diff options
| author |   Leon Romanovsky <leonro@mellanox.com> | 2020-09-07 15:09:15 +0300 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@nvidia.com> | 2020-09-09 14:04:13 -0300 |
| commit | fd89099d635e67f22c3eda263bef1f27f9d5dcb5 (patch) | |
| tree | 9f90ba377b044efeb89c49d6603f6d715d0e8132 /drivers | |
| parent | RDMA: Restore ability to fail on AH destroy (diff) | |
| download | linux-dev-fd89099d635e67f22c3eda263bef1f27f9d5dcb5.tar.xz linux-dev-fd89099d635e67f22c3eda263bef1f27f9d5dcb5.zip | |
RDMA/mlx5: Issue FW command to destroy SRQ on reentry
The HW release can fail and leave the system in limbo state, where SRQ is
removed from the table, but can't be destroyed later. In every reentry,
the initial xa_erase_irq() check will fail.
Rewrite the erase logic to keep index, but don't store the entry
itself. By doing it, we can safely reinsert entry back in the case of
destroy failure.
Link: https://lore.kernel.org/r/20200907120921.476363-4-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/srq_cmd.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/mlx5/srq_cmd.c b/drivers/infiniband/hw/mlx5/srq_cmd.c index 37aaacebd3f2..c53acbc63d0b 100644 --- a/drivers/infiniband/hw/mlx5/srq_cmd.c +++ b/drivers/infiniband/hw/mlx5/srq_cmd.c @@ -596,13 +596,22 @@ void mlx5_cmd_destroy_srq(struct mlx5_ib_dev *dev, struct mlx5_core_srq *srq) struct mlx5_core_srq *tmp; int err; - tmp = xa_erase_irq(&table->array, srq->srqn); - if (!tmp || tmp != srq) + /* Delete entry, but leave index occupied */ + tmp = xa_cmpxchg_irq(&table->array, srq->srqn, srq, XA_ZERO_ENTRY, 0); + if (WARN_ON(tmp != srq)) return; err = destroy_srq_split(dev, srq); - if (err) + if (err) { + /* + * We don't need to check returned result for an error, + * because we are storing in pre-allocated space xarray + * entry and it can't fail at this stage. + */ + xa_cmpxchg_irq(&table->array, srq->srqn, XA_ZERO_ENTRY, srq, 0); return; + } + xa_erase_irq(&table->array, srq->srqn); mlx5_core_res_put(&srq->common); wait_for_completion(&srq->common.free); |