From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-176.mta1.migadu.com (out-176.mta1.migadu.com [95.215.58.176]) (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 B8D7A1C84A0 for ; Wed, 29 Jul 2026 05:50:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785304238; cv=none; b=fgB0SirBcMjIglv5gbAIhPX7xy4GkG1Mx1axD+1UlL7RkQemNf9yXVUoavU9Zj1K4KZQcHsYqM5Zli/ClIpQxeMp/W8o5l0uebP6svSA+2qp0E/QKFYi9XjHKZOxuS8jtj48k/Lc7n4t9TBuVcai7jyg+jz6U3SixQwLcCtOJn0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785304238; c=relaxed/simple; bh=C7HJEtIxx6ObS3jlAgLuXW6J/tMd5vqxMb4ADjenThA=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=KE4hKB2SlTIzTmyCBFJe+H9CTDcj4g3SgXTkaGREgBu8cpwA58dfYEra3uPnG/UB+vkAJJ2JOv9vB7z97Ka5Vm5LOdJRq4mPKqmS/A0ij7puY2rJ6qO5uX5iS//lsxbcPGgdlyqs3h8gs5M6PtHq0dCdFiF/kLtMl5LzQfQrKZk= 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=RIfHixTp; arc=none smtp.client-ip=95.215.58.176 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="RIfHixTp" 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=1785304233; 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=0bZ169YdbqXKNleo9UtpL+ygZkIM/xnq5Ot5tib0OmI=; b=RIfHixTpVWQn/Rq6tIx31VvRQXojsHnwHU3Z113+j83zuqBLMvxLjnISJurZXgImARBZyD 4FUNqnDsmajM/OLAhC2gD1Cg5zNC2FeFNaO/eKohM+04BjGxPw1p8KpjFheXlb9lxInad/ TAErrd6yn7c6AKl1Av5iDNAneZKMwoc= 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, kerneljasonxing@gmail.com, Chenguang Zhao Subject: [PATCH net-next v2] i40e: xsk: use xdp_build_skb_from_zc() for XDP_PASS Date: Wed, 29 Jul 2026 13:49:16 +0800 Message-Id: <20260729054916.720750-1-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 Replace the driver-local i40e_construct_skb_zc() with the common helper xdp_build_skb_from_zc(). On failure, free the xdp buff in the caller. xdp_build_skb_from_zc() already calls skb_record_rx_queue() and eth_type_trans(), so pull the remaining descriptor field setup into __i40e_process_skb_fields() and use that on the XDP_PASS path. Briefly restore the Ethernet header around eth_skb_pad() so padding sees the full L2 frame length. Signed-off-by: Chenguang Zhao --- v2: - Extract descriptor field setup into __i40e_process_skb_fields() and use it on the XDP_PASS path, so skb_record_rx_queue()/eth_type_trans() are not repeated after xdp_build_skb_from_zc(). - Keep a brief __skb_push()/__skb_pull() around eth_skb_pad() so padding still sees the full L2 frame length. v1: - https://lore.kernel.org/all/20260724020125.246333-1-chenguang.zhao@linux.dev/ --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 32 ++++++-- .../ethernet/intel/i40e/i40e_txrx_common.h | 2 + drivers/net/ethernet/intel/i40e/i40e_xsk.c | 76 +++---------------- 3 files changed, 36 insertions(+), 74 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index ef5e657816f0..87553b14d34a 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -1833,17 +1833,17 @@ static inline void i40e_rx_hash(struct i40e_ring *ring, } /** - * i40e_process_skb_fields - Populate skb header fields from Rx descriptor + * __i40e_process_skb_fields - Populate skb fields from Rx descriptor * @rx_ring: rx descriptor ring packet is being transacted on * @rx_desc: pointer to the EOP Rx descriptor * @skb: pointer to current skb being populated * - * This function checks the ring, descriptor, and packet information in - * order to populate the hash, checksum, VLAN, protocol, and - * other fields within the skb. + * Populate hash, checksum, PTP timestamp and VLAN from @rx_desc. Does not + * call skb_record_rx_queue() or eth_type_trans(); callers that already got + * those from xdp_build_skb_from_zc() should use this helper. **/ -void i40e_process_skb_fields(struct i40e_ring *rx_ring, - union i40e_rx_desc *rx_desc, struct sk_buff *skb) +void __i40e_process_skb_fields(struct i40e_ring *rx_ring, + union i40e_rx_desc *rx_desc, struct sk_buff *skb) { u64 qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); u32 rx_status = FIELD_GET(I40E_RXD_QW1_STATUS_MASK, qword); @@ -1858,14 +1858,30 @@ void i40e_process_skb_fields(struct i40e_ring *rx_ring, i40e_rx_checksum(rx_ring->vsi, skb, rx_desc); - skb_record_rx_queue(skb, rx_ring->queue_index); - if (qword & BIT(I40E_RX_DESC_STATUS_L2TAG1P_SHIFT)) { __le16 vlan_tag = rx_desc->wb.qword0.lo_dword.l2tag1; __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), le16_to_cpu(vlan_tag)); } +} + +/** + * i40e_process_skb_fields - Populate skb header fields from Rx descriptor + * @rx_ring: rx descriptor ring packet is being transacted on + * @rx_desc: pointer to the EOP Rx descriptor + * @skb: pointer to current skb being populated + * + * This function checks the ring, descriptor, and packet information in + * order to populate the hash, checksum, VLAN, protocol, and + * other fields within the skb. + **/ +void i40e_process_skb_fields(struct i40e_ring *rx_ring, + union i40e_rx_desc *rx_desc, struct sk_buff *skb) +{ + __i40e_process_skb_fields(rx_ring, rx_desc, skb); + + skb_record_rx_queue(skb, rx_ring->queue_index); /* modifies the skb - consumes the enet header */ skb->protocol = eth_type_trans(skb, rx_ring->netdev); diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h b/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h index e26807fd2123..3c52e0e60487 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx_common.h @@ -9,6 +9,8 @@ int i40e_xmit_xdp_tx_ring(struct xdp_buff *xdp, struct i40e_ring *xdp_ring); void i40e_clean_programming_status(struct i40e_ring *rx_ring, u64 qword0_raw, u64 qword1); +void __i40e_process_skb_fields(struct i40e_ring *rx_ring, + union i40e_rx_desc *rx_desc, struct sk_buff *skb); void i40e_process_skb_fields(struct i40e_ring *rx_ring, union i40e_rx_desc *rx_desc, struct sk_buff *skb); void i40e_xdp_ring_update_tail(struct i40e_ring *xdp_ring); diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c index 9f47388eaba5..8741dff82bd1 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c @@ -3,6 +3,7 @@ #include #include +#include #include #include "i40e_txrx_common.h" #include "i40e_xsk.h" @@ -277,70 +278,6 @@ bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count) return count == nb_buffs; } -/** - * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer - * @rx_ring: Rx ring - * @xdp: xdp_buff - * - * This functions allocates a new skb from a zero-copy Rx buffer. - * - * Returns the skb, or NULL on failure. - **/ -static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring, - struct xdp_buff *xdp) -{ - unsigned int totalsize = xdp->data_end - xdp->data_meta; - unsigned int metasize = xdp->data - xdp->data_meta; - struct skb_shared_info *sinfo = NULL; - struct sk_buff *skb; - u32 nr_frags = 0; - - if (unlikely(xdp_buff_has_frags(xdp))) { - sinfo = xdp_get_shared_info_from_buff(xdp); - nr_frags = sinfo->nr_frags; - } - net_prefetch(xdp->data_meta); - - /* allocate a skb to store the frags */ - skb = napi_alloc_skb(&rx_ring->q_vector->napi, totalsize); - if (unlikely(!skb)) - goto out; - - memcpy(__skb_put(skb, totalsize), xdp->data_meta, - ALIGN(totalsize, sizeof(long))); - - if (metasize) { - skb_metadata_set(skb, metasize); - __skb_pull(skb, metasize); - } - - if (likely(!xdp_buff_has_frags(xdp))) - 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]; - struct page *page; - void *addr; - - page = dev_alloc_page(); - if (!page) { - dev_kfree_skb(skb); - return NULL; - } - 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)); - } - -out: - xsk_buff_free(xdp); - return skb; -} - static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp_buff, union i40e_rx_desc *rx_desc, @@ -372,21 +309,28 @@ static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring, * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that * SBP is *not* set in PRT_SBPVSI (default not set). */ - skb = i40e_construct_skb_zc(rx_ring, xdp_buff); + skb = xdp_build_skb_from_zc(xdp_buff); if (!skb) { + xsk_buff_free(xdp_buff); rx_ring->rx_stats.alloc_buff_failed++; *rx_packets = 0; *rx_bytes = 0; return; } + /* xdp_build_skb_from_zc() already ran eth_type_trans() and + * skb_record_rx_queue(). Restore the Ethernet header only for + * eth_skb_pad(), then pull it back. + */ + __skb_push(skb, ETH_HLEN); if (eth_skb_pad(skb)) { *rx_packets = 0; *rx_bytes = 0; return; } + __skb_pull(skb, ETH_HLEN); - i40e_process_skb_fields(rx_ring, rx_desc, skb); + __i40e_process_skb_fields(rx_ring, rx_desc, skb); napi_gro_receive(&rx_ring->q_vector->napi, skb); return; } -- 2.25.1