Merge remote-tracking branch 'remotes/sstabellini/tags/xen-20170202' into staging

[mirror_qemu.git] / net / netmap.c

diff --git a/net/netmap.c b/net/netmap.c
index 27295ab2e269d1049f124e4ebd95b0dd2f4015f1..2d11a8f4befac2e81b8e35da3f28c56e7f148610 100644 (file)
--- a/net/netmap.c
+++ b/net/netmap.c
@@ -23,11 +23,9 @@
  */
 
 
+#include "qemu/osdep.h"
 #include <sys/ioctl.h>
 #include <net/if.h>
-#include <sys/mman.h>
-#include <stdint.h>
-#include <stdio.h>
 #define NETMAP_WITH_LIBS
 #include <net/netmap.h>
 #include <net/netmap_user.h>
@@ -37,7 +35,9 @@
 #include "clients.h"
 #include "sysemu/sysemu.h"
 #include "qemu/error-report.h"
+#include "qapi/error.h"
 #include "qemu/iov.h"
+#include "qemu/cutils.h"
 
 typedef struct NetmapState {
     NetClientState      nc;
@@ -324,20 +324,47 @@ static void netmap_cleanup(NetClientState *nc)
 }
 
 /* Offloading manipulation support callbacks. */
-static bool netmap_has_ufo(NetClientState *nc)
+static int netmap_fd_set_vnet_hdr_len(NetmapState *s, int len)
 {
-    return true;
+    struct nmreq req;
+
+    /* Issue a NETMAP_BDG_VNET_HDR command to change the virtio-net header
+     * length for the netmap adapter associated to 's->ifname'.
+     */
+    memset(&req, 0, sizeof(req));
+    pstrcpy(req.nr_name, sizeof(req.nr_name), s->ifname);
+    req.nr_version = NETMAP_API;
+    req.nr_cmd = NETMAP_BDG_VNET_HDR;
+    req.nr_arg1 = len;
+
+    return ioctl(s->nmd->fd, NIOCREGIF, &req);
 }
 
-static bool netmap_has_vnet_hdr(NetClientState *nc)
+static bool netmap_has_vnet_hdr_len(NetClientState *nc, int len)
 {
+    NetmapState *s = DO_UPCAST(NetmapState, nc, nc);
+    int prev_len = s->vnet_hdr_len;
+
+    /* Check that we can set the new length. */
+    if (netmap_fd_set_vnet_hdr_len(s, len)) {
+        return false;
+    }
+
+    /* Restore the previous length. */
+    if (netmap_fd_set_vnet_hdr_len(s, prev_len)) {
+        error_report("Failed to restore vnet-hdr length %d on %s: %s",
+                     prev_len, s->ifname, strerror(errno));
+        abort();
+    }
+
     return true;
 }
 
-static bool netmap_has_vnet_hdr_len(NetClientState *nc, int len)
+/* A netmap interface that supports virtio-net headers always
+ * supports UFO, so we use this callback also for the has_ufo hook. */
+static bool netmap_has_vnet_hdr(NetClientState *nc)
 {
-    return len == 0 || len == sizeof(struct virtio_net_hdr) ||
-                len == sizeof(struct virtio_net_hdr_mrg_rxbuf);
+    return netmap_has_vnet_hdr_len(nc, sizeof(struct virtio_net_hdr));
 }
 
 static void netmap_using_vnet_hdr(NetClientState *nc, bool enable)
@@ -348,20 +375,11 @@ static void netmap_set_vnet_hdr_len(NetClientState *nc, int len)
 {
     NetmapState *s = DO_UPCAST(NetmapState, nc, nc);
     int err;
-    struct nmreq req;
 
-    /* Issue a NETMAP_BDG_VNET_HDR command to change the virtio-net header
-     * length for the netmap adapter associated to 's->ifname'.
-     */
-    memset(&req, 0, sizeof(req));
-    pstrcpy(req.nr_name, sizeof(req.nr_name), s->ifname);
-    req.nr_version = NETMAP_API;
-    req.nr_cmd = NETMAP_BDG_VNET_HDR;
-    req.nr_arg1 = len;
-    err = ioctl(s->nmd->fd, NIOCREGIF, &req);
+    err = netmap_fd_set_vnet_hdr_len(s, len);
     if (err) {
-        error_report("Unable to execute NETMAP_BDG_VNET_HDR on %s: %s",
-                     s->ifname, strerror(errno));
+        error_report("Unable to set vnet-hdr length %d on %s: %s",
+                     len, s->ifname, strerror(errno));
     } else {
         /* Keep track of the current length. */
         s->vnet_hdr_len = len;
@@ -374,8 +392,7 @@ static void netmap_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
     NetmapState *s = DO_UPCAST(NetmapState, nc, nc);
 
     /* Setting a virtio-net header length greater than zero automatically
-     * enables the offloadings.
-     */
+     * enables the offloadings. */
     if (!s->vnet_hdr_len) {
         netmap_set_vnet_hdr_len(nc, sizeof(struct virtio_net_hdr));
     }
@@ -383,13 +400,13 @@ static void netmap_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
 
 /* NetClientInfo methods */
 static NetClientInfo net_netmap_info = {
-    .type = NET_CLIENT_OPTIONS_KIND_NETMAP,
+    .type = NET_CLIENT_DRIVER_NETMAP,
     .size = sizeof(NetmapState),
     .receive = netmap_receive,
     .receive_iov = netmap_receive_iov,
     .poll = netmap_poll,
     .cleanup = netmap_cleanup,
-    .has_ufo = netmap_has_ufo,
+    .has_ufo = netmap_has_vnet_hdr,
     .has_vnet_hdr = netmap_has_vnet_hdr,
     .has_vnet_hdr_len = netmap_has_vnet_hdr_len,
     .using_vnet_hdr = netmap_using_vnet_hdr,
@@ -401,10 +418,10 @@ static NetClientInfo net_netmap_info = {
  *
  * ... -net netmap,ifname="..."
  */
-int net_init_netmap(const NetClientOptions *opts,
+int net_init_netmap(const Netdev *netdev,
                     const char *name, NetClientState *peer, Error **errp)
 {
-    const NetdevNetmapOptions *netmap_opts = opts->u.netmap;
+    const NetdevNetmapOptions *netmap_opts = &netdev->u.netmap;
     struct nm_desc *nmd;
     NetClientState *nc;
     Error *err = NULL;