linux-kernel - Re: [PATCH net-next v3 0/4] net: lan966x: Add support for FDMA

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Date:   Mon, 04 Apr 2022 19:20:56 +0200
From:   Michael Walle <michael@...le.cc>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com
Subject: Re: [PATCH net-next v3 0/4] net: lan966x: Add support for FDMA

Am 2022-04-04 15:06, schrieb Horatiu Vultur:
> Currently when injecting or extracting a frame from CPU, the frame
> is given to the HW each word at a time. There is another way to
> inject/extract frames from CPU using FDMA(Frame Direct Memory Access).
> In this way the entire frame is given to the HW. This improves both
> RX and TX bitrate.
> 
> v2->v3:
> - move skb_tx_timestamp before the IFH is inserted, because in case of 
> PHY
>   timestamping, the PHY should not see the IFH.
> - use lower/upper_32_bits()
> - reimplement the RX path in case of memory pressure.
> - use devm_request_irq instead of devm_request_threaded_irq
> - add various checks for return values.
> 
> v1->v2:
> - fix typo in commit message in last patch
> - remove first patch as the changes are already there
> - make sure that there is space in skb to put the FCS
> - move skb_tx_timestamp closer to the handover of the frame to the HW
> 
> Horatiu Vultur (4):
>   net: lan966x: Add registers that are used for FDMA.
>   net: lan966x: Expose functions that are needed by FDMA
>   net: lan966x: Add FDMA functionality
>   net: lan966x: Update FDMA to change MTU.
> 
>  .../net/ethernet/microchip/lan966x/Makefile   |   2 +-
>  .../ethernet/microchip/lan966x/lan966x_fdma.c | 783 ++++++++++++++++++
>  .../ethernet/microchip/lan966x/lan966x_main.c |  49 +-
>  .../ethernet/microchip/lan966x/lan966x_main.h | 121 +++
>  .../ethernet/microchip/lan966x/lan966x_port.c |   3 +
>  .../ethernet/microchip/lan966x/lan966x_regs.h | 106 +++
>  6 files changed, 1052 insertions(+), 12 deletions(-)
>  create mode 100644 
> drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c

For this series:
Tested-by: Michael Walle <michael@...le.cc> # on kontron-kswitch-d10

-michael