From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f50.google.com (mail-pj1-f50.google.com [209.85.216.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 474503A2548 for ; Wed, 8 Apr 2026 23:06:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.50 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775689588; cv=none; b=Z3Sp61FSunbF37xaT2DFh9rgVUShPtBJuwbgQzcOuk/UHWyhDj7epzZ3LrrHtqA0BRSLuk0PhSvI4z0QTG0Y6I/dLFom2+umFUqNHHJGNTxz+POw8+y0JhXerJ/52Lpz+c8en8lv2mdyYMLwqQWgFHCEwule3xW9u9Y6YZiwsXw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775689588; c=relaxed/simple; bh=8w1yvo40Mcow3i5mEHFfEWtVjjXczfx9WgRXGd/eCtU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Z9InIRGQYrMZNkzCwmc/CPF4Y4BhypWc4tKinBjo1TZKm167wpXJvfHFoCo01ms+YU+kqRE281B18fDz2cE/e2W9l/PsP1y3YXqgFR661dgoMawUcviC2/Hb2V/yB6pW1KYQxcvCtT8pBSi1zKXpDKHUKufyvKd/mA1FaYZQ4ew= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dama.to; spf=none smtp.mailfrom=dama.to; dkim=pass (2048-bit key) header.d=dama-to.20251104.gappssmtp.com header.i=@dama-to.20251104.gappssmtp.com header.b=ugwuwA1A; arc=none smtp.client-ip=209.85.216.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dama.to Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=dama.to Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dama-to.20251104.gappssmtp.com header.i=@dama-to.20251104.gappssmtp.com header.b="ugwuwA1A" Received: by mail-pj1-f50.google.com with SMTP id 98e67ed59e1d1-35da9c0c007so307352a91.2 for ; Wed, 08 Apr 2026 16:06:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dama-to.20251104.gappssmtp.com; s=20251104; t=1775689582; x=1776294382; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=MnRAQ5V4t4u8fZFyOBxhZgdMrI5z8qJPA9QEsYZg+gU=; b=ugwuwA1ArHv8bLM+5ew3jp4RuUYzJo0dV+3d12eR7KOmqrxmaIWy1lOk5FNaFgoX03 vIAKL5slMaQ+g86G7DwYW3Kl8bitULZMpdihbE3bXx6AW6BHkI5w3oTNOLi+zoDftCVt mWUQcfc+1MvKtXfE84CjCDsp0+er+ZOgf7UcS15SBMryJoVT0ECVuHIF0QqoQsBaEu+T m3KFUO/eVGUYARNJgikUT99hjNT5naWUyiyF6sad5ZTT+98Wbl5O4iPJhbPOYLYIr8EH r43pPhp6ApzR4L7hhzVxVLjjNdbh+N5uPI1C5rRQqKfOo/CgZaby+2piKmlPjtlZPNqJ Ntog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775689582; x=1776294382; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=MnRAQ5V4t4u8fZFyOBxhZgdMrI5z8qJPA9QEsYZg+gU=; b=aA88TrlaywNc/muNKHWQGDo/78vpYwkt4059MwpBJBSG8egGVjCnVzlFR6u5zK+vTc 5sdBNLWx3bkPxpYAk19+BohPArtNoMOyTYL1sdKt2pRfP1JC+LV8V/pJbS/pfEy1KT/m +/U5JtUyshxpN4JtBpL5H8lXPWOuvNoGNoyCf3oBzlC6bTGlK0XJX1skEtNqX3kQE/FW i3Qkto45dmsTqu2LYAGbvZrm2QxB74Tc+bcosqP20Eo0R+DeZK9Ab3+pbgx5jfcyfifC rCo1OiDv40dnuHwRybs1MfZ4N3nlC5KQYhd+LAs1ih3L468VlBg1Z/TKSsgSJJfocV3y 0eJA== X-Gm-Message-State: AOJu0YxG+1mWBFvKCCQDuKyxPX0ls3Okx/JtUQGIPtOZxpMvXD4epGjJ afAqvBj1J81ioZ3WfpAOlveQlnGIzR5KjqTiZAWb5xYNVsrGGA5tEJv6f2O0FrFwnYvDLVI3Ta2 xLPhqrUc= X-Gm-Gg: AeBDies0SgRF4cFbll1rQKeac9H2Y6BSzcWzMkLA4oeNat3orH8RGiOMbrPeren999t kUrf64UxEKWu0MImWCiPvfcYL2LYBTJCCEuTQVTXo3TW+4wusVia51CiKxCW5J/p0Wx7jFJoyF8 XlQD0ZDeNTolcG96PjVnYC5Zn0Il4Y7l5KLTcYfO7EGhTeUXpSSVilohTG270JsfLbZQf7j4HSS ttX5mwTpZ99ZCmilihHDwLdma4+By1+hG/Z+XTihOTWvP1uuMlTKrqI9o2rIzjDZHj6Z3Ot+DGw 06sbJ2GSxPIshoQE+7d1sDqUd44ZJTHqf7YarKvZs/pSq59Sh0PDZcImJ7ci+yB2ya7iyh8oNtG okGGpk6KzGlcB3ap2so3BMbvayPo8+IqB++hqiPFdtEJsoCbjYYM9vxTNfY4IzNt14ovjI4J38B kZdBE= X-Received: by 2002:a17:90b:4a48:b0:35d:a861:36dd with SMTP id 98e67ed59e1d1-35de691b2fdmr22131751a91.25.1775689582234; Wed, 08 Apr 2026 16:06:22 -0700 (PDT) Received: from localhost ([2a03:2880:2ff:9::]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b274756621sm210947835ad.20.2026.04.08.16.06.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2026 16:06:21 -0700 (PDT) From: Joe Damato To: netdev@vger.kernel.org, Michael Chan , Pavan Chebbi , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: horms@kernel.org, linux-kernel@vger.kernel.org, leon@kernel.org, Joe Damato Subject: [net-next v10 05/10] net: bnxt: Add TX inline buffer infrastructure Date: Wed, 8 Apr 2026 16:05:54 -0700 Message-ID: <20260408230607.2019402-6-joe@dama.to> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260408230607.2019402-1-joe@dama.to> References: <20260408230607.2019402-1-joe@dama.to> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add per-ring pre-allocated inline buffer fields (tx_inline_buf, tx_inline_dma, tx_inline_size) to bnxt_tx_ring_info and helpers to allocate and free them. A producer and consumer (tx_inline_prod, tx_inline_cons) are added to track which slot(s) of the inline buffer are in-use. The inline buffer will be used by the SW USO path for pre-allocated, pre-DMA-mapped per-segment header copies. In the future, this could be extended to support TX copybreak. Allocation helper is marked __maybe_unused in this commit because it will be wired in later. Suggested-by: Jakub Kicinski Reviewed-by: Pavan Chebbi Signed-off-by: Joe Damato --- v5: - Added Pavan's Reviewed-by. No functional changes. rfcv2: - Added a producer and consumer to correctly track the in use header slots. drivers/net/ethernet/broadcom/bnxt/bnxt.c | 35 +++++++++++++++++++++++ drivers/net/ethernet/broadcom/bnxt/bnxt.h | 6 ++++ 2 files changed, 41 insertions(+) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index bc2dac2f137d..bd93edb09ee0 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -3979,6 +3979,39 @@ static int bnxt_alloc_rx_rings(struct bnxt *bp) return rc; } +static void bnxt_free_tx_inline_buf(struct bnxt_tx_ring_info *txr, + struct pci_dev *pdev) +{ + if (!txr->tx_inline_buf) + return; + + dma_unmap_single(&pdev->dev, txr->tx_inline_dma, + txr->tx_inline_size, DMA_TO_DEVICE); + kfree(txr->tx_inline_buf); + txr->tx_inline_buf = NULL; + txr->tx_inline_size = 0; +} + +static int __maybe_unused bnxt_alloc_tx_inline_buf(struct bnxt_tx_ring_info *txr, + struct pci_dev *pdev, + unsigned int size) +{ + txr->tx_inline_buf = kmalloc(size, GFP_KERNEL); + if (!txr->tx_inline_buf) + return -ENOMEM; + + txr->tx_inline_dma = dma_map_single(&pdev->dev, txr->tx_inline_buf, + size, DMA_TO_DEVICE); + if (dma_mapping_error(&pdev->dev, txr->tx_inline_dma)) { + kfree(txr->tx_inline_buf); + txr->tx_inline_buf = NULL; + return -ENOMEM; + } + txr->tx_inline_size = size; + + return 0; +} + static void bnxt_free_tx_rings(struct bnxt *bp) { int i; @@ -3997,6 +4030,8 @@ static void bnxt_free_tx_rings(struct bnxt *bp) txr->tx_push = NULL; } + bnxt_free_tx_inline_buf(txr, pdev); + ring = &txr->tx_ring_struct; bnxt_free_ring(bp, &ring->ring_mem); diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index 83b4136ccd31..d98a58aa30f6 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -996,6 +996,12 @@ struct bnxt_tx_ring_info { dma_addr_t tx_push_mapping; __le64 data_mapping; + void *tx_inline_buf; + dma_addr_t tx_inline_dma; + unsigned int tx_inline_size; + u16 tx_inline_prod; + u16 tx_inline_cons; + #define BNXT_DEV_STATE_CLOSING 0x1 u32 dev_state; -- 2.52.0