[PATCH 02/10] dp8393x: Clean up endianness hacks

[Finn Thain <fthain@telegraphics.com.au>]

The in_use field is no different to the other words handled using
dp8393x_put() and dp8393x_get(). Use the same technique for in_use
that is used everywhere else.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
---
Laurent tells me that this clean-up has been tried before. He referred
me to commit c744cf7879 ("dp8393x: fix dp8393x_receive()") and
commit 409b52bfe1 ("net/dp8393x: correctly reset in_use field").

Both of those patches look wrong to me because they both pass the wrong
byte count to address_space_rw(). It's possible that those patches were
needed to work around some kind of bug elsewhere, for example, an
off-by-one result from dp8393x_crda(). The preceding patch in this series
might help there.

This needs testing with the little endian MIPS Jazz emulation.
---
 hw/net/dp8393x.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c
index 164311c055..3fd59bc1d4 100644
--- a/hw/net/dp8393x.c
+++ b/hw/net/dp8393x.c
@@ -760,8 +760,6 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
         return -1;
     }
 
-    /* XXX: Check byte ordering */
-
     /* Check for EOL */
     if (s->regs[SONIC_LLFA] & 0x1) {
         /* Are we still in resource exhaustion? */
@@ -831,15 +829,12 @@ static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
         /* EOL detected */
         s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
     } else {
-        /* Clear in_use, but it is always 16bit wide */
+        /* Clear in_use */
         int offset = dp8393x_crda(s) + sizeof(uint16_t) * 6 * width;
-        if (s->big_endian && width == 2) {
-            /* we need to adjust the offset of the 16bit field */
-            offset += sizeof(uint16_t);
-        }
-        s->data[0] = 0;
+        size = sizeof(uint16_t) * width;
+        dp8393x_put(s, width, 0, 0);
         address_space_rw(&s->as, offset, MEMTXATTRS_UNSPECIFIED,
-                         (uint8_t *)s->data, sizeof(uint16_t), 1);
+                         (uint8_t *)s->data, size, 1);
         s->regs[SONIC_CRDA] = s->regs[SONIC_LLFA];
         s->regs[SONIC_ISR] |= SONIC_ISR_PKTRX;
         s->regs[SONIC_RSC] = (s->regs[SONIC_RSC] & 0xff00) | (((s->regs[SONIC_RSC] & 0x00ff) + 1) & 0x00ff);
-- 
2.23.0