netdev - [PATCH v3 0/2] Fix thunderx MTU with XDP

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Date:   Thu, 11 Apr 2019 12:26:31 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Sunil Goutham <sgoutham@...ium.com>,
        Robert Richter <rric@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        David Miller <davem@...emloft.net>
Subject: [PATCH v3 0/2] Fix thunderx MTU with XDP

The thunderx driver can't use XDP with all MTU values.
This patches sets the right MTU values, and add a check to avoid setting
a wrong value which will not function.

v3: Fix a copy-paste from two functions, tested on proper hardware:

# ip link show dev enP2p1s0v0
2: enP2p1s0v0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 1c:1b:0d:0d:52:a4 brd ff:ff:ff:ff:ff:ff
# ip link set enP2p1s0v0 mtu 1800
# ip link set dev enP2p1s0v0 xdpdrv object mtu.o
[  787.019730] nicvf 0002:01:00.1 enP2p1s0v0: Jumbo frames not yet supported with XDP, current MTU 1800.
RTNETLINK answers: Operation not supported
# ip link set enP2p1s0v0 mtu 1500
# ip link set dev enP2p1s0v0 xdpdrv object mtu.o
[  800.574568] nicvf 0002:01:00.1 enP2p1s0v0: Link is Up 10000 Mbps Full duplex
# ip link set enP2p1s0v0 mtu 1600
[  807.248321] nicvf 0002:01:00.1 enP2p1s0v0: Jumbo frames not yet supported with XDP, current MTU 1500.
RTNETLINK answers: Invalid argument

Matteo Croce (2):
  net: thunderx: raise XDP MTU to 1508
  net: thunderx: don't allow jumbo frames with XDP

 .../net/ethernet/cavium/thunder/nicvf_main.c  | 22 +++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

-- 
2.21.0