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Merge branch 'mlxsw-IPv6-and-reference-counting-fixes'
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Ido Schimmel says:

====================
mlxsw: IPv6 and reference counting fixes

The first three patches fix a mismatch between the new IPv6 behavior
introduced in commit f34436a ("net/ipv6: Simplify route replace and
appending into multipath route") and mlxsw. The patches allow the driver
to support multipathing in IPv6 overlays with GRE tunnel devices. A
selftest will be submitted when net-next opens.

The last patch fixes a reference count problem of the port_vlan struct.
I plan to simplify the code in net-next, so that reference counting is
not necessary anymore.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller committed Jun 15, 2018
2 parents 41f9ba6 + 9e25826 commit eab9a2d
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Showing 3 changed files with 29 additions and 28 deletions.
48 changes: 24 additions & 24 deletions drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -4756,12 +4756,6 @@ static void mlxsw_sp_rt6_destroy(struct mlxsw_sp_rt6 *mlxsw_sp_rt6)
kfree(mlxsw_sp_rt6);
}

static bool mlxsw_sp_fib6_rt_can_mp(const struct fib6_info *rt)
{
/* RTF_CACHE routes are ignored */
return (rt->fib6_flags & (RTF_GATEWAY | RTF_ADDRCONF)) == RTF_GATEWAY;
}

static struct fib6_info *
mlxsw_sp_fib6_entry_rt(const struct mlxsw_sp_fib6_entry *fib6_entry)
{
Expand All @@ -4771,11 +4765,11 @@ mlxsw_sp_fib6_entry_rt(const struct mlxsw_sp_fib6_entry *fib6_entry)

static struct mlxsw_sp_fib6_entry *
mlxsw_sp_fib6_node_mp_entry_find(const struct mlxsw_sp_fib_node *fib_node,
const struct fib6_info *nrt, bool replace)
const struct fib6_info *nrt, bool append)
{
struct mlxsw_sp_fib6_entry *fib6_entry;

if (!mlxsw_sp_fib6_rt_can_mp(nrt) || replace)
if (!append)
return NULL;

list_for_each_entry(fib6_entry, &fib_node->entry_list, common.list) {
Expand All @@ -4790,8 +4784,7 @@ mlxsw_sp_fib6_node_mp_entry_find(const struct mlxsw_sp_fib_node *fib_node,
break;
if (rt->fib6_metric < nrt->fib6_metric)
continue;
if (rt->fib6_metric == nrt->fib6_metric &&
mlxsw_sp_fib6_rt_can_mp(rt))
if (rt->fib6_metric == nrt->fib6_metric)
return fib6_entry;
if (rt->fib6_metric > nrt->fib6_metric)
break;
Expand Down Expand Up @@ -5170,7 +5163,7 @@ static struct mlxsw_sp_fib6_entry *
mlxsw_sp_fib6_node_entry_find(const struct mlxsw_sp_fib_node *fib_node,
const struct fib6_info *nrt, bool replace)
{
struct mlxsw_sp_fib6_entry *fib6_entry, *fallback = NULL;
struct mlxsw_sp_fib6_entry *fib6_entry;

list_for_each_entry(fib6_entry, &fib_node->entry_list, common.list) {
struct fib6_info *rt = mlxsw_sp_fib6_entry_rt(fib6_entry);
Expand All @@ -5179,18 +5172,13 @@ mlxsw_sp_fib6_node_entry_find(const struct mlxsw_sp_fib_node *fib_node,
continue;
if (rt->fib6_table->tb6_id != nrt->fib6_table->tb6_id)
break;
if (replace && rt->fib6_metric == nrt->fib6_metric) {
if (mlxsw_sp_fib6_rt_can_mp(rt) ==
mlxsw_sp_fib6_rt_can_mp(nrt))
return fib6_entry;
if (mlxsw_sp_fib6_rt_can_mp(nrt))
fallback = fallback ?: fib6_entry;
}
if (replace && rt->fib6_metric == nrt->fib6_metric)
return fib6_entry;
if (rt->fib6_metric > nrt->fib6_metric)
return fallback ?: fib6_entry;
return fib6_entry;
}

return fallback;
return NULL;
}

static int
Expand Down Expand Up @@ -5316,7 +5304,8 @@ static void mlxsw_sp_fib6_entry_replace(struct mlxsw_sp *mlxsw_sp,
}

static int mlxsw_sp_router_fib6_add(struct mlxsw_sp *mlxsw_sp,
struct fib6_info *rt, bool replace)
struct fib6_info *rt, bool replace,
bool append)
{
struct mlxsw_sp_fib6_entry *fib6_entry;
struct mlxsw_sp_fib_node *fib_node;
Expand All @@ -5342,14 +5331,22 @@ static int mlxsw_sp_router_fib6_add(struct mlxsw_sp *mlxsw_sp,
/* Before creating a new entry, try to append route to an existing
* multipath entry.
*/
fib6_entry = mlxsw_sp_fib6_node_mp_entry_find(fib_node, rt, replace);
fib6_entry = mlxsw_sp_fib6_node_mp_entry_find(fib_node, rt, append);
if (fib6_entry) {
err = mlxsw_sp_fib6_entry_nexthop_add(mlxsw_sp, fib6_entry, rt);
if (err)
goto err_fib6_entry_nexthop_add;
return 0;
}

/* We received an append event, yet did not find any route to
* append to.
*/
if (WARN_ON(append)) {
err = -EINVAL;
goto err_fib6_entry_append;
}

fib6_entry = mlxsw_sp_fib6_entry_create(mlxsw_sp, fib_node, rt);
if (IS_ERR(fib6_entry)) {
err = PTR_ERR(fib6_entry);
Expand All @@ -5367,6 +5364,7 @@ static int mlxsw_sp_router_fib6_add(struct mlxsw_sp *mlxsw_sp,
err_fib6_node_entry_link:
mlxsw_sp_fib6_entry_destroy(mlxsw_sp, fib6_entry);
err_fib6_entry_create:
err_fib6_entry_append:
err_fib6_entry_nexthop_add:
mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
return err;
Expand Down Expand Up @@ -5717,7 +5715,7 @@ static void mlxsw_sp_router_fib6_event_work(struct work_struct *work)
struct mlxsw_sp_fib_event_work *fib_work =
container_of(work, struct mlxsw_sp_fib_event_work, work);
struct mlxsw_sp *mlxsw_sp = fib_work->mlxsw_sp;
bool replace;
bool replace, append;
int err;

rtnl_lock();
Expand All @@ -5728,8 +5726,10 @@ static void mlxsw_sp_router_fib6_event_work(struct work_struct *work)
case FIB_EVENT_ENTRY_APPEND: /* fall through */
case FIB_EVENT_ENTRY_ADD:
replace = fib_work->event == FIB_EVENT_ENTRY_REPLACE;
append = fib_work->event == FIB_EVENT_ENTRY_APPEND;
err = mlxsw_sp_router_fib6_add(mlxsw_sp,
fib_work->fen6_info.rt, replace);
fib_work->fen6_info.rt, replace,
append);
if (err)
mlxsw_sp_router_fib_abort(mlxsw_sp);
mlxsw_sp_rt6_release(fib_work->fen6_info.rt);
Expand Down
4 changes: 3 additions & 1 deletion drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1018,8 +1018,10 @@ mlxsw_sp_port_vlan_bridge_join(struct mlxsw_sp_port_vlan *mlxsw_sp_port_vlan,
int err;

/* No need to continue if only VLAN flags were changed */
if (mlxsw_sp_port_vlan->bridge_port)
if (mlxsw_sp_port_vlan->bridge_port) {
mlxsw_sp_port_vlan_put(mlxsw_sp_port_vlan);
return 0;
}

err = mlxsw_sp_port_vlan_fid_join(mlxsw_sp_port_vlan, bridge_port);
if (err)
Expand Down
5 changes: 2 additions & 3 deletions net/ipv6/ip6_fib.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -934,6 +934,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
{
struct fib6_info *leaf = rcu_dereference_protected(fn->leaf,
lockdep_is_held(&rt->fib6_table->tb6_lock));
enum fib_event_type event = FIB_EVENT_ENTRY_ADD;
struct fib6_info *iter = NULL, *match = NULL;
struct fib6_info __rcu **ins;
int replace = (info->nlh &&
Expand Down Expand Up @@ -1013,6 +1014,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
"Can not append to a REJECT route");
return -EINVAL;
}
event = FIB_EVENT_ENTRY_APPEND;
rt->fib6_nsiblings = match->fib6_nsiblings;
list_add_tail(&rt->fib6_siblings, &match->fib6_siblings);
match->fib6_nsiblings++;
Expand All @@ -1034,15 +1036,12 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt,
* insert node
*/
if (!replace) {
enum fib_event_type event;

if (!add)
pr_warn("NLM_F_CREATE should be set when creating new route\n");

add:
nlflags |= NLM_F_CREATE;

event = append ? FIB_EVENT_ENTRY_APPEND : FIB_EVENT_ENTRY_ADD;
err = call_fib6_entry_notifiers(info->nl_net, event, rt,
extack);
if (err)
Expand Down

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