From owner-svn-src-all@freebsd.org Fri Nov 9 22:18:44 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 6733F1109E7B; Fri, 9 Nov 2018 22:18:44 +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 E8C7A6A2D9; Fri, 9 Nov 2018 22:18:43 +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 BD91719F04; Fri, 9 Nov 2018 22:18:43 +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 wA9MIhLQ050986; Fri, 9 Nov 2018 22:18:43 GMT (envelope-from shurd@FreeBSD.org) Received: (from shurd@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wA9MIh2c050984; Fri, 9 Nov 2018 22:18:43 GMT (envelope-from shurd@FreeBSD.org) Message-Id: <201811092218.wA9MIh2c050984@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: shurd set sender to shurd@FreeBSD.org using -f From: Stephen Hurd Date: Fri, 9 Nov 2018 22:18:43 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340310 - head/sys/dev/e1000 X-SVN-Group: head X-SVN-Commit-Author: shurd X-SVN-Commit-Paths: head/sys/dev/e1000 X-SVN-Commit-Revision: 340310 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: E8C7A6A2D9 X-Spamd-Result: default: False [-106.87 / 200.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; ALLOW_DOMAIN_WHITELIST(-100.00)[FreeBSD.org]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; HAS_XAW(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all]; DMARC_NA(0.00)[FreeBSD.org]; RCVD_COUNT_THREE(0.00)[4]; MX_GOOD(-0.01)[cached: mx1.FreeBSD.org]; NEURAL_HAM_SHORT(-1.00)[-0.998,0]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; IP_SCORE(-3.76)[ip: (-9.91), ipnet: 2610:1c1:1::/48(-4.93), asn: 11403(-3.87), country: US(-0.09)] 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: Fri, 09 Nov 2018 22:18:44 -0000 Author: shurd Date: Fri Nov 9 22:18:43 2018 New Revision: 340310 URL: https://svnweb.freebsd.org/changeset/base/340310 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. PR: 233022 Reported by: lev Reviewed by: lev MFC after: 3 days Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D17931 Modified: head/sys/dev/e1000/em_txrx.c head/sys/dev/e1000/igb_txrx.c Modified: head/sys/dev/e1000/em_txrx.c ============================================================================== --- head/sys/dev/e1000/em_txrx.c Fri Nov 9 21:45:42 2018 (r340309) +++ head/sys/dev/e1000/em_txrx.c Fri Nov 9 22:18:43 2018 (r340310) @@ -458,7 +458,13 @@ em_isc_txd_credits_update(void *arg, uint16_t txqid, b 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; DPRINTF(iflib_get_dev(adapter->ctx), Modified: head/sys/dev/e1000/igb_txrx.c ============================================================================== --- head/sys/dev/e1000/igb_txrx.c Fri Nov 9 21:45:42 2018 (r340309) +++ head/sys/dev/e1000/igb_txrx.c Fri Nov 9 22:18:43 2018 (r340310) @@ -333,7 +333,13 @@ igb_isc_txd_credits_update(void *arg, uint16_t txqid, 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;