static int mlx4_alloc_resize_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
int entries)
{
int err;
if (cq->resize_buf)
return -EBUSY;
cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
if (!cq->resize_buf)
return -ENOMEM;
err = mlx4_ib_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
if (err) {
kfree(cq->resize_buf);
cq->resize_buf = NULL;
return err;
}
cq->resize_buf->cqe = entries - 1;
return 0;
}
struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector,
struct ib_ucontext *context,
struct ib_udata *udata)
{
struct mlx4_ib_dev *dev = to_mdev(ibdev);
struct mlx4_ib_cq *cq;
struct mlx4_uar *uar;
int err;
if (entries < 1 || entries > dev->dev->caps.max_cqes)
return ERR_PTR(-EINVAL);
cq = kmalloc(sizeof *cq, GFP_KERNEL);
if (!cq)
return ERR_PTR(-ENOMEM);
entries = roundup_pow_of_two(entries + 1);
cq->ibcq.cqe = entries - 1;
mutex_init(&cq->resize_mutex);
spin_lock_init(&cq->lock);
cq->resize_buf = NULL;
cq->resize_umem = NULL;
if (context) {
struct mlx4_ib_create_cq ucmd;
if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
err = -EFAULT;
goto err_cq;
}
err = mlx4_ib_get_cq_umem(dev, context, &cq->buf, &cq->umem,
ucmd.buf_addr, entries);
if (err)
goto err_cq;
err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
&cq->db);
if (err)
goto err_mtt;
uar = &to_mucontext(context)->uar;
} else {
err = mlx4_db_alloc(dev->dev, &cq->db, 1);
if (err)
goto err_cq;
cq->mcq.set_ci_db = cq->db.db;
cq->mcq.arm_db = cq->db.db + 1;
*cq->mcq.set_ci_db = 0;
*cq->mcq.arm_db = 0;
err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
if (err)
goto err_db;
uar = &dev->priv_uar;
}
err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
cq->db.dma, &cq->mcq, vector, 0);
if (err)
goto err_dbmap;
cq->mcq.comp = mlx4_ib_cq_comp;
cq->mcq.event = mlx4_ib_cq_event;
if (context)
if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
err = -EFAULT;
goto err_dbmap;
}
return &cq->ibcq;
err_dbmap:
if (context)
mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);
err_mtt:
mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
if (context)
ib_umem_release(cq->umem);
else
mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
err_db:
if (!context)
mlx4_db_free(dev->dev, &cq->db);
err_cq:
kfree(cq);
return ERR_PTR(err);
}
struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev,
const struct ib_cq_init_attr *attr,
struct ib_udata *udata)
{
int entries = attr->cqe;
int vector = attr->comp_vector;
struct mlx4_ib_dev *dev = to_mdev(ibdev);
struct mlx4_ib_cq *cq;
struct mlx4_uar *uar;
void *buf_addr;
int err;
struct mlx4_ib_ucontext *context = rdma_udata_to_drv_context(
udata, struct mlx4_ib_ucontext, ibucontext);
if (entries < 1 || entries > dev->dev->caps.max_cqes)
return ERR_PTR(-EINVAL);
if (attr->flags & ~CQ_CREATE_FLAGS_SUPPORTED)
return ERR_PTR(-EINVAL);
cq = kzalloc(sizeof(*cq), GFP_KERNEL);
if (!cq)
return ERR_PTR(-ENOMEM);
entries = roundup_pow_of_two(entries + 1);
cq->ibcq.cqe = entries - 1;
mutex_init(&cq->resize_mutex);
spin_lock_init(&cq->lock);
cq->resize_buf = NULL;
cq->resize_umem = NULL;
cq->create_flags = attr->flags;
INIT_LIST_HEAD(&cq->send_qp_list);
INIT_LIST_HEAD(&cq->recv_qp_list);
if (udata) {
struct mlx4_ib_create_cq ucmd;
if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
err = -EFAULT;
goto err_cq;
}
buf_addr = (void *)(unsigned long)ucmd.buf_addr;
err = mlx4_ib_get_cq_umem(dev, udata, &cq->buf, &cq->umem,
ucmd.buf_addr, entries);
if (err)
goto err_cq;
err = mlx4_ib_db_map_user(udata, ucmd.db_addr, &cq->db);
if (err)
goto err_mtt;
uar = &context->uar;
cq->mcq.usage = MLX4_RES_USAGE_USER_VERBS;
} else {
err = mlx4_db_alloc(dev->dev, &cq->db, 1);
if (err)
goto err_cq;
cq->mcq.set_ci_db = cq->db.db;
cq->mcq.arm_db = cq->db.db + 1;
*cq->mcq.set_ci_db = 0;
*cq->mcq.arm_db = 0;
err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
if (err)
goto err_db;
buf_addr = &cq->buf.buf;
uar = &dev->priv_uar;
cq->mcq.usage = MLX4_RES_USAGE_DRIVER;
}
if (dev->eq_table)
vector = dev->eq_table[vector % ibdev->num_comp_vectors];
err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar, cq->db.dma,
&cq->mcq, vector, 0,
!!(cq->create_flags &
IB_UVERBS_CQ_FLAGS_TIMESTAMP_COMPLETION),
buf_addr, !!udata);
if (err)
goto err_dbmap;
if (udata)
cq->mcq.tasklet_ctx.comp = mlx4_ib_cq_comp;
else
cq->mcq.comp = mlx4_ib_cq_comp;
cq->mcq.event = mlx4_ib_cq_event;
if (udata)
if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
err = -EFAULT;
goto err_cq_free;
}
return &cq->ibcq;
err_cq_free:
mlx4_cq_free(dev->dev, &cq->mcq);
err_dbmap:
if (udata)
mlx4_ib_db_unmap_user(context, &cq->db);
err_mtt:
mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
if (udata)
ib_umem_release(cq->umem);
else
mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
err_db:
if (!udata)
mlx4_db_free(dev->dev, &cq->db);
err_cq:
kfree(cq);
return ERR_PTR(err);
}
