forked from Minki/linux
openvswitch: Minimize dp and vport critical sections.
Move most memory allocations away from the ovs_mutex critical sections. vport allocations still happen while the lock is taken, as changing that would require major refactoring. Also, vports are created very rarely so it should not matter. Change ovs_dp_cmd_get() now only takes the rcu_read_lock(), rather than ovs_lock(), as nothing need to be changed. This was done by ovs_vport_cmd_get() already. Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com> Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
This commit is contained in:
Jarno Rajahalme
Pravin B Shelar
parent
56c19868e1
commit
6093ae9aba
@ -1164,23 +1164,9 @@ error:
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return -EMSGSIZE;
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}
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/* Must be called with ovs_mutex. */
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static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp,
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struct genl_info *info, u8 cmd)
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static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
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{
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struct sk_buff *skb;
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int retval;
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skb = genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
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if (!skb)
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return ERR_PTR(-ENOMEM);
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retval = ovs_dp_cmd_fill_info(dp, skb, info->snd_portid, info->snd_seq, 0, cmd);
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if (retval < 0) {
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kfree_skb(skb);
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return ERR_PTR(retval);
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}
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return skb;
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return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL);
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}
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/* Called with rcu_read_lock or ovs_mutex. */
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@ -1233,12 +1219,14 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
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if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
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goto err;
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ovs_lock();
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reply = ovs_dp_cmd_alloc_info(info);
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if (!reply)
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return -ENOMEM;
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err = -ENOMEM;
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dp = kzalloc(sizeof(*dp), GFP_KERNEL);
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if (dp == NULL)
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goto err_unlock_ovs;
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goto err_free_reply;
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ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
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@ -1273,6 +1261,9 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
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ovs_dp_change(dp, a);
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/* So far only local changes have been made, now need the lock. */
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ovs_lock();
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vport = new_vport(&parms);
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if (IS_ERR(vport)) {
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err = PTR_ERR(vport);
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@ -1291,10 +1282,9 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
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goto err_destroy_ports_array;
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}
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reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
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err = PTR_ERR(reply);
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if (IS_ERR(reply))
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goto err_destroy_local_port;
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err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
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info->snd_seq, 0, OVS_DP_CMD_NEW);
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BUG_ON(err < 0);
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ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
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list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
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@ -1304,9 +1294,8 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
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ovs_notify(&dp_datapath_genl_family, reply, info);
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return 0;
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err_destroy_local_port:
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ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
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err_destroy_ports_array:
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ovs_unlock();
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kfree(dp->ports);
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err_destroy_percpu:
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free_percpu(dp->stats_percpu);
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@ -1315,8 +1304,8 @@ err_destroy_table:
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err_free_dp:
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release_net(ovs_dp_get_net(dp));
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kfree(dp);
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err_unlock_ovs:
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ovs_unlock();
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err_free_reply:
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kfree_skb(reply);
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err:
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return err;
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}
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@ -1354,16 +1343,19 @@ static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
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struct datapath *dp;
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int err;
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reply = ovs_dp_cmd_alloc_info(info);
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if (!reply)
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return -ENOMEM;
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ovs_lock();
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dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
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err = PTR_ERR(dp);
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if (IS_ERR(dp))
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goto unlock;
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goto err_unlock_free;
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reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_DEL);
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err = PTR_ERR(reply);
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if (IS_ERR(reply))
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goto unlock;
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err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
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info->snd_seq, 0, OVS_DP_CMD_DEL);
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BUG_ON(err < 0);
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__dp_destroy(dp);
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ovs_unlock();
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@ -1371,8 +1363,10 @@ static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
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ovs_notify(&dp_datapath_genl_family, reply, info);
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return 0;
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unlock:
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err_unlock_free:
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ovs_unlock();
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kfree_skb(reply);
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return err;
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}
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@ -1382,29 +1376,30 @@ static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
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struct datapath *dp;
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int err;
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reply = ovs_dp_cmd_alloc_info(info);
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if (!reply)
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return -ENOMEM;
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ovs_lock();
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dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
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err = PTR_ERR(dp);
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if (IS_ERR(dp))
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goto unlock;
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goto err_unlock_free;
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ovs_dp_change(dp, info->attrs);
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reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
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if (IS_ERR(reply)) {
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err = PTR_ERR(reply);
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genl_set_err(&dp_datapath_genl_family, sock_net(skb->sk), 0,
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0, err);
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err = 0;
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goto unlock;
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}
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err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
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info->snd_seq, 0, OVS_DP_CMD_NEW);
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BUG_ON(err < 0);
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ovs_unlock();
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ovs_notify(&dp_datapath_genl_family, reply, info);
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return 0;
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unlock:
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err_unlock_free:
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ovs_unlock();
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kfree_skb(reply);
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return err;
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}
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@ -1414,24 +1409,26 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
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struct datapath *dp;
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int err;
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ovs_lock();
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reply = ovs_dp_cmd_alloc_info(info);
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if (!reply)
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return -ENOMEM;
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rcu_read_lock();
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dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
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if (IS_ERR(dp)) {
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err = PTR_ERR(dp);
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goto unlock;
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goto err_unlock_free;
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}
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err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
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info->snd_seq, 0, OVS_DP_CMD_NEW);
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BUG_ON(err < 0);
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rcu_read_unlock();
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reply = ovs_dp_cmd_build_info(dp, info, OVS_DP_CMD_NEW);
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if (IS_ERR(reply)) {
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err = PTR_ERR(reply);
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goto unlock;
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}
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ovs_unlock();
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return genlmsg_reply(reply, info);
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unlock:
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ovs_unlock();
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err_unlock_free:
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rcu_read_unlock();
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kfree_skb(reply);
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return err;
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}
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@ -1544,7 +1541,12 @@ error:
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return err;
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}
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/* Called with ovs_mutex or RCU read lock. */
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static struct sk_buff *ovs_vport_cmd_alloc_info(void)
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{
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return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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}
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/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
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struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
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u32 seq, u8 cmd)
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{
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@ -1606,33 +1608,35 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
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u32 port_no;
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int err;
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err = -EINVAL;
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if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
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!a[OVS_VPORT_ATTR_UPCALL_PID])
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goto exit;
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return -EINVAL;
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port_no = a[OVS_VPORT_ATTR_PORT_NO]
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? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
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if (port_no >= DP_MAX_PORTS)
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return -EFBIG;
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reply = ovs_vport_cmd_alloc_info();
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if (!reply)
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return -ENOMEM;
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ovs_lock();
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dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
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err = -ENODEV;
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if (!dp)
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goto exit_unlock;
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if (a[OVS_VPORT_ATTR_PORT_NO]) {
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port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
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err = -EFBIG;
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if (port_no >= DP_MAX_PORTS)
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goto exit_unlock;
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goto exit_unlock_free;
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if (port_no) {
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vport = ovs_vport_ovsl(dp, port_no);
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err = -EBUSY;
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if (vport)
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goto exit_unlock;
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goto exit_unlock_free;
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} else {
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for (port_no = 1; ; port_no++) {
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if (port_no >= DP_MAX_PORTS) {
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err = -EFBIG;
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goto exit_unlock;
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goto exit_unlock_free;
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}
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vport = ovs_vport_ovsl(dp, port_no);
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if (!vport)
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@ -1650,22 +1654,19 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
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vport = new_vport(&parms);
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err = PTR_ERR(vport);
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if (IS_ERR(vport))
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goto exit_unlock;
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goto exit_unlock_free;
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err = 0;
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reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq,
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OVS_VPORT_CMD_NEW);
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if (IS_ERR(reply)) {
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err = PTR_ERR(reply);
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ovs_dp_detach_port(vport);
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goto exit_unlock;
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}
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err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
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info->snd_seq, 0, OVS_VPORT_CMD_NEW);
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BUG_ON(err < 0);
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ovs_unlock();
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ovs_notify(&dp_vport_genl_family, reply, info);
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return 0;
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exit_unlock:
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exit_unlock_free:
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ovs_unlock();
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exit:
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kfree_skb(reply);
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return err;
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}
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@ -1676,28 +1677,26 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
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struct vport *vport;
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int err;
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reply = ovs_vport_cmd_alloc_info();
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if (!reply)
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return -ENOMEM;
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ovs_lock();
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vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
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err = PTR_ERR(vport);
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if (IS_ERR(vport))
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goto exit_unlock;
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goto exit_unlock_free;
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if (a[OVS_VPORT_ATTR_TYPE] &&
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nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
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err = -EINVAL;
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goto exit_unlock;
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}
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reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!reply) {
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err = -ENOMEM;
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goto exit_unlock;
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goto exit_unlock_free;
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}
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if (a[OVS_VPORT_ATTR_OPTIONS]) {
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err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
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if (err)
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goto exit_free;
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goto exit_unlock_free;
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}
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if (a[OVS_VPORT_ATTR_UPCALL_PID])
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@ -1711,10 +1710,9 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
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ovs_notify(&dp_vport_genl_family, reply, info);
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return 0;
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exit_free:
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kfree_skb(reply);
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exit_unlock:
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exit_unlock_free:
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ovs_unlock();
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kfree_skb(reply);
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return err;
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}
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@ -1725,30 +1723,33 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
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struct vport *vport;
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int err;
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reply = ovs_vport_cmd_alloc_info();
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if (!reply)
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return -ENOMEM;
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ovs_lock();
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vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
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err = PTR_ERR(vport);
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if (IS_ERR(vport))
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goto exit_unlock;
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goto exit_unlock_free;
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if (vport->port_no == OVSP_LOCAL) {
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err = -EINVAL;
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goto exit_unlock;
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goto exit_unlock_free;
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}
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reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
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info->snd_seq, OVS_VPORT_CMD_DEL);
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err = PTR_ERR(reply);
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if (IS_ERR(reply))
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goto exit_unlock;
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err = 0;
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err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
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info->snd_seq, 0, OVS_VPORT_CMD_DEL);
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BUG_ON(err < 0);
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ovs_dp_detach_port(vport);
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ovs_unlock();
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ovs_notify(&dp_vport_genl_family, reply, info);
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return 0;
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exit_unlock:
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exit_unlock_free:
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ovs_unlock();
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kfree_skb(reply);
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return err;
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}
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@ -1760,24 +1761,25 @@ static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
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struct vport *vport;
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int err;
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reply = ovs_vport_cmd_alloc_info();
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if (!reply)
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return -ENOMEM;
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rcu_read_lock();
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vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
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err = PTR_ERR(vport);
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if (IS_ERR(vport))
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goto exit_unlock;
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reply = ovs_vport_cmd_build_info(vport, info->snd_portid,
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info->snd_seq, OVS_VPORT_CMD_NEW);
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err = PTR_ERR(reply);
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if (IS_ERR(reply))
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goto exit_unlock;
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goto exit_unlock_free;
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err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
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info->snd_seq, 0, OVS_VPORT_CMD_NEW);
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BUG_ON(err < 0);
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rcu_read_unlock();
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return genlmsg_reply(reply, info);
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exit_unlock:
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exit_unlock_free:
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rcu_read_unlock();
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kfree_skb(reply);
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return err;
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}
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