From 85005b82e59fa7bb7388b12594ab2067bf73d66c Mon Sep 17 00:00:00 2001 From: Petr Machata Date: Wed, 15 Jan 2020 13:53:49 +0200 Subject: [PATCH] mlxsw: spectrum_qdisc: Include MC TCs in Qdisc counters 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: 7b8195306694 ("mlxsw: spectrum: Configure MC-aware mode on mlxsw ports") Signed-off-by: Petr Machata Acked-by: Jiri Pirko Signed-off-by: Ido Schimmel Signed-off-by: David S. Miller --- .../ethernet/mellanox/mlxsw/spectrum_qdisc.c | 30 ++++++++++++++----- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c index 46d43cfd04e9..0124bfe1963b 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c @@ -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]; }