netdev - [PATCH net-next v4] igc: offload queue max SDU from tc-taprio

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Message-Id: <20230209022924.24154-1-muhammad.husaini.zulkifli@intel.com>
Date:   Thu,  9 Feb 2023 10:29:24 +0800
From:   Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
To:     intel-wired-lan@...osl.org
Cc:     vinicius.gomes@...el.com, muhammad.husaini.zulkifli@...el.com,
        naamax.meir@...ux.intel.com, anthony.l.nguyen@...el.com,
        leon@...nel.org, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, edumazet@...gle.com,
        tee.min.tan@...ux.intel.com, netdev@...r.kernel.org,
        sasha.neftin@...el.com
Subject: [PATCH net-next v4] igc: offload queue max SDU from tc-taprio

From: Tan Tee Min <tee.min.tan@...ux.intel.com>

Add support for configuring the max SDU for each Tx queue.
If not specified, keep the default.

Signed-off-by: Tan Tee Min <tee.min.tan@...ux.intel.com>
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>

---
V3 -> V4: Rebase to the latest tree as per requested by Anthony.
V2 -> V3: Rework based on Leon Romanovsky's comment.
V1 -> V2: Rework based on Vinicius's comment.
---
---
 drivers/net/ethernet/intel/igc/igc.h      |  1 +
 drivers/net/ethernet/intel/igc/igc_main.c | 29 ++++++++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index 9db93c1f97679..34aebf00a5123 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -99,6 +99,7 @@ struct igc_ring {
 
 	u32 start_time;
 	u32 end_time;
+	u32 max_sdu;
 
 	/* CBS parameters */
 	bool cbs_enable;                /* indicates if CBS is enabled */
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index ddbabf4213499..bba3fe31157fb 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -1508,6 +1508,7 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
 	__le32 launch_time = 0;
 	u32 tx_flags = 0;
 	unsigned short f;
+	u32 max_sdu = 0;
 	ktime_t txtime;
 	u8 hdr_len = 0;
 	int tso = 0;
@@ -1527,6 +1528,14 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
 		return NETDEV_TX_BUSY;
 	}
 
+	if (tx_ring->max_sdu > 0) {
+		max_sdu = tx_ring->max_sdu +
+			  (skb_vlan_tagged(skb) ? VLAN_HLEN : 0);
+
+		if (skb->len > max_sdu)
+			goto skb_drop;
+	}
+
 	if (!tx_ring->launchtime_enable)
 		goto done;
 
@@ -1606,6 +1615,11 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
 	dev_kfree_skb_any(first->skb);
 	first->skb = NULL;
 
+	return NETDEV_TX_OK;
+
+skb_drop:
+	dev_kfree_skb_any(skb);
+
 	return NETDEV_TX_OK;
 }
 
@@ -6039,6 +6053,7 @@ static int igc_tsn_clear_schedule(struct igc_adapter *adapter)
 
 		ring->start_time = 0;
 		ring->end_time = NSEC_PER_SEC;
+		ring->max_sdu = 0;
 	}
 
 	return 0;
@@ -6122,6 +6137,16 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
 		}
 	}
 
+	for (i = 0; i < adapter->num_tx_queues; i++) {
+		struct igc_ring *ring = adapter->tx_ring[i];
+		struct net_device *dev = adapter->netdev;
+
+		if (qopt->max_sdu[i])
+			ring->max_sdu = qopt->max_sdu[i] + dev->hard_header_len;
+		else
+			ring->max_sdu = 0;
+	}
+
 	return 0;
 }
 
@@ -6220,8 +6245,10 @@ static int igc_tc_query_caps(struct igc_adapter *adapter,
 
 		caps->broken_mqprio = true;
 
-		if (hw->mac.type == igc_i225)
+		if (hw->mac.type == igc_i225) {
+			caps->supports_queue_max_sdu = true;
 			caps->gate_mask_per_txq = true;
+		}
 
 		return 0;
 	}
-- 
2.17.1