Introduction: LRO (Large Receive Offload) is intended to reduce host CPU overhead when processing Rx TCP packets. LRO works by aggregating multiple incoming packets from a single stream into a larger buffer, before they are passed higher up the networking stack. Thus reducing the number of packets that have to be processed.
Use: MLX5 PMD will query the HCA capabilities on initialization to check if LRO is supported and can be used. LRO in MLX5 PMD is intended for use by applications using a relatively small number of flows. LRO support can be enabled only per port. In each LRO session, packets of the same flow will be coalesced until one of the following occur: * Buffer size limit is exceeded. * Session timeout is exceeded. * Packet from a different flow is received on the same queue. When LRO session ends the coalesced packet is passed to the PMD, which will update the header fields before passing the packet to the application. For efficient memory utilization, the MPRQ mechanism is used. Support of Non-LRO flows will not be impacted. Existing API: Offload capability DEV_RX_OFFLOAD_TCP_LRO will be used to indicate device supports LRO. testpmd command-line option "-enable-lro" will be used to request LRO feature enable on application start. testpmd rx_offload "tcp_lro" on or off will be used to request LRO feature enable or disable during application runtime. Offload flag PKT_RX_LRO will be used. This flag can be set in Rx mbuf to indicate this is a LRO coalesced packet. New API: PMD configuration parameter lro_timeout_usec will be added. This parameter can be used by application to select LRO session timeout (in microseconds). If this value is not specified, the minimal value supported by device will be used. Known limitations: mbuf head-room is zero for any packet if LRO is configured in the port. Keep CRC offload cannot be supported with LRO. CQE compression is not supported with LRO. v2: Fix small compilation issue detected per commit (Found By Ferruh). Dekel Peled (23): net/mlx5: remove redundant item from union net/mlx5: add LRO APIs and initial settings net/mlx5: support LRO caps query using devx API net/mlx5: glue func for queue query using new API net/mlx5: glue function for action using new API net/mlx5: check conditions to enable LRO net/mlx5: support Tx interface query using new API net/mlx5: update Tx queue create for LRO net/mlx5: create advanced RxQ object using new API net/mlx5: modify advanced RxQ object using new API net/mlx5: create advanced Rx object using new API net/mlx5: create advanced RxQ table using new API net/mlx5: allocate door-bells using new API net/mlx5: rename RxQ verbs to general RxQ object net/mlx5: rename verbs indirection table to obj net/mlx5: rename hash RxQ verbs to general net/mlx5: update queue state modify function net/mlx5: store protection domain number on create net/mlx5: func to create Rx verbs completion queue net/mlx5: function to create Rx verbs work queue net/mlx5: create advanced RxQ using new API net/mlx5: support LRO with single RxQ object doc: update MLX5 doc and release notes with LRO Matan Azrad (5): net/mlx5: replace the external mbuf shared memory net/mlx5: update LRO fields in completion entry net/mlx5: handle LRO packets in Rx queue net/mlx5: zero the LRO mbuf headroom net/mlx5: adjust the maximum LRO message size doc/guides/nics/features/mlx5.ini | 1 + doc/guides/nics/mlx5.rst | 14 + doc/guides/rel_notes/release_19_08.rst | 2 +- drivers/net/mlx5/Makefile | 5 + drivers/net/mlx5/meson.build | 2 + drivers/net/mlx5/mlx5.c | 223 ++++++- drivers/net/mlx5/mlx5.h | 160 ++++- drivers/net/mlx5/mlx5_devx_cmds.c | 326 +++++++++ drivers/net/mlx5/mlx5_ethdev.c | 14 +- drivers/net/mlx5/mlx5_flow.h | 6 + drivers/net/mlx5/mlx5_flow_dv.c | 28 +- drivers/net/mlx5/mlx5_flow_verbs.c | 3 +- drivers/net/mlx5/mlx5_glue.c | 33 + drivers/net/mlx5/mlx5_glue.h | 6 +- drivers/net/mlx5/mlx5_prm.h | 379 ++++++++++- drivers/net/mlx5/mlx5_rxq.c | 1132 ++++++++++++++++++++++---------- drivers/net/mlx5/mlx5_rxtx.c | 167 ++++- drivers/net/mlx5/mlx5_rxtx.h | 80 ++- drivers/net/mlx5/mlx5_rxtx_vec.h | 6 +- drivers/net/mlx5/mlx5_rxtx_vec_sse.h | 16 +- drivers/net/mlx5/mlx5_trigger.c | 12 +- drivers/net/mlx5/mlx5_txq.c | 27 +- drivers/net/mlx5/mlx5_vlan.c | 32 +- 23 files changed, 2194 insertions(+), 480 deletions(-) -- 1.8.3.1
