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Fix first-packet completion

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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
This commit is contained in:
Stephen Hurd 2018-11-28 17:37:17 +00:00
parent 8f69e36d87
commit e8e0ecb969
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=341156
2 changed files with 8 additions and 0 deletions
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2
sys/dev/ixgbe/ix_txrx.c
View File

@ -297,6 +297,8 @@ ixgbe_isc_txd_credits_update(void *arg, uint16_t txqid, bool clear)
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;

6
sys/dev/ixl/ixl_txrx.c
View File

@ -516,7 +516,13 @@ ixl_isc_txd_credits_update_dwb(void *arg, uint16_t txqid, bool clear)
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