Line data    Source code

       1             : /*
       2             :  * vr_dpdk_filestore.c - implements a persistent store
       3             :  * to store/retrieve the VM feature set.
       4             :  *
       5             :  * Copyright (c) 2018 Juniper Networks, Inc. All rights reserved.
       6             :  * Copyright Contributors to the OpenSDN project
       7             :  */
       8             : 
       9             : #include <fcntl.h>
      10             : #include <sys/types.h>
      11             : #include <sys/stat.h>
      12             : #include <unistd.h>
      13             : #include <errno.h>
      14             : 
      15             : #include "vr_dpdk.h"
      16             : #define FEATURE_STORE_PATH "/var/lib/contrail/vm_feature"
      17             : 
      18           0 : int vr_dpdk_store_persist_feature(char *tapdev_name, unsigned long feature_set)
      19             : {
      20             :     char fname[NAME_MAX];
      21             :     struct stat fstat;
      22             :     FILE *fp;
      23             : 
      24           0 :     if (stat(FEATURE_STORE_PATH, &fstat) != 0) {
      25           0 :         if (mkdir(FEATURE_STORE_PATH, 0755) < 0) {
      26           0 :             RTE_LOG(ERR, USOCK, "mkdir failed with error %d\n", errno);
      27           0 :             return -1;
      28             :         }
      29             :     }
      30             : 
      31           0 :     if (snprintf(fname, NAME_MAX, FEATURE_STORE_PATH"/%s", tapdev_name) < 0)
      32           0 :         return -1;
      33             : 
      34             :     RTE_LOG_DP(DEBUG, USOCK, "Write persistent feature %s\n", fname);
      35             : 
      36           0 :     fp = fopen(fname, "w");
      37           0 :     if (fp == NULL) {
      38           0 :         return -1;
      39             :     }
      40           0 :     rewind(fp);
      41           0 :     fprintf(fp, "%016lx", feature_set);
      42           0 :     fclose(fp);
      43           0 :     return 0;
      44             : }
      45             : 
      46           0 : int vr_dpdk_load_persist_feature(char *tapdev_name, unsigned long *feature_set)
      47             : {
      48             :     char fname[NAME_MAX];
      49             :     struct stat fstat;
      50             :     FILE *fp;
      51             : 
      52           0 :     if (stat(FEATURE_STORE_PATH, &fstat) != 0) {
      53           0 :         if (mkdir(FEATURE_STORE_PATH, 0755) < 0) {
      54           0 :             RTE_LOG(ERR, USOCK, "mkdir failed with error %d\n", errno);
      55           0 :             return -1;
      56             :         }
      57             :     }
      58             : 
      59           0 :     if (snprintf(fname, NAME_MAX, FEATURE_STORE_PATH"/%s", tapdev_name) < 0)
      60           0 :         return -1;
      61             : 
      62             :     RTE_LOG_DP(DEBUG, USOCK, "Read persistent feature %s\n", fname);
      63             : 
      64           0 :     if (stat(fname, &fstat) == 0) {
      65           0 :         fp = fopen(fname, "r");
      66           0 :         if (fp == NULL) {
      67           0 :             return -1;
      68             :         }
      69           0 :         rewind(fp);
      70           0 :         if(fscanf(fp, "%016lx", feature_set) == EOF) {
      71           0 :             if (errno) {
      72           0 :                 RTE_LOG(ERR, USOCK, "EOF reached with error %d for tapdev %s\n",
      73             :                         errno, tapdev_name);
      74           0 :                 fclose(fp);
      75           0 :                 return -1;
      76             :             }
      77             :         }
      78             :         RTE_LOG_DP(DEBUG, USOCK, "Feature Set Read %lx for tapdev %s\n",
      79             :                    *feature_set, tapdev_name);
      80           0 :         fclose(fp);
      81           0 :         return 0;
      82             :     } else {
      83           0 :         return -1;
      84             :     }
      85             : }
      86             : 
      87           0 : void vr_dpdk_del_persist_feature(char *tapdev_name)
      88             : {
      89             :     char fname[NAME_MAX];
      90             :     struct stat fstat;
      91             : 
      92           0 :     if (snprintf(fname, NAME_MAX, FEATURE_STORE_PATH"/%s", tapdev_name) < 0)
      93           0 :         return;
      94             : 
      95           0 :     if (stat(fname, &fstat) == 0) {
      96           0 :         if(unlink(fname)) {
      97           0 :             RTE_LOG(ERR, USOCK, "Error deleting file %d for tapdev %s\n",
      98             :                     errno, tapdev_name);
      99             :         }
     100             :     }
     101             : }