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Date: Thu, 29 Oct 2009 17:18:15 +0000
From: Ben Hutchings <bhutchings@...arflare.com>
To: David Miller <davem@...emloft.net>
Cc: Herbert Xu <herbert@...dor.apana.org.au>, netdev@...r.kernel.org,
linux-net-drivers@...arflare.com
Subject: [PATCH 2/4] gro: Change all receive functions to return GRO result
codes
This will allow drivers to adjust their receive path dynamically
based on whether GRO is being applied successfully.
Currently all in-tree callers ignore the return values of these
functions and do not need to be changed.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
include/linux/if_vlan.h | 25 ++++++++++++++-----------
include/linux/netdevice.h | 8 ++++----
net/8021q/vlan_core.c | 16 +++++++++-------
net/core/dev.c | 38 +++++++++++++++-----------------------
4 files changed, 42 insertions(+), 45 deletions(-)
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 7ff9af1..5be7680 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -115,10 +115,12 @@ extern u16 vlan_dev_vlan_id(const struct net_device *dev);
extern int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
u16 vlan_tci, int polling);
extern int vlan_hwaccel_do_receive(struct sk_buff *skb);
-extern int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci, struct sk_buff *skb);
-extern int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci);
+extern gro_result_t
+vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
+ unsigned int vlan_tci, struct sk_buff *skb);
+extern gro_result_t
+vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
+ unsigned int vlan_tci);
#else
static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
@@ -145,17 +147,18 @@ static inline int vlan_hwaccel_do_receive(struct sk_buff *skb)
return 0;
}
-static inline int vlan_gro_receive(struct napi_struct *napi,
- struct vlan_group *grp,
- unsigned int vlan_tci, struct sk_buff *skb)
+static inline gro_result_t
+vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
+ unsigned int vlan_tci, struct sk_buff *skb)
{
- return NET_RX_DROP;
+ return GRO_DROP;
}
-static inline int vlan_gro_frags(struct napi_struct *napi,
- struct vlan_group *grp, unsigned int vlan_tci)
+static inline gro_result_t
+vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
+ unsigned int vlan_tci)
{
- return NET_RX_DROP;
+ return GRO_DROP;
}
#endif
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9fdf48e..218a0f6 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1470,17 +1470,17 @@ extern int netif_receive_skb(struct sk_buff *skb);
extern void napi_gro_flush(struct napi_struct *napi);
extern gro_result_t dev_gro_receive(struct napi_struct *napi,
struct sk_buff *skb);
-extern int napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
-extern int napi_gro_receive(struct napi_struct *napi,
+extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
+extern gro_result_t napi_gro_receive(struct napi_struct *napi,
struct sk_buff *skb);
extern void napi_reuse_skb(struct napi_struct *napi,
struct sk_buff *skb);
extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
-extern int napi_frags_finish(struct napi_struct *napi,
+extern gro_result_t napi_frags_finish(struct napi_struct *napi,
struct sk_buff *skb,
gro_result_t ret);
extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
-extern int napi_gro_frags(struct napi_struct *napi);
+extern gro_result_t napi_gro_frags(struct napi_struct *napi);
static inline void napi_free_frags(struct napi_struct *napi)
{
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 47a80d6..8d5ca2a 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -102,11 +102,12 @@ drop:
return GRO_DROP;
}
-int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci, struct sk_buff *skb)
+gro_result_t vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
+ unsigned int vlan_tci, struct sk_buff *skb)
{
if (netpoll_rx_on(skb))
- return vlan_hwaccel_receive_skb(skb, grp, vlan_tci);
+ return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
+ ? GRO_DROP : GRO_NORMAL;
skb_gro_reset_offset(skb);
@@ -114,17 +115,18 @@ int vlan_gro_receive(struct napi_struct *napi, struct vlan_group *grp,
}
EXPORT_SYMBOL(vlan_gro_receive);
-int vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
- unsigned int vlan_tci)
+gro_result_t vlan_gro_frags(struct napi_struct *napi, struct vlan_group *grp,
+ unsigned int vlan_tci)
{
struct sk_buff *skb = napi_frags_skb(napi);
if (!skb)
- return NET_RX_DROP;
+ return GRO_DROP;
if (netpoll_rx_on(skb)) {
skb->protocol = eth_type_trans(skb, skb->dev);
- return vlan_hwaccel_receive_skb(skb, grp, vlan_tci);
+ return vlan_hwaccel_receive_skb(skb, grp, vlan_tci)
+ ? GRO_DROP : GRO_NORMAL;
}
return napi_frags_finish(napi, skb,
diff --git a/net/core/dev.c b/net/core/dev.c
index 421dc93..f1bf49f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2549,24 +2549,21 @@ __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
return dev_gro_receive(napi, skb);
}
-int napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
+gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
{
- int err = NET_RX_SUCCESS;
-
switch (ret) {
case GRO_NORMAL:
- return netif_receive_skb(skb);
+ if (netif_receive_skb(skb))
+ ret = GRO_DROP;
+ break;
case GRO_DROP:
- err = NET_RX_DROP;
- /* fall through */
-
case GRO_MERGED_FREE:
kfree_skb(skb);
break;
}
- return err;
+ return ret;
}
EXPORT_SYMBOL(napi_skb_finish);
@@ -2586,7 +2583,7 @@ void skb_gro_reset_offset(struct sk_buff *skb)
}
EXPORT_SYMBOL(skb_gro_reset_offset);
-int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
+gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
skb_gro_reset_offset(skb);
@@ -2616,32 +2613,27 @@ struct sk_buff *napi_get_frags(struct napi_struct *napi)
}
EXPORT_SYMBOL(napi_get_frags);
-int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
- gro_result_t ret)
+gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
+ gro_result_t ret)
{
- int err = NET_RX_SUCCESS;
-
switch (ret) {
case GRO_NORMAL:
case GRO_HELD:
skb->protocol = eth_type_trans(skb, napi->dev);
- if (ret == GRO_NORMAL)
- return netif_receive_skb(skb);
-
- skb_gro_pull(skb, -ETH_HLEN);
+ if (ret == GRO_HELD)
+ skb_gro_pull(skb, -ETH_HLEN);
+ else if (netif_receive_skb(skb))
+ ret = GRO_DROP;
break;
case GRO_DROP:
- err = NET_RX_DROP;
- /* fall through */
-
case GRO_MERGED_FREE:
napi_reuse_skb(napi, skb);
break;
}
- return err;
+ return ret;
}
EXPORT_SYMBOL(napi_frags_finish);
@@ -2682,12 +2674,12 @@ out:
}
EXPORT_SYMBOL(napi_frags_skb);
-int napi_gro_frags(struct napi_struct *napi)
+gro_result_t napi_gro_frags(struct napi_struct *napi)
{
struct sk_buff *skb = napi_frags_skb(napi);
if (!skb)
- return NET_RX_DROP;
+ return GRO_DROP;
return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
}
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
--
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