Author: hselasky
Date: Thu Aug 3 14:09:36 2017
New Revision: 322005
URL: https://svnweb.freebsd.org/changeset/base/322005
Log:
MFC r312865:
Enforce reading the consumer and producer counters once to ensure
consistent return values from the mlx5e_sq_has_room_for()
function. The two counters are incremented by different threads under
different locks.
Sponsored by: Mellanox Technologies
Modified:
stable/10/sys/dev/mlx5/mlx5_en/en.h
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/mlx5/mlx5_en/en.h
==============================================================================
--- stable/10/sys/dev/mlx5/mlx5_en/en.h Thu Aug 3 14:08:39 2017
(r322004)
+++ stable/10/sys/dev/mlx5/mlx5_en/en.h Thu Aug 3 14:09:36 2017
(r322005)
@@ -556,8 +556,10 @@ struct mlx5e_sq {
static inline bool
mlx5e_sq_has_room_for(struct mlx5e_sq *sq, u16 n)
{
- return ((sq->wq.sz_m1 & (sq->cc - sq->pc)) >= n ||
- sq->cc == sq->pc);
+ u16 cc = sq->cc;
+ u16 pc = sq->pc;
+
+ return ((sq->wq.sz_m1 & (cc - pc)) >= n || cc == pc);
}
struct mlx5e_channel {
_______________________________________________
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"
