netdev - [PATCH net-next 2/5] net: microchip: sparx5: Add support to check for existing VCAP rule id

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Date:   Tue, 17 Jan 2023 09:55:41 +0100
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     Steen Hegelund <steen.hegelund@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Casper Andersson" <casper.casan@...il.com>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Wan Jiabing <wanjiabing@...o.com>,
        "Nathan Huckleberry" <nhuck@...gle.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Steen Hegelund" <Steen.Hegelund@...rochip.com>,
        Daniel Machon <daniel.machon@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Dan Carpenter <error27@...il.com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH net-next 2/5] net: microchip: sparx5: Add support to check for existing VCAP rule id

Add a new function that just checks if the VCAP rule id is already used by
an existing rule.

Signed-off-by: Steen Hegelund <steen.hegelund@...rochip.com>
---
 drivers/net/ethernet/microchip/vcap/vcap_api.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/ethernet/microchip/vcap/vcap_api.c
index 4e038f96a131..f1dc4fd6bb96 100644
--- a/drivers/net/ethernet/microchip/vcap/vcap_api.c
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c
@@ -920,6 +920,20 @@ int vcap_set_rule_set_actionset(struct vcap_rule *rule,
 }
 EXPORT_SYMBOL_GPL(vcap_set_rule_set_actionset);
 
+/* Check if a rule with this id exists */
+static bool vcap_rule_exists(struct vcap_control *vctrl, u32 id)
+{
+	struct vcap_rule_internal *ri;
+	struct vcap_admin *admin;
+
+	/* Look for the rule id in all vcaps */
+	list_for_each_entry(admin, &vctrl->list, list)
+		list_for_each_entry(ri, &admin->rules, list)
+			if (ri->data.id == id)
+				return true;
+	return false;
+}
+
 /* Find a rule with a provided rule id */
 static struct vcap_rule_internal *vcap_lookup_rule(struct vcap_control *vctrl,
 						   u32 id)
@@ -1866,7 +1880,7 @@ static u32 vcap_set_rule_id(struct vcap_rule_internal *ri)
 		return ri->data.id;
 
 	for (u32 next_id = 1; next_id < ~0; ++next_id) {
-		if (!vcap_lookup_rule(ri->vctrl, next_id)) {
+		if (!vcap_rule_exists(ri->vctrl, next_id)) {
 			ri->data.id = next_id;
 			break;
 		}
@@ -2103,7 +2117,7 @@ struct vcap_rule *vcap_alloc_rule(struct vcap_control *vctrl,
 	if (vctrl->vcaps[admin->vtype].rows == 0)
 		return ERR_PTR(-EINVAL);
 	/* Check if a rule with this id already exists */
-	if (vcap_lookup_rule(vctrl, id))
+	if (vcap_rule_exists(vctrl, id))
 		return ERR_PTR(-EEXIST);
 	/* Check if there is room for the rule in the block(s) of the VCAP */
 	maxsize = vctrl->vcaps[admin->vtype].sw_count; /* worst case rule size */
-- 
2.39.0