The docs on DPDK’s website make it seem like the MLX-5 drivers support DMA with DPDK but over the past week I have failed to get DPDK to recognize any DMA devices.
Also, what parameters should be supplied to EAL to get DPDK DMA working?
I’d rather use DPDK DMA as it has more features than the DOCA DMA library.
If DPDK DMA does not work with the BF3 card then what is the best way to use the DOCA DMA library? The sample code is very simplistic and does not provide any examples of how to signal the DPU that the host has read the buffer (handshaking) nor some form of a ring buffer.
ubuntu@localhost:~$ /opt/mellanox/dpdk/bin/dpdk-devbind.py --status
Network devices using kernel driver
===================================
0000:03:00.0 'MT43244 BlueField-3 integrated ConnectX-7 network controller a2dc' if=en3f0pf0sf0,p0,pf0hpf drv=mlx5_core unused=
0000:03:00.1 'MT43244 BlueField-3 integrated ConnectX-7 network controller a2dc' if=en3f1pf1sf0,pf1hpf,p1 drv=mlx5_core unused=
No 'Baseband' devices detected
==============================
No 'Crypto' devices detected
============================
No 'DMA' devices detected
=========================
No 'Eventdev' devices detected
==============================
No 'Mempool' devices detected
=============================
No 'Compress' devices detected
==============================
No 'Misc (rawdev)' devices detected
===================================
No 'Regex' devices detected
===========================
ubuntu@localhost:~$ cat /proc/modules | grep -i dma
rdma_ucm 36864 0 - Live 0x0000000000000000 (O)
rdma_cm 122880 1 rdma_ucm, Live 0x0000000000000000 (O)
iw_cm 53248 1 rdma_cm, Live 0x0000000000000000 (O)
ib_cm 131072 2 rdma_cm,ib_ipoib, Live 0x0000000000000000 (O)
ib_uverbs 155648 5 rdma_ucm,mlx5_ib, Live 0x0000000000000000 (O)
ib_core 479232 8 rdma_ucm,rdma_cm,iw_cm,ib_ipoib,ib_cm,ib_umad,mlx5_ib,ib_uverbs, Live 0x0000000000000000 (O)
mlx_compat 20480 14 nvme_fabrics,rdma_ucm,rdma_cm,iw_cm,ib_ipoib,ib_cm,ib_umad,mlx5_ib,ib_uverbs,ib_core,mlx5_core,nvme,mlxdevm,nvme_core, Live 0x0000000000000000 (O)