Merge remote-tracking branch 'remotes/stefanha/tags/net-pull-request' into staging

# gpg: Signature made Fri 19 Dec 2014 13:18:18 GMT using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"

* remotes/stefanha/tags/net-pull-request:
  e1000: defer packets until BM enabled
  net: Use g_new() & friends where that makes obvious sense
  net: Fuse g_malloc(); memset() into g_new0()
  net: don't use set/get_pointer() in set/get_netdev()
  tap: fix vcpu long time io blocking on tap

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/core/qdev-properties-system.c

@@ -177,42 +177,69 @@ PropertyInfo qdev_prop_chr = {
 };
 
 /* --- netdev device --- */
+static void get_netdev(Object *obj, Visitor *v, void *opaque,
+                       const char *name, Error **errp)
+{
+    DeviceState *dev = DEVICE(obj);
+    Property *prop = opaque;
+    NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
+    char *p = g_strdup(peers_ptr->ncs[0] ? peers_ptr->ncs[0]->name : "");
 
-static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
+    visit_type_str(v, &p, name, errp);
+    g_free(p);
+}
+
+static void set_netdev(Object *obj, Visitor *v, void *opaque,
+                       const char *name, Error **errp)
 {
-    NICPeers *peers_ptr = (NICPeers *)ptr;
+    DeviceState *dev = DEVICE(obj);
+    Property *prop = opaque;
+    NICPeers *peers_ptr = qdev_get_prop_ptr(dev, prop);
     NetClientState **ncs = peers_ptr->ncs;
     NetClientState *peers[MAX_QUEUE_NUM];
-    int queues, i = 0;
-    int ret;
+    Error *local_err = NULL;
+    int queues, err = 0, i = 0;
+    char *str;
+
+    if (dev->realized) {
+        qdev_prop_set_after_realize(dev, name, errp);
+        return;
+    }
+
+    visit_type_str(v, &str, name, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
 
     queues = qemu_find_net_clients_except(str, peers,
                                           NET_CLIENT_OPTIONS_KIND_NIC,
                                           MAX_QUEUE_NUM);
     if (queues == 0) {
-        ret = -ENOENT;
-        goto err;
+        err = -ENOENT;
+        goto out;
     }
 
     if (queues > MAX_QUEUE_NUM) {
-        ret = -E2BIG;
-        goto err;
+        error_setg(errp, "queues of backend '%s'(%d) exceeds QEMU limitation(%d)",
+                   str, queues, MAX_QUEUE_NUM);
+        goto out;
     }
 
     for (i = 0; i < queues; i++) {
         if (peers[i] == NULL) {
-            ret = -ENOENT;
-            goto err;
+            err = -ENOENT;
+            goto out;
         }
 
         if (peers[i]->peer) {
-            ret = -EEXIST;
-            goto err;
+            err = -EEXIST;
+            goto out;
         }
 
         if (ncs[i]) {
-            ret = -EINVAL;
-            goto err;
+            err = -EINVAL;
+            goto out;
         }
 
         ncs[i] = peers[i];
@@ -221,30 +248,9 @@ static int parse_netdev(DeviceState *dev, const char *str, void **ptr)
 
     peers_ptr->queues = queues;
 
-    return 0;
-
-err:
-    return ret;
-}
-
-static char *print_netdev(void *ptr)
-{
-    NetClientState *netdev = ptr;
-    const char *val = netdev->name ? netdev->name : "";
-
-    return g_strdup(val);
-}
-
-static void get_netdev(Object *obj, Visitor *v, void *opaque,
-                       const char *name, Error **errp)
-{
-    get_pointer(obj, v, opaque, print_netdev, name, errp);
-}
-
-static void set_netdev(Object *obj, Visitor *v, void *opaque,
-                       const char *name, Error **errp)
-{
-    set_pointer(obj, v, opaque, parse_netdev, name, errp);
+out:
+    error_set_from_qdev_prop_error(errp, err, dev, prop, str);
+    g_free(str);
 }
 
 PropertyInfo qdev_prop_netdev = {

hw/net/e1000.c

@@ -33,6 +33,7 @@
 #include "sysemu/sysemu.h"
 #include "sysemu/dma.h"
 #include "qemu/iov.h"
+#include "qemu/range.h"
 
 #include "e1000_regs.h"
 
@@ -923,7 +924,9 @@ e1000_can_receive(NetClientState *nc)
     E1000State *s = qemu_get_nic_opaque(nc);
 
     return (s->mac_reg[STATUS] & E1000_STATUS_LU) &&
-        (s->mac_reg[RCTL] & E1000_RCTL_EN) && e1000_has_rxbufs(s, 1);
+        (s->mac_reg[RCTL] & E1000_RCTL_EN) &&
+        (s->parent_obj.config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
+        e1000_has_rxbufs(s, 1);
 }
 
 static uint64_t rx_desc_base(E1000State *s)
@@ -1529,6 +1532,20 @@ static NetClientInfo net_e1000_info = {
     .link_status_changed = e1000_set_link_status,
 };
 
+static void e1000_write_config(PCIDevice *pci_dev, uint32_t address,
+                                uint32_t val, int len)
+{
+    E1000State *s = E1000(pci_dev);
+
+    pci_default_write_config(pci_dev, address, val, len);
+
+    if (range_covers_byte(address, len, PCI_COMMAND) &&
+        (pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
+        qemu_flush_queued_packets(qemu_get_queue(s->nic));
+    }
+}
+
+
 static int pci_e1000_init(PCIDevice *pci_dev)
 {
     DeviceState *dev = DEVICE(pci_dev);
@@ -1539,6 +1556,8 @@ static int pci_e1000_init(PCIDevice *pci_dev)
     int i;
     uint8_t *macaddr;
 
+    pci_dev->config_write = e1000_write_config;
+
     pci_conf = pci_dev->config;
 
     /* TODO: RST# value should be 0, PCI spec 6.2.4 */

net/l2tpv3.c

@@ -489,12 +489,12 @@ static struct mmsghdr *build_l2tpv3_vector(NetL2TPV3State *s, int count)
     struct iovec *iov;
     struct mmsghdr *msgvec, *result;
 
-    msgvec = g_malloc(sizeof(struct mmsghdr) * count);
+    msgvec = g_new(struct mmsghdr, count);
     result = msgvec;
     for (i = 0; i < count ; i++) {
         msgvec->msg_hdr.msg_name = NULL;
         msgvec->msg_hdr.msg_namelen = 0;
-        iov =  g_malloc(sizeof(struct iovec) * IOVSIZE);
+        iov =  g_new(struct iovec, IOVSIZE);
         msgvec->msg_hdr.msg_iov = iov;
         iov->iov_base = g_malloc(s->header_size);
         iov->iov_len = s->header_size;
@@ -695,8 +695,7 @@ int net_init_l2tpv3(const NetClientOptions *opts,
         goto outerr;
     }
 
-    s->dgram_dst = g_malloc(sizeof(struct sockaddr_storage));
-    memset(s->dgram_dst, '\0' , sizeof(struct sockaddr_storage));
+    s->dgram_dst = g_new0(struct sockaddr_storage, 1);
     memcpy(s->dgram_dst, result->ai_addr, result->ai_addrlen);
     s->dst_size = result->ai_addrlen;
 
@@ -730,7 +729,7 @@ int net_init_l2tpv3(const NetClientOptions *opts,
     }
 
     s->msgvec = build_l2tpv3_vector(s, MAX_L2TPV3_MSGCNT);
-    s->vec = g_malloc(sizeof(struct iovec) * MAX_L2TPV3_IOVCNT);
+    s->vec = g_new(struct iovec, MAX_L2TPV3_IOVCNT);
     s->header_buf = g_malloc(s->header_size);
 
     qemu_set_nonblock(fd);

net/queue.c

@@ -62,7 +62,7 @@ NetQueue *qemu_new_net_queue(void *opaque)
 {
     NetQueue *queue;
 
-    queue = g_malloc0(sizeof(NetQueue));
+    queue = g_new0(NetQueue, 1);
 
     queue->opaque = opaque;
     queue->nq_maxlen = 10000;

net/slirp.c

@@ -652,7 +652,7 @@ static int slirp_guestfwd(SlirpState *s, const char *config_str,
             return -1;
         }
     } else {
-        fwd = g_malloc(sizeof(struct GuestFwd));
+        fwd = g_new(struct GuestFwd, 1);
         fwd->hd = qemu_chr_new(buf, p, NULL);
         if (!fwd->hd) {
             error_report("could not open guest forwarding device '%s'", buf);

net/tap.c

@@ -189,6 +189,7 @@ static void tap_send(void *opaque)
 {
     TAPState *s = opaque;
     int size;
+    int packets = 0;
 
     while (qemu_can_send_packet(&s->nc)) {
         uint8_t *buf = s->buf;
@@ -210,6 +211,17 @@ static void tap_send(void *opaque)
         } else if (size < 0) {
             break;
         }
+
+        /*
+         * When the host keeps receiving more packets while tap_send() is
+         * running we can hog the QEMU global mutex.  Limit the number of
+         * packets that are processed per tap_send() callback to prevent
+         * stalling the guest.
+         */
+        packets++;
+        if (packets >= 50) {
+            break;
+        }
     }
 }