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mlxsw: spectrum_qdisc: Include MC TCs in Qdisc counters

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mlxsw configures Spectrum in such a way that BUM traffic is passed not
through its nominal traffic class TC, but through its MC counterpart TC+8.
However, when collecting statistics, Qdiscs only look at the nominal TC and
ignore the MC TC.

Add two helpers to compute the value for logical TC from the constituents,
one for backlog, the other for tail drops. Use them throughout instead of
going through the xstats pointer directly.

Counters for TX bytes and packets are deduced from packet priority
counters, and therefore already include BUM traffic. wred_drop counter is
irrelevant on MC TCs, because RED is not enabled on them.

Fixes: 7b81953066 ("mlxsw: spectrum: Configure MC-aware mode on mlxsw ports")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2020-01-15 13:53:49 +02:00 committed by David S. Miller
parent ca7609ff36
commit 85005b82e5
1 changed files with 23 additions and 7 deletions
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30
drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
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@ -195,6 +195,20 @@ mlxsw_sp_qdisc_get_xstats(struct mlxsw_sp_port *mlxsw_sp_port,
return -EOPNOTSUPP;
}
static u64
mlxsw_sp_xstats_backlog(struct mlxsw_sp_port_xstats *xstats, int tclass_num)
{
return xstats->backlog[tclass_num] +
xstats->backlog[tclass_num + 8];
}
static u64
mlxsw_sp_xstats_tail_drop(struct mlxsw_sp_port_xstats *xstats, int tclass_num)
{
return xstats->tail_drop[tclass_num] +
xstats->tail_drop[tclass_num + 8];
}
static void
mlxsw_sp_qdisc_bstats_per_priority_get(struct mlxsw_sp_port_xstats *xstats,
u8 prio_bitmap, u64 *tx_packets,
@ -269,7 +283,7 @@ mlxsw_sp_setup_tc_qdisc_red_clean_stats(struct mlxsw_sp_port *mlxsw_sp_port,
&stats_base->tx_bytes);
red_base->prob_mark = xstats->ecn;
red_base->prob_drop = xstats->wred_drop[tclass_num];
red_base->pdrop = xstats->tail_drop[tclass_num];
red_base->pdrop = mlxsw_sp_xstats_tail_drop(xstats, tclass_num);
stats_base->overlimits = red_base->prob_drop + red_base->prob_mark;
stats_base->drops = red_base->prob_drop + red_base->pdrop;
@ -370,7 +384,8 @@ mlxsw_sp_qdisc_get_red_xstats(struct mlxsw_sp_port *mlxsw_sp_port,
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;
pdrops = mlxsw_sp_xstats_tail_drop(xstats, tclass_num) -
xstats_base->pdrop;
res->pdrop += pdrops;
res->prob_drop += early_drops;
@ -403,9 +418,10 @@ mlxsw_sp_qdisc_get_red_stats(struct mlxsw_sp_port *mlxsw_sp_port,
overlimits = xstats->wred_drop[tclass_num] + xstats->ecn -
stats_base->overlimits;
drops = xstats->wred_drop[tclass_num] + xstats->tail_drop[tclass_num] -
drops = xstats->wred_drop[tclass_num] +
mlxsw_sp_xstats_tail_drop(xstats, tclass_num) -
stats_base->drops;
backlog = xstats->backlog[tclass_num];
backlog = mlxsw_sp_xstats_backlog(xstats, tclass_num);
_bstats_update(stats_ptr->bstats, tx_bytes, tx_packets);
stats_ptr->qstats->overlimits += overlimits;
@ -576,9 +592,9 @@ mlxsw_sp_qdisc_get_prio_stats(struct mlxsw_sp_port *mlxsw_sp_port,
tx_packets = stats->tx_packets - stats_base->tx_packets;
for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
drops += xstats->tail_drop[i];
drops += mlxsw_sp_xstats_tail_drop(xstats, i);
drops += xstats->wred_drop[i];
backlog += xstats->backlog[i];
backlog += mlxsw_sp_xstats_backlog(xstats, i);
}
drops = drops - stats_base->drops;
@ -614,7 +630,7 @@ mlxsw_sp_setup_tc_qdisc_prio_clean_stats(struct mlxsw_sp_port *mlxsw_sp_port,
stats_base->drops = 0;
for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
stats_base->drops += xstats->tail_drop[i];
stats_base->drops += mlxsw_sp_xstats_tail_drop(xstats, i);
stats_base->drops += xstats->wred_drop[i];
}