net: stmmac: selftests: Always use max DMA size in Jumbo Test

Although some XGMAC setups support frames larger than DMA size, some of
them may not. As we can't know before-hand which ones support let's use
the maximum DMA buffer size in the Jumbo Tests.

User can always reconfigure the MTU to achieve larger frames.

Fixes: 427849e8 ("net: stmmac: selftests: Add Jumbo Frame tests")
Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c

@@ -1564,10 +1564,6 @@ static int __stmmac_test_jumbo(struct stmmac_priv *priv, u16 queue)
 	struct stmmac_packet_attrs attr = { };
 	int size = priv->dma_buf_sz;
 
-	/* Only XGMAC has SW support for multiple RX descs in same packet */
-	if (priv->plat->has_xgmac)
-		size = priv->dev->max_mtu;
-
 	attr.dst = priv->dev->dev_addr;
 	attr.max_size = size - ETH_FCS_LEN;
 	attr.queue_mapping = queue;