Add vlan priority check to the flow dissector by adding new flow
dissector struct, flow_dissector_key_vlan which includes vlan tag
fields.
vlan_id and flow_label fields were under the same struct
(flow_dissector_key_tags). It was a convenient setting since struct
flow_dissector_key_tags is used by struct flow_keys and by setting
vlan_id and flow_label under the same struct, we get precisely 24 or 48
bytes in flow_keys from flow_dissector_key_basic.
Now, when adding vlan priority support, the code will be cleaner if
flow_label and vlan tag won't be under the same struct anymore.
Signed-off-by: Hadar Hen Zion <had...@mellanox.com>
---
include/linux/if_vlan.h | 1 +
include/net/flow_dissector.h | 12 +++++++++---
net/core/flow_dissector.c | 25 ++++++++++++++++---------
3 files changed, 26 insertions(+), 12 deletions(-)
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index a5f6ce6..49d4aef 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -81,6 +81,7 @@ static inline bool is_vlan_dev(const struct net_device *dev)
#define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci &
~VLAN_TAG_PRESENT)
#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
+#define skb_vlan_tag_get_prio(__skb) ((__skb)->vlan_tci & VLAN_PRIO_MASK)
/**
* struct vlan_pcpu_stats - VLAN percpu rx/tx stats
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index d3d60dc..f266b51 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -32,8 +32,13 @@ struct flow_dissector_key_basic {
};
struct flow_dissector_key_tags {
- u32 vlan_id:12,
- flow_label:20;
+ u32 flow_label;
+};
+
+struct flow_dissector_key_vlan {
+ u16 vlan_id:12,
+ vlan_priority:3;
+ u16 padding;
};
struct flow_dissector_key_keyid {
@@ -119,7 +124,7 @@ enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs
*/
- FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
+ FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_flow_vlan */
FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_tags */
FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */
FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */
@@ -148,6 +153,7 @@ struct flow_keys {
#define FLOW_KEYS_HASH_START_FIELD basic
struct flow_dissector_key_basic basic;
struct flow_dissector_key_tags tags;
+ struct flow_dissector_key_vlan vlan;
struct flow_dissector_key_keyid keyid;
struct flow_dissector_key_ports ports;
struct flow_dissector_key_addrs addrs;
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 362d693..a2879c0 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -118,6 +118,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
struct flow_dissector_key_addrs *key_addrs;
struct flow_dissector_key_ports *key_ports;
struct flow_dissector_key_tags *key_tags;
+ struct flow_dissector_key_vlan *key_vlan;
struct flow_dissector_key_keyid *key_keyid;
bool skip_vlan = false;
u8 ip_proto = 0;
@@ -266,16 +267,22 @@ ipv6:
skip_vlan = true;
if (dissector_uses_key(flow_dissector,
- FLOW_DISSECTOR_KEY_VLANID)) {
- key_tags = skb_flow_dissector_target(flow_dissector,
-
FLOW_DISSECTOR_KEY_VLANID,
+ FLOW_DISSECTOR_KEY_VLAN)) {
+ key_vlan = skb_flow_dissector_target(flow_dissector,
+
FLOW_DISSECTOR_KEY_VLAN,
target_container);
- if (skb_vlan_tag_present(skb))
- key_tags->vlan_id = skb_vlan_tag_get_id(skb);
- else
- key_tags->vlan_id = ntohs(vlan->h_vlan_TCI) &
+ if (skb_vlan_tag_present(skb)) {
+ key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
+ key_vlan->vlan_priority =
+ (skb_vlan_tag_get_prio(skb) >>
VLAN_PRIO_SHIFT);
+ } else {
+ key_vlan->vlan_id = ntohs(vlan->h_vlan_TCI) &
VLAN_VID_MASK;
+ key_vlan->vlan_priority =
+ (ntohs(vlan->h_vlan_TCI) &
+ VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+ }
}
goto again;
@@ -935,8 +942,8 @@ static const struct flow_dissector_key
flow_keys_dissector_keys[] = {
.offset = offsetof(struct flow_keys, ports),
},
{
- .key_id = FLOW_DISSECTOR_KEY_VLANID,
- .offset = offsetof(struct flow_keys, tags),
+ .key_id = FLOW_DISSECTOR_KEY_VLAN,
+ .offset = offsetof(struct flow_keys, vlan),
},
{
.key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL,
--
1.8.3.1
