mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Moni Shoua](/assets/img/avatar_default.png)
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>
154 lines
3.8 KiB
C
154 lines
3.8 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 <linux/kernel.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/hardirq.h>
|
|
|
|
#include "rxe_task.h"
|
|
|
|
int __rxe_do_task(struct rxe_task *task)
|
|
|
|
{
|
|
int ret;
|
|
|
|
while ((ret = task->func(task->arg)) == 0)
|
|
;
|
|
|
|
task->ret = ret;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* this locking is due to a potential race where
|
|
* a second caller finds the task already running
|
|
* but looks just after the last call to func
|
|
*/
|
|
void rxe_do_task(unsigned long data)
|
|
{
|
|
int cont;
|
|
int ret;
|
|
unsigned long flags;
|
|
struct rxe_task *task = (struct rxe_task *)data;
|
|
|
|
spin_lock_irqsave(&task->state_lock, flags);
|
|
switch (task->state) {
|
|
case TASK_STATE_START:
|
|
task->state = TASK_STATE_BUSY;
|
|
spin_unlock_irqrestore(&task->state_lock, flags);
|
|
break;
|
|
|
|
case TASK_STATE_BUSY:
|
|
task->state = TASK_STATE_ARMED;
|
|
/* fall through to */
|
|
case TASK_STATE_ARMED:
|
|
spin_unlock_irqrestore(&task->state_lock, flags);
|
|
return;
|
|
|
|
default:
|
|
spin_unlock_irqrestore(&task->state_lock, flags);
|
|
pr_warn("bad state = %d in rxe_do_task\n", task->state);
|
|
return;
|
|
}
|
|
|
|
do {
|
|
cont = 0;
|
|
ret = task->func(task->arg);
|
|
|
|
spin_lock_irqsave(&task->state_lock, flags);
|
|
switch (task->state) {
|
|
case TASK_STATE_BUSY:
|
|
if (ret)
|
|
task->state = TASK_STATE_START;
|
|
else
|
|
cont = 1;
|
|
break;
|
|
|
|
/* soneone tried to run the task since the last time we called
|
|
* func, so we will call one more time regardless of the
|
|
* return value
|
|
*/
|
|
case TASK_STATE_ARMED:
|
|
task->state = TASK_STATE_BUSY;
|
|
cont = 1;
|
|
break;
|
|
|
|
default:
|
|
pr_warn("bad state = %d in rxe_do_task\n",
|
|
task->state);
|
|
}
|
|
spin_unlock_irqrestore(&task->state_lock, flags);
|
|
} while (cont);
|
|
|
|
task->ret = ret;
|
|
}
|
|
|
|
int rxe_init_task(void *obj, struct rxe_task *task,
|
|
void *arg, int (*func)(void *), char *name)
|
|
{
|
|
task->obj = obj;
|
|
task->arg = arg;
|
|
task->func = func;
|
|
snprintf(task->name, sizeof(task->name), "%s", name);
|
|
|
|
tasklet_init(&task->tasklet, rxe_do_task, (unsigned long)task);
|
|
|
|
task->state = TASK_STATE_START;
|
|
spin_lock_init(&task->state_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rxe_cleanup_task(struct rxe_task *task)
|
|
{
|
|
tasklet_kill(&task->tasklet);
|
|
}
|
|
|
|
void rxe_run_task(struct rxe_task *task, int sched)
|
|
{
|
|
if (sched)
|
|
tasklet_schedule(&task->tasklet);
|
|
else
|
|
rxe_do_task((unsigned long)task);
|
|
}
|
|
|
|
void rxe_disable_task(struct rxe_task *task)
|
|
{
|
|
tasklet_disable(&task->tasklet);
|
|
}
|
|
|
|
void rxe_enable_task(struct rxe_task *task)
|
|
{
|
|
tasklet_enable(&task->tasklet);
|
|
}
|