From owner-svn-src-all@freebsd.org Wed Dec 5 13:39:36 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 942C213137BD; Wed, 5 Dec 2018 13:39:36 +0000 (UTC) (envelope-from slavash@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 3B10A7139B; Wed, 5 Dec 2018 13:39:36 +0000 (UTC) (envelope-from slavash@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 1C285150D0; Wed, 5 Dec 2018 13:39:36 +0000 (UTC) (envelope-from slavash@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wB5DdZTb076421; Wed, 5 Dec 2018 13:39:35 GMT (envelope-from slavash@FreeBSD.org) Received: (from slavash@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wB5DdZQq076420; Wed, 5 Dec 2018 13:39:35 GMT (envelope-from slavash@FreeBSD.org) Message-Id: <201812051339.wB5DdZQq076420@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: slavash set sender to slavash@FreeBSD.org using -f From: Slava Shwartsman Date: Wed, 5 Dec 2018 13:39:35 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r341552 - head/sys/dev/mlx4/mlx4_en X-SVN-Group: head X-SVN-Commit-Author: slavash X-SVN-Commit-Paths: head/sys/dev/mlx4/mlx4_en X-SVN-Commit-Revision: 341552 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 3B10A7139B X-Spamd-Result: default: False [-0.69 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-0.54)[-0.543,0]; NEURAL_HAM_SHORT(-0.08)[-0.077,0]; NEURAL_HAM_LONG(-0.07)[-0.072,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Dec 2018 13:39:36 -0000 Author: slavash Date: Wed Dec 5 13:39:35 2018 New Revision: 341552 URL: https://svnweb.freebsd.org/changeset/base/341552 Log: mlx4en: Optimise reception of small packets. Copy small packets like TCP ACKs into a new mbuf reusing the existing mbuf to receive a new ethernet frame. This avoids wasting buffer space for small sized packets. Submitted by: hselasky@ Approved by: hselasky (mentor) MFC after: 1 week Sponsored by: Mellanox Technologies Modified: head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c Modified: head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c ============================================================================== --- head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c Wed Dec 5 13:39:05 2018 (r341551) +++ head/sys/dev/mlx4/mlx4_en/mlx4_en_rx.c Wed Dec 5 13:39:35 2018 (r341552) @@ -629,6 +629,24 @@ mlx4_en_rx_mb(struct mlx4_en_priv *priv, struct mlx4_e #endif struct mbuf *mb; + /* optimise reception of small packets */ + if (length <= (MHLEN - MLX4_NET_IP_ALIGN) && + (mb = m_gethdr(M_NOWAIT, MT_DATA)) != NULL) { + + /* set packet length */ + mb->m_pkthdr.len = mb->m_len = length; + + /* make sure IP header gets aligned */ + mb->m_data += MLX4_NET_IP_ALIGN; + + bus_dmamap_sync(ring->dma_tag, mb_list->dma_map, + BUS_DMASYNC_POSTREAD); + + bcopy(mtod(mb_list->mbuf, caddr_t), mtod(mb, caddr_t), length); + + return (mb); + } + /* get mbuf */ mb = mb_list->mbuf;