From 1690dcb49527934e83748e7b6db8501b33c3758a Mon Sep 17 00:00:00 2001 From: "Lijian.Zhang" Date: Thu, 19 Mar 2020 10:22:52 +0800 Subject: dpdk: false link down issue with ixgbe NIC This issue is observed with X520-2 NICs on FD.io lab Taishan server. After VPP booting up and bringing up the interfaces with command "set interface state up", it still shows link down status from the command "show hardware-interfaces". However, the hardware link status is actually up. dpdk_process() cannot get the hardware link status correctly via rte_eth_link_get_nowait(). In ixgbe_dev_link_update_share(), if the media type is fiber and the link is down, a flag (IXGBE_FLAG_NEED_LINK_CONFIG) is set. A callback to ixgbe_dev_setup_link_alarm_handler() is scheduled trying to set up the link and clear the flag afterwards. If the device is started or stopped before the flag is cleared, the scheduled callback is canceled. This causes the flag to remain set and subsequent calls to ixgbe_dev_link_update_share() return without trying to retrieve the link state because the flag is set. When the callback is canceled by either interface start or stop operation, in ixgbe_dev_cancel_link_thread(), after cancelling the callback/thread, unset the flag on the device to avoid this condition. Type: fix Signed-off-by: Lijian Zhang Reviewed-by: Honnappa Nagarahalli Reviewed-by: Jieqiang Wang Change-Id: I04de377dc048307a78a5b7109ebdfaf376d5e029 --- ...01-ixgbe-fix-false-link-down-timing-issue.patch | 66 ++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 build/external/patches/dpdk_20.02/0001-ixgbe-fix-false-link-down-timing-issue.patch (limited to 'build/external/patches') diff --git a/build/external/patches/dpdk_20.02/0001-ixgbe-fix-false-link-down-timing-issue.patch b/build/external/patches/dpdk_20.02/0001-ixgbe-fix-false-link-down-timing-issue.patch new file mode 100644 index 00000000000..6e0627b0338 --- /dev/null +++ b/build/external/patches/dpdk_20.02/0001-ixgbe-fix-false-link-down-timing-issue.patch @@ -0,0 +1,66 @@ +From 6033eeec2b029d99d4c0e46065f311fbbb2a1f1b Mon Sep 17 00:00:00 2001 +From: Lijian Zhang +Date: Wed, 18 Mar 2020 17:21:08 +0800 +Subject: [PATCH] ixgbe: fix false link down timing issue +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This issue is observed with X520-2 NICs on FD.io Taishan server. After +VPP booting up and bringing up the interfaces with command ‘set +interface state up’, it still shows link down status from +the command ‘show hardware-interfaces’. However, the hardware link +status is actually up. dpdk_process() cannot get the hardware link +status correctly via rte_eth_link_get_nowait(). + +In ixgbe_dev_link_update_share(), if the media type is fiber and the +link is down, a flag (IXGBE_FLAG_NEED_LINK_CONFIG) is set. A callback to +ixgbe_dev_setup_link_alarm_handler() is scheduled trying to set up the +link and clear the flag afterwards. + +If the device is started or stopped before the flag is cleared, the +scheduled callback is canceled. This causes the flag to remain set and +subsequent calls to ixgbe_dev_link_update_share() return without trying +to retrieve the link state because the flag is set. + +When the callback is canceled by either interface start or stop +operation, in ixgbe_dev_cancel_link_thread(), after cancelling the +callback/thread, unset the flag on the device to avoid this condition. + +Signed-off-by: Lijian Zhang +--- + drivers/net/ixgbe/ixgbe_ethdev.c | 5 ++++- + 1 file changed, 4 insertions(+), 1 deletion(-) + +diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c +index 23b3f5b0c..aa882cb8b 100644 +--- a/drivers/net/ixgbe/ixgbe_ethdev.c ++++ b/drivers/net/ixgbe/ixgbe_ethdev.c +@@ -4147,11 +4147,14 @@ static void + ixgbe_dev_cancel_link_thread(struct rte_eth_dev *dev) + { + struct ixgbe_adapter *ad = dev->data->dev_private; ++ struct ixgbe_interrupt *intr = ++ IXGBE_DEV_PRIVATE_TO_INTR(dev->data->dev_private); + void *retval; + + if (rte_atomic32_read(&ad->link_thread_running)) { + pthread_cancel(ad->link_thread_tid); + pthread_join(ad->link_thread_tid, &retval); ++ intr->flags &= ~IXGBE_FLAG_NEED_LINK_CONFIG; + rte_atomic32_clear(&ad->link_thread_running); + } + } +@@ -4262,8 +4265,8 @@ ixgbe_dev_link_update_share(struct rte_eth_dev *dev, + + if (link_up == 0) { + if (ixgbe_get_media_type(hw) == ixgbe_media_type_fiber) { +- intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG; + if (rte_atomic32_test_and_set(&ad->link_thread_running)) { ++ intr->flags |= IXGBE_FLAG_NEED_LINK_CONFIG; + if (rte_ctrl_thread_create(&ad->link_thread_tid, + "ixgbe-link-handler", + NULL, +-- +2.17.1 + -- cgit 1.2.3-korg