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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>
217 lines
5.1 KiB
C
217 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 retailuce 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/vmalloc.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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int do_mmap_info(struct rxe_dev *rxe,
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struct ib_udata *udata,
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bool is_req,
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struct ib_ucontext *context,
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struct rxe_queue_buf *buf,
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size_t buf_size,
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struct rxe_mmap_info **ip_p)
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{
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int err;
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u32 len, offset;
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struct rxe_mmap_info *ip = NULL;
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if (udata) {
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if (is_req) {
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len = udata->outlen - sizeof(struct mminfo);
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offset = sizeof(struct mminfo);
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} else {
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len = udata->outlen;
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offset = 0;
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}
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if (len < sizeof(ip->info))
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goto err1;
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ip = rxe_create_mmap_info(rxe, buf_size, context, buf);
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if (!ip)
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goto err1;
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err = copy_to_user(udata->outbuf + offset, &ip->info,
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sizeof(ip->info));
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if (err)
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goto err2;
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spin_lock_bh(&rxe->pending_lock);
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list_add(&ip->pending_mmaps, &rxe->pending_mmaps);
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spin_unlock_bh(&rxe->pending_lock);
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}
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*ip_p = ip;
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return 0;
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err2:
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kfree(ip);
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err1:
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return -EINVAL;
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}
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struct rxe_queue *rxe_queue_init(struct rxe_dev *rxe,
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int *num_elem,
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unsigned int elem_size)
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{
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struct rxe_queue *q;
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size_t buf_size;
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unsigned int num_slots;
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/* num_elem == 0 is allowed, but uninteresting */
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if (*num_elem < 0)
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goto err1;
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q = kmalloc(sizeof(*q), GFP_KERNEL);
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if (!q)
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goto err1;
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q->rxe = rxe;
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/* used in resize, only need to copy used part of queue */
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q->elem_size = elem_size;
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/* pad element up to at least a cacheline and always a power of 2 */
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if (elem_size < cache_line_size())
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elem_size = cache_line_size();
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elem_size = roundup_pow_of_two(elem_size);
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q->log2_elem_size = order_base_2(elem_size);
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num_slots = *num_elem + 1;
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num_slots = roundup_pow_of_two(num_slots);
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q->index_mask = num_slots - 1;
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buf_size = sizeof(struct rxe_queue_buf) + num_slots * elem_size;
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q->buf = vmalloc_user(buf_size);
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if (!q->buf)
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goto err2;
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q->buf->log2_elem_size = q->log2_elem_size;
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q->buf->index_mask = q->index_mask;
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q->buf_size = buf_size;
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*num_elem = num_slots - 1;
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return q;
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err2:
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kfree(q);
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err1:
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return NULL;
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}
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/* copies elements from original q to new q and then swaps the contents of the
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* two q headers. This is so that if anyone is holding a pointer to q it will
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* still work
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*/
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static int resize_finish(struct rxe_queue *q, struct rxe_queue *new_q,
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unsigned int num_elem)
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{
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if (!queue_empty(q) && (num_elem < queue_count(q)))
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return -EINVAL;
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while (!queue_empty(q)) {
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memcpy(producer_addr(new_q), consumer_addr(q),
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new_q->elem_size);
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advance_producer(new_q);
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advance_consumer(q);
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}
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swap(*q, *new_q);
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return 0;
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}
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int rxe_queue_resize(struct rxe_queue *q,
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unsigned int *num_elem_p,
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unsigned int elem_size,
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struct ib_ucontext *context,
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struct ib_udata *udata,
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spinlock_t *producer_lock,
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spinlock_t *consumer_lock)
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{
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struct rxe_queue *new_q;
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unsigned int num_elem = *num_elem_p;
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int err;
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unsigned long flags = 0, flags1;
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new_q = rxe_queue_init(q->rxe, &num_elem, elem_size);
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if (!new_q)
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return -ENOMEM;
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err = do_mmap_info(new_q->rxe, udata, false, context, new_q->buf,
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new_q->buf_size, &new_q->ip);
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if (err) {
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vfree(new_q->buf);
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kfree(new_q);
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goto err1;
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}
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spin_lock_irqsave(consumer_lock, flags1);
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if (producer_lock) {
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spin_lock_irqsave(producer_lock, flags);
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err = resize_finish(q, new_q, num_elem);
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spin_unlock_irqrestore(producer_lock, flags);
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} else {
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err = resize_finish(q, new_q, num_elem);
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}
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spin_unlock_irqrestore(consumer_lock, flags1);
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rxe_queue_cleanup(new_q); /* new/old dep on err */
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if (err)
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goto err1;
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*num_elem_p = num_elem;
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return 0;
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err1:
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return err;
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}
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void rxe_queue_cleanup(struct rxe_queue *q)
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{
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if (q->ip)
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kref_put(&q->ip->ref, rxe_mmap_release);
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else
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vfree(q->buf);
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kfree(q);
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}
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