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mlxsw: spectrum_router: Remove FIB entry list from FIB node

Browse Source 
As explained in previous patches, the driver no longer needs to maintain
a list of identical FIB entries (i.e, same {tb_id, prefix, prefix
length}) and therefore each FIB node can only store one FIB entry.

Remove the FIB entry list and simplify the code.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-12-26 18:41:17 +02:00 committed by David S. Miller
parent b04720aee9
commit 7c4a7ec855
1 changed files with 74 additions and 151 deletions
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225
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
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@ -382,9 +382,10 @@ enum mlxsw_sp_fib_entry_type {
};
struct mlxsw_sp_nexthop_group;
struct mlxsw_sp_fib_entry;
struct mlxsw_sp_fib_node {
struct list_head entry_list;
struct mlxsw_sp_fib_entry *fib_entry;
struct list_head list;
struct rhash_head ht_node;
struct mlxsw_sp_fib *fib;
@ -397,7 +398,6 @@ struct mlxsw_sp_fib_entry_decap {
};
struct mlxsw_sp_fib_entry {
struct list_head list;
struct mlxsw_sp_fib_node *fib_node;
enum mlxsw_sp_fib_entry_type type;
struct list_head nexthop_group_node;
@ -1162,7 +1162,6 @@ mlxsw_sp_router_ip2me_fib_entry_find(struct mlxsw_sp *mlxsw_sp, u32 tb_id,
const union mlxsw_sp_l3addr *addr,
enum mlxsw_sp_fib_entry_type type)
{
struct mlxsw_sp_fib_entry *fib_entry;
struct mlxsw_sp_fib_node *fib_node;
unsigned char addr_prefix_len;
struct mlxsw_sp_fib *fib;
@ -1191,15 +1190,10 @@ mlxsw_sp_router_ip2me_fib_entry_find(struct mlxsw_sp *mlxsw_sp, u32 tb_id,
fib_node = mlxsw_sp_fib_node_lookup(fib, addrp, addr_len,
addr_prefix_len);
if (!fib_node || list_empty(&fib_node->entry_list))
if (!fib_node || fib_node->fib_entry->type != type)
return NULL;
fib_entry = list_first_entry(&fib_node->entry_list,
struct mlxsw_sp_fib_entry, list);
if (fib_entry->type != type)
return NULL;
return fib_entry;
return fib_node->fib_entry;
}
/* Given an IPIP entry, find the corresponding decap route. */
@ -1209,7 +1203,6 @@ mlxsw_sp_ipip_entry_find_decap(struct mlxsw_sp *mlxsw_sp,
{
static struct mlxsw_sp_fib_node *fib_node;
const struct mlxsw_sp_ipip_ops *ipip_ops;
struct mlxsw_sp_fib_entry *fib_entry;
unsigned char saddr_prefix_len;
union mlxsw_sp_l3addr saddr;
struct mlxsw_sp_fib *ul_fib;
@ -1244,15 +1237,11 @@ mlxsw_sp_ipip_entry_find_decap(struct mlxsw_sp *mlxsw_sp,
fib_node = mlxsw_sp_fib_node_lookup(ul_fib, saddrp, saddr_len,
saddr_prefix_len);
if (!fib_node || list_empty(&fib_node->entry_list))
if (!fib_node ||
fib_node->fib_entry->type != MLXSW_SP_FIB_ENTRY_TYPE_TRAP)
return NULL;
fib_entry = list_first_entry(&fib_node->entry_list,
struct mlxsw_sp_fib_entry, list);
if (fib_entry->type != MLXSW_SP_FIB_ENTRY_TYPE_TRAP)
return NULL;
return fib_entry;
return fib_node->fib_entry;
}
static struct mlxsw_sp_ipip_entry *
@ -4559,15 +4548,14 @@ mlxsw_sp_fib4_entry_lookup(struct mlxsw_sp *mlxsw_sp,
if (!fib_node)
return NULL;
list_for_each_entry(fib4_entry, &fib_node->entry_list, common.list) {
if (fib4_entry->tb_id == fen_info->tb_id &&
fib4_entry->tos == fen_info->tos &&
fib4_entry->type == fen_info->type &&
mlxsw_sp_nexthop4_group_fi(fib4_entry->common.nh_group) ==
fen_info->fi) {
return fib4_entry;
}
}
fib4_entry = container_of(fib_node->fib_entry,
struct mlxsw_sp_fib4_entry, common);
if (fib4_entry->tb_id == fen_info->tb_id &&
fib4_entry->tos == fen_info->tos &&
fib4_entry->type == fen_info->type &&
mlxsw_sp_nexthop4_group_fi(fib4_entry->common.nh_group) ==
fen_info->fi)
return fib4_entry;
return NULL;
}
@ -4615,7 +4603,6 @@ mlxsw_sp_fib_node_create(struct mlxsw_sp_fib *fib, const void *addr,
if (!fib_node)
return NULL;
INIT_LIST_HEAD(&fib_node->entry_list);
list_add(&fib_node->list, &fib->node_list);
memcpy(fib_node->key.addr, addr, addr_len);
fib_node->key.prefix_len = prefix_len;
@ -4626,18 +4613,9 @@ mlxsw_sp_fib_node_create(struct mlxsw_sp_fib *fib, const void *addr,
static void mlxsw_sp_fib_node_destroy(struct mlxsw_sp_fib_node *fib_node)
{
list_del(&fib_node->list);
WARN_ON(!list_empty(&fib_node->entry_list));
kfree(fib_node);
}
static bool
mlxsw_sp_fib_node_entry_is_first(const struct mlxsw_sp_fib_node *fib_node,
const struct mlxsw_sp_fib_entry *fib_entry)
{
return list_first_entry(&fib_node->entry_list,
struct mlxsw_sp_fib_entry, list) == fib_entry;
}
static int mlxsw_sp_fib_lpm_tree_link(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_node *fib_node)
{
@ -4777,58 +4755,29 @@ static void mlxsw_sp_fib_node_put(struct mlxsw_sp *mlxsw_sp,
{
struct mlxsw_sp_vr *vr = fib_node->fib->vr;
if (!list_empty(&fib_node->entry_list))
if (fib_node->fib_entry)
return;
mlxsw_sp_fib_node_fini(mlxsw_sp, fib_node);
mlxsw_sp_fib_node_destroy(fib_node);
mlxsw_sp_vr_put(mlxsw_sp, vr);
}
static int mlxsw_sp_fib_node_entry_add(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_entry *fib_entry)
{
struct mlxsw_sp_fib_node *fib_node = fib_entry->fib_node;
/* To prevent packet loss, overwrite the previously offloaded
* entry.
*/
if (!list_is_singular(&fib_node->entry_list)) {
enum mlxsw_reg_ralue_op op = MLXSW_REG_RALUE_OP_WRITE_DELETE;
struct mlxsw_sp_fib_entry *n = list_next_entry(fib_entry, list);
mlxsw_sp_fib_entry_offload_refresh(n, op, 0);
}
return mlxsw_sp_fib_entry_update(mlxsw_sp, fib_entry);
}
static void mlxsw_sp_fib_node_entry_del(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_entry *fib_entry)
{
struct mlxsw_sp_fib_node *fib_node = fib_entry->fib_node;
if (!mlxsw_sp_fib_node_entry_is_first(fib_node, fib_entry))
return;
mlxsw_sp_fib_entry_del(mlxsw_sp, fib_entry);
}
static int mlxsw_sp_fib_node_entry_link(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_entry *fib_entry)
{
struct mlxsw_sp_fib_node *fib_node = fib_entry->fib_node;
int err;
list_add(&fib_entry->list, &fib_node->entry_list);
fib_node->fib_entry = fib_entry;
err = mlxsw_sp_fib_node_entry_add(mlxsw_sp, fib_entry);
err = mlxsw_sp_fib_entry_update(mlxsw_sp, fib_entry);
if (err)
goto err_fib_node_entry_add;
goto err_fib_entry_update;
return 0;
err_fib_node_entry_add:
list_del(&fib_entry->list);
err_fib_entry_update:
fib_node->fib_entry = NULL;
return err;
}
@ -4836,32 +4785,18 @@ static void
mlxsw_sp_fib_node_entry_unlink(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_entry *fib_entry)
{
mlxsw_sp_fib_node_entry_del(mlxsw_sp, fib_entry);
list_del(&fib_entry->list);
}
struct mlxsw_sp_fib_node *fib_node = fib_entry->fib_node;
static void mlxsw_sp_fib4_entry_replace(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib4_entry *fib4_entry)
{
struct mlxsw_sp_fib_node *fib_node = fib4_entry->common.fib_node;
struct mlxsw_sp_fib4_entry *replaced;
if (list_is_singular(&fib_node->entry_list))
return;
/* We inserted the new entry before replaced one */
replaced = list_next_entry(fib4_entry, common.list);
mlxsw_sp_fib_node_entry_unlink(mlxsw_sp, &replaced->common);
mlxsw_sp_fib4_entry_destroy(mlxsw_sp, replaced);
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
mlxsw_sp_fib_entry_del(mlxsw_sp, fib_entry);
fib_node->fib_entry = NULL;
}
static int
mlxsw_sp_router_fib4_replace(struct mlxsw_sp *mlxsw_sp,
const struct fib_entry_notifier_info *fen_info)
{
struct mlxsw_sp_fib4_entry *fib4_entry;
struct mlxsw_sp_fib4_entry *fib4_entry, *fib4_replaced;
struct mlxsw_sp_fib_entry *replaced;
struct mlxsw_sp_fib_node *fib_node;
int err;
@ -4884,17 +4819,26 @@ mlxsw_sp_router_fib4_replace(struct mlxsw_sp *mlxsw_sp,
goto err_fib4_entry_create;
}
replaced = fib_node->fib_entry;
err = mlxsw_sp_fib_node_entry_link(mlxsw_sp, &fib4_entry->common);
if (err) {
dev_warn(mlxsw_sp->bus_info->dev, "Failed to link FIB entry to node\n");
goto err_fib_node_entry_link;
}
mlxsw_sp_fib4_entry_replace(mlxsw_sp, fib4_entry);
/* Nothing to replace */
if (!replaced)
return 0;
mlxsw_sp_fib_entry_offload_unset(replaced);
fib4_replaced = container_of(replaced, struct mlxsw_sp_fib4_entry,
common);
mlxsw_sp_fib4_entry_destroy(mlxsw_sp, fib4_replaced);
return 0;
err_fib_node_entry_link:
fib_node->fib_entry = replaced;
mlxsw_sp_fib4_entry_destroy(mlxsw_sp, fib4_entry);
err_fib4_entry_create:
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
@ -5201,16 +5145,16 @@ mlxsw_sp_nexthop6_group_update(struct mlxsw_sp *mlxsw_sp,
* currently associated with it in the device's table is that
* of the old group. Start using the new one instead.
*/
err = mlxsw_sp_fib_node_entry_add(mlxsw_sp, &fib6_entry->common);
err = mlxsw_sp_fib_entry_update(mlxsw_sp, &fib6_entry->common);
if (err)
goto err_fib_node_entry_add;
goto err_fib_entry_update;
if (list_empty(&old_nh_grp->fib_list))
mlxsw_sp_nexthop6_group_destroy(mlxsw_sp, old_nh_grp);
return 0;
err_fib_node_entry_add:
err_fib_entry_update:
mlxsw_sp_nexthop6_group_put(mlxsw_sp, &fib6_entry->common);
err_nexthop6_group_get:
list_add_tail(&fib6_entry->common.nexthop_group_node,
@ -5381,6 +5325,7 @@ mlxsw_sp_fib6_entry_lookup(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib6_entry *fib6_entry;
struct mlxsw_sp_fib_node *fib_node;
struct mlxsw_sp_fib *fib;
struct fib6_info *cmp_rt;
struct mlxsw_sp_vr *vr;
vr = mlxsw_sp_vr_find(mlxsw_sp, rt->fib6_table->tb6_id);
@ -5394,40 +5339,23 @@ mlxsw_sp_fib6_entry_lookup(struct mlxsw_sp *mlxsw_sp,
if (!fib_node)
return NULL;
list_for_each_entry(fib6_entry, &fib_node->entry_list, common.list) {
struct fib6_info *iter_rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
if (rt->fib6_table->tb6_id == iter_rt->fib6_table->tb6_id &&
rt->fib6_metric == iter_rt->fib6_metric &&
mlxsw_sp_fib6_entry_rt_find(fib6_entry, rt))
return fib6_entry;
}
fib6_entry = container_of(fib_node->fib_entry,
struct mlxsw_sp_fib6_entry, common);
cmp_rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
if (rt->fib6_table->tb6_id == cmp_rt->fib6_table->tb6_id &&
rt->fib6_metric == cmp_rt->fib6_metric &&
mlxsw_sp_fib6_entry_rt_find(fib6_entry, rt))
return fib6_entry;
return NULL;
}
static void mlxsw_sp_fib6_entry_replace(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib6_entry *fib6_entry)
{
struct mlxsw_sp_fib_node *fib_node = fib6_entry->common.fib_node;
struct mlxsw_sp_fib6_entry *replaced;
if (list_is_singular(&fib_node->entry_list))
return;
/* We inserted the new entry before replaced one */
replaced = list_next_entry(fib6_entry, common.list);
mlxsw_sp_fib_node_entry_unlink(mlxsw_sp, &replaced->common);
mlxsw_sp_fib6_entry_destroy(mlxsw_sp, replaced);
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
}
static int mlxsw_sp_router_fib6_replace(struct mlxsw_sp *mlxsw_sp,
struct fib6_info **rt_arr,
unsigned int nrt6)
{
struct mlxsw_sp_fib6_entry *fib6_entry;
struct mlxsw_sp_fib6_entry *fib6_entry, *fib6_replaced;
struct mlxsw_sp_fib_entry *replaced;
struct mlxsw_sp_fib_node *fib_node;
struct fib6_info *rt = rt_arr[0];
int err;
@ -5456,15 +5384,24 @@ static int mlxsw_sp_router_fib6_replace(struct mlxsw_sp *mlxsw_sp,
goto err_fib6_entry_create;
}
replaced = fib_node->fib_entry;
err = mlxsw_sp_fib_node_entry_link(mlxsw_sp, &fib6_entry->common);
if (err)
goto err_fib_node_entry_link;
mlxsw_sp_fib6_entry_replace(mlxsw_sp, fib6_entry);
/* Nothing to replace */
if (!replaced)
return 0;
mlxsw_sp_fib_entry_offload_unset(replaced);
fib6_replaced = container_of(replaced, struct mlxsw_sp_fib6_entry,
common);
mlxsw_sp_fib6_entry_destroy(mlxsw_sp, fib6_replaced);
return 0;
err_fib_node_entry_link:
fib_node->fib_entry = replaced;
mlxsw_sp_fib6_entry_destroy(mlxsw_sp, fib6_entry);
err_fib6_entry_create:
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
@ -5497,13 +5434,13 @@ static int mlxsw_sp_router_fib6_append(struct mlxsw_sp *mlxsw_sp,
if (IS_ERR(fib_node))
return PTR_ERR(fib_node);
if (WARN_ON_ONCE(list_empty(&fib_node->entry_list))) {
if (WARN_ON_ONCE(!fib_node->fib_entry)) {
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
return -EINVAL;
}
fib6_entry = list_first_entry(&fib_node->entry_list,
struct mlxsw_sp_fib6_entry, common.list);
fib6_entry = container_of(fib_node->fib_entry,
struct mlxsw_sp_fib6_entry, common);
err = mlxsw_sp_fib6_entry_nexthop_add(mlxsw_sp, fib6_entry, rt_arr,
nrt6);
if (err)
@ -5704,39 +5641,25 @@ static int mlxsw_sp_router_set_abort_trap(struct mlxsw_sp *mlxsw_sp)
static void mlxsw_sp_fib4_node_flush(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_node *fib_node)
{
struct mlxsw_sp_fib4_entry *fib4_entry, *tmp;
struct mlxsw_sp_fib4_entry *fib4_entry;
list_for_each_entry_safe(fib4_entry, tmp, &fib_node->entry_list,
common.list) {
bool do_break = &tmp->common.list == &fib_node->entry_list;
mlxsw_sp_fib_node_entry_unlink(mlxsw_sp, &fib4_entry->common);
mlxsw_sp_fib4_entry_destroy(mlxsw_sp, fib4_entry);
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
/* Break when entry list is empty and node was freed.
* Otherwise, we'll access freed memory in the next
* iteration.
*/
if (do_break)
break;
}
fib4_entry = container_of(fib_node->fib_entry,
struct mlxsw_sp_fib4_entry, common);
mlxsw_sp_fib_node_entry_unlink(mlxsw_sp, fib_node->fib_entry);
mlxsw_sp_fib4_entry_destroy(mlxsw_sp, fib4_entry);
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
}
static void mlxsw_sp_fib6_node_flush(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_fib_node *fib_node)
{
struct mlxsw_sp_fib6_entry *fib6_entry, *tmp;
struct mlxsw_sp_fib6_entry *fib6_entry;
list_for_each_entry_safe(fib6_entry, tmp, &fib_node->entry_list,
common.list) {
bool do_break = &tmp->common.list == &fib_node->entry_list;
mlxsw_sp_fib_node_entry_unlink(mlxsw_sp, &fib6_entry->common);
mlxsw_sp_fib6_entry_destroy(mlxsw_sp, fib6_entry);
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
if (do_break)
break;
}
fib6_entry = container_of(fib_node->fib_entry,
struct mlxsw_sp_fib6_entry, common);
mlxsw_sp_fib_node_entry_unlink(mlxsw_sp, fib_node->fib_entry);
mlxsw_sp_fib6_entry_destroy(mlxsw_sp, fib6_entry);
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
}
static void mlxsw_sp_fib_node_flush(struct mlxsw_sp *mlxsw_sp,