tests: virtio-9p: wait for completion in the test code

In order to test request cancellation, we will need to send multiple
requests and wait for the associated replies. Since we poll the ISR
to know if a request completed, we may have several replies to parse
when we detect ISR was set to 1.

This patch moves the waiting out of the reply parsing path, up into
the functional tests.
Signed-off-by: NGreg Kurz <groug@kaod.org>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>

tests/virtio-9p-test.c

@@ -246,13 +246,17 @@ static const char *rmessage_name(uint8_t id)
         "<unknown>";
 }
 
-static void v9fs_req_recv(P9Req *req, uint8_t id)
+static void v9fs_req_wait_for_reply(P9Req *req)
 {
     QVirtIO9P *v9p = req->v9p;
-    P9Hdr hdr;
 
     qvirtio_wait_used_elem(v9p->dev, v9p->vq, req->free_head,
                            QVIRTIO_9P_TIMEOUT_US);
+}
+
+static void v9fs_req_recv(P9Req *req, uint8_t id)
+{
+    P9Hdr hdr;
 
     v9fs_memread(req, &hdr, 7);
     hdr.size = ldl_le_p(&hdr.size);
@@ -398,6 +402,7 @@ static void fs_version(QVirtIO9P *v9p)
     P9Req *req;
 
     req = v9fs_tversion(v9p, P9_MAX_SIZE, version, P9_NOTAG);
+    v9fs_req_wait_for_reply(req);
     v9fs_rversion(req, &server_len, &server_version);
 
     g_assert_cmpmem(server_version, server_len, version, strlen(version));
@@ -411,6 +416,7 @@ static void fs_attach(QVirtIO9P *v9p)
 
     fs_version(v9p);
     req = v9fs_tattach(v9p, 0, getuid(), 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rattach(req, NULL);
 }
 
@@ -431,6 +437,7 @@ static void fs_walk(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, P9_MAXWELEM, wnames, 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rwalk(req, &nwqid, &wqid);
 
     g_assert_cmpint(nwqid, ==, P9_MAXWELEM);
@@ -452,6 +459,7 @@ static void fs_walk_no_slash(QVirtIO9P *v9p)
 
     fs_attach(v9p);
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rlerror(req, &err);
 
     g_assert_cmpint(err, ==, ENOENT);
@@ -467,9 +475,11 @@ static void fs_walk_dotdot(QVirtIO9P *v9p)
 
     fs_version(v9p);
     req = v9fs_tattach(v9p, 0, getuid(), 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rattach(req, &root_qid);
 
     req = v9fs_twalk(v9p, 0, 1, 1, wnames, 0);
+    v9fs_req_wait_for_reply(req);
     v9fs_rwalk(req, NULL, &wqid); /* We now we'll get one qid */
 
     g_assert_cmpmem(&root_qid, 13, wqid[0], 13);