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my_ibv_helper.h
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my_ibv_helper.h
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/*
* Copyright (c) 2019 Mellanox Technologies, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/types.h>
#include <dirent.h>
#pragma weak mlx5dv_reserved_qpn_alloc
extern int mlx5dv_reserved_qpn_alloc(struct ibv_context *ctx, uint32_t *qpn);
int (*_my_mlx5dv_reserved_qpn_alloc)(struct ibv_context *ctx, uint32_t *qpn) = mlx5dv_reserved_qpn_alloc;
int my_mlx5dv_reserved_qpn_alloc(struct ibv_context *ctx, uint32_t *qpn)
{
if (_my_mlx5dv_reserved_qpn_alloc) return _my_mlx5dv_reserved_qpn_alloc(ctx, qpn);
else return EOPNOTSUPP;
}
#pragma weak mlx5dv_reserved_qpn_dealloc
extern int mlx5dv_reserved_qpn_dealloc(struct ibv_context *ctx, uint32_t qpn);
int (*_my_mlx5dv_reserved_qpn_dealloc)(struct ibv_context *ctx, uint32_t qpn) = mlx5dv_reserved_qpn_dealloc;
int my_mlx5dv_reserved_qpn_dealloc(struct ibv_context *ctx, uint32_t qpn)
{
if (_my_mlx5dv_reserved_qpn_dealloc) return _my_mlx5dv_reserved_qpn_dealloc(ctx, qpn);
else return EOPNOTSUPP;
}
enum my_ibv_gid_type {
MY_IBV_GID_TYPE_IB_ROCE_V1,
MY_IBV_GID_TYPE_ROCE_V2,
};
static int my_ibv_read_sysfs_file(const char *dir, const char *file,
char *buf, size_t size)
{
char *path;
int fd;
int len;
if (asprintf(&path, "%s/%s", dir, file) < 0)
return -1;
fd = open(path, O_RDONLY | O_CLOEXEC);
if (fd < 0) {
free(path);
return -1;
}
len = read(fd, buf, size);
close(fd);
free(path);
if (len > 0) {
if (buf[len - 1] == '\n')
buf[--len] = '\0';
else if (len < size)
buf[len] = '\0';
else
/* We would have to truncate the contents to NULL
* terminate, so we are going to fail no matter
* what we do, either right now or later when
* we pass around an unterminated string. Fail now.
*/
return -1;
}
return len;
}
/* GID types as appear in sysfs, no change is expected as of ABI
* compatibility.
*/
#define V1_TYPE "IB/RoCE v1"
#define V2_TYPE "RoCE v2"
static int my_ibv_query_gid_type(struct ibv_context *context, uint8_t port_num,
unsigned int index, enum my_ibv_gid_type *type)
{
char name[32];
char buff[11];
snprintf(name, sizeof(name), "ports/%d/gid_attrs/types/%d", port_num,
index);
/* Reset errno so that we can rely on its value upon any error flow in
* ibv_read_sysfs_file.
*/
errno = 0;
if (my_ibv_read_sysfs_file(context->device->ibdev_path, name, buff,
sizeof(buff)) <= 0) {
char *dir_path;
DIR *dir;
if (errno == EINVAL) {
/* In IB, this file doesn't exist and the kernel sets
* errno to -EINVAL.
*/
*type = MY_IBV_GID_TYPE_IB_ROCE_V1;
return 0;
}
if (asprintf(&dir_path, "%s/%s/%d/%s/",
context->device->ibdev_path, "ports", port_num,
"gid_attrs") < 0)
return -1;
dir = opendir(dir_path);
free(dir_path);
if (!dir) {
if (errno == ENOENT)
/* Assuming that if gid_attrs doesn't exist,
* we have an old kernel and all GIDs are
* IB/RoCE v1
*/
*type = MY_IBV_GID_TYPE_IB_ROCE_V1;
else
return -1;
} else {
closedir(dir);
errno = EFAULT;
return -1;
}
} else {
if (!strcmp(buff, V1_TYPE)) {
*type = MY_IBV_GID_TYPE_IB_ROCE_V1;
} else if (!strcmp(buff, V2_TYPE)) {
*type = MY_IBV_GID_TYPE_ROCE_V2;
} else {
errno = ENOTSUP;
return -1;
}
}
return 0;
}
void my_ibv_find_gid_family(union ibv_gid *gid, int *gid_family)
{
if (gid->raw[0] == 0 && gid->raw[1] == 0)
*gid_family = AF_INET;
else
*gid_family = AF_INET6;
}
int my_ibv_find_sgid_type(struct ibv_context *context, uint8_t port_num,
enum my_ibv_gid_type gid_type, int gid_family)
{
enum my_ibv_gid_type sgid_type = 0;
union ibv_gid sgid;
int sgid_family = -1;
int idx = 0;
do {
if (ibv_query_gid(context, port_num, idx, &sgid)) {
errno = EFAULT;
return -1;
}
if (my_ibv_query_gid_type(context, port_num, idx, &sgid_type)) {
errno = EFAULT;
return -1;
}
my_ibv_find_gid_family(&sgid, &sgid_family);
if (gid_type == sgid_type && gid_family == sgid_family) {
return idx;
}
idx++;
} while (gid_type != sgid_type || gid_family != sgid_family);
return idx;
}