lib: Add northbound ringbuffers

Fast path is split in north and southbound paths.

3 files changed, 49 insertions, 12 deletions

diff --git a/src/lib/dev.c b/src/lib/dev.c
index 17c473ed..25c3fcd4 100644
--- a/src/lib/dev.c
+++ b/src/lib/dev.c
@@ -112,7 +112,7 @@ int ap_init(char * ap_name)
                 return -1;
         }
 
-        _ap_instance->rb = shm_ap_rbuff_create();
+        _ap_instance->rb = shm_ap_rbuff_create_s();
         if (_ap_instance->rb == NULL) {
                 shm_rdrbuff_close(_ap_instance->rdrb);
                 bmp_destroy(_ap_instance->fds);
@@ -216,7 +216,7 @@ int flow_accept(char ** ae_name)
                 return -1;
         }
 
-        _ap_instance->flows[cfd].rb = shm_ap_rbuff_open(recv_msg->api);
+        _ap_instance->flows[cfd].rb = shm_ap_rbuff_open_n(recv_msg->api);
         if (_ap_instance->flows[cfd].rb == NULL) {
                 bmp_release(_ap_instance->fds, cfd);
                 pthread_rwlock_unlock(&_ap_instance->flows_lock);
@@ -347,7 +347,7 @@ int flow_alloc(char * dst_name,
                 return -1;
         }
 
-        _ap_instance->flows[fd].rb = shm_ap_rbuff_open(recv_msg->api);
+        _ap_instance->flows[fd].rb = shm_ap_rbuff_open_n(recv_msg->api);
         if (_ap_instance->flows[fd].rb == NULL) {
                 bmp_release(_ap_instance->fds, fd);
                 pthread_rwlock_unlock(&_ap_instance->flows_lock);
diff --git a/src/lib/shm_ap_rbuff.c b/src/lib/shm_ap_rbuff.c
index 77e288a8..6cc9590e 100644
--- a/src/lib/shm_ap_rbuff.c
+++ b/src/lib/shm_ap_rbuff.c
@@ -40,6 +40,10 @@
 #include <signal.h>
 #include <sys/stat.h>
 
+#define FN_MAX_CHARS 255
+#define NORTH false
+#define SOUTH true
+
 #define SHM_RBUFF_FILE_SIZE (SHM_BUFFER_SIZE * sizeof(struct rb_entry)         \
                              + 2 * sizeof(size_t) + sizeof(pthread_mutex_t)    \
                              + 2 * sizeof (pthread_cond_t))
@@ -59,19 +63,23 @@ struct shm_ap_rbuff {
         pthread_cond_t *  add;         /* SDU arrived */
         pthread_cond_t *  del;         /* SDU removed */
         pid_t             api;         /* api to which this rb belongs */
+        bool              dir;         /* direction, false = N */
         int               fd;
 };
 
-struct shm_ap_rbuff * shm_ap_rbuff_create()
+static struct shm_ap_rbuff * shm_ap_rbuff_create(bool dir)
 {
         struct shm_ap_rbuff * rb;
         int                   shm_fd;
         struct rb_entry *     shm_base;
         pthread_mutexattr_t   mattr;
         pthread_condattr_t    cattr;
-        char                  fn[25];
+        char                  fn[FN_MAX_CHARS];
 
-        sprintf(fn, SHM_AP_RBUFF_PREFIX "%d", getpid());
+        if (dir == SOUTH)
+                sprintf(fn, SHM_AP_RBUFF_PREFIX "south.%d", getpid());
+        else
+                sprintf(fn, SHM_AP_RBUFF_PREFIX "north.%d", getpid());
 
         rb = malloc(sizeof(*rb));
         if (rb == NULL) {
@@ -150,18 +158,22 @@ struct shm_ap_rbuff * shm_ap_rbuff_create()
 
         rb->fd  = shm_fd;
         rb->api = getpid();
+        rb->dir = dir;
 
         return rb;
 }
 
-struct shm_ap_rbuff * shm_ap_rbuff_open(pid_t api)
+static struct shm_ap_rbuff * shm_ap_rbuff_open(pid_t api, bool dir)
 {
         struct shm_ap_rbuff * rb;
         int                   shm_fd;
         struct rb_entry *     shm_base;
-        char                  fn[25];
+        char                  fn[FN_MAX_CHARS];
 
-        sprintf(fn, SHM_AP_RBUFF_PREFIX "%d", api);
+        if (dir == SOUTH)
+                sprintf(fn, SHM_AP_RBUFF_PREFIX "south.%d", api);
+        else
+                sprintf(fn, SHM_AP_RBUFF_PREFIX "north.%d", api);
 
         rb = malloc(sizeof(*rb));
         if (rb == NULL) {
@@ -204,9 +216,31 @@ struct shm_ap_rbuff * shm_ap_rbuff_open(pid_t api)
 
         rb->fd = shm_fd;
         rb->api = api;
+        rb->dir = dir;
 
         return rb;
 }
+
+struct shm_ap_rbuff * shm_ap_rbuff_create_n()
+{
+        return shm_ap_rbuff_create(NORTH);
+}
+
+struct shm_ap_rbuff * shm_ap_rbuff_create_s()
+{
+        return shm_ap_rbuff_create(SOUTH);
+}
+
+struct shm_ap_rbuff * shm_ap_rbuff_open_n(pid_t api)
+{
+        return shm_ap_rbuff_open(api, NORTH);
+}
+
+struct shm_ap_rbuff * shm_ap_rbuff_open_s(pid_t api)
+{
+        return shm_ap_rbuff_open(api, SOUTH);
+}
+
 void shm_ap_rbuff_close(struct shm_ap_rbuff * rb)
 {
         if (rb == NULL) {
@@ -252,7 +286,10 @@ void shm_ap_rbuff_destroy(struct shm_ap_rbuff * rb)
         if (close(rb->fd) < 0)
                 LOG_DBG("Couldn't close shared memory.");
 
-        sprintf(fn, SHM_AP_RBUFF_PREFIX "%d", rb->api);
+        if (rb->dir == SOUTH)
+                sprintf(fn, SHM_AP_RBUFF_PREFIX "south.%d", rb->api);
+        else
+                sprintf(fn, SHM_AP_RBUFF_PREFIX "north.%d", rb->api);
 
         if (munmap(rb->shm_base, SHM_RBUFF_FILE_SIZE) == -1)
                 LOG_DBG("Couldn't unmap shared memory.");
diff --git a/src/lib/shm_rdrbuff.c b/src/lib/shm_rdrbuff.c
index 93a889ce..07574f1a 100644
--- a/src/lib/shm_rdrbuff.c
+++ b/src/lib/shm_rdrbuff.c
@@ -139,13 +139,13 @@ static char * rdrb_filename(enum qos_cube qos)
                 ++chars;
         } while (qm > 0);
 
-        str = malloc(strlen(SHM_RDRB_PREFIX) + chars + 2);
+        str = malloc(strlen(SHM_RDRB_PREFIX) + chars + 1);
         if (str == NULL) {
                 LOG_ERR("Failed to create shm_rdrbuff: Out of Memory.");
                 return NULL;
         }
 
-        sprintf(str, "%s.%d", SHM_RDRB_PREFIX, (int) qos);
+        sprintf(str, "%s%d", SHM_RDRB_PREFIX, (int) qos);
 
         return str;
 }