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net: add netmem to skb_frag_t

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Use struct netmem* instead of page in skb_frag_t. Currently struct
netmem* is always a struct page underneath, but the abstraction
allows efforts to add support for skb frags not backed by pages.

There is unfortunately 1 instance where the skb_frag_t is assumed to be
a exactly a bio_vec in kcm. For this case, WARN_ON_ONCE and return error
before doing a cast.

Add skb[_frag]_fill_netmem_*() and skb_add_rx_frag_netmem() helpers so
that the API can be used to create netmem skbs.

Signed-off-by: Mina Almasry <almasrymina@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Mina Almasry
2024-02-14 14:34:03 -08:00
committed by Paolo Abeni
parent 18ddbf5cf0
commit 21d2e6737c
3 changed files with 102 additions and 39 deletions
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7
net/kcm/kcmsock.c
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@@ -627,7 +627,8 @@ retry:
skb = txm->frag_skb;
}
if (WARN_ON(!skb_shinfo(skb)->nr_frags)) {
if (WARN_ON(!skb_shinfo(skb)->nr_frags) ||
WARN_ON_ONCE(!skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
ret = -EINVAL;
goto out;
}
@@ -637,8 +638,8 @@ retry:
msize += skb_frag_size(&skb_shinfo(skb)->frags[i]);
iov_iter_bvec(&msg.msg_iter, ITER_SOURCE,
skb_shinfo(skb)->frags, skb_shinfo(skb)->nr_frags,
msize);
(const struct bio_vec *)skb_shinfo(skb)->frags,
skb_shinfo(skb)->nr_frags, msize);
iov_iter_advance(&msg.msg_iter, txm->frag_offset);
do {