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| author | Maxim Mikityanskiy <maximmi@nvidia.com> | 2021-08-26 14:54:25 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-08-31 02:33:59 +0300 |
| commit | ca49bfd90a9dde175d2929dc1544b54841e33804 (patch) | |
| tree | c52af23984e7acfb4c82285ca771cb5687be6224 /drivers/net/ethernet/mellanox/mlx5/core/en_main.c | |
| parent | 1b9fbe813016b08e08b22ddba4ddbf9cb1b04b00 (diff) | |
| download | linux-ca49bfd90a9dde175d2929dc1544b54841e33804.tar.xz | |
sch_htb: Fix inconsistency when leaf qdisc creation fails
In HTB offload mode, qdiscs of leaf classes are grafted to netdev
queues. sch_htb expects the dev_queue field of these qdiscs to point to
the corresponding queues. However, qdisc creation may fail, and in that
case noop_qdisc is used instead. Its dev_queue doesn't point to the
right queue, so sch_htb can lose track of used netdev queues, which will
cause internal inconsistencies.
This commit fixes this bug by keeping track of the netdev queue inside
struct htb_class. All reads of cl->leaf.q->dev_queue are replaced by the
new field, the two values are synced on writes, and WARNs are added to
assert equality of the two values.
The driver API has changed: when TC_HTB_LEAF_DEL needs to move a queue,
the driver used to pass the old and new queue IDs to sch_htb. Now that
there is a new field (offload_queue) in struct htb_class that needs to
be updated on this operation, the driver will pass the old class ID to
sch_htb instead (it already knows the new class ID).
Fixes: d03b195b5aa0 ("sch_htb: Hierarchical QoS hardware offload")
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20210826115425.1744053-1-maximmi@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/en_main.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index 26d2f78c7706..47efd858964d 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -3000,8 +3000,7 @@ static int mlx5e_setup_tc_htb(struct mlx5e_priv *priv, struct tc_htb_qopt_offloa return mlx5e_htb_leaf_to_inner(priv, htb->parent_classid, htb->classid, htb->rate, htb->ceil, htb->extack); case TC_HTB_LEAF_DEL: - return mlx5e_htb_leaf_del(priv, htb->classid, &htb->moved_qid, &htb->qid, - htb->extack); + return mlx5e_htb_leaf_del(priv, &htb->classid, htb->extack); case TC_HTB_LEAF_DEL_LAST: case TC_HTB_LEAF_DEL_LAST_FORCE: return mlx5e_htb_leaf_del_last(priv, htb->classid, |