mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 09:35:11 +07:00
8700e3e7c4
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>
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
|
|
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include "rxe.h"
|
|
#include "rxe_loc.h"
|
|
|
|
/* Compute a partial ICRC for all the IB transport headers. */
|
|
u32 rxe_icrc_hdr(struct rxe_pkt_info *pkt, struct sk_buff *skb)
|
|
{
|
|
unsigned int bth_offset = 0;
|
|
struct iphdr *ip4h = NULL;
|
|
struct ipv6hdr *ip6h = NULL;
|
|
struct udphdr *udph;
|
|
struct rxe_bth *bth;
|
|
int crc;
|
|
int length;
|
|
int hdr_size = sizeof(struct udphdr) +
|
|
(skb->protocol == htons(ETH_P_IP) ?
|
|
sizeof(struct iphdr) : sizeof(struct ipv6hdr));
|
|
/* pseudo header buffer size is calculate using ipv6 header size since
|
|
* it is bigger than ipv4
|
|
*/
|
|
u8 pshdr[sizeof(struct udphdr) +
|
|
sizeof(struct ipv6hdr) +
|
|
RXE_BTH_BYTES];
|
|
|
|
/* This seed is the result of computing a CRC with a seed of
|
|
* 0xfffffff and 8 bytes of 0xff representing a masked LRH.
|
|
*/
|
|
crc = 0xdebb20e3;
|
|
|
|
if (skb->protocol == htons(ETH_P_IP)) { /* IPv4 */
|
|
memcpy(pshdr, ip_hdr(skb), hdr_size);
|
|
ip4h = (struct iphdr *)pshdr;
|
|
udph = (struct udphdr *)(ip4h + 1);
|
|
|
|
ip4h->ttl = 0xff;
|
|
ip4h->check = CSUM_MANGLED_0;
|
|
ip4h->tos = 0xff;
|
|
} else { /* IPv6 */
|
|
memcpy(pshdr, ipv6_hdr(skb), hdr_size);
|
|
ip6h = (struct ipv6hdr *)pshdr;
|
|
udph = (struct udphdr *)(ip6h + 1);
|
|
|
|
memset(ip6h->flow_lbl, 0xff, sizeof(ip6h->flow_lbl));
|
|
ip6h->priority = 0xf;
|
|
ip6h->hop_limit = 0xff;
|
|
}
|
|
udph->check = CSUM_MANGLED_0;
|
|
|
|
bth_offset += hdr_size;
|
|
|
|
memcpy(&pshdr[bth_offset], pkt->hdr, RXE_BTH_BYTES);
|
|
bth = (struct rxe_bth *)&pshdr[bth_offset];
|
|
|
|
/* exclude bth.resv8a */
|
|
bth->qpn |= cpu_to_be32(~BTH_QPN_MASK);
|
|
|
|
length = hdr_size + RXE_BTH_BYTES;
|
|
crc = crc32_le(crc, pshdr, length);
|
|
|
|
/* And finish to compute the CRC on the remainder of the headers. */
|
|
crc = crc32_le(crc, pkt->hdr + RXE_BTH_BYTES,
|
|
rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES);
|
|
return crc;
|
|
}
|