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net: add get_netmem/put_netmem support

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Currently net_iovs support only pp ref counts, and do not support a
page ref equivalent.

This is fine for the RX path as net_iovs are used exclusively with the
pp and only pp refcounting is needed there. The TX path however does not
use pp ref counts, thus, support for get_page/put_page equivalent is
needed for netmem.

Support get_netmem/put_netmem. Check the type of the netmem before
passing it to page or net_iov specific code to obtain a page ref
equivalent.

For dmabuf net_iovs, we obtain a ref on the underlying binding. This
ensures the entire binding doesn't disappear until all the net_iovs have
been put_netmem'ed. We do not need to track the refcount of individual
dmabuf net_iovs as we don't allocate/free them from a pool similar to
what the buddy allocator does for pages.

This code is written to be extensible by other net_iov implementers.
get_netmem/put_netmem will check the type of the netmem and route it to
the correct helper:

pages -> [get|put]_page()
dmabuf net_iovs -> net_devmem_[get|put]_net_iov()
new net_iovs ->	new helpers

Signed-off-by: Mina Almasry <almasrymina@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250508004830.4100853-3-almasrymina@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Mina Almasry
2025-05-08 00:48:22 +00:00
committed by Paolo Abeni
parent 03e96b8c11
commit e9f3d61db5
5 changed files with 65 additions and 2 deletions
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10
net/core/devmem.c
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@@ -295,6 +295,16 @@ err_put_dmabuf:
return ERR_PTR(err);
}
void net_devmem_get_net_iov(struct net_iov *niov)
{
net_devmem_dmabuf_binding_get(net_devmem_iov_binding(niov));
}
void net_devmem_put_net_iov(struct net_iov *niov)
{
net_devmem_dmabuf_binding_put(net_devmem_iov_binding(niov));
}
/*** "Dmabuf devmem memory provider" ***/
int mp_dmabuf_devmem_init(struct page_pool *pool)