ceph/src/dpdk/examples/vm_power_manager/channel_manager.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef CHANNEL_MANAGER_H_
  35 #define CHANNEL_MANAGER_H_
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 #include <linux/limits.h>
  42 #include <sys/un.h>
  43 #include <rte_atomic.h>
  44
  45 /* Maximum number of CPUs */
  46 #define CHANNEL_CMDS_MAX_CPUS        64
  47 #if CHANNEL_CMDS_MAX_CPUS > 64
  48 #error Maximum number of cores is 64, overflow is guaranteed to \
  49     cause problems with VM Power Management
  50 #endif
  51
  52 /* Maximum name length including '\0' terminator */
  53 #define CHANNEL_MGR_MAX_NAME_LEN    64
  54
  55 /* Maximum number of channels to each Virtual Machine */
  56 #define CHANNEL_MGR_MAX_CHANNELS    64
  57
  58 /* Hypervisor Path for libvirt(qemu/KVM) */
  59 #define CHANNEL_MGR_DEFAULT_HV_PATH "qemu:///system"
  60
  61 /* File socket directory */
  62 #define CHANNEL_MGR_SOCKET_PATH     "/tmp/powermonitor/"
  63
  64 #ifndef UNIX_PATH_MAX
  65 struct sockaddr_un _sockaddr_un;
  66 #define UNIX_PATH_MAX sizeof(_sockaddr_un.sun_path)
  67 #endif
  68
  69 /* Communication Channel Status */
  70 enum channel_status { CHANNEL_MGR_CHANNEL_DISCONNECTED = 0,
  71         CHANNEL_MGR_CHANNEL_CONNECTED,
  72         CHANNEL_MGR_CHANNEL_DISABLED,
  73         CHANNEL_MGR_CHANNEL_PROCESSING};
  74
  75 /* VM libvirt(qemu/KVM) connection status */
  76 enum vm_status { CHANNEL_MGR_VM_INACTIVE = 0, CHANNEL_MGR_VM_ACTIVE};
  77
  78 /*
  79  *  Represents a single and exclusive VM channel that exists between a guest and
  80  *  the host.
  81  */
  82 struct channel_info {
  83         char channel_path[UNIX_PATH_MAX]; /**< Path to host socket */
  84         volatile uint32_t status;    /**< Connection status(enum channel_status) */
  85         int fd;                      /**< AF_UNIX socket fd */
  86         unsigned channel_num;        /**< CHANNEL_MGR_SOCKET_PATH/<vm_name>.channel_num */
  87         void *priv_info;             /**< Pointer to private info, do not modify */
  88 };
  89
  90 /* Represents a single VM instance used to return internal information about
  91  * a VM */
  92 struct vm_info {
  93         char name[CHANNEL_MGR_MAX_NAME_LEN];          /**< VM name */
  94         enum vm_status status;                        /**< libvirt status */
  95         uint64_t pcpu_mask[CHANNEL_CMDS_MAX_CPUS];    /**< pCPU mask for each vCPU */
  96         unsigned num_vcpus;                           /**< number of vCPUS */
  97         struct channel_info channels[CHANNEL_MGR_MAX_CHANNELS]; /**< Array of channel_info */
  98         unsigned num_channels;                        /**< Number of channels */
  99 };
 100
 101 /**
 102  * Initialize the Channel Manager resources and connect to the Hypervisor
 103  * specified in path.
 104  * This must be successfully called first before calling any other functions.
 105  * It must only be call once;
 106  *
 107  * @param path
 108  *  Must be a local path, e.g. qemu:///system.
 109  *
 110  * @return
 111  *  - 0 on success.
 112  *  - Negative on error.
 113  */
 114 int channel_manager_init(const char *path);
 115
 116 /**
 117  * Free resources associated with the Channel Manager.
 118  *
 119  * @param path
 120  *  Must be a local path, e.g. qemu:///system.
 121  *
 122  * @return
 123  *  None
 124  */
 125 void channel_manager_exit(void);
 126
 127 /**
 128  * Get the Physical CPU mask for VM lcore channel(vcpu), result is assigned to
 129  * core_mask.
 130  * It is not thread-safe.
 131  *
 132  * @param chan_info
 133  *  Pointer to struct channel_info
 134  *
 135  * @param vcpu
 136  *  The virtual CPU to query.
 137  *
 138  *
 139  * @return
 140  *  - 0 on error.
 141  *  - >0 on success.
 142  */
 143 uint64_t get_pcpus_mask(struct channel_info *chan_info, unsigned vcpu);
 144
 145 /**
 146  * Set the Physical CPU mask for the specified vCPU.
 147  * It is not thread-safe.
 148  *
 149  * @param name
 150  *  Virtual Machine name to lookup
 151  *
 152  * @param vcpu
 153  *  The virtual CPU to set.
 154  *
 155  * @param core_mask
 156  *  The core mask of the physical CPU(s) to bind the vCPU
 157  *
 158  * @return
 159  *  - 0 on success.
 160  *  - Negative on error.
 161  */
 162 int set_pcpus_mask(char *vm_name, unsigned vcpu, uint64_t core_mask);
 163
 164 /**
 165  * Set the Physical CPU for the specified vCPU.
 166  * It is not thread-safe.
 167  *
 168  * @param name
 169  *  Virtual Machine name to lookup
 170  *
 171  * @param vcpu
 172  *  The virtual CPU to set.
 173  *
 174  * @param core_num
 175  *  The core number of the physical CPU(s) to bind the vCPU
 176  *
 177  * @return
 178  *  - 0 on success.
 179  *  - Negative on error.
 180  */
 181 int set_pcpu(char *vm_name, unsigned vcpu, unsigned core_num);
 182 /**
 183  * Add a VM as specified by name to the Channel Manager. The name must
 184  * correspond to a valid libvirt domain name.
 185  * This is required prior to adding channels.
 186  * It is not thread-safe.
 187  *
 188  * @param name
 189  *  Virtual Machine name to lookup.
 190  *
 191  * @return
 192  *  - 0 on success.
 193  *  - Negative on error.
 194  */
 195 int add_vm(const char *name);
 196
 197 /**
 198  * Remove a previously added Virtual Machine from the Channel Manager
 199  * It is not thread-safe.
 200  *
 201  * @param name
 202  *  Virtual Machine name to lookup.
 203  *
 204  * @return
 205  *  - 0 on success.
 206  *  - Negative on error.
 207  */
 208 int remove_vm(const char *name);
 209
 210 /**
 211  * Add all available channels to the VM as specified by name.
 212  * Channels in the form of paths
 213  * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
 214  * It is not thread-safe.
 215  *
 216  * @param name
 217  *  Virtual Machine name to lookup.
 218  *
 219  * @return
 220  *  - N the number of channels added for the VM
 221  */
 222 int add_all_channels(const char *vm_name);
 223
 224 /**
 225  * Add the channel numbers in channel_list to the domain specified by name.
 226  * Channels in the form of paths
 227  * (CHANNEL_MGR_SOCKET_PATH/<vm_name>.<channel_number>) will only be parsed.
 228  * It is not thread-safe.
 229  *
 230  * @param name
 231  *  Virtual Machine name to add channels.
 232  *
 233  * @param channel_list
 234  *  Pointer to list of unsigned integers, representing the channel number to add
 235  *  It must be allocated outside of this function.
 236  *
 237  * @param num_channels
 238  *  The amount of channel numbers in channel_list
 239  *
 240  * @return
 241  *  - N the number of channels added for the VM
 242  *  - 0 for error
 243  */
 244 int add_channels(const char *vm_name, unsigned *channel_list,
 245                 unsigned num_channels);
 246
 247 /**
 248  * Remove a channel definition from the channel manager. This must only be
 249  * called from the channel monitor thread.
 250  *
 251  * @param chan_info
 252  *  Pointer to a valid struct channel_info.
 253  *
 254  * @return
 255  *  - 0 on success.
 256  *  - Negative on error.
 257  */
 258 int remove_channel(struct channel_info **chan_info_dptr);
 259
 260 /**
 261  * For all channels associated with a Virtual Machine name, update the
 262  * connection status. Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
 263  * CHANNEL_MGR_CHANNEL_DISABLED only.
 264  *
 265  *
 266  * @param name
 267  *  Virtual Machine name to modify all channels.
 268  *
 269  * @param status
 270  *  The status to set each channel
 271  *
 272  * @param num_channels
 273  *  The amount of channel numbers in channel_list
 274  *
 275  * @return
 276  *  - N the number of channels added for the VM
 277  *  - 0 for error
 278  */
 279 int set_channel_status_all(const char *name, enum channel_status status);
 280
 281 /**
 282  * For all channels in channel_list associated with a Virtual Machine name
 283  * update the connection status of each.
 284  * Valid states are CHANNEL_MGR_CHANNEL_CONNECTED or
 285  * CHANNEL_MGR_CHANNEL_DISABLED only.
 286  * It is not thread-safe.
 287  *
 288  * @param name
 289  *  Virtual Machine name to add channels.
 290  *
 291  * @param channel_list
 292  *  Pointer to list of unsigned integers, representing the channel numbers to
 293  *  modify.
 294  *  It must be allocated outside of this function.
 295  *
 296  * @param num_channels
 297  *  The amount of channel numbers in channel_list
 298  *
 299  * @return
 300  *  - N the number of channels modified for the VM
 301  *  - 0 for error
 302  */
 303 int set_channel_status(const char *vm_name, unsigned *channel_list,
 304                 unsigned len_channel_list, enum channel_status status);
 305
 306 /**
 307  * Populates a pointer to struct vm_info associated with vm_name.
 308  *
 309  * @param vm_name
 310  *  The name of the virtual machine to lookup.
 311  *
 312  *  @param vm_info
 313  *   Pointer to a struct vm_info, this must be allocated prior to calling this
 314  *   function.
 315  *
 316  * @return
 317  *  - 0 on success.
 318  *  - Negative on error.
 319  */
 320 int get_info_vm(const char *vm_name, struct vm_info *info);
 321
 322 #ifdef __cplusplus
 323 }
 324 #endif
 325
 326 #endif /* CHANNEL_MANAGER_H_ */