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net: Add skb_can_coalesce for netmem

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Allow drivers that have moved over to netmem to do fragment coalescing.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Link: https://patch.msgid.link/20250616141441.1243044-3-mbloch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dragos Tatulea
2025-06-16 17:14:31 +03:00
committed by Jakub Kicinski
parent c9e1225352
commit 1cbb49f85b
1 changed files with 9 additions and 3 deletions
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12
include/linux/skbuff.h
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@@ -3873,20 +3873,26 @@ static inline int __must_check skb_put_padto(struct sk_buff *skb, unsigned int l
bool csum_and_copy_from_iter_full(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i)
__must_check;
static inline bool skb_can_coalesce(struct sk_buff *skb, int i,
const struct page *page, int off)
static inline bool skb_can_coalesce_netmem(struct sk_buff *skb, int i,
netmem_ref netmem, int off)
{
if (skb_zcopy(skb))
return false;
if (i) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
return page == skb_frag_page(frag) &&
return netmem == skb_frag_netmem(frag) &&
off == skb_frag_off(frag) + skb_frag_size(frag);
}
return false;
}
static inline bool skb_can_coalesce(struct sk_buff *skb, int i,
const struct page *page, int off)
{
return skb_can_coalesce_netmem(skb, i, page_to_netmem(page), off);
}
static inline int __skb_linearize(struct sk_buff *skb)
{
return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM;