From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6F81AC433F5 for ; Sat, 8 Jan 2022 11:54:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234171AbiAHLyL (ORCPT ); Sat, 8 Jan 2022 06:54:11 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:51360 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233445AbiAHLyH (ORCPT ); Sat, 8 Jan 2022 06:54:07 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B4BF3B80860; Sat, 8 Jan 2022 11:54:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AD991C36AF4; Sat, 8 Jan 2022 11:54:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1641642844; bh=YIage8pUfDnpHuklMDcwms7LxvBYaTELfUtcJrrdgUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RJi5+Z1rkNq0IxP7ZDKMIqNvKMgmeT3cbvYGQmeZpibGBIkV/2cAFztYOsJKoq0YS Anqs2mOmT1/9USwFKM9+pizGrvp4Nq6wlVd2OfrJib/RBrP4bXxTe/ek98+LuTTBdi 4OrmlITIw9AG6VV2MEh63Gq5cxAHDMYwcG8PtsIFPhTP8+f6opI3H6EkQpQUg1Ospw +pY5EYfAO8dT1PiB/Szjqihjc5MW9++kEH0Dr61UrFnHo2bDqtyZHLloC6omIX1cW8 LNtoiKN+r1Vp3ApNHc6JHX0MuYk4AbfZlfmcZNySnCGxmJLQt4x7+Q1PeAtMzowhGH 8/nL0I8OIn4jA== From: Lorenzo Bianconi To: bpf@vger.kernel.org, netdev@vger.kernel.org Cc: lorenzo.bianconi@redhat.com, davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, shayagr@amazon.com, john.fastabend@gmail.com, dsahern@kernel.org, brouer@redhat.com, echaudro@redhat.com, jasowang@redhat.com, alexander.duyck@gmail.com, saeed@kernel.org, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, tirthendu.sarkar@intel.com, toke@redhat.com Subject: [PATCH v21 bpf-next 03/23] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Date: Sat, 8 Jan 2022 12:53:06 +0100 Message-Id: <8cef550928a17390d4257b3a0cae18e15f4c9a58.1641641663.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Update multi-buffer bit (mb) in xdp_buff to notify XDP/eBPF layer and XDP remote drivers if this is a "non-linear" XDP buffer. Access skb_shared_info only if xdp_buff mb is set in order to avoid possible cache-misses. Acked-by: Toke Hoiland-Jorgensen Acked-by: John Fastabend Signed-off-by: Lorenzo Bianconi --- drivers/net/ethernet/marvell/mvneta.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index 83c8908f0cc7..f97e764ec5b3 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -2065,9 +2065,14 @@ mvneta_xdp_put_buff(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, { int i; + if (likely(!xdp_buff_is_mb(xdp))) + goto out; + for (i = 0; i < sinfo->nr_frags; i++) page_pool_put_full_page(rxq->page_pool, skb_frag_page(&sinfo->frags[i]), true); + +out: page_pool_put_page(rxq->page_pool, virt_to_head_page(xdp->data), sync_len, true); } @@ -2269,7 +2274,6 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp, int data_len = -MVNETA_MH_SIZE, len; struct net_device *dev = pp->dev; enum dma_data_direction dma_dir; - struct skb_shared_info *sinfo; if (*size > MVNETA_MAX_RX_BUF_SIZE) { len = MVNETA_MAX_RX_BUF_SIZE; @@ -2289,11 +2293,9 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp, /* Prefetch header */ prefetch(data); + xdp_buff_clear_mb(xdp); xdp_prepare_buff(xdp, data, pp->rx_offset_correction + MVNETA_MH_SIZE, data_len, false); - - sinfo = xdp_get_shared_info_from_buff(xdp); - sinfo->nr_frags = 0; } static void @@ -2327,6 +2329,9 @@ mvneta_swbm_add_rx_fragment(struct mvneta_port *pp, skb_frag_off_set(frag, pp->rx_offset_correction); skb_frag_size_set(frag, data_len); __skb_frag_set_page(frag, page); + + if (!xdp_buff_is_mb(xdp)) + xdp_buff_set_mb(xdp); } else { page_pool_put_full_page(rxq->page_pool, page, true); } @@ -2348,8 +2353,12 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct page_pool *pool, struct xdp_buff *xdp, u32 desc_status) { struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); - int i, num_frags = sinfo->nr_frags; struct sk_buff *skb; + u8 num_frags; + int i; + + if (unlikely(xdp_buff_is_mb(xdp))) + num_frags = sinfo->nr_frags; skb = build_skb(xdp->data_hard_start, PAGE_SIZE); if (!skb) @@ -2361,6 +2370,9 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct page_pool *pool, skb_put(skb, xdp->data_end - xdp->data); skb->ip_summed = mvneta_rx_csum(pp, desc_status); + if (likely(!xdp_buff_is_mb(xdp))) + goto out; + for (i = 0; i < num_frags; i++) { skb_frag_t *frag = &sinfo->frags[i]; @@ -2369,6 +2381,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct page_pool *pool, skb_frag_size(frag), PAGE_SIZE); } +out: return skb; } -- 2.33.1