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c1fcda2bdf
When device side MTU is larger than host side MTU, the packets (typically rmnet packets) are split over multiple MHI transfers. In that case, fragments must be re-aggregated to recover the packet before forwarding to upper layer. A fragmented packet result in -EOVERFLOW MHI transaction status for each of its fragments, except the final one. Such transfer was previously considered as error and fragments were simply dropped. This change adds re-aggregation mechanism using skb chaining, via skb frag_list. A warning (once) is printed since this behavior usually comes from a misconfiguration of the device (e.g. modem MTU). Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Acked-by: Jesse Brandeburg <jesse.brandeburg@intel.com> Link: https://lore.kernel.org/r/1612428002-12333-1-git-send-email-loic.poulain@linaro.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>