drivers/net/ethernet/netronome/nfp/nfp_shared_buf.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
   2 /*
   3  * Copyright (C) 2018 Netronome Systems, Inc.
   4  *
   5  * This software is dual licensed under the GNU General License Version 2,
   6  * June 1991 as shown in the file COPYING in the top-level directory of this
   7  * source tree or the BSD 2-Clause License provided below.  You have the
   8  * option to license this software under the complete terms of either license.
   9  *
  10  * The BSD 2-Clause License:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      1. Redistributions of source code must retain the above
  17  *         copyright notice, this list of conditions and the following
  18  *         disclaimer.
  19  *
  20  *      2. Redistributions in binary form must reproduce the above
  21  *         copyright notice, this list of conditions and the following
  22  *         disclaimer in the documentation and/or other materials
  23  *         provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <net/devlink.h>
  37
  38 #include "nfpcore/nfp_cpp.h"
  39 #include "nfpcore/nfp_nffw.h"
  40 #include "nfp_abi.h"
  41 #include "nfp_app.h"
  42 #include "nfp_main.h"
  43
  44 static u32 nfp_shared_buf_pool_unit(struct nfp_pf *pf, unsigned int sb)
  45 {
  46         __le32 sb_id = cpu_to_le32(sb);
  47         unsigned int i;
  48
  49         for (i = 0; i < pf->num_shared_bufs; i++)
  50                 if (pf->shared_bufs[i].id == sb_id)
  51                         return le32_to_cpu(pf->shared_bufs[i].pool_size_unit);
  52
  53         WARN_ON_ONCE(1);
  54         return 0;
  55 }
  56
  57 int nfp_shared_buf_pool_get(struct nfp_pf *pf, unsigned int sb, u16 pool_index,
  58                             struct devlink_sb_pool_info *pool_info)
  59 {
  60         struct nfp_shared_buf_pool_info_get get_data;
  61         struct nfp_shared_buf_pool_id id = {
  62                 .shared_buf     = cpu_to_le32(sb),
  63                 .pool           = cpu_to_le32(pool_index),
  64         };
  65         unsigned int unit_size;
  66         int n;
  67
  68         unit_size = nfp_shared_buf_pool_unit(pf, sb);
  69         if (!unit_size)
  70                 return -EINVAL;
  71
  72         n = nfp_mbox_cmd(pf, NFP_MBOX_POOL_GET, &id, sizeof(id),
  73                          &get_data, sizeof(get_data));
  74         if (n < 0)
  75                 return n;
  76         if (n < sizeof(get_data))
  77                 return -EIO;
  78
  79         pool_info->pool_type = le32_to_cpu(get_data.pool_type);
  80         pool_info->threshold_type = le32_to_cpu(get_data.threshold_type);
  81         pool_info->size = le32_to_cpu(get_data.size) * unit_size;
  82
  83         return 0;
  84 }
  85
  86 int nfp_shared_buf_pool_set(struct nfp_pf *pf, unsigned int sb,
  87                             u16 pool_index, u32 size,
  88                             enum devlink_sb_threshold_type threshold_type)
  89 {
  90         struct nfp_shared_buf_pool_info_set set_data = {
  91                 .id = {
  92                         .shared_buf     = cpu_to_le32(sb),
  93                         .pool           = cpu_to_le32(pool_index),
  94                 },
  95                 .threshold_type = cpu_to_le32(threshold_type),
  96         };
  97         unsigned int unit_size;
  98
  99         unit_size = nfp_shared_buf_pool_unit(pf, sb);
 100         if (!unit_size || size % unit_size)
 101                 return -EINVAL;
 102         set_data.size = cpu_to_le32(size / unit_size);
 103
 104         return nfp_mbox_cmd(pf, NFP_MBOX_POOL_SET, &set_data, sizeof(set_data),
 105                             NULL, 0);
 106 }
 107
 108 int nfp_shared_buf_register(struct nfp_pf *pf)
 109 {
 110         struct devlink *devlink = priv_to_devlink(pf);
 111         unsigned int i, num_entries, entry_sz;
 112         struct nfp_cpp_area *sb_desc_area;
 113         u8 __iomem *sb_desc;
 114         int n, err;
 115
 116         if (!pf->mbox)
 117                 return 0;
 118
 119         n = nfp_pf_rtsym_read_optional(pf, NFP_SHARED_BUF_COUNT_SYM_NAME, 0);
 120         if (n <= 0)
 121                 return n;
 122         num_entries = n;
 123
 124         sb_desc = nfp_pf_map_rtsym(pf, "sb_tbl", NFP_SHARED_BUF_TABLE_SYM_NAME,
 125                                    num_entries * sizeof(pf->shared_bufs[0]),
 126                                    &sb_desc_area);
 127         if (IS_ERR(sb_desc))
 128                 return PTR_ERR(sb_desc);
 129
 130         entry_sz = nfp_cpp_area_size(sb_desc_area) / num_entries;
 131
 132         pf->shared_bufs = kmalloc_array(num_entries, sizeof(pf->shared_bufs[0]),
 133                                         GFP_KERNEL);
 134         if (!pf->shared_bufs) {
 135                 err = -ENOMEM;
 136                 goto err_release_area;
 137         }
 138
 139         for (i = 0; i < num_entries; i++) {
 140                 struct nfp_shared_buf *sb = &pf->shared_bufs[i];
 141
 142                 /* Entries may be larger in future FW */
 143                 memcpy_fromio(sb, sb_desc + i * entry_sz, sizeof(*sb));
 144
 145                 err = devlink_sb_register(devlink,
 146                                           le32_to_cpu(sb->id),
 147                                           le32_to_cpu(sb->size),
 148                                           le16_to_cpu(sb->ingress_pools_count),
 149                                           le16_to_cpu(sb->egress_pools_count),
 150                                           le16_to_cpu(sb->ingress_tc_count),
 151                                           le16_to_cpu(sb->egress_tc_count));
 152                 if (err)
 153                         goto err_unreg_prev;
 154         }
 155         pf->num_shared_bufs = num_entries;
 156
 157         nfp_cpp_area_release_free(sb_desc_area);
 158
 159         return 0;
 160
 161 err_unreg_prev:
 162         while (i--)
 163                 devlink_sb_unregister(devlink,
 164                                       le32_to_cpu(pf->shared_bufs[i].id));
 165         kfree(pf->shared_bufs);
 166 err_release_area:
 167         nfp_cpp_area_release_free(sb_desc_area);
 168         return err;
 169 }
 170
 171 void nfp_shared_buf_unregister(struct nfp_pf *pf)
 172 {
 173         struct devlink *devlink = priv_to_devlink(pf);
 174         unsigned int i;
 175
 176         for (i = 0; i < pf->num_shared_bufs; i++)
 177                 devlink_sb_unregister(devlink,
 178                                       le32_to_cpu(pf->shared_bufs[i].id));
 179         kfree(pf->shared_bufs);
 180 }