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Diffstat (limited to 'src/msg/async/dpdk/toeplitz.h')
| -rw-r--r-- | src/msg/async/dpdk/toeplitz.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/msg/async/dpdk/toeplitz.h b/src/msg/async/dpdk/toeplitz.h new file mode 100644 index 00000000..3ca38808 --- /dev/null +++ b/src/msg/async/dpdk/toeplitz.h @@ -0,0 +1,92 @@ +/* + * This file is open source software, licensed to you under the terms + * of the Apache License, Version 2.0 (the "License"). See the NOTICE file + * distributed with this work for additional information regarding copyright + * ownership. You may not use this file except in compliance with the License. + * + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +/*- + * Copyright (c) 2010 David Malone <dwmalone@FreeBSD.org> + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + */ + +#ifndef CEPH_MSG_TOEPLITZ_H_ +#define CEPH_MSG_TOEPLITZ_H_ + +#include <vector> + +using rss_key_type = std::vector<uint8_t>; + +// Mellanox Linux's driver key +static const rss_key_type default_rsskey_40bytes = { + 0xd1, 0x81, 0xc6, 0x2c, 0xf7, 0xf4, 0xdb, 0x5b, + 0x19, 0x83, 0xa2, 0xfc, 0x94, 0x3e, 0x1a, 0xdb, + 0xd9, 0x38, 0x9e, 0x6b, 0xd1, 0x03, 0x9c, 0x2c, + 0xa7, 0x44, 0x99, 0xad, 0x59, 0x3d, 0x56, 0xd9, + 0xf3, 0x25, 0x3c, 0x06, 0x2a, 0xdc, 0x1f, 0xfc +}; + +// Intel's i40e PMD default RSS key +static const rss_key_type default_rsskey_52bytes = { + 0x44, 0x39, 0x79, 0x6b, 0xb5, 0x4c, 0x50, 0x23, + 0xb6, 0x75, 0xea, 0x5b, 0x12, 0x4f, 0x9f, 0x30, + 0xb8, 0xa2, 0xc0, 0x3d, 0xdf, 0xdc, 0x4d, 0x02, + 0xa0, 0x8c, 0x9b, 0x33, 0x4a, 0xf6, 0x4a, 0x4c, + 0x05, 0xc6, 0xfa, 0x34, 0x39, 0x58, 0xd8, 0x55, + 0x7d, 0x99, 0x58, 0x3a, 0xe1, 0x38, 0xc9, 0x2e, + 0x81, 0x15, 0x03, 0x66 +}; + +template<typename T> +static inline uint32_t toeplitz_hash(const rss_key_type& key, const T& data) +{ + uint32_t hash = 0, v; + u_int i, b; + + /* XXXRW: Perhaps an assertion about key length vs. data length? */ + + v = (key[0]<<24) + (key[1]<<16) + (key[2] <<8) + key[3]; + for (i = 0; i < data.size(); i++) { + for (b = 0; b < 8; b++) { + if (data[i] & (1<<(7-b))) + hash ^= v; + v <<= 1; + if ((i + 4) < key.size() && + (key[i+4] & (1<<(7-b)))) + v |= 1; + } + } + return (hash); +} +#endif |