#include <linux/delay.h>
#include <linux/time.h>
#include <linux/etherdevice.h>
+#include <linux/genetlink.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
EXPORT_SYMBOL(dp_ioctl_hook);
-/* Datapaths. Protected on the read side by rcu_read_lock, on the write side
- * by dp_mutex.
+/**
+ * DOC: Locking:
*
- * dp_mutex nests inside the RTNL lock: if you need both you must take the RTNL
- * lock first.
+ * Writes to device state (add/remove datapath, port, set operations on vports,
+ * etc.) are protected by RTNL.
*
- * It is safe to access the datapath and vport structures with just
- * dp_mutex.
+ * Writes to other state (flow table modifications, set miscellaneous datapath
+ * parameters such as drop frags, etc.) are protected by genl_mutex. The RTNL
+ * lock nests inside genl_mutex.
+ *
+ * Reads are protected by RCU.
+ *
+ * There are a few special cases (mostly stats) that have their own
+ * synchronization but they nest under all of above and don't interact with
+ * each other.
*/
+
+/* Protected by genl_mutex. */
static struct datapath __rcu *dps[256];
-static DEFINE_MUTEX(dp_mutex);
static struct vport *new_vport(const struct vport_parms *);
-/* Must be called with rcu_read_lock or dp_mutex. */
+/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
struct datapath *get_dp(int dp_idx)
{
if (dp_idx < 0 || dp_idx >= ARRAY_SIZE(dps))
return NULL;
+
return rcu_dereference_check(dps[dp_idx], rcu_read_lock_held() ||
- lockdep_is_held(&dp_mutex));
+ lockdep_rtnl_is_held() ||
+ lockdep_genl_is_held());
}
EXPORT_SYMBOL_GPL(get_dp);
-static struct datapath *get_dp_locked(int dp_idx)
-{
- struct datapath *dp;
-
- mutex_lock(&dp_mutex);
- dp = get_dp(dp_idx);
- if (dp)
- mutex_lock(&dp->mutex);
- mutex_unlock(&dp_mutex);
- return dp;
-}
-
+/* Must be called with genl_mutex. */
static struct tbl *get_table_protected(struct datapath *dp)
{
- return rcu_dereference_protected(dp->table,
- lockdep_is_held(&dp->mutex));
+ return rcu_dereference_protected(dp->table, lockdep_genl_is_held());
}
+/* Must be called with rcu_read_lock or RTNL lock. */
static struct vport *get_vport_protected(struct datapath *dp, u16 port_no)
{
- return rcu_dereference_protected(dp->ports[port_no],
- lockdep_is_held(&dp->mutex));
+ return rcu_dereference_rtnl(dp->ports[port_no]);
}
/* Must be called with rcu_read_lock or RTNL lock. */
+ nla_total_size(1); /* IFLA_OPERSTATE */
}
+/* Caller must hold RTNL lock. */
static int dp_fill_ifinfo(struct sk_buff *skb,
const struct vport *port,
int event, unsigned int flags)
return -EMSGSIZE;
}
+/* Caller must hold RTNL lock. */
static void dp_ifinfo_notify(int event, struct vport *port)
{
struct sk_buff *skb;
kobject_put(&dp->ifobj);
}
-/* Caller must hold RTNL, dp_mutex, and dp->mutex. */
-static void destroy_dp(struct datapath *dp)
-{
- struct vport *p, *n;
-
- list_for_each_entry_safe (p, n, &dp->port_list, node)
- if (p->port_no != ODPP_LOCAL)
- dp_detach_port(p);
-
- dp_sysfs_del_dp(dp);
- rcu_assign_pointer(dps[dp->dp_idx], NULL);
- dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
-
- mutex_unlock(&dp->mutex);
- call_rcu(&dp->rcu, destroy_dp_rcu);
- module_put(THIS_MODULE);
-}
-
-/* Called with RTNL lock and dp->mutex. */
+/* Called with RTNL lock and genl_lock. */
static struct vport *new_vport(const struct vport_parms *parms)
{
struct vport *vport;
struct datapath *dp = parms->dp;
rcu_assign_pointer(dp->ports[parms->port_no], vport);
- list_add_rcu(&vport->node, &dp->port_list);
+ list_add(&vport->node, &dp->port_list);
dp_ifinfo_notify(RTM_NEWLINK, vport);
}
return vport;
}
+/* Called with RTNL lock. */
int dp_detach_port(struct vport *p)
{
ASSERT_RTNL();
dp_ifinfo_notify(RTM_DELLINK, p);
/* First drop references to device. */
- list_del_rcu(&p->node);
+ list_del(&p->node);
rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
/* Then destroy it. */
return err;
}
+/* Called with genl_mutex. */
static int flush_flows(int dp_idx)
{
struct tbl *old_table;
struct tbl *new_table;
struct datapath *dp;
- int err;
- dp = get_dp_locked(dp_idx);
- err = -ENODEV;
+ dp = get_dp(dp_idx);
if (!dp)
- goto exit;
+ return -ENODEV;
old_table = get_table_protected(dp);
new_table = tbl_create(TBL_MIN_BUCKETS);
- err = -ENOMEM;
if (!new_table)
- goto exit_unlock;
+ return -ENOMEM;
rcu_assign_pointer(dp->table, new_table);
tbl_deferred_destroy(old_table, flow_free_tbl);
- err = 0;
-
-exit_unlock:
- mutex_unlock(&dp->mutex);
-exit:
- return err;
+ return 0;
}
static int validate_actions(const struct nlattr *actions, u32 actions_len)
flow->byte_count = 0;
}
+/* Called with genl_mutex. */
static int expand_table(struct datapath *dp)
{
struct tbl *old_table = get_table_protected(dp);
}
}
-/* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
+/* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports.
+ * Called with RTNL lock.
+ */
int dp_min_mtu(const struct datapath *dp)
{
struct vport *p;
ASSERT_RTNL();
- list_for_each_entry_rcu (p, &dp->port_list, node) {
+ list_for_each_entry (p, &dp->port_list, node) {
int dev_mtu;
/* Skip any internal ports, since that's what we're trying to
return mtu ? mtu : ETH_DATA_LEN;
}
-/* Sets the MTU of all datapath devices to the minimum of the ports. Must
- * be called with RTNL lock. */
+/* Sets the MTU of all datapath devices to the minimum of the ports
+ * Called with RTNL lock.
+ */
void set_internal_devs_mtu(const struct datapath *dp)
{
struct vport *p;
mtu = dp_min_mtu(dp);
- list_for_each_entry_rcu (p, &dp->port_list, node) {
+ list_for_each_entry (p, &dp->port_list, node) {
if (is_internal_vport(p))
vport_set_mtu(p, mtu);
}
[ODP_FLOW_ATTR_STATE] = { .type = NLA_U64 },
};
+
static int copy_flow_to_user(struct odp_flow __user *dst, struct datapath *dp,
struct sw_flow *flow, u32 total_len, u64 state)
{
int err;
sf_acts = rcu_dereference_protected(flow->sf_acts,
- lockdep_is_held(&dp->mutex));
+ lockdep_genl_is_held());
skb = alloc_skb(128 + FLOW_BUFSIZE + sf_acts->actions_len, GFP_KERNEL);
err = -ENOMEM;
if (!skb)
goto exit;
- rcu_read_lock();
odp_flow = (struct odp_flow*)__skb_put(skb, sizeof(struct odp_flow));
odp_flow->dp_idx = dp->dp_idx;
odp_flow->total_len = total_len;
goto nla_put_failure;
err = flow_to_nlattrs(&flow->key, skb);
if (err)
- goto exit_unlock;
+ goto exit_free;
nla_nest_end(skb, nla);
nla = nla_nest_start(skb, ODP_FLOW_ATTR_ACTIONS);
odp_flow->len = skb->len;
err = copy_to_user(dst, skb->data, skb->len) ? -EFAULT : 0;
- goto exit_unlock;
+ goto exit_free;
nla_put_failure:
err = -EMSGSIZE;
-exit_unlock:
- rcu_read_unlock();
+exit_free:
kfree_skb(skb);
exit:
return err;
}
+/* Called with genl_mutex. */
static struct sk_buff *copy_flow_from_user(struct odp_flow __user *uodp_flow,
struct dp_flowcmd *flowcmd)
{
if (IS_ERR(skb))
goto exit;
- dp = get_dp_locked(flowcmd.dp_idx);
+ dp = get_dp(flowcmd.dp_idx);
error = -ENODEV;
if (!dp)
- goto error_kfree_skb;
+ goto exit;
hash = flow_hash(&flowcmd.key);
table = get_table_protected(dp);
/* Bail out if we're not allowed to create a new flow. */
error = -ENOENT;
if (cmd == ODP_FLOW_SET)
- goto error_unlock_dp;
+ goto exit;
/* Expand table, if necessary, to make room. */
if (tbl_count(table) >= tbl_n_buckets(table)) {
error = expand_table(dp);
if (error)
- goto error_unlock_dp;
+ goto exit;
table = get_table_protected(dp);
}
flow = flow_alloc();
if (IS_ERR(flow)) {
error = PTR_ERR(flow);
- goto error_unlock_dp;
+ goto exit;
}
flow->key = flowcmd.key;
clear_stats(flow);
/* Update actions. */
flow = flow_cast(flow_node);
old_acts = rcu_dereference_protected(flow->sf_acts,
- lockdep_is_held(&dp->mutex));
+ lockdep_genl_is_held());
if (flowcmd.actions &&
(old_acts->actions_len != flowcmd.actions_len ||
memcmp(old_acts->actions, flowcmd.actions,
}
}
kfree_skb(skb);
- mutex_unlock(&dp->mutex);
return 0;
error_free_flow:
flow_put(flow);
-error_unlock_dp:
- mutex_unlock(&dp->mutex);
error_kfree_skb:
kfree_skb(skb);
exit:
int err;
skb = copy_flow_from_user(uodp_flow, &flowcmd);
- err = PTR_ERR(skb);
if (IS_ERR(skb))
- goto exit;
+ return PTR_ERR(skb);
- dp = get_dp_locked(flowcmd.dp_idx);
- err = -ENODEV;
+ dp = get_dp(flowcmd.dp_idx);
if (!dp)
- goto exit_kfree_skb;
+ return -ENODEV;
table = get_table_protected(dp);
flow_node = tbl_lookup(table, &flowcmd.key, flow_hash(&flowcmd.key), flow_cmp);
- err = -ENOENT;
if (!flow_node)
- goto exit_unlock_dp;
+ return -ENOENT;
if (cmd == ODP_FLOW_DEL) {
err = tbl_remove(table, flow_node);
if (err)
- goto exit_unlock_dp;
+ return err;
}
flow = flow_cast(flow_node);
if (!err && cmd == ODP_FLOW_DEL)
flow_deferred_free(flow);
-exit_unlock_dp:
- mutex_unlock(&dp->mutex);
-exit_kfree_skb:
- kfree_skb(skb);
-exit:
return err;
}
if (IS_ERR(skb))
goto exit;
- dp = get_dp_locked(flowcmd.dp_idx);
+ dp = get_dp(flowcmd.dp_idx);
err = -ENODEV;
if (!dp)
- goto exit_free;
+ goto exit_kfree_skb;
bucket = flowcmd.state >> 32;
obj = flowcmd.state;
- flow_node = tbl_next(dp->table, &bucket, &obj);
+ flow_node = tbl_next(get_table_protected(dp), &bucket, &obj);
err = -ENODEV;
if (!flow_node)
- goto exit_unlock_dp;
+ goto exit_kfree_skb;
flow = flow_cast(flow_node);
err = copy_flow_to_user(uodp_flow, dp, flow, flowcmd.total_len,
((u64)bucket << 32) | obj);
-exit_unlock_dp:
- mutex_unlock(&dp->mutex);
-exit_free:
+exit_kfree_skb:
kfree_skb(skb);
exit:
return err;
[ODP_DP_ATTR_SAMPLING] = { .type = NLA_U32 },
};
+/* Called with genl_mutex. */
static int copy_datapath_to_user(void __user *dst, struct datapath *dp, uint32_t total_len)
{
struct odp_datapath *odp_datapath;
return err;
}
+/* Called with genl_mutex. */
static struct sk_buff *copy_datapath_from_user(struct odp_datapath __user *uodp_datapath, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
{
struct odp_datapath *odp_datapath;
return ERR_PTR(err);
}
-/* Called with dp_mutex and optionally with RTNL lock also.
- * Holds the returned datapath's mutex on return.
- */
+/* Called with genl_mutex and optionally with RTNL lock also. */
static struct datapath *lookup_datapath(struct odp_datapath *odp_datapath, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
{
- WARN_ON_ONCE(!mutex_is_locked(&dp_mutex));
-
if (!a[ODP_DP_ATTR_NAME]) {
- struct datapath *dp;
-
- dp = get_dp(odp_datapath->dp_idx);
+ struct datapath *dp = get_dp(odp_datapath->dp_idx);
if (!dp)
return ERR_PTR(-ENODEV);
- mutex_lock(&dp->mutex);
return dp;
} else {
- struct datapath *dp;
struct vport *vport;
int dp_idx;
if (dp_idx < 0)
return ERR_PTR(-ENODEV);
-
- dp = get_dp(dp_idx);
- mutex_lock(&dp->mutex);
- return dp;
+ return vport->dp;
}
}
+/* Called with genl_mutex. */
static void change_datapath(struct datapath *dp, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
{
if (a[ODP_DP_ATTR_IPV4_FRAGS])
goto err_free_skb;
rtnl_lock();
- mutex_lock(&dp_mutex);
err = -ENODEV;
if (!try_module_get(THIS_MODULE))
- goto err_unlock_dp_mutex;
+ goto err_unlock_rtnl;
dp_idx = odp_datapath->dp_idx;
if (dp_idx < 0) {
if (dp == NULL)
goto err_put_module;
INIT_LIST_HEAD(&dp->port_list);
- mutex_init(&dp->mutex);
- mutex_lock(&dp->mutex);
dp->dp_idx = dp_idx;
for (i = 0; i < DP_N_QUEUES; i++)
skb_queue_head_init(&dp->queues[i]);
rcu_assign_pointer(dps[dp_idx], dp);
dp_sysfs_add_dp(dp);
- mutex_unlock(&dp->mutex);
- mutex_unlock(&dp_mutex);
rtnl_unlock();
return 0;
err_destroy_table:
tbl_destroy(get_table_protected(dp), NULL);
err_free_dp:
- mutex_unlock(&dp->mutex);
kfree(dp);
err_put_module:
module_put(THIS_MODULE);
-err_unlock_dp_mutex:
- mutex_unlock(&dp_mutex);
+err_unlock_rtnl:
rtnl_unlock();
err_free_skb:
kfree_skb(skb);
static int del_datapath(struct odp_datapath __user *uodp_datapath)
{
struct nlattr *a[ODP_DP_ATTR_MAX + 1];
+ struct vport *vport, *next_vport;
struct datapath *dp;
struct sk_buff *skb;
int err;
goto exit;
rtnl_lock();
- mutex_lock(&dp_mutex);
dp = lookup_datapath((struct odp_datapath *)skb->data, a);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto exit_free;
- destroy_dp(dp);
+ list_for_each_entry_safe (vport, next_vport, &dp->port_list, node)
+ if (vport->port_no != ODPP_LOCAL)
+ dp_detach_port(vport);
+
+ dp_sysfs_del_dp(dp);
+ rcu_assign_pointer(dps[dp->dp_idx], NULL);
+ dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
+
+ call_rcu(&dp->rcu, destroy_dp_rcu);
+ module_put(THIS_MODULE);
+
err = 0;
exit_free:
kfree_skb(skb);
- mutex_unlock(&dp_mutex);
rtnl_unlock();
exit:
return err;
if (IS_ERR(skb))
goto exit;
- mutex_lock(&dp_mutex);
dp = lookup_datapath((struct odp_datapath *)skb->data, a);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto exit_free;
change_datapath(dp, a);
- mutex_unlock(&dp->mutex);
err = 0;
exit_free:
kfree_skb(skb);
- mutex_unlock(&dp_mutex);
exit:
return err;
}
goto exit;
odp_datapath = (struct odp_datapath *)skb->data;
- mutex_lock(&dp_mutex);
dp = lookup_datapath(odp_datapath, a);
- mutex_unlock(&dp_mutex);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto exit_free;
err = copy_datapath_to_user(uodp_datapath, dp, odp_datapath->total_len);
- mutex_unlock(&dp->mutex);
exit_free:
kfree_skb(skb);
exit:
goto exit;
odp_datapath = (struct odp_datapath *)skb->data;
- mutex_lock(&dp_mutex);
+ err = -ENODEV;
for (dp_idx = odp_datapath->dp_idx; dp_idx < ARRAY_SIZE(dps); dp_idx++) {
struct datapath *dp = get_dp(dp_idx);
if (!dp)
continue;
- mutex_lock(&dp->mutex);
- mutex_unlock(&dp_mutex);
err = copy_datapath_to_user(uodp_datapath, dp, odp_datapath->total_len);
- mutex_unlock(&dp->mutex);
- goto exit_free;
+ break;
}
- mutex_unlock(&dp_mutex);
- err = -ENODEV;
-
-exit_free:
kfree_skb(skb);
exit:
return err;
[ODP_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
};
-static int copy_vport_to_user(void __user *dst, struct vport *vport, uint32_t total_len)
+/* Called with RCU read lock. */
+static struct sk_buff *odp_vport_build_info(struct vport *vport, uint32_t total_len)
{
struct odp_vport *odp_vport;
struct sk_buff *skb;
int ifindex, iflink;
int err;
- skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+ skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
err = -ENOMEM;
if (!skb)
- goto exit;
+ goto err;
- rcu_read_lock();
odp_vport = (struct odp_vport*)__skb_put(skb, sizeof(struct odp_vport));
odp_vport->dp_idx = vport->dp->dp_idx;
odp_vport->total_len = total_len;
err = -EMSGSIZE;
if (skb->len > total_len)
- goto exit_unlock;
+ goto err_free;
odp_vport->len = skb->len;
- err = copy_to_user(dst, skb->data, skb->len) ? -EFAULT : 0;
- goto exit_unlock;
+ return skb;
nla_put_failure:
err = -EMSGSIZE;
-exit_unlock:
- rcu_read_unlock();
+err_free:
kfree_skb(skb);
-exit:
- return err;
+err:
+ return ERR_PTR(err);
}
static struct sk_buff *copy_vport_from_user(struct odp_vport __user *uodp_vport,
return ERR_PTR(err);
}
-
-/* Called without any locks (or with RTNL lock).
- * Returns holding vport->dp->mutex.
- */
+/* Called with RTNL lock or RCU read lock. */
static struct vport *lookup_vport(struct odp_vport *odp_vport,
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
{
struct vport *vport;
if (a[ODP_VPORT_ATTR_NAME]) {
- int dp_idx, port_no;
-
- retry:
- rcu_read_lock();
vport = vport_locate(nla_data(a[ODP_VPORT_ATTR_NAME]));
- if (!vport) {
- rcu_read_unlock();
+ if (!vport)
return ERR_PTR(-ENODEV);
- }
- dp_idx = vport->dp->dp_idx;
- port_no = vport->port_no;
- rcu_read_unlock();
-
- dp = get_dp_locked(dp_idx);
- if (!dp)
- goto retry;
-
- vport = get_vport_protected(dp, port_no);
- if (!vport ||
- strcmp(vport_get_name(vport), nla_data(a[ODP_VPORT_ATTR_NAME]))) {
- mutex_unlock(&dp->mutex);
- goto retry;
- }
-
return vport;
} else if (a[ODP_VPORT_ATTR_PORT_NO]) {
u32 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
if (port_no >= DP_MAX_PORTS)
return ERR_PTR(-EINVAL);
- dp = get_dp_locked(odp_vport->dp_idx);
+ dp = get_dp(odp_vport->dp_idx);
if (!dp)
return ERR_PTR(-ENODEV);
vport = get_vport_protected(dp, port_no);
- if (!vport) {
- mutex_unlock(&dp->mutex);
+ if (!vport)
return ERR_PTR(-ENOENT);
- }
return vport;
} else
return ERR_PTR(-EINVAL);
}
+/* Called with RTNL lock. */
static int change_vport(struct vport *vport, struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
{
int err = 0;
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
struct odp_vport *odp_vport;
struct vport_parms parms;
+ struct sk_buff *reply;
struct vport *vport;
struct sk_buff *skb;
struct datapath *dp;
goto exit_kfree_skb;
rtnl_lock();
-
- dp = get_dp_locked(odp_vport->dp_idx);
+ dp = get_dp(odp_vport->dp_idx);
err = -ENODEV;
if (!dp)
- goto exit_unlock_rtnl;
+ goto exit_unlock;
if (a[ODP_VPORT_ATTR_PORT_NO]) {
port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
err = -EFBIG;
if (port_no >= DP_MAX_PORTS)
- goto exit_unlock_dp;
+ goto exit_unlock;
vport = get_vport_protected(dp, port_no);
err = -EBUSY;
if (vport)
- goto exit_unlock_dp;
+ goto exit_unlock;
} else {
for (port_no = 1; ; port_no++) {
if (port_no >= DP_MAX_PORTS) {
err = -EFBIG;
- goto exit_unlock_dp;
+ goto exit_unlock;
}
vport = get_vport_protected(dp, port_no);
if (!vport)
vport = new_vport(&parms);
err = PTR_ERR(vport);
if (IS_ERR(vport))
- goto exit_unlock_dp;
+ goto exit_unlock;
set_internal_devs_mtu(dp);
dp_sysfs_add_if(vport);
err = change_vport(vport, a);
if (err) {
dp_detach_port(vport);
- goto exit_unlock_dp;
+ goto exit_unlock;
}
- err = copy_vport_to_user(uodp_vport, vport, odp_vport->total_len);
+ reply = odp_vport_build_info(vport, odp_vport->total_len);
+ err = PTR_ERR(reply);
+ if (IS_ERR(reply))
+ goto exit_unlock;
+
+ err = copy_to_user(uodp_vport, reply->data, reply->len) ? -EFAULT : 0;
+ kfree_skb(reply);
-exit_unlock_dp:
- mutex_unlock(&dp->mutex);
-exit_unlock_rtnl:
+exit_unlock:
rtnl_unlock();
exit_kfree_skb:
kfree_skb(skb);
if (!err)
err = change_vport(vport, a);
- mutex_unlock(&vport->dp->mutex);
exit_free:
kfree_skb(skb);
rtnl_unlock();
static int del_vport(unsigned int cmd, struct odp_vport __user *uodp_vport)
{
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
- struct datapath *dp;
struct vport *vport;
struct sk_buff *skb;
int err;
rtnl_lock();
vport = lookup_vport((struct odp_vport *)skb->data, a);
err = PTR_ERR(vport);
- if (IS_ERR(vport))
- goto exit_free;
- dp = vport->dp;
-
- err = -EINVAL;
- if (vport->port_no == ODPP_LOCAL)
- goto exit_free;
+ if (!IS_ERR(vport))
+ err = dp_detach_port(vport);
- err = dp_detach_port(vport);
- mutex_unlock(&dp->mutex);
-exit_free:
kfree_skb(skb);
rtnl_unlock();
exit:
{
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
struct odp_vport *odp_vport;
+ struct sk_buff *reply;
struct vport *vport;
struct sk_buff *skb;
int err;
skb = copy_vport_from_user(uodp_vport, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
- goto exit;
+ goto err;
odp_vport = (struct odp_vport *)skb->data;
+ rcu_read_lock();
vport = lookup_vport(odp_vport, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
- goto exit_free;
+ goto err_unlock_rcu;
+ reply = odp_vport_build_info(vport, odp_vport->total_len);
+ rcu_read_unlock();
- err = copy_vport_to_user(uodp_vport, vport, odp_vport->total_len);
- mutex_unlock(&vport->dp->mutex);
-exit_free:
+ err = PTR_ERR(reply);
+ if (IS_ERR(reply))
+ goto err_kfree_skb;
+
+ err = copy_to_user(uodp_vport, reply->data, reply->len) ? -EFAULT : 0;
+ kfree_skb(reply);
kfree_skb(skb);
-exit:
+
+ return err;
+
+err_unlock_rcu:
+ rcu_read_unlock();
+err_kfree_skb:
+ kfree_skb(skb);
+err:
return err;
}
skb = copy_vport_from_user(uodp_vport, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
- goto exit;
+ goto err;
odp_vport = (struct odp_vport *)skb->data;
- dp = get_dp_locked(odp_vport->dp_idx);
+ dp = get_dp(odp_vport->dp_idx);
err = -ENODEV;
if (!dp)
- goto exit_free;
+ goto err_kfree_skb;
port_no = 0;
if (a[ODP_VPORT_ATTR_PORT_NO])
port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
+
+ rcu_read_lock();
for (; port_no < DP_MAX_PORTS; port_no++) {
- struct vport *vport = get_vport_protected(dp, port_no);
- if (vport) {
- err = copy_vport_to_user(uodp_vport, vport, odp_vport->total_len);
- goto exit_unlock_dp;
- }
+ struct sk_buff *skb_out;
+ struct vport *vport;
+ int retval;
+
+ vport = get_vport_protected(dp, port_no);
+ if (!vport)
+ continue;
+
+ skb_out = odp_vport_build_info(vport, odp_vport->total_len);
+ rcu_read_unlock();
+
+ err = PTR_ERR(skb_out);
+ if (IS_ERR(skb_out))
+ goto err_kfree_skb;
+
+ retval = copy_to_user(uodp_vport, skb_out->data, skb_out->len);
+ kfree_skb(skb_out);
+ kfree_skb(skb);
+
+ return retval ? -EFAULT : 0;
}
+ rcu_read_unlock();
err = -ENODEV;
-exit_unlock_dp:
- mutex_unlock(&dp->mutex);
-exit_free:
+err_kfree_skb:
kfree_skb(skb);
-exit:
+err:
return err;
}
static long openvswitch_ioctl(struct file *f, unsigned int cmd,
unsigned long argp)
{
- int dp_idx = iminor(f->f_dentry->d_inode);
- struct datapath *dp;
int listeners;
int err;
+ genl_lock();
+
/* Handle commands with special locking requirements up front. */
switch (cmd) {
case ODP_DP_NEW:
goto exit;
}
- dp = get_dp_locked(dp_idx);
- err = -ENODEV;
- if (!dp)
- goto exit;
-
switch (cmd) {
case ODP_GET_LISTEN_MASK:
err = put_user(get_listen_mask(f), (int __user *)argp);
err = -ENOIOCTLCMD;
break;
}
- mutex_unlock(&dp->mutex);
exit:
+ genl_unlock();
return err;
}
}
#endif
+static struct sk_buff *openvswitch_try_read(struct file *f, struct datapath *dp)
+{
+ int listeners = get_listen_mask(f);
+ int i;
+
+ for (i = 0; i < DP_N_QUEUES; i++) {
+ if (listeners & (1 << i)) {
+ struct sk_buff *skb = skb_dequeue(&dp->queues[i]);
+ if (skb)
+ return skb;
+ }
+ }
+
+ if (f->f_flags & O_NONBLOCK)
+ return ERR_PTR(-EAGAIN);
+
+ wait_event_interruptible(dp->waitqueue,
+ dp_has_packet_of_interest(dp, listeners));
+
+ if (signal_pending(current))
+ return ERR_PTR(-ERESTARTSYS);
+
+ return NULL;
+}
+
static ssize_t openvswitch_read(struct file *f, char __user *buf,
size_t nbytes, loff_t *ppos)
{
- int listeners = get_listen_mask(f);
int dp_idx = iminor(f->f_dentry->d_inode);
- struct datapath *dp = get_dp_locked(dp_idx);
+ struct datapath *dp;
struct sk_buff *skb;
struct iovec iov;
int retval;
- if (!dp)
- return -ENODEV;
-
- if (nbytes == 0 || !listeners)
- return 0;
+ genl_lock();
- for (;;) {
- int i;
-
- for (i = 0; i < DP_N_QUEUES; i++) {
- if (listeners & (1 << i)) {
- skb = skb_dequeue(&dp->queues[i]);
- if (skb)
- goto success;
- }
- }
+ dp = get_dp(dp_idx);
+ retval = -ENODEV;
+ if (!dp)
+ goto error;
- if (f->f_flags & O_NONBLOCK) {
- retval = -EAGAIN;
- goto error;
- }
+ retval = 0;
+ if (nbytes == 0 || !get_listen_mask(f))
+ goto error;
- wait_event_interruptible(dp->waitqueue,
- dp_has_packet_of_interest(dp,
- listeners));
+ do {
+ skb = openvswitch_try_read(f, dp);
+ } while (!skb);
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- goto error;
- }
- }
-success:
- mutex_unlock(&dp->mutex);
+ genl_unlock();
+ if (IS_ERR(skb))
+ return PTR_ERR(skb);
iov.iov_base = buf;
iov.iov_len = min_t(size_t, skb->len, nbytes);
return retval;
error:
- mutex_unlock(&dp->mutex);
+ genl_unlock();
return retval;
}
static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
{
int dp_idx = iminor(file->f_dentry->d_inode);
- struct datapath *dp = get_dp_locked(dp_idx);
+ struct datapath *dp;
unsigned int mask;
+ genl_lock();
+ dp = get_dp(dp_idx);
if (dp) {
mask = 0;
poll_wait(file, &dp->waitqueue, wait);
if (dp_has_packet_of_interest(dp, get_listen_mask(file)))
mask |= POLLIN | POLLRDNORM;
- mutex_unlock(&dp->mutex);
} else {
mask = POLLIN | POLLRDNORM | POLLHUP;
}
+ genl_unlock();
+
return mask;
}
projects / openvswitch / commitdiff