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mlxsw: spectrum_router: Track next hops at CRIFs

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Move the list of next hops from struct mlxsw_sp_rif to mlxsw_sp_crif. The
reason is that eventually, next hops for mlxsw uppers should be offloaded
and unoffloaded on demand as a netdevice becomes an upper, or stops being
one. Currently, next hops are tracked at RIFs, but RIFs do not exist when a
netdevice is not an mlxsw uppers. CRIFs are kept track of throughout the
netdevice lifetime.

Correspondingly, track at each next hop not its RIF, but its CRIF (from
which a RIF can always be deduced).

Note that now that next hops are tracked at a CRIF, it is not necessary to
move each over to a new RIF when it is necessary to edit a RIF. Therefore
drop mlxsw_sp_nexthop_rif_migrate() and have mlxsw_sp_rif_migrate_destroy()
call mlxsw_sp_nexthop_rif_update() directly.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Danielle Ratson <danieller@nvidia.com>
Link: https://lore.kernel.org/r/e7c1c0a7dd13883b0f09aeda12c4fcf4d63a70e3.1687438411.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Petr Machata 2023-06-22 15:33:09 +02:00 committed by Jakub Kicinski
parent a285d66423
commit 9464a3d68e
1 changed files with 76 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

129
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
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@ -59,6 +59,7 @@ struct mlxsw_sp_crif {
struct mlxsw_sp_crif_key key;
struct rhash_head ht_node;
bool can_destroy;
struct list_head nexthop_list;
struct mlxsw_sp_rif *rif;
};
@ -70,7 +71,6 @@ static const struct rhashtable_params mlxsw_sp_crif_ht_params = {
struct mlxsw_sp_rif {
struct mlxsw_sp_crif *crif; /* NULL for underlay RIF */
struct list_head nexthop_list;
struct list_head neigh_list;
struct mlxsw_sp_fid *fid;
unsigned char addr[ETH_ALEN];
@ -1083,6 +1083,7 @@ static void
mlxsw_sp_crif_init(struct mlxsw_sp_crif *crif, struct net_device *dev)
{
crif->key.dev = dev;
INIT_LIST_HEAD(&crif->nexthop_list);
}
static struct mlxsw_sp_crif *
@ -1103,6 +1104,7 @@ static void mlxsw_sp_crif_free(struct mlxsw_sp_crif *crif)
if (WARN_ON(crif->rif))
return;
WARN_ON(!list_empty(&crif->nexthop_list));
kfree(crif);
}
@ -1720,17 +1722,26 @@ static void mlxsw_sp_netdevice_ipip_ol_down_event(struct mlxsw_sp *mlxsw_sp,
mlxsw_sp_ipip_entry_ol_down_event(mlxsw_sp, ipip_entry);
}
static void mlxsw_sp_nexthop_rif_migrate(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_rif *old_rif,
struct mlxsw_sp_rif *new_rif);
static void mlxsw_sp_nexthop_rif_update(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_rif *rif);
static void mlxsw_sp_rif_migrate_destroy(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_rif *old_rif,
struct mlxsw_sp_rif *new_rif,
bool migrate_nhs)
{
if (migrate_nhs)
mlxsw_sp_nexthop_rif_migrate(mlxsw_sp, old_rif, new_rif);
struct mlxsw_sp_crif *crif = old_rif->crif;
struct mlxsw_sp_crif mock_crif = {};
if (migrate_nhs)
mlxsw_sp_nexthop_rif_update(mlxsw_sp, new_rif);
/* Plant a mock CRIF so that destroying the old RIF doesn't unoffload
* our nexthops and IPIP tunnels, and doesn't sever the crif->rif link.
*/
mlxsw_sp_crif_init(&mock_crif, crif->key.dev);
old_rif->crif = &mock_crif;
mock_crif.rif = old_rif;
mlxsw_sp_rif_destroy(old_rif);
}
@ -1756,9 +1767,6 @@ mlxsw_sp_ipip_entry_ol_lb_update(struct mlxsw_sp *mlxsw_sp,
return 0;
}
static void mlxsw_sp_nexthop_rif_update(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_rif *rif);
/**
* __mlxsw_sp_ipip_entry_update_tunnel - Update offload related to IPIP entry.
* @mlxsw_sp: mlxsw_sp.
@ -2987,7 +2995,7 @@ struct mlxsw_sp_nexthop_key {
struct mlxsw_sp_nexthop {
struct list_head neigh_list_node; /* member of neigh entry list */
struct list_head rif_list_node;
struct list_head crif_list_node;
struct list_head router_list_node;
struct mlxsw_sp_nexthop_group_info *nhgi; /* pointer back to the group
* this nexthop belongs to
@ -3000,7 +3008,7 @@ struct mlxsw_sp_nexthop {
int nh_weight;
int norm_nh_weight;
int num_adj_entries;
struct mlxsw_sp_rif *rif;
struct mlxsw_sp_crif *crif;
u8 should_offload:1, /* set indicates this nexthop should be written
* to the adjacency table.
*/
@ -3023,9 +3031,9 @@ struct mlxsw_sp_nexthop {
static struct net_device *
mlxsw_sp_nexthop_dev(const struct mlxsw_sp_nexthop *nh)
{
if (nh->rif)
return mlxsw_sp_rif_dev(nh->rif);
return NULL;
if (!nh->crif)
return NULL;
return nh->crif->key.dev;
}
enum mlxsw_sp_nexthop_group_type {
@ -3050,7 +3058,11 @@ struct mlxsw_sp_nexthop_group_info {
static struct mlxsw_sp_rif *
mlxsw_sp_nhgi_rif(const struct mlxsw_sp_nexthop_group_info *nhgi)
{
return nhgi->nexthops[0].rif;
struct mlxsw_sp_crif *crif = nhgi->nexthops[0].crif;
if (!crif)
return NULL;
return crif->rif;
}
struct mlxsw_sp_nexthop_group_vr_key {
@ -3174,7 +3186,9 @@ int mlxsw_sp_nexthop_indexes(struct mlxsw_sp_nexthop *nh, u32 *p_adj_index,
struct mlxsw_sp_rif *mlxsw_sp_nexthop_rif(struct mlxsw_sp_nexthop *nh)
{
return nh->rif;
if (WARN_ON(!nh->crif))
return NULL;
return nh->crif->rif;
}
bool mlxsw_sp_nexthop_group_has_ipip(struct mlxsw_sp_nexthop *nh)
@ -3559,11 +3573,12 @@ static int __mlxsw_sp_nexthop_eth_update(struct mlxsw_sp *mlxsw_sp,
bool force, char *ratr_pl)
{
struct mlxsw_sp_neigh_entry *neigh_entry = nh->neigh_entry;
struct mlxsw_sp_rif *rif = mlxsw_sp_nexthop_rif(nh);
enum mlxsw_reg_ratr_op op;
u16 rif_index;
rif_index = nh->rif ? nh->rif->rif_index :
mlxsw_sp->router->lb_crif->rif->rif_index;
rif_index = rif ? rif->rif_index :
mlxsw_sp->router->lb_crif->rif->rif_index;
op = force ? MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY :
MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY_ON_ACTIVITY;
mlxsw_reg_ratr_pack(ratr_pl, op, true, MLXSW_REG_RATR_TYPE_ETHERNET,
@ -4181,23 +4196,23 @@ mlxsw_sp_nexthop_neigh_update(struct mlxsw_sp *mlxsw_sp,
}
}
static void mlxsw_sp_nexthop_rif_init(struct mlxsw_sp_nexthop *nh,
struct mlxsw_sp_rif *rif)
static void mlxsw_sp_nexthop_crif_init(struct mlxsw_sp_nexthop *nh,
struct mlxsw_sp_crif *crif)
{
if (nh->rif)
if (nh->crif)
return;
nh->rif = rif;
list_add(&nh->rif_list_node, &rif->nexthop_list);
nh->crif = crif;
list_add(&nh->crif_list_node, &crif->nexthop_list);
}
static void mlxsw_sp_nexthop_rif_fini(struct mlxsw_sp_nexthop *nh)
static void mlxsw_sp_nexthop_crif_fini(struct mlxsw_sp_nexthop *nh)
{
if (!nh->rif)
if (!nh->crif)
return;
list_del(&nh->rif_list_node);
nh->rif = NULL;
list_del(&nh->crif_list_node);
nh->crif = NULL;
}
static int mlxsw_sp_nexthop_neigh_init(struct mlxsw_sp *mlxsw_sp,
@ -4209,6 +4224,9 @@ static int mlxsw_sp_nexthop_neigh_init(struct mlxsw_sp *mlxsw_sp,
u8 nud_state, dead;
int err;
if (WARN_ON(!nh->crif->rif))
return 0;
if (!nh->nhgi->gateway || nh->neigh_entry)
return 0;
dev = mlxsw_sp_nexthop_dev(nh);
@ -4299,15 +4317,20 @@ static void mlxsw_sp_nexthop_ipip_init(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_nexthop *nh,
struct mlxsw_sp_ipip_entry *ipip_entry)
{
struct mlxsw_sp_crif *crif;
bool removing;
if (!nh->nhgi->gateway || nh->ipip_entry)
return;
crif = mlxsw_sp_crif_lookup(mlxsw_sp->router, ipip_entry->ol_dev);
if (WARN_ON(!crif))
return;
nh->ipip_entry = ipip_entry;
removing = !mlxsw_sp_ipip_netdev_ul_up(ipip_entry->ol_dev);
__mlxsw_sp_nexthop_neigh_update(nh, removing);
mlxsw_sp_nexthop_rif_init(nh, &ipip_entry->ol_lb->common);
mlxsw_sp_nexthop_crif_init(nh, crif);
}
static void mlxsw_sp_nexthop_ipip_fini(struct mlxsw_sp *mlxsw_sp,
@ -4339,7 +4362,7 @@ static int mlxsw_sp_nexthop_type_init(struct mlxsw_sp *mlxsw_sp,
{
const struct mlxsw_sp_ipip_ops *ipip_ops;
struct mlxsw_sp_ipip_entry *ipip_entry;
struct mlxsw_sp_rif *rif;
struct mlxsw_sp_crif *crif;
int err;
ipip_entry = mlxsw_sp_ipip_entry_find_by_ol_dev(mlxsw_sp, dev);
@ -4353,11 +4376,15 @@ static int mlxsw_sp_nexthop_type_init(struct mlxsw_sp *mlxsw_sp,
}
nh->type = MLXSW_SP_NEXTHOP_TYPE_ETH;
rif = mlxsw_sp_rif_find_by_dev(mlxsw_sp, dev);
if (!rif)
crif = mlxsw_sp_crif_lookup(mlxsw_sp->router, dev);
if (!crif)
return 0;
mlxsw_sp_nexthop_crif_init(nh, crif);
if (!crif->rif)
return 0;
mlxsw_sp_nexthop_rif_init(nh, rif);
err = mlxsw_sp_nexthop_neigh_init(mlxsw_sp, nh);
if (err)
goto err_neigh_init;
@ -4365,7 +4392,7 @@ static int mlxsw_sp_nexthop_type_init(struct mlxsw_sp *mlxsw_sp,
return 0;
err_neigh_init:
mlxsw_sp_nexthop_rif_fini(nh);
mlxsw_sp_nexthop_crif_fini(nh);
return err;
}
@ -4386,7 +4413,7 @@ static void mlxsw_sp_nexthop_type_fini(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_nexthop *nh)
{
mlxsw_sp_nexthop_type_rif_gone(mlxsw_sp, nh);
mlxsw_sp_nexthop_rif_fini(nh);
mlxsw_sp_nexthop_crif_fini(nh);
}
static int mlxsw_sp_nexthop4_init(struct mlxsw_sp *mlxsw_sp,
@ -4479,7 +4506,7 @@ static void mlxsw_sp_nexthop_rif_update(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_nexthop *nh;
bool removing;
list_for_each_entry(nh, &rif->nexthop_list, rif_list_node) {
list_for_each_entry(nh, &rif->crif->nexthop_list, crif_list_node) {
switch (nh->type) {
case MLXSW_SP_NEXTHOP_TYPE_ETH:
removing = false;
@ -4497,25 +4524,14 @@ static void mlxsw_sp_nexthop_rif_update(struct mlxsw_sp *mlxsw_sp,
}
}
static void mlxsw_sp_nexthop_rif_migrate(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_rif *old_rif,
struct mlxsw_sp_rif *new_rif)
{
struct mlxsw_sp_nexthop *nh;
list_splice_init(&old_rif->nexthop_list, &new_rif->nexthop_list);
list_for_each_entry(nh, &new_rif->nexthop_list, rif_list_node)
nh->rif = new_rif;
mlxsw_sp_nexthop_rif_update(mlxsw_sp, new_rif);
}
static void mlxsw_sp_nexthop_rif_gone_sync(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_rif *rif)
{
struct mlxsw_sp_nexthop *nh, *tmp;
list_for_each_entry_safe(nh, tmp, &rif->nexthop_list, rif_list_node) {
mlxsw_sp_nexthop_type_fini(mlxsw_sp, nh);
list_for_each_entry_safe(nh, tmp, &rif->crif->nexthop_list,
crif_list_node) {
mlxsw_sp_nexthop_type_rif_gone(mlxsw_sp, nh);
mlxsw_sp_nexthop_group_refresh(mlxsw_sp, nh->nhgi->nh_grp);
}
}
@ -4857,13 +4873,13 @@ static void mlxsw_sp_nexthop_obj_blackhole_init(struct mlxsw_sp *mlxsw_sp,
* via an egress RIF, they still need to be programmed using a
* valid RIF, so use the loopback RIF created during init.
*/
nh->rif = mlxsw_sp->router->lb_crif->rif;
nh->crif = mlxsw_sp->router->lb_crif;
}
static void mlxsw_sp_nexthop_obj_blackhole_fini(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_nexthop *nh)
{
nh->rif = NULL;
nh->crif = NULL;
nh->should_offload = 0;
}
@ -7871,6 +7887,9 @@ static int mlxsw_sp_router_rif_disable(struct mlxsw_sp *mlxsw_sp, u16 rif)
static void mlxsw_sp_router_rif_gone_sync(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_rif *rif)
{
/* Signal to nexthop cleanup that the RIF is going away. */
rif->crif->rif = NULL;
mlxsw_sp_router_rif_disable(mlxsw_sp, rif->rif_index);
mlxsw_sp_nexthop_rif_gone_sync(mlxsw_sp, rif);
mlxsw_sp_neigh_rif_gone_sync(mlxsw_sp, rif);
@ -7989,7 +8008,6 @@ static struct mlxsw_sp_rif *mlxsw_sp_rif_alloc(size_t rif_size, u16 rif_index,
if (!rif)
return NULL;
INIT_LIST_HEAD(&rif->nexthop_list);
INIT_LIST_HEAD(&rif->neigh_list);
if (l3_dev) {
ether_addr_copy(rif->addr, l3_dev->dev_addr);
@ -8008,7 +8026,6 @@ static struct mlxsw_sp_rif *mlxsw_sp_rif_alloc(size_t rif_size, u16 rif_index,
static void mlxsw_sp_rif_free(struct mlxsw_sp_rif *rif)
{
WARN_ON(!list_empty(&rif->neigh_list));
WARN_ON(!list_empty(&rif->nexthop_list));
if (rif->crif)
rif->crif->rif = NULL;
@ -9290,7 +9307,13 @@ err_netdev_insert:
static void mlxsw_sp_crif_unregister(struct mlxsw_sp_router *router,
struct mlxsw_sp_crif *crif)
{
struct mlxsw_sp_nexthop *nh, *tmp;
mlxsw_sp_crif_remove(router, crif);
list_for_each_entry_safe(nh, tmp, &crif->nexthop_list, crif_list_node)
mlxsw_sp_nexthop_type_fini(router->mlxsw_sp, nh);
if (crif->rif)
crif->can_destroy = true;
else