net: sch: red: Change offloaded xstats to be incremental

Change the value of the xstats requested from the driver for offloaded RED
to be incremental, like the normal stats.
It increases consistency - if a qdisc stops being offloaded its xstats
don't change.

Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Reviewed-by: Yuval Mintz <yuvalm@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
index 3e28418..55e4e4d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
@@ -212,6 +212,7 @@ mlxsw_sp_qdisc_get_red_xstats(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
 {
        struct red_stats *xstats_base = &mlxsw_sp_qdisc->xstats_base;
        struct mlxsw_sp_port_xstats *xstats;
+       int early_drops, marks, pdrops;
 
        if (mlxsw_sp_qdisc->handle != handle ||
            mlxsw_sp_qdisc->type != MLXSW_SP_QDISC_RED)
@@ -219,9 +220,17 @@ mlxsw_sp_qdisc_get_red_xstats(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle,
 
        xstats = &mlxsw_sp_port->periodic_hw_stats.xstats;
 
-       res->prob_drop = xstats->wred_drop[tclass_num] - xstats_base->prob_drop;
-       res->prob_mark = xstats->ecn - xstats_base->prob_mark;
-       res->pdrop = xstats->tail_drop[tclass_num] - xstats_base->pdrop;
+       early_drops = xstats->wred_drop[tclass_num] - xstats_base->prob_drop;
+       marks = xstats->ecn - xstats_base->prob_mark;
+       pdrops = xstats->tail_drop[tclass_num] - xstats_base->pdrop;
+
+       res->pdrop += pdrops;
+       res->prob_drop += early_drops;
+       res->prob_mark += marks;
+
+       xstats_base->pdrop += pdrops;
+       xstats_base->prob_drop += early_drops;
+       xstats_base->prob_mark += marks;
        return 0;
 }
 

diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index a392eaa..0af1c12 100644 (file)
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -344,32 +344,24 @@ static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
 {
        struct red_sched_data *q = qdisc_priv(sch);
        struct net_device *dev = qdisc_dev(sch);
-       struct tc_red_xstats st = {
-               .early  = q->stats.prob_drop + q->stats.forced_drop,
-               .pdrop  = q->stats.pdrop,
-               .other  = q->stats.other,
-               .marked = q->stats.prob_mark + q->stats.forced_mark,
-       };
+       struct tc_red_xstats st = {0};
 
        if (sch->flags & TCQ_F_OFFLOADED) {
-               struct red_stats hw_stats = {0};
                struct tc_red_qopt_offload hw_stats_request = {
                        .command = TC_RED_XSTATS,
                        .handle = sch->handle,
                        .parent = sch->parent,
                        {
-                               .xstats = &hw_stats,
+                               .xstats = &q->stats,
                        },
                };
-               if (!dev->netdev_ops->ndo_setup_tc(dev,
-                                                  TC_SETUP_QDISC_RED,
-                                                  &hw_stats_request)) {
-                       st.early += hw_stats.prob_drop + hw_stats.forced_drop;
-                       st.pdrop += hw_stats.pdrop;
-                       st.other += hw_stats.other;
-                       st.marked += hw_stats.prob_mark + hw_stats.forced_mark;
-               }
+               dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_RED,
+                                             &hw_stats_request);
        }
+       st.early = q->stats.prob_drop + q->stats.forced_drop;
+       st.pdrop = q->stats.pdrop;
+       st.other = q->stats.other;
+       st.marked = q->stats.prob_mark + q->stats.forced_mark;
 
        return gnet_stats_copy_app(d, &st, sizeof(st));
 }