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Date: Sat, 30 Mar 2013 16:57:14 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, edumazet@...gle.com, fubar@...ibm.com,
andy@...yhouse.net, kaber@...sh.net, stephen@...workplumber.org,
jesse@...ira.com, alexander.h.duyck@...el.com,
xiyou.wangcong@...il.com, dev@...nvswitch.org, rostedt@...dmis.org,
nicolas.2p.debian@...il.com, tglx@...utronix.de,
streeter@...hat.com, paulmck@...ibm.com, ivecera@...hat.com
Subject: [patch net-next] net: squash ->rx_handler and ->rx_handler_data into single rcu pointer
No need to have two pointers in struct netdevice for rx_handler func and
priv data. Just embed rx_handler structure into driver port_priv and
have ->func pointer there. This introduces no performance penalty,
reduces struct netdevice by one pointer and reduces number of needed
rcu_dereference calls from 2 to 1.
Note this also fixes the race bug pointed out by Steven Rostedt and
fixed by patch "[PATCH] net: add a synchronize_net() in
netdev_rx_handler_unregister()" by Eric Dumazet. This is based on
current net-next tree where the patch is not applied yet.
I can rebase it on whatever tree/state, just say so.
Smoke tested with all drivers who use rx_handler.
Reported-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
drivers/net/bonding/bond_main.c | 9 +++++----
drivers/net/bonding/bonding.h | 16 +++++++++++-----
drivers/net/macvlan.c | 30 +++++++++++++++++++++---------
drivers/net/team/team.c | 22 +++++++++++-----------
include/linux/if_team.h | 1 +
include/linux/netdevice.h | 17 ++++++++++++-----
net/bridge/br_if.c | 3 ++-
net/bridge/br_input.c | 5 +++--
net/bridge/br_private.h | 26 ++++++++++++++++++--------
net/core/dev.c | 24 +++++++++++++++++-------
net/openvswitch/dp_notify.c | 2 +-
net/openvswitch/vport-netdev.c | 22 +++++-----------------
net/openvswitch/vport-netdev.h | 16 +++++++++++++++-
net/openvswitch/vport.h | 2 ++
14 files changed, 124 insertions(+), 71 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 11a8cb3..03e9895 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1440,7 +1440,8 @@ static bool bond_should_deliver_exact_match(struct sk_buff *skb,
return false;
}
-static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
+static rx_handler_result_t
+bond_handle_frame(struct sk_buff **pskb, struct netdev_rx_handler *rx_handler)
{
struct sk_buff *skb = *pskb;
struct slave *slave;
@@ -1455,7 +1456,7 @@ static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
*pskb = skb;
- slave = bond_slave_get_rcu(skb->dev);
+ slave = bond_slave_get_by_rx_handler(rx_handler);
bond = slave->bond;
if (bond->params.arp_interval)
@@ -1880,8 +1881,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
if (res)
goto err_detach;
- res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
- new_slave);
+ netdev_rx_handler_init(&new_slave->rx_handler, bond_handle_frame);
+ res = netdev_rx_handler_register(slave_dev, &new_slave->rx_handler);
if (res) {
pr_debug("Error %d calling netdev_rx_handler_register\n", res);
goto err_dest_symlinks;
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 2baec24..cd3ccb4 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -172,7 +172,8 @@ struct vlan_entry {
};
struct slave {
- struct net_device *dev; /* first - useful for panic debug */
+ struct netdev_rx_handler rx_handler;
+ struct net_device *dev;
struct slave *next;
struct slave *prev;
struct bonding *bond; /* our master */
@@ -256,11 +257,16 @@ static inline bool bond_vlan_used(struct bonding *bond)
return !list_empty(&bond->vlan_list);
}
-#define bond_slave_get_rcu(dev) \
- ((struct slave *) rcu_dereference(dev->rx_handler_data))
+static inline struct slave *
+bond_slave_get_by_rx_handler(const struct netdev_rx_handler *rx_handler)
+{
+ return container_of(rx_handler, struct slave, rx_handler);
+}
-#define bond_slave_get_rtnl(dev) \
- ((struct slave *) rtnl_dereference(dev->rx_handler_data))
+static inline struct slave *bond_slave_get_rtnl(const struct net_device *dev)
+{
+ return bond_slave_get_by_rx_handler(rtnl_dereference(dev->rx_handler));
+}
/**
* Returns NULL if the net_device does not belong to any of the bond's slaves
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 73abbc1..9a065e4 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -36,6 +36,7 @@
#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
struct macvlan_port {
+ struct netdev_rx_handler rx_handler;
struct net_device *dev;
struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
struct list_head vlans;
@@ -46,9 +47,17 @@ struct macvlan_port {
static void macvlan_port_destroy(struct net_device *dev);
-#define macvlan_port_get_rcu(dev) \
- ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
-#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
+static struct macvlan_port *
+macvlan_port_get_by_rx_handler(const struct netdev_rx_handler *rx_handler)
+{
+ return container_of(rx_handler, struct macvlan_port, rx_handler);
+}
+
+static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
+{
+ return macvlan_port_get_by_rx_handler(rtnl_dereference(dev->rx_handler));
+}
+
#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
@@ -174,7 +183,9 @@ static void macvlan_broadcast(struct sk_buff *skb,
}
/* called under rcu_read_lock() from netif_receive_skb */
-static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
+static rx_handler_result_t
+macvlan_handle_frame(struct sk_buff **pskb,
+ struct netdev_rx_handler *rx_handler)
{
struct macvlan_port *port;
struct sk_buff *skb = *pskb;
@@ -185,7 +196,7 @@ static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
unsigned int len = 0;
int ret = NET_RX_DROP;
- port = macvlan_port_get_rcu(skb->dev);
+ port = macvlan_port_get_by_rx_handler(rx_handler);
if (is_multicast_ether_addr(eth->h_dest)) {
skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
if (!skb)
@@ -693,7 +704,8 @@ static int macvlan_port_create(struct net_device *dev)
for (i = 0; i < MACVLAN_HASH_SIZE; i++)
INIT_HLIST_HEAD(&port->vlan_hash[i]);
- err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
+ netdev_rx_handler_init(&port->rx_handler, macvlan_handle_frame);
+ err = netdev_rx_handler_register(dev, &port->rx_handler);
if (err)
kfree(port);
else
@@ -703,7 +715,7 @@ static int macvlan_port_create(struct net_device *dev)
static void macvlan_port_destroy(struct net_device *dev)
{
- struct macvlan_port *port = macvlan_port_get(dev);
+ struct macvlan_port *port = macvlan_port_get_rtnl(dev);
dev->priv_flags &= ~IFF_MACVLAN_PORT;
netdev_rx_handler_unregister(dev);
@@ -772,7 +784,7 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
if (err < 0)
return err;
}
- port = macvlan_port_get(lowerdev);
+ port = macvlan_port_get_rtnl(lowerdev);
/* Only 1 macvlan device can be created in passthru mode */
if (port->passthru)
@@ -921,7 +933,7 @@ static int macvlan_device_event(struct notifier_block *unused,
if (!macvlan_port_exists(dev))
return NOTIFY_DONE;
- port = macvlan_port_get(dev);
+ port = macvlan_port_get_rtnl(dev);
switch (event) {
case NETDEV_CHANGE:
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 621c1bd..86dcbf1 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -40,18 +40,17 @@
#define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT)
-static struct team_port *team_port_get_rcu(const struct net_device *dev)
+static struct team_port *
+team_port_get_by_rx_handler(const struct netdev_rx_handler *rx_handler)
{
- struct team_port *port = rcu_dereference(dev->rx_handler_data);
-
- return team_port_exists(dev) ? port : NULL;
+ return container_of(rx_handler, struct team_port, rx_handler);
}
static struct team_port *team_port_get_rtnl(const struct net_device *dev)
{
- struct team_port *port = rtnl_dereference(dev->rx_handler_data);
-
- return team_port_exists(dev) ? port : NULL;
+ if (!team_port_exists(dev))
+ return NULL;
+ return team_port_get_by_rx_handler(rtnl_dereference(dev->rx_handler));
}
/*
@@ -632,7 +631,8 @@ static int team_change_mode(struct team *team, const char *kind)
************************/
/* note: already called with rcu_read_lock */
-static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
+static rx_handler_result_t
+team_handle_frame(struct sk_buff **pskb, struct netdev_rx_handler *rx_handler)
{
struct sk_buff *skb = *pskb;
struct team_port *port;
@@ -645,7 +645,7 @@ static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
*pskb = skb;
- port = team_port_get_rcu(skb->dev);
+ port = team_port_get_by_rx_handler(rx_handler);
team = port->team;
if (!team_port_enabled(port)) {
/* allow exact match delivery for disabled ports */
@@ -1076,8 +1076,8 @@ static int team_port_add(struct team *team, struct net_device *port_dev)
goto err_set_upper_link;
}
- err = netdev_rx_handler_register(port_dev, team_handle_frame,
- port);
+ netdev_rx_handler_init(&port->rx_handler, team_handle_frame);
+ err = netdev_rx_handler_register(port_dev, &port->rx_handler);
if (err) {
netdev_err(dev, "Device %s failed to register rx_handler\n",
portname);
diff --git a/include/linux/if_team.h b/include/linux/if_team.h
index 4474557..72fd12e 100644
--- a/include/linux/if_team.h
+++ b/include/linux/if_team.h
@@ -29,6 +29,7 @@ struct team_pcpu_stats {
struct team;
struct team_port {
+ struct netdev_rx_handler rx_handler;
struct net_device *dev;
struct hlist_node hlist; /* node in enabled ports hash list */
struct list_head list; /* node in ordinary list */
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1dbb02c..738226e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -387,8 +387,15 @@ enum rx_handler_result {
RX_HANDLER_EXACT,
RX_HANDLER_PASS,
};
+
typedef enum rx_handler_result rx_handler_result_t;
-typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
+struct netdev_rx_handler;
+typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb,
+ struct netdev_rx_handler *rx_handler);
+
+struct netdev_rx_handler {
+ rx_handler_func_t *func;
+};
extern void __napi_schedule(struct napi_struct *n);
@@ -1208,8 +1215,7 @@ struct net_device {
#endif
#endif
- rx_handler_func_t __rcu *rx_handler;
- void __rcu *rx_handler_data;
+ struct netdev_rx_handler __rcu *rx_handler;
struct netdev_queue __rcu *ingress_queue;
@@ -2212,9 +2218,10 @@ static inline void napi_free_frags(struct napi_struct *napi)
napi->skb = NULL;
}
+extern void netdev_rx_handler_init(struct netdev_rx_handler *rx_handler,
+ rx_handler_func_t *func);
extern int netdev_rx_handler_register(struct net_device *dev,
- rx_handler_func_t *rx_handler,
- void *rx_handler_data);
+ struct netdev_rx_handler *rx_handler);
extern void netdev_rx_handler_unregister(struct net_device *dev);
extern bool dev_valid_name(const char *name);
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index ef1b914..f855c07 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -370,7 +370,8 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
if (err)
goto err4;
- err = netdev_rx_handler_register(dev, br_handle_frame, p);
+ netdev_rx_handler_init(&p->rx_handler, br_handle_frame);
+ err = netdev_rx_handler_register(dev, &p->rx_handler);
if (err)
goto err5;
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 828e2bc..a8bc5a6 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -150,7 +150,8 @@ static int br_handle_local_finish(struct sk_buff *skb)
* Return NULL if skb is handled
* note: already called with rcu_read_lock
*/
-rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
+rx_handler_result_t br_handle_frame(struct sk_buff **pskb,
+ struct netdev_rx_handler *rx_handler)
{
struct net_bridge_port *p;
struct sk_buff *skb = *pskb;
@@ -167,7 +168,7 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
if (!skb)
return RX_HANDLER_CONSUMED;
- p = br_port_get_rcu(skb->dev);
+ p = br_port_get_by_rx_handler(rx_handler);
if (unlikely(is_link_local_ether_addr(dest))) {
/*
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 3cbf5be..727cc51 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -127,6 +127,7 @@ struct net_bridge_mdb_htable
struct net_bridge_port
{
+ struct netdev_rx_handler rx_handler;
struct net_bridge *br;
struct net_device *dev;
struct list_head list;
@@ -180,18 +181,26 @@ struct net_bridge_port
#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
-static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
+static inline struct net_bridge_port *
+br_port_get_by_rx_handler(const struct netdev_rx_handler *rx_handler)
{
- struct net_bridge_port *port =
- rcu_dereference_rtnl(dev->rx_handler_data);
+ return container_of(rx_handler, struct net_bridge_port, rx_handler);
+}
- return br_port_exists(dev) ? port : NULL;
+static inline struct net_bridge_port *
+br_port_get_rcu(const struct net_device *dev)
+{
+ if (!br_port_exists(dev))
+ return NULL;
+ return br_port_get_by_rx_handler(rcu_dereference_rtnl(dev->rx_handler));
}
-static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
+static inline struct net_bridge_port *
+br_port_get_rtnl(const struct net_device *dev)
{
- return br_port_exists(dev) ?
- rtnl_dereference(dev->rx_handler_data) : NULL;
+ if (!br_port_exists(dev))
+ return NULL;
+ return br_port_get_by_rx_handler(rtnl_dereference(dev->rx_handler));
}
struct br_cpu_netstats {
@@ -429,7 +438,8 @@ extern netdev_features_t br_features_recompute(struct net_bridge *br,
/* br_input.c */
extern int br_handle_frame_finish(struct sk_buff *skb);
-extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
+extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb,
+ struct netdev_rx_handler *rx_handler);
/* br_ioctl.c */
extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
diff --git a/net/core/dev.c b/net/core/dev.c
index 2db88df..88e839c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3296,10 +3296,23 @@ out:
#endif
/**
+ * netdev_rx_handler_init - init receive handler structure
+ * @rx_handler: receive handler to init
+ * @func: receive handler function
+ *
+ * Inits receive handler structure.
+ */
+void netdev_rx_handler_init(struct netdev_rx_handler *rx_handler,
+ rx_handler_func_t *func)
+{
+ rx_handler->func = func;
+}
+EXPORT_SYMBOL_GPL(netdev_rx_handler_init);
+
+/**
* netdev_rx_handler_register - register receive handler
* @dev: device to register a handler for
* @rx_handler: receive handler to register
- * @rx_handler_data: data pointer that is used by rx handler
*
* Register a receive hander for a device. This handler will then be
* called from __netif_receive_skb. A negative errno code is returned
@@ -3310,15 +3323,13 @@ out:
* For a general description of rx_handler, see enum rx_handler_result.
*/
int netdev_rx_handler_register(struct net_device *dev,
- rx_handler_func_t *rx_handler,
- void *rx_handler_data)
+ struct netdev_rx_handler *rx_handler)
{
ASSERT_RTNL();
if (dev->rx_handler)
return -EBUSY;
- rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
rcu_assign_pointer(dev->rx_handler, rx_handler);
return 0;
@@ -3338,7 +3349,6 @@ void netdev_rx_handler_unregister(struct net_device *dev)
ASSERT_RTNL();
RCU_INIT_POINTER(dev->rx_handler, NULL);
- RCU_INIT_POINTER(dev->rx_handler_data, NULL);
}
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
@@ -3362,7 +3372,7 @@ static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
{
struct packet_type *ptype, *pt_prev;
- rx_handler_func_t *rx_handler;
+ struct netdev_rx_handler *rx_handler;
struct net_device *orig_dev;
struct net_device *null_or_dev;
bool deliver_exact = false;
@@ -3445,7 +3455,7 @@ ncls:
ret = deliver_skb(skb, pt_prev, orig_dev);
pt_prev = NULL;
}
- switch (rx_handler(&skb)) {
+ switch (rx_handler->func(&skb, rx_handler)) {
case RX_HANDLER_CONSUMED:
ret = NET_RX_SUCCESS;
goto unlock;
diff --git a/net/openvswitch/dp_notify.c b/net/openvswitch/dp_notify.c
index 5558350..5248f8e 100644
--- a/net/openvswitch/dp_notify.c
+++ b/net/openvswitch/dp_notify.c
@@ -32,7 +32,7 @@ static int dp_device_event(struct notifier_block *unused, unsigned long event,
if (ovs_is_internal_dev(dev))
vport = ovs_internal_dev_get_vport(dev);
else
- vport = ovs_netdev_get_vport(dev);
+ vport = ovs_netdev_get_vport_rtnl(dev);
if (!vport)
return NOTIFY_DONE;
diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
index 2130d61..0ff6aa1 100644
--- a/net/openvswitch/vport-netdev.c
+++ b/net/openvswitch/vport-netdev.c
@@ -35,9 +35,6 @@
/* Must be called with rcu_read_lock. */
static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
{
- if (unlikely(!vport))
- goto error;
-
if (unlikely(skb_warn_if_lro(skb)))
goto error;
@@ -57,7 +54,8 @@ error:
}
/* Called with rcu_read_lock and bottom-halves disabled. */
-static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
+static rx_handler_result_t
+netdev_frame_hook(struct sk_buff **pskb, struct netdev_rx_handler *rx_handler)
{
struct sk_buff *skb = *pskb;
struct vport *vport;
@@ -65,7 +63,7 @@ static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
return RX_HANDLER_PASS;
- vport = ovs_netdev_get_vport(skb->dev);
+ vport = ovs_netdev_get_vport_by_rx_handler(rx_handler);
netdev_port_receive(vport, skb);
@@ -100,8 +98,8 @@ static struct vport *netdev_create(const struct vport_parms *parms)
goto error_put;
}
- err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
- vport);
+ netdev_rx_handler_init(&vport->rx_handler, netdev_frame_hook);
+ err = netdev_rx_handler_register(netdev_vport->dev, &vport->rx_handler);
if (err)
goto error_put;
@@ -185,16 +183,6 @@ error:
return 0;
}
-/* Returns null if this device is not attached to a datapath. */
-struct vport *ovs_netdev_get_vport(struct net_device *dev)
-{
- if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
- return (struct vport *)
- rcu_dereference_rtnl(dev->rx_handler_data);
- else
- return NULL;
-}
-
const struct vport_ops ovs_netdev_vport_ops = {
.type = OVS_VPORT_TYPE_NETDEV,
.create = netdev_create,
diff --git a/net/openvswitch/vport-netdev.h b/net/openvswitch/vport-netdev.h
index 6478079..d3f1471 100644
--- a/net/openvswitch/vport-netdev.h
+++ b/net/openvswitch/vport-netdev.h
@@ -24,7 +24,21 @@
#include "vport.h"
-struct vport *ovs_netdev_get_vport(struct net_device *dev);
+#define ovs_netdev_vport_exists(dev) (dev->priv_flags & IFF_OVS_DATAPATH)
+
+static inline struct vport *
+ovs_netdev_get_vport_by_rx_handler(const struct netdev_rx_handler *rx_handler)
+{
+ return container_of(rx_handler, struct vport, rx_handler);
+}
+
+static inline struct vport *
+ovs_netdev_get_vport_rtnl(const struct net_device *dev)
+{
+ if (!ovs_netdev_vport_exists(dev))
+ return NULL;
+ return ovs_netdev_get_vport_by_rx_handler(rtnl_dereference(dev->rx_handler));
+}
struct netdev_vport {
struct rcu_head rcu;
diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
index aee7d43..a7a07c0 100644
--- a/net/openvswitch/vport.h
+++ b/net/openvswitch/vport.h
@@ -67,6 +67,7 @@ struct vport_err_stats {
/**
* struct vport - one port within a datapath
+ * @rx_handler: RX handler structure.
* @rcu: RCU callback head for deferred destruction.
* @dp: Datapath to which this port belongs.
* @upcall_portid: The Netlink port to use for packets received on this port that
@@ -80,6 +81,7 @@ struct vport_err_stats {
* @err_stats: Points to error statistics used and maintained by vport
*/
struct vport {
+ struct netdev_rx_handler rx_handler;
struct rcu_head rcu;
struct datapath *dp;
u32 upcall_portid;
--
1.8.1.2
--
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