static void parse_command_line()

in bpf/xdpsock_user.c [1148:1341]

• 186 lines of code
• 55 McCabe index (conditional complexity)

static void parse_command_line(int argc, char **argv)
{
	int option_index, c;

	opterr = 0;

	for (;;) {
		c = getopt_long(argc, argv,
				"Frtli:q:pSNn:w:O:czf:muMd:b:C:s:P:VJ:K:G:H:T:yW:U:xQaI:BR",
				long_options, &option_index);
		if (c == -1)
			break;

		switch (c) {
		case 'r':
			opt_bench = BENCH_RXDROP;
			break;
		case 't':
			opt_bench = BENCH_TXONLY;
			break;
		case 'l':
			opt_bench = BENCH_L2FWD;
			break;
		case 'i':
			opt_if = optarg;
			break;
		case 'q':
			opt_queue = atoi(optarg);
			break;
		case 'p':
			opt_poll = 1;
			break;
		case 'S':
			opt_xdp_flags |= XDP_FLAGS_SKB_MODE;
			opt_xdp_bind_flags |= XDP_COPY;
			break;
		case 'N':
			/* default, set below */
			break;
		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 'O':
			opt_retries = atoi(optarg);
			break;
		case 'z':
			opt_xdp_bind_flags |= XDP_ZEROCOPY;
			break;
		case 'c':
			opt_xdp_bind_flags |= XDP_COPY;
			break;
		case 'u':
			opt_umem_flags |= XDP_UMEM_UNALIGNED_CHUNK_FLAG;
			opt_unaligned_chunks = 1;
			opt_mmap_flags = MAP_HUGETLB;
			break;
		case 'F':
			opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
			break;
		case 'f':
			opt_xsk_frame_size = atoi(optarg);
			break;
		case 'm':
			opt_need_wakeup = false;
			opt_xdp_bind_flags &= ~XDP_USE_NEED_WAKEUP;
			break;
		case 'M':
			opt_num_xsks = MAX_SOCKS;
			break;
		case 'd':
			opt_duration = atoi(optarg);
			opt_duration *= 1000000000;
			break;
		case 'b':
			opt_batch_size = atoi(optarg);
			break;
		case 'C':
			opt_pkt_count = atoi(optarg);
			break;
		case 's':
			opt_pkt_size = atoi(optarg);
			if (opt_pkt_size > (XSK_UMEM__DEFAULT_FRAME_SIZE) ||
			    opt_pkt_size < MIN_PKT_SIZE) {
				fprintf(stderr,
					"ERROR: Invalid frame size %d\n",
					opt_pkt_size);
				usage(basename(argv[0]));
			}
			break;
		case 'P':
			opt_pkt_fill_pattern = strtol(optarg, NULL, 16);
			break;
		case 'V':
			opt_vlan_tag = true;
			break;
		case 'J':
			opt_pkt_vlan_id = atoi(optarg);
			break;
		case 'K':
			opt_pkt_vlan_pri = atoi(optarg);
			break;
		case 'G':
			if (!ether_aton_r(optarg,
					  (struct ether_addr *)&opt_txdmac)) {
				fprintf(stderr, "Invalid dmac address:%s\n",
					optarg);
				usage(basename(argv[0]));
			}
			break;
		case 'H':
			if (!ether_aton_r(optarg,
					  (struct ether_addr *)&opt_txsmac)) {
				fprintf(stderr, "Invalid smac address:%s\n",
					optarg);
				usage(basename(argv[0]));
			}
			break;
		case 'T':
			opt_tx_cycle_ns = atoi(optarg);
			opt_tx_cycle_ns *= NSEC_PER_USEC;
			break;
		case 'y':
			opt_tstamp = 1;
			break;
		case 'W':
			if (get_schpolicy(&opt_schpolicy, optarg)) {
				fprintf(stderr,
					"ERROR: Invalid policy %s. Default to SCHED_OTHER.\n",
					optarg);
				opt_schpolicy = SCHED_OTHER;
			}
			break;
		case 'U':
			opt_schprio = atoi(optarg);
			break;
		case 'x':
			opt_extra_stats = 1;
			break;
		case 'Q':
			opt_quiet = 1;
			break;
		case 'a':
			opt_app_stats = 1;
			break;
		case 'I':
			opt_irq_str = optarg;
			if (get_interrupt_number())
				irqs_at_init = get_irqs();
			if (irqs_at_init < 0) {
				fprintf(stderr, "ERROR: Failed to get irqs for %s\n", opt_irq_str);
				usage(basename(argv[0]));
			}
			break;
		case 'B':
			opt_busy_poll = 1;
			break;
		case 'R':
			opt_reduced_cap = true;
			break;
		default:
			usage(basename(argv[0]));
		}
	}

	if (!(opt_xdp_flags & XDP_FLAGS_SKB_MODE))
		opt_xdp_flags |= XDP_FLAGS_DRV_MODE;

	opt_ifindex = if_nametoindex(opt_if);
	if (!opt_ifindex) {
		fprintf(stderr, "ERROR: interface \"%s\" does not exist\n",
			opt_if);
		usage(basename(argv[0]));
	}

	if ((opt_xsk_frame_size & (opt_xsk_frame_size - 1)) &&
	    !opt_unaligned_chunks) {
		fprintf(stderr, "--frame-size=%d is not a power of two\n",
			opt_xsk_frame_size);
		usage(basename(argv[0]));
	}

	if (opt_reduced_cap && opt_num_xsks > 1) {
		fprintf(stderr, "ERROR: -M and -R cannot be used together\n");
		usage(basename(argv[0]));
	}
}