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9f4960b94f
chan.hdrlen is read once at channel registration by ppp_register_net_channel(), and used to set the PPP net device's hard_header_len. It was set to PPPOL2TP_L2TP_HDR_SIZE_NOSEQ (6), which is 4 bytes too small if sequence numbers are later enabled via setsockopt(PPPOL2TP_SO_SENDSEQ), causing unnecessary skb reallocations on the TX path. The setsockopt handler attempted to change netdev's hard_header_len by updating chan.hdrlen, but the PPP layer never re-reads it after the registration, so the update had no effect. To avoid the unnecessary reallocations, set chan.hdrlen to PPPOL2TP_L2TP_HDR_SIZE_SEQ (10) unconditionally at registration and remove the ineffective update in the setsockopt callback. Signed-off-by: Qingfang Deng <dqfext@gmail.com> Link: https://patch.msgid.link/20260317054141.524879-1-dqfext@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>