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Date: Thu, 2 Nov 2023 15:58:36 -0700
From: Stanislav Fomichev <sdf@...gle.com>
To: bpf@...r.kernel.org
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
martin.lau@...ux.dev, song@...nel.org, yhs@...com, john.fastabend@...il.com,
kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
kuba@...nel.org, toke@...nel.org, willemb@...gle.com, dsahern@...nel.org,
magnus.karlsson@...el.com, bjorn@...nel.org, maciej.fijalkowski@...el.com,
hawk@...nel.org, yoong.siang.song@...el.com, netdev@...r.kernel.org,
xdp-hints@...-project.net
Subject: [PATCH bpf-next v5 12/13] selftests/bpf: Convert xdp_hw_metadata to XDP_USE_NEED_WAKEUP
This is the recommended way to run AF_XDP, so let's use it in the test.
Also, some unrelated changes to now blow up the log too much:
- change default mode to zerocopy and add -c to use copy mode
- small fixes for the flags/sizes/prints
- add print_tstamp_delta to print timestamp + reference
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
tools/testing/selftests/bpf/xdp_hw_metadata.c | 73 +++++++++++++------
1 file changed, 49 insertions(+), 24 deletions(-)
diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
index 17c0f92ff160..057f7c145f62 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -32,7 +32,7 @@
#include "xdp_metadata.h"
-#define UMEM_NUM 16
+#define UMEM_NUM 256
#define UMEM_FRAME_SIZE XSK_UMEM__DEFAULT_FRAME_SIZE
#define UMEM_SIZE (UMEM_FRAME_SIZE * UMEM_NUM)
#define XDP_FLAGS (XDP_FLAGS_DRV_MODE | XDP_FLAGS_REPLACE)
@@ -48,7 +48,7 @@ struct xsk {
};
struct xdp_hw_metadata *bpf_obj;
-__u16 bind_flags = XDP_COPY;
+__u16 bind_flags = XDP_USE_NEED_WAKEUP | XDP_ZEROCOPY;
struct xsk *rx_xsk;
const char *ifname;
int ifindex;
@@ -68,7 +68,7 @@ static int open_xsk(int ifindex, struct xsk *xsk, __u32 queue_id)
.fill_size = XSK_RING_PROD__DEFAULT_NUM_DESCS,
.comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS,
.frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE,
- .flags = XDP_UMEM_UNALIGNED_CHUNK_FLAG,
+ .flags = XSK_UMEM__DEFAULT_FLAGS,
};
__u32 idx;
u64 addr;
@@ -110,7 +110,7 @@ static int open_xsk(int ifindex, struct xsk *xsk, __u32 queue_id)
for (i = 0; i < UMEM_NUM / 2; i++) {
addr = (UMEM_NUM / 2 + i) * UMEM_FRAME_SIZE;
printf("%p: rx_desc[%d] -> %lx\n", xsk, i, addr);
- *xsk_ring_prod__fill_addr(&xsk->fill, i) = addr;
+ *xsk_ring_prod__fill_addr(&xsk->fill, idx + i) = addr;
}
xsk_ring_prod__submit(&xsk->fill, ret);
@@ -131,12 +131,22 @@ static void refill_rx(struct xsk *xsk, __u64 addr)
__u32 idx;
if (xsk_ring_prod__reserve(&xsk->fill, 1, &idx) == 1) {
- printf("%p: complete idx=%u addr=%llx\n", xsk, idx, addr);
+ printf("%p: complete rx idx=%u addr=%llx\n", xsk, idx, addr);
*xsk_ring_prod__fill_addr(&xsk->fill, idx) = addr;
xsk_ring_prod__submit(&xsk->fill, 1);
}
}
+static int kick_tx(struct xsk *xsk)
+{
+ return sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
+}
+
+static int kick_rx(struct xsk *xsk)
+{
+ return recvfrom(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, NULL);
+}
+
#define NANOSEC_PER_SEC 1000000000 /* 10^9 */
static __u64 gettime(clockid_t clock_id)
{
@@ -152,6 +162,17 @@ static __u64 gettime(clockid_t clock_id)
return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
}
+static void print_tstamp_delta(const char *name, const char *refname,
+ __u64 tstamp, __u64 reference)
+{
+ __s64 delta = (__s64)reference - (__s64)tstamp;
+
+ printf("%s: %llu (sec:%0.4f) delta to %s sec:%0.4f (%0.3f usec)\n",
+ name, tstamp, (double)tstamp / NANOSEC_PER_SEC, refname,
+ (double)delta / NANOSEC_PER_SEC,
+ (double)delta / 1000);
+}
+
static void verify_xdp_metadata(void *data, clockid_t clock_id)
{
struct xdp_meta *meta;
@@ -167,22 +188,13 @@ static void verify_xdp_metadata(void *data, clockid_t clock_id)
printf("rx_timestamp: %llu (sec:%0.4f)\n", meta->rx_timestamp,
(double)meta->rx_timestamp / NANOSEC_PER_SEC);
if (meta->rx_timestamp) {
- __u64 usr_clock = gettime(clock_id);
- __u64 xdp_clock = meta->xdp_timestamp;
- __s64 delta_X = xdp_clock - meta->rx_timestamp;
- __s64 delta_X2U = usr_clock - xdp_clock;
-
- printf("XDP RX-time: %llu (sec:%0.4f) delta sec:%0.4f (%0.3f usec)\n",
- xdp_clock, (double)xdp_clock / NANOSEC_PER_SEC,
- (double)delta_X / NANOSEC_PER_SEC,
- (double)delta_X / 1000);
-
- printf("AF_XDP time: %llu (sec:%0.4f) delta sec:%0.4f (%0.3f usec)\n",
- usr_clock, (double)usr_clock / NANOSEC_PER_SEC,
- (double)delta_X2U / NANOSEC_PER_SEC,
- (double)delta_X2U / 1000);
- }
+ __u64 ref_tstamp = gettime(clock_id);
+ print_tstamp_delta("HW RX-time", "User RX-time",
+ meta->rx_timestamp, ref_tstamp);
+ print_tstamp_delta("XDP RX-time", "User RX-time",
+ meta->xdp_timestamp, ref_tstamp);
+ }
}
static void verify_skb_metadata(int fd)
@@ -252,6 +264,13 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd, clockid_t
while (true) {
errno = 0;
+
+ for (i = 0; i < rxq; i++) {
+ ret = kick_rx(&rx_xsk[i]);
+ if (ret)
+ printf("kick_rx ret=%d\n", ret);
+ }
+
ret = poll(fds, rxq + 1, 1000);
printf("poll: %d (%d) skip=%llu fail=%llu redir=%llu\n",
ret, errno, bpf_obj->bss->pkts_skip,
@@ -420,8 +439,9 @@ static void print_usage(void)
{
const char *usage =
"Usage: xdp_hw_metadata [OPTIONS] [IFNAME]\n"
- " -m Enable multi-buffer XDP for larger MTU\n"
+ " -c Run in copy mode (zerocopy is default)\n"
" -h Display this help and exit\n\n"
+ " -m Enable multi-buffer XDP for larger MTU\n"
"Generate test packets on the other machine with:\n"
" echo -n xdp | nc -u -q1 <dst_ip> 9091\n";
@@ -432,14 +452,19 @@ static void read_args(int argc, char *argv[])
{
char opt;
- while ((opt = getopt(argc, argv, "mh")) != -1) {
+ while ((opt = getopt(argc, argv, "chm")) != -1) {
switch (opt) {
- case 'm':
- bind_flags |= XDP_USE_SG;
+ case 'c':
+ bind_flags &= ~XDP_USE_NEED_WAKEUP;
+ bind_flags &= ~XDP_ZEROCOPY;
+ bind_flags |= XDP_COPY;
break;
case 'h':
print_usage();
exit(0);
+ case 'm':
+ bind_flags |= XDP_USE_SG;
+ break;
case '?':
if (isprint(optopt))
fprintf(stderr, "Unknown option: -%c\n", optopt);
--
2.42.0.869.gea05f2083d-goog
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