Re: [dpdk-dev] [RFC PATCH] ethdev: add a new flow action of queue range

[Andrew Rybchenko <arybchenko@solarflare.com>]

On 7/17/20 12:32 PM, Wei Hu (Xavier) wrote:
> From: Chengwen Feng <fengchengwen@huawei.com>
> 
> This patch adds a new flow action of queue range, which was used to assign
> packets to a continuous queue range.
> 
> Current FD (flow director) provide a useful means to assign packets to
> a target queue. But it has the following shortage: it can only route
> to one queue, and there is an upper limit on one queue rxtx capacity,
> which means the FD rule need more accurate else it may exceed the
> queue capacity.
> 
> With the support of queue range action, user can create FD rule with
> action routed to a continuous queues, like:
> 	FD rule 0 ------|-----> queue 0
> 			|-----> queue 1
> 
> 	FD rule 1 ------|-----> queue 8
> 			|-----> queue 9
> 			|-----> queue 10
> 			|-----> queue 11
> Note: hardware can use RSS to distribute traffic to the continuous queues
> when packets match the above FD rule.
> 
> With the support of queue range action, we can further provide QoS
> service when DCB disabled.
> eg: one NE (network element) is configured with two ip addresses, one for
> control plane and the other for data plane, user can create two FD rules,
> the first for directing control plane packets to queue 0, the second for
> directing data plane packets to queue 1~15.

I don't understand why it is not covered by RSS action.

> 
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>

[snip]