-14s %-14s\n", "", "calls/s", "count");
+ printf(fmt, "rx empty polls", rx_empty_polls_ps, xsks[i]->app_stats.rx_empty_polls);
+ printf(fmt, "fill fail polls", fill_fail_polls_ps,
+ xsks[i]->app_stats.fill_fail_polls);
+ printf(fmt, "copy tx sendtos", copy_tx_sendtos_ps,
+ xsks[i]->app_stats.copy_tx_sendtos);
+ printf(fmt, "tx wakeup sendtos", tx_wakeup_sendtos_ps,
+ xsks[i]->app_stats.tx_wakeup_sendtos);
+ printf(fmt, "opt polls", opt_polls_ps, xsks[i]->app_stats.opt_polls);
+
+ xsks[i]->app_stats.prev_rx_empty_polls = xsks[i]->app_stats.rx_empty_polls;
+ xsks[i]->app_stats.prev_fill_fail_polls = xsks[i]->app_stats.fill_fail_polls;
+ xsks[i]->app_stats.prev_copy_tx_sendtos = xsks[i]->app_stats.copy_tx_sendtos;
+ xsks[i]->app_stats.prev_tx_wakeup_sendtos = xsks[i]->app_stats.tx_wakeup_sendtos;
+ xsks[i]->app_stats.prev_opt_polls = xsks[i]->app_stats.opt_polls;
+ }
+}
+
static void dump_stats(void)
{
unsigned long now = get_nsecs();
@@ -198,7 +252,7 @@ static void dump_stats(void)
prev_time = now;
for (i = 0; i < num_socks && xsks[i]; i++) {
- char *fmt = "%-15s %'-11.0f %'-11lu\n";
+ char *fmt = "%-18s %'-14.0f %'-14lu\n";
double rx_pps, tx_pps, dropped_pps, rx_invalid_pps, full_pps, fill_empty_pps,
tx_invalid_pps, tx_empty_pps;
@@ -211,7 +265,7 @@ static void dump_stats(void)
print_benchmark(false);
printf("\n");
- printf("%-15s %-11s %-11s %-11.2f\n", "", "pps", "pkts",
+ printf("%-18s %-14s %-14s %-14.2f\n", "", "pps", "pkts",
dt / 1000000000.);
printf(fmt, "rx", rx_pps, xsks[i]->ring_stats.rx_npkts);
printf(fmt, "tx", tx_pps, xsks[i]->ring_stats.tx_npkts);
@@ -270,6 +324,9 @@ static void dump_stats(void)
}
}
}
+
+ if (opt_app_stats)
+ dump_app_stats(dt);
}
static bool is_benchmark_done(void)
@@ -708,6 +765,17 @@ static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem,
if (ret)
exit_with_error(-ret);
+ xsk->app_stats.rx_empty_polls = 0;
+ xsk->app_stats.fill_fail_polls = 0;
+ xsk->app_stats.copy_tx_sendtos = 0;
+ xsk->app_stats.tx_wakeup_sendtos = 0;
+ xsk->app_stats.opt_polls = 0;
+ xsk->app_stats.prev_rx_empty_polls = 0;
+ xsk->app_stats.prev_fill_fail_polls = 0;
+ xsk->app_stats.prev_copy_tx_sendtos = 0;
+ xsk->app_stats.prev_tx_wakeup_sendtos = 0;
+ xsk->app_stats.prev_opt_polls = 0;
+
return xsk;
}
@@ -735,6 +803,7 @@ static struct option long_options[] = {
{"tx-pkt-pattern", required_argument, 0, 'P'},
{"extra-stats", no_argument, 0, 'x'},
{"quiet", no_argument, 0, 'Q'},
+ {"app-stats", no_argument, 0, 'a'},
{0, 0, 0, 0}
};
@@ -771,6 +840,7 @@ static void usage(const char *prog)
" -P, --tx-pkt-pattern=nPacket fill pattern. Default: 0x%x\n"
" -x, --extra-stats Display extra statistics.\n"
" -Q, --quiet Do not display any stats.\n"
+ " -a, --app-stats Display application (syscall) statistics.\n"
"\n";
fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE,
opt_batch_size, MIN_PKT_SIZE, MIN_PKT_SIZE,
@@ -786,7 +856,7 @@ static void parse_command_line(int argc, char **argv)
opterr = 0;
for (;;) {
- c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQ",
+ c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:xQa",
long_options, &option_index);
if (c == -1)
break;
@@ -873,6 +943,9 @@ static void parse_command_line(int argc, char **argv)
case 'Q':
opt_quiet = 1;
break;
+ case 'a':
+ opt_app_stats = 1;
+ break;
default:
usage(basename(argv[0]));
}
@@ -923,8 +996,10 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
* is driven by the NAPI loop. So as an optimization, we do not have to call
* sendto() all the time in zero-copy mode for l2fwd.
*/
- if (opt_xdp_bind_flags & XDP_COPY)
+ if (opt_xdp_bind_flags & XDP_COPY) {
+ xsk->app_stats.copy_tx_sendtos++;
kick_tx(xsk);
+ }
ndescs = (xsk->outstanding_tx > opt_batch_size) ? opt_batch_size :
xsk->outstanding_tx;
@@ -939,8 +1014,10 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
while (ret != rcvd) {
if (ret < 0)
exit_with_error(-ret);
- if (xsk_ring_prod__needs_wakeup(&umem->fq))
+ if (xsk_ring_prod__needs_wakeup(&umem->fq)) {
+ xsk->app_stats.fill_fail_polls++;
ret = poll(fds, num_socks, opt_timeout);
+ }
ret = xsk_ring_prod__reserve(&umem->fq, rcvd, &idx_fq);
}
@@ -964,8 +1041,10 @@ static inline void complete_tx_only(struct xsk_socket_info *xsk,
if (!xsk->outstanding_tx)
return;
- if (!opt_need_wakeup || xsk_ring_prod__needs_wakeup(&xsk->tx))
+ if (!opt_need_wakeup || xsk_ring_prod__needs_wakeup(&xsk->tx)) {
+ xsk->app_stats.tx_wakeup_sendtos++;
kick_tx(xsk);
+ }
rcvd = xsk_ring_cons__peek(&xsk->umem->cq, batch_size, &idx);
if (rcvd > 0) {
@@ -983,8 +1062,10 @@ static void rx_drop(struct xsk_socket_info *xsk, struct pollfd *fds)
rcvd = xsk_ring_cons__peek(&xsk->rx, opt_batch_size, &idx_rx);
if (!rcvd) {
- if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq))
+ if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
+ xsk->app_stats.rx_empty_polls++;
ret = poll(fds, num_socks, opt_timeout);
+ }
return;
}
@@ -992,8 +1073,10 @@ static void rx_drop(struct xsk_socket_info *xsk, struct pollfd *fds)
while (ret != rcvd) {
if (ret < 0)
exit_with_error(-ret);
- if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq))
+ if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
+ xsk->app_stats.fill_fail_polls++;
ret = poll(fds, num_socks, opt_timeout);
+ }
ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
}
@@ -1026,6 +1109,8 @@ static void rx_drop_all(void)
for (;;) {
if (opt_poll) {
+ for (i = 0; i < num_socks; i++)
+ xsks[i]->app_stats.opt_polls++;
ret = poll(fds, num_socks, opt_timeout);
if (ret <= 0)
continue;
@@ -1106,6 +1191,8 @@ static void tx_only_all(void)
int batch_size = get_batch_size(pkt_cnt);
if (opt_poll) {
+ for (i = 0; i < num_socks; i++)
+ xsks[i]->app_stats.opt_polls++;
ret = poll(fds, num_socks, opt_timeout);
if (ret <= 0)
continue;
@@ -1137,8 +1224,10 @@ static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
rcvd = xsk_ring_cons__peek(&xsk->rx, opt_batch_size, &idx_rx);
if (!rcvd) {
- if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq))
+ if (xsk_ring_prod__needs_wakeup(&xsk->umem->fq)) {
+ xsk->app_stats.rx_empty_polls++;
ret = poll(fds, num_socks, opt_timeout);
+ }
return;
}
@@ -1147,8 +1236,10 @@ static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
if (ret < 0)
exit_with_error(-ret);
complete_tx_l2fwd(xsk, fds);
- if (xsk_ring_prod__needs_wakeup(&xsk->tx))
+ if (xsk_ring_prod__needs_wakeup(&xsk->tx)) {
+ xsk->app_stats.tx_wakeup_sendtos++;
kick_tx(xsk);
+ }
ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
}
@@ -1186,6 +1277,8 @@ static void l2fwd_all(void)
for (;;) {
if (opt_poll) {
+ for (i = 0; i < num_socks; i++)
+ xsks[i]->app_stats.opt_polls++;
ret = poll(fds, num_socks, opt_timeout);
if (ret <= 0)
continue;
--
2.17.1
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