From patchwork Fri Aug 13 11:47:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 12435327 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F8F8C4338F for ; Fri, 13 Aug 2021 11:49:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 28B13610CF for ; Fri, 13 Aug 2021 11:49:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239132AbhHMLt6 (ORCPT ); Fri, 13 Aug 2021 07:49:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:44674 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238500AbhHMLt6 (ORCPT ); Fri, 13 Aug 2021 07:49:58 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8153461042; Fri, 13 Aug 2021 11:49:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1628855371; bh=rbrrkyvO26qzZ98al19VojAxALmWVIqFyBIw3Ad6vWY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hivGn58k6jP0TsPwRFkPSieymHah7FpVXGeLVFhlI8+i8x+8lfJs01kD4uN4aDjRK xaqssdK+2+wAl/0ZA0YOYMp08G4+DjPVfoBLkzyqgH6HHyzIMcVTyiJ7RqEeXYYSqU K+KpLaBgsDNhx8ifpVtPoJs2s+RK+Q89emKNqe32KKd3kD3+H44yOG6Sst0vbJK4wv 3o9AT7V129ARq5PGaNGXYF24j73gsYZTf2RkWFyF7rjx7LJuMzbG6C/nu8XoWM+FZj IKQVQW01tmCm1/evhmFy8SJpRIh3ghnwlnV7ZydoDZgkbL1XBNZ3XWPi1HYQqwClmy tmsgfQECM+Dmw== 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 v11 bpf-next 03/18] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Date: Fri, 13 Aug 2021 13:47:44 +0200 Message-Id: <35ddac026662ff5ce193e8370ddbb674651d27a0.1628854454.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net 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. 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 5d1007e1b5c9..9f4858e35566 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -2037,9 +2037,14 @@ 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); } @@ -2241,7 +2246,6 @@ 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; @@ -2261,11 +2265,9 @@ 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 @@ -2299,6 +2301,9 @@ 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); } @@ -2320,8 +2325,12 @@ 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) @@ -2333,6 +2342,9 @@ 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]; @@ -2341,6 +2353,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct page_pool *pool, skb_frag_size(frag), PAGE_SIZE); } +out: return skb; }