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8700e3e7c4
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>
191 lines
4.4 KiB
C
191 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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int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid,
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struct rxe_mc_grp **grp_p)
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{
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int err;
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struct rxe_mc_grp *grp;
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if (rxe->attr.max_mcast_qp_attach == 0) {
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err = -EINVAL;
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goto err1;
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}
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grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
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if (grp)
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goto done;
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grp = rxe_alloc(&rxe->mc_grp_pool);
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if (!grp) {
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err = -ENOMEM;
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goto err1;
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}
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INIT_LIST_HEAD(&grp->qp_list);
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spin_lock_init(&grp->mcg_lock);
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grp->rxe = rxe;
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rxe_add_key(grp, mgid);
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err = rxe->ifc_ops->mcast_add(rxe, mgid);
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if (err)
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goto err2;
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done:
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*grp_p = grp;
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return 0;
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err2:
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rxe_drop_ref(grp);
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err1:
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return err;
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}
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int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
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struct rxe_mc_grp *grp)
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{
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int err;
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struct rxe_mc_elem *elem;
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/* check to see of the qp is already a member of the group */
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spin_lock_bh(&qp->grp_lock);
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spin_lock_bh(&grp->mcg_lock);
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list_for_each_entry(elem, &grp->qp_list, qp_list) {
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if (elem->qp == qp) {
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err = 0;
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goto out;
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}
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}
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if (grp->num_qp >= rxe->attr.max_mcast_qp_attach) {
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err = -ENOMEM;
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goto out;
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}
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elem = rxe_alloc(&rxe->mc_elem_pool);
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if (!elem) {
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err = -ENOMEM;
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goto out;
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}
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/* each qp holds a ref on the grp */
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rxe_add_ref(grp);
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grp->num_qp++;
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elem->qp = qp;
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elem->grp = grp;
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list_add(&elem->qp_list, &grp->qp_list);
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list_add(&elem->grp_list, &qp->grp_list);
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err = 0;
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out:
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spin_unlock_bh(&grp->mcg_lock);
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spin_unlock_bh(&qp->grp_lock);
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return err;
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}
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int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
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union ib_gid *mgid)
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{
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struct rxe_mc_grp *grp;
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struct rxe_mc_elem *elem, *tmp;
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grp = rxe_pool_get_key(&rxe->mc_grp_pool, mgid);
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if (!grp)
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goto err1;
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spin_lock_bh(&qp->grp_lock);
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spin_lock_bh(&grp->mcg_lock);
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list_for_each_entry_safe(elem, tmp, &grp->qp_list, qp_list) {
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if (elem->qp == qp) {
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list_del(&elem->qp_list);
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list_del(&elem->grp_list);
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grp->num_qp--;
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spin_unlock_bh(&grp->mcg_lock);
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spin_unlock_bh(&qp->grp_lock);
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rxe_drop_ref(elem);
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rxe_drop_ref(grp); /* ref held by QP */
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rxe_drop_ref(grp); /* ref from get_key */
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return 0;
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}
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}
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spin_unlock_bh(&grp->mcg_lock);
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spin_unlock_bh(&qp->grp_lock);
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rxe_drop_ref(grp); /* ref from get_key */
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err1:
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return -EINVAL;
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}
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void rxe_drop_all_mcast_groups(struct rxe_qp *qp)
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{
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struct rxe_mc_grp *grp;
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struct rxe_mc_elem *elem;
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while (1) {
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spin_lock_bh(&qp->grp_lock);
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if (list_empty(&qp->grp_list)) {
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spin_unlock_bh(&qp->grp_lock);
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break;
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}
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elem = list_first_entry(&qp->grp_list, struct rxe_mc_elem,
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grp_list);
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list_del(&elem->grp_list);
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spin_unlock_bh(&qp->grp_lock);
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grp = elem->grp;
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spin_lock_bh(&grp->mcg_lock);
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list_del(&elem->qp_list);
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grp->num_qp--;
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spin_unlock_bh(&grp->mcg_lock);
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rxe_drop_ref(grp);
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rxe_drop_ref(elem);
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}
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}
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void rxe_mc_cleanup(void *arg)
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{
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struct rxe_mc_grp *grp = arg;
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struct rxe_dev *rxe = grp->rxe;
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rxe_drop_key(grp);
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rxe->ifc_ops->mcast_delete(rxe, &grp->mgid);
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}
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