From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-182.mta0.migadu.com (out-182.mta0.migadu.com [91.218.175.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E5AD83624B2 for ; Tue, 14 Jul 2026 02:51:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783997480; cv=none; b=ahB3Oa6JxBK9hxTPYYisg9aHp0vEB/AU1lqxMTMOKt3wpQ5hvpC+8CpzNGLhe0b0DbxmIy3DiBVCD+aYbo9sjk0Z1baBx8F1DcL3P6HZwNBUoshB1qPiq4Oer0ihHtemRielGnbx4JXhxIdyn9tzbNJMkMIST69SYuEC27rl3IE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783997480; c=relaxed/simple; bh=IhJKUha7Vru/eebXQzvCgZziJBMxY6hk2b1f6wSTowI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=GlkO+hkLkNf7pB5EDZAjDA3qBzjC0UgQLYgzb3Qc+HadhkEVKhgdxViXt9KuZoTX5AtCinnEJ3MIL/11bmodmCpDNkt8paJuIiDZyyjYo3DKh19XZrghxptlu+1Gb8cJaLBCEN2nn8hN9FXsOrwrtMQwEFnfc285oEPGhnqYBaA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=QQz8sqWv; arc=none smtp.client-ip=91.218.175.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="QQz8sqWv" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1783997476; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=1rEnfawiH1rUI2ixdzp/X50M5aPlt9DKDjE68QCryO8=; b=QQz8sqWvGo25reDkdkR+CV3dThlr38KgDGv4EIeVdeRR+NcrRp0uQp2ijyp3lwrOHlmboF Er0wHUXKlhdYNutFT/9LwL7+7p1SLF0Vuc2QCOnN/Rgp9qFDIrNlxWIav18w1BUuBwdd2V ZRBrygMk6WTxmsXoUqYyWbacuVZEfHI= From: Chenguang Zhao To: anthony.l.nguyen@intel.com, przemyslaw.kitszel@intel.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, chenguang.zhao@linux.dev, Chenguang Zhao Subject: [PATCH net] i40e: xsk: fix multi-buffer XDP_PASS skb construction Date: Tue, 14 Jul 2026 10:51:12 +0800 Message-Id: <20260714025112.284724-1-chenguang.zhao@linux.dev> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT 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 --- - Fix memcpy source: use skb_frag_address() instead of skb_frag_page(), which was copying page metadata rather than packet data. - Fix frag attachment: pass the allocated struct page * to the skb frag helper instead of the page virtual address. - Use skb_add_rx_frag() so skb->len, data_len and truesize are updated when attaching copied frags. - On mid-loop dev_alloc_page() failure, go through the shared out path so previously attached pages are released via kfree_skb and xsk_buff_free() is still called. 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