Commit 5481d73f authored by David Ahern's avatar David Ahern Committed by David S. Miller
Browse files

ipv4: Use accessors for fib_info nexthop data 



Use helpers to access fib_nh and fib_nhs fields of a fib_info. Drop the
fib_dev macro which is an alias for the first nexthop. Replacements:

  fi->fib_dev    --> fib_info_nh(fi, 0)->fib_nh_dev
  fi->fib_nh     --> fib_info_nh(fi, 0)
  fi->fib_nh[i]  --> fib_info_nh(fi, i)
  fi->fib_nhs    --> fib_info_num_path(fi)

where fib_info_nh(fi, i) returns fi->fib_nh[nhsel] and fib_info_num_path
returns fi->fib_nhs.

Move the existing fib_info_nhc to nexthop.h and define the new ones
there. A later patch adds a check if a fib_info uses a nexthop object,
and defining the helpers in nexthop.h avoid circular header
dependencies.

After this all remaining open coded references to fi->fib_nhs and
fi->fib_nh are in:
- fib_create_info and helpers used to lookup an existing fib_info
  entry, and
- the netdev event functions fib_sync_down_dev and fib_sync_up.

The latter two will not be reused for nexthops, and the fib_create_info
will be updated to handle a nexthop in a fib_info.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7dd73168

drivers/net/ethernet/mellanox/mlx5/core/lag_mp.c

+19 −10
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
/* Copyright (c) 2019 Mellanox Technologies. */



#include <linux/netdevice.h>

#include <net/nexthop.h>

#include "lag.h"

#include "lag_mp.h"

#include "mlx5_core.h"
@@ -110,6 +111,8 @@ static void mlx5_lag_fib_route_event(struct mlx5_lag *ldev, 
				     struct fib_info *fi)

{

	struct lag_mp *mp = &ldev->lag_mp;

	struct fib_nh *fib_nh0, *fib_nh1;

	unsigned int nhs;



	/* Handle delete event */

	if (event == FIB_EVENT_ENTRY_DEL) {
@@ -120,9 +123,11 @@ static void mlx5_lag_fib_route_event(struct mlx5_lag *ldev, 
	}



	/* Handle add/replace event */

	if (fi->fib_nhs == 1) {

	nhs = fib_info_num_path(fi);

	if (nhs == 1) {

		if (__mlx5_lag_is_active(ldev)) {

			struct net_device *nh_dev = fi->fib_nh[0].fib_nh_dev;

			struct fib_nh *nh = fib_info_nh(fi, 0);

			struct net_device *nh_dev = nh->fib_nh_dev;

			int i = mlx5_lag_dev_get_netdev_idx(ldev, nh_dev);



			mlx5_lag_set_port_affinity(ldev, ++i);
@@ -130,14 +135,16 @@ static void mlx5_lag_fib_route_event(struct mlx5_lag *ldev, 
		return;

	}



	if (fi->fib_nhs != 2)

	if (nhs != 2)

		return;



	/* Verify next hops are ports of the same hca */

	if (!(fi->fib_nh[0].fib_nh_dev == ldev->pf[0].netdev &&

	      fi->fib_nh[1].fib_nh_dev == ldev->pf[1].netdev) &&

	    !(fi->fib_nh[0].fib_nh_dev == ldev->pf[1].netdev &&

	      fi->fib_nh[1].fib_nh_dev == ldev->pf[0].netdev)) {

	fib_nh0 = fib_info_nh(fi, 0);

	fib_nh1 = fib_info_nh(fi, 1);

	if (!(fib_nh0->fib_nh_dev == ldev->pf[0].netdev &&

	      fib_nh1->fib_nh_dev == ldev->pf[1].netdev) &&

	    !(fib_nh0->fib_nh_dev == ldev->pf[1].netdev &&

	      fib_nh1->fib_nh_dev == ldev->pf[0].netdev)) {

		mlx5_core_warn(ldev->pf[0].dev, "Multipath offload require two ports of the same HCA\n");

		return;

	}
@@ -174,7 +181,7 @@ static void mlx5_lag_fib_nexthop_event(struct mlx5_lag *ldev, 
			mlx5_lag_set_port_affinity(ldev, i);

		}

	} else if (event == FIB_EVENT_NH_ADD &&

		   fi->fib_nhs == 2) {

		   fib_info_num_path(fi) == 2) {

		mlx5_lag_set_port_affinity(ldev, 0);

	}

}
@@ -238,6 +245,7 @@ static int mlx5_lag_fib_event(struct notifier_block *nb, 
	struct mlx5_fib_event_work *fib_work;

	struct fib_entry_notifier_info *fen_info;

	struct fib_nh_notifier_info *fnh_info;

	struct net_device *fib_dev;

	struct fib_info *fi;



	if (info->family != AF_INET)
@@ -254,8 +262,9 @@ static int mlx5_lag_fib_event(struct notifier_block *nb, 
		fen_info = container_of(info, struct fib_entry_notifier_info,

					info);

		fi = fen_info->fi;

		if (fi->fib_dev != ldev->pf[0].netdev &&

		    fi->fib_dev != ldev->pf[1].netdev) {

		fib_dev = fib_info_nh(fen_info->fi, 0)->fib_nh_dev;

		if (fib_dev != ldev->pf[0].netdev &&

		    fib_dev != ldev->pf[1].netdev) {

			return NOTIFY_DONE;

		}

		fib_work = mlx5_lag_init_fib_work(ldev, event);

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

+11 −8
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <net/arp.h>

#include <net/ip_fib.h>

#include <net/ip6_fib.h>

#include <net/nexthop.h>

#include <net/fib_rules.h>

#include <net/ip_tunnels.h>

#include <net/l3mdev.h>
@@ -3816,23 +3817,25 @@ static void mlxsw_sp_nexthop_rif_gone_sync(struct mlxsw_sp *mlxsw_sp, 
}



static bool mlxsw_sp_fi_is_gateway(const struct mlxsw_sp *mlxsw_sp,

				   const struct fib_info *fi)

				   struct fib_info *fi)

{

	return fi->fib_nh->fib_nh_scope == RT_SCOPE_LINK ||

	       mlxsw_sp_nexthop4_ipip_type(mlxsw_sp, fi->fib_nh, NULL);

	const struct fib_nh *nh = fib_info_nh(fi, 0);



	return nh->fib_nh_scope == RT_SCOPE_LINK ||

	       mlxsw_sp_nexthop4_ipip_type(mlxsw_sp, nh, NULL);

}



static struct mlxsw_sp_nexthop_group *

mlxsw_sp_nexthop4_group_create(struct mlxsw_sp *mlxsw_sp, struct fib_info *fi)

{

	unsigned int nhs = fib_info_num_path(fi);

	struct mlxsw_sp_nexthop_group *nh_grp;

	struct mlxsw_sp_nexthop *nh;

	struct fib_nh *fib_nh;

	int i;

	int err;



	nh_grp = kzalloc(struct_size(nh_grp, nexthops, fi->fib_nhs),

			 GFP_KERNEL);

	nh_grp = kzalloc(struct_size(nh_grp, nexthops, nhs), GFP_KERNEL);

	if (!nh_grp)

		return ERR_PTR(-ENOMEM);

	nh_grp->priv = fi;
@@ -3840,11 +3843,11 @@ mlxsw_sp_nexthop4_group_create(struct mlxsw_sp *mlxsw_sp, struct fib_info *fi) 
	nh_grp->neigh_tbl = &arp_tbl;



	nh_grp->gateway = mlxsw_sp_fi_is_gateway(mlxsw_sp, fi);

	nh_grp->count = fi->fib_nhs;

	nh_grp->count = nhs;

	fib_info_hold(fi);

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

		nh = &nh_grp->nexthops[i];

		fib_nh = &fi->fib_nh[i];

		fib_nh = fib_info_nh(fi, i);

		err = mlxsw_sp_nexthop4_init(mlxsw_sp, nh_grp, nh, fib_nh);

		if (err)

			goto err_nexthop4_init;
@@ -4282,9 +4285,9 @@ mlxsw_sp_fib4_entry_type_set(struct mlxsw_sp *mlxsw_sp, 
			     const struct fib_entry_notifier_info *fen_info,

			     struct mlxsw_sp_fib_entry *fib_entry)

{

	struct net_device *dev = fib_info_nh(fen_info->fi, 0)->fib_nh_dev;

	union mlxsw_sp_l3addr dip = { .addr4 = htonl(fen_info->dst) };

	u32 tb_id = mlxsw_sp_fix_tb_id(fen_info->tb_id);

	struct net_device *dev = fen_info->fi->fib_dev;

	struct mlxsw_sp_ipip_entry *ipip_entry;

	struct fib_info *fi = fen_info->fi;

drivers/net/ethernet/rocker/rocker_ofdpa.c

+16 −9
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <net/neighbour.h>

#include <net/switchdev.h>

#include <net/ip_fib.h>

#include <net/nexthop.h>

#include <net/arp.h>



#include "rocker.h"
@@ -2286,8 +2287,8 @@ static int ofdpa_port_fib_ipv4(struct ofdpa_port *ofdpa_port, __be32 dst, 


	/* XXX support ECMP */



	nh = fi->fib_nh;

	nh_on_port = (fi->fib_dev == ofdpa_port->dev);

	nh = fib_info_nh(fi, 0);

	nh_on_port = (nh->fib_nh_dev == ofdpa_port->dev);

	has_gw = !!nh->fib_nh_gw4;



	if (has_gw && nh_on_port) {
@@ -2737,11 +2738,13 @@ static int ofdpa_fib4_add(struct rocker *rocker, 
{

	struct ofdpa *ofdpa = rocker->wpriv;

	struct ofdpa_port *ofdpa_port;

	struct fib_nh *nh;

	int err;



	if (ofdpa->fib_aborted)

		return 0;

	ofdpa_port = ofdpa_port_dev_lower_find(fen_info->fi->fib_dev, rocker);

	nh = fib_info_nh(fen_info->fi, 0);

	ofdpa_port = ofdpa_port_dev_lower_find(nh->fib_nh_dev, rocker);

	if (!ofdpa_port)

		return 0;

	err = ofdpa_port_fib_ipv4(ofdpa_port, htonl(fen_info->dst),
@@ -2749,7 +2752,7 @@ static int ofdpa_fib4_add(struct rocker *rocker, 
				  fen_info->tb_id, 0);

	if (err)

		return err;

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

	nh->fib_nh_flags |= RTNH_F_OFFLOAD;

	return 0;

}
@@ -2758,13 +2761,15 @@ static int ofdpa_fib4_del(struct rocker *rocker, 
{

	struct ofdpa *ofdpa = rocker->wpriv;

	struct ofdpa_port *ofdpa_port;

	struct fib_nh *nh;



	if (ofdpa->fib_aborted)

		return 0;

	ofdpa_port = ofdpa_port_dev_lower_find(fen_info->fi->fib_dev, rocker);

	nh = fib_info_nh(fen_info->fi, 0);

	ofdpa_port = ofdpa_port_dev_lower_find(nh->fib_nh_dev, rocker);

	if (!ofdpa_port)

		return 0;

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

	nh->fib_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);
@@ -2784,14 +2789,16 @@ static void ofdpa_fib4_abort(struct rocker *rocker) 


	spin_lock_irqsave(&ofdpa->flow_tbl_lock, flags);

	hash_for_each_safe(ofdpa->flow_tbl, bkt, tmp, flow_entry, entry) {

		struct fib_nh *nh;



		if (flow_entry->key.tbl_id !=

		    ROCKER_OF_DPA_TABLE_ID_UNICAST_ROUTING)

			continue;

		ofdpa_port = ofdpa_port_dev_lower_find(flow_entry->fi->fib_dev,

						       rocker);

		nh = fib_info_nh(flow_entry->fi, 0);

		ofdpa_port = ofdpa_port_dev_lower_find(nh->fib_nh_dev, rocker);

		if (!ofdpa_port)

			continue;

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

		nh->fib_nh_flags &= ~RTNH_F_OFFLOAD;

		ofdpa_flow_tbl_del(ofdpa_port, OFDPA_OP_FLAG_REMOVE,

				   flow_entry);

	}

include/net/ip_fib.h

+0 −6
Original line number Diff line number Diff line
@@ -153,7 +153,6 @@ struct fib_info { 
	bool			nh_updated;

	struct rcu_head		rcu;

	struct fib_nh		fib_nh[0];

#define fib_dev		fib_nh[0].fib_nh_dev

};
@@ -190,11 +189,6 @@ struct fib_result_nl { 
	int             err;

};



static inline struct fib_nh_common *fib_info_nhc(struct fib_info *fi, int nhsel)

{

	return &fi->fib_nh[nhsel].nh_common;

}



#ifdef CONFIG_IP_MULTIPLE_TABLES

#define FIB_TABLE_HASHSZ 256

#else

include/net/nexthop.h

+15 −0
Original line number Diff line number Diff line
@@ -192,4 +192,19 @@ static inline bool nexthop_is_blackhole(const struct nexthop *nh) 
	nhi = rcu_dereference_rtnl(nh->nh_info);

	return nhi->reject_nh;

}



static inline unsigned int fib_info_num_path(const struct fib_info *fi)

{

	return fi->fib_nhs;

}



static inline struct fib_nh_common *fib_info_nhc(struct fib_info *fi, int nhsel)

{

	return &fi->fib_nh[nhsel].nh_common;

}



static inline struct fib_nh *fib_info_nh(struct fib_info *fi, int nhsel)

{

	return &fi->fib_nh[nhsel];

}

#endif

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