netdev - [PATCH net-next] net/sched: cls_flower: Set the filter Hardware device for all use-cases

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Message-Id: <1480857919-25194-1-git-send-email-hadarh@mellanox.com>
Date:   Sun,  4 Dec 2016 15:25:19 +0200
From:   Hadar Hen Zion <hadarh@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Simon Horman <horms@...ge.net.au>,
        Jiri Pirko <jiri@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Hadar Hen Zion <hadarh@...lanox.com>
Subject: [PATCH net-next] net/sched: cls_flower: Set the filter Hardware device for all use-cases

Check if the returned device from tcf_exts_get_dev function supports tc
offload and in case the rule can't be offloaded, set the filter hw_dev
parameter to the original device given by the user.

The filter hw_device parameter should always be set by fl_hw_replace_filter
function, since this pointer is used by dump stats and destroy
filter for each flower rule (offloaded or not).

Fixes: 7091d8c7055d ('net/sched: cls_flower: Add offload support using egress Hardware device')
Signed-off-by: Hadar Hen Zion <hadarh@...lanox.com>
Reported-by: Simon Horman <horms@...ge.net.au>
---
 net/sched/cls_flower.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index c5cea78..29a9e6d 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -236,8 +236,11 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
 	int err;
 
 	if (!tc_can_offload(dev, tp)) {
-		if (tcf_exts_get_dev(dev, &f->exts, &f->hw_dev))
+		if (tcf_exts_get_dev(dev, &f->exts, &f->hw_dev) ||
+		    (f->hw_dev && !tc_can_offload(f->hw_dev, tp))) {
+			f->hw_dev = dev;
 			return tc_skip_sw(f->flags) ? -EINVAL : 0;
+		}
 		dev = f->hw_dev;
 		tc->egress_dev = true;
 	} else {
-- 
1.8.3.1