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tc: implement support for action terse dump

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Implement support for action terse dump using new TCA_ACT_FLAG_TERSE_DUMP
value of TCA_ROOT_FLAGS tlv. Set the flag when user requested it with
following example CLI (-br for 'brief'):

$ tc -s -br actions ls action tunnel_key
total acts 2

        action order 0: tunnel_key       index 1
        Action statistics:
        Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
        backlog 0b 0p requeues 0

        action order 1: tunnel_key       index 2
        Action statistics:
        Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
        backlog 0b 0p requeues 0

In terse mode dump only outputs essential data needed to identify the
action (kind, index) and stats, if requested by the user.

Signed-off-by: Vlad Buslov <vlad@buslov.dev>
Suggested-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Vlad Buslov 2020-11-30 21:32:50 +02:00 committed by David Ahern
parent 00fffb2d79
commit ea130da81e
2 changed files with 10 additions and 1 deletions
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2
man/man8/tc.8
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@ -858,7 +858,7 @@ alias.
.BR "\-br" , " \-brief"
Print only essential data needed to identify the filter and action (handle,
cookie, etc.) and stats. This option is currently only supported by
.BR "tc filter show " command.
.BR "tc filter show " and " tc actions ls " commands.
.SH "EXAMPLES"
.PP

9
tc/m_action.c
View File

@ -374,6 +374,11 @@ static int tc_print_one_action(FILE *f, struct rtattr *arg)
if (err < 0)
return err;
if (brief && tb[TCA_ACT_INDEX]) {
print_uint(PRINT_ANY, "index", "\t index %u",
rta_getattr_u32(tb[TCA_ACT_INDEX]));
print_nl();
}
if (show_stats && tb[TCA_ACT_STATS]) {
print_string(PRINT_FP, NULL, "\tAction statistics:", NULL);
print_nl();
@ -737,6 +742,10 @@ static int tc_act_list_or_flush(int *argc_p, char ***argv_p, int event)
tail3 = NLMSG_TAIL(&req.n);
flag_select.value |= TCA_ACT_FLAG_LARGE_DUMP_ON;
flag_select.selector |= TCA_ACT_FLAG_LARGE_DUMP_ON;
if (brief) {
flag_select.value |= TCA_ACT_FLAG_TERSE_DUMP;
flag_select.selector |= TCA_ACT_FLAG_TERSE_DUMP;
}
addattr_l(&req.n, MAX_MSG, TCA_ROOT_FLAGS, &flag_select,
sizeof(struct nla_bitfield32));
tail3->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail3;