mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 22:23:27 +00:00
65 lines
2.2 KiB
Diff
65 lines
2.2 KiB
Diff
|
From fa204fc76c3936c55315ba9423fa7c920af2f9a9 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Ioana Radulescu <ruxandra.radulescu@nxp.com>
|
||
|
|
Date: Wed, 4 Sep 2019 20:32:56 +0300
|
||
|
|
Subject: [PATCH] dpaa2-eth: Add congestion group taildrop
|
||
|
|
|
||
|
|
The increase in number of ingress frame queues means we now risk
|
||
|
|
depleting the buffer pool before the FQ taildrop kicks in.
|
||
|
|
|
||
|
|
Congestion group taildrop allows us to control the number of frames
|
||
|
|
that can accumulate on a group of Rx frame queues belonging to the
|
||
|
|
same traffic class.
|
||
|
|
|
||
|
|
This setting coexists with the frame queue based taildrop: whichever
|
||
|
|
limit gets hit first triggers the frame drop.
|
||
|
|
|
||
|
|
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
|
||
|
|
---
|
||
|
|
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 16 ++++++++++++++++
|
||
|
|
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h | 9 +++++++++
|
||
|
|
2 files changed, 25 insertions(+)
|
||
|
|
|
||
|
|
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
|
||
|
|
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
|
||
|
|
@@ -1257,6 +1257,22 @@ static void dpaa2_eth_set_rx_taildrop(st
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
+ /* Congestion group taildrop: threshold is in frames, per group
|
||
|
|
+ * of FQs belonging to the same traffic class
|
||
|
|
+ */
|
||
|
|
+ td.threshold = DPAA2_ETH_CG_TAILDROP_THRESH(priv);
|
||
|
|
+ td.units = DPNI_CONGESTION_UNIT_FRAMES;
|
||
|
|
+ for (i = 0; i < dpaa2_eth_tc_count(priv); i++) {
|
||
|
|
+ err = dpni_set_taildrop(priv->mc_io, 0, priv->mc_token,
|
||
|
|
+ DPNI_CP_GROUP, DPNI_QUEUE_RX,
|
||
|
|
+ i, 0, &td);
|
||
|
|
+ if (err) {
|
||
|
|
+ netdev_err(priv->net_dev,
|
||
|
|
+ "dpni_set_taildrop(CG) failed\n");
|
||
|
|
+ return;
|
||
|
|
+ }
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
priv->rx_td_enabled = td.enable;
|
||
|
|
}
|
||
|
|
|
||
|
|
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
|
||
|
|
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
|
||
|
|
@@ -56,6 +56,15 @@
|
||
|
|
#define DPAA2_ETH_REFILL_THRESH \
|
||
|
|
(DPAA2_ETH_NUM_BUFS - DPAA2_ETH_BUFS_PER_CMD)
|
||
|
|
|
||
|
|
+/* Congestion group taildrop threshold: number of frames allowed to accumulate
|
||
|
|
+ * at any moment in a group of Rx queues belonging to the same traffic class.
|
||
|
|
+ * Choose value such that we don't risk depleting the buffer pool before the
|
||
|
|
+ * taildrop kicks in
|
||
|
|
+ */
|
||
|
|
+#define DPAA2_ETH_CG_TAILDROP_THRESH(priv) \
|
||
|
|
+ (DPAA2_ETH_MAX_FRAMES_PER_QUEUE * dpaa2_eth_queue_count(priv) / \
|
||
|
|
+ dpaa2_eth_tc_count(priv))
|
||
|
|
+
|
||
|
|
/* Maximum number of buffers that can be acquired/released through a single
|
||
|
|
* QBMan command
|
||
|
|
*/
|