From owner-svn-src-head@freebsd.org Fri Nov 25 06:48:54 2016 Return-Path: Delivered-To: svn-src-head@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 A8A54C54590; Fri, 25 Nov 2016 06:48:54 +0000 (UTC) (envelope-from sephe@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 mx1.freebsd.org (Postfix) with ESMTPS id 5E4117D; Fri, 25 Nov 2016 06:48:54 +0000 (UTC) (envelope-from sephe@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id uAP6mreH071263; Fri, 25 Nov 2016 06:48:53 GMT (envelope-from sephe@FreeBSD.org) Received: (from sephe@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id uAP6mrPj071262; Fri, 25 Nov 2016 06:48:53 GMT (envelope-from sephe@FreeBSD.org) Message-Id: <201611250648.uAP6mrPj071262@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: sephe set sender to sephe@FreeBSD.org using -f From: Sepherosa Ziehau Date: Fri, 25 Nov 2016 06:48:53 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r309133 - head/sys/dev/hyperv/vmbus 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: 2.1.23 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: Fri, 25 Nov 2016 06:48:54 -0000 Author: sephe Date: Fri Nov 25 06:48:53 2016 New Revision: 309133 URL: https://svnweb.freebsd.org/changeset/base/309133 Log: hyperv/vmbus: GPADL disconnect error on a revoked channel is benign. MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D8567 Modified: head/sys/dev/hyperv/vmbus/vmbus_chan.c Modified: head/sys/dev/hyperv/vmbus/vmbus_chan.c ============================================================================== --- head/sys/dev/hyperv/vmbus/vmbus_chan.c Fri Nov 25 06:12:18 2016 (r309132) +++ head/sys/dev/hyperv/vmbus/vmbus_chan.c Fri Nov 25 06:48:53 2016 (r309133) @@ -66,6 +66,8 @@ static int vmbus_chan_release(struct v static void vmbus_chan_set_chmap(struct vmbus_channel *); static void vmbus_chan_clear_chmap(struct vmbus_channel *); static void vmbus_chan_detach(struct vmbus_channel *); +static bool vmbus_chan_wait_revoke( + const struct vmbus_channel *); static void vmbus_chan_ins_prilist(struct vmbus_softc *, struct vmbus_channel *); @@ -589,6 +591,24 @@ vmbus_chan_gpadl_connect(struct vmbus_ch return 0; } +static bool +vmbus_chan_wait_revoke(const struct vmbus_channel *chan) +{ +#define WAIT_COUNT 200 /* 200ms */ + + int i; + + for (i = 0; i < WAIT_COUNT; ++i) { + if (vmbus_chan_is_revoked(chan)) + return (true); + /* Not sure about the context; use busy-wait. */ + DELAY(1000); + } + return (false); + +#undef WAIT_COUNT +} + /* * Disconnect the GPA from the target channel */ @@ -605,7 +625,7 @@ vmbus_chan_gpadl_disconnect(struct vmbus vmbus_chan_printf(chan, "can not get msg hypercall for gpadl_disconn(chan%u)\n", chan->ch_id); - return EBUSY; + return (EBUSY); } req = vmbus_msghc_dataptr(mh); @@ -615,18 +635,29 @@ vmbus_chan_gpadl_disconnect(struct vmbus error = vmbus_msghc_exec(sc, mh); if (error) { + vmbus_msghc_put(sc, mh); + + if (vmbus_chan_wait_revoke(chan)) { + /* + * Error is benign; this channel is revoked, + * so this GPADL will not be touched anymore. + */ + vmbus_chan_printf(chan, + "gpadl_disconn(revoked chan%u) msg hypercall " + "exec failed: %d\n", chan->ch_id, error); + return (0); + } vmbus_chan_printf(chan, "gpadl_disconn(chan%u) msg hypercall exec failed: %d\n", chan->ch_id, error); - vmbus_msghc_put(sc, mh); - return error; + return (error); } vmbus_msghc_wait_result(sc, mh); /* Discard result; no useful information */ vmbus_msghc_put(sc, mh); - return 0; + return (0); } static void