[dpdk-dev] [PATCH v3 1/4] net/netvsc: propagate descriptor limits from VF to netvsc

[Stephen Hemminger <stephen@networkplumber.org>]

If application cares about descriptor limits, the netvsc device
values should reflect those of the VF as well.

Fixes: dc7680e8597c ("net/netvsc: support integrated VF")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/netvsc/hn_vf.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/netvsc/hn_vf.c b/drivers/net/netvsc/hn_vf.c
index 7a3734cadfa4..1261b2e2ef85 100644
--- a/drivers/net/netvsc/hn_vf.c
+++ b/drivers/net/netvsc/hn_vf.c
@@ -167,6 +167,17 @@ hn_nvs_handle_vfassoc(struct rte_eth_dev *dev,
 		hn_vf_remove(hv);
 }
 
+static void
+hn_vf_merge_desc_lim(struct rte_eth_desc_lim *lim,
+		     const struct rte_eth_desc_lim *vf_lim)
+{
+	lim->nb_max = RTE_MIN(vf_lim->nb_max, lim->nb_max);
+	lim->nb_min = RTE_MAX(vf_lim->nb_min, lim->nb_min);
+	lim->nb_align = RTE_MAX(vf_lim->nb_align, lim->nb_align);
+	lim->nb_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+	lim->nb_mtu_seg_max = RTE_MIN(vf_lim->nb_seg_max, lim->nb_seg_max);
+}
+
 /*
  * Merge the info from the VF and synthetic path.
  * use the default config of the VF
@@ -196,11 +207,13 @@ static int hn_vf_info_merge(struct rte_eth_dev *vf_dev,
 				      info->max_tx_queues);
 	info->tx_offload_capa &= vf_info.tx_offload_capa;
 	info->tx_queue_offload_capa &= vf_info.tx_queue_offload_capa;
+	hn_vf_merge_desc_lim(&info->tx_desc_lim, &vf_info.tx_desc_lim);
 
 	info->min_rx_bufsize = RTE_MAX(vf_info.min_rx_bufsize,
 				       info->min_rx_bufsize);
 	info->max_rx_pktlen  = RTE_MAX(vf_info.max_rx_pktlen,
 				       info->max_rx_pktlen);
+	hn_vf_merge_desc_lim(&info->rx_desc_lim, &vf_info.rx_desc_lim);
 
 	return 0;
 }
-- 
2.20.1