On Wed, Aug 11, 2021 at 7:34 PM Xueming Li <xuemi...@nvidia.com> wrote:
>
> In current DPDK framework, each RX queue is pre-loaded with mbufs for
> incoming packets. When number of representors scale out in a switch
> domain, the memory consumption became significant. Most important,
> polling all ports leads to high cache miss, high latency and low
> throughput.
>
> This patch introduces shared RX queue. Ports with same configuration in
> a switch domain could share RX queue set by specifying sharing group.
> Polling any queue using same shared RX queue receives packets from all
> member ports. Source port is identified by mbuf->port.
>
> Port queue number in a shared group should be identical. Queue index is
> 1:1 mapped in shared group.
>
> Share RX queue must be polled on single thread or core.
>
> Multiple groups is supported by group ID.
>
> Signed-off-by: Xueming Li <xuemi...@nvidia.com>
> Cc: Jerin Jacob <jerinjac...@gmail.com>
> ---
> Rx queue object could be used as shared Rx queue object, it's important
> to clear all queue control callback api that using queue object:
> https://mails.dpdk.org/archives/dev/2021-July/215574.html
> #undef RTE_RX_OFFLOAD_BIT2STR
> diff --git a/lib/ethdev/rte_ethdev.h b/lib/ethdev/rte_ethdev.h
> index d2b27c351f..a578c9db9d 100644
> --- a/lib/ethdev/rte_ethdev.h
> +++ b/lib/ethdev/rte_ethdev.h
> @@ -1047,6 +1047,7 @@ struct rte_eth_rxconf {
> uint8_t rx_drop_en; /**< Drop packets if no descriptors are
> available. */
> uint8_t rx_deferred_start; /**< Do not start queue with
> rte_eth_dev_start(). */
> uint16_t rx_nseg; /**< Number of descriptions in rx_seg array. */
> + uint32_t shared_group; /**< Shared port group index in switch domain.
> */
Not to able to see anyone setting/creating this group ID test application.
How this group is created?
> /**
> * Per-queue Rx offloads to be set using DEV_RX_OFFLOAD_* flags.
> * Only offloads set on rx_queue_offload_capa or rx_offload_capa
> @@ -1373,6 +1374,12 @@ struct rte_eth_conf {
> #define DEV_RX_OFFLOAD_OUTER_UDP_CKSUM 0x00040000
> #define DEV_RX_OFFLOAD_RSS_HASH 0x00080000
> #define RTE_ETH_RX_OFFLOAD_BUFFER_SPLIT 0x00100000
> +/**
> + * Rx queue is shared among ports in same switch domain to save memory,
> + * avoid polling each port. Any port in group can be used to receive packets.
> + * Real source port number saved in mbuf->port field.
> + */
> +#define RTE_ETH_RX_OFFLOAD_SHARED_RXQ 0x00200000
>
> #define DEV_RX_OFFLOAD_CHECKSUM (DEV_RX_OFFLOAD_IPV4_CKSUM | \
> DEV_RX_OFFLOAD_UDP_CKSUM | \
> --
> 2.25.1
>
