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authorVladimir Oltean <vladimir.oltean@nxp.com>2021-01-29 03:00:09 +0200
committerJakub Kicinski <kuba@kernel.org>2021-01-29 21:25:27 -0800
commite21268efbe26d9ab3f7468577d691b992d76e06a (patch)
treeaa4cb0149150ca9ac46ca5a01444572f5e8373ab /drivers/net/dsa/ocelot/felix.h
parent7c83a7c539abe9f980996063ac20532a7a7f6eb1 (diff)
net: dsa: felix: perform switch setup for tag_8021q
Unlike sja1105, the only other user of the software-defined tag_8021q.c tagger format, the implementation we choose for the Felix DSA switch driver preserves full functionality under a vlan_filtering bridge (i.e. IP termination works through the DSA user ports under all circumstances). The tag_8021q protocol just wants: - Identifying the ingress switch port based on the RX VLAN ID, as seen by the CPU. We achieve this by using the TCAM engines (which are also used for tc-flower offload) to push the RX VLAN as a second, outer tag, on egress towards the CPU port. - Steering traffic injected into the switch from the network stack towards the correct front port based on the TX VLAN, and consuming (popping) that header on the switch's egress. A tc-flower pseudocode of the static configuration done by the driver would look like this: $ tc qdisc add dev <cpu-port> clsact $ for eth in swp0 swp1 swp2 swp3; do \ tc filter add dev <cpu-port> egress flower indev ${eth} \ action vlan push id <rxvlan> protocol 802.1ad; \ tc filter add dev <cpu-port> ingress protocol 802.1Q flower vlan_id <txvlan> action vlan pop \ action mirred egress redirect dev ${eth}; \ done but of course since DSA does not register network interfaces for the CPU port, this configuration would be impossible for the user to do. Also, due to the same reason, it is impossible for the user to inadvertently delete these rules using tc. These rules do not collide in any way with tc-flower, they just consume some TCAM space, which is something we can live with. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/dsa/ocelot/felix.h')
-rw-r--r--drivers/net/dsa/ocelot/felix.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
index 264b3bbdc4d1..9d4459f2fffb 100644
--- a/drivers/net/dsa/ocelot/felix.h
+++ b/drivers/net/dsa/ocelot/felix.h
@@ -48,6 +48,7 @@ struct felix {
struct lynx_pcs **pcs;
resource_size_t switch_base;
resource_size_t imdio_base;
+ struct dsa_8021q_context *dsa_8021q_ctx;
enum dsa_tag_protocol tag_proto;
};