ceph/src/spdk/dpdk/lib/librte_eal/include/rte_devargs.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2014 6WIND S.A.
   3  */
   4
   5 #ifndef _RTE_DEVARGS_H_
   6 #define _RTE_DEVARGS_H_
   7
   8 /**
   9  * @file
  10  *
  11  * RTE devargs: list of devices and their user arguments
  12  *
  13  * This file stores a list of devices and their arguments given by
  14  * the user when a DPDK application is started. These devices can be PCI
  15  * devices or virtual devices. These devices are stored at startup in a
  16  * list of rte_devargs structures.
  17  */
  18
  19 #ifdef __cplusplus
  20 extern "C" {
  21 #endif
  22
  23 #include <stdio.h>
  24 #include <sys/queue.h>
  25 #include <rte_compat.h>
  26 #include <rte_bus.h>
  27
  28 /**
  29  * Type of generic device
  30  */
  31 enum rte_devtype {
  32         RTE_DEVTYPE_WHITELISTED_PCI,
  33         RTE_DEVTYPE_BLACKLISTED_PCI,
  34         RTE_DEVTYPE_VIRTUAL,
  35 };
  36
  37 /**
  38  * Structure that stores a device given by the user with its arguments
  39  *
  40  * A user device is a physical or a virtual device given by the user to
  41  * the DPDK application at startup through command line arguments.
  42  *
  43  * The structure stores the configuration of the device, its PCI
  44  * identifier if it's a PCI device or the driver name if it's a virtual
  45  * device.
  46  */
  47 struct rte_devargs {
  48         /** Next in list. */
  49         TAILQ_ENTRY(rte_devargs) next;
  50         /** Type of device. */
  51         enum rte_devtype type;
  52         /** Device policy. */
  53         enum rte_dev_policy policy;
  54         /** Name of the device. */
  55         char name[RTE_DEV_NAME_MAX_LEN];
  56         RTE_STD_C11
  57         union {
  58         /** Arguments string as given by user or "" for no argument. */
  59                 char *args;
  60                 const char *drv_str;
  61         };
  62         struct rte_bus *bus; /**< bus handle. */
  63         struct rte_class *cls; /**< class handle. */
  64         const char *bus_str; /**< bus-related part of device string. */
  65         const char *cls_str; /**< class-related part of device string. */
  66         const char *data; /**< Device string storage. */
  67 };
  68
  69 /**
  70  * Parse a device string.
  71  *
  72  * Verify that a bus is capable of handling the device passed
  73  * in argument. Store which bus will handle the device, its name
  74  * and the eventual device parameters.
  75  *
  76  * The syntax is:
  77  *
  78  *     bus:device_identifier,arg1=val1,arg2=val2
  79  *
  80  * where "bus:" is the bus name followed by any character separator.
  81  * The bus name is optional. If no bus name is specified, each bus
  82  * will attempt to recognize the device identifier. The first one
  83  * to succeed will be used.
  84  *
  85  * Examples:
  86  *
  87  *     pci:0000:05.00.0,arg=val
  88  *     05.00.0,arg=val
  89  *     vdev:net_ring0
  90  *
  91  * @param da
  92  *   The devargs structure holding the device information.
  93  *
  94  * @param dev
  95  *   String describing a device.
  96  *
  97  * @return
  98  *   - 0 on success.
  99  *   - Negative errno on error.
 100  */
 101 int
 102 rte_devargs_parse(struct rte_devargs *da, const char *dev);
 103
 104 /**
 105  * Parse a device string.
 106  *
 107  * Verify that a bus is capable of handling the device passed
 108  * in argument. Store which bus will handle the device, its name
 109  * and the eventual device parameters.
 110  *
 111  * The device string is built with a printf-like syntax.
 112  *
 113  * The syntax is:
 114  *
 115  *     bus:device_identifier,arg1=val1,arg2=val2
 116  *
 117  * where "bus:" is the bus name followed by any character separator.
 118  * The bus name is optional. If no bus name is specified, each bus
 119  * will attempt to recognize the device identifier. The first one
 120  * to succeed will be used.
 121  *
 122  * Examples:
 123  *
 124  *     pci:0000:05.00.0,arg=val
 125  *     05.00.0,arg=val
 126  *     vdev:net_ring0
 127  *
 128  * @param da
 129  *   The devargs structure holding the device information.
 130  * @param format
 131  *   Format string describing a device.
 132  *
 133  * @return
 134  *   - 0 on success.
 135  *   - Negative errno on error.
 136  */
 137 int
 138 rte_devargs_parsef(struct rte_devargs *da,
 139                    const char *format, ...)
 140 __rte_format_printf(2, 0);
 141
 142 /**
 143  * Insert an rte_devargs in the global list.
 144  *
 145  * @param da
 146  *  The devargs structure to insert.
 147  *  If a devargs for the same device is already inserted,
 148  *  it will be updated and returned. It means *da pointer can change.
 149  *
 150  * @return
 151  *   - 0 on success
 152  *   - Negative on error.
 153  */
 154 int
 155 rte_devargs_insert(struct rte_devargs **da);
 156
 157 /**
 158  * Add a device to the user device list
 159  * See rte_devargs_parse() for details.
 160  *
 161  * @param devtype
 162  *   The type of the device.
 163  * @param devargs_str
 164  *   The arguments as given by the user.
 165  *
 166  * @return
 167  *   - 0 on success
 168  *   - A negative value on error
 169  */
 170 int rte_devargs_add(enum rte_devtype devtype, const char *devargs_str);
 171
 172 /**
 173  * Remove a device from the user device list.
 174  * Its resources are freed.
 175  * If the devargs cannot be found, nothing happens.
 176  *
 177  * @param devargs
 178  *   The instance or a copy of devargs to remove.
 179  *
 180  * @return
 181  *   0 on success.
 182  *   <0 on error.
 183  *   >0 if the devargs was not within the user device list.
 184  */
 185 int rte_devargs_remove(struct rte_devargs *devargs);
 186
 187 /**
 188  * Count the number of user devices of a specified type
 189  *
 190  * @param devtype
 191  *   The type of the devices to counted.
 192  *
 193  * @return
 194  *   The number of devices.
 195  */
 196 unsigned int
 197 rte_devargs_type_count(enum rte_devtype devtype);
 198
 199 /**
 200  * This function dumps the list of user device and their arguments.
 201  *
 202  * @param f
 203  *   A pointer to a file for output
 204  */
 205 void rte_devargs_dump(FILE *f);
 206
 207 /**
 208  * Find next rte_devargs matching the provided bus name.
 209  *
 210  * @param busname
 211  *   Limit the iteration to devargs related to buses
 212  *   matching this name.
 213  *   Will return any next rte_devargs if NULL.
 214  *
 215  * @param start
 216  *   Starting iteration point. The iteration will start at
 217  *   the first rte_devargs if NULL.
 218  *
 219  * @return
 220  *   Next rte_devargs entry matching the requested bus,
 221  *   NULL if there is none.
 222  */
 223 struct rte_devargs *
 224 rte_devargs_next(const char *busname, const struct rte_devargs *start);
 225
 226 /**
 227  * Iterate over all rte_devargs for a specific bus.
 228  */
 229 #define RTE_EAL_DEVARGS_FOREACH(busname, da) \
 230         for (da = rte_devargs_next(busname, NULL); \
 231              da != NULL; \
 232              da = rte_devargs_next(busname, da)) \
 233
 234 #ifdef __cplusplus
 235 }
 236 #endif
 237
 238 #endif /* _RTE_DEVARGS_H_ */