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net: dsa: Refactor selection of tag ops into a function

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Replace the two switch statements with an array lookup, and store the
result in the dsa tree structure. The drivers no longer need to know
the selected tag protocol, so remove it from the dsa switch structure.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2016-06-04 21:17:03 +02:00 committed by David S. Miller
parent 5377b802fc
commit 39a7f2a4eb
4 changed files with 54 additions and 61 deletions
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8
include/net/dsa.h
View File

@ -26,6 +26,7 @@ enum dsa_tag_protocol {
DSA_TAG_PROTO_TRAILER,
DSA_TAG_PROTO_EDSA,
DSA_TAG_PROTO_BRCM,
DSA_TAG_LAST, /* MUST BE LAST */
};
#define DSA_MAX_SWITCHES 4
@ -99,7 +100,6 @@ struct dsa_switch_tree {
struct net_device *dev,
struct packet_type *pt,
struct net_device *orig_dev);
enum dsa_tag_protocol tag_protocol;
/*
* Original copy of the master netdev ethtool_ops
@ -116,6 +116,12 @@ struct dsa_switch_tree {
* Data for the individual switch chips.
*/
struct dsa_switch *ds[DSA_MAX_SWITCHES];
/*
* Tagging protocol operations for adding and removing an
* encapsulation tag.
*/
const struct dsa_device_ops *tag_ops;
};
struct dsa_port {

71
net/dsa/dsa.c
View File

@ -29,6 +29,33 @@
char dsa_driver_version[] = "0.1";
static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
struct net_device *dev)
{
/* Just return the original SKB */
return skb;
}
static const struct dsa_device_ops none_ops = {
.xmit = dsa_slave_notag_xmit,
.rcv = NULL,
};
const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
#ifdef CONFIG_NET_DSA_TAG_DSA
[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
#endif
#ifdef CONFIG_NET_DSA_TAG_BRCM
[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
#endif
[DSA_TAG_PROTO_NONE] = &none_ops,
};
/* switch driver registration ***********************************************/
static DEFINE_MUTEX(dsa_switch_drivers_mutex);
@ -225,6 +252,20 @@ static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
return 0;
}
const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
{
const struct dsa_device_ops *ops;
if (tag_protocol >= DSA_TAG_LAST)
return ERR_PTR(-EINVAL);
ops = dsa_device_ops[tag_protocol];
if (!ops)
return ERR_PTR(-ENOPROTOOPT);
return ops;
}
static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
{
struct dsa_switch_driver *drv = ds->drv;
@ -277,35 +318,13 @@ static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
* switch.
*/
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
case DSA_TAG_PROTO_NONE:
break;
default:
ret = -ENOPROTOOPT;
dst->tag_ops = dsa_resolve_tag_protocol(drv->tag_protocol);
if (IS_ERR(dst->tag_ops)) {
ret = PTR_ERR(dst->tag_ops);
goto out;
}
dst->tag_protocol = drv->tag_protocol;
dst->rcv = dst->tag_ops->rcv;
}
memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));

1
net/dsa/dsa_priv.h
View File

@ -53,6 +53,7 @@ extern char dsa_driver_version[];
int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
struct device_node *port_dn, int port);
void dsa_cpu_dsa_destroy(struct device_node *port_dn);
const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol);
/* slave.c */
extern const struct dsa_device_ops notag_netdev_ops;

35
net/dsa/slave.c
View File

@ -521,14 +521,6 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
}
static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
struct net_device *dev)
{
/* Just return the original SKB */
return skb;
}
/* ethtool operations *******************************************************/
static int
dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
@ -1151,32 +1143,7 @@ int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
p = netdev_priv(slave_dev);
p->parent = ds;
p->port = port;
switch (ds->dst->tag_protocol) {
#ifdef CONFIG_NET_DSA_TAG_DSA
case DSA_TAG_PROTO_DSA:
p->xmit = dsa_netdev_ops.xmit;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
case DSA_TAG_PROTO_EDSA:
p->xmit = edsa_netdev_ops.xmit;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
case DSA_TAG_PROTO_TRAILER:
p->xmit = trailer_netdev_ops.xmit;
break;
#endif
#ifdef CONFIG_NET_DSA_TAG_BRCM
case DSA_TAG_PROTO_BRCM:
p->xmit = brcm_netdev_ops.xmit;
break;
#endif
default:
p->xmit = dsa_slave_notag_xmit;
break;
}
p->xmit = dst->tag_ops->xmit;
p->old_pause = -1;
p->old_link = -1;