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mlxsw: spectrum_router: Fix failure caused by double fib removal from HW

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In mlxsw we squash tables 254 and 255 together into HW. Kernel adds/dels
/32 ip to/from both 254 and 255. On del path, that causes the same
prefix being removed twice. Fix this by introducing reference counting
for private mlxsw fib entries. That required a bit of code reshuffle.
Also put dev into fib entry key so the same prefix could be represented
once per every router interface.

Fixes: 61c503f976 ("mlxsw: spectrum_router: Implement fib4 add/del switchdev obj ops")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2016-09-01 10:37:40 +02:00 committed by David S. Miller
parent c3804289c9
commit 5b004412e2
1 changed files with 101 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

144
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
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@ -107,6 +107,7 @@ mlxsw_sp_prefix_usage_clear(struct mlxsw_sp_prefix_usage *prefix_usage,
}
struct mlxsw_sp_fib_key {
struct net_device *dev;
unsigned char addr[sizeof(struct in6_addr)];
unsigned char prefix_len;
};
@ -123,6 +124,7 @@ struct mlxsw_sp_fib_entry {
struct rhash_head ht_node;
struct mlxsw_sp_fib_key key;
enum mlxsw_sp_fib_entry_type type;
unsigned int ref_count;
u8 added:1;
u16 rif; /* used for action local */
struct mlxsw_sp_vr *vr;
@ -171,13 +173,15 @@ static void mlxsw_sp_fib_entry_remove(struct mlxsw_sp_fib *fib,
static struct mlxsw_sp_fib_entry *
mlxsw_sp_fib_entry_create(struct mlxsw_sp_fib *fib, const void *addr,
size_t addr_len, unsigned char prefix_len)
size_t addr_len, unsigned char prefix_len,
struct net_device *dev)
{
struct mlxsw_sp_fib_entry *fib_entry;
fib_entry = kzalloc(sizeof(*fib_entry), GFP_KERNEL);
if (!fib_entry)
return NULL;
fib_entry->key.dev = dev;
memcpy(fib_entry->key.addr, addr, addr_len);
fib_entry->key.prefix_len = prefix_len;
return fib_entry;
@ -190,10 +194,13 @@ static void mlxsw_sp_fib_entry_destroy(struct mlxsw_sp_fib_entry *fib_entry)
static struct mlxsw_sp_fib_entry *
mlxsw_sp_fib_entry_lookup(struct mlxsw_sp_fib *fib, const void *addr,
size_t addr_len, unsigned char prefix_len)
size_t addr_len, unsigned char prefix_len,
struct net_device *dev)
{
struct mlxsw_sp_fib_key key = {{ 0 } };
struct mlxsw_sp_fib_key key;
memset(&key, 0, sizeof(key));
key.dev = dev;
memcpy(key.addr, addr, addr_len);
key.prefix_len = prefix_len;
return rhashtable_lookup_fast(&fib->ht, &key, mlxsw_sp_fib_ht_params);
@ -1695,6 +1702,79 @@ mlxsw_sp_router_fib4_entry_fini(struct mlxsw_sp *mlxsw_sp,
mlxsw_sp_nexthop_group_put(mlxsw_sp, fib_entry);
}
static struct mlxsw_sp_fib_entry *
mlxsw_sp_fib_entry_get(struct mlxsw_sp *mlxsw_sp,
const struct switchdev_obj_ipv4_fib *fib4)
{
struct mlxsw_sp_fib_entry *fib_entry;
struct fib_info *fi = fib4->fi;
struct mlxsw_sp_vr *vr;
int err;
vr = mlxsw_sp_vr_get(mlxsw_sp, fib4->dst_len, fib4->tb_id,
MLXSW_SP_L3_PROTO_IPV4);
if (IS_ERR(vr))
return ERR_CAST(vr);
fib_entry = mlxsw_sp_fib_entry_lookup(vr->fib, &fib4->dst,
sizeof(fib4->dst),
fib4->dst_len, fi->fib_dev);
if (fib_entry) {
/* Already exists, just take a reference */
fib_entry->ref_count++;
return fib_entry;
}
fib_entry = mlxsw_sp_fib_entry_create(vr->fib, &fib4->dst,
sizeof(fib4->dst),
fib4->dst_len, fi->fib_dev);
if (!fib_entry) {
err = -ENOMEM;
goto err_fib_entry_create;
}
fib_entry->vr = vr;
fib_entry->ref_count = 1;
err = mlxsw_sp_router_fib4_entry_init(mlxsw_sp, fib4, fib_entry);
if (err)
goto err_fib4_entry_init;
return fib_entry;
err_fib4_entry_init:
mlxsw_sp_fib_entry_destroy(fib_entry);
err_fib_entry_create:
mlxsw_sp_vr_put(mlxsw_sp, vr);
return ERR_PTR(err);
}
static struct mlxsw_sp_fib_entry *
mlxsw_sp_fib_entry_find(struct mlxsw_sp *mlxsw_sp,
const struct switchdev_obj_ipv4_fib *fib4)
{
struct mlxsw_sp_vr *vr;
vr = mlxsw_sp_vr_find(mlxsw_sp, fib4->tb_id, MLXSW_SP_L3_PROTO_IPV4);
if (!vr)
return NULL;
return mlxsw_sp_fib_entry_lookup(vr->fib, &fib4->dst,
sizeof(fib4->dst), fib4->dst_len,
fib4->fi->fib_dev);
}
void mlxsw_sp_fib_entry_put(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_entry *fib_entry)
{
struct mlxsw_sp_vr *vr = fib_entry->vr;
if (--fib_entry->ref_count == 0) {
mlxsw_sp_router_fib4_entry_fini(mlxsw_sp, fib_entry);
mlxsw_sp_fib_entry_destroy(fib_entry);
}
mlxsw_sp_vr_put(mlxsw_sp, vr);
}
static int
mlxsw_sp_router_fib4_add_prepare(struct mlxsw_sp_port *mlxsw_sp_port,
const struct switchdev_obj_ipv4_fib *fib4,
@ -1703,25 +1783,11 @@ mlxsw_sp_router_fib4_add_prepare(struct mlxsw_sp_port *mlxsw_sp_port,
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
struct mlxsw_sp_router_fib4_add_info *info;
struct mlxsw_sp_fib_entry *fib_entry;
struct mlxsw_sp_vr *vr;
int err;
vr = mlxsw_sp_vr_get(mlxsw_sp, fib4->dst_len, fib4->tb_id,
MLXSW_SP_L3_PROTO_IPV4);
if (IS_ERR(vr))
return PTR_ERR(vr);
fib_entry = mlxsw_sp_fib_entry_create(vr->fib, &fib4->dst,
sizeof(fib4->dst), fib4->dst_len);
if (!fib_entry) {
err = -ENOMEM;
goto err_fib_entry_create;
}
fib_entry->vr = vr;
err = mlxsw_sp_router_fib4_entry_init(mlxsw_sp, fib4, fib_entry);
if (err)
goto err_fib4_entry_init;
fib_entry = mlxsw_sp_fib_entry_get(mlxsw_sp, fib4);
if (IS_ERR(fib_entry))
return PTR_ERR(fib_entry);
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
@ -1736,11 +1802,7 @@ mlxsw_sp_router_fib4_add_prepare(struct mlxsw_sp_port *mlxsw_sp_port,
return 0;
err_alloc_info:
mlxsw_sp_router_fib4_entry_fini(mlxsw_sp, fib_entry);
err_fib4_entry_init:
mlxsw_sp_fib_entry_destroy(fib_entry);
err_fib_entry_create:
mlxsw_sp_vr_put(mlxsw_sp, vr);
mlxsw_sp_fib_entry_put(mlxsw_sp, fib_entry);
return err;
}
@ -1759,11 +1821,14 @@ mlxsw_sp_router_fib4_add_commit(struct mlxsw_sp_port *mlxsw_sp_port,
fib_entry = info->fib_entry;
kfree(info);
if (fib_entry->ref_count != 1)
return 0;
vr = fib_entry->vr;
err = mlxsw_sp_fib_entry_insert(fib_entry->vr->fib, fib_entry);
err = mlxsw_sp_fib_entry_insert(vr->fib, fib_entry);
if (err)
goto err_fib_entry_insert;
err = mlxsw_sp_fib_entry_update(mlxsw_sp, fib_entry);
err = mlxsw_sp_fib_entry_update(mlxsw_sp_port->mlxsw_sp, fib_entry);
if (err)
goto err_fib_entry_add;
return 0;
@ -1771,9 +1836,7 @@ mlxsw_sp_router_fib4_add_commit(struct mlxsw_sp_port *mlxsw_sp_port,
err_fib_entry_add:
mlxsw_sp_fib_entry_remove(vr->fib, fib_entry);
err_fib_entry_insert:
mlxsw_sp_router_fib4_entry_fini(mlxsw_sp, fib_entry);
mlxsw_sp_fib_entry_destroy(fib_entry);
mlxsw_sp_vr_put(mlxsw_sp, vr);
mlxsw_sp_fib_entry_put(mlxsw_sp, fib_entry);
return err;
}
@ -1793,23 +1856,18 @@ int mlxsw_sp_router_fib4_del(struct mlxsw_sp_port *mlxsw_sp_port,
{
struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
struct mlxsw_sp_fib_entry *fib_entry;
struct mlxsw_sp_vr *vr;
vr = mlxsw_sp_vr_find(mlxsw_sp, fib4->tb_id, MLXSW_SP_L3_PROTO_IPV4);
if (!vr) {
dev_warn(mlxsw_sp->bus_info->dev, "Failed to find virtual router for FIB4 entry being removed.\n");
return -ENOENT;
}
fib_entry = mlxsw_sp_fib_entry_lookup(vr->fib, &fib4->dst,
sizeof(fib4->dst), fib4->dst_len);
fib_entry = mlxsw_sp_fib_entry_find(mlxsw_sp, fib4);
if (!fib_entry) {
dev_warn(mlxsw_sp->bus_info->dev, "Failed to find FIB4 entry being removed.\n");
return -ENOENT;
}
mlxsw_sp_fib_entry_del(mlxsw_sp_port->mlxsw_sp, fib_entry);
mlxsw_sp_fib_entry_remove(vr->fib, fib_entry);
mlxsw_sp_router_fib4_entry_fini(mlxsw_sp, fib_entry);
mlxsw_sp_fib_entry_destroy(fib_entry);
mlxsw_sp_vr_put(mlxsw_sp, vr);
if (fib_entry->ref_count == 1) {
mlxsw_sp_fib_entry_del(mlxsw_sp, fib_entry);
mlxsw_sp_fib_entry_remove(fib_entry->vr->fib, fib_entry);
}
mlxsw_sp_fib_entry_put(mlxsw_sp, fib_entry);
return 0;
}