Commit 5075314e authored by Alexander Duyck's avatar Alexander Duyck Committed by David S. Miller
Browse files

dsa: Split ops up, and avoid assigning tag_protocol and receive separately 



This change addresses several issues.

First, it was possible to set tag_protocol without setting the ops pointer.
To correct that I have reordered things so that rcv is now populated before
we set tag_protocol.

Second, it didn't make much sense to keep setting the device ops each time a
new slave was registered.  So by moving the receive portion out into root
switch initialization that issue should be addressed.

Third, I wanted to avoid sending tags if the rcv pointer was not registered
so I changed the tag check to verify if the rcv function pointer is set on
the root tree.  If it is then we start sending DSA tagged frames.

Finally I split the device ops pointer in the structures into two spots.  I
placed the rcv function pointer in the root switch since this makes it
easiest to access from there, and I placed the xmit function pointer in the
slave for the same reason.

Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6cca9adb

include/linux/netdevice.h

+0 −7
Original line number Diff line number Diff line
@@ -1928,13 +1928,6 @@ struct udp_offload { 
	struct offload_callbacks callbacks;

};



struct dsa_device_ops {

	netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);

	int (*rcv)(struct sk_buff *skb, struct net_device *dev,

		   struct packet_type *pt, struct net_device *orig_dev);

};





/* often modified stats are per cpu, other are shared (netdev->stats) */

struct pcpu_sw_netstats {

	u64     rx_packets;

include/net/dsa.h

+6 −4
Original line number Diff line number Diff line
@@ -77,7 +77,7 @@ struct dsa_platform_data { 
	struct dsa_chip_data	*chip;

};



struct dsa_device_ops;

struct packet_type;



struct dsa_switch_tree {

	/*
@@ -91,7 +91,10 @@ struct dsa_switch_tree { 
	 * protocol to use.

	 */

	struct net_device	*master_netdev;

	const struct dsa_device_ops	*ops;

	int			(*rcv)(struct sk_buff *skb,

				       struct net_device *dev,

				       struct packet_type *pt,

				       struct net_device *orig_dev);

	enum dsa_tag_protocol	tag_protocol;



	/*
@@ -218,7 +221,6 @@ static inline void *ds_to_priv(struct dsa_switch *ds) 


static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)

{

	return dst->tag_protocol != DSA_TAG_PROTO_NONE;

	return dst->rcv != NULL;

}



#endif

net/dsa/dsa.c

+28 −4
Original line number Diff line number Diff line
@@ -10,7 +10,6 @@ 
 */



#include <linux/list.h>

#include <linux/netdevice.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/module.h>
@@ -154,9 +153,34 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index, 
	 * tagging protocol to the preferred tagging format of this

	 * switch.

	 */

	if (ds->dst->cpu_switch == index)

		ds->dst->tag_protocol = drv->tag_protocol;

	if (dst->cpu_switch == index) {

		switch (drv->tag_protocol) {

#ifdef CONFIG_NET_DSA_TAG_DSA

		case DSA_TAG_PROTO_DSA:

			dst->rcv = dsa_netdev_ops.rcv;

			break;

#endif

#ifdef CONFIG_NET_DSA_TAG_EDSA

		case DSA_TAG_PROTO_EDSA:

			dst->rcv = edsa_netdev_ops.rcv;

			break;

#endif

#ifdef CONFIG_NET_DSA_TAG_TRAILER

		case DSA_TAG_PROTO_TRAILER:

			dst->rcv = trailer_netdev_ops.rcv;

			break;

#endif

#ifdef CONFIG_NET_DSA_TAG_BRCM

		case DSA_TAG_PROTO_BRCM:

			dst->rcv = brcm_netdev_ops.rcv;

			break;

#endif

		default:

			break;

		}



		dst->tag_protocol = drv->tag_protocol;

	}



	/*

	 * Do basic register setup.
@@ -626,7 +650,7 @@ static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev, 
		return 0;

	}



	return dst->ops->rcv(skb, dev, pt, orig_dev);

	return dst->rcv(skb, dev, pt, orig_dev);

}



static struct packet_type dsa_pack_type __read_mostly = {

net/dsa/dsa_priv.h

+10 −1
Original line number Diff line number Diff line
@@ -12,7 +12,13 @@ 
#define __DSA_PRIV_H



#include <linux/phy.h>

#include <net/dsa.h>

#include <linux/netdevice.h>



struct dsa_device_ops {

	netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);

	int (*rcv)(struct sk_buff *skb, struct net_device *dev,

		   struct packet_type *pt, struct net_device *orig_dev);

};



struct dsa_slave_priv {

	/*
@@ -20,6 +26,8 @@ struct dsa_slave_priv { 
	 * switch port.

	 */

	struct net_device	*dev;

	netdev_tx_t		(*xmit)(struct sk_buff *skb,

					struct net_device *dev);



	/*

	 * Which switch this port is a part of, and the port index
@@ -43,6 +51,7 @@ struct dsa_slave_priv { 
extern char dsa_driver_version[];



/* slave.c */

extern const struct dsa_device_ops notag_netdev_ops;

void dsa_slave_mii_bus_init(struct dsa_switch *ds);

struct net_device *dsa_slave_create(struct dsa_switch *ds,

				    struct device *parent,

net/dsa/slave.c

+15 −22
Original line number Diff line number Diff line
@@ -9,7 +9,6 @@ 
 */



#include <linux/list.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/phy.h>

#include <linux/of_net.h>
@@ -176,9 +175,8 @@ static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 
static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)

{

	struct dsa_slave_priv *p = netdev_priv(dev);

	struct dsa_switch_tree *dst = p->parent->dst;



	return dst->ops->xmit(skb, dev);

	return p->xmit(skb, dev);

}



static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
@@ -325,11 +323,6 @@ static const struct net_device_ops dsa_slave_netdev_ops = { 
	.ndo_do_ioctl		= dsa_slave_ioctl,

};



static const struct dsa_device_ops notag_netdev_ops = {

	.xmit	= dsa_slave_notag_xmit,

	.rcv	= NULL,

};



static void dsa_slave_adjust_link(struct net_device *dev)

{

	struct dsa_slave_priv *p = netdev_priv(dev);
@@ -435,41 +428,41 @@ dsa_slave_create(struct dsa_switch *ds, struct device *parent, 
	slave_dev->tx_queue_len = 0;

	slave_dev->netdev_ops = &dsa_slave_netdev_ops;



	SET_NETDEV_DEV(slave_dev, parent);

	slave_dev->dev.of_node = ds->pd->port_dn[port];

	slave_dev->vlan_features = master->vlan_features;



	p = netdev_priv(slave_dev);

	p->dev = slave_dev;

	p->parent = ds;

	p->port = port;



	switch (ds->dst->tag_protocol) {

#ifdef CONFIG_NET_DSA_TAG_DSA

	case DSA_TAG_PROTO_DSA:

		ds->dst->ops = &dsa_netdev_ops;

		p->xmit = dsa_netdev_ops.xmit;

		break;

#endif

#ifdef CONFIG_NET_DSA_TAG_EDSA

	case DSA_TAG_PROTO_EDSA:

		ds->dst->ops = &edsa_netdev_ops;

		p->xmit = edsa_netdev_ops.xmit;

		break;

#endif

#ifdef CONFIG_NET_DSA_TAG_TRAILER

	case DSA_TAG_PROTO_TRAILER:

		ds->dst->ops = &trailer_netdev_ops;

		p->xmit = trailer_netdev_ops.xmit;

		break;

#endif

#ifdef CONFIG_NET_DSA_TAG_BRCM

	case DSA_TAG_PROTO_BRCM:

		ds->dst->ops = &brcm_netdev_ops;

		p->xmit = brcm_netdev_ops.xmit;

		break;

#endif

	default:

		ds->dst->ops = &notag_netdev_ops;

		p->xmit	= dsa_slave_notag_xmit;

		break;

	}



	SET_NETDEV_DEV(slave_dev, parent);

	slave_dev->dev.of_node = ds->pd->port_dn[port];

	slave_dev->vlan_features = master->vlan_features;



	p = netdev_priv(slave_dev);

	p->dev = slave_dev;

	p->parent = ds;

	p->port = port;



	p->old_pause = -1;

	p->old_link = -1;

	p->old_duplex = -1;

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