LXR linux/drivers/net/ethernet/mellanox/mlx5/core/lib/mpfs.h

   1/*
   2 * Copyright (c) 2017, Mellanox Technologies, Ltd.  All rights reserved.
   3 *
   4 * This software is available to you under a choice of one of two
   5 * licenses.  You may choose to be licensed under the terms of the GNU
   6 * General Public License (GPL) Version 2, available from the file
   7 * COPYING in the main directory of this source tree, or the
   8 * OpenIB.org BSD license below:
   9 *
  10 *     Redistribution and use in source and binary forms, with or
  11 *     without modification, are permitted provided that the following
  12 *     conditions are met:
  13 *
  14 *      - Redistributions of source code must retain the above
  15 *        copyright notice, this list of conditions and the following
  16 *        disclaimer.
  17 *
  18 *      - Redistributions in binary form must reproduce the above
  19 *        copyright notice, this list of conditions and the following
  20 *        disclaimer in the documentation and/or other materials
  21 *        provided with the distribution.
  22 *
  23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30 * SOFTWARE.
  31 */
  32
  33#ifndef __MLX5_MPFS_H__
  34#define __MLX5_MPFS_H__
  35
  36#include <linux/if_ether.h>
  37#include <linux/mlx5/device.h>
  38
  39/* L2 -mac address based- hash helpers */
  40#define MLX5_L2_ADDR_HASH_SIZE (BIT(BITS_PER_BYTE))
  41#define MLX5_L2_ADDR_HASH(addr) (addr[5])
  42
  43struct l2addr_node {
  44        struct hlist_node hlist;
  45        u8                addr[ETH_ALEN];
  46};
  47
  48#define for_each_l2hash_node(hn, tmp, hash, i) \
  49        for (i = 0; i < MLX5_L2_ADDR_HASH_SIZE; i++) \
  50                hlist_for_each_entry_safe(hn, tmp, &(hash)[i], hlist)
  51
  52#define l2addr_hash_find(hash, mac, type) ({                \
  53        int ix = MLX5_L2_ADDR_HASH(mac);                    \
  54        bool found = false;                                 \
  55        type *ptr = NULL;                                   \
  56                                                            \
  57        hlist_for_each_entry(ptr, &(hash)[ix], node.hlist)  \
  58                if (ether_addr_equal(ptr->node.addr, mac)) {\
  59                        found = true;                       \
  60                        break;                              \
  61                }                                           \
  62        if (!found)                                         \
  63                ptr = NULL;                                 \
  64        ptr;                                                \
  65})
  66
  67#define l2addr_hash_add(hash, mac, type, gfp) ({            \
  68        int ix = MLX5_L2_ADDR_HASH(mac);                    \
  69        type *ptr = NULL;                                   \
  70                                                            \
  71        ptr = kzalloc(sizeof(type), gfp);                   \
  72        if (ptr) {                                          \
  73                ether_addr_copy(ptr->node.addr, mac);       \
  74                hlist_add_head(&ptr->node.hlist, &(hash)[ix]);\
  75        }                                                   \
  76        ptr;                                                \
  77})
  78
  79#define l2addr_hash_del(ptr) ({                             \
  80        hlist_del(&(ptr)->node.hlist);                      \
  81        kfree(ptr);                                         \
  82})
  83
  84#ifdef CONFIG_MLX5_MPFS
  85int  mlx5_mpfs_init(struct mlx5_core_dev *dev);
  86void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev);
  87int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac);
  88int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac);
  89#else /* #ifndef CONFIG_MLX5_MPFS */
  90static inline int  mlx5_mpfs_init(struct mlx5_core_dev *dev) { return 0; }
  91static inline void mlx5_mpfs_cleanup(struct mlx5_core_dev *dev) {}
  92static inline int  mlx5_mpfs_add_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
  93static inline int  mlx5_mpfs_del_mac(struct mlx5_core_dev *dev, u8 *mac) { return 0; }
  94#endif
  95#endif
  96