netdev - Re: [PATCH v3 00/17] stmmac: enhance driver performances and update the version

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Date:	Mon, 29 Feb 2016 15:19:56 +0100
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	Alexandre TORGUE <alexandre.torgue@...com>,
	<netdev@...r.kernel.org>
CC:	<fabrice.gasnier@...com>, <maxime.coquelin@...com>
Subject: Re: [PATCH v3 00/17] stmmac: enhance driver performances and update
 the version

Thanks a lot Alex for this and for the next development needed
to enhance the stmmac to support new chips etc.

Peppe

On 2/29/2016 2:27 PM, Alexandre TORGUE wrote:
> According to Giuseppe, I send the v3 series.
>
> This is a subset of patches to rework the driver in order to improve its
> performances and make it more robust under stress conditions.
>
> All patches have been ported on STi mainstream kernel branch and
> tested on ARM STiH4xx platforms and newer ones.
>
> This series also updates the driver version and prepares it
> to include further development to support new chips.
>
> In detail, these patches are:
>
> o to rework and improve the internal DMA bus settings
>
>    Fine tuning is mandatory on some platforms for both
>    performance and stability issues.
>
> o to rework and optimize the descriptor management.
>
>    This will help a lot on performance side and preparing
>    the inclusion on the GMAC4.x.
>
> o to add a set of optimizations for both xmit and rx functions.
>
>    These will help a lot on performance side and making the driver
>    more robust in case of low memory conditions and under some
>    stress test, performed for example on IP-STB.
>
> Below some throughput figures obtained on some boxes before and after
> the patches.
>
>                         nuttcp (mbps)       iperf (Mbps)
> ------------------------------------------------------------------
>                        tcp     udp          tcp      udp
>                     tx   rx   tx  rx      tx   rx   tx  rx
>                      ------------------------------------------
>     old             680   800 480  506    760  800   600  700
>     new             830   880 540  630    840  880   700   800
>
> ==============================================================================
>
> V2: - rx_copybreak is now managed by using ethtool.
> V3: - improve comments on PCIe detailing that there are no regressions
>      - rework some APIs to properly define some params as bool as expected
>      - rework the formula to get the element inside the ring. Comparing V2,
> 	patches 4 and 13 have been merged because the same formula have been
> 	used. After this rework, no evident benefit has been noticed in terms
> 	of performances so the table above is still valid. Disassembling the
> 	code for SH4 and ARM, with the new formula just an instr is saved
> 	(depending on compiler flags) and this gives us not so relevanti gain,
> 	for example, on SH4 where some instr are executed in the same pipeline
> 	stage.
> 	Ring sizes are now fixed and maybe they can be reworked to be tuned
> 	w/o using stmmaceth= cmdline option. Indeed, nobody change these sizes
> 	and indeed the numbers selected by default respect the budget and
> 	avoid to pass invalid setup. These are the best driver default sizes
> 	for ring and chain.
>
> ==============================================================================
> Fabrice Gasnier (3):
>    stmmac: merge get_rx_owner into rx_status routine.
>    stmmac: optimize tx clean function
>    stmmac: fix phy init when attached to a phy
>
> Giuseppe Cavallaro (14):
>    stmmac: share reset function between dwmac100 and dwmac1000
>    stmmac: rework DMA bus setting and introduce new platform AXI
>      structure
>    stmmac: change descriptor layout
>    stmmac: review RX/TX ring management
>    stmmac: add length field to dma data
>    stmmac: add last_segment field to dma data
>    stmmac: add is_jumbo field to dma data
>    stmmac: optimize tx desc management
>    stmmac: set dirty index out of the loop
>    stmmac: first frame prep at the end of xmit routine
>    stmmac: do not poll phy handler when attach a switch
>    stmmac: do not perform zero-copy for rx frames
>    stmmac: tune rx copy via threshold.
>    stmmac: update version to Oct_2015
>
>   Documentation/devicetree/bindings/net/stmmac.txt   |  54 ++-
>   drivers/net/ethernet/stmicro/stmmac/chain_mode.c   |  37 +-
>   drivers/net/ethernet/stmicro/stmmac/common.h       |  39 +-
>   drivers/net/ethernet/stmicro/stmmac/descs.h        | 330 +++++++-------
>   drivers/net/ethernet/stmicro/stmmac/descs_com.h    |  77 ++--
>   drivers/net/ethernet/stmicro/stmmac/dwmac100.h     |   1 -
>   drivers/net/ethernet/stmicro/stmmac/dwmac1000.h    |   3 +-
>   .../net/ethernet/stmicro/stmmac/dwmac1000_dma.c    | 111 +++--
>   drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c |  22 +-
>   drivers/net/ethernet/stmicro/stmmac/dwmac_dma.h    |  39 +-
>   drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c    |  21 +
>   drivers/net/ethernet/stmicro/stmmac/enh_desc.c     | 226 +++++-----
>   drivers/net/ethernet/stmicro/stmmac/norm_desc.c    | 150 ++++---
>   drivers/net/ethernet/stmicro/stmmac/ring_mode.c    |  32 +-
>   drivers/net/ethernet/stmicro/stmmac/stmmac.h       |   9 +-
>   .../net/ethernet/stmicro/stmmac/stmmac_ethtool.c   |  41 +-
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 473 ++++++++++++---------
>   drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c   |   4 +-
>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |  42 +-
>   include/linux/stmmac.h                             |  17 +-
>   20 files changed, 1016 insertions(+), 712 deletions(-)
>