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Date: Thu, 04 Sep 2014 13:31:35 -0400
From: Alexander Duyck <alexander.h.duyck@...el.com>
To: netdev@...r.kernel.org
Cc: richardcochran@...il.com, davem@...emloft.net, willemb@...gle.com
Subject: [PATCH net-next v4 2/3] net-timestamp: Make the clone operation
stand-alone from phy timestamping
The phy timestamping takes a different path than the regular timestamping
does in that it will create a clone first so that the packets needing to be
timestamped can be placed in a queue, or the context block could be used.
In order to support these use cases I am pulling the core of the code out
so it can be used in other drivers beyond just phy devices.
In addition I have added a destructor named sock_efree which is meant to
provide a simple way for dropping the reference to skb exceptions that
aren't part of either the receive or send windows for the socket, and I
have removed some duplication in spots where this destructor could be used
in place of sock_edemux.
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---
v2: Renamed function to skb_clone_sk.
Added destructor to call sock_put instead of doing it ourselves.
Dropped freeing functionality from skb_complete_tx_timestamp.
Added additional documentation to the code.
v3: Renamed destructor sock_efree and moved to sock.c/h
Added sock_hold/sock_put around call to sock_queue_err_skb
v4: Dropped combining sock_edemux with sock_efree where the 2 are identical
drivers/net/phy/dp83640.c | 6 +++---
include/linux/skbuff.h | 2 ++
include/net/sock.h | 1 +
net/core/skbuff.c | 32 +++++++++++++++++++++++++-------
net/core/sock.c | 6 ++++++
net/core/timestamping.c | 14 +++-----------
6 files changed, 40 insertions(+), 21 deletions(-)
diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index d5991ac..87648b3 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -1148,7 +1148,7 @@ static void dp83640_remove(struct phy_device *phydev)
kfree_skb(skb);
while ((skb = skb_dequeue(&dp83640->tx_queue)) != NULL)
- skb_complete_tx_timestamp(skb, NULL);
+ kfree_skb(skb);
clock = dp83640_clock_get(dp83640->clock);
@@ -1405,7 +1405,7 @@ static void dp83640_txtstamp(struct phy_device *phydev,
case HWTSTAMP_TX_ONESTEP_SYNC:
if (is_sync(skb, type)) {
- skb_complete_tx_timestamp(skb, NULL);
+ kfree_skb(skb);
return;
}
/* fall through */
@@ -1416,7 +1416,7 @@ static void dp83640_txtstamp(struct phy_device *phydev,
case HWTSTAMP_TX_OFF:
default:
- skb_complete_tx_timestamp(skb, NULL);
+ kfree_skb(skb);
break;
}
}
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 02529fc..1cf0cfa 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2690,6 +2690,8 @@ static inline ktime_t net_invalid_timestamp(void)
return ktime_set(0, 0);
}
+struct sk_buff *skb_clone_sk(struct sk_buff *skb);
+
#ifdef CONFIG_NETWORK_PHY_TIMESTAMPING
void skb_clone_tx_timestamp(struct sk_buff *skb);
diff --git a/include/net/sock.h b/include/net/sock.h
index 3fde613..e02be37 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1574,6 +1574,7 @@ struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
void sock_wfree(struct sk_buff *skb);
void skb_orphan_partial(struct sk_buff *skb);
void sock_rfree(struct sk_buff *skb);
+void sock_efree(struct sk_buff *skb);
void sock_edemux(struct sk_buff *skb);
int sock_setsockopt(struct socket *sock, int level, int op,
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 697e696..a936a40 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3511,6 +3511,27 @@ struct sk_buff *sock_dequeue_err_skb(struct sock *sk)
}
EXPORT_SYMBOL(sock_dequeue_err_skb);
+struct sk_buff *skb_clone_sk(struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+ struct sk_buff *clone;
+
+ if (!sk || !atomic_inc_not_zero(&sk->sk_refcnt))
+ return NULL;
+
+ clone = skb_clone(skb, GFP_ATOMIC);
+ if (!clone) {
+ sock_put(sk);
+ return NULL;
+ }
+
+ clone->sk = sk;
+ clone->destructor = sock_efree;
+
+ return clone;
+}
+EXPORT_SYMBOL(skb_clone_sk);
+
static void __skb_complete_tx_timestamp(struct sk_buff *skb,
struct sock *sk,
int tstype)
@@ -3540,14 +3561,11 @@ void skb_complete_tx_timestamp(struct sk_buff *skb,
{
struct sock *sk = skb->sk;
- skb->sk = NULL;
+ /* take a reference to prevent skb_orphan() from freeing the socket */
+ sock_hold(sk);
- if (hwtstamps) {
- *skb_hwtstamps(skb) = *hwtstamps;
- __skb_complete_tx_timestamp(skb, sk, SCM_TSTAMP_SND);
- } else {
- kfree_skb(skb);
- }
+ *skb_hwtstamps(skb) = *hwtstamps;
+ __skb_complete_tx_timestamp(skb, sk, SCM_TSTAMP_SND);
sock_put(sk);
}
diff --git a/net/core/sock.c b/net/core/sock.c
index f1a638e..d04005c 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1637,6 +1637,12 @@ void sock_rfree(struct sk_buff *skb)
}
EXPORT_SYMBOL(sock_rfree);
+void sock_efree(struct sk_buff *skb)
+{
+ sock_put(skb->sk);
+}
+EXPORT_SYMBOL(sock_efree);
+
void sock_edemux(struct sk_buff *skb)
{
struct sock *sk = skb->sk;
diff --git a/net/core/timestamping.c b/net/core/timestamping.c
index f48a59f..43d3dd6 100644
--- a/net/core/timestamping.c
+++ b/net/core/timestamping.c
@@ -36,10 +36,9 @@ void skb_clone_tx_timestamp(struct sk_buff *skb)
{
struct phy_device *phydev;
struct sk_buff *clone;
- struct sock *sk = skb->sk;
unsigned int type;
- if (!sk)
+ if (!skb->sk)
return;
type = classify(skb);
@@ -48,16 +47,9 @@ void skb_clone_tx_timestamp(struct sk_buff *skb)
phydev = skb->dev->phydev;
if (likely(phydev->drv->txtstamp)) {
- if (!atomic_inc_not_zero(&sk->sk_refcnt))
+ clone = skb_clone_sk(skb);
+ if (!clone)
return;
-
- clone = skb_clone(skb, GFP_ATOMIC);
- if (!clone) {
- sock_put(sk);
- return;
- }
-
- clone->sk = sk;
phydev->drv->txtstamp(phydev, clone, type);
}
}
--
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