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SubjectRe: [PATCH v11 net-next 00/15] net: mvpp2: Add TX Flow Control support
Hi Stefan,

wt., 9 lut 2021 o 09:43 <stefanc@marvell.com> napisał(a):
>
> From: Stefan Chulski <stefanc@marvell.com>
>
> Armada hardware has a pause generation mechanism in GOP (MAC).
> The GOP generate flow control frames based on an indication programmed in Ports Control 0 Register. There is a bit per port.
> However assertion of the PortX Pause bits in the ports control 0 register only sends a one time pause.
> To complement the function the GOP has a mechanism to periodically send pause control messages based on periodic counters.
> This mechanism ensures that the pause is effective as long as the Appropriate PortX Pause is asserted.
>
> Problem is that Packet Processor that actually can drop packets due to lack of resources not connected to the GOP flow control generation mechanism.
> To solve this issue Armada has firmware running on CM3 CPU dedicated for Flow Control support.
> Firmware monitors Packet Processor resources and asserts XON/XOFF by writing to Ports Control 0 Register.
>
> MSS shared SRAM memory used to communicate between CM3 firmware and PP2 driver.
> During init PP2 driver informs firmware about used BM pools, RXQs, congestion and depletion thresholds.
>
> The pause frames are generated whenever congestion or depletion in resources is detected.
> The back pressure is stopped when the resource reaches a sufficient level.
> So the congestion/depletion and sufficient level implement a hysteresis that reduces the XON/XOFF toggle frequency.
>
> Packet Processor v23 hardware introduces support for RX FIFO fill level monitor.
> Patch "add PPv23 version definition" to differ between v23 and v22 hardware.
> Patch "add TX FC firmware check" verifies that CM3 firmware supports Flow Control monitoring.
>
> v10 --> v11
> - Improve "net: mvpp2: add CM3 SRAM memory map" comment
> - Move condition check to 'net: mvpp2: always compare hw-version vs MVPP21' patch
>
> v9 --> v10
> - Add CM3 SRAM description to PPv2 documentation
>
> v8 --> v9
> - Replace generic pool allocation with devm_ioremap_resource
>
> v7 --> v8
> - Reorder "always compare hw-version vs MVPP21" and "add PPv23 version definition" commits
> - Typo fixes
> - Remove condition fix from "add RXQ flow control configurations"
>
> v6 --> v7
> - Reduce patch set from 18 to 15 patches
> - Documentation change combined into a single patch
> - RXQ and BM size change combined into a single patch
> - Ring size change check moved into "add RXQ flow control configurations" commit
>
> v5 --> v6
> - No change
>
> v4 --> v5
> - Add missed Signed-off
> - Fix warnings in patches 3 and 12
> - Add revision requirement to warning message
> - Move mss_spinlock into RXQ flow control configurations patch
> - Improve FCA RXQ non occupied descriptor threshold commit message
>
> v3 --> v4
> - Remove RFC tag
>
> v2 --> v3
> - Remove inline functions
> - Add PPv2.3 description into marvell-pp2.txt
> - Improve mvpp2_interrupts_mask/unmask procedure
> - Improve FC enable/disable procedure
> - Add priv->sram_pool check
> - Remove gen_pool_destroy call
> - Reduce Flow Control timer to x100 faster
>
> v1 --> v2
> - Add memory requirements information
> - Add EPROBE_DEFER if of_gen_pool_get return NULL
> - Move Flow control configuration to mvpp2_mac_link_up callback
> - Add firmware version info with Flow control support
>
> Konstantin Porotchkin (1):
> dts: marvell: add CM3 SRAM memory to cp11x ethernet device tree
>
> Stefan Chulski (14):
> doc: marvell: add CM3 address space and PPv2.3 description
> net: mvpp2: add CM3 SRAM memory map
> net: mvpp2: always compare hw-version vs MVPP21
> net: mvpp2: add PPv23 version definition
> net: mvpp2: increase BM pool and RXQ size
> net: mvpp2: add FCA periodic timer configurations
> net: mvpp2: add FCA RXQ non occupied descriptor threshold
> net: mvpp2: enable global flow control
> net: mvpp2: add RXQ flow control configurations
> net: mvpp2: add ethtool flow control configuration support
> net: mvpp2: add BM protection underrun feature support
> net: mvpp2: add PPv23 RX FIFO flow control
> net: mvpp2: set 802.3x GoP Flow Control mode
> net: mvpp2: add TX FC firmware check
>
> Documentation/devicetree/bindings/net/marvell-pp2.txt | 6 +-
> arch/arm64/boot/dts/marvell/armada-cp11x.dtsi | 2 +-
> drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 124 ++++-
> drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 526 ++++++++++++++++++--
> 4 files changed, 609 insertions(+), 49 deletions(-)
>

For the series:
Acked-by: Marcin Wojtas <mw@semihalf.com>

Thanks,
Marcin

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