From owner-svn-src-all@freebsd.org Wed Mar 29 15:34:53 2017 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 CFF31D23F28; Wed, 29 Mar 2017 15:34:53 +0000 (UTC) (envelope-from royger@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 791D1130E; Wed, 29 Mar 2017 15:34:53 +0000 (UTC) (envelope-from royger@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v2TFYqPj041848; Wed, 29 Mar 2017 15:34:52 GMT (envelope-from royger@FreeBSD.org) Received: (from royger@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v2TFYq2j041847; Wed, 29 Mar 2017 15:34:52 GMT (envelope-from royger@FreeBSD.org) Message-Id: <201703291534.v2TFYq2j041847@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: royger set sender to royger@FreeBSD.org using -f From: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= Date: Wed, 29 Mar 2017 15:34:52 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r316140 - stable/10/sys/dev/xen/netfront X-SVN-Group: stable-10 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: 2.1.23 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, 29 Mar 2017 15:34:53 -0000 Author: royger Date: Wed Mar 29 15:34:52 2017 New Revision: 316140 URL: https://svnweb.freebsd.org/changeset/base/316140 Log: xen/netfront: release resources on removal Current netfront code doesn't release the resources (grants and mbufs) on removal. Add a new helper that releases the resources, so FreeBSD doesn't run out of grants or memory when performing heavy hotplug/unplug of Xen PV nic devices. This is a direct commit to stable/10 because the code in newer branches has been completely refactored and no longer has this issue. Reviewed by: royger Submitted by: Ouyangzhaowei Differential review: https://reviews.freebsd.org/D10088 Modified: stable/10/sys/dev/xen/netfront/netfront.c Modified: stable/10/sys/dev/xen/netfront/netfront.c ============================================================================== --- stable/10/sys/dev/xen/netfront/netfront.c Wed Mar 29 15:25:34 2017 (r316139) +++ stable/10/sys/dev/xen/netfront/netfront.c Wed Mar 29 15:34:52 2017 (r316140) @@ -805,6 +805,45 @@ netif_release_tx_bufs(struct netfront_in } static void +netif_release_rx_bufs_copy(struct netfront_info *np) +{ + struct mbuf *m; + grant_ref_t ref; + unsigned int i, busy, inuse; + + XN_RX_LOCK(np); + + for (busy = inuse = i = 0; i < NET_RX_RING_SIZE; i++) { + ref = np->grant_rx_ref[i]; + + if (ref == GRANT_REF_INVALID) + continue; + + inuse++; + + m = np->rx_mbufs[i]; + + if (!gnttab_end_foreign_access_ref(ref)) { + busy++; + continue; + } + + gnttab_release_grant_reference(&np->gref_rx_head, ref); + np->grant_rx_ref[i] = GRANT_REF_INVALID; + add_id_to_freelist(np->rx_mbufs, i); + + m_freem(m); + } + + if (busy != 0) + device_printf(np->xbdev, + "Unable to release %u of %u in use grant references out of %ld total.\n", + busy, inuse, NET_RX_RING_SIZE); + + XN_RX_UNLOCK(np); +} + +static void network_alloc_rx_buffers(struct netfront_info *sc) { int otherend_id = xenbus_get_otherend_id(sc->xbdev); @@ -2199,6 +2238,12 @@ netif_free(struct netfront_info *info) info->xn_ifp = NULL; } ifmedia_removeall(&info->sc_media); + netif_release_tx_bufs(info); + if (info->copying_receiver) + netif_release_rx_bufs_copy(info); + + gnttab_free_grant_references(info->gref_tx_head); + gnttab_free_grant_references(info->gref_rx_head); } static void