Re: Regarding skb and skb_frags

On 05/01/2014 06:42 PM, Pranay Srivastava wrote:

I was going through a function

dev_alloc_skb

and it seems that the skb_frags are created only if the data length passed is > PAGE_SIZE.

My question is that an Ethernet frame won't be bigger than 1500 bytes [correct?] so there never will be skb_frags for Ethernet frames.

No, you should consider TSO and GSO things. Thanks

However I've seen skb_frags appeared when sending large data.

I'm not sure how to understand this. Does the driver pokes IP header to check how many fragments would be coming and decides (on the rcv side) how much to pass in dev_alloc_skb ?

Thanks