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[Qemu-devel] [PULL v3 35/51] ivshmem-server: use a uint16 for client ID


From: marcandre . lureau
Subject: [Qemu-devel] [PULL v3 35/51] ivshmem-server: use a uint16 for client ID
Date: Tue, 13 Oct 2015 16:26:02 +0200

From: Marc-André Lureau <address@hidden>

In practice, the number of VM is limited to MAXUINT16 in ivshmem, so use
the same limit on the server (removes a theorical infinite loop)

Signed-off-by: Marc-André Lureau <address@hidden>
Reviewed-by: Claudio Fontana <address@hidden>
---
 contrib/ivshmem-server/ivshmem-server.c | 11 ++++++++++-
 contrib/ivshmem-server/ivshmem-server.h |  2 +-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/contrib/ivshmem-server/ivshmem-server.c 
b/contrib/ivshmem-server/ivshmem-server.c
index 9c4f196..ea2b65e 100644
--- a/contrib/ivshmem-server/ivshmem-server.c
+++ b/contrib/ivshmem-server/ivshmem-server.c
@@ -145,9 +145,18 @@ ivshmem_server_handle_new_conn(IvshmemServer *server)
     peer->sock_fd = newfd;
 
     /* get an unused peer id */
-    while (ivshmem_server_search_peer(server, server->cur_id) != NULL) {
+    /* XXX: this could use id allocation such as Linux IDA, or simply
+     * a free-list */
+    for (i = 0; i < G_MAXUINT16; i++) {
+        if (ivshmem_server_search_peer(server, server->cur_id) == NULL) {
+            break;
+        }
         server->cur_id++;
     }
+    if (i == G_MAXUINT16) {
+        IVSHMEM_SERVER_DEBUG(server, "cannot allocate new client id\n");
+        goto fail;
+    }
     peer->id = server->cur_id++;
 
     /* create eventfd, one per vector */
diff --git a/contrib/ivshmem-server/ivshmem-server.h 
b/contrib/ivshmem-server/ivshmem-server.h
index bf7de7a..83c751c 100644
--- a/contrib/ivshmem-server/ivshmem-server.h
+++ b/contrib/ivshmem-server/ivshmem-server.h
@@ -71,7 +71,7 @@ typedef struct IvshmemServer {
     size_t shm_size;                 /**< size of shm */
     int shm_fd;                      /**< shm file descriptor */
     unsigned n_vectors;              /**< number of vectors */
-    long cur_id;                     /**< id to be given to next client */
+    uint16_t cur_id;                 /**< id to be given to next client */
     bool verbose;                    /**< true in verbose mode */
     IvshmemServerPeerList peer_list; /**< list of peers */
 } IvshmemServer;
-- 
2.4.3




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