Rather than accessing the registers within the mixed RAM/MMIO
region as indexed register, declare a per-port TX_LEN. This
will help to map the RAM as RAM (keeping MMIO as MMIO) in few
commits.

Previous s->regs[R_TX_LEN0] and s->regs[R_TX_LEN1] are now
unused. Not a concern, this array will soon disappear.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
---
 hw/net/xilinx_ethlite.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/net/xilinx_ethlite.c b/hw/net/xilinx_ethlite.c
index 36ac8097af..06da940303 100644
--- a/hw/net/xilinx_ethlite.c
+++ b/hw/net/xilinx_ethlite.c
@@ -63,6 +63,7 @@
 typedef struct XlnxXpsEthLitePort
 {
     struct {
+        uint32_t tx_len;
         uint32_t tx_gie;
 
         uint32_t rx_ctrl;
@@ -134,6 +135,9 @@ eth_read(void *opaque, hwaddr addr, unsigned int size)
 
         case R_TX_LEN0:
         case R_TX_LEN1:
+            r = s->port[port_index].reg.tx_len;
+            break;
+
         case R_TX_CTRL1:
         case R_TX_CTRL0:
             r = s->regs[addr];
@@ -171,7 +175,7 @@ eth_write(void *opaque, hwaddr addr,
             if ((value & (CTRL_P | CTRL_S)) == CTRL_S) {
                 qemu_send_packet(qemu_get_queue(s->nic),
                                  txbuf_ptr(s, port_index),
-                                 s->regs[base + R_TX_LEN0]);
+                                 s->port[port_index].reg.tx_len);
                 if (s->regs[base + R_TX_CTRL0] & CTRL_I)
                     eth_pulse_irq(s);
             } else if ((value & (CTRL_P | CTRL_S)) == (CTRL_P | CTRL_S)) {
@@ -196,7 +200,7 @@ eth_write(void *opaque, hwaddr addr,
 
         case R_TX_LEN0:
         case R_TX_LEN1:
-            s->regs[addr] = value;
+            s->port[port_index].reg.tx_len = value;
             break;
 
         case R_TX_GIE0:
-- 
2.45.2