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Message-Id: <20210426170411.1789186-3-tobias@waldekranz.com>
Date: Mon, 26 Apr 2021 19:04:04 +0200
From: Tobias Waldekranz <tobias@...dekranz.com>
To: davem@...emloft.net, kuba@...nel.org
Cc: andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
olteanv@...il.com, roopa@...dia.com, nikolay@...dia.com,
jiri@...nulli.us, idosch@...sch.org, stephen@...workplumber.org,
netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: [RFC net-next 2/9] net: bridge: Disambiguate offload_fwd_mark
Before this change, four related - but distinct - concepts where named
offload_fwd_mark:
- skb->offload_fwd_mark: Set by the switchdev driver if the underlying
hardware has already forwarded this frame to the other ports in the
same hardware domain.
- nbp->offload_fwd_mark: An idetifier used to group ports that share
the same hardware forwarding domain.
- br->offload_fwd_mark: Counter used to make sure that unique IDs are
used in cases where a bridge contains ports from multiple hardware
domains.
- skb->cb->offload_fwd_mark: The hardware domain on which the frame
ingressed and was forwarded.
Introduce the term "hardware forwarding domain" ("hwdom") in the
bridge to denote a set of ports with the following property:
If an skb with skb->offload_fwd_mark set, is received on a port
belonging to hwdom N, that frame has already been forwarded to all
other ports in hwdom N.
By decoupling the name from "offload_fwd_mark", we can extend the
term's definition in the future - e.g. to add constraints that
describe expected egress behavior - without overloading the meaning of
"offload_fwd_mark".
- nbp->offload_fwd_mark thus becomes nbp->hwdom.
- br->offload_fwd_mark becomes br->last_hwdom.
- skb->cb->offload_fwd_mark becomes skb->cb->src_hwdom. There is a
slight change here: Whereas previously this was only set for
offloaded packets, we now always track the incoming hwdom. As all
uses where already gated behind checks of skb->offload_fwd_mark,
this will not introduce any functional change, but it paves the way
for future changes where the ingressing hwdom must be known both for
offloaded and non-offloaded frames.
Signed-off-by: Tobias Waldekranz <tobias@...dekranz.com>
---
net/bridge/br_if.c | 2 +-
net/bridge/br_private.h | 10 +++++-----
net/bridge/br_switchdev.c | 16 ++++++++--------
3 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index f7d2f472ae24..73fa703f8df5 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -643,7 +643,7 @@ int br_add_if(struct net_bridge *br, struct net_device *dev,
if (err)
goto err5;
- err = nbp_switchdev_mark_set(p);
+ err = nbp_switchdev_hwdom_set(p);
if (err)
goto err6;
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 7ce8a77cc6b6..53248715f631 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -327,7 +327,7 @@ struct net_bridge_port {
struct netpoll *np;
#endif
#ifdef CONFIG_NET_SWITCHDEV
- int offload_fwd_mark;
+ int hwdom;
#endif
u16 group_fwd_mask;
u16 backup_redirected_cnt;
@@ -472,7 +472,7 @@ struct net_bridge {
u32 auto_cnt;
#ifdef CONFIG_NET_SWITCHDEV
- int offload_fwd_mark;
+ int last_hwdom;
#endif
struct hlist_head fdb_list;
@@ -502,7 +502,7 @@ struct br_input_skb_cb {
#endif
#ifdef CONFIG_NET_SWITCHDEV
- int offload_fwd_mark;
+ int src_hwdom;
#endif
};
@@ -1593,7 +1593,7 @@ static inline void br_sysfs_delbr(struct net_device *dev) { return; }
/* br_switchdev.c */
#ifdef CONFIG_NET_SWITCHDEV
-int nbp_switchdev_mark_set(struct net_bridge_port *p);
+int nbp_switchdev_hwdom_set(struct net_bridge_port *p);
void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb);
bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
@@ -1613,7 +1613,7 @@ static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
skb->offload_fwd_mark = 0;
}
#else
-static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
+static inline int nbp_switchdev_hwdom_set(struct net_bridge_port *p)
{
return 0;
}
diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index a5e601e41cb9..bc085077ae71 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -8,20 +8,20 @@
#include "br_private.h"
-static int br_switchdev_mark_get(struct net_bridge *br, struct net_device *dev)
+static int br_switchdev_hwdom_get(struct net_bridge *br, struct net_device *dev)
{
struct net_bridge_port *p;
/* dev is yet to be added to the port list. */
list_for_each_entry(p, &br->port_list, list) {
if (netdev_port_same_parent_id(dev, p->dev))
- return p->offload_fwd_mark;
+ return p->hwdom;
}
- return ++br->offload_fwd_mark;
+ return ++br->last_hwdom;
}
-int nbp_switchdev_mark_set(struct net_bridge_port *p)
+int nbp_switchdev_hwdom_set(struct net_bridge_port *p)
{
struct netdev_phys_item_id ppid = { };
int err;
@@ -35,7 +35,7 @@ int nbp_switchdev_mark_set(struct net_bridge_port *p)
return err;
}
- p->offload_fwd_mark = br_switchdev_mark_get(p->br, p->dev);
+ p->hwdom = br_switchdev_hwdom_get(p->br, p->dev);
return 0;
}
@@ -43,15 +43,15 @@ int nbp_switchdev_mark_set(struct net_bridge_port *p)
void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
struct sk_buff *skb)
{
- if (skb->offload_fwd_mark && !WARN_ON_ONCE(!p->offload_fwd_mark))
- BR_INPUT_SKB_CB(skb)->offload_fwd_mark = p->offload_fwd_mark;
+ if (p->hwdom)
+ BR_INPUT_SKB_CB(skb)->src_hwdom = p->hwdom;
}
bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
const struct sk_buff *skb)
{
return !skb->offload_fwd_mark ||
- BR_INPUT_SKB_CB(skb)->offload_fwd_mark != p->offload_fwd_mark;
+ BR_INPUT_SKB_CB(skb)->src_hwdom != p->hwdom;
}
/* Flags that can be offloaded to hardware */
--
2.25.1
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