linux-kernel - [PATCH net-next 1/3] net: qede: use return from qede_parse_actions() for flow

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Date: Fri,  3 May 2024 10:55:01 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: netdev@...r.kernel.org
Cc: Asbjørn Sloth Tønnesen <ast@...erby.net>,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Manish Chopra <manishc@...vell.com>
Subject: [PATCH net-next 1/3] net: qede: use return from qede_parse_actions() for flow_spec

In qede_flow_spec_to_rule(), when calling
qede_parse_actions() then the return code
was only used for a non-zero check, and then
-EINVAL was returned.

qede_parse_actions() can currently fail with:
* -EINVAL
* -EOPNOTSUPP

Commit 319a1d19471e ("flow_offload: check for
basic action hw stats type") broke the implicit
assumption that it could only fail with -EINVAL,
by changing it to return -EOPNOTSUPP, when hardware
stats are requested.

However AFAICT it's not possible to trigger
qede_parse_actions() to return -EOPNOTSUPP, when
called from qede_flow_spec_to_rule(), as hardware
stats can't be requested by ethtool_rx_flow_rule_create().

This patch changes qede_flow_spec_to_rule() to use
the actual return code from qede_parse_actions(),
so it's no longer assumed that all errors are -EINVAL.

Only compile tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@...erby.net>
---
 drivers/net/ethernet/qlogic/qede/qede_filter.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qede/qede_filter.c b/drivers/net/ethernet/qlogic/qede/qede_filter.c
index cb6b33a228ea..d5ca4bf6dba5 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_filter.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_filter.c
@@ -1943,6 +1943,8 @@ static int qede_flow_spec_validate(struct qede_dev *edev,
 				   struct qede_arfs_tuple *t,
 				   __u32 location)
 {
+	int err;
+
 	if (location >= QEDE_RFS_MAX_FLTR) {
 		DP_INFO(edev, "Location out-of-bounds\n");
 		return -EINVAL;
@@ -1963,8 +1965,9 @@ static int qede_flow_spec_validate(struct qede_dev *edev,
 		return -EINVAL;
 	}
 
-	if (qede_parse_actions(edev, flow_action, NULL))
-		return -EINVAL;
+	err = qede_parse_actions(edev, flow_action, NULL);
+	if (err)
+		return err;
 
 	return 0;
 }
-- 
2.43.0