[PATCH iproute2-next 7/8] tc: gred: support controlling RED flags

[Jakub Kicinski]

Kernel GRED qdisc supports ECN marking, and the harddrop flag
but setting and dumping this flag is not possible with iproute2.
Add the support.

Signed-off-by: Jakub Kicinski <jakub.kicin...@netronome.com>
Reviewed-by: Quentin Monnet <quentin.mon...@netronome.com>
---
 bash-completion/tc | 2 +-
 tc/q_gred.c        | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/bash-completion/tc b/bash-completion/tc
index 29bca5d9354d..007e1c2e30bf 100644
--- a/bash-completion/tc
+++ b/bash-completion/tc
@@ -302,7 +302,7 @@ _tc_qdisc_options()
             ;;
         gred)
             _tc_once_attr 'setup vqs default grio vq prio limit min max avpkt \
-                burst probability bandwidth'
+                burst probability bandwidth ecn harddrop'
             return 0
             ;;
         hhf)
diff --git a/tc/q_gred.c b/tc/q_gred.c
index fda41a5704a9..dfa3252bc2a8 100644
--- a/tc/q_gred.c
+++ b/tc/q_gred.c
@@ -37,7 +37,7 @@
 static void explain(void)
 {
        fprintf(stderr, "Usage: tc qdisc { add | replace | change } ... gred 
setup vqs NUMBER\n");
-       fprintf(stderr, "           default DEFAULT_VQ [ grio ] [ limit BYTES 
]\n");
+       fprintf(stderr, "           default DEFAULT_VQ [ grio ] [ limit BYTES ] 
[ecn] [harddrop]\n");
        fprintf(stderr, "       tc qdisc change ... gred vq VQ [ prio VALUE ] 
limit BYTES\n");
        fprintf(stderr, "           min BYTES max BYTES avpkt BYTES [ burst 
PACKETS ]\n");
        fprintf(stderr, "           [ probability PROBABILITY ] [ bandwidth 
KBPS ]\n");
@@ -87,6 +87,10 @@ static int init_gred(struct qdisc_util *qu, int argc, char 
**argv,
                                fprintf(stderr, "Illegal \"limit\"\n");
                                return -1;
                        }
+               } else if (strcmp(*argv, "ecn") == 0) {
+                       opt.flags |= TC_RED_ECN;
+               } else if (strcmp(*argv, "harddrop") == 0) {
+                       opt.flags |= TC_RED_HARDDROP;
                } else if (strcmp(*argv, "help") == 0) {
                        explain();
                        return -1;
@@ -452,6 +456,8 @@ static int gred_print_opt(struct qdisc_util *qu, FILE *f, 
struct rtattr *opt)
                             sprint_size(*limit, b1));
        }
 
+       tc_red_print_flags(sopt->flags);
+
        open_json_array(PRINT_JSON, "vqs");
        for (i = 0; i < MAX_DPs; i++, qopt++) {
                if (qopt->DP >= MAX_DPs)
-- 
2.17.1