Re: [PATCH 08/21] hw/net/e1000: Remove unused E1000_FLAG_MAC flag

[Thomas Huth <thuth@redhat.com>]

On 16/01/2025 00.22, Philippe Mathieu-Daudé wrote:
> E1000_FLAG_MAC was only used by the hw_compat_2_4[] array,
> via the 'extra_mac_registers=off' property. We removed all
> machines using that array, lets remove all the code around
> E1000_FLAG_MAC.
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   hw/net/e1000.c | 63 +++++++++-----------------------------------------
>   1 file changed, 11 insertions(+), 52 deletions(-)
> 
> diff --git a/hw/net/e1000.c b/hw/net/e1000.c
> index 3d0b2277039..14d2133cd80 100644
> --- a/hw/net/e1000.c
> +++ b/hw/net/e1000.c
> @@ -127,10 +127,8 @@ struct E1000State_st {
>       QEMUTimer *flush_queue_timer;
>   
>   /* Compatibility flags for migration to/from qemu 1.3.0 and older */
> -#define E1000_FLAG_MAC_BIT 2
>   #define E1000_FLAG_TSO_BIT 3
>   #define E1000_FLAG_VET_BIT 4
> -#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)
>   
> @@ -1218,46 +1216,17 @@ enum { MAC_ACCESS_PARTIAL = 1, MAC_ACCESS_FLAG_NEEDED = 2 };
>    * n - flag needed
>    * p - partially implenented */
>   static const uint8_t mac_reg_access[0x8000] = {
> -    [IPAV]    = markflag(MAC),    [WUC]     = markflag(MAC),
> -    [IP6AT]   = markflag(MAC),    [IP4AT]   = markflag(MAC),
> -    [FFVT]    = markflag(MAC),    [WUPM]    = markflag(MAC),
> -    [ECOL]    = markflag(MAC),    [MCC]     = markflag(MAC),
> -    [DC]      = markflag(MAC),    [TNCRS]   = markflag(MAC),
> -    [RLEC]    = markflag(MAC),    [XONRXC]  = markflag(MAC),
> -    [XOFFTXC] = markflag(MAC),    [RFC]     = markflag(MAC),
> -    [TSCTFC]  = markflag(MAC),    [MGTPRC]  = markflag(MAC),
> -    [WUS]     = markflag(MAC),    [AIT]     = markflag(MAC),
> -    [FFLT]    = markflag(MAC),    [FFMT]    = markflag(MAC),
> -    [SCC]     = markflag(MAC),    [FCRUC]   = markflag(MAC),
> -    [LATECOL] = markflag(MAC),    [COLC]    = markflag(MAC),
> -    [SEQEC]   = markflag(MAC),    [CEXTERR] = markflag(MAC),
> -    [XONTXC]  = markflag(MAC),    [XOFFRXC] = markflag(MAC),
> -    [RJC]     = markflag(MAC),    [RNBC]    = markflag(MAC),
> -    [MGTPDC]  = markflag(MAC),    [MGTPTC]  = markflag(MAC),
> -    [RUC]     = markflag(MAC),    [ROC]     = markflag(MAC),
> -    [GORCL]   = markflag(MAC),    [GORCH]   = markflag(MAC),
> -    [GOTCL]   = markflag(MAC),    [GOTCH]   = markflag(MAC),
> -    [BPRC]    = markflag(MAC),    [MPRC]    = markflag(MAC),
> -    [TSCTC]   = markflag(MAC),    [PRC64]   = markflag(MAC),
> -    [PRC127]  = markflag(MAC),    [PRC255]  = markflag(MAC),
> -    [PRC511]  = markflag(MAC),    [PRC1023] = markflag(MAC),
> -    [PRC1522] = markflag(MAC),    [PTC64]   = markflag(MAC),
> -    [PTC127]  = markflag(MAC),    [PTC255]  = markflag(MAC),
> -    [PTC511]  = markflag(MAC),    [PTC1023] = markflag(MAC),
> -    [PTC1522] = markflag(MAC),    [MPTC]    = markflag(MAC),
> -    [BPTC]    = markflag(MAC),

I think this is wrong. All those registers should still be marked with 
MAC_ACCESS_FLAG_NEEDED, shouldn't they?

  Thomas


> -    [TDFH]  = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [TDFT]  = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [TDFHS] = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [TDFTS] = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [TDFPC] = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [RDFH]  = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [RDFT]  = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [RDFHS] = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [RDFTS] = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [RDFPC] = markflag(MAC) | MAC_ACCESS_PARTIAL,
> -    [PBM]   = markflag(MAC) | MAC_ACCESS_PARTIAL,
> +    [TDFH]  = MAC_ACCESS_PARTIAL,
> +    [TDFT]  = MAC_ACCESS_PARTIAL,
> +    [TDFHS] = MAC_ACCESS_PARTIAL,
> +    [TDFTS] = MAC_ACCESS_PARTIAL,
> +    [TDFPC] = MAC_ACCESS_PARTIAL,
> +    [RDFH]  = MAC_ACCESS_PARTIAL,
> +    [RDFT]  = MAC_ACCESS_PARTIAL,
> +    [RDFHS] = MAC_ACCESS_PARTIAL,
> +    [RDFTS] = MAC_ACCESS_PARTIAL,
> +    [RDFPC] = MAC_ACCESS_PARTIAL,
> +    [PBM]   = MAC_ACCESS_PARTIAL,
>   };
>   
>   static void
> @@ -1419,13 +1388,6 @@ static int e1000_tx_tso_post_load(void *opaque, int version_id)
>       return 0;
>   }
>   
> -static bool e1000_full_mac_needed(void *opaque)
> -{
> -    E1000State *s = opaque;
> -
> -    return chkflag(MAC);
> -}
> -
>   static bool e1000_tso_state_needed(void *opaque)
>   {
>       E1000State *s = opaque;
> @@ -1451,7 +1413,6 @@ static const VMStateDescription vmstate_e1000_full_mac_state = {
>       .name = "e1000/full_mac_state",
>       .version_id = 1,
>       .minimum_version_id = 1,
> -    .needed = e1000_full_mac_needed,
>       .fields = (const VMStateField[]) {
>           VMSTATE_UINT32_ARRAY(mac_reg, E1000State, 0x8000),
>           VMSTATE_END_OF_LIST()
> @@ -1679,8 +1640,6 @@ static void pci_e1000_realize(PCIDevice *pci_dev, Error **errp)
>   
>   static const Property e1000_properties[] = {
>       DEFINE_NIC_PROPERTIES(E1000State, conf),
> -    DEFINE_PROP_BIT("extra_mac_registers", E1000State,
> -                    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,