[PATCH net-next 13/13] net: stmmac: selftests: Add Jumbo Frame tests

[Jose Abreu]

Add a test to validate the Jumbo Frame support in stmmac in single
channel and multichannel mode.

Signed-off-by: Jose Abreu <joabreu@xxxxxxxxxxxx>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@xxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 .../net/ethernet/stmicro/stmmac/stmmac_selftests.c | 65 +++++++++++++++++++++-
 1 file changed, 62 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
index f531dbe038df..ff499b91ea9f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
@@ -43,9 +43,11 @@ struct stmmac_packet_attrs {
 	int dont_wait;
 	int timeout;
 	int size;
+	int max_size;
 	int remove_sa;
 	u8 id;
 	int sarc;
+	u16 queue_mapping;
 };
 
 static u8 stmmac_test_next_id;
@@ -73,12 +75,14 @@ static struct sk_buff *stmmac_test_get_udp_skb(struct stmmac_priv *priv,
 	else
 		size += sizeof(struct udphdr);
 
-	skb = netdev_alloc_skb(priv->dev, size);
+	if (attr->max_size && (attr->max_size > size))
+		size = attr->max_size;
+
+	skb = netdev_alloc_skb_ip_align(priv->dev, size);
 	if (!skb)
 		return NULL;
 
 	prefetchw(skb->data);
-	skb_reserve(skb, NET_IP_ALIGN);
 
 	if (attr->vlan > 1)
 		ehdr = skb_push(skb, ETH_HLEN + 8);
@@ -147,6 +151,9 @@ static struct sk_buff *stmmac_test_get_udp_skb(struct stmmac_priv *priv,
 		uhdr->source = htons(attr->sport);
 		uhdr->dest = htons(attr->dport);
 		uhdr->len = htons(sizeof(*shdr) + sizeof(*uhdr) + attr->size);
+		if (attr->max_size)
+			uhdr->len = htons(attr->max_size -
+					  (sizeof(*ihdr) + sizeof(*ehdr)));
 		uhdr->check = 0;
 	}
 
@@ -162,6 +169,10 @@ static struct sk_buff *stmmac_test_get_udp_skb(struct stmmac_priv *priv,
 		iplen += sizeof(*thdr);
 	else
 		iplen += sizeof(*uhdr);
+
+	if (attr->max_size)
+		iplen = attr->max_size - sizeof(*ehdr);
+
 	ihdr->tot_len = htons(iplen);
 	ihdr->frag_off = 0;
 	ihdr->saddr = htonl(attr->ip_src);
@@ -178,6 +189,8 @@ static struct sk_buff *stmmac_test_get_udp_skb(struct stmmac_priv *priv,
 
 	if (attr->size)
 		skb_put(skb, attr->size);
+	if (attr->max_size && (attr->max_size > skb->len))
+		skb_put(skb, attr->max_size - skb->len);
 
 	skb->csum = 0;
 	skb->ip_summed = CHECKSUM_PARTIAL;
@@ -324,7 +337,7 @@ static int __stmmac_test_loopback(struct stmmac_priv *priv,
 		goto cleanup;
 	}
 
-	skb_set_queue_mapping(skb, 0);
+	skb_set_queue_mapping(skb, attr->queue_mapping);
 	ret = dev_queue_xmit(skb);
 	if (ret)
 		goto cleanup;
@@ -1502,6 +1515,44 @@ static int stmmac_test_arpoffload(struct stmmac_priv *priv)
 	return ret;
 }
 
+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;
+
+	return __stmmac_test_loopback(priv, &attr);
+}
+
+static int stmmac_test_jumbo(struct stmmac_priv *priv)
+{
+	return __stmmac_test_jumbo(priv, 0);
+}
+
+static int stmmac_test_mjumbo(struct stmmac_priv *priv)
+{
+	u32 chan, tx_cnt = priv->plat->tx_queues_to_use;
+	int ret;
+
+	if (tx_cnt <= 1)
+		return -EOPNOTSUPP;
+
+	for (chan = 0; chan < tx_cnt; chan++) {
+		ret = __stmmac_test_jumbo(priv, chan);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 #define STMMAC_LOOPBACK_NONE	0
 #define STMMAC_LOOPBACK_MAC	1
 #define STMMAC_LOOPBACK_PHY	2
@@ -1615,6 +1666,14 @@ static const struct stmmac_test {
 		.name = "ARP Offload         ",
 		.lb = STMMAC_LOOPBACK_PHY,
 		.fn = stmmac_test_arpoffload,
+	}, {
+		.name = "Jumbo Frame         ",
+		.lb = STMMAC_LOOPBACK_PHY,
+		.fn = stmmac_test_jumbo,
+	}, {
+		.name = "Multichannel Jumbo  ",
+		.lb = STMMAC_LOOPBACK_PHY,
+		.fn = stmmac_test_mjumbo,
 	},
 };
 
-- 
2.7.4