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switchdev: introduce transaction item queue for attr_set and obj_add

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Now, the memory allocation in prepare/commit state is done separatelly
in each driver (rocker). Introduce the similar mechanism in generic
switchdev code, in form of queue. That can be used not only for memory
allocations, but also for different items. Abort item destruction
is handled as well.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2015-09-24 10:02:41 +02:00
committed by David S. Miller
parent 69f5df491e
commit 7ea6eb3f56
5 changed files with 146 additions and 20 deletions
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19
Documentation/networking/switchdev.txt
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@@ -369,3 +369,22 @@ The driver can monitor for updates to arp_tbl using the netevent notifier
NETEVENT_NEIGH_UPDATE. The device can be programmed with resolved nexthops
for the routes as arp_tbl updates. The driver implements ndo_neigh_destroy
to know when arp_tbl neighbor entries are purged from the port.
Transaction item queue
^^^^^^^^^^^^^^^^^^^^^^
For switchdev ops attr_set and obj_add, there is a 2 phase transaction model
used. First phase is to "prepare" anything needed, including various checks,
memory allocation, etc. The goal is to handle the stuff that is not unlikely
to fail here. The second phase is to "commit" the actual changes.
Switchdev provides an inftrastructure for sharing items (for example memory
allocations) between the two phases.
The object created by a driver in "prepare" phase and it is queued up by:
switchdev_trans_item_enqueue()
During the "commit" phase, the driver gets the object by:
switchdev_trans_item_dequeue()
If a transaction is aborted during "prepare" phase, switchdev code will handle
cleanup of the queued-up objects.