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, jdike@linux.intel.com
Cc: Xin Xiaohui <xiaohui.xin@intel.com>
Subject: [RFC][PATCH v6 07/19] Add interface to get external buffers.
Date: Fri, 21 May 2010 17:30:23 +0800 [thread overview]
Message-ID: <1274434235-5929-8-git-send-email-xiaohui.xin@intel.com> (raw)
In-Reply-To: <1274434235-5929-7-git-send-email-xiaohui.xin@intel.com>
From: Xin Xiaohui <xiaohui.xin@intel.com>
Currently, it can get external buffers from mp device.
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>
---
include/linux/skbuff.h | 12 ++++++++++++
net/core/skbuff.c | 16 ++++++++++++++++
2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index cf309c9..281a1c0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1519,6 +1519,18 @@ static inline void netdev_free_page(struct net_device *dev, struct page *page)
__free_page(page);
}
+extern struct skb_external_page *netdev_alloc_external_pages(
+ struct net_device *dev,
+ struct sk_buff *skb, int npages);
+
+static inline struct skb_external_page *netdev_alloc_external_page(
+ struct net_device *dev,
+ struct sk_buff *skb, unsigned int size)
+{
+ return netdev_alloc_external_pages(dev, skb,
+ DIV_ROUND_UP(size, PAGE_SIZE));
+}
+
/**
* skb_clone_writable - is the header of a clone writable
* @skb: buffer to check
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 93c4e06..fbdb1f1 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -278,6 +278,22 @@ struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
}
EXPORT_SYMBOL(__netdev_alloc_page);
+struct skb_external_page *netdev_alloc_external_pages(struct net_device *dev,
+ struct sk_buff *skb, int npages)
+{
+ struct mpassthru_port *port;
+ struct skb_external_page *ext_page = NULL;
+
+ port = rcu_dereference(dev->mp_port);
+ if (!port)
+ goto out;
+ WARN_ON(npages > port->npages);
+ ext_page = port->ctor(port, skb, npages);
+out:
+ return ext_page;
+}
+EXPORT_SYMBOL(netdev_alloc_external_pages);
+
void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
int size)
{
--
1.5.4.4
next prev parent reply other threads:[~2010-05-21 9:30 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-21 9:30 [RFC][PATCH v6 00/19] Provide a zero-copy method on KVM virtio-net xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 01/19] Add a new structure for skb buffer from external xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 02/19] Add a new struct for device to manipulate external buffer xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 03/19] Export 2 func for device to assign/deassign new strucure xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 04/19] Add a ndo_mp_port_prep pointer to net_device_ops xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 05/19] Add a function make external buffer owner to query capability xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 06/19] Add a function to indicate if device use external buffer xiaohui.xin
2010-05-21 9:30 ` xiaohui.xin [this message]
2010-05-21 9:30 ` [RFC][PATCH v6 08/19] Make __alloc_skb() to get " xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 09/19] Ignore room skb_reserve() when device is using " xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 10/19] Don't do skb recycle, if device use " xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 11/19] Use callback to deal with skb_release_data() specially xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 12/19] Add a hook to intercept external buffers from NIC driver xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 13/19] To skip GRO if buffer is external currently xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 14/19] Add header file for mp device xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 15/19] Add basic funcs and ioctl to " xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 16/19] Manipulate external buffers in " xiaohui.xin
2010-05-21 9:30 ` [PATCH v6 17/19] Export proto_ops to vhost-net driver xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 18/19] Add a kconfig entry and make entry for mp device xiaohui.xin
2010-05-21 9:30 ` [RFC][PATCH v6 19/19] Provides multiple submits and asynchronous notifications xiaohui.xin
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