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From: Yotam Rubin <yotam@weka.io>
Date: Tue, 12 May 2015 13:32:46 +0300
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Subject: [dpdk-dev] ixgbevf TX hang
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Hello,

   We're using dpdk with with the ixgbevf driver on an AWS (Xen hypervisor)
instance. We use the NIC to drive jumbo packets at high throughput.
Occasionally, the vf experiences a non-recoverable TX hang. Specifically,
all descriptors in the TX queue are used up - and remain in this state. All
descriptors' writeback status don't have the IXGBE_TXD_STAT_DD set.

After resetting the port, TX no longer hangs.

We're using the suggested TX conf for the 82599:

static struct rte_eth_txconf tx_conf = {
        .tx_thresh = {
                .pthresh = 36,  /* Ring prefetch threshold */
                .hthresh = 0,   /* Ring host threshold */
                .wthresh = 0,   /* Ring writeback threshold */
        },
        .tx_free_thresh = 0,    /* Use PMD default values */
        .tx_rs_thresh = 0,    /* Use PMD default values */
};

Any ideas?

Thanks,
  Yotam