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authorVladimir Oltean <vladimir.oltean@nxp.com>2021-01-29 03:00:05 +0200
committerJakub Kicinski <kuba@kernel.org>2021-01-29 21:24:31 -0800
commit357f203bb3b529fa7471494c7ad6a7a54d070353 (patch)
tree6d735f8f187ee925ae9a2ffb53c6c20f68096ecf /include
parent886f8e26f5397827f031bce48f3138040d88ffb3 (diff)
net: dsa: keep a copy of the tagging protocol in the DSA switch tree
Cascading DSA switches can be done multiple ways. There is the brute force approach / tag stacking, where one upstream switch, located between leaf switches and the host Ethernet controller, will just happily transport the DSA header of those leaf switches as payload. For this kind of setups, DSA works without any special kind of treatment compared to a single switch - they just aren't aware of each other. Then there's the approach where the upstream switch understands the tags it transports from its leaves below, as it doesn't push a tag of its own, but it routes based on the source port & switch id information present in that tag (as opposed to DMAC & VID) and it strips the tag when egressing a front-facing port. Currently only Marvell implements the latter, and Marvell DSA trees contain only Marvell switches. So it is safe to say that DSA trees already have a single tag protocol shared by all switches, and in fact this is what makes the switches able to understand each other. This fact is also implied by the fact that currently, the tagging protocol is reported as part of a sysfs installed on the DSA master and not per port, so it must be the same for all the ports connected to that DSA master regardless of the switch that they belong to. It's time to make this official and enforce it (yes, this also means we won't have any "switch understands tag to some extent but is not able to speak it" hardware oddities that we'll support in the future). This is needed due to the imminent introduction of the dsa_switch_ops:: change_tag_protocol driver API. When that is introduced, we'll have to notify switches of the tagging protocol that they're configured to use. Currently the tag_ops structure pointer is held only for CPU ports. But there are switches which don't have CPU ports and nonetheless still need to be configured. These would be Marvell leaf switches whose upstream port is just a DSA link. How do we inform these of their tagging protocol setup/deletion? One answer to the above would be: iterate through the DSA switch tree's ports once, list the CPU ports, get their tag_ops, then iterate again now that we have it, and notify everybody of that tag_ops. But what to do if conflicts appear between one cpu_dp->tag_ops and another? There's no escaping the fact that conflict resolution needs to be done, so we can be upfront about it. Ease our work and just keep the master copy of the tag_ops inside the struct dsa_switch_tree. Reference counting is now moved to be per-tree too, instead of per-CPU port. There are many places in the data path that access master->dsa_ptr->tag_ops and we would introduce unnecessary performance penalty going through yet another indirection, so keep those right where they are. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/net/dsa.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 2f5435d3d1db..b8af1d6c879a 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -140,6 +140,9 @@ struct dsa_switch_tree {
/* Has this tree been applied to the hardware? */
bool setup;
+ /* Tagging protocol operations */
+ const struct dsa_device_ops *tag_ops;
+
/*
* Configuration data for the platform device that owns
* this dsa switch tree instance.
@@ -225,7 +228,9 @@ struct dsa_port {
struct net_device *slave;
};
- /* CPU port tagging operations used by master or slave devices */
+ /* Copy of the tagging protocol operations, for quicker access
+ * in the data path. Valid only for the CPU ports.
+ */
const struct dsa_device_ops *tag_ops;
/* Copies for faster access in master receive hot path */