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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"
#define RXE_POOL_TIMEOUT (200)
#define RXE_POOL_ALIGN (16)
static const struct rxe_type_info {
const char *name;
size_t size;
size_t elem_offset;
void (*cleanup)(struct rxe_pool_elem *elem);
u32 min_index;
u32 max_index;
u32 max_elem;
} rxe_type_info[RXE_NUM_TYPES] = {
[RXE_TYPE_UC] = {
.name = "uc",
.size = sizeof(struct rxe_ucontext),
.elem_offset = offsetof(struct rxe_ucontext, elem),
.min_index = 1,
.max_index = RXE_MAX_UCONTEXT,
.max_elem = RXE_MAX_UCONTEXT,
},
[RXE_TYPE_PD] = {
.name = "pd",
.size = sizeof(struct rxe_pd),
.elem_offset = offsetof(struct rxe_pd, elem),
.min_index = 1,
.max_index = RXE_MAX_PD,
.max_elem = RXE_MAX_PD,
},
[RXE_TYPE_AH] = {
.name = "ah",
.size = sizeof(struct rxe_ah),
.elem_offset = offsetof(struct rxe_ah, elem),
.min_index = RXE_MIN_AH_INDEX,
.max_index = RXE_MAX_AH_INDEX,
.max_elem = RXE_MAX_AH,
},
[RXE_TYPE_SRQ] = {
.name = "srq",
.size = sizeof(struct rxe_srq),
.elem_offset = offsetof(struct rxe_srq, elem),
.cleanup = rxe_srq_cleanup,
.min_index = RXE_MIN_SRQ_INDEX,
.max_index = RXE_MAX_SRQ_INDEX,
.max_elem = RXE_MAX_SRQ,
},
[RXE_TYPE_QP] = {
.name = "qp",
.size = sizeof(struct rxe_qp),
.elem_offset = offsetof(struct rxe_qp, elem),
.cleanup = rxe_qp_cleanup,
.min_index = RXE_MIN_QP_INDEX,
.max_index = RXE_MAX_QP_INDEX,
.max_elem = RXE_MAX_QP,
},
[RXE_TYPE_CQ] = {
.name = "cq",
.size = sizeof(struct rxe_cq),
.elem_offset = offsetof(struct rxe_cq, elem),
.cleanup = rxe_cq_cleanup,
.min_index = 1,
.max_index = RXE_MAX_CQ,
.max_elem = RXE_MAX_CQ,
},
[RXE_TYPE_MR] = {
.name = "mr",
.size = sizeof(struct rxe_mr),
.elem_offset = offsetof(struct rxe_mr, elem),
.cleanup = rxe_mr_cleanup,
.min_index = RXE_MIN_MR_INDEX,
.max_index = RXE_MAX_MR_INDEX,
.max_elem = RXE_MAX_MR,
},
[RXE_TYPE_MW] = {
.name = "mw",
.size = sizeof(struct rxe_mw),
.elem_offset = offsetof(struct rxe_mw, elem),
.cleanup = rxe_mw_cleanup,
.min_index = RXE_MIN_MW_INDEX,
.max_index = RXE_MAX_MW_INDEX,
.max_elem = RXE_MAX_MW,
},
};
void rxe_pool_init(struct rxe_dev *rxe, struct rxe_pool *pool,
enum rxe_elem_type type)
{
const struct rxe_type_info *info = &rxe_type_info[type];
memset(pool, 0, sizeof(*pool));
pool->rxe = rxe;
pool->name = info->name;
pool->type = type;
pool->max_elem = info->max_elem;
pool->elem_size = ALIGN(info->size, RXE_POOL_ALIGN);
pool->elem_offset = info->elem_offset;
pool->cleanup = info->cleanup;
atomic_set(&pool->num_elem, 0);
xa_init_flags(&pool->xa, XA_FLAGS_ALLOC);
pool->limit.min = info->min_index;
pool->limit.max = info->max_index;
}
void rxe_pool_cleanup(struct rxe_pool *pool)
{
WARN_ON(!xa_empty(&pool->xa));
}
int __rxe_add_to_pool(struct rxe_pool *pool, struct rxe_pool_elem *elem,
bool sleepable)
{
int err;
gfp_t gfp_flags;
if (atomic_inc_return(&pool->num_elem) > pool->max_elem)
goto err_cnt;
elem->pool = pool;
elem->obj = (u8 *)elem - pool->elem_offset;
kref_init(&elem->ref_cnt);
init_completion(&elem->complete);
/* AH objects are unique in that the create_ah verb
* can be called in atomic context. If the create_ah
* call is not sleepable use GFP_ATOMIC.
*/
gfp_flags = sleepable ? GFP_KERNEL : GFP_ATOMIC;
if (sleepable)
might_sleep();
err = xa_alloc_cyclic(&pool->xa, &elem->index, NULL, pool->limit,
&pool->next, gfp_flags);
if (err < 0)
goto err_cnt;
return 0;
err_cnt:
atomic_dec(&pool->num_elem);
return -EINVAL;
}
void *rxe_pool_get_index(struct rxe_pool *pool, u32 index)
{
struct rxe_pool_elem *elem;
struct xarray *xa = &pool->xa;
void *obj;
rcu_read_lock();
elem = xa_load(xa, index);
if (elem && kref_get_unless_zero(&elem->ref_cnt))
obj = elem->obj;
else
obj = NULL;
rcu_read_unlock();
return obj;
}
static void rxe_elem_release(struct kref *kref)
{
struct rxe_pool_elem *elem = container_of(kref, typeof(*elem), ref_cnt);
complete(&elem->complete);
}
int __rxe_cleanup(struct rxe_pool_elem *elem, bool sleepable)
{
struct rxe_pool *pool = elem->pool;
struct xarray *xa = &pool->xa;
static int timeout = RXE_POOL_TIMEOUT;
int ret, err = 0;
void *xa_ret;
if (sleepable)
might_sleep();
/* erase xarray entry to prevent looking up
* the pool elem from its index
*/
xa_ret = xa_erase(xa, elem->index);
WARN_ON(xa_err(xa_ret));
/* if this is the last call to rxe_put complete the
* object. It is safe to touch obj->elem after this since
* it is freed below
*/
__rxe_put(elem);
/* wait until all references to the object have been
* dropped before final object specific cleanup and
* return to rdma-core
*/
if (sleepable) {
if (!completion_done(&elem->complete) && timeout) {
ret = wait_for_completion_timeout(&elem->complete,
timeout);
/* Shouldn't happen. There are still references to
* the object but, rather than deadlock, free the
* object or pass back to rdma-core.
*/
if (WARN_ON(!ret))
err = -EINVAL;
}
} else {
unsigned long until = jiffies + timeout;
/* AH objects are unique in that the destroy_ah verb
* can be called in atomic context. This delay
* replaces the wait_for_completion call above
* when the destroy_ah call is not sleepable
*/
while (!completion_done(&elem->complete) &&
time_before(jiffies, until))
mdelay(1);
if (WARN_ON(!completion_done(&elem->complete)))
err = -EINVAL;
}
if (pool->cleanup)
pool->cleanup(elem);
atomic_dec(&pool->num_elem);
return err;
}
int __rxe_get(struct rxe_pool_elem *elem)
{
return kref_get_unless_zero(&elem->ref_cnt);
}
int __rxe_put(struct rxe_pool_elem *elem)
{
return kref_put(&elem->ref_cnt, rxe_elem_release);
}
void __rxe_finalize(struct rxe_pool_elem *elem)
{
void *xa_ret;
xa_ret = xa_store(&elem->pool->xa, elem->index, elem, GFP_KERNEL);
WARN_ON(xa_err(xa_ret));
}
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