Multi-Packet Rx Queue (MPRQ a.k.a Striding RQ) can further save PCIe bandwidth by posting a single large buffer for multiple packets. Instead of posting a buffer per a packet, one large buffer is posted in order to receive multiple packets on the buffer. A MPRQ buffer consists of multiple fixed-size strides and each stride receives one packet.
Rx packet is either mem-copied to a user-provided mbuf if length is comparatively small or referenced by mbuf indirection otherwise. In case of indirection, the Mempool for the direct mbufs will be allocated and managed by PMD. In order to make mbuf indirections to each packets in the buffer, buf_off field is added to rte_mbuf structure and rte_pktmbuf_attach_at() is also added. Yongseok Koh (6): mbuf: add buffer offset field for flexible indirection net/mlx5: separate filling Rx flags net/mlx5: add a function to rdma-core glue net/mlx5: add Multi-Packet Rx support net/mlx5: release Tx queue resource earlier than Rx app/testpmd: conserve mbuf indirection flag app/test-pmd/csumonly.c | 2 + app/test-pmd/macfwd.c | 2 + app/test-pmd/macswap.c | 2 + doc/guides/nics/mlx5.rst | 23 +++ drivers/net/mlx5/Makefile | 5 + drivers/net/mlx5/mlx5.c | 79 +++++++- drivers/net/mlx5/mlx5.h | 3 + drivers/net/mlx5/mlx5_defs.h | 20 ++ drivers/net/mlx5/mlx5_ethdev.c | 3 + drivers/net/mlx5/mlx5_glue.c | 9 + drivers/net/mlx5/mlx5_glue.h | 4 + drivers/net/mlx5/mlx5_prm.h | 15 ++ drivers/net/mlx5/mlx5_rxq.c | 389 +++++++++++++++++++++++++++++++++++---- drivers/net/mlx5/mlx5_rxtx.c | 236 ++++++++++++++++++++---- drivers/net/mlx5/mlx5_rxtx.h | 16 +- drivers/net/mlx5/mlx5_rxtx_vec.c | 4 + drivers/net/mlx5/mlx5_rxtx_vec.h | 3 +- lib/librte_mbuf/rte_mbuf.h | 158 +++++++++++++++- 18 files changed, 895 insertions(+), 78 deletions(-) -- 2.11.0
