[dpdk-dev] [PATCH 1/3] ethdev: add max burst size to device info

Nikhil Agarwal nikhil.agarwal at linaro.org
Tue Dec 12 11:05:18 CET 2017

Currently, if the  rte_eth_rx_burst() function returns a value less than
*nb_pkts*, the application will assume that no more packets are present.

Some of the hw queue based hardware can only support smaller burst for RX
and TX and thus break the expectation of the rx_burst API.

This patch adds support to provide the maximum burst size that can be
supported by a given PMD. The dev_info is being memset to '0' in
rte_ethdev library. The value of '0' indicates that any value for burst
size can be supported i.e. no change for existing PMDs.

The application can now use the lowest available max_burst_size value
for rte_eth_rx_burst.

Signed-off-by: Nikhil Agarwal <nikhil.agarwal at linaro.org>
 lib/librte_ether/rte_ethdev.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 341c2d6..3ab6f02 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1047,6 +1047,7 @@ struct rte_eth_dev_info {
 	/** Configured number of rx/tx queues */
 	uint16_t nb_rx_queues; /**< Number of RX queues. */
 	uint16_t nb_tx_queues; /**< Number of TX queues. */
+	uint16_t max_burst_size; /**< MAX burst size, 0 for no limit. */

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