Revert "vl: Fix to create migration object before block backends again"

[mirror_qemu.git] / net / tap-linux.c

diff --git a/net/tap-linux.c b/net/tap-linux.c
index a9531892a61a1e1db0c9351c93b882880968766d..535b1ddb61007aad516a0337eecefdc8c1cc1fd9 100644 (file)
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -23,6 +23,7 @@
  * THE SOFTWARE.
  */
 
+#include "qemu/osdep.h"
 #include "tap_int.h"
 #include "tap-linux.h"
 #include "net/tap.h"
@@ -31,31 +32,39 @@
 #include <sys/ioctl.h>
 
 #include "sysemu/sysemu.h"
-#include "qemu-common.h"
+#include "qapi/error.h"
 #include "qemu/error-report.h"
+#include "qemu/cutils.h"
 
 #define PATH_NET_TUN "/dev/net/tun"
 
 int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
-             int vnet_hdr_required, int mq_required)
+             int vnet_hdr_required, int mq_required, Error **errp)
 {
     struct ifreq ifr;
     int fd, ret;
     int len = sizeof(struct virtio_net_hdr);
+    unsigned int features;
 
     TFR(fd = open(PATH_NET_TUN, O_RDWR));
     if (fd < 0) {
-        error_report("could not open %s: %m", PATH_NET_TUN);
+        error_setg_errno(errp, errno, "could not open %s", PATH_NET_TUN);
         return -1;
     }
     memset(&ifr, 0, sizeof(ifr));
     ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
 
-    if (*vnet_hdr) {
-        unsigned int features;
+    if (ioctl(fd, TUNGETFEATURES, &features) == -1) {
+        warn_report("TUNGETFEATURES failed: %s", strerror(errno));
+        features = 0;
+    }
+
+    if (features & IFF_ONE_QUEUE) {
+        ifr.ifr_flags |= IFF_ONE_QUEUE;
+    }
 
-        if (ioctl(fd, TUNGETFEATURES, &features) == 0 &&
-            features & IFF_VNET_HDR) {
+    if (*vnet_hdr) {
+        if (features & IFF_VNET_HDR) {
             *vnet_hdr = 1;
             ifr.ifr_flags |= IFF_VNET_HDR;
         } else {
@@ -63,8 +72,8 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
         }
 
         if (vnet_hdr_required && !*vnet_hdr) {
-            error_report("vnet_hdr=1 requested, but no kernel "
-                         "support for IFF_VNET_HDR available");
+            error_setg(errp, "vnet_hdr=1 requested, but no kernel "
+                       "support for IFF_VNET_HDR available");
             close(fd);
             return -1;
         }
@@ -78,12 +87,9 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
     }
 
     if (mq_required) {
-        unsigned int features;
-
-        if ((ioctl(fd, TUNGETFEATURES, &features) != 0) ||
-            !(features & IFF_MULTI_QUEUE)) {
-            error_report("multiqueue required, but no kernel "
-                         "support for IFF_MULTI_QUEUE available");
+        if (!(features & IFF_MULTI_QUEUE)) {
+            error_setg(errp, "multiqueue required, but no kernel "
+                       "support for IFF_MULTI_QUEUE available");
             close(fd);
             return -1;
         } else {
@@ -98,9 +104,11 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
     ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
     if (ret != 0) {
         if (ifname[0] != '\0') {
-            error_report("could not configure %s (%s): %m", PATH_NET_TUN, ifr.ifr_name);
+            error_setg_errno(errp, errno, "could not configure %s (%s)",
+                             PATH_NET_TUN, ifr.ifr_name);
         } else {
-            error_report("could not configure %s: %m", PATH_NET_TUN);
+            error_setg_errno(errp, errno, "could not configure %s",
+                             PATH_NET_TUN);
         }
         close(fd);
         return -1;
@@ -122,7 +130,7 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
  */
 #define TAP_DEFAULT_SNDBUF 0
 
-int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
+void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp)
 {
     int sndbuf;
 
@@ -135,10 +143,8 @@ int tap_set_sndbuf(int fd, const NetdevTapOptions *tap)
     }
 
     if (ioctl(fd, TUNSETSNDBUF, &sndbuf) == -1 && tap->has_sndbuf) {
-        error_report("TUNSETSNDBUF ioctl failed: %s", strerror(errno));
-        return -1;
+        error_setg_errno(errp, errno, "TUNSETSNDBUF ioctl failed");
     }
-    return 0;
 }
 
 int tap_probe_vnet_hdr(int fd)
@@ -194,6 +200,40 @@ void tap_fd_set_vnet_hdr_len(int fd, int len)
     }
 }
 
+int tap_fd_set_vnet_le(int fd, int is_le)
+{
+    int arg = is_le ? 1 : 0;
+
+    if (!ioctl(fd, TUNSETVNETLE, &arg)) {
+        return 0;
+    }
+
+    /* Check if our kernel supports TUNSETVNETLE */
+    if (errno == EINVAL) {
+        return -errno;
+    }
+
+    error_report("TUNSETVNETLE ioctl() failed: %s.", strerror(errno));
+    abort();
+}
+
+int tap_fd_set_vnet_be(int fd, int is_be)
+{
+    int arg = is_be ? 1 : 0;
+
+    if (!ioctl(fd, TUNSETVNETBE, &arg)) {
+        return 0;
+    }
+
+    /* Check if our kernel supports TUNSETVNETBE */
+    if (errno == EINVAL) {
+        return -errno;
+    }
+
+    error_report("TUNSETVNETBE ioctl() failed: %s.", strerror(errno));
+    abort();
+}
+
 void tap_fd_set_offload(int fd, int csum, int tso4,
                         int tso6, int ecn, int ufo)
 {