d6b92ffa99
kernel APIs. List of sources used: 1) rdma-core was cloned from "https://github.com/linux-rdma/rdma-core.git" Top commit d65138ef93af30b3ea249f3a84aa6a24ba7f8a75 2) OpenSM was cloned from git://git.openfabrics.org/~halr/opensm.git Top commit 85f841cf209f791c89a075048a907020e924528d 3) libibmad was cloned from "git://git.openfabrics.org/~iraweiny/libibmad.git" Tag 1.3.13 with some additional patches from Mellanox. 4) infiniband-diags was cloned from "git://git.openfabrics.org/~iraweiny/infiniband-diags.git" Tag 1.6.7 with some additional patches from Mellanox. Added the required Makefiles for building and installing. Sponsored by: Mellanox Technologies
149 lines
3.7 KiB
C
149 lines
3.7 KiB
C
/*
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* Copyright (c) 2012 Mellanox Technologies, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#define _GNU_SOURCE
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#include <config.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <string.h>
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#include "mlx5.h"
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struct mlx5_db_page {
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struct mlx5_db_page *prev, *next;
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struct mlx5_buf buf;
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int num_db;
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int use_cnt;
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unsigned long free[0];
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};
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static struct mlx5_db_page *__add_page(struct mlx5_context *context)
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{
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struct mlx5_db_page *page;
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int ps = to_mdev(context->ibv_ctx.device)->page_size;
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int pp;
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int i;
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int nlong;
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pp = ps / context->cache_line_size;
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nlong = (pp + 8 * sizeof(long) - 1) / (8 * sizeof(long));
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page = malloc(sizeof *page + nlong * sizeof(long));
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if (!page)
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return NULL;
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if (mlx5_alloc_buf(&page->buf, ps, ps)) {
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free(page);
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return NULL;
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}
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page->num_db = pp;
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page->use_cnt = 0;
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for (i = 0; i < nlong; ++i)
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page->free[i] = ~0;
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page->prev = NULL;
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page->next = context->db_list;
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context->db_list = page;
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if (page->next)
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page->next->prev = page;
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return page;
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}
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uint32_t *mlx5_alloc_dbrec(struct mlx5_context *context)
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{
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struct mlx5_db_page *page;
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uint32_t *db = NULL;
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int i, j;
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pthread_mutex_lock(&context->db_list_mutex);
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for (page = context->db_list; page; page = page->next)
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if (page->use_cnt < page->num_db)
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goto found;
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page = __add_page(context);
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if (!page)
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goto out;
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found:
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++page->use_cnt;
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for (i = 0; !page->free[i]; ++i)
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/* nothing */;
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j = ffsl(page->free[i]);
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--j;
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page->free[i] &= ~(1UL << j);
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db = page->buf.buf + (i * 8 * sizeof(long) + j) * context->cache_line_size;
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out:
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pthread_mutex_unlock(&context->db_list_mutex);
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return db;
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}
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void mlx5_free_db(struct mlx5_context *context, uint32_t *db)
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{
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struct mlx5_db_page *page;
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uintptr_t ps = to_mdev(context->ibv_ctx.device)->page_size;
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int i;
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pthread_mutex_lock(&context->db_list_mutex);
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for (page = context->db_list; page; page = page->next)
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if (((uintptr_t) db & ~(ps - 1)) == (uintptr_t) page->buf.buf)
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break;
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if (!page)
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goto out;
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i = ((void *) db - page->buf.buf) / context->cache_line_size;
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page->free[i / (8 * sizeof(long))] |= 1UL << (i % (8 * sizeof(long)));
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if (!--page->use_cnt) {
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if (page->prev)
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page->prev->next = page->next;
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else
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context->db_list = page->next;
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if (page->next)
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page->next->prev = page->prev;
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mlx5_free_buf(&page->buf);
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free(page);
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}
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out:
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pthread_mutex_unlock(&context->db_list_mutex);
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}
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