hw/net: vmxnet3: Remove the logic of padding short frames in the rece…

…ive path

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

This actually reverts commit 40a87c6.

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

hw/net/vmxnet3.c

@@ -40,7 +40,6 @@
 
 #define PCI_DEVICE_ID_VMWARE_VMXNET3_REVISION 0x1
 #define VMXNET3_MSIX_BAR_SIZE 0x2000
-#define MIN_BUF_SIZE 60
 
 /* Compatibility flags for migration */
 #define VMXNET3_COMPAT_FLAG_OLD_MSI_OFFSETS_BIT 0
@@ -1977,7 +1976,6 @@ vmxnet3_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 {
     VMXNET3State *s = qemu_get_nic_opaque(nc);
     size_t bytes_indicated;
-    uint8_t min_buf[MIN_BUF_SIZE];
 
     if (!vmxnet3_can_receive(nc)) {
         VMW_PKPRN("Cannot receive now");
@@ -1990,14 +1988,6 @@ vmxnet3_receive(NetClientState *nc, const uint8_t *buf, size_t size)
         size -= sizeof(struct virtio_net_hdr);
     }
 
-    /* Pad to minimum Ethernet frame length */
-    if (size < sizeof(min_buf)) {
-        memcpy(min_buf, buf, size);
-        memset(&min_buf[size], 0, sizeof(min_buf) - size);
-        buf = min_buf;
-        size = sizeof(min_buf);
-    }
-
     net_rx_pkt_set_packet_type(s->rx_pkt,
         get_eth_packet_type(PKT_GET_ETH_HDR(buf)));