[GitHub] [incubator-nuttx] anchao commented on a diff in pull request #7616: net/l2/l3/l4: add support of iob offload

[GitBox]

anchao commented on code in PR #7616:
URL: https://github.com/apache/incubator-nuttx/pull/7616#discussion_r1027239747


##########
arch/sim/src/sim/up_netdriver.c:
##########
@@ -107,6 +120,10 @@ static void netdriver_reply(struct net_driver_s *dev)
 
   if (dev->d_len > 0)
     {
+#ifdef SIM_NETDEV_IOB_OFFLOAD
+      dev->d_buf = (void *)ETHBUF;

Review Comment:
   I added a new definition: LLBUF(Link Layer Buffer):
   
   ```
   /* There are some helper pointers for accessing the contents of the Link 
layer
    * headers
    */
   
   #define LLBUF ((FAR void *)(dev->d_iob ? \
                  &dev->d_iob->io_data[CONFIG_NET_LL_GRUARDSIZE - \
                                       NET_LL_HDRLEN(dev)] : dev->d_buf))
   
   /* Ethernet headers */
   
   #define ETHBUF ((FAR struct eth_hdr_s *)LLBUF)
   ```
   



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