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iavf: workaround for case when PF driver sends zero for max_mtu

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Type: improvement
Change-Id: Ie4b2b958a24cdde8c183b700d864fc6f5b0df08f
Signed-off-by: Damjan Marion <damarion@cisco.com>
This commit is contained in:
Damjan Marion
2023-12-04 12:15:23 +00:00
parent 39e79fdf30
commit c6ae4999d2
1 changed files with 13 additions and 1 deletions
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14
src/plugins/dev_iavf/iavf.c
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@@ -121,6 +121,7 @@ iavf_init (vlib_main_t *vm, vnet_dev_t *dev)
virtchnl_version_info_t ver;
virtchnl_vf_resource_t res;
u32 n_threads = vlib_get_n_threads ();
u16 max_frame_sz;
vnet_dev_rv_t rv;
log_debug (dev, "init");
@@ -147,6 +148,17 @@ iavf_init (vlib_main_t *vm, vnet_dev_t *dev)
if (res.num_vsis != 1 || res.vsi_res[0].vsi_type != VIRTCHNL_VSI_SRIOV)
return VNET_DEV_ERR_UNSUPPORTED_DEVICE;
if (res.max_mtu == 0)
{
log_warn (dev, "PF driver is reporting invalid value of 0 for max_mtu, "
"consider upgrade");
max_frame_sz = ETHERNET_MAX_PACKET_BYTES;
}
else
/* reverse of PF driver MTU calculation */
max_frame_sz = res.max_mtu + 14 /* ethernet header */ + 4 /* FCS */ +
2 * 4 /* two VLAN tags */;
iavf_port_t iavf_port = {
.vf_cap_flags = res.vf_cap_flags,
.rss_key_size = res.rss_key_size,
@@ -162,7 +174,7 @@ iavf_init (vlib_main_t *vm, vnet_dev_t *dev)
.type = VNET_DEV_PORT_TYPE_ETHERNET,
.max_rx_queues = clib_min (IAVF_MAX_QPAIRS, res.num_queue_pairs),
.max_tx_queues = clib_min (IAVF_MAX_QPAIRS, res.num_queue_pairs),
.max_supported_rx_frame_size = res.max_mtu,
.max_supported_rx_frame_size = max_frame_sz,
.caps.change_max_rx_frame_size = 1,
},
.ops = {