netdev - Re: [PATCH net-next 0/4] xps_flows: XPS flow steering when there is no socket

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Date:   Thu, 1 Sep 2016 12:32:03 -0700
From:   Tom Herbert <tom@...bertland.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Kernel Team <kernel-team@...com>,
        Rick Jones <rick.jones2@....com>
Subject: Re: [PATCH net-next 0/4] xps_flows: XPS flow steering when there is
 no socket

On Thu, Sep 1, 2016 at 12:25 PM, Florian Fainelli <f.fainelli@...il.com> wrote:
> On 08/31/2016 05:10 PM, Tom Herbert wrote:
>> This patch set introduces transmit flow steering for socketless packets.
>> The idea is that we record the transmit queues in a flow table that is
>> indexed by skbuff hash.  The flow table entries have two values: the
>> queue_index and the head cnt of packets from the TX queue. We only allow
>> a queue to change for a flow if the tail cnt in the TX queue advances
>> beyond the recorded head cnt. That is the condition that should indicate
>> that all outstanding packets for the flow have completed transmission so
>> the queue can change.
>>
>> Tracking the inflight queue is performed as part of DQL. Two fields are
>> added to the dql structure: num_enqueue_ops and num_completed_ops.
>> num_enqueue_ops incremented in dql_queued and num_completed_ops is
>> incremented in dql_completed by the number of operations completed (an
>> new argument to the function).
>>
>> This patch set creates /sys/class/net/eth*/xps_dev_flow_table_cnt
>> which number of entries in the XPS flow table.
>
> If you respin, do you mind updating the sysfs documentation at
> Documentation/ABI/testing/sysfs-class-net-queues with the new entries
> you are adding? Thanks!

There are no per-queue sysfs entries being added.

Tom

> --
> Florian