linux-kernel - Re: [PATCH net-next v3 1/2] macsec: add support for IFLA_MACSEC_OFFLOAD in macsec

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Date:   Wed, 7 Dec 2022 16:35:29 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     ehakim@...dia.com
Cc:     linux-kernel@...r.kernel.org, raeds@...dia.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org, sd@...asysnail.net,
        atenart@...nel.org
Subject: Re: [PATCH net-next v3 1/2] macsec: add support for
 IFLA_MACSEC_OFFLOAD in macsec_changelink

Wed, Dec 07, 2022 at 11:10:16AM CET, ehakim@...dia.com wrote:
>From: Emeel Hakim <ehakim@...dia.com>
>
>Add support for changing Macsec offload selection through the
>netlink layer by implementing the relevant changes in
>macsec_change link.
>
>Since the handling in macsec_changelink is similar to macsec_upd_offload,
>update macsec_upd_offload to use a common helper function to avoid
>duplication.
>
>Example for setting offload for a macsec device:
>    ip link set macsec0 type macsec offload mac
>
>Reviewed-by: Raed Salem <raeds@...dia.com>
>Signed-off-by: Emeel Hakim <ehakim@...dia.com>
>---
>V2 -> V3: - Split the original patch into 3 patches, the macsec_rtnl_policy related change (separate patch)
>			to be sent to "net" branch as a fix.
>		  - Change the original patch title to make it clear that it's only adding IFLA_MACSEC_OFFLOAD
>		    to changelink
>V1 -> V2: Add common helper to avoid duplicating code 
>
> drivers/net/macsec.c | 102 +++++++++++++++++++++++++++----------------
> 1 file changed, 64 insertions(+), 38 deletions(-)
>
>diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
>index d73b9d535b7a..1850a1ee4380 100644
>--- a/drivers/net/macsec.c
>+++ b/drivers/net/macsec.c
>@@ -2583,16 +2583,45 @@ static bool macsec_is_configured(struct macsec_dev *macsec)
> 	return false;
> }
> 
>+static int macsec_update_offload(struct macsec_dev *macsec, enum macsec_offload offload)
>+{
>+	enum macsec_offload prev_offload;
>+	const struct macsec_ops *ops;
>+	struct macsec_context ctx;
>+	int ret = 0;
>+
>+	prev_offload = macsec->offload;
>+
>+	/* Check if the device already has rules configured: we do not support
>+	 * rules migration.
>+	 */
>+	if (macsec_is_configured(macsec))
>+		return -EBUSY;
>+
>+	ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
>+			       macsec, &ctx);
>+	if (!ops)
>+		return -EOPNOTSUPP;
>+
>+	macsec->offload = offload;
>+
>+	ctx.secy = &macsec->secy;
>+	ret = (offload == MACSEC_OFFLOAD_OFF) ? macsec_offload(ops->mdo_del_secy, &ctx) :
>+		      macsec_offload(ops->mdo_add_secy, &ctx);
>+
>+	if (ret)
>+		macsec->offload = prev_offload;
>+
>+	return ret;
>+}
>+
> static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
> {
> 	struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
>-	enum macsec_offload offload, prev_offload;
>-	int (*func)(struct macsec_context *ctx);
> 	struct nlattr **attrs = info->attrs;
>-	struct net_device *dev;
>-	const struct macsec_ops *ops;
>-	struct macsec_context ctx;
>+	enum macsec_offload offload;
> 	struct macsec_dev *macsec;
>+	struct net_device *dev;
> 	int ret;
> 
> 	if (!attrs[MACSEC_ATTR_IFINDEX])
>@@ -2629,39 +2658,7 @@ static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
> 
> 	rtnl_lock();
> 
>-	prev_offload = macsec->offload;
>-	macsec->offload = offload;
>-
>-	/* Check if the device already has rules configured: we do not support
>-	 * rules migration.
>-	 */
>-	if (macsec_is_configured(macsec)) {
>-		ret = -EBUSY;
>-		goto rollback;
>-	}
>-
>-	ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
>-			       macsec, &ctx);
>-	if (!ops) {
>-		ret = -EOPNOTSUPP;
>-		goto rollback;
>-	}
>-
>-	if (prev_offload == MACSEC_OFFLOAD_OFF)
>-		func = ops->mdo_add_secy;
>-	else
>-		func = ops->mdo_del_secy;
>-
>-	ctx.secy = &macsec->secy;
>-	ret = macsec_offload(func, &ctx);
>-	if (ret)
>-		goto rollback;
>-
>-	rtnl_unlock();
>-	return 0;
>-
>-rollback:
>-	macsec->offload = prev_offload;
>+	ret = macsec_update_offload(macsec, offload);
> 
> 	rtnl_unlock();
> 	return ret;
>@@ -3803,6 +3800,29 @@ static int macsec_changelink_common(struct net_device *dev,
> 	return 0;
> }
> 
>+static int macsec_changelink_upd_offload(struct net_device *dev, struct nlattr *data[])

Only data[IFLA_MACSEC_OFFLOAD] is used there. Pass just this attr.


>+{
>+	enum macsec_offload offload;
>+	struct macsec_dev *macsec;
>+
>+	macsec = macsec_priv(dev);
>+	offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
>+
>+	if (macsec->offload == offload)
>+		return 0;
>+
>+	/* Check if the offloading mode is supported by the underlying layers */
>+	if (offload != MACSEC_OFFLOAD_OFF &&
>+	    !macsec_check_offload(offload, macsec))
>+		return -EOPNOTSUPP;
>+
>+	/* Check if the net device is busy. */
>+	if (netif_running(dev))
>+		return -EBUSY;
>+
>+	return macsec_update_offload(macsec, offload);
>+}
>+
> static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
> 			     struct nlattr *data[],
> 			     struct netlink_ext_ack *extack)
>@@ -3831,6 +3851,12 @@ static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
> 	if (ret)
> 		goto cleanup;
> 
>+	if (data[IFLA_MACSEC_OFFLOAD]) {
>+		ret = macsec_changelink_upd_offload(dev, data);
>+		if (ret)
>+			goto cleanup;
>+	}
>+
> 	/* If h/w offloading is available, propagate to the device */
> 	if (macsec_is_offloaded(macsec)) {
> 		const struct macsec_ops *ops;
>-- 
>2.21.3
>