On 1/30/19 4:26 PM, Jens Freimann wrote:
Port configuration fails when offload flags don't match the expected
value, e.g. when max-pkt-len is set to a value that should enable
receive port offloading but doesn't.
This can be triggered by running testpmd e.g. with --max-pkt-len=2000.
It will fail with "Ethdev port_id=0 requested Rx offloads 0x800 doesn't
match Rx offloads capabilities 0x20d in rte_eth_dev_configure()"
To fix this there are two cases to consider:
1. VIRTIO_NET_F_MTU is negotiated. Then we need to check if the
requested max. packet length fits into the MTU. If yes we set the
offload flag.
2. VIRTIO_NET_F_MTU is not negotiated. We can set the offload flag.
I think we need to Cc: stable and point to the commit introducing the
regression. I think it is the one introducing the use of
DEV_RX_OFFLOAD_JUMBO_FRAME in Virtio PMD.
Signed-off-by: Jens Freimann <jfreim...@redhat.com>
---
drivers/net/virtio/virtio_ethdev.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/net/virtio/virtio_ethdev.c
b/drivers/net/virtio/virtio_ethdev.c
index 7c4c1df00..e0d6542d4 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -2351,6 +2351,17 @@ 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)) {
+ struct virtio_net_config config;
+ vtpci_read_dev_config(hw,
+ offsetof(struct virtio_net_config, mtu),
+ &config.mtu, sizeof(config.mtu));
+ if (dev->data->dev_conf.rxmode.max_rx_pkt_len <= config.mtu)
That is not exactly right, MTU does not take into account the Ethernet
header, the VLAN tag and the virtio-net header.
See virtio_mtu_set() for example.
+ 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)) {
