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