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Date:   Fri, 17 Jan 2020 18:21:47 +0530
From:   Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, nirranjan@...lsio.com, vishal@...lsio.com,
        dt@...lsio.com
Subject: [PATCH net] cxgb4: reject overlapped queues in TC-MQPRIO offload

A queue can't belong to multiple traffic classes. So, reject
any such configuration that results in overlapped queues for a
traffic class.

Fixes: b1396c2bd675 ("cxgb4: parse and configure TC-MQPRIO offload")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
---
 .../ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c  | 28 ++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
index 8971dddcdb7a..ec3eb45ee3b4 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
@@ -12,8 +12,9 @@ static int cxgb4_mqprio_validate(struct net_device *dev,
 	struct port_info *pi = netdev2pinfo(dev);
 	struct adapter *adap = netdev2adap(dev);
 	u32 speed, qcount = 0, qoffset = 0;
+	u32 start_a, start_b, end_a, end_b;
 	int ret;
-	u8 i;
+	u8 i, j;
 
 	if (!mqprio->qopt.num_tc)
 		return 0;
@@ -47,6 +48,31 @@ static int cxgb4_mqprio_validate(struct net_device *dev,
 		qoffset = max_t(u16, mqprio->qopt.offset[i], qoffset);
 		qcount += mqprio->qopt.count[i];
 
+		start_a = mqprio->qopt.offset[i];
+		end_a = start_a + mqprio->qopt.count[i] - 1;
+		for (j = i + 1; j < mqprio->qopt.num_tc; j++) {
+			start_b = mqprio->qopt.offset[j];
+			end_b = start_b + mqprio->qopt.count[j] - 1;
+
+			/* If queue count is 0, then the traffic
+			 * belonging to this class will not use
+			 * ETHOFLD queues. So, no need to validate
+			 * further.
+			 */
+			if (!mqprio->qopt.count[i])
+				break;
+
+			if (!mqprio->qopt.count[j])
+				continue;
+
+			if (max_t(u32, start_a, start_b) <=
+			    min_t(u32, end_a, end_b)) {
+				netdev_err(dev,
+					   "Queues can't overlap across tc\n");
+				return -EINVAL;
+			}
+		}
+
 		/* Convert byte per second to bits per second */
 		min_rate += (mqprio->min_rate[i] * 8);
 		max_rate += (mqprio->max_rate[i] * 8);
-- 
2.24.0

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