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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
*/
#include "rxe.h"
#include "rxe_loc.h"
static int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
{
unsigned char ll_addr[ETH_ALEN];
ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
return dev_mc_add(rxe->ndev, ll_addr);
}
static int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
{
unsigned char ll_addr[ETH_ALEN];
ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr);
return dev_mc_del(rxe->ndev, ll_addr);
}
/* caller should hold mc_grp_pool->pool_lock */
static struct rxe_mcg *create_grp(struct rxe_dev *rxe,
struct rxe_pool *pool,
union ib_gid *mgid)
{
int err;
struct rxe_mcg *grp;
grp = rxe_alloc_locked(&rxe->mc_grp_pool);
if (!grp)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&grp->qp_list);
spin_lock_init(&grp->mcg_lock);
grp->rxe = rxe;
rxe_add_key_locked(grp, mgid);
err = rxe_mcast_add(rxe, mgid);
if (unlikely(err)) {
rxe_drop_key_locked(grp);
rxe_drop_ref(grp);
return ERR_PTR(err);
}
return grp;
}
static int rxe_mcast_get_grp(struct rxe_dev *rxe, union ib_gid *mgid,
struct rxe_mcg **grp_p)
{
int err;
struct rxe_mcg *grp;
struct rxe_pool *pool = &rxe->mc_grp_pool;
if (rxe->attr.max_mcast_qp_attach == 0)
return -EINVAL;
write_lock_bh(&pool->pool_lock);
grp = rxe_pool_get_key_locked(pool, mgid);
if (grp)
goto done;
grp = create_grp(rxe, pool, mgid);
if (IS_ERR(grp)) {
write_unlock_bh(&pool->pool_lock);
err = PTR_ERR(grp);
return err;
}
done:
write_unlock_bh(&pool->pool_lock);
*grp_p = grp;
return 0;
}
static int rxe_mcast_add_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
struct rxe_mcg *grp)
{
int err;
struct rxe_mca *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_locked(&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;
atomic_inc(&qp->mcg_num);
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;
}
static int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
union ib_gid *mgid)
{
struct rxe_mcg *grp;
struct rxe_mca *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--;
atomic_dec(&qp->mcg_num);
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_mcg *grp;
struct rxe_mca *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_mca,
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(struct rxe_pool_elem *elem)
{
struct rxe_mcg *grp = container_of(elem, typeof(*grp), elem);
struct rxe_dev *rxe = grp->rxe;
rxe_drop_key(grp);
rxe_mcast_delete(rxe, &grp->mgid);
}
int rxe_attach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid)
{
int err;
struct rxe_dev *rxe = to_rdev(ibqp->device);
struct rxe_qp *qp = to_rqp(ibqp);
struct rxe_mcg *grp;
/* takes a ref on grp if successful */
err = rxe_mcast_get_grp(rxe, mgid, &grp);
if (err)
return err;
err = rxe_mcast_add_grp_elem(rxe, qp, grp);
rxe_drop_ref(grp);
return err;
}
int rxe_detach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid)
{
struct rxe_dev *rxe = to_rdev(ibqp->device);
struct rxe_qp *qp = to_rqp(ibqp);
return rxe_mcast_drop_grp_elem(rxe, qp, mgid);
}
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