net: renesas: rswitch: fix possible early skb release

When sending frame split into multiple descriptors, hardware processes
descriptors one by one, including writing back DT values. The first
descriptor could be already marked as completed when processing of
next descriptors for the same frame is still in progress.

Although only the last descriptor is configured to generate interrupt,
completion of the first descriptor could be noticed by the driver when
handling interrupt for the previous frame.

Currently, driver stores skb in the entry that corresponds to the first
descriptor. This results into skb could be unmapped and freed when
hardware did not complete the send yet. This opens a window for
corrupting the data being sent.

Fix this by saving skb in the entry that corresponds to the last
descriptor used to send the frame.

Fixes: d2c96b9d ("net: rswitch: Add jumbo frames handling for TX")
Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://patch.msgid.link/20241208095004.69468-2-nikita.yoush@cogentembedded.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>