Port configuration fails because offload flags don't match the expected
value when max-pkt-len is set to a value that should enable receive port
offloading but doesn't.
There are two cases to consider:
1. VIRTIO_NET_F_MTU is set. Then we need to check if the requested
max-pkt-len fits into the MTU plus header. If yes we set the
offload flag.
2. VIRTIO_NET_F_MTU is not set. We can set the offload flag.
Fixes: a4996bd89c42 ("ethdev: new Rx/Tx offloads API")
Cc: sta...@dpdk.org
Signed-off-by: Jens Freimann <jfreim...@redhat.com>
---
v3->v4:
* make use of hw-max_mtu which is calculated during device init. This
way we don't have to re-read the mtu from config space again. This
is safe because hw->max_mtu is not changed after init.
v2->v3:
* remove unnecessary brackets (Maxime)
* fix commit message (David)
v1->v2:
* include virtnet hdr, ethernet header, vlan tag when comparing against
max-rx-pkt-len (Maxime)
drivers/net/virtio/virtio_ethdev.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/net/virtio/virtio_ethdev.c
b/drivers/net/virtio/virtio_ethdev.c
index 7c4c1df00..4cf91909d 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -2351,6 +2351,16 @@ virtio_dev_info_get(struct rte_eth_dev *dev, struct
rte_eth_dev_info *dev_info)
if ((host_features & tso_mask) == tso_mask)
dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_TCP_LRO;
+ if (host_features & (1ULL << VIRTIO_NET_F_MTU)) {
+ uint32_t ether_hdr_len = ETHER_HDR_LEN + VLAN_TAG_LEN +
+ hw->vtnet_hdr_size;
+ if (dev->data->dev_conf.rxmode.max_rx_pkt_len <=
+ hw->max_mtu + ether_hdr_len)
+ dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_JUMBO_FRAME;
+ } else {
+ dev_info->rx_offload_capa |= DEV_RX_OFFLOAD_JUMBO_FRAME;
+ }
+
dev_info->tx_offload_capa = DEV_TX_OFFLOAD_MULTI_SEGS |
DEV_TX_OFFLOAD_VLAN_INSERT;
if (host_features & (1ULL << VIRTIO_NET_F_CSUM)) {
--
2.17.2
