Re: [dpdk-dev] [PATCH v2 01/15] ethdev: introduce shared Rx queue
From: Jerin Jacob <hidden>
Date: 2021-08-17 09:33:56
On Wed, Aug 11, 2021 at 7:34 PM Xueming Li [off-list ref] 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 <redacted> Cc: Jerin Jacob <redacted> --- 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
quoted hunk ↗ jump to hunk
#undef RTE_RX_OFFLOAD_BIT2STRdiff --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?
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/** * 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