Commit 5a4d148f authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'per-nexthop-offload' 



Jiri Pirko says:

====================
ipv4: fib: Provide per-nexthop offload indication

Ido says:

Offload indication for IPv4 routes is currently set in the FIB info's
flags. When multipath routes are employed, this can lead to a route being
marked as offloaded although only one of its nexthops is actually
offloaded.

Instead, this patchset aims to proivde a higher resolution for the offload
indication and report it on a per-nexthop basis.

Example output from patched iproute:

$ ip route show 192.168.200.0/24
192.168.200.0/24
        nexthop via 192.168.100.2 dev enp3s0np7 weight 1 offload
        nexthop via 192.168.101.3 dev enp3s0np8 weight 1

And once the second gateway is resolved:

$ ip route show 192.168.200.0/24
192.168.200.0/24
        nexthop via 192.168.100.2 dev enp3s0np7 weight 1 offload
        nexthop via 192.168.101.3 dev enp3s0np8 weight 1 offload

First patch teaches the kernel to look for the offload indication in the
nexthop flags. Patches 2-5 adjust current capable drivers to provide
offload indication on a per-nexthop basis. Last patch removes no longer
used functions to set offload indication in the FIB info's flags.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 9820355f 2202e35d

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

+60 −13
Original line number Diff line number Diff line
@@ -394,7 +394,6 @@ struct mlxsw_sp_fib_entry { 
	enum mlxsw_sp_fib_entry_type type;

	struct list_head nexthop_group_node;

	struct mlxsw_sp_nexthop_group *nh_group;

	bool offloaded;

};



struct mlxsw_sp_fib4_entry {
@@ -1653,6 +1652,24 @@ mlxsw_sp_nexthop_fib_entries_update(struct mlxsw_sp *mlxsw_sp, 
	return 0;

}



static void

mlxsw_sp_fib_entry_offload_refresh(struct mlxsw_sp_fib_entry *fib_entry,

				   enum mlxsw_reg_ralue_op op, int err);



static void

mlxsw_sp_nexthop_fib_entries_refresh(struct mlxsw_sp_nexthop_group *nh_grp)

{

	enum mlxsw_reg_ralue_op op = MLXSW_REG_RALUE_OP_WRITE_WRITE;

	struct mlxsw_sp_fib_entry *fib_entry;



	list_for_each_entry(fib_entry, &nh_grp->fib_list, nexthop_group_node) {

		if (!mlxsw_sp_fib_node_entry_is_first(fib_entry->fib_node,

						      fib_entry))

			continue;

		mlxsw_sp_fib_entry_offload_refresh(fib_entry, op, 0);

	}

}



static void

mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,

			       struct mlxsw_sp_nexthop_group *nh_grp)
@@ -1740,6 +1757,10 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp, 
		dev_warn(mlxsw_sp->bus_info->dev, "Failed to mass-update adjacency index for nexthop group.\n");

		goto set_trap;

	}



	/* Offload state within the group changed, so update the flags. */

	mlxsw_sp_nexthop_fib_entries_refresh(nh_grp);



	return;



set_trap:
@@ -2103,13 +2124,45 @@ mlxsw_sp_fib_entry_should_offload(const struct mlxsw_sp_fib_entry *fib_entry) 
	}

}



static void mlxsw_sp_fib_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry)

static void

mlxsw_sp_fib4_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry)

{

	struct mlxsw_sp_nexthop_group *nh_grp = fib_entry->nh_group;

	int i;



	if (fib_entry->type == MLXSW_SP_FIB_ENTRY_TYPE_LOCAL) {

		nh_grp->nexthops->key.fib_nh->nh_flags |= RTNH_F_OFFLOAD;

		return;

	}



	for (i = 0; i < nh_grp->count; i++) {

		struct mlxsw_sp_nexthop *nh = &nh_grp->nexthops[i];



		if (nh->offloaded)

			nh->key.fib_nh->nh_flags |= RTNH_F_OFFLOAD;

		else

			nh->key.fib_nh->nh_flags &= ~RTNH_F_OFFLOAD;

	}

}



static void

mlxsw_sp_fib4_entry_offload_unset(struct mlxsw_sp_fib_entry *fib_entry)

{

	fib_entry->offloaded = true;

	struct mlxsw_sp_nexthop_group *nh_grp = fib_entry->nh_group;

	int i;



	for (i = 0; i < nh_grp->count; i++) {

		struct mlxsw_sp_nexthop *nh = &nh_grp->nexthops[i];



		nh->key.fib_nh->nh_flags &= ~RTNH_F_OFFLOAD;

	}

}



static void mlxsw_sp_fib_entry_offload_set(struct mlxsw_sp_fib_entry *fib_entry)

{

	switch (fib_entry->fib_node->fib->proto) {

	case MLXSW_SP_L3_PROTO_IPV4:

		fib_info_offload_inc(fib_entry->nh_group->key.fi);

		mlxsw_sp_fib4_entry_offload_set(fib_entry);

		break;

	case MLXSW_SP_L3_PROTO_IPV6:

		WARN_ON_ONCE(1);
@@ -2121,13 +2174,11 @@ mlxsw_sp_fib_entry_offload_unset(struct mlxsw_sp_fib_entry *fib_entry) 
{

	switch (fib_entry->fib_node->fib->proto) {

	case MLXSW_SP_L3_PROTO_IPV4:

		fib_info_offload_dec(fib_entry->nh_group->key.fi);

		mlxsw_sp_fib4_entry_offload_unset(fib_entry);

		break;

	case MLXSW_SP_L3_PROTO_IPV6:

		WARN_ON_ONCE(1);

	}



	fib_entry->offloaded = false;

}



static void
@@ -2136,17 +2187,13 @@ mlxsw_sp_fib_entry_offload_refresh(struct mlxsw_sp_fib_entry *fib_entry, 
{

	switch (op) {

	case MLXSW_REG_RALUE_OP_WRITE_DELETE:

		if (!fib_entry->offloaded)

			return;

		return mlxsw_sp_fib_entry_offload_unset(fib_entry);

	case MLXSW_REG_RALUE_OP_WRITE_WRITE:

		if (err)

			return;

		if (mlxsw_sp_fib_entry_should_offload(fib_entry) &&

		    !fib_entry->offloaded)

		if (mlxsw_sp_fib_entry_should_offload(fib_entry))

			mlxsw_sp_fib_entry_offload_set(fib_entry);

		else if (!mlxsw_sp_fib_entry_should_offload(fib_entry) &&

			 fib_entry->offloaded)

		else if (!mlxsw_sp_fib_entry_should_offload(fib_entry))

			mlxsw_sp_fib_entry_offload_unset(fib_entry);

		return;

	default:

drivers/net/ethernet/rocker/rocker_ofdpa.c

+3 −3
Original line number Diff line number Diff line
@@ -2761,7 +2761,7 @@ static int ofdpa_fib4_add(struct rocker *rocker, 
				  fen_info->tb_id, 0);

	if (err)

		return err;

	fib_info_offload_inc(fen_info->fi);

	fen_info->fi->fib_nh->nh_flags |= RTNH_F_OFFLOAD;

	return 0;

}
@@ -2776,7 +2776,7 @@ static int ofdpa_fib4_del(struct rocker *rocker, 
	ofdpa_port = ofdpa_port_dev_lower_find(fen_info->fi->fib_dev, rocker);

	if (!ofdpa_port)

		return 0;

	fib_info_offload_dec(fen_info->fi);

	fen_info->fi->fib_nh->nh_flags &= ~RTNH_F_OFFLOAD;

	return ofdpa_port_fib_ipv4(ofdpa_port, htonl(fen_info->dst),

				   fen_info->dst_len, fen_info->fi,

				   fen_info->tb_id, OFDPA_OP_FLAG_REMOVE);
@@ -2803,7 +2803,7 @@ static void ofdpa_fib4_abort(struct rocker *rocker) 
						       rocker);

		if (!ofdpa_port)

			continue;

		fib_info_offload_dec(flow_entry->fi);

		flow_entry->fi->fib_nh->nh_flags &= ~RTNH_F_OFFLOAD;

		ofdpa_flow_tbl_del(ofdpa_port, OFDPA_OP_FLAG_REMOVE,

				   flow_entry);

	}

include/net/ip_fib.h

+0 −13
Original line number Diff line number Diff line
@@ -124,7 +124,6 @@ struct fib_info { 
#ifdef CONFIG_IP_ROUTE_MULTIPATH

	int			fib_weight;

#endif

	unsigned int		fib_offload_cnt;

	struct rcu_head		rcu;

	struct fib_nh		fib_nh[0];

#define fib_dev		fib_nh[0].nh_dev
@@ -177,18 +176,6 @@ struct fib_result_nl { 


__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);



static inline void fib_info_offload_inc(struct fib_info *fi)

{

	fi->fib_offload_cnt++;

	fi->fib_flags |= RTNH_F_OFFLOAD;

}



static inline void fib_info_offload_dec(struct fib_info *fi)

{

	if (--fi->fib_offload_cnt == 0)

		fi->fib_flags &= ~RTNH_F_OFFLOAD;

}



#define FIB_RES_SADDR(net, res)				\

	((FIB_RES_NH(res).nh_saddr_genid ==		\

	  atomic_read(&(net)->ipv4.dev_addr_genid)) ?	\

net/ipv4/fib_semantics.c

+2 −0
Original line number Diff line number Diff line
@@ -1342,6 +1342,8 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event, 
			    IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))

				rtm->rtm_flags |= RTNH_F_DEAD;

		}

		if (fi->fib_nh->nh_flags & RTNH_F_OFFLOAD)

			rtm->rtm_flags |= RTNH_F_OFFLOAD;

#ifdef CONFIG_IP_ROUTE_CLASSID

		if (fi->fib_nh[0].nh_tclassid &&

		    nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid))

CRA Git | Maintained and supported by SUSTech CRA and CCSE