From dd57c9308afff61e4c157d0a7260695fe2f9a98c Mon Sep 17 00:00:00 2001 From: Alex Estrin Date: Wed, 6 Aug 2014 14:40:32 -0400 Subject: [PATCH] IB/ipoib: Avoid multicast join attempts with invalid P_key Currently, the parent interface keeps sending broadcast group join requests even if p_key index 0 is invalid, which is possible/common in virtualized environments where a VF has been probed to VM but the actual P_key configuration has not yet been assigned by the management software. This creates unnecessary noise on the fabric and in the kernel logs: ib0: multicast join failed for ff12:401b:8000:0000:0000:0000:ffff:ffff, status -22 The original code run the multicast task regardless of the actual P_key value, which can be avoided. The fix is to re-init resources and bring interface up only if P_key index 0 is valid either when starting up or on PKEY_CHANGE event. Fixes: c290414169 ("IPoIB: Fix pkey change flow for virtualization environments") Reviewed-by: Ira Weiny Signed-off-by: Alex Estrin Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/ipoib/ipoib_ib.c | 80 ++++++++++++++++--------------- drivers/infiniband/ulp/ipoib/ipoib_main.c | 11 ++--- 2 files changed, 46 insertions(+), 45 deletions(-) diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c index 9dcb2c9..72626c34 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c @@ -669,12 +669,13 @@ int ipoib_ib_dev_open(struct net_device *dev, int flush) struct ipoib_dev_priv *priv = netdev_priv(dev); int ret; - if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) { - ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey); - clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); + ipoib_pkey_dev_check_presence(dev); + + if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) { + ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey, + (!(priv->pkey & 0x7fff) ? "Invalid" : "not found")); return -1; } - set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); ret = ipoib_init_qp(dev); if (ret) { @@ -712,9 +713,10 @@ dev_stop: void ipoib_pkey_dev_check_presence(struct net_device *dev) { struct ipoib_dev_priv *priv = netdev_priv(dev); - u16 pkey_index = 0; - if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) + if (!(priv->pkey & 0x7fff) || + ib_find_pkey(priv->ca, priv->port, priv->pkey, + &priv->pkey_index)) clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); else set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); @@ -958,13 +960,27 @@ static inline int update_parent_pkey(struct ipoib_dev_priv *priv) return 1; } +/* + * returns 0 if pkey value was found in a different slot. + */ +static inline int update_child_pkey(struct ipoib_dev_priv *priv) +{ + u16 old_index = priv->pkey_index; + + priv->pkey_index = 0; + ipoib_pkey_dev_check_presence(priv->dev); + + if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && + (old_index == priv->pkey_index)) + return 1; + return 0; +} static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, enum ipoib_flush_level level) { struct ipoib_dev_priv *cpriv; struct net_device *dev = priv->dev; - u16 new_index; int result; down_read(&priv->vlan_rwsem); @@ -978,19 +994,20 @@ static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, up_read(&priv->vlan_rwsem); - if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) { - /* for non-child devices must check/update the pkey value here */ - if (level == IPOIB_FLUSH_HEAVY) { - if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) - ipoib_pkey_open(priv); - else - update_parent_pkey(priv); - } + if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) && + level != IPOIB_FLUSH_HEAVY) { ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n"); return; } if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) { + /* interface is down. update pkey and leave. */ + if (level == IPOIB_FLUSH_HEAVY) { + if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) + update_parent_pkey(priv); + else + update_child_pkey(priv); + } ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n"); return; } @@ -1000,19 +1017,13 @@ static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, * (parent) devices should always takes what present in pkey index 0 */ if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) { - if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) { - clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags); - ipoib_ib_dev_down(dev, 0); - ipoib_ib_dev_stop(dev, 0); - return; - } - /* restart QP only if P_Key index is changed */ - if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) && - new_index == priv->pkey_index) { + result = update_child_pkey(priv); + if (result) { + /* restart QP only if P_Key index is changed */ ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n"); return; } - priv->pkey_index = new_index; + } else { result = update_parent_pkey(priv); /* restart QP only if P_Key value changed */ @@ -1032,8 +1043,12 @@ static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, ipoib_ib_dev_down(dev, 0); if (level == IPOIB_FLUSH_HEAVY) { - ipoib_ib_dev_stop(dev, 0); - ipoib_ib_dev_open(dev, 0); + if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) + ipoib_ib_dev_stop(dev, 0); + if (ipoib_ib_dev_open(dev, 0) != 0) + return; + if (netif_queue_stopped(dev)) + netif_start_queue(dev); } /* @@ -1088,15 +1103,4 @@ void ipoib_ib_dev_cleanup(struct net_device *dev) ipoib_transport_dev_cleanup(dev); } -void ipoib_pkey_open(struct ipoib_dev_priv *priv) -{ - - if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) - return; - - ipoib_pkey_dev_check_presence(priv->dev); - - if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) - ipoib_open(priv->dev); -} diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 1bf994a..217cb77 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -108,14 +108,11 @@ int ipoib_open(struct net_device *dev) set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags); - - ipoib_pkey_dev_check_presence(dev); - - if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) - return 0; - - if (ipoib_ib_dev_open(dev, 1)) + if (ipoib_ib_dev_open(dev, 1)) { + if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) + return 0; goto err_disable; + } if (ipoib_ib_dev_up(dev)) goto err_stop; -- 2.7.4