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| author |   Damjan Marion <damarion@cisco.com> | 2023-12-04 12:15:23 +0000 |
|---|---|---|
| committer | Damjan Marion <damarion@cisco.com> | 2023-12-04 12:27:19 +0000 |
| commit | c6ae4999d2ddd0b700248aa0a3ea8facded1d359 (patch) | |
| tree | 7f35b6ef213440166ee773dcf2f62326ca7fd55b | |
| parent | 39e79fdf30c653ee814b79c914b46ebe9db40a8f (diff) | |
iavf: workaround for case when PF driver sends zero for max_mtu
Type: improvement
Change-Id: Ie4b2b958a24cdde8c183b700d864fc6f5b0df08f
Signed-off-by: Damjan Marion <damarion@cisco.com>
| -rw-r--r-- | src/plugins/dev_iavf/iavf.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/plugins/dev_iavf/iavf.c b/src/plugins/dev_iavf/iavf.c index 3bf11201a3e..5603f61f45f 100644 --- a/src/plugins/dev_iavf/iavf.c +++ b/src/plugins/dev_iavf/iavf.c @@ -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 = { |