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![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>
173 lines
4.6 KiB
C
173 lines
4.6 KiB
C
/*
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* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
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* Copyright (c) 2015 System Fabric Works, Inc. 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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#include <linux/module.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <asm/pgtable.h>
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#include "rxe.h"
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#include "rxe_loc.h"
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#include "rxe_queue.h"
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void rxe_mmap_release(struct kref *ref)
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{
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struct rxe_mmap_info *ip = container_of(ref,
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struct rxe_mmap_info, ref);
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struct rxe_dev *rxe = to_rdev(ip->context->device);
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spin_lock_bh(&rxe->pending_lock);
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if (!list_empty(&ip->pending_mmaps))
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list_del(&ip->pending_mmaps);
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spin_unlock_bh(&rxe->pending_lock);
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vfree(ip->obj); /* buf */
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kfree(ip);
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}
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/*
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* open and close keep track of how many times the memory region is mapped,
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* to avoid releasing it.
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*/
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static void rxe_vma_open(struct vm_area_struct *vma)
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{
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struct rxe_mmap_info *ip = vma->vm_private_data;
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kref_get(&ip->ref);
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}
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static void rxe_vma_close(struct vm_area_struct *vma)
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{
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struct rxe_mmap_info *ip = vma->vm_private_data;
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kref_put(&ip->ref, rxe_mmap_release);
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}
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static struct vm_operations_struct rxe_vm_ops = {
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.open = rxe_vma_open,
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.close = rxe_vma_close,
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};
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/**
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* rxe_mmap - create a new mmap region
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* @context: the IB user context of the process making the mmap() call
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* @vma: the VMA to be initialized
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* Return zero if the mmap is OK. Otherwise, return an errno.
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*/
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int rxe_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
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{
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struct rxe_dev *rxe = to_rdev(context->device);
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unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
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unsigned long size = vma->vm_end - vma->vm_start;
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struct rxe_mmap_info *ip, *pp;
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int ret;
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/*
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* Search the device's list of objects waiting for a mmap call.
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* Normally, this list is very short since a call to create a
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* CQ, QP, or SRQ is soon followed by a call to mmap().
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*/
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spin_lock_bh(&rxe->pending_lock);
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list_for_each_entry_safe(ip, pp, &rxe->pending_mmaps, pending_mmaps) {
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if (context != ip->context || (__u64)offset != ip->info.offset)
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continue;
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/* Don't allow a mmap larger than the object. */
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if (size > ip->info.size) {
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pr_err("mmap region is larger than the object!\n");
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spin_unlock_bh(&rxe->pending_lock);
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ret = -EINVAL;
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goto done;
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}
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goto found_it;
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}
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pr_warn("unable to find pending mmap info\n");
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spin_unlock_bh(&rxe->pending_lock);
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ret = -EINVAL;
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goto done;
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found_it:
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list_del_init(&ip->pending_mmaps);
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spin_unlock_bh(&rxe->pending_lock);
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ret = remap_vmalloc_range(vma, ip->obj, 0);
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if (ret) {
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pr_err("rxe: err %d from remap_vmalloc_range\n", ret);
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goto done;
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}
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vma->vm_ops = &rxe_vm_ops;
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vma->vm_private_data = ip;
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rxe_vma_open(vma);
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done:
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return ret;
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}
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/*
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* Allocate information for rxe_mmap
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*/
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struct rxe_mmap_info *rxe_create_mmap_info(struct rxe_dev *rxe,
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u32 size,
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struct ib_ucontext *context,
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void *obj)
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{
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struct rxe_mmap_info *ip;
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ip = kmalloc(sizeof(*ip), GFP_KERNEL);
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if (!ip)
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return NULL;
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size = PAGE_ALIGN(size);
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spin_lock_bh(&rxe->mmap_offset_lock);
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if (rxe->mmap_offset == 0)
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rxe->mmap_offset = PAGE_SIZE;
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ip->info.offset = rxe->mmap_offset;
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rxe->mmap_offset += size;
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spin_unlock_bh(&rxe->mmap_offset_lock);
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INIT_LIST_HEAD(&ip->pending_mmaps);
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ip->info.size = size;
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ip->context = context;
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ip->obj = obj;
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kref_init(&ip->ref);
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return ip;
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}
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