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samples/bpf: xdpsock: Add clockid selection support 

User specifies the clock selection by using -w CLOCK or --clock=CLOCK
where CLOCK=[REALTIME, TAI, BOOTTIME, MONOTONIC].

The default CLOCK selection is MONOTONIC.

The implementation of clock selection parsing is borrowed from
iproute2/tc/q_taprio.c

Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211230035447.523177-4-boon.leong.ong@intel.com
This commit is contained in:
Ong Boon Leong 2021-12-30 11:54:43 +08:00 committed by Alexei Starovoitov
parent 6440a6c23f
commit 5a3882542a
1 changed files with 38 additions and 2 deletions
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40
samples/bpf/xdpsock_user.c
View File

@ -114,6 +114,7 @@ static u32 opt_num_xsks = 1;
static u32 prog_id;
static bool opt_busy_poll;
static bool opt_reduced_cap;
static clockid_t opt_clock = CLOCK_MONOTONIC;
struct vlan_ethhdr {
unsigned char h_dest[6];
@ -178,15 +179,40 @@ struct xsk_socket_info {
u32 outstanding_tx;
};
static const struct clockid_map {
const char *name;
clockid_t clockid;
} clockids_map[] = {
{ "REALTIME", CLOCK_REALTIME },
{ "TAI", CLOCK_TAI },
{ "BOOTTIME", CLOCK_BOOTTIME },
{ "MONOTONIC", CLOCK_MONOTONIC },
{ NULL }
};
static int num_socks;
struct xsk_socket_info *xsks[MAX_SOCKS];
int sock;
static int get_clockid(clockid_t *id, const char *name)
{
const struct clockid_map *clk;
for (clk = clockids_map; clk->name; clk++) {
if (strcasecmp(clk->name, name) == 0) {
*id = clk->clockid;
return 0;
}
}
return -1;
}
static unsigned long get_nsecs(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
clock_gettime(opt_clock, &ts);
return ts.tv_sec * 1000000000UL + ts.tv_nsec;
}
@ -965,6 +991,7 @@ static struct option long_options[] = {
{"shared-umem", no_argument, 0, 'M'},
{"force", no_argument, 0, 'F'},
{"duration", required_argument, 0, 'd'},
{"clock", required_argument, 0, 'w'},
{"batch-size", required_argument, 0, 'b'},
{"tx-pkt-count", required_argument, 0, 'C'},
{"tx-pkt-size", required_argument, 0, 's'},
@ -1006,6 +1033,7 @@ static void usage(const char *prog)
" -F, --force Force loading the XDP prog\n"
" -d, --duration=n Duration in secs to run command.\n"
" Default: forever.\n"
" -w, --clock=CLOCK Clock NAME (default MONOTONIC).\n"
" -b, --batch-size=n Batch size for sending or receiving\n"
" packets. Default: %d\n"
" -C, --tx-pkt-count=n Number of packets to send.\n"
@ -1041,7 +1069,7 @@ 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:VJ:K:G:H:xQaI:BR",
c = getopt_long(argc, argv, "Frtli:q:pSNn:w:czf:muMd:b:C:s:P:VJ:K:G:H:xQaI:BR",
long_options, &option_index);
if (c == -1)
break;
@ -1075,6 +1103,14 @@ static void parse_command_line(int argc, char **argv)
case 'n':
opt_interval = atoi(optarg);
break;
case 'w':
if (get_clockid(&opt_clock, optarg)) {
fprintf(stderr,
"ERROR: Invalid clock %s. Default to CLOCK_MONOTONIC.\n",
optarg);
opt_clock = CLOCK_MONOTONIC;
}
break;
case 'z':
opt_xdp_bind_flags |= XDP_ZEROCOPY;
break;