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net/virtio: report Tx descriptor limits in dev info

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Report max/min/align Tx descriptors limits in device info get callback.
Before calling the callback, rte_eth_dev_info_get() provides
default values of nb_min as zero and nb_max as UINT16_MAX that are
not correct for the driver, so one can't rely on them.

Signed-off-by: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
This commit is contained in:
Ivan Ilchenko 2021-09-15 15:23:27 +03:00 committed by Maxime Coquelin
parent 5ac9d766b5
commit 492a239cbf
1 changed files with 4 additions and 0 deletions
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4
drivers/net/virtio/virtio_ethdev.c
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@ -2582,6 +2582,7 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
* The Queue Size value does not have to be a power of 2.
*/
dev_info->rx_desc_lim.nb_max = UINT16_MAX;
dev_info->tx_desc_lim.nb_max = UINT16_MAX;
} else {
/*
* According to 2.6 Split Virtqueues:
@ -2589,6 +2590,7 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
* Size value is 32768.
*/
dev_info->rx_desc_lim.nb_max = 32768;
dev_info->tx_desc_lim.nb_max = 32768;
}
/*
* Actual minimum is not the same for virtqueues of different kinds,
@ -2597,7 +2599,9 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
*/
dev_info->rx_desc_lim.nb_min = RTE_MAX(DEFAULT_RX_FREE_THRESH,
RTE_VIRTIO_VPMD_RX_REARM_THRESH);
dev_info->tx_desc_lim.nb_min = DEFAULT_TX_FREE_THRESH;
dev_info->rx_desc_lim.nb_align = 1;
dev_info->tx_desc_lim.nb_align = 1;
return 0;
}