[v2,2/2] dp8393x: fix dp8393x_receive()
diff mbox series

Message ID 20191106112341.23735-3-laurent@vivier.eu
State New
Headers show
Series
  • dp8393x: fix problems detected with Quadra 800 machine
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Commit Message

Laurent Vivier Nov. 6, 2019, 11:23 a.m. UTC
RXpkt.in_use is always 16 bit wide, but when the bus access mode is 32bit
and the endianness is big, we must access the second word and not the
first. This patch adjusts the offset according to the size and endianness.

This fixes DHCP for Q800 guest.

Fixes: be9208419865 ("dp8393x: manage big endian bus")
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Tested-by: Hervé Poussineau <hpoussin@reactos.org>
---

Notes:
    v2: adjust the offset, not the size

 hw/net/dp8393x.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

Patch
diff mbox series

diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c
index 85d3f3788e..3d991af163 100644
--- a/hw/net/dp8393x.c
+++ b/hw/net/dp8393x.c
@@ -831,9 +831,15 @@  static ssize_t dp8393x_receive(NetClientState *nc, const uint8_t * buf,
         /* EOL detected */
         s->regs[SONIC_ISR] |= SONIC_ISR_RDE;
     } else {
-        dp8393x_put(s, width, 0, 0); /* in_use */
-        address_space_rw(&s->as, dp8393x_crda(s) + sizeof(uint16_t) * 6 * width,
-            MEMTXATTRS_UNSPECIFIED, (uint8_t *)s->data, sizeof(uint16_t), 1);
+        /* Clear in_use, but it is always 16bit wide */
+        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;
+        address_space_rw(&s->as, offset, MEMTXATTRS_UNSPECIFIED,
+                         (uint8_t *)s->data, sizeof(uint16_t), 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);