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Subject[PATCH net-next v2 8/8] net: stmmac: selftests: Add a test for TBS feature
Date
Add a new test for TBS feature which is used in ETF scheduler. In this
test, we send a packet with a launch time specified as now + 500ms and
check if the packet was transmitted on that time frame.

Signed-off-by: Jose Abreu <Jose.Abreu@synopsys.com>

---
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Jose Abreu <joabreu@synopsys.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: netdev@vger.kernel.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
.../net/ethernet/stmicro/stmmac/stmmac_selftests.c | 73 ++++++++++++++++++++++
1 file changed, 73 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
index d50ae59fe3d8..7cc59e66e42a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
@@ -14,6 +14,7 @@
#include <linux/phy.h>
#include <linux/udp.h>
#include <net/pkt_cls.h>
+#include <net/pkt_sched.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <net/tc_act/tc_gact.h>
@@ -50,6 +51,7 @@ struct stmmac_packet_attrs {
u8 id;
int sarc;
u16 queue_mapping;
+ u64 timestamp;
};

static u8 stmmac_test_next_id;
@@ -208,6 +210,9 @@ static struct sk_buff *stmmac_test_get_udp_skb(struct stmmac_priv *priv,
skb->pkt_type = PACKET_HOST;
skb->dev = priv->dev;

+ if (attr->timestamp)
+ skb->tstamp = ns_to_ktime(attr->timestamp);
+
return skb;
}

@@ -1723,6 +1728,70 @@ static int stmmac_test_sph(struct stmmac_priv *priv)
return 0;
}

+static int stmmac_test_tbs(struct stmmac_priv *priv)
+{
+#define STMMAC_TBS_LT_OFFSET (500 * 1000 * 1000) /* 500 ms*/
+ struct stmmac_packet_attrs attr = { };
+ struct tc_etf_qopt_offload qopt;
+ u64 start_time, curr_time = 0;
+ unsigned long flags;
+ int ret, i;
+
+ if (!priv->hwts_tx_en)
+ return -EOPNOTSUPP;
+
+ /* Find first TBS enabled Queue, if any */
+ for (i = 0; i < priv->plat->tx_queues_to_use; i++)
+ if (priv->tx_queue[i].tbs_avail)
+ break;
+
+ if (i >= priv->plat->tx_queues_to_use || !priv->tx_queue[i].tbs_avail)
+ return -EOPNOTSUPP;
+
+ qopt.enable = true;
+ qopt.queue = i;
+
+ ret = stmmac_tc_setup_etf(priv, priv, &qopt);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&priv->ptp_lock, flags);
+ stmmac_get_systime(priv, priv->ptpaddr, &curr_time);
+ spin_unlock_irqrestore(&priv->ptp_lock, flags);
+
+ if (!curr_time) {
+ ret = -EOPNOTSUPP;
+ goto fail_disable;
+ }
+
+ start_time = curr_time;
+ curr_time += STMMAC_TBS_LT_OFFSET;
+
+ attr.dst = priv->dev->dev_addr;
+ attr.timestamp = curr_time;
+ attr.timeout = nsecs_to_jiffies(2 * STMMAC_TBS_LT_OFFSET);
+ attr.queue_mapping = i;
+
+ pr_info("%s: start_time=0x%lld\n", __func__, start_time);
+ ret = __stmmac_test_loopback(priv, &attr);
+ if (ret)
+ goto fail_disable;
+
+ /* Check if expected time has elapsed */
+ spin_lock_irqsave(&priv->ptp_lock, flags);
+ stmmac_get_systime(priv, priv->ptpaddr, &curr_time);
+ spin_unlock_irqrestore(&priv->ptp_lock, flags);
+
+ pr_info("%s: curr_time=0x%lld\n", __func__, curr_time);
+ if ((curr_time - start_time) < STMMAC_TBS_LT_OFFSET)
+ ret = -EINVAL;
+
+fail_disable:
+ qopt.enable = false;
+ stmmac_tc_setup_etf(priv, priv, &qopt);
+ return ret;
+}
+
#define STMMAC_LOOPBACK_NONE 0
#define STMMAC_LOOPBACK_MAC 1
#define STMMAC_LOOPBACK_PHY 2
@@ -1856,6 +1925,10 @@ static const struct stmmac_test {
.name = "Split Header ",
.lb = STMMAC_LOOPBACK_PHY,
.fn = stmmac_test_sph,
+ }, {
+ .name = "TBS (ETF Scheduler) ",
+ .lb = STMMAC_LOOPBACK_PHY,
+ .fn = stmmac_test_tbs,
},
};

--
2.7.4
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