Hi! I'm trying to build a network device driver supporting a very large MTU (around 64K) on top of an infiniband connection, and I've hit a couple of issues I'd appreciate some feedback on:
1. On the send side, I've set NETIF_F_SG, but hardware does not support checksum offloading, and I see "dropping NETIF_F_SG since no checksum feature" warning, and I seem to be getting large packets all in one chunk. The reason I've set NETIF_F_SG, is because I'm concerned that under real life stress Linux won't be able to allocate 64K of continuous memory. Is this concern of mine valid? I saw in-tree drivers allocating at least 8K. What's the best way to enable S/G on send side? Is checksum offloading really required for S/G? 2. On the receive side, what's the best/right way to create an skb that is larger than PAGE_SIZE? Do I allocate with alloc_page and fill in nr_frags with skb_fill_page_desc? Some drivers seem to fill in frag_list - which is better? I see than even skb_put only works properly on linear skb. What are the helpers legal for fragmented skb? Suggestions would be appreciated. Thanks, -- MST - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
