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


From: Thomas Huth
Subject: Re: [PATCH 08/21] hw/net/e1000: Remove unused E1000_FLAG_MAC flag
Date: Fri, 17 Jan 2025 09:58:14 +0100
User-agent: Mozilla Thunderbird

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,




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