Messages in this thread | | | Date | Sun, 13 Apr 2014 21:40:04 -0400 (EDT) | Subject | Re: [PATCH v2] tuntap: add flow control to support back pressure | From | David Miller <> |
| |
From: Steven Galgano <sgalgano@adjacentlink.com> Date: Sun, 13 Apr 2014 21:30:27 -0400
> Added optional per queue flow control support using IFF_FLOW_CONTROL. When the IFF_FLOW_CONTROL TUNSETIFF flag is specified it will set a per queue flag to indicate that the queue should be stopped using netif_tx_stop_queue(), rather than discarding frames once full. After reading a frame from the respective stopped queue, a netif_tx_wake_queue() is issued to signal resource availability. > > The per queue TUN_FLOW_CONTROL flag is stored in struct tun_file. This provides the flexibility to enable flow control on all, none or some queues when using IFF_MULTI_QUEUE. When not using IFF_MULTI_QUEUE, IFF_FLOW_CONTROL will apply to the single queue. No changes were made to the default drop frame policy. > > This change adds support for back pressure use cases. > > Reported-by: Brian Adamson <brian.adamson@nrl.navy.mil> > Tested-by: Joseph Giovatto <jgiovatto@djacentlink.com> > Signed-off-by: Steven Galgano <sgalgano@adjacentlink.com>
Please format your commit messages to ~80 columns of text.
It won't be automatically formatted by GIT and in fact it looks ugly with all the wrapping in text based tools.
| |