net: move tap_set_sndbuf() to tap-linux.c

TUNSETSNDBUF is only available on linux

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

net/tap-aix.c

@@ -30,3 +30,9 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
     fprintf(stderr, "no tap on AIX\n");
     return -1;
 }
+
+int tap_set_sndbuf(int fd, QemuOpts *opts)
+{
+    return 0;
+}
+

net/tap-bsd.c

@@ -60,3 +60,8 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
     fcntl(fd, F_SETFL, O_NONBLOCK);
     return fd;
 }
+
+int tap_set_sndbuf(int fd, QemuOpts *opts)
+{
+    return 0;
+}

net/tap-linux.c

@@ -76,3 +76,26 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
     fcntl(fd, F_SETFL, O_NONBLOCK);
     return fd;
 }
+
+/* sndbuf should be set to a value lower than the tx queue
+ * capacity of any destination network interface.
+ * Ethernet NICs generally have txqueuelen=1000, so 1Mb is
+ * a good default, given a 1500 byte MTU.
+ */
+#define TAP_DEFAULT_SNDBUF 1024*1024
+
+int tap_set_sndbuf(int fd, QemuOpts *opts)
+{
+    int sndbuf;
+
+    sndbuf = qemu_opt_get_size(opts, "sndbuf", TAP_DEFAULT_SNDBUF);
+    if (!sndbuf) {
+        sndbuf = INT_MAX;
+    }
+
+    if (ioctl(fd, TUNSETSNDBUF, &sndbuf) == -1 && qemu_opt_get(opts, "sndbuf")) {
+        qemu_error("TUNSETSNDBUF ioctl failed: %s\n", strerror(errno));
+        return -1;
+    }
+    return 0;
+}

net/tap-solaris.c

@@ -183,3 +183,8 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required
     fcntl(fd, F_SETFL, O_NONBLOCK);
     return fd;
 }
+
+int tap_set_sndbuf(int fd, QemuOpts *opts)
+{
+    return 0;
+}

net/tap.c

@@ -209,29 +209,6 @@ static void tap_send(void *opaque)
     } while (size > 0);
 }
 
-/* sndbuf should be set to a value lower than the tx queue
- * capacity of any destination network interface.
- * Ethernet NICs generally have txqueuelen=1000, so 1Mb is
- * a good default, given a 1500 byte MTU.
- */
-#define TAP_DEFAULT_SNDBUF 1024*1024
-
-static int tap_set_sndbuf(TAPState *s, QemuOpts *opts)
-{
-    int sndbuf;
-
-    sndbuf = qemu_opt_get_size(opts, "sndbuf", TAP_DEFAULT_SNDBUF);
-    if (!sndbuf) {
-        sndbuf = INT_MAX;
-    }
-
-    if (ioctl(s->fd, TUNSETSNDBUF, &sndbuf) == -1 && qemu_opt_get(opts, "sndbuf")) {
-        qemu_error("TUNSETSNDBUF ioctl failed: %s\n", strerror(errno));
-        return -1;
-    }
-    return 0;
-}
-
 int tap_has_ufo(VLANClientState *vc)
 {
     TAPState *s = vc->opaque;
@@ -465,7 +442,7 @@ int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan
         return -1;
     }
 
-    if (tap_set_sndbuf(s, opts) < 0) {
+    if (tap_set_sndbuf(s->fd, opts) < 0) {
         return -1;
     }
 

net/tap.h

@@ -43,4 +43,6 @@ int tap_has_vnet_hdr(VLANClientState *vc);
 void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr);
 void tap_set_offload(VLANClientState *vc, int csum, int tso4, int tso6, int ecn, int ufo);
 
+int tap_set_sndbuf(int fd, QemuOpts *opts);
+
 #endif /* QEMU_NET_TAP_H */