Hello we've noticed that "candump -x" on normal CAN ISO-TP traffic shows: | (2021-02-18 14:52:51.643904) ca0 TX B E 713 [8] 20 0D 0E 0F AA AA AA AA Note here the "B" and "E" flags are set. Another possibility is to use skb_put_zero() instead of skb_put(), but with a bigger overhead. A 3. option is to only memset() the non-data part of the struct canfd_frame. regards, Marc
