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

["Daniel P. Berrangé" <berrange@redhat.com>]

On Thu, Jan 16, 2025 at 12:22:34AM +0100, 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(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

> 
> 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),
> -
> -    [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,

It seems like this is removing all use of the 'markflag' macro ?

If I'm correct, then that macro can be removed. That in turnm means
the 'MAC_ACCESS_FLAG_NEEDED' enum entry can also be removed, as well
as places in code that check this flag.

>  };
>  
>  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,
> -- 
> 2.47.1
> 
> 

With regards,
Daniel
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