273 lines
7.9 KiB
C
273 lines
7.9 KiB
C
/*-
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* Copyright (c) 2014-2015 Sandvine Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/iov.h>
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#include <sys/dnv.h>
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#include <sys/nv.h>
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#include <err.h>
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#include <regex.h>
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#include <stdlib.h>
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#include "iovctl.h"
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/*
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* Returns a writeable pointer to the configuration for the given device.
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* If no configuration exists, a new nvlist with empty driver and iov
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* sections is allocated and returned.
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*
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* Returning a writeable pointer requires removing the configuration from config
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* using nvlist_take. It is the responsibility of the caller to re-insert the
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* nvlist in config with nvlist_move_nvlist.
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*/
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static nvlist_t *
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find_config(nvlist_t *config, const char * device)
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{
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nvlist_t *subsystem, *empty_driver, *empty_iov;
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subsystem = dnvlist_take_nvlist(config, device, NULL);
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if (subsystem != NULL)
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return (subsystem);
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empty_driver = nvlist_create(NV_FLAG_IGNORE_CASE);
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if (empty_driver == NULL)
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err(1, "Could not allocate config nvlist");
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empty_iov = nvlist_create(NV_FLAG_IGNORE_CASE);
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if (empty_iov == NULL)
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err(1, "Could not allocate config nvlist");
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subsystem = nvlist_create(NV_FLAG_IGNORE_CASE);
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if (subsystem == NULL)
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err(1, "Could not allocate config nvlist");
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nvlist_move_nvlist(subsystem, DRIVER_CONFIG_NAME, empty_driver);
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nvlist_move_nvlist(subsystem, IOV_CONFIG_NAME, empty_iov);
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return (subsystem);
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}
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static uint16_t
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parse_vf_num(const char *key, regmatch_t *matches)
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{
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u_long vf_num;
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vf_num = strtoul(key + matches[1].rm_so, NULL, 10);
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if (vf_num > UINT16_MAX)
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errx(1, "VF number %lu is too large to be valid",
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vf_num);
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return (vf_num);
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}
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/*
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* Apply the default values specified in device_defaults to the specified
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* subsystem in the given device_config.
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*
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* This function assumes that the values specified in device_defaults have
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* already been validated.
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*/
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static void
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apply_subsystem_defaults(nvlist_t *device_config, const char *subsystem,
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const nvlist_t *device_defaults)
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{
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nvlist_t *config;
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const nvlist_t *defaults;
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const char *name;
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void *cookie;
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size_t len;
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const void *bin;
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int type;
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config = nvlist_take_nvlist(device_config, subsystem);
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defaults = nvlist_get_nvlist(device_defaults, subsystem);
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cookie = NULL;
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while ((name = nvlist_next(defaults, &type, &cookie)) != NULL) {
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if (nvlist_exists(config, name))
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continue;
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switch (type) {
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case NV_TYPE_BOOL:
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nvlist_add_bool(config, name,
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nvlist_get_bool(defaults, name));
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break;
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case NV_TYPE_NUMBER:
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nvlist_add_number(config, name,
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nvlist_get_number(defaults, name));
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break;
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case NV_TYPE_STRING:
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nvlist_add_string(config, name,
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nvlist_get_string(defaults, name));
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break;
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case NV_TYPE_NVLIST:
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nvlist_add_nvlist(config, name,
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nvlist_get_nvlist(defaults, name));
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break;
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case NV_TYPE_BINARY:
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bin = nvlist_get_binary(defaults, name, &len);
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nvlist_add_binary(config, name, bin, len);
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break;
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default:
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errx(1, "Unexpected type '%d'", type);
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}
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}
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nvlist_move_nvlist(device_config, subsystem, config);
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}
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/*
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* Iterate over every subsystem in the given VF device and apply default values
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* for parameters that were not configured with a value.
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*
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* This function assumes that the values specified in defaults have already been
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* validated.
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*/
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static void
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apply_defaults(nvlist_t *vf, const nvlist_t *defaults)
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{
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apply_subsystem_defaults(vf, DRIVER_CONFIG_NAME, defaults);
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apply_subsystem_defaults(vf, IOV_CONFIG_NAME, defaults);
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}
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/*
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* Validate that all required parameters have been configured in the specified
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* subsystem.
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*/
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static void
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validate_subsystem(const nvlist_t *device, const nvlist_t *device_schema,
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const char *subsystem_name, const char *config_name)
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{
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const nvlist_t *subsystem, *schema, *config;
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const char *name;
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void *cookie;
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int type;
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subsystem = nvlist_get_nvlist(device, subsystem_name);
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schema = nvlist_get_nvlist(device_schema, subsystem_name);
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cookie = NULL;
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while ((name = nvlist_next(schema, &type, &cookie)) != NULL) {
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config = nvlist_get_nvlist(schema, name);
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if (dnvlist_get_bool(config, REQUIRED_SCHEMA_NAME, false)) {
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if (!nvlist_exists(subsystem, name))
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errx(1,
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"Required parameter '%s' not found in '%s'",
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name, config_name);
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}
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}
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}
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/*
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* Validate that all required parameters have been configured in all subsystems
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* in the device.
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*/
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static void
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validate_device(const nvlist_t *device, const nvlist_t *schema,
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const char *config_name)
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{
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validate_subsystem(device, schema, DRIVER_CONFIG_NAME, config_name);
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validate_subsystem(device, schema, IOV_CONFIG_NAME, config_name);
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}
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static uint16_t
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get_num_vfs(const nvlist_t *pf)
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{
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const nvlist_t *iov;
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iov = nvlist_get_nvlist(pf, IOV_CONFIG_NAME);
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return (nvlist_get_number(iov, "num_vfs"));
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}
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/*
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* Validates the configuration that has been parsed into config using the given
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* config schema. Note that the parser is required to not insert configuration
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* keys that are not valid in the schema, and to not insert configuration values
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* that are of the incorrect type. Therefore this function will not validate
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* either condition. This function is only responsible for inserting config
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* file defaults in individual VF sections and removing the DEFAULT_SCHEMA_NAME
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* subsystem from config, validating that all required parameters in the schema
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* are present in each PF and VF subsystem, and that there is no VF subsystem
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* section whose number exceeds num_vfs.
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*/
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void
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validate_config(nvlist_t *config, const nvlist_t *schema, const regex_t *vf_pat)
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{
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char device_name[VF_MAX_NAME];
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regmatch_t matches[2];
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nvlist_t *defaults, *pf, *vf;
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const nvlist_t *vf_schema;
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const char *key;
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void *cookie;
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int i, type;
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uint16_t vf_num, num_vfs;
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pf = find_config(config, PF_CONFIG_NAME);
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validate_device(pf, nvlist_get_nvlist(schema, PF_CONFIG_NAME),
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PF_CONFIG_NAME);
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nvlist_move_nvlist(config, PF_CONFIG_NAME, pf);
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num_vfs = get_num_vfs(pf);
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vf_schema = nvlist_get_nvlist(schema, VF_SCHEMA_NAME);
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if (num_vfs == 0)
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errx(1, "PF.num_vfs must be at least 1");
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defaults = dnvlist_take_nvlist(config, DEFAULT_SCHEMA_NAME, NULL);
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for (i = 0; i < num_vfs; i++) {
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snprintf(device_name, sizeof(device_name), VF_PREFIX"%d",
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i);
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vf = find_config(config, device_name);
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if (defaults != NULL)
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apply_defaults(vf, defaults);
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validate_device(vf, vf_schema, device_name);
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nvlist_move_nvlist(config, device_name, vf);
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}
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nvlist_destroy(defaults);
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cookie = NULL;
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while ((key = nvlist_next(config, &type, &cookie)) != NULL) {
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if (regexec(vf_pat, key, nitems(matches), matches, 0) == 0) {
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vf_num = parse_vf_num(key, matches);
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if (vf_num >= num_vfs)
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errx(1,
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"VF number %d is out of bounds (num_vfs=%d)",
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vf_num, num_vfs);
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}
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}
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}
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