From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Marvin Liu <yong.liu@intel.com>, tiwei.bie@intel.com
Cc: zhihong.wang@intel.com, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v5 8/9] net/virtio: add in-order Rx/Tx into selection
Date: Mon, 2 Jul 2018 13:24:07 +0200 [thread overview]
Message-ID: <8bc6e2e3-055d-2cb4-320d-ba14184c7522@redhat.com> (raw)
In-Reply-To: <20180702135642.52577-9-yong.liu@intel.com>
On 07/02/2018 03:56 PM, Marvin Liu wrote:
> After IN_ORDER Rx/Tx paths added, need to update Rx/Tx path selection
> logic.
>
> Rx path select logic: If IN_ORDER and merge-able are enabled will select
> IN_ORDER Rx path. If IN_ORDER is enabled, Rx offload and merge-able are
> disabled will select simple Rx path. Otherwise will select normal Rx
> path.
>
> Tx path select logic: If IN_ORDER is enabled will select IN_ORDER Tx
> path. Otherwise will select default Tx path.
>
> Signed-off-by: Marvin Liu <yong.liu@intel.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>
> diff --git a/doc/guides/nics/virtio.rst b/doc/guides/nics/virtio.rst
> index 46e292c4d..7c099fb7c 100644
> --- a/doc/guides/nics/virtio.rst
> +++ b/doc/guides/nics/virtio.rst
> @@ -201,7 +201,7 @@ The packet transmission flow is:
> Virtio PMD Rx/Tx Callbacks
> --------------------------
>
> -Virtio driver has 3 Rx callbacks and 2 Tx callbacks.
> +Virtio driver has 4 Rx callbacks and 3 Tx callbacks.
>
> Rx callbacks:
>
> @@ -215,6 +215,9 @@ Rx callbacks:
> Vector version without mergeable Rx buffer support, also fixes the available
> ring indexes and uses vector instructions to optimize performance.
>
> +#. ``virtio_recv_mergeable_pkts_inorder``:
> + In-order version with mergeable Rx buffer support.
> +
> Tx callbacks:
>
> #. ``virtio_xmit_pkts``:
> @@ -223,6 +226,8 @@ Tx callbacks:
> #. ``virtio_xmit_pkts_simple``:
> Vector version fixes the available ring indexes to optimize performance.
>
> +#. ``virtio_xmit_pkts_inorder``:
> + In-order version.
>
> By default, the non-vector callbacks are used:
>
> @@ -254,6 +259,12 @@ Example of using the vector version of the virtio poll mode driver in
>
> testpmd -l 0-2 -n 4 -- -i --tx-offloads=0x0 --rxq=1 --txq=1 --nb-cores=1
>
> +In-order callbacks only work on simulated virtio user vdev.
> +
> +* For Rx: If mergeable Rx buffers is enabled and in-order is enabled then
> + ``virtio_xmit_pkts_inorder`` is used.
> +
> +* For Tx: If in-order is enabled then ``virtio_xmit_pkts_inorder`` is used.
>
> Interrupt mode
> --------------
> diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
> index df50a571a..df7981ddb 100644
> --- a/drivers/net/virtio/virtio_ethdev.c
> +++ b/drivers/net/virtio/virtio_ethdev.c
> @@ -1320,6 +1320,11 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
> PMD_INIT_LOG(INFO, "virtio: using simple Rx path on port %u",
> eth_dev->data->port_id);
> eth_dev->rx_pkt_burst = virtio_recv_pkts_vec;
> + } else if (hw->use_inorder_rx) {
> + PMD_INIT_LOG(INFO,
> + "virtio: using inorder mergeable buffer Rx path on port %u",
> + eth_dev->data->port_id);
> + eth_dev->rx_pkt_burst = &virtio_recv_mergeable_pkts_inorder;
> } else if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
> PMD_INIT_LOG(INFO,
> "virtio: using mergeable buffer Rx path on port %u",
> @@ -1335,6 +1340,10 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
> PMD_INIT_LOG(INFO, "virtio: using simple Tx path on port %u",
> eth_dev->data->port_id);
> eth_dev->tx_pkt_burst = virtio_xmit_pkts_simple;
> + } else if (hw->use_inorder_tx) {
> + PMD_INIT_LOG(INFO, "virtio: using inorder Tx path on port %u",
> + eth_dev->data->port_id);
> + eth_dev->tx_pkt_burst = virtio_xmit_pkts_inorder;
> } else {
> PMD_INIT_LOG(INFO, "virtio: using standard Tx path on port %u",
> eth_dev->data->port_id);
> @@ -1874,20 +1883,27 @@ virtio_dev_configure(struct rte_eth_dev *dev)
> hw->use_simple_rx = 1;
> hw->use_simple_tx = 1;
>
> + if (vtpci_with_feature(hw, VIRTIO_F_IN_ORDER)) {
> + /* Simple Tx not compatible with in-order ring */
> + hw->use_inorder_tx = 1;
> + hw->use_simple_tx = 0;
> + if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
> + hw->use_inorder_rx = 1;
> + hw->use_simple_rx = 0;
> + } else {
> + hw->use_inorder_rx = 0;
> + if (rx_offloads & (DEV_RX_OFFLOAD_UDP_CKSUM |
> + DEV_RX_OFFLOAD_TCP_CKSUM))
> + hw->use_simple_rx = 0;
It is applied, but I think this is still not good.
Simple Rx is set to 1 by default, so if IN_ORDER isn't negotiated,
and UDP/TCP_CSUM is enabled, simple Rx keeps being selected.
I'll fix it in my series that I'm doing on top.
Regards,
Maxime
> + }
> + }
> +
> #if defined RTE_ARCH_ARM64 || defined RTE_ARCH_ARM
> if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON)) {
> hw->use_simple_rx = 0;
> hw->use_simple_tx = 0;
> }
> #endif
> - if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
> - hw->use_simple_rx = 0;
> - hw->use_simple_tx = 0;
> - }
> -
> - if (rx_offloads & (DEV_RX_OFFLOAD_UDP_CKSUM |
> - DEV_RX_OFFLOAD_TCP_CKSUM))
> - hw->use_simple_rx = 0;
>
> return 0;
> }
>
next prev parent reply other threads:[~2018-07-02 11:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-02 13:56 [dpdk-dev] [PATCH v5 0/9] support in-order feature Marvin Liu
2018-07-02 8:33 ` Maxime Coquelin
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 1/9] vhost: advertise " Marvin Liu
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 2/9] net/virtio: add in-order feature bit definition Marvin Liu
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 3/9] net/virtio-user: add unsupported features mask Marvin Liu
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 4/9] net/virtio-user: add mrg-rxbuf and in-order vdev parameters Marvin Liu
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 5/9] net/virtio: free in-order descriptors before device start Marvin Liu
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 6/9] net/virtio: extract common part for in-order functions Marvin Liu
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 7/9] net/virtio: support in-order Rx and Tx Marvin Liu
2018-07-02 16:41 ` Ferruh Yigit
2018-07-02 16:52 ` Ferruh Yigit
2018-07-02 16:53 ` Maxime Coquelin
2018-07-02 16:57 ` Ferruh Yigit
2018-07-03 1:36 ` Liu, Yong
2018-07-03 10:36 ` Ferruh Yigit
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 8/9] net/virtio: add in-order Rx/Tx into selection Marvin Liu
2018-07-02 11:24 ` Maxime Coquelin [this message]
2018-07-02 12:41 ` Maxime Coquelin
2018-07-02 15:18 ` Maxime Coquelin
2018-07-03 1:40 ` Liu, Yong
2018-07-02 13:56 ` [dpdk-dev] [PATCH v5 9/9] net/virtio: advertise support in-order feature Marvin Liu
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