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tc: mqprio: reject queues count/offset pair count higher than num_tc 

Provide a sanity check that will make sure whether queues count/offset
pair count will not exceed the actual number of TCs being created.

Example command that is invalid because there are 4 count/offset pairs
whereas num_tc is only 2.

 # tc qdisc add dev enp96s0f0 root mqprio num_tc 2 map 0 0 0 0 1 1 1 1
queues 4@0 4@4 4@8 4@12 hw 1 mode channel

Store the parsed count/offset pair count onto a dedicated variable that
will be compared against opt.num_tc after all of the command line
arguments were parsed. Bail out if this count is higher than opt.num_tc
and let user know about it.

Drivers were swallowing such commands as they were iterating over
count/offset pairs where num_tc was used as a delimiter, so this is not
a big deal, but better catch such misconfiguration at the command line
argument parsing level.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Maciej Fijalkowski 2020-05-13 21:47:17 +02:00 committed by David Ahern
parent 7bd9188581
commit 42796dcd36
1 changed files with 8 additions and 0 deletions
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8
tc/q_mqprio.c
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@ -48,6 +48,7 @@ static int mqprio_parse_opt(struct qdisc_util *qu, int argc,
__u64 max_rate64[TC_QOPT_MAX_QUEUE] = {0};
__u16 shaper = TC_MQPRIO_SHAPER_DCB;
__u16 mode = TC_MQPRIO_MODE_DCB;
int cnt_off_pairs = 0;
struct rtattr *tail;
__u32 flags = 0;
@ -94,6 +95,7 @@ static int mqprio_parse_opt(struct qdisc_util *qu, int argc,
}
free(tmp);
idx++;
cnt_off_pairs++;
}
} else if (strcmp(*argv, "hw") == 0) {
NEXT_ARG();
@ -173,6 +175,12 @@ static int mqprio_parse_opt(struct qdisc_util *qu, int argc,
argc--; argv++;
}
if (cnt_off_pairs > opt.num_tc) {
fprintf(stderr, "queues count/offset pair count %d can not be higher than given num_tc %d\n",
cnt_off_pairs, opt.num_tc);
return -1;
}
tail = NLMSG_TAIL(n);
addattr_l(n, 1024, TCA_OPTIONS, &opt, sizeof(opt));