hw/net/xilinx_ethlite: Correct maximum RX buffer size

The current max RX bufsize is set to 0x800. This is
invalid, since it contains the MMIO registers region.
Add the correct definition (valid for both TX & RX,
see datasheet p. 20, Table 11 "XPS Ethernet Lite MAC
Memory Map") and use it.

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20241112181044.92193-6-philmd@linaro.org>

diff --git a/hw/net/xilinx_ethlite.c b/hw/net/xilinx_ethlite.c
index 330dccb83df68bd83d0bb8e9bd9c783ef1e722c5..d54f96df243c8ef3174e4eef2034b0f27577a61c 100644 (file)
--- a/hw/net/xilinx_ethlite.c
+++ b/hw/net/xilinx_ethlite.c
@@ -3,6 +3,9 @@
  *
  * Copyright (c) 2009 Edgar E. Iglesias.
  *
+ * DS580: https://docs.amd.com/v/u/en-US/xps_ethernetlite
+ * LogiCORE IP XPS Ethernet Lite Media Access Controller
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
@@ -33,6 +36,7 @@
 #include "trace.h"
 
 #define R_TX_BUF0     0
+#define BUFSZ_MAX      0x07e4
 #define R_TX_LEN0     (0x07f4 / 4)
 #define R_TX_GIE0     (0x07f8 / 4)
 #define R_TX_CTRL0    (0x07fc / 4)
@@ -191,7 +195,7 @@ static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size)
         return -1;
     }
 
-    if (size > (R_MAX - R_RX_BUF0 - rxbase) * 4) {
+    if (size >= BUFSZ_MAX) {
         trace_ethlite_pkt_size_too_big(size);
         return -1;
     }