linux_dsm_epyc7002/drivers/infiniband/sw/rxe/Kconfig
yonatanc cee2688e3c IB/rxe: Offload CRC calculation when possible
Use CPU ability to perform CRC calculations, by
replacing direct calls to crc32_le() with crypto_shash_updata().

The overall performance gain measured with ib_send_bw tool is 10% and it
was tested on "Intel CPU ES-2660 v2 @ 2.20Ghz" CPU.

ib_send_bw -d rxe0  -x 1 -n 9000 -e  -s $((1024 * 1024 )) -l 100

---------------------------------------------------------------------------------------------
|             | bytes   | iterations | BW peak[MB/sec] | BW average[MB/sec] | MsgRate[Mpps] |
---------------------------------------------------------------------------------------------
| crc32_le    | 1048576 | 9000       | inf             | 497.60             | 0.000498      |
| CRC offload | 1048576 | 9000       | inf             | 546.70             | 0.000547      |
---------------------------------------------------------------------------------------------

Fixes: 8700e3e7c4 ("Soft RoCE driver")
Signed-off-by: Yonatan Cohen <yonatanc@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2017-04-21 10:45:02 -04:00

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config RDMA_RXE
tristate "Software RDMA over Ethernet (RoCE) driver"
depends on INET && PCI && INFINIBAND
depends on NET_UDP_TUNNEL
depends on CRYPTO_CRC32
select DMA_VIRT_OPS
---help---
This driver implements the InfiniBand RDMA transport over
the Linux network stack. It enables a system with a
standard Ethernet adapter to interoperate with a RoCE
adapter or with another system running the RXE driver.
Documentation on InfiniBand and RoCE can be downloaded at
www.infinibandta.org and www.openfabrics.org. (See also
siw which is a similar software driver for iWARP.)
The driver is split into two layers, one interfaces with the
Linux RDMA stack and implements a kernel or user space
verbs API. The user space verbs API requires a support
library named librxe which is loaded by the generic user
space verbs API, libibverbs. The other layer interfaces
with the Linux network stack at layer 3.
To configure and work with soft-RoCE driver please use the
following wiki page under "configure Soft-RoCE (RXE)" section:
https://github.com/linux-rdma/rdma-core/blob/master/Documentation/rxe.md