Date: Mon, 3 Dec 2018 15:18:35 +0000 (UTC) From: Stephen Hurd <shurd@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r341427 - in stable/12/sys/dev: ixgbe ixl Message-ID: <201812031518.wB3FIZXh030806@repo.freebsd.org>
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Author: shurd Date: Mon Dec 3 15:18:35 2018 New Revision: 341427 URL: https://svnweb.freebsd.org/changeset/base/341427 Log: MFC r341156: 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 Sponsored by: Limelight Networks Differential Revision: https://reviews.freebsd.org/D18368 Modified: stable/12/sys/dev/ixgbe/ix_txrx.c stable/12/sys/dev/ixl/ixl_txrx.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/dev/ixgbe/ix_txrx.c ============================================================================== --- stable/12/sys/dev/ixgbe/ix_txrx.c Mon Dec 3 15:14:40 2018 (r341426) +++ stable/12/sys/dev/ixgbe/ix_txrx.c Mon Dec 3 15:18:35 2018 (r341427) @@ -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: stable/12/sys/dev/ixl/ixl_txrx.c ============================================================================== --- stable/12/sys/dev/ixl/ixl_txrx.c Mon Dec 3 15:14:40 2018 (r341426) +++ stable/12/sys/dev/ixl/ixl_txrx.c Mon Dec 3 15:18:35 2018 (r341427) @@ -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
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