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switchdev: Remove unused transaction item queue

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There are no more in tree users of the
switchdev_trans_item_{dequeue,enqueue} or switchdev_trans_item structure
in the kernel since commit 00fc0c51e3 ("rocker: Change world_ops API
and implementation to be switchdev independant").

Remove this unused code and update the documentation accordingly since.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2019-02-27 16:29:16 -08:00 • committed by David S. Miller
parent 9bfc445e0e
commit 91cf8eceff
3 changed files with 2 additions and 129 deletions
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19
Documentation/networking/switchdev.txt
View file

@ -371,22 +371,3 @@ 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 infrastructure 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.