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Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r--net/core/skbuff.c105
1 files changed, 45 insertions, 60 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 56ba3c4e476..104f8444754 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -202,8 +202,6 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
skb->data = data;
skb_reset_tail_pointer(skb);
skb->end = skb->tail + size;
- kmemcheck_annotate_bitfield(skb, flags1);
- kmemcheck_annotate_bitfield(skb, flags2);
#ifdef NET_SKBUFF_DATA_USES_OFFSET
skb->mac_header = ~0U;
#endif
@@ -249,10 +247,9 @@ EXPORT_SYMBOL(__alloc_skb);
struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
unsigned int length, gfp_t gfp_mask)
{
- int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
struct sk_buff *skb;
- skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, node);
+ skb = __alloc_skb(length + NET_SKB_PAD, gfp_mask, 0, NUMA_NO_NODE);
if (likely(skb)) {
skb_reserve(skb, NET_SKB_PAD);
skb->dev = dev;
@@ -261,16 +258,6 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
}
EXPORT_SYMBOL(__netdev_alloc_skb);
-struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
-{
- int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
- struct page *page;
-
- page = alloc_pages_node(node, gfp_mask, 0);
- return page;
-}
-EXPORT_SYMBOL(__netdev_alloc_page);
-
void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
int size)
{
@@ -340,7 +327,7 @@ static void skb_release_data(struct sk_buff *skb)
put_page(skb_shinfo(skb)->frags[i].page);
}
- if (skb_has_frags(skb))
+ if (skb_has_frag_list(skb))
skb_drop_fraglist(skb);
kfree(skb->head);
@@ -686,16 +673,10 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t gfp_mask)
{
- int headerlen = skb->data - skb->head;
- /*
- * Allocate the copy buffer
- */
- struct sk_buff *n;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
- n = alloc_skb(skb->end + skb->data_len, gfp_mask);
-#else
- n = alloc_skb(skb->end - skb->head + skb->data_len, gfp_mask);
-#endif
+ int headerlen = skb_headroom(skb);
+ unsigned int size = (skb_end_pointer(skb) - skb->head) + skb->data_len;
+ struct sk_buff *n = alloc_skb(size, gfp_mask);
+
if (!n)
return NULL;
@@ -727,20 +708,14 @@ EXPORT_SYMBOL(skb_copy);
struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
{
- /*
- * Allocate the copy buffer
- */
- struct sk_buff *n;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
- n = alloc_skb(skb->end, gfp_mask);
-#else
- n = alloc_skb(skb->end - skb->head, gfp_mask);
-#endif
+ unsigned int size = skb_end_pointer(skb) - skb->head;
+ struct sk_buff *n = alloc_skb(size, gfp_mask);
+
if (!n)
goto out;
/* Set the data pointer */
- skb_reserve(n, skb->data - skb->head);
+ skb_reserve(n, skb_headroom(skb));
/* Set the tail pointer and length */
skb_put(n, skb_headlen(skb));
/* Copy the bytes */
@@ -760,7 +735,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask)
skb_shinfo(n)->nr_frags = i;
}
- if (skb_has_frags(skb)) {
+ if (skb_has_frag_list(skb)) {
skb_shinfo(n)->frag_list = skb_shinfo(skb)->frag_list;
skb_clone_fraglist(n);
}
@@ -792,12 +767,9 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
{
int i;
u8 *data;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
- int size = nhead + skb->end + ntail;
-#else
- int size = nhead + (skb->end - skb->head) + ntail;
-#endif
+ int size = nhead + (skb_end_pointer(skb) - skb->head) + ntail;
long off;
+ bool fastpath;
BUG_ON(nhead < 0);
@@ -811,23 +783,36 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
goto nodata;
/* Copy only real data... and, alas, header. This should be
- * optimized for the cases when header is void. */
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
- memcpy(data + nhead, skb->head, skb->tail);
-#else
- memcpy(data + nhead, skb->head, skb->tail - skb->head);
-#endif
- memcpy(data + size, skb_end_pointer(skb),
+ * optimized for the cases when header is void.
+ */
+ memcpy(data + nhead, skb->head, skb_tail_pointer(skb) - skb->head);
+
+ memcpy((struct skb_shared_info *)(data + size),
+ skb_shinfo(skb),
offsetof(struct skb_shared_info, frags[skb_shinfo(skb)->nr_frags]));
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
- get_page(skb_shinfo(skb)->frags[i].page);
+ /* Check if we can avoid taking references on fragments if we own
+ * the last reference on skb->head. (see skb_release_data())
+ */
+ if (!skb->cloned)
+ fastpath = true;
+ else {
+ int delta = skb->nohdr ? (1 << SKB_DATAREF_SHIFT) + 1 : 1;
- if (skb_has_frags(skb))
- skb_clone_fraglist(skb);
+ fastpath = atomic_read(&skb_shinfo(skb)->dataref) == delta;
+ }
- skb_release_data(skb);
+ if (fastpath) {
+ kfree(skb->head);
+ } else {
+ for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
+ get_page(skb_shinfo(skb)->frags[i].page);
+ if (skb_has_frag_list(skb))
+ skb_clone_fraglist(skb);
+
+ skb_release_data(skb);
+ }
off = (data + nhead) - skb->head;
skb->head = data;
@@ -1100,7 +1085,7 @@ drop_pages:
for (; i < nfrags; i++)
put_page(skb_shinfo(skb)->frags[i].page);
- if (skb_has_frags(skb))
+ if (skb_has_frag_list(skb))
skb_drop_fraglist(skb);
goto done;
}
@@ -1195,7 +1180,7 @@ unsigned char *__pskb_pull_tail(struct sk_buff *skb, int delta)
/* Optimization: no fragments, no reasons to preestimate
* size of pulled pages. Superb.
*/
- if (!skb_has_frags(skb))
+ if (!skb_has_frag_list(skb))
goto pull_pages;
/* Estimate size of pulled pages. */
@@ -2324,7 +2309,7 @@ next_skb:
st->frag_data = NULL;
}
- if (st->root_skb == st->cur_skb && skb_has_frags(st->root_skb)) {
+ if (st->root_skb == st->cur_skb && skb_has_frag_list(st->root_skb)) {
st->cur_skb = skb_shinfo(st->root_skb)->frag_list;
st->frag_idx = 0;
goto next_skb;
@@ -2894,7 +2879,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
return -ENOMEM;
/* Easy case. Most of packets will go this way. */
- if (!skb_has_frags(skb)) {
+ if (!skb_has_frag_list(skb)) {
/* A little of trouble, not enough of space for trailer.
* This should not happen, when stack is tuned to generate
* good frames. OK, on miss we reallocate and reserve even more
@@ -2929,7 +2914,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
if (skb1->next == NULL && tailbits) {
if (skb_shinfo(skb1)->nr_frags ||
- skb_has_frags(skb1) ||
+ skb_has_frag_list(skb1) ||
skb_tailroom(skb1) < tailbits)
ntail = tailbits + 128;
}
@@ -2938,7 +2923,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
skb_cloned(skb1) ||
ntail ||
skb_shinfo(skb1)->nr_frags ||
- skb_has_frags(skb1)) {
+ skb_has_frag_list(skb1)) {
struct sk_buff *skb2;
/* Fuck, we are miserable poor guys... */
@@ -3021,7 +3006,7 @@ void skb_tstamp_tx(struct sk_buff *orig_skb,
} else {
/*
* no hardware time stamps available,
- * so keep the skb_shared_tx and only
+ * so keep the shared tx_flags and only
* store software time stamp
*/
skb->tstamp = ktime_get_real();
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-04 10:01:03 +0000