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Message-ID: <20230105080442.17873-2-ehakim@nvidia.com>
Date: Thu, 5 Jan 2023 10:04:41 +0200
From: <ehakim@...dia.com>
To: <netdev@...r.kernel.org>
CC: <raeds@...dia.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
<kuba@...nel.org>, <pabeni@...hat.com>, <sd@...asysnail.net>,
<atenart@...nel.org>, Emeel Hakim <ehakim@...dia.com>
Subject: [PATCH net-next v6 1/2] macsec: add support for IFLA_MACSEC_OFFLOAD in macsec_changelink
From: Emeel Hakim <ehakim@...dia.com>
Add support for changing Macsec offload selection through the
netlink layer by implementing the relevant changes in
macsec_changelink.
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>
---
v5 -> v6: - Locking issue got fixed in a separate patch so rebase
V4 -> V5: - Fail immediately if macsec ops does not exist
V3 -> V4: - Dont pass whole attributes data to macsec_update_offload, just pass relevant attribute.
- Fix code style.
- Remove macsec_changelink_upd_offload
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 | 116 +++++++++++++++++++++----------------------
1 file changed, 57 insertions(+), 59 deletions(-)
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index bf8ac7a3ded7..1974c59977aa 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -2583,95 +2583,87 @@ static bool macsec_is_configured(struct macsec_dev *macsec)
return false;
}
-static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
+static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
{
- 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;
+ enum macsec_offload prev_offload;
const struct macsec_ops *ops;
struct macsec_context ctx;
struct macsec_dev *macsec;
int ret = 0;
- if (!attrs[MACSEC_ATTR_IFINDEX])
- return -EINVAL;
-
- if (!attrs[MACSEC_ATTR_OFFLOAD])
- return -EINVAL;
-
- if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
- attrs[MACSEC_ATTR_OFFLOAD],
- macsec_genl_offload_policy, NULL))
- return -EINVAL;
-
- rtnl_lock();
-
- dev = get_dev_from_nl(genl_info_net(info), attrs);
- if (IS_ERR(dev)) {
- ret = PTR_ERR(dev);
- goto out;
- }
macsec = macsec_priv(dev);
- if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
- ret = -EINVAL;
- goto out;
- }
-
- offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
if (macsec->offload == offload)
- goto out;
+ return 0;
/* Check if the offloading mode is supported by the underlying layers */
if (offload != MACSEC_OFFLOAD_OFF &&
!macsec_check_offload(offload, macsec)) {
- ret = -EOPNOTSUPP;
- goto out;
+ return -EOPNOTSUPP;
}
/* Check if the net device is busy. */
- if (netif_running(dev)) {
- ret = -EBUSY;
- goto out;
- }
-
- prev_offload = macsec->offload;
- macsec->offload = offload;
+ if (netif_running(dev))
+ return -EBUSY;
/* Check if the device already has rules configured: we do not support
* rules migration.
*/
- if (macsec_is_configured(macsec)) {
- ret = -EBUSY;
- goto rollback;
- }
+ if (macsec_is_configured(macsec))
+ return -EBUSY;
+
+ prev_offload = macsec->offload;
ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
macsec, &ctx);
- if (!ops) {
- ret = -EOPNOTSUPP;
- goto rollback;
- }
+ if (!ops)
+ return -EOPNOTSUPP;
- if (prev_offload == MACSEC_OFFLOAD_OFF)
- func = ops->mdo_add_secy;
- else
- func = ops->mdo_del_secy;
+ macsec->offload = offload;
ctx.secy = &macsec->secy;
- ret = macsec_offload(func, &ctx);
+ ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
+ : macsec_offload(ops->mdo_add_secy, &ctx);
if (ret)
- goto rollback;
+ macsec->offload = prev_offload;
- rtnl_unlock();
- return 0;
+ return ret;
+}
+
+static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
+ struct nlattr **attrs = info->attrs;
+ enum macsec_offload offload;
+ struct net_device *dev;
+ int ret;
+
+ if (!attrs[MACSEC_ATTR_IFINDEX])
+ return -EINVAL;
+
+ if (!attrs[MACSEC_ATTR_OFFLOAD])
+ return -EINVAL;
+
+ if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
+ attrs[MACSEC_ATTR_OFFLOAD],
+ macsec_genl_offload_policy, NULL))
+ return -EINVAL;
+
+ dev = get_dev_from_nl(genl_info_net(info), attrs);
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+
+ if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
+ return -EINVAL;
+
+ offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
+
+ rtnl_lock();
+
+ ret = macsec_update_offload(dev, offload);
-rollback:
- macsec->offload = prev_offload;
-out:
rtnl_unlock();
+
return ret;
}
@@ -3840,6 +3832,12 @@ static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
if (ret)
goto cleanup;
+ if (data[IFLA_MACSEC_OFFLOAD]) {
+ ret = macsec_update_offload(dev, nla_get_u8(data[IFLA_MACSEC_OFFLOAD]));
+ 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
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