From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roger B Melton Subject: Re: [PATCH v4] net/ixgbe: ensure link status is updated Date: Wed, 17 May 2017 09:31:09 -0400 Message-ID: <1160d98e-93a7-c14c-82a9-0944a2df6e5c@cisco.com> References: <49759EB36A64CF4892C1AFEC9231E8D650A662DC@PGSMSX101.gar.corp.intel.com> <1493305422-10611-1-git-send-email-laurent.hardy@6wind.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: ferruh.yigit@intel.com, helin.zhang@intel.com, konstantin.ananyev@intel.com, olivier.matz@6wind.com To: Laurent Hardy , dev@dpdk.org, wei.dai@intel.com Return-path: Received: from alln-iport-3.cisco.com (alln-iport-3.cisco.com [173.37.142.90]) by dpdk.org (Postfix) with ESMTP id 16A8F292D for ; Wed, 17 May 2017 15:31:10 +0200 (CEST) In-Reply-To: <1493305422-10611-1-git-send-email-laurent.hardy@6wind.com> Content-Language: en-US List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Hi Laurent/Wei, As I continue to integrate DPDK 17.05 into my application, I have hit another issue with this patch while testing in a VM with multispeed fiber ixgbe PCI passthrough. My application periodically invokes rte_eth_link_get_nowait() to detect link state changes. If the link is down (no cable or far end disabled), ixgbe_setup_link() will not return for ~1.3seconds due to the link setup algorithm in ixgbe_common.c:ixgbe_multispeed_fiber(): + if ((intr->flags & IXGBE_FLAG_NEED_LINK_CONFIG) && + hw->mac.ops.get_media_type(hw) == ixgbe_media_type_fiber) { + speed = hw->phy.autoneg_advertised; + if (!speed) + ixgbe_get_link_capabilities(hw, &speed, &autoneg); + ixgbe_setup_link(hw, speed, true); + } + I have two questions: * Shouldn't we avoid the link setup cost if the caller has specified not to wait_to_complete? * If the concern is speed may not be properly configured, shouldn't the link setup be deferred until state changes link up thus minimizing the delays enforced in ixgbe_multispeed_fiber()? Regards, -Roger On 4/27/17 11:03 AM, Laurent Hardy wrote: > In case of fiber and link speed set to 1Gb at peer side (with autoneg > or with defined speed), link status could be not properly updated at > time cable is plugged-in. > Indeed if cable was not plugged when device has been configured and > started then link status will not be updated properly with new speed > as no link setup will be triggered. > > To avoid this issue, IXGBE_FLAG_NEED_LINK_CONFIG is set to try a link > setup each time link_update() is triggered and current link status is > down. When cable is plugged-in, link setup will be performed via > ixgbe_setup_link(). > > Signed-off-by: Laurent Hardy > --- > Hi Wei, please find enclosed patch v4, tested using testpmd. > > v1 -> v2: > - rebase on top of head (change flag to 1<<4) > - fix regression with copper links: only update link for fiber links > > v2 -> v3: > - remove unnescessary check on speed mask if autoneg is false > > v3 -> v4: > - remove default speed set to 10Gb if autoneg is false, rely on > ixgbe_get_link_capabilities( ) instead. > --- > drivers/net/ixgbe/ixgbe_ethdev.c | 14 ++++++++++++++ > drivers/net/ixgbe/ixgbe_ethdev.h | 1 + > 2 files changed, 15 insertions(+) > > diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c > index 7b856bb..8a0c0a7 100644 > --- a/drivers/net/ixgbe/ixgbe_ethdev.c > +++ b/drivers/net/ixgbe/ixgbe_ethdev.c > @@ -3782,8 +3782,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete) > struct ixgbe_hw *hw = IXGBE_DEV_PRIVATE_TO_HW(dev->data->dev_private); > struct rte_eth_link link, old; > ixgbe_link_speed link_speed = IXGBE_LINK_SPEED_UNKNOWN; > + struct ixgbe_interrupt *intr = > + IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private); > int link_up; > int diag; > + u32 speed = 0; > + bool autoneg = false; > > link.link_status = ETH_LINK_DOWN; > link.link_speed = 0; > @@ -3793,6 +3797,14 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete) > > hw->mac.get_link_status = true; > > + if ((intr->flags & IXGBE_FLAG_NEED_LINK_CONFIG) && > + hw->mac.ops.get_media_type(hw) == ixgbe_media_type_fiber) { > + speed = hw->phy.autoneg_advertised; > + if (!speed) > + ixgbe_get_link_capabilities(hw, &speed, &autoneg); > + ixgbe_setup_link(hw, speed, true); > + } > + > /* check if it needs to wait to complete, if lsc interrupt is enabled */ > if (wait_to_complete == 0 || dev->data->dev_conf.intr_conf.lsc != 0) > diag = ixgbe_check_link(hw, &link_speed, &link_up, 0); > @@ -3810,10 +3822,12 @@ ixgbe_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete) > > if (link_up == 0) { > rte_ixgbe_dev_atomic_write_link_status(dev, &link); > + intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG; > if (link.link_status == old.link_status) > return -1; > return 0; > } > + intr->flags &= ~IXGBE_FLAG_NEED_LINK_CONFIG; > link.link_status = ETH_LINK_UP; > link.link_duplex = ETH_LINK_FULL_DUPLEX; > > diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h > index 5176b02..b576a6f 100644 > --- a/drivers/net/ixgbe/ixgbe_ethdev.h > +++ b/drivers/net/ixgbe/ixgbe_ethdev.h > @@ -45,6 +45,7 @@ > #define IXGBE_FLAG_MAILBOX (uint32_t)(1 << 1) > #define IXGBE_FLAG_PHY_INTERRUPT (uint32_t)(1 << 2) > #define IXGBE_FLAG_MACSEC (uint32_t)(1 << 3) > +#define IXGBE_FLAG_NEED_LINK_CONFIG (uint32_t)(1 << 4) > > /* > * Defines that were not part of ixgbe_type.h as they are not used by the