Re: [dpdk-dev] [PATCH 2/2] net/vhost: insert/strip VLAN header in software

["Yao, Lei A" <lei.a.yao@intel.com>]

Hi, Jan

For this patch, I find it will break the VM2VM Iperf test as it clear
the of_flags. "bufs[i]->ol_flags = 0;"
Could you have a check on this?

The test step to reproduce this issue:
1. Lauch testpmd with two vhost-user port, using IO fwd mode
testpmd -c 0xe -n 4 --socket-mem 1024,1024 \
--legacy-mem --vdev 'eth_vhost0,iface=vhost-net,queues=1'  \
--vdev 'eth_vhost1,iface=vhost-net1,queues=1' --nb-cores=1 \
--tx-offloads=0x802a
2. Lauch 2 vms with virtio deivce
3. In the 2 vms, up the virtio device and run Iperf test between VMs
The test result show that the Iperf traffic is broken but ping test can pass.



> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Chas Williams
> Sent: Friday, March 30, 2018 12:05 AM
> To: dev@dpdk.org
> Cc: mtetsuyah@gmail.com; yliu@fridaylinux.org;
> maxime.coquelin@redhat.com; Jan Blunck <jblunck@infradead.org>
> Subject: [dpdk-dev] [PATCH 2/2] net/vhost: insert/strip VLAN header in
> software
> 
> From: Jan Blunck <jblunck@infradead.org>
> 
> This lets the vhost driver handle the VLAN header like the virtio driver
> in software.
> 
> Signed-off-by: Jan Blunck <jblunck@infradead.org>
> ---
>  drivers/net/vhost/rte_eth_vhost.c | 35
> ++++++++++++++++++++++++++++++++++-
>  1 file changed, 34 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/vhost/rte_eth_vhost.c
> b/drivers/net/vhost/rte_eth_vhost.c
> index 453d9bee1..0beb28e94 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -119,6 +119,7 @@ struct pmd_internal {
>  	uint16_t max_queues;
>  	rte_atomic32_t started;
>  	int vid;
> +	uint8_t vlan_strip;
>  };
> 
>  struct internal_list {
> @@ -422,6 +423,12 @@ eth_vhost_rx(void *q, struct rte_mbuf **bufs,
> uint16_t nb_bufs)
> 
>  	for (i = 0; likely(i < nb_rx); i++) {
>  		bufs[i]->port = r->port;
> +		bufs[i]->ol_flags = 0;
> +		bufs[i]->vlan_tci = 0;
> +
> +		if (r->internal->vlan_strip)
> +			rte_vlan_strip(bufs[i]);
> +
>  		r->stats.bytes += bufs[i]->pkt_len;
>  	}
> 
> @@ -438,7 +445,7 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs,
> uint16_t nb_bufs)
>  {
>  	struct vhost_queue *r = q;
>  	uint16_t i, nb_tx = 0;
> -	uint16_t nb_send = nb_bufs;
> +	uint16_t nb_send = 0;
> 
>  	if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
>  		return 0;
> @@ -448,6 +455,22 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs,
> uint16_t nb_bufs)
>  	if (unlikely(rte_atomic32_read(&r->allow_queuing) == 0))
>  		goto out;
> 
> +	for (i = 0; i < nb_bufs; i++) {
> +		struct rte_mbuf *m = bufs[i];
> +
> +		/* Do VLAN tag insertion */
> +		if (m->ol_flags & PKT_TX_VLAN_PKT) {
> +			int error = rte_vlan_insert(&m);
> +			if (unlikely(error)) {
> +				rte_pktmbuf_free(m);
> +				continue;
> +			}
> +		}
> +
> +		bufs[nb_send] = m;
> +		++nb_send;
> +	}
> +
>  	/* Enqueue packets to guest RX queue */
>  	while (nb_send) {
>  		uint16_t nb_pkts;
> @@ -489,6 +512,16 @@ eth_vhost_tx(void *q, struct rte_mbuf **bufs,
> uint16_t nb_bufs)
>  static int
>  eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
>  {
> +	struct pmd_internal *internal = dev->data->dev_private;
> +	const struct rte_eth_rxmode *rxmode = &dev->data-
> >dev_conf.rxmode;
> +
> +	internal->vlan_strip = rxmode->hw_vlan_strip;
> +
> +	if (rxmode->hw_vlan_filter)
> +		RTE_LOG(WARNING, PMD,
> +			"vhost(%s): vlan filtering not available\n",
> +			internal->dev_name);
> +
>  	return 0;
>  }
> 
> --
> 2.13.6