netdev - [PATCH iproute2] iplink: document XDP subcommand to force the XDP mode.

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Message-Id: <20190213144030.15160-1-mcroce@redhat.com>
Date:   Wed, 13 Feb 2019 15:40:30 +0100
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org
Cc:     David Ahern <dsahern@...il.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH iproute2] iplink: document XDP subcommand to force the XDP mode.

When attaching an eBPF program to a device, ip link can force the XDP mode
by using the xdp{generic,drv,offload} keyword instead of just 'xdp'.
Document this behaviour also in the help output.

Signed-off-by: Matteo Croce <mcroce@...hat.com>
Fixes: 14683814 ("bpf: add xdpdrv for requesting XDP driver mode")
Fixes: 1b5e8094 ("bpf: allow requesting XDP HW offload")
---
 ip/iplink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ip/iplink.c b/ip/iplink.c
index b5519201..3a0cf459 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -98,7 +98,7 @@ void iplink_usage(void)
 		"				   [ trust { on | off} ] ]\n"
 		"				   [ node_guid { eui64 } ]\n"
 		"				   [ port_guid { eui64 } ]\n"
-		"			  [ xdp { off |\n"
+		"			  [ { xdp | xdpgeneric | xdpdrv | xdpoffload } { off |\n"
 		"				  object FILE [ section NAME ] [ verbose ] |\n"
 		"				  pinned FILE } ]\n"
 		"			  [ master DEVICE ][ vrf NAME ]\n"
-- 
2.20.1