From owner-svn-src-all@freebsd.org Wed Nov 28 17:37:19 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 082B41137603; Wed, 28 Nov 2018 17:37:19 +0000 (UTC) (envelope-from shurd@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 A1F577E59D; Wed, 28 Nov 2018 17:37:18 +0000 (UTC) (envelope-from shurd@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 830F059DE; Wed, 28 Nov 2018 17:37:18 +0000 (UTC) (envelope-from shurd@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wASHbIax015132; Wed, 28 Nov 2018 17:37:18 GMT (envelope-from shurd@FreeBSD.org) Received: (from shurd@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wASHbIOQ015130; Wed, 28 Nov 2018 17:37:18 GMT (envelope-from shurd@FreeBSD.org) Message-Id: <201811281737.wASHbIOQ015130@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: shurd set sender to shurd@FreeBSD.org using -f From: Stephen Hurd Date: Wed, 28 Nov 2018 17:37:18 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r341156 - in head/sys/dev: ixgbe ixl X-SVN-Group: head X-SVN-Commit-Author: shurd X-SVN-Commit-Paths: in head/sys/dev: ixgbe ixl X-SVN-Commit-Revision: 341156 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: A1F577E59D X-Spamd-Result: default: False [1.13 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_SPAM_LONG(0.47)[0.465,0]; NEURAL_SPAM_SHORT(0.42)[0.421,0]; NEURAL_SPAM_MEDIUM(0.25)[0.247,0]; 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, 28 Nov 2018 17:37:19 -0000 Author: shurd Date: Wed Nov 28 17:37:17 2018 New Revision: 341156 URL: https://svnweb.freebsd.org/changeset/base/341156 Log: Fix first-packet completion The first packet after the ring is initialized was never completed as isc_txd_credits_update() would not include it in the count of completed packets. This caused netmap to never complete a batch. See PR 233022 for more details. This is the same fix as the r340310 for e1000 PR: 233607 Reported by: lev Reviewed by: lev MFC after: 3 days Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D18368 Modified: head/sys/dev/ixgbe/ix_txrx.c head/sys/dev/ixl/ixl_txrx.c Modified: head/sys/dev/ixgbe/ix_txrx.c ============================================================================== --- head/sys/dev/ixgbe/ix_txrx.c Wed Nov 28 17:31:34 2018 (r341155) +++ head/sys/dev/ixgbe/ix_txrx.c Wed Nov 28 17:37:17 2018 (r341156) @@ -297,6 +297,8 @@ ixgbe_isc_txd_credits_update(void *arg, uint16_t txqid ntxd = scctx->isc_ntxd[0]; do { delta = (int32_t)cur - (int32_t)prev; + if (prev == 0 && cur == 0) + delta += 1; if (delta < 0) delta += ntxd; Modified: head/sys/dev/ixl/ixl_txrx.c ============================================================================== --- head/sys/dev/ixl/ixl_txrx.c Wed Nov 28 17:31:34 2018 (r341155) +++ head/sys/dev/ixl/ixl_txrx.c Wed Nov 28 17:37:17 2018 (r341156) @@ -516,7 +516,13 @@ ixl_isc_txd_credits_update_dwb(void *arg, uint16_t txq ntxd = scctx->isc_ntxd[0]; do { delta = (int32_t)cur - (int32_t)prev; + /* + * XXX This appears to be a hack for first-packet. + * A correct fix would prevent prev == cur in the first place. + */ MPASS(prev == 0 || delta != 0); + if (prev == 0 && cur == 0) + delta += 1; if (delta < 0) delta += ntxd; #if 0