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NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | AUTHORS | COLOPHON |
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RXE(7) Miscellaneous Information Manual RXE(7)
rxe - Software RDMA over Ethernet
modprobe rdma_rxe
This is usually performed by a configuration utility (see rdma
link(8).)
The rdma_rxe kernel module provides a software implementation of
the RoCEv2 protocol. The RoCEv2 protocol is an RDMA transport
protocol that exists on top of UDP/IPv4 or UDP/IPv6. The
InfiniBand (IB) Base Transport Header (BTH) is encapsulated in the
UDP packet.
Once a RXE instance has been created, communicating via RXE is the
same as communicating via any OFED compatible Infiniband HCA,
albeit in some cases with addressing implications.
In particular, while the use of a GRH header is optional within IB
subnets, it is mandatory with RoCE. Verbs applications written
over IB verbs should work seamlessly, but they require
provisioning of GRH information when creating address vectors. The
library and driver are modified to provide for mapping from GID to
MAC addresses required by the hardware.
/sys/class/infiniband/rxe[0,1,...]
Directory that holds RDMA device information. The format is
the same as other RDMA devices.
/sys/module/rdma_rxe_net/parameters/mtu
Write only file used to configure RoCE and Ethernet MTU
values.
/sys/module/rdma_rxe/parameters/max_ucontext
Read/Write file that sets a limit on the number of UCs
allowed per RXE device.
/sys/module/rdma_rxe/parameters/max_qp
Read/Write file that sets a limit on the number of QPs
allowed per RXE device.
/sys/module/rdma_rxe/parameters/max_qp_wr
Read/Write file that sets a limit on the number of WRs per
QP allowed per RXE device.
/sys/module/rdma_rxe/parameters/max_mr
Read/Write file that sets a limit on the number of MRs
allowed per RXE device.
/sys/module/rdma_rxe/parameters/max_fmr
Read/Write file that sets a limit on the number of FMRs
allowed per RXE device.
/sys/module/rdma_rxe/parameters/max_cq
Read/Write file that sets a limit on the number of CQs
allowed per RXE device.
/sys/module/rdma_rxe/parameters/max_log_cqe
Read/Write file that sets a limit on the log base 2 of the
number of CQEs per CQ allowed per RXE device.
/sys/module/rdma_rxe/parameters/max_inline_data
Read/Write file that sets a limit on the maximum amount of
inline data per WR allowed per RXE device.
The above configuration parameters only affect a new RXE
instance when it is created not afterwards.
/sys/module/rdma_rxe/parameters/crc_disable
Read/Write file that controls the disabling of ICRC
computation. Set to a nonzero value for TRUE. Zero for
FALSE.
/sys/module/rdma_rxe/parameters/fast_comp|req|resp|arb
Read/Write file that enables calling kernel tasklets as
subroutines to reduce latency.
/sys/module/rdma_rxe/parameters/nsec_per_packet|kbyte
Read/Write file that controls static rate pacing for output
packets. If set to nonzero values the minimum delay to the
next packet is set to nsec_per_kbyte * sizeof(current
packet in KBytes) or nsec_per_packet which ever is less.
/sys/module/rdma_rxe/parameters/max_packet_per_ack
Read/Write file that controls the issuing of acks by the
responder during a long message. If set additional acks
will be generated every max_pkt_per_ack packets.
/sys/module/rdma_rxe/parameters/max_skb_per_qp
Read/Write file that controls the number of skbs (packets)
that a requester can queue for sending internally.
/sys/module/rdma_rxe/parameters/max_req_comp_gap
Read/Write file that controls the maximum gap between the
PSN of request packets send and ack packets received.
/sys/module/rdma_rxe/parameters/default_mtu
Read/Write file that controls the default mtu used for UD
packets.
rdma(8), verbs(7),
Written by John Groves, Frank Zago and Bob Pearson at System
Fabric Works.
This page is part of the rdma-core (RDMA Core Userspace Libraries
and Daemons) project. Information about the project can be found
at ⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug
report for this manual page, send it to
linux-rdma@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
1.0.0 2011-06-29 RXE(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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