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 16/16] An example how to alloc user buffer based on napi_gro_frags() interface.
Date: Fri, 15 Oct 2010 17:12:17 +0800 [thread overview]
Message-ID: <cdda4947e455993bf342a22d388ef05d44e6dfde.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>
This example is made on ixgbe driver which using napi_gro_frags().
It can get buffers from guest side directly using netdev_alloc_page()
and release guest buffers using netdev_free_page().
Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
---
drivers/net/ixgbe/ixgbe_main.c | 24 ++++++++++++++++++++----
1 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index a4a5263..47663ac 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -1032,7 +1032,14 @@ static inline void ixgbe_release_rx_desc(struct ixgbe_hw *hw,
static bool is_rx_buffer_mapped_as_page(struct ixgbe_rx_buffer *bi,
struct net_device *dev)
{
- return true;
+ return dev_is_mpassthru(dev);
+}
+
+static u32 get_page_skb_offset(struct net_device *dev)
+{
+ if (!dev_is_mpassthru(dev))
+ return 0;
+ return dev->mp_port->vnet_hlen;
}
/**
@@ -1105,7 +1112,8 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
adapter->alloc_rx_page_failed++;
goto no_buffers;
}
- bi->page_skb_offset = 0;
+ bi->page_skb_offset =
+ get_page_skb_offset(adapter->netdev);
bi->dma = dma_map_page(&pdev->dev, bi->page_skb,
bi->page_skb_offset,
(PAGE_SIZE / 2),
@@ -1242,8 +1250,10 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
len = le16_to_cpu(rx_desc->wb.upper.length);
}
- if (is_no_buffer(rx_buffer_info))
+ if (is_no_buffer(rx_buffer_info)) {
+ printk("no buffers\n");
break;
+ }
cleaned = true;
if (!rx_buffer_info->mapped_as_page) {
@@ -1299,6 +1309,11 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
rx_buffer_info->page_skb,
rx_buffer_info->page_skb_offset,
len);
+ if (dev_is_mpassthru(netdev) &&
+ netdev->mp_port->hash)
+ skb_shinfo(skb)->destructor_arg =
+ netdev->mp_port->hash(netdev,
+ rx_buffer_info->page_skb);
rx_buffer_info->page_skb = NULL;
skb->len += len;
skb->data_len += len;
@@ -1316,7 +1331,8 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
upper_len);
if ((rx_ring->rx_buf_len > (PAGE_SIZE / 2)) ||
- (page_count(rx_buffer_info->page) != 1))
+ (page_count(rx_buffer_info->page) != 1) ||
+ dev_is_mpassthru(netdev))
rx_buffer_info->page = NULL;
else
get_page(rx_buffer_info->page);
--
1.7.3
prev parent reply other threads:[~2010-10-15 8:53 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 ` [PATCH v13 10/16] Add a hook to intercept external buffers from NIC driver xiaohui.xin
2010-10-19 15:24 ` 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 ` xiaohui.xin [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=cdda4947e455993bf342a22d388ef05d44e6dfde.1287132437.git.xiaohui.xin@intel.com \
--to=xiaohui.xin@intel.com \
--cc=davem@davemloft.net \
--cc=herbert@gondor.hengli.com.au \
--cc=jdike@linux.intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mst@redhat.com \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®