1 /* SPDX-License-Identifier: BSD-3-Clause */
2 /* Copyright (c) 2024, Intel Corporation
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * 3. Neither the name of the Intel Corporation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /**
33 * @file ice_rss.h
34 * @brief default RSS values if kernel RSS is not enabled
35 *
36 * This header includes default definitions for RSS functionality if the
37 * kernel RSS interface is not enabled. This allows main driver code to avoid
38 * having to check the RSS ifdef throughout, but instead just use the RSS
39 * definitions, as they will fall back to these defaults when the kernel
40 * interface is disabled.
41 */
42 #ifndef _ICE_RSS_H_
43 #define _ICE_RSS_H_
44
45 #include <net/rss_config.h>
46
47 /* Make sure our key size buffer has enough space to store the kernel RSS key */
48 CTASSERT(ICE_AQC_GET_SET_RSS_KEY_DATA_RSS_KEY_SIZE >= RSS_KEYSIZE);
49
50 #ifdef RSS
51 /* RSS CPU/bucket mapping functions - only available with options RSS */
52 #else
53 /* Stub CPU/bucket functions when RSS not configured */
54 #define rss_getnumbuckets() (mp_ncpus)
55 #define rss_get_indirection_to_bucket(index) (index)
56
57 /**
58 * rss_hash2bucket - Determine the bucket for a given hash value
59 * @hash_val: the hash value to use
60 * @hash_type: the type of the hash
61 * @bucket_id: on success, updated with the bucket
62 *
63 * This function simply verifies that the hash type is known. If it is, then
64 * we forward the hash value directly as the bucket id. If the hash type is
65 * unknown, we return -1.
66 *
67 * This is the simplest mechanism for converting a hash value into a bucket,
68 * and does not support any form of indirection table.
69 */
70 static inline int
rss_hash2bucket(uint32_t hash_val,uint32_t hash_type,uint32_t * bucket_id)71 rss_hash2bucket(uint32_t hash_val, uint32_t hash_type, uint32_t *bucket_id)
72 {
73 switch (hash_type) {
74 case M_HASHTYPE_RSS_IPV4:
75 case M_HASHTYPE_RSS_TCP_IPV4:
76 case M_HASHTYPE_RSS_UDP_IPV4:
77 case M_HASHTYPE_RSS_IPV6:
78 case M_HASHTYPE_RSS_TCP_IPV6:
79 case M_HASHTYPE_RSS_UDP_IPV6:
80 *bucket_id = hash_val;
81 return (0);
82 default:
83 return (-1);
84 }
85 }
86 #endif /* !RSS */
87
88 #define ICE_DEFAULT_RSS_HASH_CONFIG \
89 ((u_int)(RSS_HASHTYPE_RSS_IPV4 | \
90 RSS_HASHTYPE_RSS_TCP_IPV4 | \
91 RSS_HASHTYPE_RSS_UDP_IPV4 | \
92 RSS_HASHTYPE_RSS_IPV6 | \
93 RSS_HASHTYPE_RSS_TCP_IPV6 | \
94 RSS_HASHTYPE_RSS_UDP_IPV6))
95
96 #endif /* _ICE_COMMON_COMPAT_H_ */
97