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 _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
