From patchwork Mon Apr 15 09:48:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Barker X-Patchwork-Id: 13629729 X-Patchwork-Delegate: kuba@kernel.org Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B036F5733B; Mon, 15 Apr 2024 09:48:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.160.252.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713174521; cv=none; b=CnuFnJ/NevPbi4ZiNLMdjZ5s88Nh7/R4bgMUSz1ll5zkm3q9lrbzH3Ohx2P/pxUvGOilgG1tA1+MccxLSLm3eTdbT9riiNpIP78Nqzk2C2Qxlg2tscSyCH321vcDbVi5CJ/9ttHNhO5Gjup6L2yxdwC2z+g2SOT/dkGPQ6uPQis= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713174521; c=relaxed/simple; bh=0a8sFtUoHMxGNk6So9B9U41s6UQbV0WO1sQRMmFABA4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=GKLl+cP1fo0rFd+r9Xf5ruEhzL7kjOkAK+K0QgIaxfPRLEuKGIZlITXRUE0T/6/0g6CNrX/EaB9Rhx+s1BH5dUmYsQFE3Wb+c7qvUIXPIHOpN3B64gNcdOnS4sS9JOwHTKsxYrRZgCpwxqujK02bHbQJ0tsB7ndueZz+2py9ps4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com; spf=pass smtp.mailfrom=bp.renesas.com; arc=none smtp.client-ip=210.160.252.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bp.renesas.com X-IronPort-AV: E=Sophos;i="6.07,202,1708354800"; d="scan'208";a="205432172" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 15 Apr 2024 18:48:39 +0900 Received: from renesas-deb12.cephei.uk (unknown [10.226.93.74]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 9386E4006DE8; Mon, 15 Apr 2024 18:48:35 +0900 (JST) From: Paul Barker To: Sergey Shtylyov , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Paul Barker , =?utf-8?q?Niklas_S=C3=B6der?= =?utf-8?q?lund?= , Geert Uytterhoeven , netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [net-next RFC v3 5/7] net: ravb: Enable SW IRQ Coalescing for GbEth Date: Mon, 15 Apr 2024 10:48:02 +0100 Message-Id: <20240415094804.8016-6-paul.barker.ct@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240415094804.8016-1-paul.barker.ct@bp.renesas.com> References: <20240415094804.8016-1-paul.barker.ct@bp.renesas.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC Software IRQ Coalescing is required to improve network stack performance in the RZ/G2L SoC family and the RZ/G3S SoC, i.e. the SoCs which use the GbEth IP. This patch gives the following improvements during testing with iperf3: * RZ/G2L: * TCP RX: same bandwidth with -6% CPU load (76% -> 71%) * UDP RX: same bandwidth with -10% CPU load (99% -> 89%) * RZ/G2UL: * UDP RX: +4200% bandwidth (1.23Mbps -> 53Mbps) * RZ/G3S: * UDP RX: +425% bandwidth (1.23Mbps -> 6.46Mbps) The improvement of UDP RX bandwidth for the single core SoCs (RZ/G2UL & RZ/G3S) is particularly critical. Signed-off-by: Paul Barker Reviewed-by: Sergey Shtylyov --- drivers/net/ethernet/renesas/ravb.h | 1 + drivers/net/ethernet/renesas/ravb_main.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h index 71de2a7aa27c..9c6392ade2f1 100644 --- a/drivers/net/ethernet/renesas/ravb.h +++ b/drivers/net/ethernet/renesas/ravb.h @@ -1054,6 +1054,7 @@ struct ravb_hw_info { u32 rx_max_desc_use; u32 rx_desc_size; unsigned aligned_tx: 1; + unsigned needs_irq_coalesce:1; /* Needs software IRQ coalescing */ /* hardware features */ unsigned internal_delay:1; /* AVB-DMAC has internal delays */ diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index 12618171f6d5..26b70b996bd3 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -2663,6 +2663,7 @@ static const struct ravb_hw_info gbeth_hw_info = { .tx_counters = 1, .carrier_counters = 1, .half_duplex = 1, + .needs_irq_coalesce = 1, }; static const struct of_device_id ravb_match_table[] = { @@ -2937,6 +2938,9 @@ static int ravb_probe(struct platform_device *pdev) if (info->nc_queues) netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll); + if (info->needs_irq_coalesce) + netdev_sw_irq_coalesce_default_on(ndev); + /* Network device register */ error = register_netdev(ndev); if (error)