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/* SPDX-License-Identifier: BSD-3-Clause */
/* Copyright (c) 2024, Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file ice_rss.h
* @brief default RSS values if kernel RSS is not enabled
*
* This header includes default definitions for RSS functionality if the
* kernel RSS interface is not enabled. This allows main driver code to avoid
* having to check the RSS ifdef throughout, but instead just use the RSS
* definitions, as they will fall back to these defaults when the kernel
* interface is disabled.
*/
#ifndef _ICE_RSS_H_
#define _ICE_RSS_H_
#include <net/rss_config.h>
/* Make sure our key size buffer has enough space to store the kernel RSS key */
CTASSERT(ICE_AQC_GET_SET_RSS_KEY_DATA_RSS_KEY_SIZE >= RSS_KEYSIZE);
#ifdef RSS
/* RSS CPU/bucket mapping functions - only available with options RSS */
#else
/* Stub CPU/bucket functions when RSS not configured */
#define rss_getnumbuckets() (mp_ncpus)
#define rss_get_indirection_to_bucket(index) (index)
/**
* rss_hash2bucket - Determine the bucket for a given hash value
* @hash_val: the hash value to use
* @hash_type: the type of the hash
* @bucket_id: on success, updated with the bucket
*
* This function simply verifies that the hash type is known. If it is, then
* we forward the hash value directly as the bucket id. If the hash type is
* unknown, we return -1.
*
* This is the simplest mechanism for converting a hash value into a bucket,
* and does not support any form of indirection table.
*/
static inline int
rss_hash2bucket(uint32_t hash_val, uint32_t hash_type, uint32_t *bucket_id)
{
switch (hash_type) {
case M_HASHTYPE_RSS_IPV4:
case M_HASHTYPE_RSS_TCP_IPV4:
case M_HASHTYPE_RSS_UDP_IPV4:
case M_HASHTYPE_RSS_IPV6:
case M_HASHTYPE_RSS_TCP_IPV6:
case M_HASHTYPE_RSS_UDP_IPV6:
*bucket_id = hash_val;
return (0);
default:
return (-1);
}
}
#endif /* !RSS */
#define ICE_DEFAULT_RSS_HASH_CONFIG \
((u_int)(RSS_HASHTYPE_RSS_IPV4 | \
RSS_HASHTYPE_RSS_TCP_IPV4 | \
RSS_HASHTYPE_RSS_UDP_IPV4 | \
RSS_HASHTYPE_RSS_IPV6 | \
RSS_HASHTYPE_RSS_TCP_IPV6 | \
RSS_HASHTYPE_RSS_UDP_IPV6))
#endif /* _ICE_COMMON_COMPAT_H_ */
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