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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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7
net/core/dev.c
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@@ -6957,7 +6957,10 @@ static int dev_xdp_install(struct net_device *dev, xdp_op_t xdp_op,
struct netdev_xdp xdp;
memset(&xdp, 0, sizeof(xdp));
xdp.command = XDP_SETUP_PROG;
if (flags & XDP_FLAGS_HW_MODE)
xdp.command = XDP_SETUP_PROG_HW;
else
xdp.command = XDP_SETUP_PROG;
xdp.extack = extack;
xdp.flags = flags;
xdp.prog = prog;
@@ -6985,7 +6988,7 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
ASSERT_RTNL();
xdp_op = xdp_chk = ops->ndo_xdp;
if (!xdp_op && (flags & XDP_FLAGS_DRV_MODE))
if (!xdp_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE)))
return -EOPNOTSUPP;
if (!xdp_op || (flags & XDP_FLAGS_SKB_MODE))
xdp_op = generic_xdp_install;