From owner-svn-src-head@FreeBSD.ORG Sat Feb 28 14:57:58 2015 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 16B03313; Sat, 28 Feb 2015 14:57:58 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 0294BE07; Sat, 28 Feb 2015 14:57:58 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id t1SEvvJ7009908; Sat, 28 Feb 2015 14:57:57 GMT (envelope-from ngie@FreeBSD.org) Received: (from ngie@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id t1SEvv4Y009907; Sat, 28 Feb 2015 14:57:57 GMT (envelope-from ngie@FreeBSD.org) Message-Id: <201502281457.t1SEvv4Y009907@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: ngie set sender to ngie@FreeBSD.org using -f From: Garrett Cooper Date: Sat, 28 Feb 2015 14:57:57 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r279393 - head/sys/dev/ixgbe X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 Feb 2015 14:57:58 -0000 Author: ngie Date: Sat Feb 28 14:57:57 2015 New Revision: 279393 URL: https://svnweb.freebsd.org/changeset/base/279393 Log: Pad RX copy alignment calculation to avoid illegal memory accesses The optimization made in r239940 is valid for struct mbuf's current structure and size in FreeBSD, but hardcodes assumptions about sizes of struct mbuf, which are unfortunately broken if additional data is added to the beginning of struct mbuf X-MFC note (discussed with rwatson): This change requires the MPKTHSIZE definition, which is only available after head@r277203 and will not be MFCed as it breaks mbuf(9) KPI. A direct commit to stable/10 and merges to other branches to add the necessary definitions to work with the code as-is will be done to facilitate this MFC PR: 194314 MFC after: 2 weeks Approved/Reviewed by: erj, jfv Sponsored by: EMC / Isilon Storage Division Modified: head/sys/dev/ixgbe/ixgbe.h Modified: head/sys/dev/ixgbe/ixgbe.h ============================================================================== --- head/sys/dev/ixgbe/ixgbe.h Sat Feb 28 12:02:32 2015 (r279392) +++ head/sys/dev/ixgbe/ixgbe.h Sat Feb 28 14:57:57 2015 (r279393) @@ -162,8 +162,9 @@ * modern Intel CPUs, results in 40 bytes wasted and a significant drop * in observed efficiency of the optimization, 97.9% -> 81.8%. */ -#define IXGBE_RX_COPY_LEN 160 -#define IXGBE_RX_COPY_ALIGN (MHLEN - IXGBE_RX_COPY_LEN) +#define IXGBE_RX_COPY_HDR_PADDED ((((MPKTHSIZE - 1) / 32) + 1) * 32) +#define IXGBE_RX_COPY_LEN (MSIZE - IXGBE_RX_COPY_HDR_PADDED) +#define IXGBE_RX_COPY_ALIGN (IXGBE_RX_COPY_HDR_PADDED - MPKTHSIZE) /* Keep older OS drivers building... */ #if !defined(SYSCTL_ADD_UQUAD)