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 <[email protected]> Signed-off-by: David S. Miller <[email protected]>
EttusResearch · Sep 20, 2023 · 40d8353 · 40d8353
1 parent 4d9d722
commit 40d8353
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/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);
+		}
 	}
 }