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Commit 2810c3b2 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

mlxsw: spectrum_router: Offload blackhole routes 



Create a new FIB entry type for blackhole routes and set it in case the
type of the notified route is 'RTN_BLACKHOLE'.

Program such routes with a discard action and mark them as offloaded
since the device is dropping the packets instead of the kernel.

Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 554c88ac

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

+25 −2
Original line number Diff line number Diff line
@@ -364,6 +364,7 @@ enum mlxsw_sp_fib_entry_type { 
	MLXSW_SP_FIB_ENTRY_TYPE_REMOTE,

	MLXSW_SP_FIB_ENTRY_TYPE_LOCAL,

	MLXSW_SP_FIB_ENTRY_TYPE_TRAP,

	MLXSW_SP_FIB_ENTRY_TYPE_BLACKHOLE,



	/* This is a special case of local delivery, where a packet should be

	 * decapsulated on reception. Note that there is no corresponding ENCAP,
@@ -3928,6 +3929,7 @@ mlxsw_sp_fib_entry_should_offload(const struct mlxsw_sp_fib_entry *fib_entry) 
		return !!nh_group->adj_index_valid;

	case MLXSW_SP_FIB_ENTRY_TYPE_LOCAL:

		return !!nh_group->nh_rif;

	case MLXSW_SP_FIB_ENTRY_TYPE_BLACKHOLE:

	case MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP:

	case MLXSW_SP_FIB_ENTRY_TYPE_NVE_DECAP:

		return true;
@@ -3963,6 +3965,7 @@ mlxsw_sp_fib4_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry) 
	int i;



	if (fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_LOCAL ||

	    fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_BLACKHOLE ||

	    fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP ||

	    fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_NVE_DECAP) {

		nh_grp->nexthops->key.fib_nh->nh_flags |= RTNH_F_OFFLOAD;
@@ -4004,7 +4007,8 @@ mlxsw_sp_fib6_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry) 
	fib6_entry = container_of(fib_entry, struct mlxsw_sp_fib6_entry,

				  common);



	if (fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_LOCAL) {

	if (fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_LOCAL ||

	    fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_BLACKHOLE) {

		list_first_entry(&fib6_entry->rt6_list, struct mlxsw_sp_rt6,

				 list)->rt->fib6_nh.nh_flags |= RTNH_F_OFFLOAD;

		return;
@@ -4172,6 +4176,19 @@ static int mlxsw_sp_fib_entry_op_trap(struct mlxsw_sp *mlxsw_sp, 
	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);

}



static int mlxsw_sp_fib_entry_op_blackhole(struct mlxsw_sp *mlxsw_sp,

					   struct mlxsw_sp_fib_entry *fib_entry,

					   enum mlxsw_reg_ralue_op op)

{

	enum mlxsw_reg_ralue_trap_action trap_action;

	char ralue_pl[MLXSW_REG_RALUE_LEN];



	trap_action = MLXSW_REG_RALUE_TRAP_ACTION_DISCARD_ERROR;

	mlxsw_sp_fib_entry_ralue_pack(ralue_pl, fib_entry, op);

	mlxsw_reg_ralue_act_local_pack(ralue_pl, trap_action, 0, 0);

	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);

}



static int

mlxsw_sp_fib_entry_op_ipip_decap(struct mlxsw_sp *mlxsw_sp,

				 struct mlxsw_sp_fib_entry *fib_entry,
@@ -4211,6 +4228,8 @@ static int __mlxsw_sp_fib_entry_op(struct mlxsw_sp *mlxsw_sp, 
		return mlxsw_sp_fib_entry_op_local(mlxsw_sp, fib_entry, op);

	case MLXSW_SP_FIB_ENTRY_TYPE_TRAP:

		return mlxsw_sp_fib_entry_op_trap(mlxsw_sp, fib_entry, op);

	case MLXSW_SP_FIB_ENTRY_TYPE_BLACKHOLE:

		return mlxsw_sp_fib_entry_op_blackhole(mlxsw_sp, fib_entry, op);

	case MLXSW_SP_FIB_ENTRY_TYPE_IPIP_DECAP:

		return mlxsw_sp_fib_entry_op_ipip_decap(mlxsw_sp,

							fib_entry, op);
@@ -4279,8 +4298,10 @@ mlxsw_sp_fib4_entry_type_set(struct mlxsw_sp *mlxsw_sp, 
	case RTN_BROADCAST:

		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;

		return 0;

	case RTN_BLACKHOLE:

		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_BLACKHOLE;

		return 0;

	case RTN_UNREACHABLE: /* fall through */

	case RTN_BLACKHOLE: /* fall through */

	case RTN_PROHIBIT:

		/* Packets hitting these routes need to be trapped, but

		 * can do so with a lower priority than packets directed
@@ -5229,6 +5250,8 @@ static void mlxsw_sp_fib6_entry_type_set(struct mlxsw_sp *mlxsw_sp, 
	 */

	if (rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))

		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;

	else if (rt->fib6_type == RTN_BLACKHOLE)

		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_BLACKHOLE;

	else if (rt->fib6_flags & RTF_REJECT)

		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;

	else if (mlxsw_sp_rt6_is_gateway(mlxsw_sp, rt))