From: Chenguang Zhao When AF_XDP ZC receives a multi-buffer frame and the XDP program returns XDP_PASS, i40e_construct_skb_zc() copies frags into a new skb. The copy used skb_frag_page() as the memcpy source (page metadata instead of packet data) and passed a virtual address to __skb_fill_page_desc_noacc(), which expects a struct page *. Use skb_frag_address() for the copy, attach frags with skb_add_rx_frag() so len/data_len/truesize are updated, and on dev_alloc_page() failure free the skb via the shared out path so xsk_buff_free() still runs and previously attached pages are released by kfree_skb. Fixes: 1c9ba9c14658 ("i40e: xsk: add RX multi-buffer support") Signed-off-by: Chenguang Zhao Reviewed-by: Aleksandr Loktionov Reviewed-by: Jason Xing --- v3: - To ensure backport compatibility for stable branches, this patch solely addresses bug fixes. The refactored version that replaces i40e_construct_skb_zc() with xdp_build_skb_from_zc() will be submitted to the -next tree. v2: - https://lore.kernel.org/all/20260717012416.168107-1-chenguang.zhao@linux.dev/ v1: - https://lore.kernel.org/all/20260714025112.284724-1-chenguang.zhao@linux.dev/ drivers/net/ethernet/intel/i40e/i40e_xsk.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c index 9f47388eaba5..a4247710c85b 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c @@ -318,22 +318,19 @@ static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring, goto out; for (int i = 0; i < nr_frags; i++) { - struct skb_shared_info *skinfo = skb_shinfo(skb); skb_frag_t *frag = &sinfo->frags[i]; + unsigned int frag_size = skb_frag_size(frag); struct page *page; - void *addr; page = dev_alloc_page(); if (!page) { dev_kfree_skb(skb); - return NULL; + skb = NULL; + goto out; } - addr = page_to_virt(page); - memcpy(addr, skb_frag_page(frag), skb_frag_size(frag)); - - __skb_fill_page_desc_noacc(skinfo, skinfo->nr_frags++, - addr, 0, skb_frag_size(frag)); + memcpy(page_to_virt(page), skb_frag_address(frag), frag_size); + skb_add_rx_frag(skb, i, page, 0, frag_size, PAGE_SIZE); } out: -- 2.25.1