From 95447461fa9ae3d879c84c1d2f2f8da2fdcd8f34 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Thu, 31 May 2012 12:42:26 +0000 Subject: [PATCH] ixgbe: fix RAR entry counting for generic and fdb_add() Do RAR entry accounting correctly so that errors are reported and promisc mode is set correctly when the number of entries exceeds the hardware limits. This can happen with many macvlan devices attached to the PF or by adding many fdb entries in SR-IOV modes. Also this includes a small refactor to fdb_add() to avoid having so many nested if/else statements after adding a check for the number or RAR entries. The max entries for the PF is currently 16 we allow 15 additional entries to account for the defined MAC. Signed-off-by: John Fastabend Tested-by: Phil Schmitt Tested-by: Ross Brattain Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 27 +++++++++++++------ 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index b376926af89..84370e78a0f 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -3441,14 +3441,18 @@ static int ixgbe_write_uc_addr_list(struct net_device *netdev) { struct ixgbe_adapter *adapter = netdev_priv(netdev); struct ixgbe_hw *hw = &adapter->hw; - unsigned int rar_entries = IXGBE_MAX_PF_MACVLANS; + unsigned int rar_entries = hw->mac.num_rar_entries - 1; int count = 0; + /* In SR-IOV mode significantly less RAR entries are available */ + if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) + rar_entries = IXGBE_MAX_PF_MACVLANS - 1; + /* return ENOMEM indicating insufficient memory for addresses */ if (netdev_uc_count(netdev) > rar_entries) return -ENOMEM; - if (!netdev_uc_empty(netdev) && rar_entries) { + if (!netdev_uc_empty(netdev)) { struct netdev_hw_addr *ha; /* return error if we do not support writing to RAR table */ if (!hw->mac.ops.set_rar) @@ -6861,7 +6865,10 @@ static int ixgbe_ndo_fdb_add(struct ndmsg *ndm, u16 flags) { struct ixgbe_adapter *adapter = netdev_priv(dev); - int err = -EOPNOTSUPP; + int err; + + if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) + return -EOPNOTSUPP; if (ndm->ndm_state & NUD_PERMANENT) { pr_info("%s: FDB only supports static addresses\n", @@ -6869,13 +6876,17 @@ static int ixgbe_ndo_fdb_add(struct ndmsg *ndm, return -EINVAL; } - if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) { - if (is_unicast_ether_addr(addr)) + if (is_unicast_ether_addr(addr)) { + u32 rar_uc_entries = IXGBE_MAX_PF_MACVLANS; + + if (netdev_uc_count(dev) < rar_uc_entries) err = dev_uc_add_excl(dev, addr); - else if (is_multicast_ether_addr(addr)) - err = dev_mc_add_excl(dev, addr); else - err = -EINVAL; + err = -ENOMEM; + } else if (is_multicast_ether_addr(addr)) { + err = dev_mc_add_excl(dev, addr); + } else { + err = -EINVAL; } /* Only return duplicate errors if NLM_F_EXCL is set */ -- 2.41.0