diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/701-net-0292-staging-fsl_ppfe-eth-Avoid-packet-drop-at-TMU-queues.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/701-net-0292-staging-fsl_ppfe-eth-Avoid-packet-drop-at-TMU-queues.patch | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0292-staging-fsl_ppfe-eth-Avoid-packet-drop-at-TMU-queues.patch b/target/linux/layerscape/patches-5.4/701-net-0292-staging-fsl_ppfe-eth-Avoid-packet-drop-at-TMU-queues.patch new file mode 100644 index 0000000000..eeea3740dd --- /dev/null +++ b/target/linux/layerscape/patches-5.4/701-net-0292-staging-fsl_ppfe-eth-Avoid-packet-drop-at-TMU-queues.patch @@ -0,0 +1,87 @@ +From 8b99b4595d2b5f4d0b2252b16de83572e03b337a Mon Sep 17 00:00:00 2001 +From: Kavi Akhila-B46177 <akhila.kavi@nxp.com> +Date: Thu, 2 Nov 2017 12:05:35 +0530 +Subject: [PATCH] staging: fsl_ppfe/eth: Avoid packet drop at TMU queues + +Added flow control between TMU queues and PFE Linux driver, +based on TMU credits availability. +Added tx_qos module parameter to control this behavior. +Use queue-0 as default queue to transmit packets. + +Signed-off-by: Calvin Johnson <calvin.johnson@nxp.com> +Signed-off-by: Akhila Kavi <akhila.kavi@nxp.com> +Signed-off-by: Anjaneyulu Jagarlmudi <anji.jagarlmudi@nxp.com> +--- + drivers/staging/fsl_ppfe/pfe_eth.c | 17 +++++++++++++---- + drivers/staging/fsl_ppfe/pfe_hif_lib.c | 7 +++++-- + 2 files changed, 18 insertions(+), 6 deletions(-) + +--- a/drivers/staging/fsl_ppfe/pfe_eth.c ++++ b/drivers/staging/fsl_ppfe/pfe_eth.c +@@ -293,10 +293,10 @@ static int pfe_eth_sysfs_init(struct net + /* Initialize the default values */ + + /* +- * By default, packets without conntrack will use this default high ++ * By default, packets without conntrack will use this default low + * priority queue + */ +- priv->default_priority = 15; ++ priv->default_priority = 0; + + /* Create our sysfs files */ + err = device_create_file(&ndev->dev, &dev_attr_default_priority); +@@ -1566,10 +1566,17 @@ static int pfe_eth_might_stop_tx(struct + unsigned int n_segs) + { + ktime_t kt; ++ int tried = 0; + ++try_again: + if (unlikely((__hif_tx_avail(&pfe->hif) < n_desc) || +- (hif_lib_tx_avail(&priv->client, queuenum) < n_desc) || ++ (hif_lib_tx_avail(&priv->client, queuenum) < n_desc) || + (hif_lib_tx_credit_avail(pfe, priv->id, queuenum) < n_segs))) { ++ if (!tried) { ++ __hif_lib_update_credit(&priv->client, queuenum); ++ tried = 1; ++ goto try_again; ++ } + #ifdef PFE_ETH_TX_STATS + if (__hif_tx_avail(&pfe->hif) < n_desc) { + priv->stop_queue_hif[queuenum]++; +@@ -1692,8 +1699,10 @@ static void pfe_eth_flush_tx(struct pfe_ + + netif_info(priv, tx_done, priv->ndev, "%s\n", __func__); + +- for (ii = 0; ii < emac_txq_cnt; ii++) ++ for (ii = 0; ii < emac_txq_cnt; ii++) { + pfe_eth_flush_txQ(priv, ii, 0, 0); ++ __hif_lib_update_credit(&priv->client, ii); ++ } + } + + void pfe_tx_get_req_desc(struct sk_buff *skb, unsigned int *n_desc, unsigned int +--- a/drivers/staging/fsl_ppfe/pfe_hif_lib.c ++++ b/drivers/staging/fsl_ppfe/pfe_hif_lib.c +@@ -34,7 +34,10 @@ + + unsigned int lro_mode; + unsigned int page_mode; +-unsigned int tx_qos; ++unsigned int tx_qos = 1; ++module_param(tx_qos, uint, 0444); ++MODULE_PARM_DESC(tx_qos, "0: disable ,\n" ++ "1: enable (default), guarantee no packet drop at TMU level\n"); + unsigned int pfe_pkt_size; + unsigned int pfe_pkt_headroom; + unsigned int emac_txq_cnt; +@@ -576,7 +579,7 @@ void __hif_lib_update_credit(struct hif_ + + if (tx_qos) { + tmu_tx_packets = be32_to_cpu(pe_dmem_read(TMU0_ID + +- client->id, TMU_DM_TX_TRANS, 4)); ++ client->id, (TMU_DM_TX_TRANS + (queue * 4)), 4)); + + /* tx_packets counter overflowed */ + if (tmu_tx_packets > |