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Message-ID: <20110305153120.GG8573@psychotron.redhat.com>
Date: Sat, 5 Mar 2011 16:31:20 +0100
From: Jiri Pirko <jpirko@...hat.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, shemminger@...ux-foundation.org,
kaber@...sh.net, fubar@...ibm.com, eric.dumazet@...il.com,
nicolas.2p.debian@...il.com, andy@...yhouse.net
Subject: [patch net-next-2.6 7/8 v2] net: introduce rx_handler results and
logic around that
This patch allows rx_handlers to better signalize what to do next to
it's caller. That makes skb->deliver_no_wcard no longer needed.
Signed-off-by: Jiri Pirko <jpirko@...hat.com>
Reviewed-by: Nicolas de Pesloüan <nicolas.2p.debian@...e.fr>
v1->v2:
moved __copy_skb_header hunk from 8/8 here
---
drivers/net/bonding/bond_main.c | 20 +++++++++++---------
drivers/net/macvlan.c | 11 ++++++-----
include/linux/netdevice.h | 9 ++++++++-
include/linux/skbuff.h | 5 +----
net/bridge/br_input.c | 25 +++++++++++++++----------
net/bridge/br_private.h | 2 +-
net/core/dev.c | 19 ++++++++++++-------
net/core/skbuff.c | 1 -
8 files changed, 54 insertions(+), 38 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 8ba7faa..ab56190 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1483,20 +1483,23 @@ static bool bond_should_deliver_exact_match(struct sk_buff *skb,
return false;
}
-static struct sk_buff *bond_handle_frame(struct sk_buff *skb)
+static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
{
+ struct sk_buff *skb = *pskb;
struct slave *slave;
struct net_device *bond_dev;
struct bonding *bond;
- skb = skb_share_check(skb, GFP_ATOMIC);
- if (unlikely(!skb))
- return NULL;
-
slave = bond_slave_get_rcu(skb->dev);
bond_dev = ACCESS_ONCE(slave->dev->master);
if (unlikely(!bond_dev))
- return skb;
+ return RX_HANDLER_PASS;
+
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (unlikely(!skb))
+ return RX_HANDLER_CONSUMED;
+
+ *pskb = skb;
bond = netdev_priv(bond_dev);
@@ -1513,8 +1516,7 @@ static struct sk_buff *bond_handle_frame(struct sk_buff *skb)
}
if (bond_should_deliver_exact_match(skb, slave, bond)) {
- skb->deliver_no_wcard = 1;
- return skb;
+ return RX_HANDLER_EXACT;
}
skb->dev = bond_dev;
@@ -1527,7 +1529,7 @@ static struct sk_buff *bond_handle_frame(struct sk_buff *skb)
memcpy(dest, bond_dev->dev_addr, ETH_ALEN);
}
- return skb;
+ return RX_HANDLER_ANOTHER;
}
/* enslave device <slave> to bond device <master> */
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 6ed577b..ead9a8f 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -152,9 +152,10 @@ static void macvlan_broadcast(struct sk_buff *skb,
}
/* called under rcu_read_lock() from netif_receive_skb */
-static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
+static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
{
struct macvlan_port *port;
+ struct sk_buff *skb = *pskb;
const struct ethhdr *eth = eth_hdr(skb);
const struct macvlan_dev *vlan;
const struct macvlan_dev *src;
@@ -184,7 +185,7 @@ static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
*/
macvlan_broadcast(skb, port, src->dev,
MACVLAN_MODE_VEPA);
- return skb;
+ return RX_HANDLER_PASS;
}
if (port->passthru)
@@ -192,12 +193,12 @@ static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
else
vlan = macvlan_hash_lookup(port, eth->h_dest);
if (vlan == NULL)
- return skb;
+ return RX_HANDLER_PASS;
dev = vlan->dev;
if (unlikely(!(dev->flags & IFF_UP))) {
kfree_skb(skb);
- return NULL;
+ return RX_HANDLER_CONSUMED;
}
len = skb->len + ETH_HLEN;
skb = skb_share_check(skb, GFP_ATOMIC);
@@ -211,7 +212,7 @@ static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
out:
macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
- return NULL;
+ return RX_HANDLER_CONSUMED;
}
static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 8be4056..ff386a4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -390,7 +390,14 @@ enum gro_result {
};
typedef enum gro_result gro_result_t;
-typedef struct sk_buff *rx_handler_func_t(struct sk_buff *skb);
+enum rx_handler_result {
+ RX_HANDLER_CONSUMED,
+ RX_HANDLER_ANOTHER,
+ 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);
extern void __napi_schedule(struct napi_struct *n);
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 31f02d0..24cfa62 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -388,10 +388,7 @@ struct sk_buff {
kmemcheck_bitfield_begin(flags2);
__u16 queue_mapping:16;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
- __u8 ndisc_nodetype:2,
- deliver_no_wcard:1;
-#else
- __u8 deliver_no_wcard:1;
+ __u8 ndisc_nodetype:2;
#endif
__u8 ooo_okay:1;
kmemcheck_bitfield_end(flags2);
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 88e4aa9..e216079 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -139,21 +139,22 @@ static inline int is_link_local(const unsigned char *dest)
* Return NULL if skb is handled
* note: already called with rcu_read_lock
*/
-struct sk_buff *br_handle_frame(struct sk_buff *skb)
+rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
{
struct net_bridge_port *p;
+ struct sk_buff *skb = *pskb;
const unsigned char *dest = eth_hdr(skb)->h_dest;
br_should_route_hook_t *rhook;
if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
- return skb;
+ return RX_HANDLER_PASS;
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
goto drop;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
- return NULL;
+ return RX_HANDLER_CONSUMED;
p = br_port_get_rcu(skb->dev);
@@ -167,10 +168,12 @@ struct sk_buff *br_handle_frame(struct sk_buff *skb)
goto forward;
if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
- NULL, br_handle_local_finish))
- return NULL; /* frame consumed by filter */
- else
- return skb; /* continue processing */
+ NULL, br_handle_local_finish)) {
+ return RX_HANDLER_CONSUMED; /* consumed by filter */
+ } else {
+ *pskb = skb;
+ return RX_HANDLER_PASS; /* continue processing */
+ }
}
forward:
@@ -178,8 +181,10 @@ forward:
case BR_STATE_FORWARDING:
rhook = rcu_dereference(br_should_route_hook);
if (rhook) {
- if ((*rhook)(skb))
- return skb;
+ if ((*rhook)(skb)) {
+ *pskb = skb;
+ return RX_HANDLER_PASS;
+ }
dest = eth_hdr(skb)->h_dest;
}
/* fall through */
@@ -194,5 +199,5 @@ forward:
drop:
kfree_skb(skb);
}
- return NULL;
+ return RX_HANDLER_CONSUMED;
}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index f7afc36..19e2f46 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -379,7 +379,7 @@ extern void br_features_recompute(struct net_bridge *br);
/* br_input.c */
extern int br_handle_frame_finish(struct sk_buff *skb);
-extern struct sk_buff *br_handle_frame(struct sk_buff *skb);
+extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
/* 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 9f66de9..58daddb 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3121,6 +3121,7 @@ static int __netif_receive_skb(struct sk_buff *skb)
rx_handler_func_t *rx_handler;
struct net_device *orig_dev;
struct net_device *null_or_dev;
+ bool deliver_exact = false;
int ret = NET_RX_DROP;
__be16 type;
@@ -3173,18 +3174,22 @@ ncls:
rx_handler = rcu_dereference(skb->dev->rx_handler);
if (rx_handler) {
- struct net_device *prev_dev;
-
if (pt_prev) {
ret = deliver_skb(skb, pt_prev, orig_dev);
pt_prev = NULL;
}
- prev_dev = skb->dev;
- skb = rx_handler(skb);
- if (!skb)
+ switch (rx_handler(&skb)) {
+ case RX_HANDLER_CONSUMED:
goto out;
- if (skb->dev != prev_dev)
+ case RX_HANDLER_ANOTHER:
goto another_round;
+ case RX_HANDLER_EXACT:
+ deliver_exact = true;
+ case RX_HANDLER_PASS:
+ break;
+ default:
+ BUG();
+ }
}
if (vlan_tx_tag_present(skb)) {
@@ -3202,7 +3207,7 @@ ncls:
vlan_on_bond_hook(skb);
/* deliver only exact match when indicated */
- null_or_dev = skb->deliver_no_wcard ? skb->dev : NULL;
+ null_or_dev = deliver_exact ? skb->dev : NULL;
type = skb->protocol;
list_for_each_entry_rcu(ptype,
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 1eb526a..801dd08 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -523,7 +523,6 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
new->ip_summed = old->ip_summed;
skb_copy_queue_mapping(new, old);
new->priority = old->priority;
- new->deliver_no_wcard = old->deliver_no_wcard;
#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
new->ipvs_property = old->ipvs_property;
#endif
--
1.7.4
--
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