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[Qemu-devel] [PATCH v3 33/46] ivshmem-server: use a uint16 for client ID
From: |
marcandre . lureau |
Subject: |
[Qemu-devel] [PATCH v3 33/46] ivshmem-server: use a uint16 for client ID |
Date: |
Tue, 15 Sep 2015 18:07:50 +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>
---
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 16ee583..972fda2 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 cd584fc..2176d5e 100644
--- a/contrib/ivshmem-server/ivshmem-server.h
+++ b/contrib/ivshmem-server/ivshmem-server.h
@@ -70,7 +70,7 @@ 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
- [Qemu-devel] [PATCH v3 27/46] ivshmem: fix pci_ivshmem_exit(), (continued)
- [Qemu-devel] [PATCH v3 27/46] ivshmem: fix pci_ivshmem_exit(), marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 26/46] ivshmem: add device description, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 28/46] ivshmem: replace 'guest' for 'peer' appropriately, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 29/46] ivshmem: error on too many eventfd received, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 30/46] ivshmem: reset mask on device reset, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 32/46] ivshmem-client: check the number of vectors, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 33/46] ivshmem-server: use a uint16 for client ID,
marcandre . lureau <=
- [Qemu-devel] [PATCH v3 31/46] contrib: add ivshmem client and server, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 34/46] ivshmem-server: fix hugetlbfs support, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 35/46] docs: update ivshmem device spec, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 36/46] ivshmem: add check on protocol version in QEMU, marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 38/46] msix: implement pba write (but read-only), marcandre . lureau, 2015/09/15
- [Qemu-devel] [PATCH v3 37/46] contrib: remove unnecessary strdup(), marcandre . lureau, 2015/09/15