On Wed, 25 Nov 2015 10:32:33 +0000
"Montorsi, Francesco" <fmontorsi at empirix.com> wrote:
> Hi all,
> I have a server running VMWare ESXi 5.5.0 and VMWare vCenter 5.5.0. On such
> server I created a VM with two VMXNET3 NIC cards (one for management, the
> other one should be used with DPDK to enable fast-RX of packets coming from
> other VMs / bare-metal NICs).
>
> Inside the VM I have successfully created 2MB hugepages, loaded igb_uio
> driver and binded the 2nd VMXNET3 NIC to igb_uio driver:
>
> ----------------------------------------------------------------------------------------------------------------------
> $ ./dpdk_nic_bind.py --status
>
> Network devices using DPDK-compatible driver
> ============================================
> 0000:0b:00.0 'VMXNET3 Ethernet Controller' drv=igb_uio unused=vmxnet3
>
> Network devices using kernel driver
> ===================================
> 0000:03:00.0 'VMXNET3 Ethernet Controller' if=eth0 drv=vmxnet3 unused=igb_uio
> *Active*
>
> Other network devices
> =====================
> <none>
> ----------------------------------------------------------------------------------------------------------------------
>
> However when I start my DPDK-application I get the following error during TX
> queue initialization:
>
> ERR rte_eth_tx_queue_setup: err=-22, port=0: Unknown error -22
>
> This is the code that I'm using:
>
> ...
> rte_eth_dev_info_get(m_portid, m_dev_info);
>
>
> // proceed with configuration
>
> struct rte_eth_conf port_conf;
> memset(&port_conf, 0, sizeof(port_conf));
>
> port_conf.rxmode.mq_mode = ETH_MQ_RX_RSS;
> /** The multi-queue packet distribution mode to be used, e.g.
> RSS.; this is important to use multiple RX queues per port ID */
> port_conf.rxmode.max_rx_pkt_len = ETHER_MAX_LEN;
> port_conf.rxmode.hw_strip_crc = 1; /**< enable CRC stripping by
> hardware */
> port_conf.rxmode.jumbo_frame = 1; /**< Jumbo Frame Support enabled */
> //port_conf.rxmode.enable_lro = 1; /**< Enable LRO */
> // NOT SUPPORTED ON TESTED HW
> port_conf.rx_adv_conf.rss_conf.rss_hf = ETH_RSS_IP;
> port_conf.txmode.mq_mode = ETH_MQ_TX_NONE;
>
> m_num_queues = MIN(64, m_dev_info->max_rx_queues);
> m_num_queues = MIN(128, m_num_queues);
> ret = rte_eth_dev_configure(m_portid, m_num_queues, 1 /* number of tx
> queues */, &port_conf);
> if (ret < 0)
> {
> HMLogError("HwEmulDPDKPort::init() rte_eth_dev_configure:
> err=%d, port=%u: %s", ret, m_portid, rte_strerror(ret));
> return false;
> }
>
> // init one TX queue: even if we never ever TX packets, at least 1
> queue is needed!
> ---> ret = rte_eth_tx_queue_setup(m_portid, 0 /* queue ID */, 64 /* num
> descriptors */, rte_eth_dev_socket_id(m_portid), NULL);
> if (ret < 0)
> {
> // retry with just 1 descriptor
>
> ---> ret = rte_eth_tx_queue_setup(m_portid, 0 /* queue ID */, 1 /*
> num descriptors */, rte_eth_dev_socket_id(m_portid), NULL);
> if (ret < 0)
> {
> HMLogError("HwEmulDPDKPort::init()
> rte_eth_tx_queue_setup: err=%d, port=%u: %s", ret, m_portid,
> rte_strerror(ret));
> return false;
> }
> }
>
>
> Basically since I want to only receive packets (no TX) I'm not really
> interested in TX queues / num of TX descriptors... However I have troubles
> decrypting this -22 error code... any hint?
First advice, DPDK is open source, therefore you have the source use it.
Error codes match Linux/Unix errno's. You can use strerror(-ret) to find the
value
or look in errno.h. Hint -22 == EINVAL
If you read the source, you will see that it there are log messages enabled if
you
configure with LIBRTE_ETHDEV_DEBUG enabled and rebuild DPDK. And there are log
messages
for VMXNETE3 controlled by LIBRTE_VMXNET3_DEBUG_INIT
