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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 56FBBC04AB6 for ; Tue, 28 May 2019 10:08:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2882020989 for ; Tue, 28 May 2019 10:08:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="ezsSCvuH"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="ezsSCvuH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726661AbfE1KIX (ORCPT ); Tue, 28 May 2019 06:08:23 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:45592 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726345AbfE1KIX (ORCPT ); Tue, 28 May 2019 06:08:23 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id C213360769; Tue, 28 May 2019 10:08:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1559038102; bh=Sy36uPL5uDHOvP4eZU518Q3ctz2pO1yjVuQ/nWsGUog=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=ezsSCvuHNEZDkI516/Zgf7gtIiADaPsqlu9R/8za4cRiRmrPavvU9s8EsctxgGi2W h4tnO6m48arD4bo239S0New9uSK+FPV8G8VN5WYXDJJbPpw25imeixeMAnMqTiEUYR Fw7oKg5nUsyx8MSw1apCSYSAsU3woWEu4Zgd+G30= Received: from [10.206.25.51] (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: aneela@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 24904604BE; Tue, 28 May 2019 10:08:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1559038102; bh=Sy36uPL5uDHOvP4eZU518Q3ctz2pO1yjVuQ/nWsGUog=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=ezsSCvuHNEZDkI516/Zgf7gtIiADaPsqlu9R/8za4cRiRmrPavvU9s8EsctxgGi2W h4tnO6m48arD4bo239S0New9uSK+FPV8G8VN5WYXDJJbPpw25imeixeMAnMqTiEUYR Fw7oKg5nUsyx8MSw1apCSYSAsU3woWEu4Zgd+G30= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 24904604BE Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=aneela@codeaurora.org Subject: Re: netdev_alloc_skb is failing for 16k length To: Stephen Hemminger Cc: netdev@vger.kernel.org, Bjorn Andersson , Chris Lew References: <6891cd8b-a3be-91f5-39c4-7a7e7d498921@codeaurora.org> <20190527075956.26f869ec@hermes.lan> From: Arun Kumar Neelakantam Message-ID: <2ab84730-70ae-4f30-241d-e51bc0c61d16@codeaurora.org> Date: Tue, 28 May 2019 15:38:18 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190527075956.26f869ec@hermes.lan> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 5/27/2019 8:29 PM, Stephen Hemminger wrote: > On Mon, 27 May 2019 12:21:51 +0530 > Arun Kumar Neelakantam wrote: > >> Hi team, >> >> we are using "skb = netdev_alloc_skb(NULL, len);" which is getting >> failed sometimes for len = 16k. >> >> I suspect mostly system memory got fragmented and hence atomic memory >> allocation for 16k is failing, can you please suggest best way to handle >> this failure case. >> >> Thanks >> >> Arun N >> > If you are handling big frames, then put the data in page size chunks > and use build_skb. Thank you. Now using alloc_skb_with_frags() with order 0 to allocate the memory fragments and skb_store_bits() to store the data to skb from buffer.