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esp4: Avoid skb_cow_data whenever possible

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This patch tries to avoid skb_cow_data on esp4.

On the encrypt side we add the IPsec tailbits
to the linear part of the buffer if there is
space on it. If there is no space on the linear
part, we add a page fragment with the tailbits to
the buffer and use separate src and dst scatterlists.

On the decrypt side, we leave the buffer as it is
if it is not cloned.

With this, we can avoid a linearization of the buffer
in most of the cases.

Joint work with:
Sowmini Varadhan <sowmini.varadhan@oracle.com>
Ilan Tayari <ilant@mellanox.com>

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Ilan Tayari <ilant@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2017-01-17 10:22:57 +01:00
parent 726282aa6b
commit cac2661c53
2 changed files with 267 additions and 75 deletions
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2
include/net/xfrm.h
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@ -213,6 +213,8 @@ struct xfrm_state {
/* Last used time */
unsigned long lastused;
struct page_frag xfrag;
/* Reference to data common to all the instances of this
* transformer. */
const struct xfrm_type *type;