Some guest operating systems' drivers (Mac OS X in particular) fail to properly initialize the Receive Address registers (probably expecting them to be pre-initialized by an earlier component, such as a specific proprietary BIOS). This patch pre-initializes the RA registers, allowing OS X networking to function properly. Other guest operating systems are not affected, and free to (re)initialize these registers during boot.
Signed-off-by: Gabriel Somlo <[email protected]> --- On Wed, Oct 31, 2012 at 09:03:51AM +0100, Stefan Hajnoczi wrote: > Please use 4 space indentation (QEMU coding style). My bad, fixed in this version. > > + memmove(&d->mac_reg[RA], &d->conf.macaddr, sizeof(struct MACAddr)); > > When the host is big-endian the filter code will byteswap and the MAC address > will not match: > > for (rp = s->mac_reg + RA; rp < s->mac_reg + RA + 32; rp += 2) { > if (!(rp[1] & E1000_RAH_AV)) > continue; > ra[0] = cpu_to_le32(rp[0]); > ra[1] = cpu_to_le32(rp[1]); > if (!memcmp(buf, (uint8_t *)ra, 6)) { OK, I guess I could just memmove from d->eeprom_data instead of d->conf.macaddr.a, on the assumption that pci_e1000_init() already did the endian-proofing for me. But probably the safest/most paranoid method is best, see below... Thanks, Gabriel hw/e1000.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/hw/e1000.c b/hw/e1000.c index e4f1ffe..a29b844 100644 --- a/hw/e1000.c +++ b/hw/e1000.c @@ -266,6 +266,8 @@ rxbufsize(uint32_t v) static void e1000_reset(void *opaque) { E1000State *d = opaque; + uint8_t *macaddr = d->conf.macaddr.a; + int i; qemu_del_timer(d->autoneg_timer); memset(d->phy_reg, 0, sizeof d->phy_reg); @@ -278,6 +280,14 @@ static void e1000_reset(void *opaque) if (d->nic->nc.link_down) { e1000_link_down(d); } + + /* Some guests expect pre-initialized RAH/RAL (AddrValid flag + MACaddr) */ + d->mac_reg[RA] = 0; + d->mac_reg[RA+1] = E1000_RAH_AV; + for (i = 0; i < 4; i++) { + d->mac_reg[RA] |= macaddr[i]<<(8*i); + d->mac_reg[RA+1] |= (i < 2) ? macaddr[i+4]<<(8*i) : 0; + } } static void -- 1.7.7.6
