netdev - Re: [PATCH iproute2-next 2/3] tc: add mpls actions

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Date:   Tue, 9 Jul 2019 14:39:43 -0600
From:   David Ahern <dsahern@...il.com>
To:     John Hurley <john.hurley@...ronome.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, xiyou.wangcong@...il.com,
        willemdebruijn.kernel@...il.com, simon.horman@...ronome.com,
        jakub.kicinski@...ronome.com, oss-drivers@...ronome.com
Subject: Re: [PATCH iproute2-next 2/3] tc: add mpls actions


On 7/9/19 9:59 AM, John Hurley wrote:
> +static void explain(void)
> +{
> +	fprintf(stderr,
> +		"Usage: mpls pop [ protocol MPLS_PROTO ]\n"
> +		"       mpls push [ protocol MPLS_PROTO ] [ label MPLS_LABEL ] [ tc MPLS_TC ] [ ttl MPLS_TTL ] [ bos MPLS_BOS ] [CONTROL]\n"

that makes for a very long line to the user. Break at the ttl option and
make a newline:

mpls push [ protocol MPLS_PROTO ] [ label MPLS_LABEL ] [ tc MPLS_TC ]
          [ ttl MPLS_TTL ] [ bos MPLS_BOS ] [CONTROL]


> +		"       mpls modify [ label MPLS_LABEL ] [ tc MPLS_TC ] [ ttl MPLS_TTL ] [CONTROL]\n"
> +		"	for pop MPLS_PROTO is next header of packet - e.g. ip or mpls_uc\n"
> +		"       for push MPLS_PROTO is one of mpls_uc or mpls_mc\n"
> +		"            with default: mpls_uc\n"
> +		"       CONTROL := reclassify | pipe | drop | continue | pass |\n"
> +		"                  goto chain <CHAIN_INDEX>\n");
> +}
> +


...

> +static int print_mpls(struct action_util *au, FILE *f, struct rtattr *arg)
> +{
> +	struct rtattr *tb[TCA_MPLS_MAX + 1];
> +	struct tc_mpls *parm;
> +	SPRINT_BUF(b1);
> +	__u32 val;
> +
> +	if (!arg)
> +		return -1;
> +
> +	parse_rtattr_nested(tb, TCA_MPLS_MAX, arg);
> +
> +	if (!tb[TCA_MPLS_PARMS]) {
> +		print_string(PRINT_FP, NULL, "%s", "[NULL mpls parameters]");
> +		return -1;
> +	}
> +	parm = RTA_DATA(tb[TCA_MPLS_PARMS]);
> +
> +	print_string(PRINT_ANY, "kind", "%s ", "mpls");
> +	print_string(PRINT_ANY, "mpls_action", " %s",
> +		     action_names[parm->m_action]);
> +
> +	switch (parm->m_action) {
> +	case TCA_MPLS_ACT_POP:
> +		if (tb[TCA_MPLS_PROTO]) {
> +			__u16 proto;
> +
> +			proto = rta_getattr_u16(tb[TCA_MPLS_PROTO]);
> +			print_string(PRINT_ANY, "protocol", " protocol %s",
> +				     ll_proto_n2a(proto, b1, sizeof(b1)));
> +		}
> +		break;
> +	case TCA_MPLS_ACT_PUSH:
> +		if (tb[TCA_MPLS_PROTO]) {
> +			__u16 proto;
> +
> +			proto = rta_getattr_u16(tb[TCA_MPLS_PROTO]);
> +			print_string(PRINT_ANY, "protocol", " protocol %s",
> +				     ll_proto_n2a(proto, b1, sizeof(b1)));
> +		}
> +		/* Fallthrough */
> +	case TCA_MPLS_ACT_MODIFY:
> +		if (tb[TCA_MPLS_LABEL]) {
> +			val = rta_getattr_u32(tb[TCA_MPLS_LABEL]);
> +			print_uint(PRINT_ANY, "label", " label %u", val);
> +		}
> +		if (tb[TCA_MPLS_TC]) {
> +			val = rta_getattr_u8(tb[TCA_MPLS_TC]);
> +			print_uint(PRINT_ANY, "tc", " tc %u", val);
> +		}
> +		if (tb[TCA_MPLS_BOS]) {
> +			val = rta_getattr_u8(tb[TCA_MPLS_BOS]);
> +			print_uint(PRINT_ANY, "bos", " bos %u", val);
> +		}
> +		if (tb[TCA_MPLS_TTL]) {
> +			val = rta_getattr_u8(tb[TCA_MPLS_TTL]);
> +			print_uint(PRINT_ANY, "ttl", " ttl %u", val);
> +		}
> +		break;
> +	}
> +	print_action_control(f, " ", parm->action, "");
> +
> +	print_uint(PRINT_ANY, "index", "\n\t index %u", parm->index);
> +	print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt);
> +	print_int(PRINT_ANY, "bind", " bind %d", parm->bindcnt);
> +
> +	if (show_stats) {
> +		if (tb[TCA_MPLS_TM]) {
> +			struct tcf_t *tm = RTA_DATA(tb[TCA_MPLS_TM]);
> +
> +			print_tm(f, tm);
> +		}
> +	}
> +
> +	print_string(PRINT_FP, NULL, "%s", "\n");

s/"\n"/_SL_/ ?