renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2025-01-13 16:14:26 +08:00
Code

qlogic: netxen: remove ndo_poll_controller

Browse Source 
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.

netxen uses NAPI for TX completions, so we better let core
networking stack call the napi->poll() to avoid the capture.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Manish Chopra <manish.chopra@cavium.com>
Cc: Rahul Verma <rahul.verma@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2018-09-27 09:31:57 -07:00 committed by David S. Miller
parent 81b059b218
commit 3548fcf7d8
1 changed files with 0 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
View File

@ -72,9 +72,6 @@ static void netxen_schedule_work(struct netxen_adapter *adapter,
work_func_t func, int delay);
static void netxen_cancel_fw_work(struct netxen_adapter *adapter);
static int netxen_nic_poll(struct napi_struct *napi, int budget);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void netxen_nic_poll_controller(struct net_device *netdev);
#endif
static void netxen_create_sysfs_entries(struct netxen_adapter *adapter);
static void netxen_remove_sysfs_entries(struct netxen_adapter *adapter);
@ -581,9 +578,6 @@ static const struct net_device_ops netxen_netdev_ops = {
.ndo_tx_timeout = netxen_tx_timeout,
.ndo_fix_features = netxen_fix_features,
.ndo_set_features = netxen_set_features,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = netxen_nic_poll_controller,
#endif
};
static inline bool netxen_function_zero(struct pci_dev *pdev)
@ -2402,23 +2396,6 @@ static int netxen_nic_poll(struct napi_struct *napi, int budget)
return work_done;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void netxen_nic_poll_controller(struct net_device *netdev)
{
int ring;
struct nx_host_sds_ring *sds_ring;
struct netxen_adapter *adapter = netdev_priv(netdev);
struct netxen_recv_context *recv_ctx = &adapter->recv_ctx;
disable_irq(adapter->irq);
for (ring = 0; ring < adapter->max_sds_rings; ring++) {
sds_ring = &recv_ctx->sds_rings[ring];
netxen_intr(adapter->irq, sds_ring);
}
enable_irq(adapter->irq);
}
#endif
static int
nx_incr_dev_ref_cnt(struct netxen_adapter *adapter)
{