netdev - [RFC PATCH 06/14] netdevice: add AF

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Date:   Tue, 31 Oct 2017 13:41:37 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     bjorn.topel@...il.com, magnus.karlsson@...el.com,
        alexander.h.duyck@...el.com, alexander.duyck@...il.com,
        john.fastabend@...il.com, ast@...com, brouer@...hat.com,
        michael.lundkvist@...csson.com, ravineet.singh@...csson.com,
        daniel@...earbox.net, netdev@...r.kernel.org
Cc:     jesse.brandeburg@...el.com, anjali.singhai@...el.com,
        rami.rosen@...el.com, jeffrey.b.shaw@...el.com,
        ferruh.yigit@...el.com, qi.z.zhang@...el.com
Subject: [RFC PATCH 06/14] netdevice: add AF_PACKET V4 zerocopy ops

From: Magnus Karlsson <magnus.karlsson@...el.com>

Two new ndo ops are added. One for enabling/disabling AF_PACKET V4
zerocopy, and one for kicking the egress ring.

Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
 include/linux/netdevice.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5e02f79b2110..1421206bf243 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -833,6 +833,8 @@ struct dev_ifalias {
 	char ifalias[];
 };
 
+struct tp4_netdev_parms;
+
 /*
  * This structure defines the management hooks for network devices.
  * The following hooks can be defined; unless noted otherwise, they are
@@ -1133,6 +1135,15 @@ struct dev_ifalias {
  * void (*ndo_xdp_flush)(struct net_device *dev);
  *	This function is used to inform the driver to flush a particular
  *	xdp tx queue. Must be called on same CPU as xdp_xmit.
+ * int (*ndo_tp4_zerocopy)(struct net_device *dev,
+ *			   struct tp4_netdev_parms *parms);
+ *	This function is used to enable and disable the AF_PACKET V4
+ *	PACKET_ZEROCOPY support. See definition of enum tp4_netdev_command
+ *	in tpacket4.h for details.
+ * int (*ndo_tp4_xmit)(struct net_device *dev, int queue_pair);
+ *	This function is used to send packets when the PACKET_ZEROCOPY
+ *	option is set. The rtnl lock is not held when entering this
+ *	function.
  */
 struct net_device_ops {
 	int			(*ndo_init)(struct net_device *dev);
@@ -1320,6 +1331,11 @@ struct net_device_ops {
 	int			(*ndo_xdp_xmit)(struct net_device *dev,
 						struct xdp_buff *xdp);
 	void			(*ndo_xdp_flush)(struct net_device *dev);
+	int                     (*ndo_tp4_zerocopy)(
+					struct net_device *dev,
+					struct tp4_netdev_parms *parms);
+	int                     (*ndo_tp4_xmit)(struct net_device *dev,
+						int queue_pair);
 };
 
 /**
-- 
2.11.0