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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>
193 lines
5.1 KiB
C
193 lines
5.1 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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#include "rxe_queue.h"
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int rxe_srq_chk_attr(struct rxe_dev *rxe, struct rxe_srq *srq,
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struct ib_srq_attr *attr, enum ib_srq_attr_mask mask)
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{
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if (srq && srq->error) {
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pr_warn("srq in error state\n");
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goto err1;
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}
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if (mask & IB_SRQ_MAX_WR) {
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if (attr->max_wr > rxe->attr.max_srq_wr) {
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pr_warn("max_wr(%d) > max_srq_wr(%d)\n",
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attr->max_wr, rxe->attr.max_srq_wr);
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goto err1;
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}
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if (attr->max_wr <= 0) {
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pr_warn("max_wr(%d) <= 0\n", attr->max_wr);
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goto err1;
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}
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if (srq && srq->limit && (attr->max_wr < srq->limit)) {
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pr_warn("max_wr (%d) < srq->limit (%d)\n",
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attr->max_wr, srq->limit);
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goto err1;
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}
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if (attr->max_wr < RXE_MIN_SRQ_WR)
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attr->max_wr = RXE_MIN_SRQ_WR;
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}
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if (mask & IB_SRQ_LIMIT) {
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if (attr->srq_limit > rxe->attr.max_srq_wr) {
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pr_warn("srq_limit(%d) > max_srq_wr(%d)\n",
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attr->srq_limit, rxe->attr.max_srq_wr);
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goto err1;
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}
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if (srq && (attr->srq_limit > srq->rq.queue->buf->index_mask)) {
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pr_warn("srq_limit (%d) > cur limit(%d)\n",
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attr->srq_limit,
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srq->rq.queue->buf->index_mask);
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goto err1;
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}
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}
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if (mask == IB_SRQ_INIT_MASK) {
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if (attr->max_sge > rxe->attr.max_srq_sge) {
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pr_warn("max_sge(%d) > max_srq_sge(%d)\n",
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attr->max_sge, rxe->attr.max_srq_sge);
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goto err1;
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}
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if (attr->max_sge < RXE_MIN_SRQ_SGE)
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attr->max_sge = RXE_MIN_SRQ_SGE;
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}
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return 0;
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err1:
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return -EINVAL;
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}
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int rxe_srq_from_init(struct rxe_dev *rxe, struct rxe_srq *srq,
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struct ib_srq_init_attr *init,
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struct ib_ucontext *context, struct ib_udata *udata)
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{
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int err;
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int srq_wqe_size;
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struct rxe_queue *q;
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srq->ibsrq.event_handler = init->event_handler;
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srq->ibsrq.srq_context = init->srq_context;
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srq->limit = init->attr.srq_limit;
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srq->srq_num = srq->pelem.index;
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srq->rq.max_wr = init->attr.max_wr;
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srq->rq.max_sge = init->attr.max_sge;
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srq_wqe_size = rcv_wqe_size(srq->rq.max_sge);
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spin_lock_init(&srq->rq.producer_lock);
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spin_lock_init(&srq->rq.consumer_lock);
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q = rxe_queue_init(rxe, &srq->rq.max_wr,
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srq_wqe_size);
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if (!q) {
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pr_warn("unable to allocate queue for srq\n");
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return -ENOMEM;
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}
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srq->rq.queue = q;
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err = do_mmap_info(rxe, udata, false, context, q->buf,
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q->buf_size, &q->ip);
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if (err)
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return err;
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if (udata && udata->outlen >= sizeof(struct mminfo) + sizeof(u32)) {
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if (copy_to_user(udata->outbuf + sizeof(struct mminfo),
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&srq->srq_num, sizeof(u32)))
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return -EFAULT;
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}
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return 0;
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}
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int rxe_srq_from_attr(struct rxe_dev *rxe, struct rxe_srq *srq,
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struct ib_srq_attr *attr, enum ib_srq_attr_mask mask,
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struct ib_udata *udata)
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{
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int err;
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struct rxe_queue *q = srq->rq.queue;
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struct mminfo mi = { .offset = 1, .size = 0};
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if (mask & IB_SRQ_MAX_WR) {
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/* Check that we can write the mminfo struct to user space */
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if (udata && udata->inlen >= sizeof(__u64)) {
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__u64 mi_addr;
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/* Get address of user space mminfo struct */
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err = ib_copy_from_udata(&mi_addr, udata,
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sizeof(mi_addr));
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if (err)
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goto err1;
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udata->outbuf = (void __user *)(unsigned long)mi_addr;
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udata->outlen = sizeof(mi);
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if (!access_ok(VERIFY_WRITE,
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(void __user *)udata->outbuf,
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udata->outlen)) {
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err = -EFAULT;
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goto err1;
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}
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}
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err = rxe_queue_resize(q, (unsigned int *)&attr->max_wr,
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rcv_wqe_size(srq->rq.max_sge),
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srq->rq.queue->ip ?
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srq->rq.queue->ip->context :
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NULL,
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udata, &srq->rq.producer_lock,
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&srq->rq.consumer_lock);
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if (err)
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goto err2;
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}
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if (mask & IB_SRQ_LIMIT)
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srq->limit = attr->srq_limit;
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return 0;
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err2:
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rxe_queue_cleanup(q);
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srq->rq.queue = NULL;
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err1:
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return err;
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}
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