[dpdk-dev] [PATCH v2 0/3] new API to free consumed buffers in Tx ring
bmcfall at redhat.com
Wed Jan 11 21:03:20 CET 2017
Based on a request from Damjan Marion and seconded by Keith Wiles, see
dpdk-dev mailing list from 11/21/2016, add a new API to free consumed
buffers on TX ring. This addresses two scenarios:
1) Flooding a packet and want to reuse existing mbuf to avoid a packet
copy. Increment the reference count of the packet and poll new API until
reference count is decremented.
2) Application runs out of mbufs, or resets and is preparing for
additional run, call API to free consumed packets so processing can
API will return the number of packets freed (0-n) or error code if
feature not supported (-ENOTSUP) or input invalid (-ENODEV).
API for e1000 igb driver and vHost driver have been implemented. Other
drivers can be implemented over time. Some drivers implement a Tx done
flush routine that should be reused where possible. e1000 igb driver
and vHost driver do not have such functions.
* Removed rte_eth_tx_buffer_flush() call and associated parameters
from new rte_eth_tx_done_cleanup() API.
* Remaining open issue is whether this should be a new API or overload
existing rte_eth_tx_buffer() API with input parameter nb_pkts set to
0. My concern is that overloading existing API will not provided
enough feedback to application. Application needs to know if feature
is supported and driver is attempting to free mbufs or not.
* If new API is supported, second open issue is if parameter free_cnt
should be included. It was in the original feature request.
Billy McFall (3):
ethdev: new API to free consumed buffers in Tx ring
net/e1000: e1000 igb support to free consumed buffers
net/vhost: vHost support to free consumed buffers
drivers/net/e1000/e1000_ethdev.h | 2 +
drivers/net/e1000/igb_ethdev.c | 1 +
drivers/net/e1000/igb_rxtx.c | 126 ++++++++++++++++++++++++++++++++++++++
drivers/net/vhost/rte_eth_vhost.c | 11 ++++
lib/librte_ether/rte_ethdev.h | 43 +++++++++++++
5 files changed, 183 insertions(+)
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