[RFC PATCH v2 09/22] devlink: convert snapshot destructor callback to region op

Jacob Keller
2020-02-14T23:23:05Z

It does not makes sense that two snapshots for a given region would use
different destructors. Simplify snapshot creation by adding
a .destructor op for regions.

This operation will replace the data_destructor for the snapshot
creation, and makes snapshot creation easier.

Noticed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
---
drivers/net/ethernet/mellanox/mlx4/crdump.c | 6 ++++--
drivers/net/netdevsim/dev.c | 3 ++-
include/net/devlink.h | 7 +++----
net/core/devlink.c | 11 +++++------
4 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/crdump.c b/drivers/net/ethernet/mellanox/mlx4/crdump.c
index cc2bf596c74b..c3f90c0f9554 100644
--- a/drivers/net/ethernet/mellanox/mlx4/crdump.c
+++ b/drivers/net/ethernet/mellanox/mlx4/crdump.c
@@ -43,10 +43,12 @@ static const char * const region_fw_health_str = "fw-health";

static const struct devlink_region_ops region_cr_space_ops = {
.name = region_cr_space_str,
+ .destructor = &kvfree,
};

static const struct devlink_region_ops region_fw_health_ops = {
.name = region_fw_health_str,
+ .destructor = &kvfree,
};

/* Set to true in case cr enable bit was set to true before crdump */
@@ -107,7 +109,7 @@ static void mlx4_crdump_collect_crspace(struct mlx4_dev *dev,
readl(cr_space + offset);

err = devlink_region_snapshot_create(crdump->region_crspace,
- crspace_data, id, &kvfree);
+ crspace_data, id);
if (err) {
kvfree(crspace_data);
mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",
@@ -146,7 +148,7 @@ static void mlx4_crdump_collect_fw_health(struct mlx4_dev *dev,
readl(health_buf_start + offset);

err = devlink_region_snapshot_create(crdump->region_fw_health,
- health_data, id, &kvfree);
+ health_data, id);
if (err) {
kvfree(health_data);
mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 3365de48ea9d..5b1ba67fd4a0 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -55,7 +55,7 @@ static ssize_t nsim_dev_take_snapshot_write(struct file *file,

id = devlink_region_snapshot_id_get(priv_to_devlink(nsim_dev));
err = devlink_region_snapshot_create(nsim_dev->dummy_region,
- dummy_data, id, kfree);
+ dummy_data, id);
if (err) {
pr_err("Failed to create region snapshot\n");
kfree(dummy_data);
@@ -247,6 +247,7 @@ static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)

static const struct devlink_region_ops dummy_region_ops = {
.name = "dummy",
+ .destructor = &kfree,
};

static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 7012bda22aa8..437d3f51a5ab 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -493,14 +493,14 @@ enum devlink_param_generic_id {
struct devlink_region;
struct devlink_info_req;

-typedef void devlink_snapshot_data_dest_t(const void *data);
-
/**
* struct devlink_region_ops - Region operations
* @name: region name
+ * @destructor: callback used to free snapshot memory when deleting
*/
struct devlink_region_ops {
const char *name;
+ void (*destructor)(const void *data);
};

struct devlink_fmsg;
@@ -964,8 +964,7 @@ devlink_region_create(struct devlink *devlink,
void devlink_region_destroy(struct devlink_region *region);
u32 devlink_region_snapshot_id_get(struct devlink *devlink);
int devlink_region_snapshot_create(struct devlink_region *region,
- u8 *data, u32 snapshot_id,
- devlink_snapshot_data_dest_t *data_destructor);
+ u8 *data, u32 snapshot_id);
int devlink_info_serial_number_put(struct devlink_info_req *req,
const char *sn);
int devlink_info_driver_name_put(struct devlink_info_req *req,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 4128fd1f604a..7f9e98776434 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -354,7 +354,6 @@ struct devlink_region {
struct devlink_snapshot {
struct list_head list;
struct devlink_region *region;
- devlink_snapshot_data_dest_t *data_destructor;
u8 *data;
u32 id;
};
@@ -3767,7 +3766,7 @@ static void devlink_region_snapshot_del(struct devlink_region *region,
devlink_nl_region_notify(region, snapshot, DEVLINK_CMD_REGION_DEL);
region->cur_snapshots--;
list_del(&snapshot->list);
- (*snapshot->data_destructor)(snapshot->data);
+ region->ops->destructor(snapshot->data);
kfree(snapshot);
}

@@ -7548,6 +7547,9 @@ devlink_region_create(struct devlink *devlink,
struct devlink_region *region;
int err = 0;

+ if (WARN_ON(!ops) || WARN_ON(!ops->destructor))
+ return ERR_PTR(-EINVAL);
+
mutex_lock(&devlink->lock);

if (devlink_region_get_by_name(devlink, ops->name)) {
@@ -7634,11 +7636,9 @@ EXPORT_SYMBOL_GPL(devlink_region_snapshot_id_get);
* @region: devlink region of the snapshot
* @data: snapshot data
* @snapshot_id: snapshot id to be created
- * @data_destructor: pointer to destructor function to free data
*/
int devlink_region_snapshot_create(struct devlink_region *region,
- u8 *data, u32 snapshot_id,
- devlink_snapshot_data_dest_t *data_destructor)
+ u8 *data, u32 snapshot_id)
{
struct devlink *devlink = region->devlink;
struct devlink_snapshot *snapshot;
@@ -7666,7 +7666,6 @@ int devlink_region_snapshot_create(struct devlink_region *region,
snapshot->id = snapshot_id;
snapshot->region = region;
snapshot->data = data;
- snapshot->data_destructor = data_destructor;

list_add_tail(&snapshot->list, &region->snapshot_list);

--
2.25.0.368.g28a2d05eebfb