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Introducing the DEV_TX_OFFLOAD_MT_LOCKFREE TX capability flag. if a PMD advertises DEV_TX_OFFLOAD_MT_LOCKFREE capable, multiple threads can invoke rte_eth_tx_burst() concurrently on the same tx queue without SW lock. This PMD feature will be useful in the following use cases and found in the OCTEON family of NPUs. 1) Remove explicit spinlock in some applications where lcores to TX queues are not mapped 1:1. example: OVS has such instance https://github.com/openvswitch/ovs/blob/master/lib/netdev-dpdk.c#L299 https://github.com/openvswitch/ovs/blob/master/lib/netdev-dpdk.c#L1859 See the the usage of tx_lock spinlock. 2) In the eventdev use case, avoid dedicating a separate TX core for transmitting and thus enables more scaling as all workers can send the packets. Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com> Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com> Acked-by: Santosh Shukla <santosh.shukla@caviumnetworks.com> |
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