[dpdk-dev] [PATCH v2 0/5] consistent PMD batching behaviour

[Zhiyong Yang]

The rte_eth_tx_burst() function in the file Rte_ethdev.h is invoked to
transmit output packets on the output queue for DPDK applications as
follows.

static inline uint16_t
rte_eth_tx_burst(uint8_t port_id, uint16_t queue_id,
                 struct rte_mbuf **tx_pkts, uint16_t nb_pkts);

Note: The fourth parameter nb_pkts: The number of packets to transmit.

The rte_eth_tx_burst() function returns the number of packets it actually
sent. Most of PMD drivers can support the policy "send as many packets to
transmit as possible" at the PMD level. but the few of PMDs have some sort
of artificial limits for the pkts sent successfully. For example, VHOST tx
burst size is limited to 32 packets. Some rx_burst functions have the
similar problem. The main benefit is consistent batching behavior for user
to simplify their logic and avoid misusage at the application level, there
is unified rte_eth_tx/rx_burst interface already, there is no reason for
inconsistent behaviors. 
This patchset fixes it via adding wrapper function at the PMD level.

Changes in V2:
1. rename ixgbe, i40e and fm10k vec function XXX_xmit_pkts_vec to new name
XXX_xmit_fixed_burst_vec, new wrapper functions use original name
XXX_xmit_pkts_vec according to Bruce's suggestion.

2. simplify the code to avoid the if or if/else.

Zhiyong Yang (5):
  net/fm10k: remove limit of fm10k_xmit_pkts_vec burst size
  net/i40e: remove limit of i40e_xmit_pkts_vec burst size
  net/ixgbe: remove limit of ixgbe_xmit_pkts_vec burst size
  net/vhost: remove limit of vhost TX burst size
  net/vhost: remove limit of vhost RX burst size

 drivers/net/fm10k/fm10k.h               |  4 ++--
 drivers/net/fm10k/fm10k_ethdev.c        | 28 ++++++++++++++++++++++++---
 drivers/net/fm10k/fm10k_rxtx_vec.c      |  4 ++--
 drivers/net/i40e/i40e_rxtx.c            | 28 ++++++++++++++++++++++++---
 drivers/net/i40e/i40e_rxtx.h            |  4 ++--
 drivers/net/i40e/i40e_rxtx_vec_neon.c   |  4 ++--
 drivers/net/i40e/i40e_rxtx_vec_sse.c    |  4 ++--
 drivers/net/ixgbe/ixgbe_rxtx.c          | 29 ++++++++++++++++++++++++++++
 drivers/net/ixgbe/ixgbe_rxtx.h          |  4 ++--
 drivers/net/ixgbe/ixgbe_rxtx_vec_neon.c |  4 ++--
 drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c  |  4 ++--
 drivers/net/vhost/rte_eth_vhost.c       | 34 +++++++++++++++++++++++++++++----
 12 files changed, 125 insertions(+), 26 deletions(-)

-- 
2.7.4