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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>
166 lines
4.4 KiB
C
166 lines
4.4 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 "rxe.h"
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#include "rxe_loc.h"
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#define DMA_BAD_ADDER ((u64)0)
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static int rxe_mapping_error(struct ib_device *dev, u64 dma_addr)
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{
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return dma_addr == DMA_BAD_ADDER;
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}
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static u64 rxe_dma_map_single(struct ib_device *dev,
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void *cpu_addr, size_t size,
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enum dma_data_direction direction)
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{
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WARN_ON(!valid_dma_direction(direction));
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return (uintptr_t)cpu_addr;
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}
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static void rxe_dma_unmap_single(struct ib_device *dev,
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u64 addr, size_t size,
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enum dma_data_direction direction)
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{
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WARN_ON(!valid_dma_direction(direction));
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}
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static u64 rxe_dma_map_page(struct ib_device *dev,
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struct page *page,
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unsigned long offset,
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size_t size, enum dma_data_direction direction)
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{
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u64 addr;
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WARN_ON(!valid_dma_direction(direction));
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if (offset + size > PAGE_SIZE) {
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addr = DMA_BAD_ADDER;
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goto done;
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}
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addr = (uintptr_t)page_address(page);
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if (addr)
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addr += offset;
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done:
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return addr;
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}
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static void rxe_dma_unmap_page(struct ib_device *dev,
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u64 addr, size_t size,
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enum dma_data_direction direction)
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{
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WARN_ON(!valid_dma_direction(direction));
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}
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static int rxe_map_sg(struct ib_device *dev, struct scatterlist *sgl,
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int nents, enum dma_data_direction direction)
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{
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struct scatterlist *sg;
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u64 addr;
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int i;
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int ret = nents;
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WARN_ON(!valid_dma_direction(direction));
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for_each_sg(sgl, sg, nents, i) {
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addr = (uintptr_t)page_address(sg_page(sg));
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if (!addr) {
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ret = 0;
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break;
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}
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sg->dma_address = addr + sg->offset;
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#ifdef CONFIG_NEED_SG_DMA_LENGTH
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sg->dma_length = sg->length;
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#endif
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}
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return ret;
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}
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static void rxe_unmap_sg(struct ib_device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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WARN_ON(!valid_dma_direction(direction));
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}
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static void rxe_sync_single_for_cpu(struct ib_device *dev,
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u64 addr,
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size_t size, enum dma_data_direction dir)
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{
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}
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static void rxe_sync_single_for_device(struct ib_device *dev,
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u64 addr,
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size_t size, enum dma_data_direction dir)
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{
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}
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static void *rxe_dma_alloc_coherent(struct ib_device *dev, size_t size,
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u64 *dma_handle, gfp_t flag)
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{
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struct page *p;
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void *addr = NULL;
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p = alloc_pages(flag, get_order(size));
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if (p)
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addr = page_address(p);
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if (dma_handle)
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*dma_handle = (uintptr_t)addr;
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return addr;
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}
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static void rxe_dma_free_coherent(struct ib_device *dev, size_t size,
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void *cpu_addr, u64 dma_handle)
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{
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free_pages((unsigned long)cpu_addr, get_order(size));
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}
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struct ib_dma_mapping_ops rxe_dma_mapping_ops = {
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.mapping_error = rxe_mapping_error,
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.map_single = rxe_dma_map_single,
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.unmap_single = rxe_dma_unmap_single,
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.map_page = rxe_dma_map_page,
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.unmap_page = rxe_dma_unmap_page,
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.map_sg = rxe_map_sg,
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.unmap_sg = rxe_unmap_sg,
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.sync_single_for_cpu = rxe_sync_single_for_cpu,
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.sync_single_for_device = rxe_sync_single_for_device,
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.alloc_coherent = rxe_dma_alloc_coherent,
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.free_coherent = rxe_dma_free_coherent
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};
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