From owner-svn-src-all@freebsd.org Thu Sep 10 21:41:12 2015 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 52B8BA02364; Thu, 10 Sep 2015 21:41:12 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org (repo.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 4194A1BF1; Thu, 10 Sep 2015 21:41:12 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.70]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id t8ALfCFb010510; Thu, 10 Sep 2015 21:41:12 GMT (envelope-from jhb@FreeBSD.org) Received: (from jhb@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id t8ALfC82010509; Thu, 10 Sep 2015 21:41:12 GMT (envelope-from jhb@FreeBSD.org) Message-Id: <201509102141.t8ALfC82010509@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jhb set sender to jhb@FreeBSD.org using -f From: John Baldwin Date: Thu, 10 Sep 2015 21:41:12 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r287631 - head/sys/dev/cxgbe/tom X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.20 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: Thu, 10 Sep 2015 21:41:12 -0000 Author: jhb Date: Thu Sep 10 21:41:11 2015 New Revision: 287631 URL: https://svnweb.freebsd.org/changeset/base/287631 Log: Add a comment that to clarify how to determine the amount of received DDP data. Reviewed by: np Differential Revision: https://reviews.freebsd.org/D3619 Modified: head/sys/dev/cxgbe/tom/t4_ddp.c Modified: head/sys/dev/cxgbe/tom/t4_ddp.c ============================================================================== --- head/sys/dev/cxgbe/tom/t4_ddp.c Thu Sep 10 21:08:54 2015 (r287630) +++ head/sys/dev/cxgbe/tom/t4_ddp.c Thu Sep 10 21:41:11 2015 (r287631) @@ -405,6 +405,19 @@ handle_ddp_data(struct toepcb *toep, __b } tp = intotcpcb(inp); + + /* + * For RX_DDP_COMPLETE, len will be zero and rcv_nxt is the + * sequence number of the next byte to receive. The length of + * the data received for this message must be computed by + * comparing the new and old values of rcv_nxt. + * + * For RX_DATA_DDP, len might be non-zero, but it is only the + * length of the most recent DMA. It does not include the + * total length of the data received since the previous update + * for this DDP buffer. rcv_nxt is the sequence number of the + * first received byte from the most recent DMA. + */ len += be32toh(rcv_nxt) - tp->rcv_nxt; tp->rcv_nxt += len; tp->t_rcvtime = ticks;