From owner-svn-src-stable-12@freebsd.org Mon Nov 12 16:28:09 2018 Return-Path: Delivered-To: svn-src-stable-12@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 2AD70110A45A; Mon, 12 Nov 2018 16:28:09 +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 A9C9675966; Mon, 12 Nov 2018 16:28:08 +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 8627D23273; Mon, 12 Nov 2018 16:28:08 +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 wACGS84V018639; Mon, 12 Nov 2018 16:28:08 GMT (envelope-from shurd@FreeBSD.org) Received: (from shurd@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wACGS8mn018638; Mon, 12 Nov 2018 16:28:08 GMT (envelope-from shurd@FreeBSD.org) Message-Id: <201811121628.wACGS8mn018638@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: shurd set sender to shurd@FreeBSD.org using -f From: Stephen Hurd Date: Mon, 12 Nov 2018 16:28:08 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r340366 - stable/12/sys/dev/e1000 X-SVN-Group: stable-12 X-SVN-Commit-Author: shurd X-SVN-Commit-Paths: stable/12/sys/dev/e1000 X-SVN-Commit-Revision: 340366 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: A9C9675966 X-Spamd-Result: default: False [-106.88 / 200.00]; ALLOW_DOMAIN_WHITELIST(-100.00)[FreeBSD.org]; TO_DN_NONE(0.00)[]; HAS_XAW(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all]; RCVD_COUNT_THREE(0.00)[4]; MX_GOOD(-0.01)[cached: mx1.FreeBSD.org]; NEURAL_HAM_SHORT(-1.00)[-0.999,0]; 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(-3.77)[ip: (-9.91), ipnet: 2610:1c1:1::/48(-4.93), asn: 11403(-3.90), country: US(-0.09)]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[FreeBSD.org] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Nov 2018 16:28:09 -0000 Author: shurd Date: Mon Nov 12 16:28:07 2018 New Revision: 340366 URL: https://svnweb.freebsd.org/changeset/base/340366 Log: MFC r340310: 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 Approved by: re (kib) Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D17931 Modified: stable/12/sys/dev/e1000/em_txrx.c stable/12/sys/dev/e1000/igb_txrx.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/dev/e1000/em_txrx.c ============================================================================== --- stable/12/sys/dev/e1000/em_txrx.c Mon Nov 12 16:08:14 2018 (r340365) +++ stable/12/sys/dev/e1000/em_txrx.c Mon Nov 12 16:28:07 2018 (r340366) @@ -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: stable/12/sys/dev/e1000/igb_txrx.c ============================================================================== --- stable/12/sys/dev/e1000/igb_txrx.c Mon Nov 12 16:08:14 2018 (r340365) +++ stable/12/sys/dev/e1000/igb_txrx.c Mon Nov 12 16:28:07 2018 (r340366) @@ -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;