![David S. Miller](/assets/img/avatar_default.png)
Jesse Gross says: ==================== A few different bug fixes, including several for issues with userspace communication that have gone unnoticed up until now. These are intended for net/3.9. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
402 lines
10 KiB
C
402 lines
10 KiB
C
/*
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* Copyright (c) 2007-2012 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include <linux/etherdevice.h>
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#include <linux/if.h>
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#include <linux/if_vlan.h>
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#include <linux/jhash.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/percpu.h>
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#include <linux/rcupdate.h>
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#include <linux/rtnetlink.h>
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#include <linux/compat.h>
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#include <net/net_namespace.h>
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#include "datapath.h"
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#include "vport.h"
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#include "vport-internal_dev.h"
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/* List of statically compiled vport implementations. Don't forget to also
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* add yours to the list at the bottom of vport.h. */
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static const struct vport_ops *vport_ops_list[] = {
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&ovs_netdev_vport_ops,
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&ovs_internal_vport_ops,
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};
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/* Protected by RCU read lock for reading, RTNL lock for writing. */
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static struct hlist_head *dev_table;
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#define VPORT_HASH_BUCKETS 1024
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/**
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* ovs_vport_init - initialize vport subsystem
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*
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* Called at module load time to initialize the vport subsystem.
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*/
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int ovs_vport_init(void)
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{
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dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
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GFP_KERNEL);
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if (!dev_table)
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return -ENOMEM;
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return 0;
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}
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/**
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* ovs_vport_exit - shutdown vport subsystem
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*
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* Called at module exit time to shutdown the vport subsystem.
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*/
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void ovs_vport_exit(void)
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{
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kfree(dev_table);
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}
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static struct hlist_head *hash_bucket(struct net *net, const char *name)
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{
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unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
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return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
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}
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/**
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* ovs_vport_locate - find a port that has already been created
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*
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* @name: name of port to find
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*
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* Must be called with RTNL or RCU read lock.
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*/
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struct vport *ovs_vport_locate(struct net *net, const char *name)
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{
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struct hlist_head *bucket = hash_bucket(net, name);
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struct vport *vport;
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hlist_for_each_entry_rcu(vport, bucket, hash_node)
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if (!strcmp(name, vport->ops->get_name(vport)) &&
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net_eq(ovs_dp_get_net(vport->dp), net))
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return vport;
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return NULL;
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}
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/**
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* ovs_vport_alloc - allocate and initialize new vport
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*
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* @priv_size: Size of private data area to allocate.
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* @ops: vport device ops
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*
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* Allocate and initialize a new vport defined by @ops. The vport will contain
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* a private data area of size @priv_size that can be accessed using
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* vport_priv(). vports that are no longer needed should be released with
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* vport_free().
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*/
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struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
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const struct vport_parms *parms)
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{
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struct vport *vport;
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size_t alloc_size;
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alloc_size = sizeof(struct vport);
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if (priv_size) {
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alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
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alloc_size += priv_size;
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}
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vport = kzalloc(alloc_size, GFP_KERNEL);
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if (!vport)
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return ERR_PTR(-ENOMEM);
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vport->dp = parms->dp;
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vport->port_no = parms->port_no;
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vport->upcall_portid = parms->upcall_portid;
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vport->ops = ops;
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INIT_HLIST_NODE(&vport->dp_hash_node);
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vport->percpu_stats = alloc_percpu(struct vport_percpu_stats);
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if (!vport->percpu_stats) {
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kfree(vport);
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return ERR_PTR(-ENOMEM);
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}
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spin_lock_init(&vport->stats_lock);
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return vport;
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}
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/**
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* ovs_vport_free - uninitialize and free vport
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*
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* @vport: vport to free
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*
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* Frees a vport allocated with vport_alloc() when it is no longer needed.
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*
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* The caller must ensure that an RCU grace period has passed since the last
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* time @vport was in a datapath.
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*/
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void ovs_vport_free(struct vport *vport)
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{
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free_percpu(vport->percpu_stats);
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kfree(vport);
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}
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/**
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* ovs_vport_add - add vport device (for kernel callers)
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*
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* @parms: Information about new vport.
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*
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* Creates a new vport with the specified configuration (which is dependent on
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* device type). RTNL lock must be held.
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*/
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struct vport *ovs_vport_add(const struct vport_parms *parms)
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{
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struct vport *vport;
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int err = 0;
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int i;
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ASSERT_RTNL();
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for (i = 0; i < ARRAY_SIZE(vport_ops_list); i++) {
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if (vport_ops_list[i]->type == parms->type) {
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struct hlist_head *bucket;
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vport = vport_ops_list[i]->create(parms);
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if (IS_ERR(vport)) {
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err = PTR_ERR(vport);
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goto out;
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}
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bucket = hash_bucket(ovs_dp_get_net(vport->dp),
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vport->ops->get_name(vport));
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hlist_add_head_rcu(&vport->hash_node, bucket);
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return vport;
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}
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}
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err = -EAFNOSUPPORT;
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out:
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return ERR_PTR(err);
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}
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/**
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* ovs_vport_set_options - modify existing vport device (for kernel callers)
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*
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* @vport: vport to modify.
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* @port: New configuration.
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*
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* Modifies an existing device with the specified configuration (which is
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* dependent on device type). RTNL lock must be held.
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*/
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int ovs_vport_set_options(struct vport *vport, struct nlattr *options)
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{
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ASSERT_RTNL();
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if (!vport->ops->set_options)
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return -EOPNOTSUPP;
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return vport->ops->set_options(vport, options);
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}
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/**
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* ovs_vport_del - delete existing vport device
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*
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* @vport: vport to delete.
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*
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* Detaches @vport from its datapath and destroys it. It is possible to fail
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* for reasons such as lack of memory. RTNL lock must be held.
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*/
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void ovs_vport_del(struct vport *vport)
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{
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ASSERT_RTNL();
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hlist_del_rcu(&vport->hash_node);
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vport->ops->destroy(vport);
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}
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/**
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* ovs_vport_get_stats - retrieve device stats
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*
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* @vport: vport from which to retrieve the stats
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* @stats: location to store stats
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*
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* Retrieves transmit, receive, and error stats for the given device.
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*
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* Must be called with RTNL lock or rcu_read_lock.
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*/
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void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
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{
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int i;
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memset(stats, 0, sizeof(*stats));
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/* We potentially have 2 sources of stats that need to be combined:
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* those we have collected (split into err_stats and percpu_stats) from
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* set_stats() and device error stats from netdev->get_stats() (for
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* errors that happen downstream and therefore aren't reported through
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* our vport_record_error() function).
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* Stats from first source are reported by ovs (OVS_VPORT_ATTR_STATS).
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* netdev-stats can be directly read over netlink-ioctl.
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*/
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spin_lock_bh(&vport->stats_lock);
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stats->rx_errors = vport->err_stats.rx_errors;
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stats->tx_errors = vport->err_stats.tx_errors;
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stats->tx_dropped = vport->err_stats.tx_dropped;
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stats->rx_dropped = vport->err_stats.rx_dropped;
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spin_unlock_bh(&vport->stats_lock);
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for_each_possible_cpu(i) {
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const struct vport_percpu_stats *percpu_stats;
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struct vport_percpu_stats local_stats;
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unsigned int start;
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percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
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do {
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start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
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local_stats = *percpu_stats;
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} while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
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stats->rx_bytes += local_stats.rx_bytes;
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stats->rx_packets += local_stats.rx_packets;
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stats->tx_bytes += local_stats.tx_bytes;
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stats->tx_packets += local_stats.tx_packets;
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}
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}
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/**
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* ovs_vport_get_options - retrieve device options
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*
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* @vport: vport from which to retrieve the options.
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* @skb: sk_buff where options should be appended.
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*
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* Retrieves the configuration of the given device, appending an
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* %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested
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* vport-specific attributes to @skb.
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*
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* Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another
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* negative error code if a real error occurred. If an error occurs, @skb is
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* left unmodified.
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*
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* Must be called with RTNL lock or rcu_read_lock.
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*/
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int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
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{
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struct nlattr *nla;
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nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS);
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if (!nla)
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return -EMSGSIZE;
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if (vport->ops->get_options) {
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int err = vport->ops->get_options(vport, skb);
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if (err) {
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nla_nest_cancel(skb, nla);
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return err;
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}
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}
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nla_nest_end(skb, nla);
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return 0;
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}
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/**
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* ovs_vport_receive - pass up received packet to the datapath for processing
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*
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* @vport: vport that received the packet
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* @skb: skb that was received
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*
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* Must be called with rcu_read_lock. The packet cannot be shared and
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* skb->data should point to the Ethernet header.
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*/
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void ovs_vport_receive(struct vport *vport, struct sk_buff *skb)
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{
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struct vport_percpu_stats *stats;
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stats = this_cpu_ptr(vport->percpu_stats);
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u64_stats_update_begin(&stats->sync);
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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u64_stats_update_end(&stats->sync);
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ovs_dp_process_received_packet(vport, skb);
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}
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/**
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* ovs_vport_send - send a packet on a device
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*
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* @vport: vport on which to send the packet
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* @skb: skb to send
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*
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* Sends the given packet and returns the length of data sent. Either RTNL
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* lock or rcu_read_lock must be held.
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*/
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int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
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{
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int sent = vport->ops->send(vport, skb);
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if (likely(sent)) {
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struct vport_percpu_stats *stats;
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stats = this_cpu_ptr(vport->percpu_stats);
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u64_stats_update_begin(&stats->sync);
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stats->tx_packets++;
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stats->tx_bytes += sent;
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u64_stats_update_end(&stats->sync);
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}
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return sent;
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}
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/**
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* ovs_vport_record_error - indicate device error to generic stats layer
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*
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* @vport: vport that encountered the error
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* @err_type: one of enum vport_err_type types to indicate the error type
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*
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* If using the vport generic stats layer indicate that an error of the given
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* type has occured.
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*/
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void ovs_vport_record_error(struct vport *vport, enum vport_err_type err_type)
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{
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spin_lock(&vport->stats_lock);
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switch (err_type) {
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case VPORT_E_RX_DROPPED:
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vport->err_stats.rx_dropped++;
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break;
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case VPORT_E_RX_ERROR:
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vport->err_stats.rx_errors++;
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break;
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case VPORT_E_TX_DROPPED:
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vport->err_stats.tx_dropped++;
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break;
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case VPORT_E_TX_ERROR:
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vport->err_stats.tx_errors++;
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break;
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}
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spin_unlock(&vport->stats_lock);
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}
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