[dpdk-dev] [PATCH v2] net/ixgbe: initialize port even if mtu config fails

[Tudor Cornea <tudor.cornea@gmail.com>]

On a VMware ESXi 6.0 setup with an Intel 82599 NIC the ports don't
seem to initialize anymore, while running testpmd.

Configuring Port 0 (socket 0)
ixgbevf_dev_rx_init(): Set max packet length to 1518 failed.
ixgbevf_dev_start(): Unable to initialize RX hardware (-22)
Fail to start port 0: Invalid argument
Configuring Port 1 (socket 0)
ixgbevf_dev_rx_init(): Set max packet length to 1518 failed.
ixgbevf_dev_start(): Unable to initialize RX hardware (-22)
Fail to start port 1: Invalid argument
Please stop the ports first

If the call to ixgbevf_rlpml_set_vf fails and we return prematurely,
we will not be able to initialize the ports correctly.

The behavior seems to have changed since the following commit:

commit c77866a16904 ("net/ixgbe: detect failed VF MTU set")

We can make this particular use case work correctly if we don't
return an error, which seems to be consistent with the overall
kernel ixgbevf implementation.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c#n2015

Signed-off-by: Tudor Cornea <tudor.cornea@gmail.com>

---
v2:
* Change title
* Remove max_rx_pkt_len fix in ixgbe_ethdev.c
  It's already fixed as part of Ferruh's changes in next-net branch,
  so this part should be redundant, now
---
 drivers/net/ixgbe/ixgbe_rxtx.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index b263dfe..a51450f 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -5673,11 +5673,9 @@ ixgbevf_dev_rx_init(struct rte_eth_dev *dev)
 	 * ixgbevf_rlpml_set_vf even if jumbo frames are not used. This way,
 	 * VF packets received can work in all cases.
 	 */
-	if (ixgbevf_rlpml_set_vf(hw, frame_size) != 0) {
+	if (ixgbevf_rlpml_set_vf(hw, frame_size) != 0)
 		PMD_INIT_LOG(ERR, "Set max packet length to %d failed.",
 			     frame_size);
-		return -EINVAL;
-	}
 
 	/*
 	 * Assume no header split and no VLAN strip support
-- 
2.7.4