ionic: add a check for max SGs and SKB frags

Add a check of the queue's max_sg_elems against the maximum frags we
expect to see per SKB and take the smaller of the two as our max for
the queues' descriptor buffer allocations.
Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic_lif.c

@@ -3831,6 +3831,18 @@ static void ionic_lif_queue_identify(struct ionic_lif *lif)
 			qtype, qti->max_sg_elems);
 		dev_dbg(ionic->dev, " qtype[%d].sg_desc_stride = %d\n",
 			qtype, qti->sg_desc_stride);
+
+		if (qti->max_sg_elems >= IONIC_MAX_FRAGS) {
+			qti->max_sg_elems = IONIC_MAX_FRAGS - 1;
+			dev_dbg(ionic->dev, "limiting qtype %d max_sg_elems to IONIC_MAX_FRAGS-1 %d\n",
+				qtype, qti->max_sg_elems);
+		}
+
+		if (qti->max_sg_elems > MAX_SKB_FRAGS) {
+			qti->max_sg_elems = MAX_SKB_FRAGS;
+			dev_dbg(ionic->dev, "limiting qtype %d max_sg_elems to MAX_SKB_FRAGS %d\n",
+				qtype, qti->max_sg_elems);
+		}
 	}
 }