1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
2 /* Copyright(c) 2022 Intel Corporation */
3 #include <crypto/algapi.h>
4 #include "adf_transport.h"
5 #include "qat_algs_send.h"
6 #include "qat_crypto.h"
7 
8 #define ADF_MAX_RETRIES		20
9 
10 static int qat_alg_send_message_retry(struct qat_alg_req *req)
11 {
12 	int ret = 0, ctr = 0;
13 
14 	do {
15 		ret = adf_send_message(req->tx_ring, req->fw_req);
16 	} while (ret == -EAGAIN && ctr++ < ADF_MAX_RETRIES);
17 
18 	if (ret == -EAGAIN)
19 		return -ENOSPC;
20 
21 	return -EINPROGRESS;
22 }
23 
24 void qat_alg_send_backlog(struct qat_instance_backlog *backlog)
25 {
26 	struct qat_alg_req *req, *tmp;
27 
28 	spin_lock_bh(&backlog->lock);
29 	list_for_each_entry_safe(req, tmp, &backlog->list, list) {
30 		if (adf_send_message(req->tx_ring, req->fw_req)) {
31 			/* The HW ring is full. Do nothing.
32 			 * qat_alg_send_backlog() will be invoked again by
33 			 * another callback.
34 			 */
35 			break;
36 		}
37 		list_del(&req->list);
38 		crypto_request_complete(req->base, -EINPROGRESS);
39 	}
40 	spin_unlock_bh(&backlog->lock);
41 }
42 
43 static bool qat_alg_try_enqueue(struct qat_alg_req *req)
44 {
45 	struct qat_instance_backlog *backlog = req->backlog;
46 	struct adf_etr_ring_data *tx_ring = req->tx_ring;
47 	u32 *fw_req = req->fw_req;
48 
49 	/* Check if any request is already backlogged */
50 	if (!list_empty(&backlog->list))
51 		return false;
52 
53 	/* Check if ring is nearly full */
54 	if (adf_ring_nearly_full(tx_ring))
55 		return false;
56 
57 	/* Try to enqueue to HW ring */
58 	if (adf_send_message(tx_ring, fw_req))
59 		return false;
60 
61 	return true;
62 }
63 
64 
65 static int qat_alg_send_message_maybacklog(struct qat_alg_req *req)
66 {
67 	struct qat_instance_backlog *backlog = req->backlog;
68 	int ret = -EINPROGRESS;
69 
70 	if (qat_alg_try_enqueue(req))
71 		return ret;
72 
73 	spin_lock_bh(&backlog->lock);
74 	if (!qat_alg_try_enqueue(req)) {
75 		list_add_tail(&req->list, &backlog->list);
76 		ret = -EBUSY;
77 	}
78 	spin_unlock_bh(&backlog->lock);
79 
80 	return ret;
81 }
82 
83 int qat_alg_send_message(struct qat_alg_req *req)
84 {
85 	u32 flags = req->base->flags;
86 
87 	if (flags & CRYPTO_TFM_REQ_MAY_BACKLOG)
88 		return qat_alg_send_message_maybacklog(req);
89 	else
90 		return qat_alg_send_message_retry(req);
91 }
92