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Message-ID: <522658eb90148cb670fb4f5db1429c41788aa4d8.1459807527.git.g.nault@alphalink.fr>
Date: Tue, 5 Apr 2016 02:56:29 +0200
From: Guillaume Nault <g.nault@...halink.fr>
To: netdev@...r.kernel.org
Cc: linux-ppp@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
David Miller <davem@...emloft.net>
Subject: [RFC PATCH 5/6] ppp: define reusable device creation functions
Move PPP device initialisation and registration out of
ppp_create_interface().
This prepares code for device registration with rtnetlink.
Signed-off-by: Guillaume Nault <g.nault@...halink.fr>
---
drivers/net/ppp/ppp_generic.c | 185 ++++++++++++++++++++++++------------------
1 file changed, 106 insertions(+), 79 deletions(-)
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 8aaedb8..516f8dc 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -183,6 +183,11 @@ struct channel {
#endif /* CONFIG_PPP_MULTILINK */
};
+struct ppp_config {
+ struct file *file;
+ s32 unit;
+};
+
/*
* SMP locking issues:
* Both the ppp.rlock and ppp.wlock locks protect the ppp.channels
@@ -984,6 +989,87 @@ static struct pernet_operations ppp_net_ops = {
.size = sizeof(struct ppp_net),
};
+static int ppp_unit_register(struct ppp *ppp, int unit)
+{
+ struct ppp_net *pn = ppp_pernet(ppp->ppp_net);
+ int ret;
+
+ mutex_lock(&pn->all_ppp_mutex);
+
+ if (unit < 0) {
+ ret = unit_get(&pn->units_idr, ppp);
+ if (ret < 0)
+ goto err;
+ } else {
+ /* Caller asked for a specific unit number. Fail with -EEXIST
+ * if unavailable. For backward compatibility, return -EEXIST
+ * too if idr allocation fails; this makes pppd retry without
+ * requesting a specific unit number.
+ */
+ if (unit_find(&pn->units_idr, unit)) {
+ ret = -EEXIST;
+ goto err;
+ }
+ ret = unit_set(&pn->units_idr, ppp, unit);
+ if (ret < 0) {
+ /* Rewrite error for backward compatibility */
+ ret = -EEXIST;
+ goto err;
+ }
+ }
+ ppp->file.index = ret;
+
+ snprintf(ppp->dev->name, IFNAMSIZ, "ppp%i", ppp->file.index);
+
+ ret = register_netdevice(ppp->dev);
+ if (ret < 0)
+ goto err_unit;
+
+ atomic_inc(&ppp_unit_count);
+
+ mutex_unlock(&pn->all_ppp_mutex);
+
+ return 0;
+
+err_unit:
+ unit_put(&pn->units_idr, ppp->file.index);
+err:
+ mutex_unlock(&pn->all_ppp_mutex);
+
+ return ret;
+}
+
+static int ppp_dev_configure(struct net *src_net, struct net_device *dev,
+ const struct ppp_config *conf)
+{
+ struct ppp *ppp = netdev_priv(dev);
+ int indx;
+
+ ppp->dev = dev;
+ ppp->mru = PPP_MRU;
+ ppp->ppp_net = src_net;
+ ppp->owner = conf->file;
+
+ init_ppp_file(&ppp->file, INTERFACE);
+ ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */
+
+ for (indx = 0; indx < NUM_NP; ++indx)
+ ppp->npmode[indx] = NPMODE_PASS;
+ INIT_LIST_HEAD(&ppp->channels);
+ spin_lock_init(&ppp->rlock);
+ spin_lock_init(&ppp->wlock);
+#ifdef CONFIG_PPP_MULTILINK
+ ppp->minseq = -1;
+ skb_queue_head_init(&ppp->mrq);
+#endif /* CONFIG_PPP_MULTILINK */
+#ifdef CONFIG_PPP_FILTER
+ ppp->pass_filter = NULL;
+ ppp->active_filter = NULL;
+#endif /* CONFIG_PPP_FILTER */
+
+ return ppp_unit_register(ppp, conf->unit);
+}
+
#define PPP_MAJOR 108
/* Called at boot time if ppp is compiled into the kernel,
@@ -2758,107 +2844,48 @@ ppp_get_stats(struct ppp *ppp, struct ppp_stats *st)
*/
static int ppp_create_interface(struct net *net, struct file *file, int *unit)
{
+ struct ppp_config conf = {
+ .file = file,
+ .unit = *unit,
+ };
+ struct net_device *dev;
struct ppp *ppp;
- struct ppp_net *pn;
- struct net_device *dev = NULL;
- int ret = -ENOMEM;
- int i;
+ int err;
dev = alloc_netdev(sizeof(struct ppp), "", NET_NAME_ENUM, ppp_setup);
- if (!dev)
- goto out1;
-
- pn = ppp_pernet(net);
-
- ppp = netdev_priv(dev);
- ppp->dev = dev;
- ppp->mru = PPP_MRU;
- init_ppp_file(&ppp->file, INTERFACE);
- ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */
- ppp->owner = file;
- for (i = 0; i < NUM_NP; ++i)
- ppp->npmode[i] = NPMODE_PASS;
- INIT_LIST_HEAD(&ppp->channels);
- spin_lock_init(&ppp->rlock);
- spin_lock_init(&ppp->wlock);
-#ifdef CONFIG_PPP_MULTILINK
- ppp->minseq = -1;
- skb_queue_head_init(&ppp->mrq);
-#endif /* CONFIG_PPP_MULTILINK */
-#ifdef CONFIG_PPP_FILTER
- ppp->pass_filter = NULL;
- ppp->active_filter = NULL;
-#endif /* CONFIG_PPP_FILTER */
+ if (!dev) {
+ err = -ENOMEM;
+ goto err;
+ }
- /*
- * drum roll: don't forget to set
- * the net device is belong to
- */
dev_net_set(dev, net);
rtnl_lock();
mutex_lock(&ppp_mutex);
- mutex_lock(&pn->all_ppp_mutex);
-
if (file->private_data) {
- ret = -ENOTTY;
- goto out2;
- }
-
- if (*unit < 0) {
- ret = unit_get(&pn->units_idr, ppp);
- if (ret < 0)
- goto out2;
- } else {
- ret = -EEXIST;
- if (unit_find(&pn->units_idr, *unit))
- goto out2; /* unit already exists */
- /*
- * if caller need a specified unit number
- * lets try to satisfy him, otherwise --
- * he should better ask us for new unit number
- *
- * NOTE: yes I know that returning EEXIST it's not
- * fair but at least pppd will ask us to allocate
- * new unit in this case so user is happy :)
- */
- ret = unit_set(&pn->units_idr, ppp, *unit);
- if (ret < 0) {
- ret = -EEXIST;
- goto out2;
- }
+ err = -ENOTTY;
+ goto err_dev;
}
- /* Initialize the new ppp unit */
- ppp->file.index = ret;
- sprintf(dev->name, "ppp%d", ret);
+ err = ppp_dev_configure(net, dev, &conf);
+ if (err < 0)
+ goto err_dev;
- ret = register_netdevice(dev);
- if (ret != 0) {
- unit_put(&pn->units_idr, ppp->file.index);
- netdev_err(ppp->dev, "PPP: couldn't register device %s (%d)\n",
- dev->name, ret);
- goto out2;
- }
-
- ppp->ppp_net = net;
- file->private_data = &ppp->file;
+ ppp = netdev_priv(dev);
*unit = ppp->file.index;
- atomic_inc(&ppp_unit_count);
+ file->private_data = &ppp->file;
- mutex_unlock(&pn->all_ppp_mutex);
mutex_unlock(&ppp_mutex);
rtnl_unlock();
return 0;
-out2:
- mutex_unlock(&pn->all_ppp_mutex);
+err_dev:
mutex_unlock(&ppp_mutex);
rtnl_unlock();
free_netdev(dev);
-out1:
- return ret;
+err:
+ return err;
}
/*
--
2.8.0.rc3
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