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authorJiri Pirko <jiri@mellanox.com>2016-09-26 13:52:34 +0300
committerDavid S. Miller <davem@davemloft.net>2016-09-28 11:48:00 +0300
commitfd41b0eaa06a8a0516f9e0b0a5889035bf423784 (patch)
treebdd2565cbf373e53c32a47ff30c11e4de0028ce7 /Documentation/networking
parent347e3b28c1ba24c1ae2f30290d8247480ab9ce14 (diff)
downloadlinux-fd41b0eaa06a8a0516f9e0b0a5889035bf423784.tar.xz
doc: update switchdev L3 section
This is to reflect the change of FIB offload infrastructure from switchdev objects to FIB notifier. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/switchdev.txt27
1 files changed, 14 insertions, 13 deletions
diff --git a/Documentation/networking/switchdev.txt b/Documentation/networking/switchdev.txt
index 44235e83799b..2bbac05ab9e2 100644
--- a/Documentation/networking/switchdev.txt
+++ b/Documentation/networking/switchdev.txt
@@ -314,30 +314,29 @@ the kernel, with the device doing the FIB lookup and forwarding. The device
does a longest prefix match (LPM) on FIB entries matching route prefix and
forwards the packet to the matching FIB entry's nexthop(s) egress ports.
-To program the device, the driver implements support for
-SWITCHDEV_OBJ_IPV[4|6]_FIB object using switchdev_port_obj_xxx ops.
-switchdev_port_obj_add is used for both adding a new FIB entry to the device,
-or modifying an existing entry on the device.
+To program the device, the driver has to register a FIB notifier handler
+using register_fib_notifier. The following events are available:
+FIB_EVENT_ENTRY_ADD: used for both adding a new FIB entry to the device,
+ or modifying an existing entry on the device.
+FIB_EVENT_ENTRY_DEL: used for removing a FIB entry
+FIB_EVENT_RULE_ADD, FIB_EVENT_RULE_DEL: used to propagate FIB rule changes
-XXX: Currently, only SWITCHDEV_OBJ_ID_IPV4_FIB objects are supported.
+FIB_EVENT_ENTRY_ADD and FIB_EVENT_ENTRY_DEL events pass:
-SWITCHDEV_OBJ_ID_IPV4_FIB object passes:
-
- struct switchdev_obj_ipv4_fib { /* IPV4_FIB */
+ struct fib_entry_notifier_info {
+ struct fib_notifier_info info; /* must be first */
u32 dst;
int dst_len;
struct fib_info *fi;
u8 tos;
u8 type;
- u32 nlflags;
u32 tb_id;
- } ipv4_fib;
+ u32 nlflags;
+ };
to add/modify/delete IPv4 dst/dest_len prefix on table tb_id. The *fi
structure holds details on the route and route's nexthops. *dev is one of the
-port netdevs mentioned in the routes next hop list. If the output port netdevs
-referenced in the route's nexthop list don't all have the same switch ID, the
-driver is not called to add/modify/delete the FIB entry.
+port netdevs mentioned in the route's next hop list.
Routes offloaded to the device are labeled with "offload" in the ip route
listing:
@@ -355,6 +354,8 @@ listing:
12.0.0.4 via 11.0.0.9 dev sw1p2 proto zebra metric 20 offload
192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.15
+The "offload" flag is set in case at least one device offloads the FIB entry.
+
XXX: add/mod/del IPv6 FIB API
Nexthop Resolution