6.12-stable review patch. If anyone has any objections, please let me know.
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From: Vladimir Oltean vladimir.oltean@nxp.com
[ Upstream commit 30296ac7642652428396222e720718f2661e9425 ]
As discussed here: https://lore.kernel.org/netdev/20240620090210.drop6jwh7e5qw556@skbuf/
the fact is that the xrs700x.c driver only supports offloading HSR_PT_SLAVE_A and HSR_PT_SLAVE_B (which were the only port types at the time the offload was written, _for this driver_).
Up until now, the API did not explicitly tell offloading drivers what port has what role. So xrs700x can get confused and think that it can support a configuration which it actually can't. There was a table in the attached link which gave an example:
$ ip link add name hsr0 type hsr slave1 swp0 slave2 swp1 \ interlink swp2 supervision 45 version 1
HSR_PT_SLAVE_A HSR_PT_SLAVE_B HSR_PT_INTERLINK ---------------------------------------------------------------- user space 0 1 2 requests ---------------------------------------------------------------- XRS700X driver 1 2 - understands
The switch would act as if the ring ports were swp1 and swp2.
Now that we have explicit hsr_get_port_type() API, let's use that to work around the unintended semantical changes of the offloading API brought by the introduction of interlink ports in HSR.
Fixes: 5055cccfc2d1 ("net: hsr: Provide RedBox support (HSR-SAN)") Cc: Lukasz Majewski lukma@denx.de Signed-off-by: Vladimir Oltean vladimir.oltean@nxp.com Reviewed-by: George McCollister george.mccollister@gmail.com Link: https://patch.msgid.link/20251130131657.65080-5-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/dsa/xrs700x/xrs700x.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/net/dsa/xrs700x/xrs700x.c b/drivers/net/dsa/xrs700x/xrs700x.c index de3b768f2ff9c..7e9a2ba6bfd95 100644 --- a/drivers/net/dsa/xrs700x/xrs700x.c +++ b/drivers/net/dsa/xrs700x/xrs700x.c @@ -568,6 +568,7 @@ static int xrs700x_hsr_join(struct dsa_switch *ds, int port, struct xrs700x *priv = ds->priv; struct net_device *user; int ret, i, hsr_pair[2]; + enum hsr_port_type type; enum hsr_version ver; bool fwd = false;
@@ -591,6 +592,16 @@ static int xrs700x_hsr_join(struct dsa_switch *ds, int port, return -EOPNOTSUPP; }
+ ret = hsr_get_port_type(hsr, dsa_to_port(ds, port)->user, &type); + if (ret) + return ret; + + if (type != HSR_PT_SLAVE_A && type != HSR_PT_SLAVE_B) { + NL_SET_ERR_MSG_MOD(extack, + "Only HSR slave ports can be offloaded"); + return -EOPNOTSUPP; + } + dsa_hsr_foreach_port(dp, ds, hsr) { if (dp->index != port) { partner = dp;