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// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2022 Intel Corporation */
#include "adf_transport.h"
#include "qat_algs_send.h"
#include "qat_crypto.h"
#define ADF_MAX_RETRIES 20
static int qat_alg_send_message_retry(struct qat_alg_req *req)
{
int ret = 0, ctr = 0;
do {
ret = adf_send_message(req->tx_ring, req->fw_req);
} while (ret == -EAGAIN && ctr++ < ADF_MAX_RETRIES);
if (ret == -EAGAIN)
return -ENOSPC;
return -EINPROGRESS;
}
void qat_alg_send_backlog(struct qat_instance_backlog *backlog)
{
struct qat_alg_req *req, *tmp;
spin_lock_bh(&backlog->lock);
list_for_each_entry_safe(req, tmp, &backlog->list, list) {
if (adf_send_message(req->tx_ring, req->fw_req)) {
/* The HW ring is full. Do nothing.
* qat_alg_send_backlog() will be invoked again by
* another callback.
*/
break;
}
list_del(&req->list);
req->base->complete(req->base, -EINPROGRESS);
}
spin_unlock_bh(&backlog->lock);
}
static bool qat_alg_try_enqueue(struct qat_alg_req *req)
{
struct qat_instance_backlog *backlog = req->backlog;
struct adf_etr_ring_data *tx_ring = req->tx_ring;
u32 *fw_req = req->fw_req;
/* Check if any request is already backlogged */
if (!list_empty(&backlog->list))
return false;
/* Check if ring is nearly full */
if (adf_ring_nearly_full(tx_ring))
return false;
/* Try to enqueue to HW ring */
if (adf_send_message(tx_ring, fw_req))
return false;
return true;
}
static int qat_alg_send_message_maybacklog(struct qat_alg_req *req)
{
struct qat_instance_backlog *backlog = req->backlog;
int ret = -EINPROGRESS;
if (qat_alg_try_enqueue(req))
return ret;
spin_lock_bh(&backlog->lock);
if (!qat_alg_try_enqueue(req)) {
list_add_tail(&req->list, &backlog->list);
ret = -EBUSY;
}
spin_unlock_bh(&backlog->lock);
return ret;
}
int qat_alg_send_message(struct qat_alg_req *req)
{
u32 flags = req->base->flags;
if (flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
return qat_alg_send_message_maybacklog(req);
else
return qat_alg_send_message_retry(req);
}
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