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Soft RoCE (RXE) - The software RoCE driver
ib_rxe implements the RDMA transport and registers to the RDMA core
device as a kernel verbs provider. It also implements the packet IO
layer. On the other hand ib_rxe registers to the Linux netdev stack
as a udp encapsulating protocol, in that case RDMA, for sending and
receiving packets over any Ethernet device. This yields a RDMA
transport over the UDP/Ethernet network layer forming a RoCEv2
compatible device.
The configuration procedure of the Soft RoCE drivers requires
binding to any existing Ethernet network device. This is done with
/sys interface.
A userspace Soft RoCE library (librxe) provides user applications
the ability to run with Soft RoCE devices. The use of rxe verbs ins
user space requires the inclusion of librxe as a device specifics
plug-in to libibverbs. librxe is packaged separately.
Architecture:
+-----------------------------------------------------------+
| Application |
+-----------------------------------------------------------+
+-----------------------------------+
| libibverbs |
User +-----------------------------------+
+----------------+ +----------------+
| librxe | | HW RoCE lib |
+----------------+ +----------------+
+---------------------------------------------------------------+
+--------------+ +------------+
| Sockets | | RDMA ULP |
+--------------+ +------------+
+--------------+ +---------------------+
| TCP/IP | | ib_core |
+--------------+ +---------------------+
+------------+ +----------------+
Kernel | ib_rxe | | HW RoCE driver |
+------------+ +----------------+
+------------------------------------+
| NIC driver |
+------------------------------------+
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+-----------------------------------------------------------+
| Application |
+-----------------------------------------------------------+
+-----------------------------------+
| libibverbs |
User +-----------------------------------+
+----------------+ +----------------+
| librxe | | HW RoCE lib |
+----------------+ +----------------+
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+--------------+ +------------+
| Sockets | | RDMA ULP |
+--------------+ +------------+
+--------------+ +---------------------+
| TCP/IP | | ib_core |
+--------------+ +---------------------+
+------------+ +----------------+
Kernel | ib_rxe | | HW RoCE driver |
+------------+ +----------------+
+------------------------------------+
| NIC driver |
+------------------------------------+
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Soft RoCE resources:
[1[ https://github.com/SoftRoCE/librxe-dev librxe - source code in
Github
[2] https://github.com/SoftRoCE/rxe-dev/wiki/rxe-dev:-Home - Soft RoCE
Wiki page
[3] https://github.com/SoftRoCE/librxe-dev - Soft RoCE userspace library
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
145 lines
3.1 KiB
C
145 lines
3.1 KiB
C
/*
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* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef RDMA_USER_RXE_H
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#define RDMA_USER_RXE_H
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#include <linux/types.h>
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union rxe_gid {
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__u8 raw[16];
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struct {
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__be64 subnet_prefix;
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__be64 interface_id;
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} global;
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};
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struct rxe_global_route {
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union rxe_gid dgid;
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__u32 flow_label;
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__u8 sgid_index;
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__u8 hop_limit;
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__u8 traffic_class;
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};
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struct rxe_av {
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__u8 port_num;
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__u8 network_type;
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struct rxe_global_route grh;
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union {
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struct sockaddr _sockaddr;
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struct sockaddr_in _sockaddr_in;
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struct sockaddr_in6 _sockaddr_in6;
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} sgid_addr, dgid_addr;
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};
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struct rxe_send_wr {
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__u64 wr_id;
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__u32 num_sge;
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__u32 opcode;
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__u32 send_flags;
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union {
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__be32 imm_data;
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__u32 invalidate_rkey;
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} ex;
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union {
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struct {
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__u64 remote_addr;
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__u32 rkey;
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} rdma;
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struct {
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__u64 remote_addr;
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__u64 compare_add;
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__u64 swap;
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__u32 rkey;
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} atomic;
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struct {
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__u32 remote_qpn;
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__u32 remote_qkey;
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__u16 pkey_index;
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} ud;
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struct {
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struct ib_mr *mr;
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__u32 key;
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int access;
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} reg;
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} wr;
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};
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struct rxe_sge {
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__u64 addr;
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__u32 length;
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__u32 lkey;
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};
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struct mminfo {
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__u64 offset;
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__u32 size;
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__u32 pad;
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};
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struct rxe_dma_info {
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__u32 length;
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__u32 resid;
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__u32 cur_sge;
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__u32 num_sge;
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__u32 sge_offset;
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union {
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__u8 inline_data[0];
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struct rxe_sge sge[0];
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};
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};
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struct rxe_send_wqe {
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struct rxe_send_wr wr;
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struct rxe_av av;
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__u32 status;
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__u32 state;
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__u64 iova;
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__u32 mask;
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__u32 first_psn;
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__u32 last_psn;
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__u32 ack_length;
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__u32 ssn;
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__u32 has_rd_atomic;
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struct rxe_dma_info dma;
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};
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struct rxe_recv_wqe {
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__u64 wr_id;
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__u32 num_sge;
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__u32 padding;
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struct rxe_dma_info dma;
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};
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#endif /* RDMA_USER_RXE_H */
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