On 7/16/23 13:57, Ivan Malov wrote:
> This may be required by some PMDs in offload scenarios.
Seems reasonable. I don't have HW with a driver that implements this
API, but the change doesn't seem too risky. So, applied and backported
down to 3.1. Thanks!
>
> Fixes: e8a2b5bf92bb ("netdev-dpdk: implement flow offload with rte flow")
This is not the right tag, because the metadata negotiation API
didn't exist back then. It should've been a patch that added
support for DPDK 22.11 instead. But I realized that after I pushed
the change. So it will stay this way in the repo... Sorry.
Best regards, Ilya Maximets.
> Signed-off-by: Ivan Malov <[email protected]>
> ---
> v2: add missing experimental api ifdef
>
> lib/netdev-dpdk.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 56 insertions(+)
>
> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
> index aa87ee546..ea4cc6977 100644
> --- a/lib/netdev-dpdk.c
> +++ b/lib/netdev-dpdk.c
> @@ -512,6 +512,9 @@ struct netdev_dpdk {
>
> /* Array of vhost rxq states, see vring_state_changed. */
> bool *vhost_rxq_enabled;
> +
> + /* Ensures that Rx metadata delivery is configured only once. */
> + bool rx_metadata_delivery_configured;
> );
>
> PADDED_MEMBERS(CACHE_LINE_SIZE,
> @@ -1220,6 +1223,45 @@ dpdk_eth_flow_ctrl_setup(struct netdev_dpdk *dev)
> OVS_REQUIRES(dev->mutex)
> }
> }
>
> +static void
> +dpdk_eth_dev_init_rx_metadata(struct netdev_dpdk *dev)
> +{
> + uint64_t rx_metadata = 0;
> + int ret;
> +
> + if (dev->rx_metadata_delivery_configured) {
> + return;
> + }
> +
> + /* For the fallback offload (non-"transfer" rules) */
> + rx_metadata |= RTE_ETH_RX_METADATA_USER_MARK;
> +
> +#ifdef ALLOW_EXPERIMENTAL_API
> + /* For the tunnel offload */
> + rx_metadata |= RTE_ETH_RX_METADATA_TUNNEL_ID;
> +#endif /* ALLOW_EXPERIMENTAL_API */
> +
> + ret = rte_eth_rx_metadata_negotiate(dev->port_id, &rx_metadata);
> + if (ret == 0) {
> + if (!(rx_metadata & RTE_ETH_RX_METADATA_USER_MARK)) {
> + VLOG_DBG("%s: The NIC will not provide per-packet USER_MARK",
> + netdev_get_name(&dev->up));
> + }
> +#ifdef ALLOW_EXPERIMENTAL_API
> + if (!(rx_metadata & RTE_ETH_RX_METADATA_TUNNEL_ID)) {
> + VLOG_DBG("%s: The NIC will not provide per-packet TUNNEL_ID",
> + netdev_get_name(&dev->up));
> + }
> +#endif /* ALLOW_EXPERIMENTAL_API */
> + } else {
> + VLOG(ret == -ENOTSUP ? VLL_DBG : VLL_WARN,
> + "%s: Cannot negotiate Rx metadata: %s",
> + netdev_get_name(&dev->up), rte_strerror(-ret));
> + }
> +
> + dev->rx_metadata_delivery_configured = true;
> +}
> +
> static int
> dpdk_eth_dev_init(struct netdev_dpdk *dev)
> OVS_REQUIRES(dev->mutex)
> @@ -1233,6 +1275,18 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev)
> RTE_ETH_RX_OFFLOAD_TCP_CKSUM |
> RTE_ETH_RX_OFFLOAD_IPV4_CKSUM;
>
> + if (netdev_is_flow_api_enabled()) {
> + /*
> + * Full tunnel offload requires that tunnel ID metadata be
> + * delivered with "miss" packets from the hardware to the
> + * PMD. The same goes for megaflow mark metadata which is
> + * used in MARK + RSS offload scenario.
> + *
> + * Request delivery of such metadata.
> + */
> + dpdk_eth_dev_init_rx_metadata(dev);
> + }
> +
> rte_eth_dev_info_get(dev->port_id, &info);
>
> if (strstr(info.driver_name, "vf") != NULL) {
> @@ -1421,6 +1475,8 @@ common_construct(struct netdev *netdev, dpdk_port_t
> port_no,
> /* Initilize the hardware offload flags to 0 */
> dev->hw_ol_features = 0;
>
> + dev->rx_metadata_delivery_configured = false;
> +
> dev->flags = NETDEV_UP | NETDEV_PROMISC;
>
> ovs_list_push_back(&dpdk_list, &dev->list_node);
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