Add Launch Time hw offload request to xdp_hw_metadata. User can configure
the delta of launch time to HW RX-time by using "-l" argument. The default
delta is 100,000,000 nanosecond.
Signed-off-by: Song Yoong Siang <yoong.siang.s...@intel.com>
---
tools/testing/selftests/bpf/xdp_hw_metadata.c | 30 +++++++++++++++++--
1 file changed, 27 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c
b/tools/testing/selftests/bpf/xdp_hw_metadata.c
index 6f7b15d6c6ed..795c1d14e02d 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -13,6 +13,7 @@
* - UDP 9091 packets trigger TX reply
* - TX HW timestamp is requested and reported back upon completion
* - TX checksum is requested
+ * - TX launch time HW offload is requested for transmission
*/
#include <test_progs.h>
@@ -64,6 +65,8 @@ int rxq;
bool skip_tx;
__u64 last_hw_rx_timestamp;
__u64 last_xdp_rx_timestamp;
+__u64 last_launch_time;
+__u64 launch_time_delta_to_hw_rx_timestamp = 100000000; /* 0.1 second */
void test__fail(void) { /* for network_helpers.c */ }
@@ -298,6 +301,8 @@ static bool complete_tx(struct xsk *xsk, clockid_t clock_id)
if (meta->completion.tx_timestamp) {
__u64 ref_tstamp = gettime(clock_id);
+ print_tstamp_delta("HW Launch-time", "HW TX-complete-time",
+ last_launch_time,
meta->completion.tx_timestamp);
print_tstamp_delta("HW TX-complete-time", "User
TX-complete-time",
meta->completion.tx_timestamp, ref_tstamp);
print_tstamp_delta("XDP RX-time", "User TX-complete-time",
@@ -395,6 +400,14 @@ static void ping_pong(struct xsk *xsk, void *rx_packet,
clockid_t clock_id)
xsk, ntohs(udph->check), ntohs(want_csum),
meta->request.csum_start, meta->request.csum_offset);
+ /* Set the value of launch time */
+ meta->flags |= XDP_TXMD_FLAGS_LAUNCH_TIME;
+ meta->request.launch_time = last_hw_rx_timestamp +
+ launch_time_delta_to_hw_rx_timestamp;
+ last_launch_time = meta->request.launch_time;
+ print_tstamp_delta("HW RX-time", "HW Launch-time", last_hw_rx_timestamp,
+ meta->request.launch_time);
+
memcpy(data, rx_packet, len); /* don't share umem chunk for simplicity
*/
tx_desc->options |= XDP_TX_METADATA;
tx_desc->len = len;
@@ -402,10 +415,14 @@ static void ping_pong(struct xsk *xsk, void *rx_packet,
clockid_t clock_id)
xsk_ring_prod__submit(&xsk->tx, 1);
}
+#define SLEEP_PER_ITERATION_IN_US 10
+#define SLEEP_PER_ITERATION_IN_NS (SLEEP_PER_ITERATION_IN_US * 1000)
+#define MAX_ITERATION(x) (((x) / SLEEP_PER_ITERATION_IN_NS) + 500)
static int verify_metadata(struct xsk *rx_xsk, int rxq, int server_fd,
clockid_t clock_id)
{
const struct xdp_desc *rx_desc;
struct pollfd fds[rxq + 1];
+ int max_iterations;
__u64 comp_addr;
__u64 addr;
__u32 idx = 0;
@@ -418,6 +435,9 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq, int
server_fd, clockid_t
fds[i].revents = 0;
}
+ /* Calculate max iterations to wait for transmit completion */
+ max_iterations = MAX_ITERATION(launch_time_delta_to_hw_rx_timestamp);
+
fds[rxq].fd = server_fd;
fds[rxq].events = POLLIN;
fds[rxq].revents = 0;
@@ -477,10 +497,10 @@ static int verify_metadata(struct xsk *rx_xsk, int rxq,
int server_fd, clockid_t
if (ret)
printf("kick_tx ret=%d\n", ret);
- for (int j = 0; j < 500; j++) {
+ for (int j = 0; j < max_iterations;
j++) {
if (complete_tx(xsk, clock_id))
break;
- usleep(10);
+
usleep(SLEEP_PER_ITERATION_IN_US);
}
}
}
@@ -608,6 +628,7 @@ static void print_usage(void)
" -h Display this help and exit\n\n"
" -m Enable multi-buffer XDP for larger MTU\n"
" -r Don't generate AF_XDP reply (rx metadata only)\n"
+ " -l Delta of launch time to HW RX-time in ns (default:
100,000,000ns)\n"
"Generate test packets on the other machine with:\n"
" echo -n xdp | nc -u -q1 <dst_ip> 9091\n";
@@ -618,7 +639,7 @@ static void read_args(int argc, char *argv[])
{
int opt;
- while ((opt = getopt(argc, argv, "chmr")) != -1) {
+ while ((opt = getopt(argc, argv, "chmrl:")) != -1) {
switch (opt) {
case 'c':
bind_flags &= ~XDP_USE_NEED_WAKEUP;
@@ -634,6 +655,9 @@ static void read_args(int argc, char *argv[])
case 'r':
skip_tx = true;
break;
+ case 'l':
+ launch_time_delta_to_hw_rx_timestamp = atoll(optarg);
+ break;
case '?':
if (isprint(optopt))
fprintf(stderr, "Unknown option: -%c\n",
optopt);
--
2.34.1
