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