[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_r1027227212


##########
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:
   Yes, ETHBUF will be cast to (struct eth_hdr_s), and the type of d_buf is 
(uint8_t *)
   
   ```
   FAR uint8_t *d_buf;
   
   
   #define ETHBUF ((FAR struct eth_hdr_s *) \
                   (dev->d_iob ? \
                    &dev->d_iob->io_data[CONFIG_NET_LL_GRUARDSIZE - 
NET_LL_HDRLEN(dev)] : \
                    dev->d_buf))
   
   ```
   
   



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