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>
__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;
}
free(tmp);
idx++;
+ cnt_off_pairs++;
}
} else if (strcmp(*argv, "hw") == 0) {
NEXT_ARG();
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));