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[net-next,v11,09/13] net: add support for skbs with unreadable frags

Message ID 20240607005127.3078656-10-almasrymina@google.com
State New
Headers show
Series Device Memory TCP | expand

Commit Message

Mina Almasry June 7, 2024, 12:51 a.m. UTC 
For device memory TCP, we expect the skb headers to be available in host
memory for access, and we expect the skb frags to be in device memory
and unaccessible to the host. We expect there to be no mixing and
matching of device memory frags (unaccessible) with host memory frags
(accessible) in the same skb.

Add a skb->devmem flag which indicates whether the frags in this skb
are device memory frags or not.

__skb_fill_netmem_desc() now checks frags added to skbs for net_iov,
and marks the skb as skb->devmem accordingly.

Add checks through the network stack to avoid accessing the frags of
devmem skbs and avoid coalescing devmem skbs with non devmem skbs.

Signed-off-by: Willem de Bruijn <willemb@google.com>
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