mlxsw: spectrum_router: Have FIB entry op context allocated for the instance

Get the max size needed for FIB entry op context and allocate it once
for the instance. Use it repeatedly from the scheduled work.
By this, allow to extend the context to hold more data than it is wise
to do when it was on the stack. Make sure to signalize that the context
needs to be initialized in case families of subsequent FIB entries differ.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.h

@@ -15,6 +15,23 @@ struct mlxsw_sp_router_nve_decap {
 	u8 valid:1;
 };
 
+struct mlxsw_sp_fib_entry_op_ctx {
+	u8 bulk_ok:1, /* Indicate to the low-level op it is ok to bulk
+		       * the actual entry with the one that is the next
+		       * in queue.
+		       */
+	   initialized:1; /* Bit that the low-level op sets in case
+			   * the context priv is initialized.
+			   */
+	unsigned long ll_priv[];
+};
+
+static inline void
+mlxsw_sp_fib_entry_op_ctx_clear(struct mlxsw_sp_fib_entry_op_ctx *op_ctx)
+{
+	memset(op_ctx, 0, sizeof(*op_ctx));
+}
+
 struct mlxsw_sp_router {
 	struct mlxsw_sp *mlxsw_sp;
 	struct mlxsw_sp_rif **rifs;
@@ -53,6 +70,7 @@ struct mlxsw_sp_router {
 	spinlock_t fib_event_queue_lock; /* Protects fib event queue list */
 	/* One set of ops for each protocol: IPv4 and IPv6 */
 	const struct mlxsw_sp_router_ll_ops *proto_ll_ops[MLXSW_SP_L3_PROTO_MAX];
+	struct mlxsw_sp_fib_entry_op_ctx *ll_op_ctx;
 };
 
 enum mlxsw_sp_fib_entry_op {
@@ -60,11 +78,6 @@ enum mlxsw_sp_fib_entry_op {
 	MLXSW_SP_FIB_ENTRY_OP_DELETE,
 };
 
-struct mlxsw_sp_fib_entry_op_ctx {
-	u8 bulk_ok:1;
-	char ralue_pl[MLXSW_REG_RALUE_LEN];
-};
-
 /* Low-level router ops. Basically this is to handle the different
  * register sets to work with ordinary and XM trees and FIB entries.
  */
@@ -72,6 +85,7 @@ struct mlxsw_sp_router_ll_ops {
 	int (*ralta_write)(struct mlxsw_sp *mlxsw_sp, char *xralta_pl);
 	int (*ralst_write)(struct mlxsw_sp *mlxsw_sp, char *xralst_pl);
 	int (*raltb_write)(struct mlxsw_sp *mlxsw_sp, char *xraltb_pl);
+	size_t fib_entry_op_ctx_size;
 	void (*fib_entry_pack)(struct mlxsw_sp_fib_entry_op_ctx *op_ctx,
 			       enum mlxsw_sp_l3proto proto, enum mlxsw_sp_fib_entry_op op,
 			       u16 virtual_router, u8 prefix_len, unsigned char *addr);