+Cc people involved in previous versions
24/05/2022 17:20, Spike Du:
> LWM(limit watermark) is per RX queue attribute, when RX queue fullness reach
> the LWM limit, HW sends an event to dpdk application.
> Host shaper can configure shaper rate and lwm-triggered for a host port.
> The shaper limits the rate of traffic from host port to wire port.
> If lwm-triggered is enabled, a 100Mbps shaper is enabled automatically when
> one of the host port's Rx queues receives LWM event.
>
> These two features can combine to control traffic from host port to wire port.
> The work flow is configure LWM to RX queue and enable lwm-triggered flag in
> host shaper, after receiving LWM event, delay a while until RX queue is empty
> , then disable the shaper. We recycle this work flow to reduce RX queue drops.
>
> Add new libethdev API to set LWM, add rte event
> RTE_ETH_EVENT_RXQ_LIMIT_REACHED to handle LWM event. For host shaper, because
> it doesn't align to existing DPDK framework and is specific to Nvidia NIC,
> use PMD private API.
>
> For integration with testpmd, put the private cmdline function and LWM event
> handler in mlx5 PMD directory by adding a new file mlx5_test.c. Only add
> minimal code in testpmd to invoke interfaces from mlx5_test.c.
>
> Spike Du (7):
> net/mlx5: add LWM support for Rxq
> common/mlx5: share interrupt management
> ethdev: introduce Rx queue based limit watermark
> net/mlx5: add LWM event handling support
> net/mlx5: support Rx queue based limit watermark
> net/mlx5: add private API to config host port shaper
> app/testpmd: add LWM and Host Shaper command
>
> app/test-pmd/cmdline.c | 74 +++++
> app/test-pmd/config.c | 21 ++
> app/test-pmd/meson.build | 4 +
> app/test-pmd/testpmd.c | 24 ++
> app/test-pmd/testpmd.h | 1 +
> doc/guides/nics/mlx5.rst | 84 ++++++
> doc/guides/rel_notes/release_22_07.rst | 2 +
> drivers/common/mlx5/linux/meson.build | 13 +
> drivers/common/mlx5/linux/mlx5_common_os.c | 131 +++++++++
> drivers/common/mlx5/linux/mlx5_common_os.h | 11 +
> drivers/common/mlx5/mlx5_prm.h | 26 ++
> drivers/common/mlx5/version.map | 2 +
> drivers/common/mlx5/windows/mlx5_common_os.h | 24 ++
> drivers/net/mlx5/linux/mlx5_ethdev_os.c | 71 -----
> drivers/net/mlx5/linux/mlx5_os.c | 132 ++-------
> drivers/net/mlx5/linux/mlx5_socket.c | 53 +---
> drivers/net/mlx5/mlx5.c | 68 +++++
> drivers/net/mlx5/mlx5.h | 12 +-
> drivers/net/mlx5/mlx5_devx.c | 60 +++-
> drivers/net/mlx5/mlx5_devx.h | 1 +
> drivers/net/mlx5/mlx5_rx.c | 292 +++++++++++++++++++
> drivers/net/mlx5/mlx5_rx.h | 13 +
> drivers/net/mlx5/mlx5_testpmd.c | 184 ++++++++++++
> drivers/net/mlx5/mlx5_testpmd.h | 27 ++
> drivers/net/mlx5/mlx5_txpp.c | 28 +-
> drivers/net/mlx5/rte_pmd_mlx5.h | 30 ++
> drivers/net/mlx5/version.map | 2 +
> drivers/net/mlx5/windows/mlx5_ethdev_os.c | 22 --
> drivers/vdpa/mlx5/mlx5_vdpa_virtq.c | 48 +--
> lib/ethdev/ethdev_driver.h | 22 ++
> lib/ethdev/rte_ethdev.c | 52 ++++
> lib/ethdev/rte_ethdev.h | 71 +++++
> lib/ethdev/version.map | 2 +
> 33 files changed, 1299 insertions(+), 308 deletions(-)
> create mode 100644 drivers/net/mlx5/mlx5_testpmd.c
> create mode 100644 drivers/net/mlx5/mlx5_testpmd.h
