[dpdk-stable] patch 'net/bonding: allow configuring jumbo frames without slaves' has been queued to stable release 17.02.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 17.02.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/28/17. So please
shout if anyone has objections.

Thanks.

	--yliu

---
>From 2fec0ef48c4ed30f4431cf0cb32f38cea3ddd788 Mon Sep 17 00:00:00 2001
From: Ilya Maximets <i.maximets at samsung.com>
Date: Fri, 7 Apr 2017 18:07:12 +0300
Subject: [PATCH] net/bonding: allow configuring jumbo frames without slaves

[ upstream commit c32c2c06bc82b3977b7d16d50a5d7cdcfc7b7e76 ]

Currently, 'rte_eth_dev_configure' fails on attempt to setup
max_rx_pkt_len > 2048 if no slaves was added to bonded device.

For example:

	rte_eth_dev_attach("eth_bond0,slave=05:00.0,mode=l34", &id)
	conf.rxmode.jumbo_frame = 1;
	conf.rxmode.max_rx_pkt_len = 9000;
	rte_eth_dev_configure(id, 1, 1, &conf)

Result:
	EAL: Initializing pmd_bond for eth_bond0
	EAL: Create bonded device eth_bond0 on port 4 in mode 2 on socket 0.
	rte_eth_dev_configure: ethdev port_id=4 \
		max_rx_pkt_len 9018 > max valid value 2048

It's expected that slaves will be added to bonded device inside
'rte_eth_dev_configure' and proper 'max_rx_pktlen' configured
for all of them.

Failure happens because of hardcoded low value of 'max_rx_pktlen'.
Increasing of this value to ETHER_MAX_JUMBO_FRAME_LEN will allow
above scenario (attach + configure).

It is important because it is the way OVS wants to work with
all DPDK devices (including virtual).
Changing the default hardcoded value makes no harm because
all the slaves' related code uses only 'candidate_max_rx_pktlen'
variable.

Fixes: 6cfc6a4f0d61 ("net/bonding: inherit maximum Rx packet length")

Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
Reviewed-by: Eric Kinzie <ehkinzie at gmail.com>
Acked-by: Declan Doherty <declan.doherty at intel.com>
---
 drivers/net/bonding/rte_eth_bond_pmd.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index f3ac9e2..8abcd07 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -1664,8 +1664,9 @@ bond_ethdev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 
 	dev_info->max_mac_addrs = 1;
 
-	dev_info->max_rx_pktlen = internals->candidate_max_rx_pktlen ?
-				  internals->candidate_max_rx_pktlen : 2048;
+	dev_info->max_rx_pktlen = internals->candidate_max_rx_pktlen
+				  ? internals->candidate_max_rx_pktlen
+				  : ETHER_MAX_JUMBO_FRAME_LEN;
 
 	dev_info->max_rx_queues = (uint16_t)128;
 	dev_info->max_tx_queues = (uint16_t)512;
-- 
1.9.0