taprio: Add support for setting flags

This allows a new parameter, flags, to be passed to taprio. Currently, it
only supports enabling the txtime-assist mode. But, we plan to add
different modes for taprio (e.g. hardware offloading) and this parameter
will be useful in enabling those modes.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Vedang Patel <vedang.patel@intel.com>
Signed-off-by: David Ahern <dsahern@gmail.com>

diff --git a/tc/q_taprio.c b/tc/q_taprio.c
index 62c8c591da994167c4d1b32f90b316818d69e151..1db2aba6efe71ed020b0882ed8c66e25b4ce1f6c 100644 (file)
--- a/tc/q_taprio.c
+++ b/tc/q_taprio.c
@@ -159,6 +159,7 @@ static int taprio_parse_opt(struct qdisc_util *qu, int argc,
        __s64 cycle_time_extension = 0;
        struct list_head sched_entries;
        struct rtattr *tail, *l;
+       __u32 taprio_flags = 0;
        __s64 cycle_time = 0;
        __s64 base_time = 0;
        int err, idx;
@@ -281,6 +282,17 @@ static int taprio_parse_opt(struct qdisc_util *qu, int argc,
                                explain_clockid(*argv);
                                return -1;
                        }
+               } else if (strcmp(*argv, "flags") == 0) {
+                       NEXT_ARG();
+                       if (taprio_flags) {
+                               fprintf(stderr, "taprio: duplicate \"flags\" specification\n");
+                               return -1;
+                       }
+                       if (get_u32(&taprio_flags, *argv, 0)) {
+                               PREV_ARG();
+                               return -1;
+                       }
+
                } else if (strcmp(*argv, "help") == 0) {
                        explain();
                        return -1;
@@ -297,6 +309,9 @@ static int taprio_parse_opt(struct qdisc_util *qu, int argc,
        if (clockid != CLOCKID_INVALID)
                addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_CLOCKID, &clockid, sizeof(clockid));
 
+       if (taprio_flags)
+               addattr_l(n, 1024, TCA_TAPRIO_ATTR_FLAGS, &taprio_flags, sizeof(taprio_flags));
+
        if (opt.num_tc > 0)
                addattr_l(n, 1024, TCA_TAPRIO_ATTR_PRIOMAP, &opt, sizeof(opt));
 
@@ -442,6 +457,13 @@ static int taprio_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
 
        print_string(PRINT_ANY, "clockid", "clockid %s", get_clock_name(clockid));
 
+       if (tb[TCA_TAPRIO_ATTR_FLAGS]) {
+               __u32 flags;
+
+               flags = rta_getattr_u32(tb[TCA_TAPRIO_ATTR_FLAGS]);
+               print_0xhex(PRINT_ANY, "flags", " flags %#x", flags);
+       }
+
        print_schedule(f, tb);
 
        if (tb[TCA_TAPRIO_ATTR_ADMIN_SCHED]) {