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 X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 3C29FC4727E for ; Wed, 30 Sep 2020 15:42:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ED50B207FB for ; Wed, 30 Sep 2020 15:42:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601480558; bh=eKPJVzu6E5/S5wENfNGlIxA6X+/VOWn+imBWPRph7Mk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=X7zni9F3tuFxpWbeB/esTMo6pLItspY5KzVy1XfCZn1qYrAYgFxxyg4pYQYhH53Qc f5UaMGrQzxX6PHFNLyyN9kCgQcrOADz/pho09e/vc7mTCKQBjVkvqAwYOhpCEoMshZ aphYwkMf++c2h5zGL8Q7b/T0FLDawasf0FUgYZi8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731029AbgI3Pmh (ORCPT ); Wed, 30 Sep 2020 11:42:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:53024 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727438AbgI3Pmg (ORCPT ); Wed, 30 Sep 2020 11:42:36 -0400 Received: from lore-desk.redhat.com (unknown [176.207.245.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D35B520738; Wed, 30 Sep 2020 15:42:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601480555; bh=eKPJVzu6E5/S5wENfNGlIxA6X+/VOWn+imBWPRph7Mk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=amWYgM4RMH0spzqabcGmncwJmv6YRYnhBBsN+xvxOrT2yjThaD+CfqACQFOSGZ6To dGDABoZr3vdAbPcqcgd0WrdCxYFfFegG2v+44XRQ3T9ArbWHYE7ZPm3AmTEO6XqiEM 2lxtSTMy8cDyIXfMtdBLc11CDA+wLS6rjJBloDzk= From: Lorenzo Bianconi To: netdev@vger.kernel.org Cc: bpf@vger.kernel.org, davem@davemloft.net, sameehj@amazon.com, kuba@kernel.org, john.fastabend@gmail.com, daniel@iogearbox.net, ast@kernel.org, shayagr@amazon.com, brouer@redhat.com, echaudro@redhat.com, lorenzo.bianconi@redhat.com, dsahern@kernel.org Subject: [PATCH v3 net-next 03/12] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Date: Wed, 30 Sep 2020 17:41:54 +0200 Message-Id: <381e1fa2fb5c091780677a9b4f2518a2b3c591a0.1601478613.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.26.2 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 Signed-off-by: Lorenzo Bianconi --- drivers/net/ethernet/marvell/mvneta.c | 42 +++++++++++++++++---------- 1 file changed, 26 insertions(+), 16 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index d095718355d3..a431e8478297 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -2027,12 +2027,17 @@ static void mvneta_xdp_put_buff(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, struct xdp_buff *xdp, int sync_len, bool napi) { - struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); + struct skb_shared_info *sinfo; int i; + if (likely(!xdp->mb)) + goto out; + + sinfo = xdp_get_shared_info_from_buff(xdp); for (i = 0; i < sinfo->nr_frags; i++) page_pool_put_full_page(rxq->page_pool, skb_frag_page(&sinfo->frags[i]), napi); +out: page_pool_put_page(rxq->page_pool, virt_to_head_page(xdp->data), sync_len, napi); } @@ -2234,7 +2239,6 @@ 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; @@ -2259,9 +2263,6 @@ mvneta_swbm_rx_frame(struct mvneta_port *pp, xdp->data = data + pp->rx_offset_correction + MVNETA_MH_SIZE; xdp->data_end = xdp->data + data_len; xdp_set_data_meta_invalid(xdp); - - sinfo = xdp_get_shared_info_from_buff(xdp); - sinfo->nr_frags = 0; } static void @@ -2272,9 +2273,9 @@ mvneta_swbm_add_rx_fragment(struct mvneta_port *pp, struct page *page) { struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); + int data_len, len, nfrags = xdp->mb ? sinfo->nr_frags : 0; struct net_device *dev = pp->dev; enum dma_data_direction dma_dir; - int data_len, len; if (*size > MVNETA_MAX_RX_BUF_SIZE) { len = MVNETA_MAX_RX_BUF_SIZE; @@ -2288,17 +2289,21 @@ mvneta_swbm_add_rx_fragment(struct mvneta_port *pp, rx_desc->buf_phys_addr, len, dma_dir); - if (data_len > 0 && sinfo->nr_frags < MAX_SKB_FRAGS) { - skb_frag_t *frag = &sinfo->frags[sinfo->nr_frags]; + if (data_len > 0 && nfrags < MAX_SKB_FRAGS) { + skb_frag_t *frag = &sinfo->frags[nfrags]; skb_frag_off_set(frag, pp->rx_offset_correction); skb_frag_size_set(frag, data_len); __skb_frag_set_page(frag, page); - sinfo->nr_frags++; - - rx_desc->buf_phys_addr = 0; + nfrags++; + } else { + page_pool_put_full_page(rxq->page_pool, page, true); } + + rx_desc->buf_phys_addr = 0; + sinfo->nr_frags = nfrags; *size -= len; + xdp->mb = 1; } static struct sk_buff * @@ -2306,7 +2311,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, 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; + int i, num_frags = xdp->mb ? sinfo->nr_frags : 0; struct sk_buff *skb; skb = build_skb(xdp->data_hard_start, PAGE_SIZE); @@ -2319,6 +2324,9 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct mvneta_rx_queue *rxq, skb_put(skb, xdp->data_end - xdp->data); mvneta_rx_csum(pp, desc_status, skb); + if (likely(!xdp->mb)) + return skb; + for (i = 0; i < num_frags; i++) { skb_frag_t *frag = &sinfo->frags[i]; @@ -2338,13 +2346,14 @@ static int mvneta_rx_swbm(struct napi_struct *napi, { int rx_proc = 0, rx_todo, refill, size = 0; struct net_device *dev = pp->dev; - struct xdp_buff xdp_buf = { - .frame_sz = PAGE_SIZE, - .rxq = &rxq->xdp_rxq, - }; struct mvneta_stats ps = {}; struct bpf_prog *xdp_prog; u32 desc_status, frame_sz; + struct xdp_buff xdp_buf; + + xdp_buf.data_hard_start = NULL; + xdp_buf.frame_sz = PAGE_SIZE; + xdp_buf.rxq = &rxq->xdp_rxq; /* Get number of received packets */ rx_todo = mvneta_rxq_busy_desc_num_get(pp, rxq); @@ -2377,6 +2386,7 @@ static int mvneta_rx_swbm(struct napi_struct *napi, frame_sz = size - ETH_FCS_LEN; desc_status = rx_status; + xdp_buf.mb = 0; mvneta_swbm_rx_frame(pp, rx_desc, rxq, &xdp_buf, &size, page); } else { -- 2.26.2