From a1d7e475beb5c9e7a8e1213f29b0d20a208a9ade Mon Sep 17 00:00:00 2001 From: Christina Wang Date: Fri, 23 Jul 2021 15:55:10 +0800 Subject: hw/net: e1000: Correct the initial value of VET register The initial value of VLAN Ether Type (VET) register is 0x8100, as per the manual and real hardware. While Linux e1000 driver always writes VET register to 0x8100, it is not always the case for everyone. Drivers relying on the reset value of VET won't be able to transmit and receive VLAN frames in QEMU. Reported-by: Markus Carlstedt Signed-off-by: Christina Wang Signed-off-by: Bin Meng Signed-off-by: Jason Wang --- hw/net/e1000.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'hw/net') diff --git a/hw/net/e1000.c b/hw/net/e1000.c index 4f75b44cfc..a30546c5d5 100644 --- a/hw/net/e1000.c +++ b/hw/net/e1000.c @@ -29,6 +29,7 @@ #include "hw/pci/pci.h" #include "hw/qdev-properties.h" #include "migration/vmstate.h" +#include "net/eth.h" #include "net/net.h" #include "net/checksum.h" #include "sysemu/sysemu.h" @@ -130,10 +131,13 @@ struct E1000State_st { #define E1000_FLAG_MIT_BIT 1 #define E1000_FLAG_MAC_BIT 2 #define E1000_FLAG_TSO_BIT 3 +#define E1000_FLAG_VET_BIT 4 #define E1000_FLAG_AUTONEG (1 << E1000_FLAG_AUTONEG_BIT) #define E1000_FLAG_MIT (1 << E1000_FLAG_MIT_BIT) #define E1000_FLAG_MAC (1 << E1000_FLAG_MAC_BIT) #define E1000_FLAG_TSO (1 << E1000_FLAG_TSO_BIT) +#define E1000_FLAG_VET (1 << E1000_FLAG_VET_BIT) + uint32_t compat_flags; bool received_tx_tso; bool use_tso_for_migration; @@ -361,6 +365,13 @@ e1000_autoneg_timer(void *opaque) } } +static bool e1000_vet_init_need(void *opaque) +{ + E1000State *s = opaque; + + return chkflag(VET); +} + static void e1000_reset(void *opaque) { E1000State *d = opaque; @@ -386,6 +397,10 @@ static void e1000_reset(void *opaque) } e1000x_reset_mac_addr(d->nic, d->mac_reg, macaddr); + + if (e1000_vet_init_need(d)) { + d->mac_reg[VET] = ETH_P_VLAN; + } } static void @@ -1737,6 +1752,8 @@ static Property e1000_properties[] = { compat_flags, E1000_FLAG_MAC_BIT, true), DEFINE_PROP_BIT("migrate_tso_props", E1000State, compat_flags, E1000_FLAG_TSO_BIT, true), + DEFINE_PROP_BIT("init-vet", E1000State, + compat_flags, E1000_FLAG_VET_BIT, true), DEFINE_PROP_END_OF_LIST(), }; -- cgit v1.2.3