Testing this on mlx5 and I'm not getting the RX-timestamp.
See command details below.
On 19/01/2023 23.15, Stanislav Fomichev wrote:
To be used for verification of driver implementations. Note that
the skb path is gone from the series, but I'm still keeping the
implementation for any possible future work.
$ xdp_hw_metadata <ifname>
sudo ./xdp_hw_metadata mlx5p1
Output:
[...cut ...]
open bpf program...
load bpf program...
prepare skb endpoint...
XXX timestamping_enable(): setsockopt(SO_TIMESTAMPING) ret:0
prepare xsk map...
map[0] = 3
map[1] = 4
map[2] = 5
map[3] = 6
map[4] = 7
map[5] = 8
attach bpf program...
poll: 0 (0)
poll: 0 (0)
poll: 0 (0)
poll: 1 (0)
xsk_ring_cons__peek: 1
0x1821788: rx_desc[0]->addr=100000000008000 addr=8100 comp_addr=8000
rx_timestamp: 0
rx_hash: 2773355807
0x1821788: complete idx=8 addr=8000
poll: 0 (0)
The trace_pipe:
$ sudo cat /sys/kernel/debug/tracing/trace_pipe
<idle>-0 [005] ..s2. 2722.884762: bpf_trace_printk:
forwarding UDP:9091 to AF_XDP
<idle>-0 [005] ..s2. 2722.884771: bpf_trace_printk:
populated rx_hash with 2773355807
On the other machine:
$ echo -n xdp | nc -u -q1 <target> 9091 # for AF_XDP
Fixing the source-port to see if RX-hash remains the same.
$ echo xdp | nc --source-port=2000 --udp 198.18.1.1 9091
$ echo -n skb | nc -u -q1 <target> 9092 # for skb
Sample output:
# xdp
xsk_ring_cons__peek: 1
0x19f9090: rx_desc[0]->addr=100000000008000 addr=8100 comp_addr=8000
rx_timestamp_supported: 1
rx_timestamp: 1667850075063948829
0x19f9090: complete idx=8 addr=8000
xsk_ring_cons__peek: 1
0x1821788: rx_desc[0]->addr=100000000008000 addr=8100 comp_addr=8000
rx_timestamp: 0
rx_hash: 2773355807
0x1821788: complete idx=8 addr=8000
It doesn't look like hardware RX-timestamps are getting enabled.
[... cut to relevant code ...]
diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
new file mode 100644
index 000000000000..0008f0f239e8
--- /dev/null
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -0,0 +1,403 @@
[...]
+static void timestamping_enable(int fd, int val)
+{
+ int ret;
+
+ ret = setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING, &val, sizeof(val));
+ if (ret < 0)
+ error(-1, errno, "setsockopt(SO_TIMESTAMPING)");
+}
+
+int main(int argc, char *argv[])
+{
[...]
+ printf("prepare skb endpoint...\n");
+ server_fd = start_server(AF_INET6, SOCK_DGRAM, NULL, 9092, 1000);
+ if (server_fd < 0)
+ error(-1, errno, "start_server");
+ timestamping_enable(server_fd,
+ SOF_TIMESTAMPING_SOFTWARE |
+ SOF_TIMESTAMPING_RAW_HARDWARE);
+
I don't think this timestamping_enable() with these flags are enough to
enable hardware timestamping.
--Jesper
