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net: constify skbuff and Qdisc elements 

Preliminary patch before tcp constification

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-10-20 17:45:43 -04:00 committed by David S. Miller
parent 20c4cb792d
commit 05bdd2f143
2 changed files with 21 additions and 20 deletions
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17
include/linux/skbuff.h
View File

@ -853,9 +853,9 @@ static inline struct sk_buff *skb_unshare(struct sk_buff *skb,
* The reference count is not incremented and the reference is therefore
* volatile. Use with caution.
*/
static inline struct sk_buff *skb_peek(struct sk_buff_head *list_)
static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_)
{
struct sk_buff *list = ((struct sk_buff *)list_)->next;
struct sk_buff *list = ((const struct sk_buff *)list_)->next;
if (list == (struct sk_buff *)list_)
list = NULL;
return list;
@ -874,9 +874,9 @@ static inline struct sk_buff *skb_peek(struct sk_buff_head *list_)
* The reference count is not incremented and the reference is therefore
* volatile. Use with caution.
*/
static inline struct sk_buff *skb_peek_tail(struct sk_buff_head *list_)
static inline struct sk_buff *skb_peek_tail(const struct sk_buff_head *list_)
{
struct sk_buff *list = ((struct sk_buff *)list_)->prev;
struct sk_buff *list = ((const struct sk_buff *)list_)->prev;
if (list == (struct sk_buff *)list_)
list = NULL;
return list;
@ -1830,7 +1830,7 @@ static inline dma_addr_t skb_frag_dma_map(struct device *dev,
* Returns true if modifying the header part of the cloned buffer
* does not requires the data to be copied.
*/
static inline int skb_clone_writable(struct sk_buff *skb, unsigned int len)
static inline int skb_clone_writable(const struct sk_buff *skb, unsigned int len)
{
return !skb_header_cloned(skb) &&
skb_headroom(skb) + len <= skb->hdr_len;
@ -2451,7 +2451,8 @@ static inline bool skb_warn_if_lro(const struct sk_buff *skb)
{
/* LRO sets gso_size but not gso_type, whereas if GSO is really
* wanted then gso_type will be set. */
struct skb_shared_info *shinfo = skb_shinfo(skb);
const struct skb_shared_info *shinfo = skb_shinfo(skb);
if (skb_is_nonlinear(skb) && shinfo->gso_size != 0 &&
unlikely(shinfo->gso_type == 0)) {
__skb_warn_lro_forwarding(skb);
@ -2475,7 +2476,7 @@ static inline void skb_forward_csum(struct sk_buff *skb)
* Instead of forcing ip_summed to CHECKSUM_NONE, we can
* use this helper, to document places where we make this assertion.
*/
static inline void skb_checksum_none_assert(struct sk_buff *skb)
static inline void skb_checksum_none_assert(const struct sk_buff *skb)
{
#ifdef DEBUG
BUG_ON(skb->ip_summed != CHECKSUM_NONE);
@ -2484,7 +2485,7 @@ static inline void skb_checksum_none_assert(struct sk_buff *skb)
bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off);
static inline bool skb_is_recycleable(struct sk_buff *skb, int skb_size)
static inline bool skb_is_recycleable(const struct sk_buff *skb, int skb_size)
{
if (irqs_disabled())
return false;

24
include/net/sch_generic.h
View File

@ -46,14 +46,14 @@ struct qdisc_size_table {
struct Qdisc {
int (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
struct sk_buff * (*dequeue)(struct Qdisc *dev);
unsigned flags;
unsigned int flags;
#define TCQ_F_BUILTIN 1
#define TCQ_F_INGRESS 2
#define TCQ_F_CAN_BYPASS 4
#define TCQ_F_MQROOT 8
#define TCQ_F_WARN_NONWC (1 << 16)
int padded;
struct Qdisc_ops *ops;
const struct Qdisc_ops *ops;
struct qdisc_size_table __rcu *stab;
struct list_head list;
u32 handle;
@ -224,7 +224,7 @@ struct qdisc_skb_cb {
long data[];
};
static inline int qdisc_qlen(struct Qdisc *q)
static inline int qdisc_qlen(const struct Qdisc *q)
{
return q->q.qlen;
}
@ -239,12 +239,12 @@ static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
return &qdisc->q.lock;
}
static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
static inline struct Qdisc *qdisc_root(const struct Qdisc *qdisc)
{
return qdisc->dev_queue->qdisc;
}
static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
{
return qdisc->dev_queue->qdisc_sleeping;
}
@ -260,7 +260,7 @@ static inline struct Qdisc *qdisc_root_sleeping(struct Qdisc *qdisc)
* root. This is enforced by holding the RTNL semaphore, which
* all users of this lock accessor must do.
*/
static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
{
struct Qdisc *root = qdisc_root(qdisc);
@ -268,7 +268,7 @@ static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
return qdisc_lock(root);
}
static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
{
struct Qdisc *root = qdisc_root_sleeping(qdisc);
@ -276,17 +276,17 @@ static inline spinlock_t *qdisc_root_sleeping_lock(struct Qdisc *qdisc)
return qdisc_lock(root);
}
static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
{
return qdisc->dev_queue->dev;
}
static inline void sch_tree_lock(struct Qdisc *q)
static inline void sch_tree_lock(const struct Qdisc *q)
{
spin_lock_bh(qdisc_root_sleeping_lock(q));
}
static inline void sch_tree_unlock(struct Qdisc *q)
static inline void sch_tree_unlock(const struct Qdisc *q)
{
spin_unlock_bh(qdisc_root_sleeping_lock(q));
}
@ -319,7 +319,7 @@ static inline unsigned int qdisc_class_hash(u32 id, u32 mask)
}
static inline struct Qdisc_class_common *
qdisc_class_find(struct Qdisc_class_hash *hash, u32 id)
qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
{
struct Qdisc_class_common *cl;
struct hlist_node *n;
@ -393,7 +393,7 @@ static inline bool qdisc_all_tx_empty(const struct net_device *dev)
}
/* Are any of the TX qdiscs changing? */
static inline bool qdisc_tx_changing(struct net_device *dev)
static inline bool qdisc_tx_changing(const struct net_device *dev)
{
unsigned int i;
for (i = 0; i < dev->num_tx_queues; i++) {