From: David S. Miller Date: Wed, 2 Sep 2015 04:19:17 +0000 (-0700) Subject: flow_dissector: Use 'const' where possible. X-Git-Tag: firefly_0821_release~176^2~1159^2~7 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=20a17bf6c04e3eca8824c930ecc55ab832558e3b;p=firefly-linux-kernel-4.4.55.git flow_dissector: Use 'const' where possible. Signed-off-by: David S. Miller --- diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index eabfb810bc62..2738d355cdf9 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1029,9 +1029,9 @@ static inline __u32 skb_get_hash(struct sk_buff *skb) return skb->hash; } -__u32 __skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6); +__u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6); -static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6) +static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6) { if (!skb->l4_hash && !skb->sw_hash) { struct flow_keys keys; @@ -1043,9 +1043,9 @@ static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6) return skb->hash; } -__u32 __skb_get_hash_flowi4(struct sk_buff *skb, struct flowi4 *fl); +__u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl); -static inline __u32 skb_get_hash_flowi4(struct sk_buff *skb, struct flowi4 *fl4) +static inline __u32 skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4) { if (!skb->l4_hash && !skb->sw_hash) { struct flow_keys keys; diff --git a/include/net/flow.h b/include/net/flow.h index dafe97c3c048..acd6a096250e 100644 --- a/include/net/flow.h +++ b/include/net/flow.h @@ -244,18 +244,18 @@ void flow_cache_flush(struct net *net); void flow_cache_flush_deferred(struct net *net); extern atomic_t flow_cache_genid; -__u32 __get_hash_from_flowi6(struct flowi6 *fl6, struct flow_keys *keys); +__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys); -static inline __u32 get_hash_from_flowi6(struct flowi6 *fl6) +static inline __u32 get_hash_from_flowi6(const struct flowi6 *fl6) { struct flow_keys keys; return __get_hash_from_flowi6(fl6, &keys); } -__u32 __get_hash_from_flowi4(struct flowi4 *fl4, struct flow_keys *keys); +__u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys); -static inline __u32 get_hash_from_flowi4(struct flowi4 *fl4) +static inline __u32 get_hash_from_flowi4(const struct flowi4 *fl4) { struct flow_keys keys; diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index 345a0408cfe4..d79699c9d1b9 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -19,14 +19,14 @@ #include #include -static bool skb_flow_dissector_uses_key(struct flow_dissector *flow_dissector, - enum flow_dissector_key_id key_id) +static bool dissector_uses_key(const struct flow_dissector *flow_dissector, + enum flow_dissector_key_id key_id) { return flow_dissector->used_keys & (1 << key_id); } -static void skb_flow_dissector_set_key(struct flow_dissector *flow_dissector, - enum flow_dissector_key_id key_id) +static void dissector_set_key(struct flow_dissector *flow_dissector, + enum flow_dissector_key_id key_id) { flow_dissector->used_keys |= (1 << key_id); } @@ -51,20 +51,20 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector, * boundaries of unsigned short. */ BUG_ON(key->offset > USHRT_MAX); - BUG_ON(skb_flow_dissector_uses_key(flow_dissector, - key->key_id)); + BUG_ON(dissector_uses_key(flow_dissector, + key->key_id)); - skb_flow_dissector_set_key(flow_dissector, key->key_id); + dissector_set_key(flow_dissector, key->key_id); flow_dissector->offset[key->key_id] = key->offset; } /* Ensure that the dissector always includes control and basic key. * That way we are able to avoid handling lack of these in fast path. */ - BUG_ON(!skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_CONTROL)); - BUG_ON(!skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_BASIC)); + BUG_ON(!dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_CONTROL)); + BUG_ON(!dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_BASIC)); } EXPORT_SYMBOL(skb_flow_dissector_init); @@ -154,8 +154,8 @@ bool __skb_flow_dissect(const struct sk_buff *skb, FLOW_DISSECTOR_KEY_BASIC, target_container); - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_ETH_ADDRS)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_ETH_ADDRS)) { struct ethhdr *eth = eth_hdr(skb); struct flow_dissector_key_eth_addrs *key_eth_addrs; @@ -178,8 +178,8 @@ ip: ip_proto = iph->protocol; - if (!skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_IPV4_ADDRS)) + if (!dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_IPV4_ADDRS)) break; key_addrs = skb_flow_dissector_target(flow_dissector, @@ -218,8 +218,8 @@ ipv6: ip_proto = iph->nexthdr; nhoff += sizeof(struct ipv6hdr); - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { struct flow_dissector_key_ipv6_addrs *key_ipv6_addrs; key_ipv6_addrs = skb_flow_dissector_target(flow_dissector, @@ -232,8 +232,8 @@ ipv6: flow_label = ip6_flowlabel(iph); if (flow_label) { - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_FLOW_LABEL)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_FLOW_LABEL)) { key_tags = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_FLOW_LABEL, target_container); @@ -257,8 +257,8 @@ ipv6: if (!vlan) goto out_bad; - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_VLANID)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_VLANID)) { key_tags = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_VLANID, target_container); @@ -298,8 +298,8 @@ ipv6: if (!hdr) goto out_bad; - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_TIPC_ADDRS)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_TIPC_ADDRS)) { key_addrs = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_TIPC_ADDRS, target_container); @@ -320,8 +320,8 @@ mpls: if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) { - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) { key_keyid = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_MPLS_ENTROPY, target_container); @@ -374,8 +374,8 @@ ip_proto_again: if (!keyid) goto out_bad; - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_GRE_KEYID)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_GRE_KEYID)) { key_keyid = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_GRE_KEYID, target_container); @@ -470,8 +470,8 @@ ip_proto_again: break; } - if (skb_flow_dissector_uses_key(flow_dissector, - FLOW_DISSECTOR_KEY_PORTS)) { + if (dissector_uses_key(flow_dissector, + FLOW_DISSECTOR_KEY_PORTS)) { key_ports = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_PORTS, target_container); @@ -497,18 +497,21 @@ static __always_inline void __flow_hash_secret_init(void) net_get_random_once(&hashrnd, sizeof(hashrnd)); } -static __always_inline u32 __flow_hash_words(u32 *words, u32 length, u32 keyval) +static __always_inline u32 __flow_hash_words(const u32 *words, u32 length, + u32 keyval) { return jhash2(words, length, keyval); } -static inline void *flow_keys_hash_start(struct flow_keys *flow) +static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow) { + const void *p = flow; + BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32)); - return (void *)flow + FLOW_KEYS_HASH_OFFSET; + return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET); } -static inline size_t flow_keys_hash_length(struct flow_keys *flow) +static inline size_t flow_keys_hash_length(const struct flow_keys *flow) { size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); @@ -598,7 +601,7 @@ static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval) __flow_hash_consistentify(keys); - hash = __flow_hash_words((u32 *)flow_keys_hash_start(keys), + hash = __flow_hash_words(flow_keys_hash_start(keys), flow_keys_hash_length(keys), keyval); if (!hash) hash = 1; @@ -677,7 +680,7 @@ __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb) } EXPORT_SYMBOL(skb_get_hash_perturb); -__u32 __skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6) +__u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6) { struct flow_keys keys; @@ -701,7 +704,7 @@ __u32 __skb_get_hash_flowi6(struct sk_buff *skb, struct flowi6 *fl6) } EXPORT_SYMBOL(__skb_get_hash_flowi6); -__u32 __skb_get_hash_flowi4(struct sk_buff *skb, struct flowi4 *fl4) +__u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4) { struct flow_keys keys; @@ -787,7 +790,7 @@ u32 skb_get_poff(const struct sk_buff *skb) return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); } -__u32 __get_hash_from_flowi6(struct flowi6 *fl6, struct flow_keys *keys) +__u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys) { memset(keys, 0, sizeof(*keys)); @@ -806,7 +809,7 @@ __u32 __get_hash_from_flowi6(struct flowi6 *fl6, struct flow_keys *keys) } EXPORT_SYMBOL(__get_hash_from_flowi6); -__u32 __get_hash_from_flowi4(struct flowi4 *fl4, struct flow_keys *keys) +__u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys) { memset(keys, 0, sizeof(*keys));