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authorEric Dumazet <edumazet@google.com>2018-09-21 15:27:40 -0700
committerDavid S. Miller <davem@davemloft.net>2018-09-23 21:55:24 -0700
commitb80e71a986c2ab5677dc6b84923cd7030b690800 (patch)
tree070fe0ffefaab9b5d70159d079b1a9bd6f3c9a74 /drivers/net
parent93f62ad5e83a13e0c224dfca5ef40f90c09aad51 (diff)
downloadlinux-b80e71a986c2ab5677dc6b84923cd7030b690800.tar.bz2
ixgbe: remove ndo_poll_controller
As diagnosed by Song Liu, ndo_poll_controller() can be very dangerous on loaded hosts, since the cpu calling ndo_poll_controller() might steal all NAPI contexts (for all RX/TX queues of the NIC). This capture can last for unlimited amount of time, since one cpu is generally not able to drain all the queues under load. ixgbe uses NAPI for TX completions, so we better let core networking stack call the napi->poll() to avoid the capture. Reported-by: Song Liu <songliubraving@fb.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Tested-by: Song Liu <songliubraving@fb.com> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/intel/ixgbe/ixgbe_main.c25
1 files changed, 0 insertions, 25 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 9a23d33a47ed..f27d73a7bf16 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -8768,28 +8768,6 @@ static int ixgbe_del_sanmac_netdev(struct net_device *dev)
return err;
}
-#ifdef CONFIG_NET_POLL_CONTROLLER
-/*
- * Polling 'interrupt' - used by things like netconsole to send skbs
- * without having to re-enable interrupts. It's not called while
- * the interrupt routine is executing.
- */
-static void ixgbe_netpoll(struct net_device *netdev)
-{
- struct ixgbe_adapter *adapter = netdev_priv(netdev);
- int i;
-
- /* if interface is down do nothing */
- if (test_bit(__IXGBE_DOWN, &adapter->state))
- return;
-
- /* loop through and schedule all active queues */
- for (i = 0; i < adapter->num_q_vectors; i++)
- ixgbe_msix_clean_rings(0, adapter->q_vector[i]);
-}
-
-#endif
-
static void ixgbe_get_ring_stats64(struct rtnl_link_stats64 *stats,
struct ixgbe_ring *ring)
{
@@ -10251,9 +10229,6 @@ static const struct net_device_ops ixgbe_netdev_ops = {
.ndo_get_vf_config = ixgbe_ndo_get_vf_config,
.ndo_get_stats64 = ixgbe_get_stats64,
.ndo_setup_tc = __ixgbe_setup_tc,
-#ifdef CONFIG_NET_POLL_CONTROLLER
- .ndo_poll_controller = ixgbe_netpoll,
-#endif
#ifdef IXGBE_FCOE
.ndo_select_queue = ixgbe_select_queue,
.ndo_fcoe_ddp_setup = ixgbe_fcoe_ddp_get,