Implement .ndo_tx_timeout for MANA so any stalled TX queue can be detected and a device-controlled port reset for all queues can be scheduled to a ordered workqueue. The reset for all queues on stall detection is recomended by hardware team.
Reviewed-by: Pavan Chebbi <[email protected]> Reviewed-by: Haiyang Zhang <[email protected]> Signed-off-by: Dipayaan Roy <[email protected]> --- Changes in v7: - Add enable_work in resume path. Changes in v6: - Rebased. Changes in v5: -Fixed commit message, used 'create_singlethread_workqueue' and fixed cleanup part. Changes in v4: -Fixed commit message, work initialization before registering netdev, fixed potential null pointer de-reference bug. Changes in v3: -Fixed commit meesage, removed rtnl_trylock and added disable_work_sync, fixed mana_queue_reset_work, and few cosmetics. Changes in v2: -Fixed cosmetic changes. --- --- drivers/net/ethernet/microsoft/mana/mana_en.c | 80 ++++++++++++++++++- include/net/mana/gdma.h | 7 +- include/net/mana/mana.h | 8 +- 3 files changed, 92 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index 1ad154f9db1a..d3e73a0bb442 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -299,6 +299,42 @@ static int mana_get_gso_hs(struct sk_buff *skb) return gso_hs; } +static void mana_per_port_queue_reset_work_handler(struct work_struct *work) +{ + struct mana_queue_reset_work *reset_queue_work = + container_of(work, struct mana_queue_reset_work, work); + + struct mana_port_context *apc = container_of(reset_queue_work, + struct mana_port_context, + queue_reset_work); + struct net_device *ndev = apc->ndev; + int err; + + rtnl_lock(); + + /* Pre-allocate buffers to prevent failure in mana_attach later */ + err = mana_pre_alloc_rxbufs(apc, ndev->mtu, apc->num_queues); + if (err) { + netdev_err(ndev, "Insufficient memory for reset post tx stall detection\n"); + goto out; + } + + err = mana_detach(ndev, false); + if (err) { + netdev_err(ndev, "mana_detach failed: %d\n", err); + goto dealloc_pre_rxbufs; + } + + err = mana_attach(ndev); + if (err) + netdev_err(ndev, "mana_attach failed: %d\n", err); + +dealloc_pre_rxbufs: + mana_pre_dealloc_rxbufs(apc); +out: + rtnl_unlock(); +} + netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev) { enum mana_tx_pkt_format pkt_fmt = MANA_SHORT_PKT_FMT; @@ -839,6 +875,23 @@ static int mana_change_mtu(struct net_device *ndev, int new_mtu) return err; } +static void mana_tx_timeout(struct net_device *netdev, unsigned int txqueue) +{ + struct mana_port_context *apc = netdev_priv(netdev); + struct mana_context *ac = apc->ac; + struct gdma_context *gc = ac->gdma_dev->gdma_context; + + /* Already in service, hence tx queue reset is not required.*/ + if (gc->in_service) + return; + + /* Note: If there are pending queue reset work for this port(apc), + * subsequent request queued up from here are ignored. This is because + * we are using the same work instance per port(apc). + */ + queue_work(ac->per_port_queue_reset_wq, &apc->queue_reset_work.work); +} + static int mana_shaper_set(struct net_shaper_binding *binding, const struct net_shaper *shaper, struct netlink_ext_ack *extack) @@ -924,6 +977,7 @@ static const struct net_device_ops mana_devops = { .ndo_bpf = mana_bpf, .ndo_xdp_xmit = mana_xdp_xmit, .ndo_change_mtu = mana_change_mtu, + .ndo_tx_timeout = mana_tx_timeout, .net_shaper_ops = &mana_shaper_ops, }; @@ -3287,6 +3341,8 @@ static int mana_probe_port(struct mana_context *ac, int port_idx, ndev->min_mtu = ETH_MIN_MTU; ndev->needed_headroom = MANA_HEADROOM; ndev->dev_port = port_idx; + /* Recommended timeout based on HW FPGA re-config scenario. */ + ndev->watchdog_timeo = 15 * HZ; SET_NETDEV_DEV(ndev, gc->dev); netif_set_tso_max_size(ndev, GSO_MAX_SIZE); @@ -3303,6 +3359,10 @@ static int mana_probe_port(struct mana_context *ac, int port_idx, if (err) goto reset_apc; + /* Initialize the per port queue reset work.*/ + INIT_WORK(&apc->queue_reset_work.work, + mana_per_port_queue_reset_work_handler); + netdev_lockdep_set_classes(ndev); ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; @@ -3492,6 +3552,7 @@ int mana_probe(struct gdma_dev *gd, bool resuming) { struct gdma_context *gc = gd->gdma_context; struct mana_context *ac = gd->driver_data; + struct mana_port_context *apc = NULL; struct device *dev = gc->dev; u8 bm_hostmode = 0; u16 num_ports = 0; @@ -3549,6 +3610,14 @@ int mana_probe(struct gdma_dev *gd, bool resuming) if (ac->num_ports > MAX_PORTS_IN_MANA_DEV) ac->num_ports = MAX_PORTS_IN_MANA_DEV; + ac->per_port_queue_reset_wq = + create_singlethread_workqueue("mana_per_port_queue_reset_wq"); + if (!ac->per_port_queue_reset_wq) { + dev_err(dev, "Failed to allocate per port queue reset workqueue\n"); + err = -ENOMEM; + goto out; + } + if (!resuming) { for (i = 0; i < ac->num_ports; i++) { err = mana_probe_port(ac, i, &ac->ports[i]); @@ -3565,6 +3634,8 @@ int mana_probe(struct gdma_dev *gd, bool resuming) } else { for (i = 0; i < ac->num_ports; i++) { rtnl_lock(); + apc = netdev_priv(ac->ports[i]); + enable_work(&apc->queue_reset_work.work); err = mana_attach(ac->ports[i]); rtnl_unlock(); /* we log the port for which the attach failed and stop @@ -3616,13 +3687,15 @@ void mana_remove(struct gdma_dev *gd, bool suspending) for (i = 0; i < ac->num_ports; i++) { ndev = ac->ports[i]; - apc = netdev_priv(ndev); if (!ndev) { if (i == 0) dev_err(dev, "No net device to remove\n"); goto out; } + apc = netdev_priv(ndev); + disable_work_sync(&apc->queue_reset_work.work); + /* All cleanup actions should stay after rtnl_lock(), otherwise * other functions may access partially cleaned up data. */ @@ -3649,6 +3722,11 @@ void mana_remove(struct gdma_dev *gd, bool suspending) mana_destroy_eq(ac); out: + if (ac->per_port_queue_reset_wq) { + destroy_workqueue(ac->per_port_queue_reset_wq); + ac->per_port_queue_reset_wq = NULL; + } + mana_gd_deregister_device(gd); if (suspending) diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h index eaa27483f99b..a59bd4035a99 100644 --- a/include/net/mana/gdma.h +++ b/include/net/mana/gdma.h @@ -598,6 +598,10 @@ enum { /* Driver can self reset on FPGA Reconfig EQE notification */ #define GDMA_DRV_CAP_FLAG_1_HANDLE_RECONFIG_EQE BIT(17) + +/* Driver detects stalled send queues and recovers them */ +#define GDMA_DRV_CAP_FLAG_1_HANDLE_STALL_SQ_RECOVERY BIT(18) + #define GDMA_DRV_CAP_FLAG_1_HW_VPORT_LINK_AWARE BIT(6) /* Driver supports linearizing the skb when num_sge exceeds hardware limit */ @@ -621,7 +625,8 @@ enum { GDMA_DRV_CAP_FLAG_1_HW_VPORT_LINK_AWARE | \ GDMA_DRV_CAP_FLAG_1_PERIODIC_STATS_QUERY | \ GDMA_DRV_CAP_FLAG_1_SKB_LINEARIZE | \ - GDMA_DRV_CAP_FLAG_1_PROBE_RECOVERY) + GDMA_DRV_CAP_FLAG_1_PROBE_RECOVERY | \ + GDMA_DRV_CAP_FLAG_1_HANDLE_STALL_SQ_RECOVERY) #define GDMA_DRV_CAP_FLAGS2 0 diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h index d7e089c6b694..cef78a871c7c 100644 --- a/include/net/mana/mana.h +++ b/include/net/mana/mana.h @@ -480,7 +480,7 @@ struct mana_context { struct mana_ethtool_hc_stats hc_stats; struct mana_eq *eqs; struct dentry *mana_eqs_debugfs; - + struct workqueue_struct *per_port_queue_reset_wq; /* Workqueue for querying hardware stats */ struct delayed_work gf_stats_work; bool hwc_timeout_occurred; @@ -492,9 +492,15 @@ struct mana_context { u32 link_event; }; +struct mana_queue_reset_work { + /* Work structure */ + struct work_struct work; +}; + struct mana_port_context { struct mana_context *ac; struct net_device *ndev; + struct mana_queue_reset_work queue_reset_work; u8 mac_addr[ETH_ALEN]; -- 2.43.0
