From: xiaohui.xin@intel.com
To: netdev@vger.kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, mst@redhat.com, mingo@elte.hu,
davem@davemloft.net, herbert@gondor.hengli.com.au,
jdike@linux.intel.com
Cc: Xin Xiaohui <xiaohui.xin@intel.com>
Subject: [PATCH v13 10/16] Add a hook to intercept external buffers from NIC driver.
Date: Fri, 15 Oct 2010 17:12:11 +0800 [thread overview]
Message-ID: <33f51c5eddec843260451eccbfa3c5fdea13b479.1287132437.git.xiaohui.xin@intel.com> (raw)
In-Reply-To: <1287133937-5538-1-git-send-email-xiaohui.xin@intel.com>
In-Reply-To: <fc6e95d63a2c62aaf77f8ded22fc43ccefcdbbff.1287132437.git.xiaohui.xin@intel.com>
From: Xin Xiaohui <xiaohui.xin@intel.com>
The hook is called in __netif_receive_skb().
Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
Signed-off-by: Zhao Yu <yzhao81new@gmail.com>
Reviewed-by: Jeff Dike <jdike@linux.intel.com>
---
net/core/dev.c | 37 +++++++++++++++++++++++++++++++++++++
1 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index e48639d..235eaab 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2814,6 +2814,37 @@ int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
}
EXPORT_SYMBOL(__skb_bond_should_drop);
+#if defined(CONFIG_MEDIATE_PASSTHRU) || defined(CONFIG_MEDIATE_PASSTHRU_MODULE)
+/* Add a hook to intercept mediate passthru(zero-copy) packets,
+ * and insert it to the socket queue owned by mp_port specially.
+ */
+static inline struct sk_buff *handle_mpassthru(struct sk_buff *skb,
+ struct packet_type **pt_prev,
+ int *ret,
+ struct net_device *orig_dev)
+{
+ struct mp_port *mp_port = NULL;
+ struct sock *sk = NULL;
+
+ if (!dev_is_mpassthru(skb->dev))
+ return skb;
+ mp_port = skb->dev->mp_port;
+
+ if (*pt_prev) {
+ *ret = deliver_skb(skb, *pt_prev, orig_dev);
+ *pt_prev = NULL;
+ }
+
+ sk = mp_port->sock->sk;
+ skb_queue_tail(&sk->sk_receive_queue, skb);
+ sk->sk_state_change(sk);
+
+ return NULL;
+}
+#else
+#define handle_mpassthru(skb, pt_prev, ret, orig_dev) (skb)
+#endif
+
static int __netif_receive_skb(struct sk_buff *skb)
{
struct packet_type *ptype, *pt_prev;
@@ -2891,6 +2922,11 @@ static int __netif_receive_skb(struct sk_buff *skb)
ncls:
#endif
+ /* To intercept mediate passthru(zero-copy) packets here */
+ skb = handle_mpassthru(skb, &pt_prev, &ret, orig_dev);
+ if (!skb)
+ goto out;
+
/* Handle special case of bridge or macvlan */
rx_handler = rcu_dereference(skb->dev->rx_handler);
if (rx_handler) {
@@ -2991,6 +3027,7 @@ err:
EXPORT_SYMBOL(netdev_mp_port_prep);
#endif
+
/**
* netif_receive_skb - process receive buffer from network
* @skb: buffer to process
--
1.7.3
next prev parent reply other threads:[~2010-10-15 8:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-15 9:12 [PATCH v13 00/16] Provide a zero-copy method on KVM virtio-net xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 01/16] Add a new structure for skb buffer from external xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 02/16] Add a new struct for device to manipulate external buffer xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 03/16] Add a ndo_mp_port_prep pointer to net_device_ops xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 04/16] Add a function make external buffer owner to query capability xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 05/16] Add a function to indicate if device use external buffer xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 06/16]Use callback to deal with skb_release_data() specially xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 07/16] Modify netdev_alloc_page() to get external buffer xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 08/16] Modify netdev_free_page() to release " xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 09/16]Don't do skb recycle, if device use " xiaohui.xin
2010-10-15 9:12 ` xiaohui.xin [this message]
2010-10-19 15:24 ` [PATCH v13 10/16] Add a hook to intercept external buffers from NIC driver David Miller
2010-10-27 1:33 ` Xin, Xiaohui
2010-10-29 20:28 ` David Miller
2010-11-08 7:43 ` Xin, Xiaohui
2010-10-15 9:12 ` [PATCH v13 11/16] Add header file for mp device xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 12/16] Add mp(mediate passthru) device xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 13/16] Add a kconfig entry and make entry for mp device xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 14/16]Provides multiple submits and asynchronous notifications xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 15/16] An example how to modifiy NIC driver to use napi_gro_frags() interface xiaohui.xin
2010-10-15 9:12 ` [PATCH v13 16/16] An example how to alloc user buffer based on " xiaohui.xin
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