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>
190 lines
4.4 KiB
C
190 lines
4.4 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 "rxe.h"
|
|
#include "rxe_loc.h"
|
|
|
|
int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid,
|
|
struct rxe_mc_grp **grp_p)
|
|
{
|
|
int err;
|
|
struct rxe_mc_grp *grp;
|
|
|
|
if (rxe->attr.max_mcast_qp_attach == 0) {
|
|
err = -EINVAL;
|
|
goto err1;
|
|
}
|
|
|
|
grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
|
|
if (grp)
|
|
goto done;
|
|
|
|
grp = rxe_alloc(&rxe->mc_grp_pool);
|
|
if (!grp) {
|
|
err = -ENOMEM;
|
|
goto err1;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&grp->qp_list);
|
|
spin_lock_init(&grp->mcg_lock);
|
|
grp->rxe = rxe;
|
|
|
|
rxe_add_key(grp, mgid);
|
|
|
|
err = rxe->ifc_ops->mcast_add(rxe, mgid);
|
|
if (err)
|
|
goto err2;
|
|
|
|
done:
|
|
*grp_p = grp;
|
|
return 0;
|
|
|
|
err2:
|
|
rxe_drop_ref(grp);
|
|
err1:
|
|
return err;
|
|
}
|
|
|
|
int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
|
|
struct rxe_mc_grp *grp)
|
|
{
|
|
int err;
|
|
struct rxe_mc_elem *elem;
|
|
|
|
/* check to see of the qp is already a member of the group */
|
|
spin_lock_bh(&qp->grp_lock);
|
|
spin_lock_bh(&grp->mcg_lock);
|
|
list_for_each_entry(elem, &grp->qp_list, qp_list) {
|
|
if (elem->qp == qp) {
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (grp->num_qp >= rxe->attr.max_mcast_qp_attach) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
elem = rxe_alloc(&rxe->mc_elem_pool);
|
|
if (!elem) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/* each qp holds a ref on the grp */
|
|
rxe_add_ref(grp);
|
|
|
|
grp->num_qp++;
|
|
elem->qp = qp;
|
|
elem->grp = grp;
|
|
|
|
list_add(&elem->qp_list, &grp->qp_list);
|
|
list_add(&elem->grp_list, &qp->grp_list);
|
|
|
|
err = 0;
|
|
out:
|
|
spin_unlock_bh(&grp->mcg_lock);
|
|
spin_unlock_bh(&qp->grp_lock);
|
|
return err;
|
|
}
|
|
|
|
int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
|
|
union ib_gid *mgid)
|
|
{
|
|
struct rxe_mc_grp *grp;
|
|
struct rxe_mc_elem *elem, *tmp;
|
|
|
|
grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
|
|
if (!grp)
|
|
goto err1;
|
|
|
|
spin_lock_bh(&qp->grp_lock);
|
|
spin_lock_bh(&grp->mcg_lock);
|
|
|
|
list_for_each_entry_safe(elem, tmp, &grp->qp_list, qp_list) {
|
|
if (elem->qp == qp) {
|
|
list_del(&elem->qp_list);
|
|
list_del(&elem->grp_list);
|
|
grp->num_qp--;
|
|
|
|
spin_unlock_bh(&grp->mcg_lock);
|
|
spin_unlock_bh(&qp->grp_lock);
|
|
rxe_drop_ref(elem);
|
|
rxe_drop_ref(grp); /* ref held by QP */
|
|
rxe_drop_ref(grp); /* ref from get_key */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&grp->mcg_lock);
|
|
spin_unlock_bh(&qp->grp_lock);
|
|
rxe_drop_ref(grp); /* ref from get_key */
|
|
err1:
|
|
return -EINVAL;
|
|
}
|
|
|
|
void rxe_drop_all_mcast_groups(struct rxe_qp *qp)
|
|
{
|
|
struct rxe_mc_grp *grp;
|
|
struct rxe_mc_elem *elem;
|
|
|
|
while (1) {
|
|
spin_lock_bh(&qp->grp_lock);
|
|
if (list_empty(&qp->grp_list)) {
|
|
spin_unlock_bh(&qp->grp_lock);
|
|
break;
|
|
}
|
|
elem = list_first_entry(&qp->grp_list, struct rxe_mc_elem,
|
|
grp_list);
|
|
list_del(&elem->grp_list);
|
|
spin_unlock_bh(&qp->grp_lock);
|
|
|
|
grp = elem->grp;
|
|
spin_lock_bh(&grp->mcg_lock);
|
|
list_del(&elem->qp_list);
|
|
grp->num_qp--;
|
|
spin_unlock_bh(&grp->mcg_lock);
|
|
rxe_drop_ref(grp);
|
|
rxe_drop_ref(elem);
|
|
}
|
|
}
|
|
|
|
void rxe_mc_cleanup(void *arg)
|
|
{
|
|
struct rxe_mc_grp *grp = arg;
|
|
struct rxe_dev *rxe = grp->rxe;
|
|
|
|
rxe_drop_key(grp);
|
|
rxe->ifc_ops->mcast_delete(rxe, &grp->mgid);
|
|
}
|