hw/net: ne2000: Remove the logic of padding short frames in the recei…

…ve path

Now that we have implemented unified short frames padding in the
QEMU networking codes, remove the same logic in the NIC codes.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/ne2000.c

@@ -167,15 +167,12 @@ static int ne2000_buffer_full(NE2000State *s)
     return 0;
 }
 
-#define MIN_BUF_SIZE 60
-
 ssize_t ne2000_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
 {
     NE2000State *s = qemu_get_nic_opaque(nc);
     size_t size = size_;
     uint8_t *p;
     unsigned int total_len, next, avail, len, index, mcast_idx;
-    uint8_t buf1[60];
     static const uint8_t broadcast_macaddr[6] =
         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
@@ -213,15 +210,6 @@ ssize_t ne2000_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
         }
     }
 
-
-    /* if too small buffer, then expand it */
-    if (size < MIN_BUF_SIZE) {
-        memcpy(buf1, buf, size);
-        memset(buf1 + size, 0, MIN_BUF_SIZE - size);
-        buf = buf1;
-        size = MIN_BUF_SIZE;
-    }
-
     index = s->curpag << 8;
     if (index >= NE2000_PMEM_END) {
         index = s->start;