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 F3638C4332F for ; Tue, 27 Dec 2022 03:20:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230490AbiL0DUb (ORCPT ); Mon, 26 Dec 2022 22:20:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230495AbiL0DU3 (ORCPT ); Mon, 26 Dec 2022 22:20:29 -0500 Received: from mail-qt1-x836.google.com (mail-qt1-x836.google.com [IPv6:2607:f8b0:4864:20::836]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 067A5F53 for ; Mon, 26 Dec 2022 19:20:27 -0800 (PST) Received: by mail-qt1-x836.google.com with SMTP id v14so6903890qtq.3 for ; Mon, 26 Dec 2022 19:20:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=dLnMTpyQqB75myk8UxU8Vbr5k1krfBMo6emh4PCa8ZE=; b=DYK6oxs9yqLCLIiGD9lYl4zMwSWqvmkNXPXKEyKtg0EgjG0/VfIcru1Xq//k1P1NXB fQrrXLKg377e24kJPsJm+OVG4nPLmyDRTP8/JQ08eJgEQjs51wxhYu08Xii3j1tbgQ+5 ozXBMUlueSzdkbk1Kmp5GCGdkkaft4Dif7VE0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=dLnMTpyQqB75myk8UxU8Vbr5k1krfBMo6emh4PCa8ZE=; b=QizzQSGIwGREDUCbI94TyDK6wTu9BquAALcsEnT3a8uxTDG6pv1Ue3kdsl3NdbuBAk ZUaQWYJq0MiLKJiFCuB+vzxudWVjwV/0N0CMbiNGsyxY0FwKDuJVJ9HoWJX1vu/YtSku m811V/8+aee08DmonyuIgQ/r6Ks9VenP8yApQzh4P6BCZTTtw/X3NShwgoJSt9ZM4yMG FBLoI40Z2DfkF/MjdInozLqak1KFbZ9E+XEJGeDXVs2e0hkoIp9PZvPVwA7lNLIwq07b 6/GdblxAJiQ3Zk2P4sspBRI0fmcNYrvf4bFYGb9fv/WPfedGAbX1ftNuEhHc0P/jjcac qSUw== X-Gm-Message-State: AFqh2kr0uXzmMp8L95DIed7xUU5wk/ooHa17XbE43pTuFnCioNNmhGW6 u2aXzPBzUV1Iay5R+kwHcRO/4Q== X-Google-Smtp-Source: AMrXdXvFIPFkx+yW03Oq+y5mlAOXXHT7xdZUhi5KWyehMv74qDVIcmuC2897u3qCSx/BoQOvhZuchg== X-Received: by 2002:ac8:4656:0:b0:3a8:4b7:5bcb with SMTP id f22-20020ac84656000000b003a804b75bcbmr25869324qto.62.1672111226452; Mon, 26 Dec 2022 19:20:26 -0800 (PST) Received: from localhost.swdvt.lab.broadcom.net ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id fa11-20020a05622a4ccb00b003a68fe872a5sm7751262qtb.96.2022.12.26.19.20.25 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 26 Dec 2022 19:20:25 -0800 (PST) From: Michael Chan To: davem@davemloft.net Cc: netdev@vger.kernel.org, kuba@kernel.org, edumazet@google.com, pabeni@redhat.com, bpf@vger.kernel.org, gospo@broadcom.com Subject: [PATCH net 4/5] bnxt_en: Fix first buffer size calculations for XDP multi-buffer Date: Mon, 26 Dec 2022 22:19:39 -0500 Message-Id: <1672111180-19463-5-git-send-email-michael.chan@broadcom.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1672111180-19463-1-git-send-email-michael.chan@broadcom.com> References: <1672111180-19463-1-git-send-email-michael.chan@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000b456d605f0c6bb25" Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org --000000000000b456d605f0c6bb25 The size of the first buffer is always page size, and the useable space is the page size minus the offset and the skb_shared_info size. Make sure SKB and XDP buf sizes match so that the skb_shared_info is at the same offset seen from the SKB and XDP_BUF. build_skb() should be passed PAGE_SIZE. xdp_init_buff() should be passed PAGE_SIZE as well. xdp_get_shared_info_from_buff() will automatically deduct the skb_shared_info size if the XDP buffer has frags. There is no need to keep bp->xdp_has_frags. Change BNXT_PAGE_MODE_BUF_SIZE to BNXT_MAX_PAGE_MODE_MTU_SBUF since this constant is really the MTU with ethernet header size subtracted. Also fix the BNXT_MAX_PAGE_MODE_MTU macro with proper parentheses. Fixes: 32861236190b ("bnxt: change receive ring space parameters") Reviewed-by: Somnath Kotur Reviewed-by: Andy Gospodarek Signed-off-by: Michael Chan --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 9 +++++---- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 15 +++++++++++---- drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 7 +------ 3 files changed, 17 insertions(+), 14 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 1acabfe26db1..a21c6829e301 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -991,8 +991,7 @@ static struct sk_buff *bnxt_rx_multi_page_skb(struct bnxt *bp, dma_addr -= bp->rx_dma_offset; dma_unmap_page_attrs(&bp->pdev->dev, dma_addr, PAGE_SIZE, bp->rx_dir, DMA_ATTR_WEAK_ORDERING); - skb = build_skb(page_address(page), BNXT_PAGE_MODE_BUF_SIZE + - bp->rx_dma_offset); + skb = build_skb(page_address(page), PAGE_SIZE); if (!skb) { __free_page(page); return NULL; @@ -3969,8 +3968,10 @@ void bnxt_set_ring_params(struct bnxt *bp) bp->rx_agg_ring_mask = (bp->rx_agg_nr_pages * RX_DESC_CNT) - 1; if (BNXT_RX_PAGE_MODE(bp)) { - rx_space = BNXT_PAGE_MODE_BUF_SIZE; - rx_size = BNXT_MAX_PAGE_MODE_MTU; + rx_space = PAGE_SIZE; + rx_size = PAGE_SIZE - + ALIGN(max(NET_SKB_PAD, XDP_PACKET_HEADROOM), 8) - + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); } else { rx_size = SKB_DATA_ALIGN(BNXT_RX_COPY_THRESH + NET_IP_ALIGN); rx_space = rx_size + NET_SKB_PAD + diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index 41c6dd0ae447..5163ef4a49ea 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -591,12 +591,20 @@ struct nqe_cn { #define BNXT_RX_PAGE_SIZE (1 << BNXT_RX_PAGE_SHIFT) #define BNXT_MAX_MTU 9500 -#define BNXT_PAGE_MODE_BUF_SIZE \ + +/* First RX buffer page in XDP multi-buf mode + * + * +-------------------------------------------------------------------------+ + * | XDP_PACKET_HEADROOM | bp->rx_buf_use_size | skb_shared_info| + * | (bp->rx_dma_offset) | | | + * +-------------------------------------------------------------------------+ + */ +#define BNXT_MAX_PAGE_MODE_MTU_SBUF \ ((unsigned int)PAGE_SIZE - VLAN_ETH_HLEN - NET_IP_ALIGN - \ XDP_PACKET_HEADROOM) #define BNXT_MAX_PAGE_MODE_MTU \ - BNXT_PAGE_MODE_BUF_SIZE - \ - SKB_DATA_ALIGN((unsigned int)sizeof(struct skb_shared_info)) + (BNXT_MAX_PAGE_MODE_MTU_SBUF - \ + SKB_DATA_ALIGN((unsigned int)sizeof(struct skb_shared_info))) #define BNXT_MIN_PKT_SIZE 52 @@ -2134,7 +2142,6 @@ struct bnxt { #define BNXT_DUMP_CRASH 1 struct bpf_prog *xdp_prog; - u8 xdp_has_frags; struct bnxt_ptp_cfg *ptp_cfg; u8 ptp_all_rx_tstamp; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c index 2ceeaa818c1c..36d5202c0aee 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c @@ -193,9 +193,6 @@ void bnxt_xdp_buff_init(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, mapping = rx_buf->mapping - bp->rx_dma_offset; dma_sync_single_for_cpu(&pdev->dev, mapping + offset, len, bp->rx_dir); - if (bp->xdp_has_frags) - buflen = BNXT_PAGE_MODE_BUF_SIZE + offset; - xdp_init_buff(xdp, buflen, &rxr->xdp_rxq); xdp_prepare_buff(xdp, data_ptr - offset, offset, len, false); } @@ -404,10 +401,8 @@ static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog) netdev_warn(dev, "ethtool rx/tx channels must be combined to support XDP.\n"); return -EOPNOTSUPP; } - if (prog) { + if (prog) tx_xdp = bp->rx_nr_rings; - bp->xdp_has_frags = prog->aux->xdp_has_frags; - } tc = netdev_get_num_tc(dev); if (!tc) -- 2.18.1 --000000000000b456d605f0c6bb25 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic 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