From 1c103cf819da7af23c96d968d3172b4358970502 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 18 Mar 2020 13:54:47 +0100 Subject: [PATCH] s390/qeth: remove prio-queueing support for z/VM NICs z/VM NICs don't offer HW QoS for TX rings. So just use netdev_pick_tx() to distribute the connections equally over all enabled TX queues. We start with just 1 enabled TX queue (this matches the typical configuration without prio-queueing). A follow-on patch will allow users to enable additional TX queues. Signed-off-by: Julian Wiedmann Signed-off-by: David S. Miller --- drivers/s390/net/qeth_core.h | 1 + drivers/s390/net/qeth_core_main.c | 56 ++++++++++++++++++++++++--------------- drivers/s390/net/qeth_core_sys.c | 2 +- drivers/s390/net/qeth_l2_main.c | 8 +++++- drivers/s390/net/qeth_l3_main.c | 7 ++++- 5 files changed, 49 insertions(+), 25 deletions(-) diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index 962be94ed3ca..94cd39631eee 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -1053,6 +1053,7 @@ int qeth_configure_cq(struct qeth_card *, enum qeth_cq); int qeth_hw_trap(struct qeth_card *, enum qeth_diags_trap_action); void qeth_trace_features(struct qeth_card *); int qeth_setassparms_cb(struct qeth_card *, struct qeth_reply *, unsigned long); +int qeth_setup_netdev(struct qeth_card *card); int qeth_set_features(struct net_device *, netdev_features_t); void qeth_enable_hw_features(struct net_device *dev); netdev_features_t qeth_fix_features(struct net_device *, netdev_features_t); diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 767cef04c9d8..f13495d9209b 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -1244,9 +1244,12 @@ EXPORT_SYMBOL_GPL(qeth_drain_output_queues); static int qeth_osa_set_output_queues(struct qeth_card *card, bool single) { - unsigned int count = single ? 1 : card->dev->num_tx_queues; + unsigned int max = single ? 1 : card->dev->num_tx_queues; + unsigned int count; int rc; + count = IS_VM_NIC(card) ? min(max, card->dev->real_num_tx_queues) : max; + rtnl_lock(); rc = netif_set_real_num_tx_queues(card->dev, count); rtnl_unlock(); @@ -1254,16 +1257,16 @@ static int qeth_osa_set_output_queues(struct qeth_card *card, bool single) if (rc) return rc; - if (card->qdio.no_out_queues == count) + if (card->qdio.no_out_queues == max) return 0; if (atomic_read(&card->qdio.state) != QETH_QDIO_UNINITIALIZED) qeth_free_qdio_queues(card); - if (count == 1) + if (max == 1 && card->qdio.do_prio_queueing != QETH_PRIOQ_DEFAULT) dev_info(&card->gdev->dev, "Priority Queueing not supported\n"); - card->qdio.no_out_queues = count; + card->qdio.no_out_queues = max; return 0; } @@ -5987,22 +5990,8 @@ static struct net_device *qeth_alloc_netdev(struct qeth_card *card) SET_NETDEV_DEV(dev, &card->gdev->dev); netif_carrier_off(dev); - if (IS_OSN(card)) { - dev->ethtool_ops = &qeth_osn_ethtool_ops; - } else { - dev->ethtool_ops = &qeth_ethtool_ops; - dev->priv_flags &= ~IFF_TX_SKB_SHARING; - dev->hw_features |= NETIF_F_SG; - dev->vlan_features |= NETIF_F_SG; - if (IS_IQD(card)) { - dev->features |= NETIF_F_SG; - if (netif_set_real_num_tx_queues(dev, - QETH_IQD_MIN_TXQ)) { - free_netdev(dev); - return NULL; - } - } - } + dev->ethtool_ops = IS_OSN(card) ? &qeth_osn_ethtool_ops : + &qeth_ethtool_ops; return dev; } @@ -6018,6 +6007,28 @@ struct net_device *qeth_clone_netdev(struct net_device *orig) return clone; } +int qeth_setup_netdev(struct qeth_card *card) +{ + struct net_device *dev = card->dev; + unsigned int num_tx_queues; + + dev->priv_flags &= ~IFF_TX_SKB_SHARING; + dev->hw_features |= NETIF_F_SG; + dev->vlan_features |= NETIF_F_SG; + + if (IS_IQD(card)) { + dev->features |= NETIF_F_SG; + num_tx_queues = QETH_IQD_MIN_TXQ; + } else if (IS_VM_NIC(card)) { + num_tx_queues = 1; + } else { + num_tx_queues = dev->real_num_tx_queues; + } + + return netif_set_real_num_tx_queues(dev, num_tx_queues); +} +EXPORT_SYMBOL_GPL(qeth_setup_netdev); + static int qeth_core_probe_device(struct ccwgroup_device *gdev) { struct qeth_card *card; @@ -6057,12 +6068,13 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev) goto err_card; } + qeth_determine_capabilities(card); + qeth_set_blkt_defaults(card); + card->qdio.no_out_queues = card->dev->num_tx_queues; rc = qeth_update_from_chp_desc(card); if (rc) goto err_chp_desc; - qeth_determine_capabilities(card); - qeth_set_blkt_defaults(card); enforced_disc = qeth_enforce_discipline(card); switch (enforced_disc) { diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c index 78cae61bc924..533a7f26dbe1 100644 --- a/drivers/s390/net/qeth_core_sys.c +++ b/drivers/s390/net/qeth_core_sys.c @@ -176,7 +176,7 @@ static ssize_t qeth_dev_prioqing_store(struct device *dev, struct qeth_card *card = dev_get_drvdata(dev); int rc = 0; - if (IS_IQD(card)) + if (IS_IQD(card) || IS_VM_NIC(card)) return -EOPNOTSUPP; mutex_lock(&card->conf_mutex); diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c index 8ba4ac2a5b47..71eb2d9bfbb7 100644 --- a/drivers/s390/net/qeth_l2_main.c +++ b/drivers/s390/net/qeth_l2_main.c @@ -571,7 +571,9 @@ static u16 qeth_l2_select_queue(struct net_device *dev, struct sk_buff *skb, return qeth_iqd_select_queue(dev, skb, qeth_get_ether_cast_type(skb), sb_dev); - return qeth_get_priority_queue(card, skb); + + return IS_VM_NIC(card) ? netdev_pick_tx(dev, skb, sb_dev) : + qeth_get_priority_queue(card, skb); } static const struct device_type qeth_l2_devtype = { @@ -659,6 +661,10 @@ static int qeth_l2_setup_netdev(struct qeth_card *card, bool carrier_ok) goto add_napi; } + rc = qeth_setup_netdev(card); + if (rc) + return rc; + card->dev->needed_headroom = sizeof(struct qeth_hdr); card->dev->netdev_ops = &qeth_l2_netdev_ops; card->dev->priv_flags |= IFF_UNICAST_FLT; diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index 8a803d6c9357..81ec0d2b7ea5 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -1880,7 +1880,8 @@ static u16 qeth_l3_osa_select_queue(struct net_device *dev, struct sk_buff *skb, { struct qeth_card *card = dev->ml_priv; - return qeth_get_priority_queue(card, skb); + return IS_VM_NIC(card) ? netdev_pick_tx(dev, skb, sb_dev) : + qeth_get_priority_queue(card, skb); } static const struct net_device_ops qeth_l3_netdev_ops = { @@ -1922,6 +1923,10 @@ static int qeth_l3_setup_netdev(struct qeth_card *card, bool carrier_ok) unsigned int headroom; int rc; + rc = qeth_setup_netdev(card); + if (rc) + return rc; + if (IS_OSD(card) || IS_OSX(card)) { if ((card->info.link_type == QETH_LINK_TYPE_LANE_TR) || (card->info.link_type == QETH_LINK_TYPE_HSTR)) { -- 2.11.0