net: stmmac: fix jumbo frame sending with non-linear skbs

When sending non-linear skbs with jumbo frames, we set up the non-paged
data and mark that as a last segment, although the paged fragments are
also prepared. This will stall the TX queue and trigger a watchdog warning
(a simple reproducer is to run an iperf client mode TCP test with a large
MTU - networking fails instantly).

Fix by checking if the skb is non-linear.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Acked-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
index bc83ced..f936166 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
@@ -79,7 +79,8 @@ static int jumbo_frm(void *p, struct sk_buff *skb, int csum)
 
                desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);
                stmmac_prepare_tx_desc(priv, desc, 0, len, csum,
-                               STMMAC_RING_MODE, 1, true, skb->len);
+                               STMMAC_RING_MODE, 1, !skb_is_nonlinear(skb),
+                               skb->len);
        } else {
                des2 = dma_map_single(priv->device, skb->data,
                                      nopaged_len, DMA_TO_DEVICE);
@@ -91,7 +92,8 @@ static int jumbo_frm(void *p, struct sk_buff *skb, int csum)
                tx_q->tx_skbuff_dma[entry].is_jumbo = true;
                desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);
                stmmac_prepare_tx_desc(priv, desc, 1, nopaged_len, csum,
-                               STMMAC_RING_MODE, 0, true, skb->len);
+                               STMMAC_RING_MODE, 0, !skb_is_nonlinear(skb),
+                               skb->len);
        }
 
        tx_q->cur_tx = entry;