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net/mlx5: Wait for inactive autogroups

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[ Upstream commit 49c0355d301b4e0e01e0f19ddbb023bd7d0ee48c ]

Currently, if one thread tries to add an entry to an autogrouped table
with no free matching group, while another thread is in the process of
creating a new matching autogroup, it doesn't wait for the new group
creation, and creates an unnecessary new autogroup.

Instead of skipping inactive, wait on the write lock of those groups.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Stable-dep-of: 8ec40e3f1f72 ("net/mlx5: Fix return value when searching for existing flow group")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul Blakey 2020-05-07 12:01:39 +03:00 • committed by Greg Kroah-Hartman
commit 2fa390ee36
1 changed files with 5 additions and 3 deletions
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8
drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
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@ -1768,11 +1768,13 @@ skip_search:
list_for_each_entry(iter, match_head, list) {
g = iter->g;
if (!g->node.active)
continue;
nested_down_write_ref_node(&g->node, FS_LOCK_PARENT);
if (!g->node.active) {
up_write_ref_node(&g->node, false);
continue;
}
err = insert_fte(g, fte);
if (err) {
up_write_ref_node(&g->node, false);