openvswitch: Constify various function arguments

Help produce better optimized code.

Signed-off-by: Thomas Graf <tgraf@noironetworks.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

11 files changed, 38 insertions, 36 deletions

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 10c94ac969f4..394efa67934e 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -69,7 +69,7 @@ static void action_fifo_init(struct action_fifo *fifo)
         fifo->tail = 0;
 }
 
-static bool action_fifo_is_empty(struct action_fifo *fifo)
+static bool action_fifo_is_empty(const struct action_fifo *fifo)
 {
         return (fifo->head == fifo->tail);
 }
@@ -92,7 +92,7 @@ static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
 
 /* Return true if fifo is not full */
 static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
-                                                    struct sw_flow_key *key,
+                                                    const struct sw_flow_key *key,
                                                     const struct nlattr *attr)
 {
         struct action_fifo *fifo;
@@ -944,7 +944,8 @@ static void process_deferred_actions(struct datapath *dp)
 
 /* Execute a list of actions against 'skb'. */
 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
-                        struct sw_flow_actions *acts, struct sw_flow_key *key)
+                        const struct sw_flow_actions *acts,
+                        struct sw_flow_key *key)
 {
         int level = this_cpu_read(exec_actions_level);
         int err;
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 7146b38a954e..65561ebb489e 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -178,7 +178,7 @@ const char *ovs_dp_name(const struct datapath *dp)
         return vport->ops->get_name(vport);
 }
 
-static int get_dpifindex(struct datapath *dp)
+static int get_dpifindex(const struct datapath *dp)
 {
         struct vport *local;
         int ifindex;
@@ -633,7 +633,7 @@ static struct genl_family dp_packet_genl_family = {
         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 };
 
-static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
+static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
                          struct ovs_dp_megaflow_stats *mega_stats)
 {
         int i;
@@ -1352,7 +1352,7 @@ static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
 
 /* Called with rcu_read_lock or ovs_mutex. */
 static struct datapath *lookup_datapath(struct net *net,
-                                        struct ovs_header *ovs_header,
+                                        const struct ovs_header *ovs_header,
                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
 {
         struct datapath *dp;
@@ -1380,7 +1380,7 @@ static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *in
         dp->user_features = 0;
 }
 
-static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
+static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
 {
         if (a[OVS_DP_ATTR_USER_FEATURES])
                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
@@ -1744,7 +1744,7 @@ struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
 
 /* Called with ovs_mutex or RCU read lock. */
 static struct vport *lookup_vport(struct net *net,
-                                  struct ovs_header *ovs_header,
+                                  const struct ovs_header *ovs_header,
                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
 {
         struct datapath *dp;
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index 8de9f7e20ae9..8389c1d68e57 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -149,7 +149,7 @@ int lockdep_ovsl_is_held(void);
 #define rcu_dereference_ovsl(p)                                 \
         rcu_dereference_check(p, lockdep_ovsl_is_held())
 
-static inline struct net *ovs_dp_get_net(struct datapath *dp)
+static inline struct net *ovs_dp_get_net(const struct datapath *dp)
 {
         return read_pnet(&dp->net);
 }
@@ -192,7 +192,7 @@ struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
                                          u8 cmd);
 
 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
-                        struct sw_flow_actions *acts, struct sw_flow_key *);
+                        const struct sw_flow_actions *, struct sw_flow_key *);
 
 void ovs_dp_notify_wq(struct work_struct *work);
 
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 90a21010fc8f..25e9abcd51f1 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -66,7 +66,7 @@ u64 ovs_flow_used_time(unsigned long flow_jiffies)
 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
 
 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
-                           struct sk_buff *skb)
+                           const struct sk_buff *skb)
 {
         struct flow_stats *stats;
         int node = numa_node_id();
@@ -679,7 +679,7 @@ int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
         return key_extract(skb, key);
 }
 
-int ovs_flow_key_extract(struct ovs_tunnel_info *tun_info,
+int ovs_flow_key_extract(const struct ovs_tunnel_info *tun_info,
                          struct sk_buff *skb, struct sw_flow_key *key)
 {
         /* Extract metadata from packet. */
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 543b358ee57f..9e0a787c8627 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -53,7 +53,7 @@ struct ovs_key_ipv4_tunnel {
 
 struct ovs_tunnel_info {
         struct ovs_key_ipv4_tunnel tunnel;
-        struct geneve_opt *options;
+        const struct geneve_opt *options;
         u8 options_len;
 };
 
@@ -73,7 +73,7 @@ static inline void __ovs_flow_tun_info_init(struct ovs_tunnel_info *tun_info,
                                             __be16 tp_dst,
                                             __be64 tun_id,
                                             __be16 tun_flags,
-                                            struct geneve_opt *opts,
+                                            const struct geneve_opt *opts,
                                             u8 opts_len)
 {
         tun_info->tunnel.tun_id = tun_id;
@@ -105,7 +105,7 @@ static inline void ovs_flow_tun_info_init(struct ovs_tunnel_info *tun_info,
                                           __be16 tp_dst,
                                           __be64 tun_id,
                                           __be16 tun_flags,
-                                          struct geneve_opt *opts,
+                                          const struct geneve_opt *opts,
                                           u8 opts_len)
 {
         __ovs_flow_tun_info_init(tun_info, iph->saddr, iph->daddr,
@@ -244,14 +244,15 @@ struct arp_eth_header {
 } __packed;
 
 void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
-                           struct sk_buff *);
+                           const struct sk_buff *);
 void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
                         unsigned long *used, __be16 *tcp_flags);
 void ovs_flow_stats_clear(struct sw_flow *);
 u64 ovs_flow_used_time(unsigned long flow_jiffies);
 
 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
-int ovs_flow_key_extract(struct ovs_tunnel_info *tun_info, struct sk_buff *skb,
+int ovs_flow_key_extract(const struct ovs_tunnel_info *tun_info,
+                         struct sk_buff *skb,
                          struct sw_flow_key *key);
 /* Extract key from packet coming from userspace. */
 int ovs_flow_key_extract_userspace(const struct nlattr *attr,
diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
index 90f8b40a350b..e0a7fefc1edf 100644
--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -107,7 +107,7 @@ err:
         return ERR_PTR(-ENOMEM);
 }
 
-int ovs_flow_tbl_count(struct flow_table *table)
+int ovs_flow_tbl_count(const struct flow_table *table)
 {
         return table->count;
 }
@@ -401,7 +401,7 @@ static bool flow_cmp_masked_key(const struct sw_flow *flow,
 }
 
 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
-                               struct sw_flow_match *match)
+                               const struct sw_flow_match *match)
 {
         struct sw_flow_key *key = match->key;
         int key_start = flow_key_start(key);
@@ -412,7 +412,7 @@ bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
 
 static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
                                           const struct sw_flow_key *unmasked,
-                                          struct sw_flow_mask *mask)
+                                          const struct sw_flow_mask *mask)
 {
         struct sw_flow *flow;
         struct hlist_head *head;
@@ -460,7 +460,7 @@ struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
 }
 
 struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
-                                          struct sw_flow_match *match)
+                                          const struct sw_flow_match *match)
 {
         struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
         struct sw_flow_mask *mask;
@@ -563,7 +563,7 @@ static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl,
 
 /* Add 'mask' into the mask list, if it is not already there. */
 static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow,
-                            struct sw_flow_mask *new)
+                            const struct sw_flow_mask *new)
 {
         struct sw_flow_mask *mask;
         mask = flow_mask_find(tbl, new);
@@ -586,7 +586,7 @@ static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow,
 
 /* Must be called with OVS mutex held. */
 int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
-                        struct sw_flow_mask *mask)
+                        const struct sw_flow_mask *mask)
 {
         struct table_instance *new_ti = NULL;
         struct table_instance *ti;
diff --git a/net/openvswitch/flow_table.h b/net/openvswitch/flow_table.h
index f682c8c07f44..309fa6415689 100644
--- a/net/openvswitch/flow_table.h
+++ b/net/openvswitch/flow_table.h
@@ -61,12 +61,12 @@ struct sw_flow *ovs_flow_alloc(void);
 void ovs_flow_free(struct sw_flow *, bool deferred);
 
 int ovs_flow_tbl_init(struct flow_table *);
-int ovs_flow_tbl_count(struct flow_table *table);
+int ovs_flow_tbl_count(const struct flow_table *table);
 void ovs_flow_tbl_destroy(struct flow_table *table);
 int ovs_flow_tbl_flush(struct flow_table *flow_table);
 
 int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
-                        struct sw_flow_mask *mask);
+                        const struct sw_flow_mask *mask);
 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
 int  ovs_flow_tbl_num_masks(const struct flow_table *table);
 struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
@@ -77,9 +77,9 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *,
 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
                                     const struct sw_flow_key *);
 struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
-                                          struct sw_flow_match *match);
+                                          const struct sw_flow_match *match);
 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
-                               struct sw_flow_match *match);
+                               const struct sw_flow_match *match);
 
 void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
                        const struct sw_flow_mask *mask);
diff --git a/net/openvswitch/vport-geneve.c b/net/openvswitch/vport-geneve.c
index e31f19c922e2..347fa2325b22 100644
--- a/net/openvswitch/vport-geneve.c
+++ b/net/openvswitch/vport-geneve.c
@@ -68,7 +68,7 @@ static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
 }
 
 /* Convert 24 bit VNI to 64 bit tunnel ID. */
-static __be64 vni_to_tunnel_id(__u8 *vni)
+static __be64 vni_to_tunnel_id(const __u8 *vni)
 {
 #ifdef __BIG_ENDIAN
         return (vni[0] << 16) | (vni[1] << 8) | vni[2];
diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
index 877ee74b4f08..4776282c6417 100644
--- a/net/openvswitch/vport-netdev.c
+++ b/net/openvswitch/vport-netdev.c
@@ -77,7 +77,7 @@ static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
         return RX_HANDLER_CONSUMED;
 }
 
-static struct net_device *get_dpdev(struct datapath *dp)
+static struct net_device *get_dpdev(const struct datapath *dp)
 {
         struct vport *local;
 
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 630e81984b65..e771a46933e5 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -68,7 +68,7 @@ void ovs_vport_exit(void)
         kfree(dev_table);
 }
 
-static struct hlist_head *hash_bucket(struct net *net, const char *name)
+static struct hlist_head *hash_bucket(const struct net *net, const char *name)
 {
         unsigned int hash = jhash(name, strlen(name), (unsigned long) net);
         return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
@@ -107,7 +107,7 @@ EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister);
  *
  * Must be called with ovs or RCU read lock.
  */
-struct vport *ovs_vport_locate(struct net *net, const char *name)
+struct vport *ovs_vport_locate(const struct net *net, const char *name)
 {
         struct hlist_head *bucket = hash_bucket(net, name);
         struct vport *vport;
@@ -380,7 +380,7 @@ int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb)
  *
  * Must be called with ovs_mutex.
  */
-int ovs_vport_set_upcall_portids(struct vport *vport,  struct nlattr *ids)
+int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids)
 {
         struct vport_portids *old, *vport_portids;
 
@@ -471,7 +471,7 @@ u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb)
  * skb->data should point to the Ethernet header.
  */
 void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
-                       struct ovs_tunnel_info *tun_info)
+                       const struct ovs_tunnel_info *tun_info)
 {
         struct pcpu_sw_netstats *stats;
         struct sw_flow_key key;
diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
index 0635d1d761e9..99c8e71d9e6c 100644
--- a/net/openvswitch/vport.h
+++ b/net/openvswitch/vport.h
@@ -45,14 +45,14 @@ void ovs_vport_exit(void);
 struct vport *ovs_vport_add(const struct vport_parms *);
 void ovs_vport_del(struct vport *);
 
-struct vport *ovs_vport_locate(struct net *net, const char *name);
+struct vport *ovs_vport_locate(const struct net *net, const char *name);
 
 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
 
 int ovs_vport_set_options(struct vport *, struct nlattr *options);
 int ovs_vport_get_options(const struct vport *, struct sk_buff *);
 
-int ovs_vport_set_upcall_portids(struct vport *, struct nlattr *pids);
+int ovs_vport_set_upcall_portids(struct vport *, const struct nlattr *pids);
 int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *);
 u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *);
 
@@ -224,7 +224,7 @@ static inline struct vport *vport_from_priv(void *priv)
 }
 
 void ovs_vport_receive(struct vport *, struct sk_buff *,
-                       struct ovs_tunnel_info *);
+                       const struct ovs_tunnel_info *);
 
 static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
                                       const void *start, unsigned int len)