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samples/bpf: xdpsock: Add option to specify transmit fill pattern

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The UDP payload fill pattern can be specified using '-P' or '--tx-pkt-pattern'
option. It is an unsigned 32 bit field and defaulted to 0x12345678.

The IP and UDP checksum is calculated by the code as per the content of
the packet before transmission.

Signed-off-by: Jay Jayatheerthan <jay.jayatheerthan@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191220085530.4980-7-jay.jayatheerthan@intel.com
This commit is contained in:
Jay Jayatheerthan 2019-12-20 14:25:30 +05:30 committed by Alexei Starovoitov
parent 4a3c23ae3a
commit 46e3268eaa
1 changed files with 9 additions and 4 deletions
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13
samples/bpf/xdpsock_user.c
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@ -76,7 +76,7 @@ static bool benchmark_done;
static u32 opt_batch_size = 64; static u32 opt_batch_size = 64;
static int opt_pkt_count; static int opt_pkt_count;
static u16 opt_pkt_size = MIN_PKT_SIZE; static u16 opt_pkt_size = MIN_PKT_SIZE;
static u32 pkt_fill_pattern = 0x12345678; static u32 opt_pkt_fill_pattern = 0x12345678;
static int opt_poll; static int opt_poll;
static int opt_interval = 1; static int opt_interval = 1;
static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP; static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
@ -517,7 +517,7 @@ static void gen_eth_hdr_data(void)
udp_hdr->len = htons(UDP_PKT_SIZE); udp_hdr->len = htons(UDP_PKT_SIZE);
/* UDP data */ /* UDP data */
memset32_htonl(pkt_data + PKT_HDR_SIZE, pkt_fill_pattern, memset32_htonl(pkt_data + PKT_HDR_SIZE, opt_pkt_fill_pattern,
UDP_PKT_DATA_SIZE); UDP_PKT_DATA_SIZE);
/* UDP header checksum */ /* UDP header checksum */
@ -630,6 +630,7 @@ static struct option long_options[] = {
{"batch-size", required_argument, 0, 'b'}, {"batch-size", required_argument, 0, 'b'},
{"tx-pkt-count", required_argument, 0, 'C'}, {"tx-pkt-count", required_argument, 0, 'C'},
{"tx-pkt-size", required_argument, 0, 's'}, {"tx-pkt-size", required_argument, 0, 's'},
{"tx-pkt-pattern", required_argument, 0, 'P'},
{0, 0, 0, 0} {0, 0, 0, 0}
}; };
@ -663,10 +664,11 @@ static void usage(const char *prog)
" -s, --tx-pkt-size=n Transmit packet size.\n" " -s, --tx-pkt-size=n Transmit packet size.\n"
" (Default: %d bytes)\n" " (Default: %d bytes)\n"
" Min size: %d, Max size %d.\n" " Min size: %d, Max size %d.\n"
" -P, --tx-pkt-pattern=nPacket fill pattern. Default: 0x%x\n"
"\n"; "\n";
fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE, fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE,
opt_batch_size, MIN_PKT_SIZE, MIN_PKT_SIZE, opt_batch_size, MIN_PKT_SIZE, MIN_PKT_SIZE,
XSK_UMEM__DEFAULT_FRAME_SIZE); XSK_UMEM__DEFAULT_FRAME_SIZE, opt_pkt_fill_pattern);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
@ -678,7 +680,7 @@ static void parse_command_line(int argc, char **argv)
opterr = 0; opterr = 0;
for (;;) { for (;;) {
c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:", c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:s:P:",
long_options, &option_index); long_options, &option_index);
if (c == -1) if (c == -1)
break; break;
@ -756,6 +758,9 @@ static void parse_command_line(int argc, char **argv)
usage(basename(argv[0])); usage(basename(argv[0]));
} }
break; break;
case 'P':
opt_pkt_fill_pattern = strtol(optarg, NULL, 16);
break;
default: default:
usage(basename(argv[0])); usage(basename(argv[0]));
} }