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Message-Id: <20210426170411.1789186-4-tobias@waldekranz.com>
Date: Mon, 26 Apr 2021 19:04:05 +0200
From: Tobias Waldekranz <tobias@...dekranz.com>
To: davem@...emloft.net, kuba@...nel.org
Cc: andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
olteanv@...il.com, roopa@...dia.com, nikolay@...dia.com,
jiri@...nulli.us, idosch@...sch.org, stephen@...workplumber.org,
netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: [RFC net-next 3/9] net: bridge: switchdev: Recycle unused hwdoms
Since hwdoms has thus far only been used for equality comparisons, the
bridge has used the simplest possible assignment policy; using a
counter to keep track of the last value handed out.
With the upcoming transmit offloading, we need to perform set
operations efficiently based on hwdoms, e.g. we want to answer
questions like "has this skb been forwarded to any port within this
hwdom?"
Move to a bitmap-based allocation scheme that recycles hwdoms once all
members leaves the bridge. This means that we can use a single
unsigned long to keep track of the hwdoms that have received an skb.
Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
net/bridge/br_if.c | 4 +-
net/bridge/br_private.h | 29 +++++++++---
net/bridge/br_switchdev.c | 94 ++++++++++++++++++++++++++-------------
3 files changed, 87 insertions(+), 40 deletions(-)
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 73fa703f8df5..adaf78e45c23 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -349,6 +349,7 @@ static void del_nbp(struct net_bridge_port *p)
nbp_backup_clear(p);
nbp_update_port_count(br);
+ nbp_switchdev_del(p);
netdev_upper_dev_unlink(dev, br->dev);
@@ -643,7 +644,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev,
if (err)
goto err5;
- err = nbp_switchdev_hwdom_set(p);
+ err = nbp_switchdev_add(p);
if (err)
goto err6;
@@ -704,6 +705,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev,
list_del_rcu(&p->list);
br_fdb_delete_by_port(br, p, 0, 1);
nbp_update_port_count(br);
+ nbp_switchdev_del(p);
err6:
netdev_upper_dev_unlink(dev, br->dev);
err5:
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 53248715f631..aba92864d285 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -29,6 +29,8 @@
#define BR_MULTICAST_DEFAULT_HASH_MAX 4096
+#define BR_HWDOM_MAX BITS_PER_LONG
+
#define BR_VERSION "2.3"
/* Control of forwarding link local multicast */
@@ -54,6 +56,8 @@ typedef struct bridge_id bridge_id;
typedef struct mac_addr mac_addr;
typedef __u16 port_id;
+typedef DECLARE_BITMAP(br_hwdom_map_t, BR_HWDOM_MAX);
+
struct bridge_id {
unsigned char prio[2];
unsigned char addr[ETH_ALEN];
@@ -472,7 +476,7 @@ struct net_bridge {
u32 auto_cnt;
#ifdef CONFIG_NET_SWITCHDEV
- int last_hwdom;
+ br_hwdom_map_t busy_hwdoms;
#endif
struct hlist_head fdb_list;
@@ -1593,7 +1597,6 @@ static inline void br_sysfs_delbr(struct net_device *dev) { return; }
/* br_switchdev.c */
#ifdef CONFIG_NET_SWITCHDEV
-int nbp_switchdev_hwdom_set(struct net_bridge_port *p);
void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb);
bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
@@ -1607,17 +1610,15 @@ void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
struct netlink_ext_ack *extack);
int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
+int nbp_switchdev_add(struct net_bridge_port *p);
+void nbp_switchdev_del(struct net_bridge_port *p);
+void br_switchdev_init(struct net_bridge *br);
static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
{
skb->offload_fwd_mark = 0;
}
#else
-static inline int nbp_switchdev_hwdom_set(struct net_bridge_port *p)
-{
- return 0;
-}
-
static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb)
{
@@ -1657,6 +1658,20 @@ br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
{
}
+
+static inline int nbp_switchdev_add(struct net_bridge_port *p)
+{
+ return 0;
+}
+
+static inline void nbp_switchdev_del(struct net_bridge_port *p)
+{
+}
+
+static inline void br_switchdev_init(struct net_bridge *br)
+{
+}
+
#endif /* CONFIG_NET_SWITCHDEV */
/* br_arp_nd_proxy.c */
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index bc085077ae71..54bd7205bfb5 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -8,38 +8,6 @@
#include "br_private.h"
-static int br_switchdev_hwdom_get(struct net_bridge *br, struct net_device *dev)
-{
- struct net_bridge_port *p;
-
- /* dev is yet to be added to the port list. */
- list_for_each_entry(p, &br->port_list, list) {
- if (netdev_port_same_parent_id(dev, p->dev))
- return p->hwdom;
- }
-
- return ++br->last_hwdom;
-}
-
-int nbp_switchdev_hwdom_set(struct net_bridge_port *p)
-{
- struct netdev_phys_item_id ppid = { };
- int err;
-
- ASSERT_RTNL();
-
- err = dev_get_port_parent_id(p->dev, &ppid, true);
- if (err) {
- if (err == -EOPNOTSUPP)
- return 0;
- return err;
- }
-
- p->hwdom = br_switchdev_hwdom_get(p->br, p->dev);
-
- return 0;
-}
-
void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb)
{
@@ -156,3 +124,65 @@ int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
return switchdev_port_obj_del(dev, &v.obj);
}
+
+static int nbp_switchdev_hwdom_set(struct net_bridge_port *joining)
+{
+ struct net_bridge *br = joining->br;
+ struct net_bridge_port *p;
+ int hwdom;
+
+ /* joining is yet to be added to the port list. */
+ list_for_each_entry(p, &br->port_list, list) {
+ if (netdev_port_same_parent_id(joining->dev, p->dev)) {
+ joining->hwdom = p->hwdom;
+ return 0;
+ }
+ }
+
+ hwdom = find_next_zero_bit(br->busy_hwdoms, BR_HWDOM_MAX, 1);
+ if (hwdom >= BR_HWDOM_MAX)
+ return -EBUSY;
+
+ set_bit(hwdom, br->busy_hwdoms);
+ joining->hwdom = hwdom;
+ return 0;
+}
+
+static void nbp_switchdev_hwdom_put(struct net_bridge_port *leaving)
+{
+ struct net_bridge *br = leaving->br;
+ struct net_bridge_port *p;
+
+ /* leaving is no longer in the port list. */
+ list_for_each_entry(p, &br->port_list, list) {
+ if (p->hwdom == leaving->hwdom)
+ return;
+ }
+
+ clear_bit(leaving->hwdom, br->busy_hwdoms);
+}
+
+int nbp_switchdev_add(struct net_bridge_port *p)
+{
+ struct netdev_phys_item_id ppid = { };
+ int err;
+
+ ASSERT_RTNL();
+
+ err = dev_get_port_parent_id(p->dev, &ppid, true);
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ return 0;
+ return err;
+ }
+
+ return nbp_switchdev_hwdom_set(p);
+}
+
+void nbp_switchdev_del(struct net_bridge_port *p)
+{
+ ASSERT_RTNL();
+
+ if (p->hwdom)
+ nbp_switchdev_hwdom_put(p);
+}
--
2.25.1
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