qlcnic: add loopback diagnostic test

Loopback test (offline) added in ethtool self test.
o Set device in loopback mode
o Send packets
o Process receive packets in qlcnic_process_rcv_ring_diag()
o Compare packets
o Reset device in normal mode.

Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 81 insertions, 1 deletions

diff --git a/drivers/net/qlcnic/qlcnic_ethtool.c b/drivers/net/qlcnic/qlcnic_ethtool.c
index 58c50ed791d..8da6ec8c13b 100644
--- a/drivers/net/qlcnic/qlcnic_ethtool.c
+++ b/drivers/net/qlcnic/qlcnic_ethtool.c
@@ -66,7 +66,8 @@ static const struct qlcnic_stats qlcnic_gstrings_stats[] = {
 static const char qlcnic_gstrings_test[][ETH_GSTRING_LEN] = {
 	"Register_Test_on_offline",
 	"Link_Test_on_offline",
-	"Interrupt_Test_offline"
+	"Interrupt_Test_offline",
+	"Loopback_Test_offline"
 };
 
 #define QLCNIC_TEST_LEN	ARRAY_SIZE(qlcnic_gstrings_test)
@@ -614,6 +615,80 @@ static int qlcnic_get_sset_count(struct net_device *dev, int sset)
 	}
 }
 
+#define QLC_ILB_PKT_SIZE 64
+
+static void qlcnic_create_loopback_buff(unsigned char *data)
+{
+	unsigned char random_data[] = {0xa8, 0x06, 0x45, 0x00};
+	memset(data, 0x4e, QLC_ILB_PKT_SIZE);
+	memset(data, 0xff, 12);
+	memcpy(data + 12, random_data, sizeof(random_data));
+}
+
+int qlcnic_check_loopback_buff(unsigned char *data)
+{
+	unsigned char buff[QLC_ILB_PKT_SIZE];
+	qlcnic_create_loopback_buff(buff);
+	return memcmp(data, buff, QLC_ILB_PKT_SIZE);
+}
+
+static int qlcnic_do_ilb_test(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_recv_context *recv_ctx = &adapter->recv_ctx;
+	struct qlcnic_host_sds_ring *sds_ring = &recv_ctx->sds_rings[0];
+	struct sk_buff *skb;
+	int i;
+
+	for (i = 0; i < 16; i++) {
+		skb = dev_alloc_skb(QLC_ILB_PKT_SIZE);
+		qlcnic_create_loopback_buff(skb->data);
+		skb_put(skb, QLC_ILB_PKT_SIZE);
+
+		adapter->diag_cnt = 0;
+
+		qlcnic_xmit_frame(skb, adapter->netdev);
+
+		msleep(5);
+
+		qlcnic_process_rcv_ring_diag(sds_ring);
+
+		dev_kfree_skb_any(skb);
+		if (!adapter->diag_cnt)
+			return -1;
+	}
+	return 0;
+}
+
+static int qlcnic_loopback_test(struct net_device *netdev)
+{
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	int max_sds_rings = adapter->max_sds_rings;
+	int ret;
+
+	if (test_and_set_bit(__QLCNIC_RESETTING, &adapter->state))
+		return -EIO;
+
+	ret = qlcnic_diag_alloc_res(netdev, QLCNIC_LOOPBACK_TEST);
+	if (ret)
+		goto clear_it;
+
+	ret = qlcnic_set_ilb_mode(adapter);
+	if (ret)
+		goto done;
+
+	ret = qlcnic_do_ilb_test(adapter);
+
+	qlcnic_clear_ilb_mode(adapter);
+
+done:
+	qlcnic_diag_free_res(netdev, max_sds_rings);
+
+clear_it:
+	adapter->max_sds_rings = max_sds_rings;
+	clear_bit(__QLCNIC_RESETTING, &adapter->state);
+	return ret;
+}
+
 static int qlcnic_irq_test(struct net_device *netdev)
 {
 	struct qlcnic_adapter *adapter = netdev_priv(netdev);
@@ -656,6 +731,11 @@ qlcnic_diag_test(struct net_device *dev, struct ethtool_test *eth_test,
 		data[2] = qlcnic_irq_test(dev);
 		if (data[2])
 			eth_test->flags |= ETH_TEST_FL_FAILED;
+
+		data[3] = qlcnic_loopback_test(dev);
+		if (data[3])
+			eth_test->flags |= ETH_TEST_FL_FAILED;
+
 	}
 
 	data[0] = qlcnic_reg_test(dev);