From: Michal Jaron <michalx.jaron@xxxxxxxxx>
[ Upstream commit 372539def2824c43b6afe2403045b140f65c5acc ]
Max MTU sent to VF is set to 0 during memory allocation. It cause
that max MTU on VF is changed to IAVF_MAX_RXBUFFER and does not
depend on data from HW.
Set max_mtu field in virtchnl_vf_resource struct to inform
VF in GET_VF_RESOURCES msg what size should be max frame.
Fixes: dab86afdbbd1 ("i40e/i40evf: Change the way we limit the maximum frame size for Rx")
Signed-off-by: Michal Jaron <michalx.jaron@xxxxxxxxx>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@xxxxxxxxx>
Tested-by: Konrad Jankowski <konrad0.jankowski@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../ethernet/intel/i40e/i40e_virtchnl_pf.c | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 86b0f21287dc..67fbaaad3985 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -2038,6 +2038,25 @@ static void i40e_del_qch(struct i40e_vf *vf)
}
}
+/**
+ * i40e_vc_get_max_frame_size
+ * @vf: pointer to the VF
+ *
+ * Max frame size is determined based on the current port's max frame size and
+ * whether a port VLAN is configured on this VF. The VF is not aware whether
+ * it's in a port VLAN so the PF needs to account for this in max frame size
+ * checks and sending the max frame size to the VF.
+ **/
+static u16 i40e_vc_get_max_frame_size(struct i40e_vf *vf)
+{
+ u16 max_frame_size = vf->pf->hw.phy.link_info.max_frame_size;
+
+ if (vf->port_vlan_id)
+ max_frame_size -= VLAN_HLEN;
+
+ return max_frame_size;
+}
+
/**
* i40e_vc_get_vf_resources_msg
* @vf: pointer to the VF info
@@ -2139,6 +2158,7 @@ static int i40e_vc_get_vf_resources_msg(struct i40e_vf *vf, u8 *msg)
vfres->max_vectors = pf->hw.func_caps.num_msix_vectors_vf;
vfres->rss_key_size = I40E_HKEY_ARRAY_SIZE;
vfres->rss_lut_size = I40E_VF_HLUT_ARRAY_SIZE;
+ vfres->max_mtu = i40e_vc_get_max_frame_size(vf);
if (vf->lan_vsi_idx) {
vfres->vsi_res[0].vsi_id = vf->lan_vsi_id;
--
2.35.1
