target/linux/layerscape/patches-5.4/701-net-0029-sdk_dpaa-update-the-xmit-timestamp-to-avoid-watchdog.patch

   1 From 7207c6eaead4fbcf6dfec2a185550cd30aba5071 Mon Sep 17 00:00:00 2001
   2 From: Camelia Groza <camelia.groza@nxp.com>
   3 Date: Thu, 7 Sep 2017 14:49:09 +0300
   4 Subject: [PATCH] sdk_dpaa: update the xmit timestamp to avoid watchdog
   5  timeouts
   6
   7 Update txq0's trans_start in order to prevent the netdev watchdog from
   8 triggering too quickly. Since we set the LLTX flag, the stack won't update
   9 the jiffies for other tx queues. Prevent the watchdog from checking the
  10 other tx queues by adding the NETIF_HW_ACCEL_MQ flag.
  11
  12 Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
  13 ---
  14  drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.c    | 3 +++
  15  drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c | 1 +
  16  include/linux/netdev_features.h                       | 2 ++
  17  net/sched/sch_generic.c                               | 7 +++++++
  18  4 files changed, 13 insertions(+)
  19
  20 --- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.c
  21 +++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.c
  22 @@ -772,6 +772,9 @@ static int dpa_private_netdev_init(struc
  23         /* Advertise GRO support */
  24         net_dev->features |= NETIF_F_GRO;
  25
  26 +       /* Advertise NETIF_F_HW_ACCEL_MQ to avoid Tx timeout warnings */
  27 +       net_dev->features |= NETIF_F_HW_ACCEL_MQ;
  28 +
  29         return dpa_netdev_init(net_dev, mac_addr, tx_timeout);
  30  }
  31
  32 --- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
  33 +++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
  34 @@ -1140,6 +1140,7 @@ int __hot dpa_tx_extended(struct sk_buff
  35         if (unlikely(dpa_xmit(priv, percpu_stats, &fd, egress_fq, conf_fq) < 0))
  36                 goto xmit_failed;
  37
  38 +       netif_trans_update(net_dev);
  39         return NETDEV_TX_OK;
  40
  41  xmit_failed:
  42 --- a/include/linux/netdev_features.h
  43 +++ b/include/linux/netdev_features.h
  44 @@ -77,6 +77,7 @@ enum {
  45         NETIF_F_RX_UDP_TUNNEL_PORT_BIT, /* Offload of RX port for UDP tunnels */
  46         NETIF_F_HW_TLS_TX_BIT,          /* Hardware TLS TX offload */
  47         NETIF_F_HW_TLS_RX_BIT,          /* Hardware TLS RX offload */
  48 +       NETIF_F_HW_ACCEL_MQ_BIT,        /* Hardware-accelerated multiqueue */
  49
  50         NETIF_F_GRO_HW_BIT,             /* Hardware Generic receive offload */
  51         NETIF_F_HW_TLS_RECORD_BIT,      /* Offload TLS record */
  52 @@ -150,6 +151,7 @@ enum {
  53  #define NETIF_F_GSO_UDP_L4     __NETIF_F(GSO_UDP_L4)
  54  #define NETIF_F_HW_TLS_TX      __NETIF_F(HW_TLS_TX)
  55  #define NETIF_F_HW_TLS_RX      __NETIF_F(HW_TLS_RX)
  56 +#define NETIF_F_HW_ACCEL_MQ    __NETIF_F(HW_ACCEL_MQ)
  57
  58  /* Finds the next feature with the highest number of the range of start till 0.
  59   */
  60 --- a/net/sched/sch_generic.c
  61 +++ b/net/sched/sch_generic.c
  62 @@ -440,6 +440,13 @@ static void dev_watchdog(struct timer_li
  63                                         txq->trans_timeout++;
  64                                         break;
  65                                 }
  66 +
  67 +                               /* Devices with HW_ACCEL_MQ have multiple txqs
  68 +                                * but update only the first one's transmission
  69 +                                * timestamp so avoid checking the rest.
  70 +                                */
  71 +                               if (dev->features & NETIF_F_HW_ACCEL_MQ)
  72 +                                       break;
  73                         }
  74
  75                         if (some_queue_timedout) {