21/04/2017 14:22, Jerin Jacob: > if this flag is advertised by a PMD, Multiple threads can > invoke rte_eth_tx_burst() concurrently on the same tx queue > without SW lock. This is an HW feature found in some NICs > and useful in the following use cases if HW supports it.
Which hardware supports it? [...] > --- a/lib/librte_ether/rte_ethdev.h > +++ b/lib/librte_ether/rte_ethdev.h > +#define DEV_TX_OFFLOAD_TXQ_MT_LOCKFREE 0x00004000 > +/**< Multiple threads can invoke rte_eth_tx_burst() concurrently on the > same + * tx queue without SW lock. > + */ Why TXQ in the name? DEV_TX_OFFLOAD_MT_LOCKFREE would be enough. I wonder whether "lock free" wording is confusing because the locks are probably handled in HW. I think the good wording is "offloaded multi-thread capability", maybe with a naming like DEV_TX_OFFLOAD_MT. Anyway we should reference this flag in rte_eth_tx_burst() and give more details in doc/guides/prog_guide/poll_mode_drv.rst. Should we wait a first hardware PoC to add this flag? Candidate for 17.08?
