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Move skb_frag_t adjustment into bpf_xdp_shrink_data() and extend its functionality to be able to shrink an xdp fragment from both head and tail. In a later patch, bpf_xdp_pull_data() will reuse it to shrink an xdp fragment from head. Additionally, in bpf_xdp_frags_shrink_tail(), breaking the loop when bpf_xdp_shrink_data() returns false (i.e., not releasing the current fragment) is not necessary as the loop condition, offset > 0, has the same effect. Remove the else branch to simplify the code. Signed-off-by: Amery Hung <ameryhung@gmail.com> Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Link: https://patch.msgid.link/20250922233356.3356453-3-ameryhung@gmail.com