Thanks for the replies, you led me to a new solution,
I now think build_skb() is not the right choice, my motivation for using it in the first place, that I thought it meant getting away with not copying memory. build_skb() is replaced by netdev_alloc_skb_ip_align() and memcpy() (derived from drivers/net/ethernet/realtek/r8169.c). Read errors are gone, even without syncing DMA. Is it a good idea to do it anyway, i.e. leave calls to dma_sync_single_* in? Also, without build_skb(), kmalloc memory can be used (frag_size > 0), memory is used more efficiently, at least half of a page times 64 previously wasted. New code here: https://bitbucket.org/Kasreyn/linux-next/src/92f5aeb3b58f8d8dffd9178b6b5ff46217156caa/drivers/net/ethernet/moxa/moxart_ether.c#cl-424 Thanks, Jonas -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
