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authorVladimir Oltean <vladimir.oltean@nxp.com>2021-09-22 17:37:26 +0300
committerJakub Kicinski <kuba@kernel.org>2021-10-13 03:33:36 +0300
commit4ac0567e40b334b54988e3c28a2425ff9c8bdd35 (patch)
treea3a6424c16ef530241768d35ba9a44c97707cc1f
parent28da0555c3b542d605e4ca26eea6a740cf2c9174 (diff)
downloadlinux-4ac0567e40b334b54988e3c28a2425ff9c8bdd35.tar.xz
net: dsa: sja1105: break dependency between dsa_port_is_sja1105 and switch driver
It's nice to be able to test a tagging protocol with dsa_loop, but not at the cost of losing the ability of building the tagging protocol and switch driver as modules, because as things stand, there is a circular dependency between the two. Tagging protocol drivers cannot depend on switch drivers, that is a hard fact. The reasoning behind the blamed patch was that accessing dp->priv should first make sure that the structure behind that pointer is what we really think it is. Currently the "sja1105" and "sja1110" tagging protocols only operate with the sja1105 switch driver, just like any other tagging protocol and switch combination. The only way to mix and match them is by modifying the code, and this applies to dsa_loop as well (by default that uses DSA_TAG_PROTO_NONE). So while in principle there is an issue, in practice there isn't one. Until we extend dsa_loop to allow user space configuration, treat the problem as a non-issue and just say that DSA ports found by tag_sja1105 are always sja1105 ports, which is in fact true. But keep the dsa_port_is_sja1105 function so that it's easy to patch it during testing, and rely on dead code elimination. Fixes: 994d2cbb08ca ("net: dsa: tag_sja1105: be dsa_loop-safe") Link: https://lore.kernel.org/netdev/20210908220834.d7gmtnwrorhharna@skbuf/ Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
-rw-r--r--drivers/net/dsa/sja1105/sja1105_main.c3
-rw-r--r--include/linux/dsa/sja1105.h15
-rw-r--r--net/dsa/Kconfig1
3 files changed, 2 insertions, 17 deletions
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 7c0db80eff00..924c3f129992 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -3117,7 +3117,7 @@ static void sja1105_teardown(struct dsa_switch *ds)
sja1105_static_config_free(&priv->static_config);
}
-const struct dsa_switch_ops sja1105_switch_ops = {
+static const struct dsa_switch_ops sja1105_switch_ops = {
.get_tag_protocol = sja1105_get_tag_protocol,
.setup = sja1105_setup,
.teardown = sja1105_teardown,
@@ -3166,7 +3166,6 @@ const struct dsa_switch_ops sja1105_switch_ops = {
.port_bridge_tx_fwd_offload = dsa_tag_8021q_bridge_tx_fwd_offload,
.port_bridge_tx_fwd_unoffload = dsa_tag_8021q_bridge_tx_fwd_unoffload,
};
-EXPORT_SYMBOL_GPL(sja1105_switch_ops);
static const struct of_device_id sja1105_dt_ids[];
diff --git a/include/linux/dsa/sja1105.h b/include/linux/dsa/sja1105.h
index 0485ab2fcc46..9e07079528a5 100644
--- a/include/linux/dsa/sja1105.h
+++ b/include/linux/dsa/sja1105.h
@@ -88,22 +88,9 @@ static inline s64 sja1105_ticks_to_ns(s64 ticks)
return ticks * SJA1105_TICK_NS;
}
-#if IS_ENABLED(CONFIG_NET_DSA_SJA1105)
-
-extern const struct dsa_switch_ops sja1105_switch_ops;
-
-static inline bool dsa_port_is_sja1105(struct dsa_port *dp)
-{
- return dp->ds->ops == &sja1105_switch_ops;
-}
-
-#else
-
static inline bool dsa_port_is_sja1105(struct dsa_port *dp)
{
- return false;
+ return true;
}
-#endif
-
#endif /* _NET_DSA_SJA1105_H */
diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index 548285539752..bca1b5d66df2 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -138,7 +138,6 @@ config NET_DSA_TAG_LAN9303
config NET_DSA_TAG_SJA1105
tristate "Tag driver for NXP SJA1105 switches"
- depends on NET_DSA_SJA1105 || !NET_DSA_SJA1105
select PACKING
help
Say Y or M if you want to enable support for tagging frames with the