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Message-Id: <20180729083500.5352-11-leon@kernel.org>
Date: Sun, 29 Jul 2018 11:35:00 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Doug Ledford <dledford@...hat.com>,
Jason Gunthorpe <jgg@...lanox.com>
Cc: Leon Romanovsky <leonro@...lanox.com>,
RDMA mailing list <linux-rdma@...r.kernel.org>,
Denis Drozdov <denisd@...lanox.com>,
Erez Shitrit <erezsh@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>,
linux-netdev <netdev@...r.kernel.org>
Subject: [PATCH rdma-next 10/10] IB/ipoib: Consolidate checking of the proposed child interface
From: Jason Gunthorpe <jgg@...lanox.com>
Move all the checking for pkey and other validity to the __ipoib_vlan_add
function. This removes the last difference from the control flow
of the __ipoib_vlan_add to make the overall design simpler to
understand.
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Erez Shitrit <erezsh@...lanox.com>
Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
---
drivers/infiniband/ulp/ipoib/ipoib_netlink.c | 3 --
drivers/infiniband/ulp/ipoib/ipoib_vlan.c | 77 +++++++++++++++++++---------
2 files changed, 52 insertions(+), 28 deletions(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
index 7e093b7aad8f..d4d553a51fa9 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
@@ -122,9 +122,6 @@ static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
} else
child_pkey = nla_get_u16(data[IFLA_IPOIB_PKEY]);
- if (child_pkey == 0 || child_pkey == 0x8000)
- return -EINVAL;
-
err = __ipoib_vlan_add(ppriv, ipoib_priv(dev),
child_pkey, IPOIB_RTNL_CHILD);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index ca3a7f6c0998..341753fbda54 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -50,6 +50,39 @@ static ssize_t show_parent(struct device *d, struct device_attribute *attr,
}
static DEVICE_ATTR(parent, S_IRUGO, show_parent, NULL);
+static bool is_child_unique(struct ipoib_dev_priv *ppriv,
+ struct ipoib_dev_priv *priv)
+{
+ struct ipoib_dev_priv *tpriv;
+
+ ASSERT_RTNL();
+
+ /*
+ * Since the legacy sysfs interface uses pkey for deletion it cannot
+ * support more than one interface with the same pkey, it creates
+ * ambiguity. The RTNL interface deletes using the netdev so it does
+ * not have a problem to support duplicated pkeys.
+ */
+ if (priv->child_type != IPOIB_LEGACY_CHILD)
+ return true;
+
+ /*
+ * First ensure this isn't a duplicate. We check the parent device and
+ * then all of the legacy child interfaces to make sure the Pkey
+ * doesn't match.
+ */
+ if (ppriv->pkey == priv->pkey)
+ return false;
+
+ list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
+ if (tpriv->pkey == priv->pkey &&
+ tpriv->child_type == IPOIB_LEGACY_CHILD)
+ return false;
+ }
+
+ return true;
+}
+
/*
* NOTE: If this function fails then the priv->dev will remain valid, however
* priv can have been freed and must not be touched by caller in the error
@@ -73,10 +106,20 @@ int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
*/
WARN_ON(ppriv->dev->reg_state != NETREG_REGISTERED);
+ if (pkey == 0 || pkey == 0x8000) {
+ result = -EINVAL;
+ goto out_early;
+ }
+
priv->parent = ppriv->dev;
priv->pkey = pkey;
priv->child_type = type;
+ if (!is_child_unique(ppriv, priv)) {
+ result = -ENOTUNIQ;
+ goto out_early;
+ }
+
/* We do not need to touch priv if register_netdevice fails */
ndev->priv_destructor = ipoib_intf_free;
@@ -88,9 +131,7 @@ int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
* register_netdevice sometimes calls priv_destructor,
* sometimes not. Make sure it was done.
*/
- if (ndev->priv_destructor)
- ndev->priv_destructor(ndev);
- return result;
+ goto out_early;
}
/* RTNL childs don't need proprietary sysfs entries */
@@ -111,6 +152,11 @@ int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
sysfs_failed:
unregister_netdevice(priv->dev);
return -ENOMEM;
+
+out_early:
+ if (ndev->priv_destructor)
+ ndev->priv_destructor(ndev);
+ return result;
}
int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
@@ -118,17 +164,11 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
struct ipoib_dev_priv *ppriv, *priv;
char intf_name[IFNAMSIZ];
struct net_device *ndev;
- struct ipoib_dev_priv *tpriv;
int result;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
- ppriv = ipoib_priv(pdev);
-
- snprintf(intf_name, sizeof(intf_name), "%s.%04x",
- ppriv->dev->name, pkey);
-
if (!rtnl_trylock())
return restart_syscall();
@@ -137,23 +177,10 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
return -EPERM;
}
- /*
- * First ensure this isn't a duplicate. We check the parent device and
- * then all of the legacy child interfaces to make sure the Pkey
- * doesn't match.
- */
- if (ppriv->pkey == pkey) {
- result = -ENOTUNIQ;
- goto out;
- }
+ ppriv = ipoib_priv(pdev);
- list_for_each_entry(tpriv, &ppriv->child_intfs, list) {
- if (tpriv->pkey == pkey &&
- tpriv->child_type == IPOIB_LEGACY_CHILD) {
- result = -ENOTUNIQ;
- goto out;
- }
- }
+ snprintf(intf_name, sizeof(intf_name), "%s.%04x",
+ ppriv->dev->name, pkey);
priv = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
if (!priv) {
--
2.14.4
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