From 98ceb7b6d64552f995973be1a0ee9af0bf85fb3d Mon Sep 17 00:00:00 2001 From: Nogah Frankel Date: Wed, 28 Feb 2018 10:45:05 +0100 Subject: [PATCH] mlxsw: spectrum: qdiscs: prio: Delete child qdiscs when removing bands When the number the bands of sch_prio is decreased, child qdiscs on the deleted bands would get deleted as well. This change and deletions are being done under sch_tree_lock of the sch_prio qdisc. Part of the destruction of qdisc is unoffloading it, if it is offloaded. Un-offloading can't be done inside this lock. Move the offload command to be done before reducing the number of bands, so unoffloading of the qdiscs that are about to be deleted could be done outside of the lock. Signed-off-by: Nogah Frankel Reviewed-by: Yuval Mintz Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller --- .../net/ethernet/mellanox/mlxsw/spectrum_qdisc.c | 7 ++++++- net/sched/sch_prio.c | 13 ++++++------- 2 files changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c index bed7495d35d6..a2a3ac09c3bc 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c @@ -547,7 +547,12 @@ mlxsw_sp_qdisc_prio_replace(struct mlxsw_sp_port *mlxsw_sp_port, child_qdisc->stats_base.backlog = backlog; } } - + for (; band < IEEE_8021QAZ_MAX_TCS; band++) { + tclass = MLXSW_SP_PRIO_BAND_TO_TCLASS(band); + child_qdisc = &mlxsw_sp_port->tclass_qdiscs[tclass]; + child_qdisc->prio_bitmap = 0; + mlxsw_sp_qdisc_destroy(mlxsw_sp_port, child_qdisc); + } return 0; } diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c index efbf51f35778..ba2d6d17d95a 100644 --- a/net/sched/sch_prio.c +++ b/net/sched/sch_prio.c @@ -142,9 +142,8 @@ prio_reset(struct Qdisc *sch) sch->q.qlen = 0; } -static int prio_offload(struct Qdisc *sch, bool enable) +static int prio_offload(struct Qdisc *sch, struct tc_prio_qopt *qopt) { - struct prio_sched_data *q = qdisc_priv(sch); struct net_device *dev = qdisc_dev(sch); struct tc_prio_qopt_offload opt = { .handle = sch->handle, @@ -154,10 +153,10 @@ static int prio_offload(struct Qdisc *sch, bool enable) if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) return -EOPNOTSUPP; - if (enable) { + if (qopt) { opt.command = TC_PRIO_REPLACE; - opt.replace_params.bands = q->bands; - memcpy(&opt.replace_params.priomap, q->prio2band, + opt.replace_params.bands = qopt->bands; + memcpy(&opt.replace_params.priomap, qopt->priomap, TC_PRIO_MAX + 1); opt.replace_params.qstats = &sch->qstats; } else { @@ -174,7 +173,7 @@ prio_destroy(struct Qdisc *sch) struct prio_sched_data *q = qdisc_priv(sch); tcf_block_put(q->block); - prio_offload(sch, false); + prio_offload(sch, NULL); for (prio = 0; prio < q->bands; prio++) qdisc_destroy(q->queues[prio]); } @@ -211,6 +210,7 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt, } } + prio_offload(sch, qopt); sch_tree_lock(sch); q->bands = qopt->bands; memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1); @@ -230,7 +230,6 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt, } sch_tree_unlock(sch); - prio_offload(sch, true); return 0; }