diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 841e49e1e09170ce969b3d221776200864a2fe7d..12d7191c936af682abf457552c1814db2f25679a 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -15290,6 +15290,14 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			i40e_stat_str(&pf->hw, err),
 			i40e_aq_str(&pf->hw, pf->hw.aq.asq_last_status));
 
+	/* make sure the MFS hasn't been set lower than the default */
+#define MAX_FRAME_SIZE_DEFAULT 0x2600
+	val = (rd32(&pf->hw, I40E_PRTGL_SAH) &
+	       I40E_PRTGL_SAH_MFS_MASK) >> I40E_PRTGL_SAH_MFS_SHIFT;
+	if (val < MAX_FRAME_SIZE_DEFAULT)
+		dev_warn(&pdev->dev, "MFS for port %x has been set below the default: %x\n",
+			 i, val);
+
 	/* Add a filter to drop all Flow control frames from any VSI from being
 	 * transmitted. By doing so we stop a malicious VF from sending out
 	 * PAUSE or PFC frames and potentially controlling traffic for other