bitkeeper revision 1.226 (3ec0df46i6UtPbpFHgTTjTc0tGIKIA)

network.c, kernel.c:
  Changes to dynamic MAC address calculation -- now based on domain name rather than domain id.

xen/common/kernel.c

@@ -41,22 +41,20 @@ unsigned int opt_dom0_mem = 16000; /* default kbytes for DOM0 */
 unsigned int opt_ne_base = 0; /* NE2k NICs cannot be probed */
 unsigned char opt_ifname[10] = "eth0";
 int opt_noht=0, opt_noacpi=0, opt_nosmp=0;
-int opt_phys_bootmac=0; /* Is DOM0/VIF0 allocated the physical MAC address? */
 enum { OPT_IP, OPT_STR, OPT_UINT, OPT_BOOL };
 static struct {
     unsigned char *name;
     int type;
     void *var;
 } opts[] = {
-    { "console",      OPT_UINT, &opt_console },
-    { "ser_baud",     OPT_UINT, &opt_ser_baud },
-    { "dom0_mem",     OPT_UINT, &opt_dom0_mem }, 
-    { "ne_base",      OPT_UINT, &opt_ne_base },
-    { "ifname",       OPT_STR,  &opt_ifname },
-    { "noht",         OPT_BOOL, &opt_noht },
-    { "noacpi",       OPT_BOOL, &opt_noacpi },
-    { "nosmp",        OPT_BOOL, &opt_nosmp },
-    { "phys_bootmac", OPT_BOOL, &opt_phys_bootmac },
+    { "console",     OPT_UINT, &opt_console },
+    { "ser_baud",    OPT_UINT, &opt_ser_baud },
+    { "dom0_mem",    OPT_UINT, &opt_dom0_mem }, 
+    { "ne_base",     OPT_UINT, &opt_ne_base },
+    { "ifname",      OPT_STR,  &opt_ifname },
+    { "noht",        OPT_BOOL, &opt_noht },
+    { "noacpi",      OPT_BOOL, &opt_noacpi },
+    { "nosmp",       OPT_BOOL, &opt_nosmp },
     { NULL,       0,        NULL     }
 };
 

xen/common/network.c

@@ -70,8 +70,7 @@ net_vif_t *create_net_vif(int domain)
     net_ring_t *new_ring = NULL;
     struct task_struct *p = NULL;
     unsigned long flags, vmac_hash;
-    unsigned char vmac_key[ETH_ALEN + 4 + 2];
-    extern int opt_phys_bootmac;
+    unsigned char vmac_key[ETH_ALEN + 2 + MAX_DOMAIN_NAME];
 
     if ( !(p = find_domain_by_id(domain)) )
         return NULL;
@@ -106,12 +105,12 @@ net_vif_t *create_net_vif(int domain)
     spin_lock_init(&new_vif->rx_lock);
     spin_lock_init(&new_vif->tx_lock);
 
-    if ( opt_phys_bootmac && (p->domain == 0) && (dom_vif_idx == 0) )
+    if ( (p->domain == 0) && (dom_vif_idx == 0) )
     {
         /*
-         * DOM0/VIF0 may get the real physical MAC address, so that
-         * users can easily get a Xenoserver up and running by using an
-         * existing DHCP entry.
+         * DOM0/VIF0 gets the real physical MAC address, so that users can 
+         * easily get a Xenoserver up and running by using an existing DHCP 
+         * entry.
          */
         memcpy(new_vif->vmac, the_dev->dev_addr, ETH_ALEN);
     }
@@ -120,9 +119,8 @@ net_vif_t *create_net_vif(int domain)
         /*
          * Most VIFs get a random MAC address with a "special" vendor id.
          * We try to get MAC addresses to be unique across multiple servers
-         * by including the physical MAC address in the hash.
-         * However, the same machine with the same dom_id and vif_id should
-         * always get the same virtual MAC address.
+         * by including the physical MAC address in the hash. The hash also
+         * includes the vif index and the domain's name.
          * 
          * NB. The vendor is currently an "obsolete" one that used to belong
          * to DEC (AA-00-00). Using it is probably a bit rude :-)
@@ -132,9 +130,9 @@ net_vif_t *create_net_vif(int domain)
          * MAC addresses for some VIFs with no fear of clashes.
          */
         memcpy(&vmac_key[0], the_dev->dev_addr, ETH_ALEN);
-        *(__u32 *)(&vmac_key[ETH_ALEN+0]) = htonl(p->domain);
-        *(__u16 *)(&vmac_key[ETH_ALEN+4]) = htons(dom_vif_idx);
-        vmac_hash = hash(vmac_key, ETH_ALEN+4+2);
+        *(__u16 *)(&vmac_key[ETH_ALEN]) = htons(dom_vif_idx);
+        strcpy(&vmac_key[ETH_ALEN+2], p->name);
+        vmac_hash = hash(vmac_key, ETH_ALEN + 2 + strlen(p->name));
         memcpy(new_vif->vmac, "\xaa\x00\x00", 3);
         new_vif->vmac[3] = (vmac_hash >> 16) & 0xef; /* First bit is zero. */
         new_vif->vmac[4] = (vmac_hash >>  8) & 0xff;