diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0197-dpaa2-eth-Add-congestion-group-taildrop.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0197-dpaa2-eth-Add-congestion-group-taildrop.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0197-dpaa2-eth-Add-congestion-group-taildrop.patch b/target/linux/layerscape/patches-5.4/701-net-0197-dpaa2-eth-Add-congestion-group-taildrop.patch new file mode 100644 index 0000000000..9125b94351 --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0197-dpaa2-eth-Add-congestion-group-taildrop.patch @@ -0,0 +1,64 @@ +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 + */ |