From c97c894dc7bcae28d0308dbcd010185079de4a28 Mon Sep 17 00:00:00 2001 From: Roopa Prabhu Date: Fri, 3 Jun 2011 14:35:17 +0000 Subject: [PATCH] enic: Add support for MTU change via port profile on a dynamic vnic enic driver gets MTU change notifications for MTU changes in the port profile associated to a dynamic vnic. This patch adds support in enic driver to set new MTU on the dynamic vnic and dynamically adjust its buffers with new MTU size in response to such notifications. Signed-off-by: Roopa Prabhu Signed-off-by: Vasanthy Kolluri Signed-off-by: David Wang Signed-off-by: Christian Benvenuti Signed-off-by: David S. Miller --- drivers/net/enic/enic.h | 3 +- drivers/net/enic/enic_main.c | 71 +++++++++++++++++++++++++++++++++--- 2 files changed, 68 insertions(+), 6 deletions(-) diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h index 38b351c7b97..e0d2ad181bb 100644 --- a/drivers/net/enic/enic.h +++ b/drivers/net/enic/enic.h @@ -32,7 +32,7 @@ #define DRV_NAME "enic" #define DRV_DESCRIPTION "Cisco VIC Ethernet NIC Driver" -#define DRV_VERSION "2.1.1.13" +#define DRV_VERSION "2.1.1.16" #define DRV_COPYRIGHT "Copyright 2008-2011 Cisco Systems, Inc" #define ENIC_BARS_MAX 6 @@ -74,6 +74,7 @@ struct enic { struct vnic_dev *vdev; struct timer_list notify_timer; struct work_struct reset; + struct work_struct change_mtu_work; struct msix_entry msix_entry[ENIC_INTR_MAX]; struct enic_msix_entry msix[ENIC_INTR_MAX]; u32 msg_enable; diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c index 5b087ebe632..1daf79b3616 100644 --- a/drivers/net/enic/enic_main.c +++ b/drivers/net/enic/enic_main.c @@ -423,11 +423,18 @@ static void enic_mtu_check(struct enic *enic) if (mtu && mtu != enic->port_mtu) { enic->port_mtu = mtu; - if (mtu < netdev->mtu) - netdev_warn(netdev, - "interface MTU (%d) set higher " - "than switch port MTU (%d)\n", - netdev->mtu, mtu); + if (enic_is_dynamic(enic)) { + mtu = max_t(int, ENIC_MIN_MTU, + min_t(int, ENIC_MAX_MTU, mtu)); + if (mtu != netdev->mtu) + schedule_work(&enic->change_mtu_work); + } else { + if (mtu < netdev->mtu) + netdev_warn(netdev, + "interface MTU (%d) set higher " + "than switch port MTU (%d)\n", + netdev->mtu, mtu); + } } } @@ -1688,6 +1695,9 @@ static int enic_change_mtu(struct net_device *netdev, int new_mtu) if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU) return -EINVAL; + if (enic_is_dynamic(enic)) + return -EOPNOTSUPP; + if (running) enic_stop(netdev); @@ -1704,6 +1714,55 @@ static int enic_change_mtu(struct net_device *netdev, int new_mtu) return 0; } +static void enic_change_mtu_work(struct work_struct *work) +{ + struct enic *enic = container_of(work, struct enic, change_mtu_work); + struct net_device *netdev = enic->netdev; + int new_mtu = vnic_dev_mtu(enic->vdev); + int err; + unsigned int i; + + new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu)); + + rtnl_lock(); + + /* Stop RQ */ + del_timer_sync(&enic->notify_timer); + + for (i = 0; i < enic->rq_count; i++) + napi_disable(&enic->napi[i]); + + vnic_intr_mask(&enic->intr[0]); + enic_synchronize_irqs(enic); + err = vnic_rq_disable(&enic->rq[0]); + if (err) { + netdev_err(netdev, "Unable to disable RQ.\n"); + return; + } + vnic_rq_clean(&enic->rq[0], enic_free_rq_buf); + vnic_cq_clean(&enic->cq[0]); + vnic_intr_clean(&enic->intr[0]); + + /* Fill RQ with new_mtu-sized buffers */ + netdev->mtu = new_mtu; + vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf); + /* Need at least one buffer on ring to get going */ + if (vnic_rq_desc_used(&enic->rq[0]) == 0) { + netdev_err(netdev, "Unable to alloc receive buffers.\n"); + return; + } + + /* Start RQ */ + vnic_rq_enable(&enic->rq[0]); + napi_enable(&enic->napi[0]); + vnic_intr_unmask(&enic->intr[0]); + enic_notify_timer_start(enic); + + rtnl_unlock(); + + netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu); +} + #ifdef CONFIG_NET_POLL_CONTROLLER static void enic_poll_controller(struct net_device *netdev) { @@ -2345,6 +2404,7 @@ static int __devinit enic_probe(struct pci_dev *pdev, enic->notify_timer.data = (unsigned long)enic; INIT_WORK(&enic->reset, enic_reset); + INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work); for (i = 0; i < enic->wq_count; i++) spin_lock_init(&enic->wq_lock[i]); @@ -2427,6 +2487,7 @@ static void __devexit enic_remove(struct pci_dev *pdev) struct enic *enic = netdev_priv(netdev); cancel_work_sync(&enic->reset); + cancel_work_sync(&enic->change_mtu_work); unregister_netdev(netdev); enic_dev_deinit(enic); vnic_dev_close(enic->vdev); -- 2.39.2