From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH v3 1/5] net/af_xdp: introduce AF XDP PMD
 driver
Date: Thu, 21 Mar 2019 08:27:05 -0700
Message-ID: <20190321082705.1ee71f1f@shemminger-XPS-13-9360>
References: <20190301080947.91086-1-xiaolong.ye@intel.com>
 <20190321091845.78495-1-xiaolong.ye@intel.com>
 <20190321091845.78495-2-xiaolong.ye@intel.com>
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Cc: dev@dpdk.org, Qi Zhang <qi.z.zhang@intel.com>, Karlsson Magnus
 <magnus.karlsson@intel.com>, Topel Bjorn <bjorn.topel@intel.com>
To: Xiaolong Ye <xiaolong.ye@intel.com>
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On Thu, 21 Mar 2019 17:18:41 +0800
Xiaolong Ye <xiaolong.ye@intel.com> wrote:

> static void kick_tx(struct pkt_tx_queue *txq)
> +{
> +	struct xsk_umem_info *umem = txq->pair->umem;
> +
> +	while (send(xsk_socket__fd(txq->pair->xsk), NULL,
> +		      0, MSG_DONTWAIT) < 0) {
> +		/* some thing unexpected */
> +		if (errno != EBUSY && errno != EAGAIN)
> +			break;
> +
> +		/* pull from complete qeueu to leave more space */
> +		if (errno == EAGAIN)
> +			pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
> +	}

What about EINTR??
You should retry the send then.