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 DCBAAC433EF for ; Wed, 8 Jun 2022 06:01:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234706AbiFHGBi (ORCPT ); Wed, 8 Jun 2022 02:01:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234700AbiFHFtH (ORCPT ); Wed, 8 Jun 2022 01:49:07 -0400 Received: from EX-PRD-EDGE02.vmware.com (ex-prd-edge02.vmware.com [208.91.3.34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD80F40C127; Tue, 7 Jun 2022 20:24:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; s=s1024; d=vmware.com; h=from:to:cc:subject:date:message-id:in-reply-to:mime-version: content-type; bh=j8wwcqtmDC2RnTjeTTDk0Jan/92OOGtSGZvFDg9KNRY=; b=gVT2fifgYoab+wS0x60o5zpBjKCQIUOCsx7xMEZcX1H/ZkzBa8TZGFzicI+nzm ujeRUI2qijGE58QkoHkae881o3JuZHI2DVW8ew/y4Z9csLq31e3L38kd8fg8wb VH/TU9QHYDt7jJjRUDUTDV1OOqxu+CQ8LZoK6tFee1+Lwi8= Received: from sc9-mailhost1.vmware.com (10.113.161.71) by EX-PRD-EDGE02.vmware.com (10.188.245.7) with Microsoft SMTP Server id 15.1.2308.14; Tue, 7 Jun 2022 20:24:01 -0700 Received: from htb-1n-eng-dhcp122.eng.vmware.com (unknown [10.20.114.216]) by sc9-mailhost1.vmware.com (Postfix) with ESMTP id 7DE2623447; Tue, 7 Jun 2022 20:24:07 -0700 (PDT) Received: by htb-1n-eng-dhcp122.eng.vmware.com (Postfix, from userid 0) id 7851DAA454; Tue, 7 Jun 2022 20:24:07 -0700 (PDT) From: Ronak Doshi To: CC: Ronak Doshi , VMware PV-Drivers Reviewers , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , open list Subject: [PATCH v3 net-next 6/8] vmxnet3: limit number of TXDs used for TSO packet Date: Tue, 7 Jun 2022 20:23:51 -0700 Message-ID: <20220608032353.964-7-doshir@vmware.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20220608032353.964-1-doshir@vmware.com> References: <20220608032353.964-1-doshir@vmware.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: None (EX-PRD-EDGE02.vmware.com: doshir@vmware.com does not designate permitted sender hosts) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Currently, vmxnet3 does not have a limit on number of descriptors used for a TSO packet. However, with UPT, for hardware performance reasons, this patch limits the number of transmit descriptors to 24 for a TSO packet. Signed-off-by: Ronak Doshi Acked-by: Guolin Yang --- drivers/net/vmxnet3/vmxnet3_defs.h | 2 ++ drivers/net/vmxnet3/vmxnet3_drv.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/drivers/net/vmxnet3/vmxnet3_defs.h b/drivers/net/vmxnet3/vmxnet3_defs.h index 415e4c9993ef..cb9dc72f2b3d 100644 --- a/drivers/net/vmxnet3/vmxnet3_defs.h +++ b/drivers/net/vmxnet3/vmxnet3_defs.h @@ -400,6 +400,8 @@ union Vmxnet3_GenericDesc { /* max # of tx descs for a non-tso pkt */ #define VMXNET3_MAX_TXD_PER_PKT 16 +/* max # of tx descs for a tso pkt */ +#define VMXNET3_MAX_TSO_TXD_PER_PKT 24 /* Max size of a single rx buffer */ #define VMXNET3_MAX_RX_BUF_SIZE ((1 << 14) - 1) diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c index c2f99c01a130..2ee3a2e39f10 100644 --- a/drivers/net/vmxnet3/vmxnet3_drv.c +++ b/drivers/net/vmxnet3/vmxnet3_drv.c @@ -1061,6 +1061,23 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq, } tq->stats.copy_skb_header++; } + if (unlikely(count > VMXNET3_MAX_TSO_TXD_PER_PKT)) { + /* tso pkts must not use more than + * VMXNET3_MAX_TSO_TXD_PER_PKT entries + */ + if (skb_linearize(skb) != 0) { + tq->stats.drop_too_many_frags++; + goto drop_pkt; + } + tq->stats.linearized++; + + /* recalculate the # of descriptors to use */ + count = VMXNET3_TXD_NEEDED(skb_headlen(skb)) + 1; + if (unlikely(count > VMXNET3_MAX_TSO_TXD_PER_PKT)) { + tq->stats.drop_too_many_frags++; + goto drop_pkt; + } + } if (skb->encapsulation) { vmxnet3_prepare_inner_tso(skb, &ctx); } else { -- 2.11.0