net: ethtool: Allow matching on vlan DEI bit

Using ethtool, users can specify a classification action matching on the
full vlan tag, which includes the DEI bit (also previously called CFI).

However, when converting the ethool_flow_spec to a flow_rule, we use
dissector keys to represent the matching patterns.

Since the vlan dissector key doesn't include the DEI bit, this
information was silently discarded when translating the ethtool
flow spec in to a flow_rule.

This commit adds the DEI bit into the vlan dissector key, and allows
propagating the information to the driver when parsing the ethtool flow
spec.

Fixes: eca4205f9ec3 ("ethtool: add ethtool_rx_flow_spec to flow_rule structure translator")
Reported-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 7c5a8d9..dfabc05 100644 (file)
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -46,6 +46,7 @@ struct flow_dissector_key_tags {
 
 struct flow_dissector_key_vlan {
        u16     vlan_id:12,
+               vlan_dei:1,
                vlan_priority:3;
        __be16  vlan_tpid;
 };

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index d08b1e1..4d1011b 100644 (file)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -3020,6 +3020,11 @@ ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
                        match->mask.vlan.vlan_id =
                                ntohs(ext_m_spec->vlan_tci) & 0x0fff;
 
+                       match->key.vlan.vlan_dei =
+                               !!(ext_h_spec->vlan_tci & htons(0x1000));
+                       match->mask.vlan.vlan_dei =
+                               !!(ext_m_spec->vlan_tci & htons(0x1000));
+
                        match->key.vlan.vlan_priority =
                                (ntohs(ext_h_spec->vlan_tci) & 0xe000) >> 13;
                        match->mask.vlan.vlan_priority =