[GitHub] [incubator-nuttx] patacongo commented on a change in pull request #1047: sim/tapdev: follow the tunnel MTU size

[GitBox <gi...@apache.org>]

patacongo commented on a change in pull request #1047:
URL: https://github.com/apache/incubator-nuttx/pull/1047#discussion_r425158448



##########
File path: net/netdev/netdev_register.c
##########
@@ -333,6 +335,18 @@ int netdev_register(FAR struct net_driver_s *dev, enum net_lltype_e lltype)
             return -EINVAL;
         }
 
+      /* Update the package length */
+
+      if (dev->d_llhdrlen == 0)
+        {
+          dev->d_llhdrlen = llhdrlen;
+        }
+
+      if (dev->d_pktsize == 0)
+        {
+          dev->d_pktsize = pktsize;
+        }
+

Review comment:
       This could break network drivers that do not initialilze dev->d_llhdrlen and d_pktsize to zero.  Did you verify that all network drivers do this?




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