From: Jason Gunthorpe <jgg@xxxxxxxxxx>
The struct mlx5_ib_mr can be used for three different things, but only one
at a time:
- In the user MR cache
- As a kernel MR
- As a user MR
Overlay the three things into a single union with the following rules:
- If the mr is found on the cache_ent->head list then it is a cache MR
and umem == NULL. The entire union is zero after the MR is removed from
the cache.
- If umem != NULL or type == IB_MR_TYPE_USER then it is a user MR.
- If umem == NULL then it is a kernel MR
This reduces the size of struct mlx5_ib_mr to 552 bytes from 702.
The only place the three flows overlap in the code is during dereg, so add
a few extra checks along there.
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
---
drivers/infiniband/hw/mlx5/mlx5_ib.h | 2 +-
drivers/infiniband/hw/mlx5/mr.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 5bfd14c438c1..03deca79c9cf 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -657,7 +657,7 @@ struct mlx5_ib_mr {
struct ib_umem *umem;
/* This is zero'd when the MR is allocated */
- struct {
+ union {
/* Used only while the MR is in the cache */
struct {
u32 out[MLX5_ST_SZ_DW(create_mkey_out)];
diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index ea8f068a6da3..54fd38b01a7e 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1929,7 +1929,7 @@ mlx5_alloc_priv_descs(struct ib_device *device,
static void
mlx5_free_priv_descs(struct mlx5_ib_mr *mr)
{
- if (mr->descs) {
+ if (!mr->umem && mr->descs) {
struct ib_device *device = mr->ibmr.device;
int size = mr->max_descs * mr->desc_size;
struct mlx5_ib_dev *dev = to_mdev(device);
@@ -1943,7 +1943,7 @@ mlx5_free_priv_descs(struct mlx5_ib_mr *mr)
static void clean_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
{
- if (mr->sig) {
+ if (mr->ibmr.type == IB_MR_TYPE_INTEGRITY) {
if (mlx5_core_destroy_psv(dev->mdev,
mr->sig->psv_memory.psv_idx))
mlx5_ib_warn(dev, "failed to destroy mem psv %d\n",
--
2.29.2
