net: microchip: Constify struct vcap_operations

"struct vcap_operations" are not modified in these drivers.

Constifying this structure moves some data to a read-only section, so
increase overall security.

In order to do it, "struct vcap_control" also needs to be adjusted to this
new const qualifier.

As an example, on a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
  15176	   1094	     16	  16286	   3f9e	drivers/net/ethernet/microchip/lan966x/lan966x_vcap_impl.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  15268	    998	     16	  16282	   3f9a	drivers/net/ethernet/microchip/lan966x/lan966x_vcap_impl.o
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://lore.kernel.org/r/d8e76094d2e98ebb5bfc8205799b3a9db0b46220.1718524644.git.christophe.jaillet@wanadoo.frSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/microchip/lan966x/lan966x_vcap_impl.c

@@ -581,7 +581,7 @@ static void lan966x_vcap_move(struct net_device *dev,
 	lan966x_vcap_wait_update(lan966x, admin->tgt_inst);
 }
 
-static struct vcap_operations lan966x_vcap_ops = {
+static const struct vcap_operations lan966x_vcap_ops = {
 	.validate_keyset = lan966x_vcap_validate_keyset,
 	.add_default_fields = lan966x_vcap_add_default_fields,
 	.cache_erase = lan966x_vcap_cache_erase,

drivers/net/ethernet/microchip/sparx5/sparx5_vcap_impl.c

@@ -1507,7 +1507,7 @@ static void sparx5_vcap_move(struct net_device *ndev, struct vcap_admin *admin,
 	}
 }
 
-static struct vcap_operations sparx5_vcap_ops = {
+static const struct vcap_operations sparx5_vcap_ops = {
 	.validate_keyset = sparx5_vcap_validate_keyset,
 	.add_default_fields = sparx5_vcap_add_default_fields,
 	.cache_erase = sparx5_vcap_cache_erase,

drivers/net/ethernet/microchip/vcap/vcap_api.h

@@ -271,7 +271,7 @@ struct vcap_operations {
 
 /* VCAP API Client control interface */
 struct vcap_control {
-	struct vcap_operations *ops;  /* client supplied operations */
+	const struct vcap_operations *ops;  /* client supplied operations */
 	const struct vcap_info *vcaps; /* client supplied vcap models */
 	const struct vcap_statistics *stats; /* client supplied vcap stats */
 	struct list_head list; /* list of vcap instances */

drivers/net/ethernet/microchip/vcap/vcap_api_debugfs_kunit.c

@@ -221,7 +221,7 @@ static int vcap_test_port_info(struct net_device *ndev,
 	return 0;
 }
 
-static struct vcap_operations test_callbacks = {
+static const struct vcap_operations test_callbacks = {
 	.validate_keyset = test_val_keyset,
 	.add_default_fields = test_add_def_fields,
 	.cache_erase = test_cache_erase,

drivers/net/ethernet/microchip/vcap/vcap_api_kunit.c

@@ -211,7 +211,7 @@ static int vcap_test_port_info(struct net_device *ndev,
 	return 0;
 }
 
-static struct vcap_operations test_callbacks = {
+static const struct vcap_operations test_callbacks = {
 	.validate_keyset = test_val_keyset,
 	.add_default_fields = test_add_def_fields,
 	.cache_erase = test_cache_erase,