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xdp: add HW offload mode flag for installing programs

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Add an installation-time flag for requesting that the program
be installed only if it can be offloaded to HW.

Internally new command for ndo_xdp is added, this way we avoid
putting checks into drivers since they all return -EINVAL on
an unknown command.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-06-21 18:25:04 -07:00 • committed by David S. Miller
parent 32d602771b
commit ee5d032f7d
4 changed files with 13 additions and 6 deletions
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4
net/core/rtnetlink.c
View file

@ -16,6 +16,7 @@
* Vitaly E. Lavrov RTA_OK arithmetics was wrong.
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/types.h>
@ -2253,8 +2254,7 @@ static int do_setlink(const struct sk_buff *skb,
err = -EINVAL;
goto errout;
}
if ((xdp_flags & XDP_FLAGS_SKB_MODE) &&
(xdp_flags & XDP_FLAGS_DRV_MODE)) {
if (hweight32(xdp_flags & XDP_FLAGS_MODES) > 1) {
err = -EINVAL;
goto errout;
}