Re: [Qemu-devel] null mac address

[Wen Congyang <wency@cn.fujitsu.com>]

At 02/24/2011 10:40 PM, William Dauchy Write:
> Hi,
> 
> I got some troubles hot plugging network pci devices. An attach works
> as expected but the mac address is still set to "00:00:00:00:00:00" on
> the guest machine. I have to reboot the guest to get the correct mac
> address.
> I first tried through libvirt with:
> # virsh attach-interface dom0 network default --mac 52:54:00:f6:84:ba
> 
> and then through qemu monitor to make sure that it wasn't a libvirt issue:
> device_add rtl8139
> or
> device_add rtl8139,mac=01:02:03:04:05:06
> 
> Always the same result on the guest. A device info on qemu give the
> correct result, that is to say, with a correct mac address.
> I went through rtl8139.c and saw that the mac address is set in `rtl8139_reset`.
> This function was called in `pci_rtl8139_init` but removed since
> c169998802505c244b8bcad562633f29de7d74a4 commit, because it doesn't
> make sense to call it when the virtual machine is shutdown.
> I'm now wondering where I am supposed to call this reset function when
> live attaching a pci device. I think it could fix the mac address
> issue.
> I will be very pleased to receive some tips to create a patch for this issue.

Please try the following patch.

Thanks
Wen Congyang

>From efa0632f563a69dc299daaf4b235c1a0521d6e02 Mon Sep 17 00:00:00 2001
From: Wen Congyang <wency@cn.fujitsu.com>
Date: Fri, 25 Feb 2011 09:56:27 +0800
Subject: [PATCH] move eeprom init from reset function to init function

---
 hw/pcnet-pci.c |   12 ++++++++++++
 hw/pcnet.c     |   13 -------------
 hw/rtl8139.c   |   24 ++++++++++++------------
 3 files changed, 24 insertions(+), 25 deletions(-)

diff --git a/hw/pcnet-pci.c b/hw/pcnet-pci.c
index 339a401..d7c4fc3 100644
--- a/hw/pcnet-pci.c
+++ b/hw/pcnet-pci.c
@@ -270,6 +270,8 @@ static int pci_pcnet_init(PCIDevice *pci_dev)
     PCIPCNetState *d = DO_UPCAST(PCIPCNetState, pci_dev, pci_dev);
     PCNetState *s = &d->state;
     uint8_t *pci_conf;
+    int i;
+    uint16_t checksum;
 
 #if 0
     printf("sizeof(RMD)=%d, sizeof(TMD)=%d\n",
@@ -292,6 +294,16 @@ static int pci_pcnet_init(PCIDevice *pci_dev)
     pci_conf[PCI_MIN_GNT] = 0x06;
     pci_conf[PCI_MAX_LAT] = 0xff;
 
+    /* Initialize the PROM */
+
+    memcpy(s->prom, s->conf.macaddr.a, 6);
+    s->prom[12] = s->prom[13] = 0x00;
+    s->prom[14] = s->prom[15] = 0x57;
+
+    for (i = 0,checksum = 0; i < 16; i++)
+        checksum += s->prom[i];
+    *(uint16_t *)&s->prom[12] = cpu_to_le16(checksum);
+
     /* Handler for memory-mapped I/O */
     s->mmio_index =
       cpu_register_io_memory(pcnet_mmio_read, pcnet_mmio_write, &d->state,
diff --git a/hw/pcnet.c b/hw/pcnet.c
index db52dc5..283828a 100644
--- a/hw/pcnet.c
+++ b/hw/pcnet.c
@@ -1557,19 +1557,6 @@ uint32_t pcnet_bcr_readw(PCNetState *s, uint32_t rap)
 void pcnet_h_reset(void *opaque)
 {
     PCNetState *s = opaque;
-    int i;
-    uint16_t checksum;
-
-    /* Initialize the PROM */
-
-    memcpy(s->prom, s->conf.macaddr.a, 6);
-    s->prom[12] = s->prom[13] = 0x00;
-    s->prom[14] = s->prom[15] = 0x57;
-
-    for (i = 0,checksum = 0; i < 16; i++)
-        checksum += s->prom[i];
-    *(uint16_t *)&s->prom[12] = cpu_to_le16(checksum);
-
 
     s->bcr[BCR_MSRDA] = 0x0005;
     s->bcr[BCR_MSWRA] = 0x0005;
diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index a22530c..580c83e 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -1189,18 +1189,6 @@ static void rtl8139_reset(DeviceState *d)
 
     rtl8139_update_irq(s);
 
-    /* prepare eeprom */
-    s->eeprom.contents[0] = 0x8129;
-#if 1
-    // PCI vendor and device ID should be mirrored here
-    s->eeprom.contents[1] = PCI_VENDOR_ID_REALTEK;
-    s->eeprom.contents[2] = PCI_DEVICE_ID_REALTEK_8139;
-#endif
-
-    s->eeprom.contents[7] = s->conf.macaddr.a[0] | s->conf.macaddr.a[1] << 8;
-    s->eeprom.contents[8] = s->conf.macaddr.a[2] | s->conf.macaddr.a[3] << 8;
-    s->eeprom.contents[9] = s->conf.macaddr.a[4] | s->conf.macaddr.a[5] << 8;
-
     /* mark all status registers as owned by host */
     for (i = 0; i < 4; ++i)
     {
@@ -3392,6 +3380,18 @@ static int pci_rtl8139_init(PCIDevice *dev)
 
     qemu_macaddr_default_if_unset(&s->conf.macaddr);
 
+    /* prepare eeprom */
+    s->eeprom.contents[0] = 0x8129;
+#if 1
+    // PCI vendor and device ID should be mirrored here
+    s->eeprom.contents[1] = PCI_VENDOR_ID_REALTEK;
+    s->eeprom.contents[2] = PCI_DEVICE_ID_REALTEK_8139;
+#endif
+
+    s->eeprom.contents[7] = s->conf.macaddr.a[0] | s->conf.macaddr.a[1] << 8;
+    s->eeprom.contents[8] = s->conf.macaddr.a[2] | s->conf.macaddr.a[3] << 8;
+    s->eeprom.contents[9] = s->conf.macaddr.a[4] | s->conf.macaddr.a[5] << 8;
+
     s->nic = qemu_new_nic(&net_rtl8139_info, &s->conf,
                           dev->qdev.info->name, dev->qdev.id, s);
     qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);
-- 
1.7.1


> 
> Regards,