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

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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: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2014-09-15 13:00:19 -04:00 • committed by David S. Miller
parent 6cca9adb78
commit 5075314e4e
9 changed files with 71 additions and 54 deletions
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32
net/dsa/dsa.c
View file

@ -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 = {