netdev - Re: [PATCH net-next 0/7] mlxsw: Use page pool for Rx buffers allocation

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Date: Tue, 18 Jun 2024 16:01:17 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Petr Machata <petrm@...dia.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, Ido Schimmel <idosch@...dia.com>,
	Amit Cohen <amcohen@...dia.com>, mlxsw@...dia.com
Subject: Re: [PATCH net-next 0/7] mlxsw: Use page pool for Rx buffers
 allocation

Tue, Jun 18, 2024 at 01:34:39PM CEST, petrm@...dia.com wrote:
>Amit Cohen  writes:
>
>After using NAPI to process events from hardware, the next step is to
>use page pool for Rx buffers allocation, which is also enhances
>performance.
>
>To simplify this change, first use page pool to allocate one continuous
>buffer for each packet, later memory consumption can be improved by using
>fragmented buffers.
>
>This set significantly enhances mlxsw driver performance, CPU can handle
>about 370% of the packets per second it previously handled.
>
>The next planned improvement is using XDP to optimize telemetry.
>
>Patch set overview:
>Patches #1-#2 are small preparations for page pool usage
>Patch #3 initializes page pool, but do not use it
>Patch #4 converts the driver to use page pool for buffers allocations
>Patch #5 is an optimization for buffer access
>Patch #6 cleans up an unused structure
>Patch #7 uses napi_consume_skb() as part of Tx completion
>
>Amit Cohen (7):
>  mlxsw: pci: Split NAPI setup/teardown into two steps
>  mlxsw: pci: Store CQ pointer as part of RDQ structure
>  mlxsw: pci: Initialize page pool per CQ
>  mlxsw: pci: Use page pool for Rx buffers allocation
>  mlxsw: pci: Optimize data buffer access
>  mlxsw: pci: Do not store SKB for RDQ elements
>  mlxsw: pci: Use napi_consume_skb() to free SKB as part of Tx
>    completion

set-
Reviewed-by: Jiri Pirko <jiri@...dia.com>