[RFC PATCH v2 08/22] devlink: prepare to support region operations

Jacob Keller
2020-02-14T23:23:12Z

Modify the devlink region code in preparation for adding new operations
on regions.

Create a devlink_region_ops structure, and move the name pointer from
within the devlink_region structure into the ops structure (similar to
the devlink_health_reporter_ops).

This prepares the regions to enable support of additional operations in
the future such as requesting snapshots, or accessing the region
directly without a snapshot.

In order to re-use the constant strings in the mlx4 driver their
declaration must be changed to 'const char * const' to ensure the
compiler realizes that both the data and the pointer cannot change.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/mellanox/mlx4/crdump.c | 16 +++++++++++----
drivers/net/netdevsim/dev.c | 6 +++++-
include/net/devlink.h | 16 +++++++++++----
net/core/devlink.c | 22 ++++++++++-----------
4 files changed, 40 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/crdump.c b/drivers/net/ethernet/mellanox/mlx4/crdump.c
index 64ed725aec28..cc2bf596c74b 100644
--- a/drivers/net/ethernet/mellanox/mlx4/crdump.c
+++ b/drivers/net/ethernet/mellanox/mlx4/crdump.c
@@ -38,8 +38,16 @@
#define CR_ENABLE_BIT_OFFSET 0xF3F04
#define MAX_NUM_OF_DUMPS_TO_STORE (8)

-static const char *region_cr_space_str = "cr-space";
-static const char *region_fw_health_str = "fw-health";
+static const char * const region_cr_space_str = "cr-space";
+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,
+};
+
+static const struct devlink_region_ops region_fw_health_ops = {
+ .name = region_fw_health_str,
+};

/* Set to true in case cr enable bit was set to true before crdump */
static bool crdump_enbale_bit_set;
@@ -205,7 +213,7 @@ int mlx4_crdump_init(struct mlx4_dev *dev)
/* Create cr-space region */
crdump->region_crspace =
devlink_region_create(devlink,
- region_cr_space_str,
+ &region_cr_space_ops,
MAX_NUM_OF_DUMPS_TO_STORE,
pci_resource_len(pdev, 0));
if (IS_ERR(crdump->region_crspace))
@@ -216,7 +224,7 @@ int mlx4_crdump_init(struct mlx4_dev *dev)
/* Create fw-health region */
crdump->region_fw_health =
devlink_region_create(devlink,
- region_fw_health_str,
+ &region_fw_health_ops,
MAX_NUM_OF_DUMPS_TO_STORE,
HEALTH_BUFFER_SIZE);
if (IS_ERR(crdump->region_fw_health))
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index d7706a0346f2..3365de48ea9d 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -245,11 +245,15 @@ static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)

#define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16

+static const struct devlink_region_ops dummy_region_ops = {
+ .name = "dummy",
+};
+
static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,
struct devlink *devlink)
{
nsim_dev->dummy_region =
- devlink_region_create(devlink, "dummy",
+ devlink_region_create(devlink, &dummy_region_ops,
NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,
NSIM_DEV_DUMMY_REGION_SIZE);
return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);
diff --git a/include/net/devlink.h b/include/net/devlink.h
index ce5cea428fdc..7012bda22aa8 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -495,6 +495,14 @@ struct devlink_info_req;

typedef void devlink_snapshot_data_dest_t(const void *data);

+/**
+ * struct devlink_region_ops - Region operations
+ * @name: region name
+ */
+struct devlink_region_ops {
+ const char *name;
+};
+
struct devlink_fmsg;
struct devlink_health_reporter;

@@ -949,10 +957,10 @@ void devlink_port_param_value_changed(struct devlink_port *devlink_port,
u32 param_id);
void devlink_param_value_str_fill(union devlink_param_value *dst_val,
const char *src);
-struct devlink_region *devlink_region_create(struct devlink *devlink,
- const char *region_name,
- u32 region_max_snapshots,
- u64 region_size);
+struct devlink_region *
+devlink_region_create(struct devlink *devlink,
+ const struct devlink_region_ops *ops,
+ u32 region_max_snapshots, u64 region_size);
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,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 549ee56b7a21..4128fd1f604a 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -344,7 +344,7 @@ devlink_sb_tc_index_get_from_info(struct devlink_sb *devlink_sb,
struct devlink_region {
struct devlink *devlink;
struct list_head list;
- const char *name;
+ const struct devlink_region_ops *ops;
struct list_head snapshot_list;
u32 max_snapshots;
u32 cur_snapshots;
@@ -365,7 +365,7 @@ devlink_region_get_by_name(struct devlink *devlink, const char *region_name)
struct devlink_region *region;

list_for_each_entry(region, &devlink->region_list, list)
- if (!strcmp(region->name, region_name))
+ if (!strcmp(region->ops->name, region_name))
return region;

return NULL;
@@ -3687,7 +3687,7 @@ static int devlink_nl_region_fill(struct sk_buff *msg, struct devlink *devlink,
if (err)
goto nla_put_failure;

- err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME, region->name);
+ err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME, region->ops->name);
if (err)
goto nla_put_failure;

@@ -3733,7 +3733,7 @@ static void devlink_nl_region_notify(struct devlink_region *region,
goto out_cancel_msg;

err = nla_put_string(msg, DEVLINK_ATTR_REGION_NAME,
- region->name);
+ region->ops->name);
if (err)
goto out_cancel_msg;

@@ -7536,21 +7536,21 @@ EXPORT_SYMBOL_GPL(devlink_param_value_str_fill);
* devlink_region_create - create a new address region
*
* @devlink: devlink
- * @region_name: region name
+ * @ops: region operations and name
* @region_max_snapshots: Maximum supported number of snapshots for region
* @region_size: size of region
*/
-struct devlink_region *devlink_region_create(struct devlink *devlink,
- const char *region_name,
- u32 region_max_snapshots,
- u64 region_size)
+struct devlink_region *
+devlink_region_create(struct devlink *devlink,
+ const struct devlink_region_ops *ops,
+ u32 region_max_snapshots, u64 region_size)
{
struct devlink_region *region;
int err = 0;

mutex_lock(&devlink->lock);

- if (devlink_region_get_by_name(devlink, region_name)) {
+ if (devlink_region_get_by_name(devlink, ops->name)) {
err = -EEXIST;
goto unlock;
}
@@ -7563,7 +7563,7 @@ struct devlink_region *devlink_region_create(struct devlink *devlink,

region->devlink = devlink;
region->max_snapshots = region_max_snapshots;
- region->name = region_name;
+ region->ops = ops;
region->size = region_size;
INIT_LIST_HEAD(&region->snapshot_list);
list_add_tail(&region->list, &devlink->region_list);
--
2.25.0.368.g28a2d05eebfb