Author: sbruno
Date: Thu Jan 14 18:57:17 2016
New Revision: 294030
URL: https://svnweb.freebsd.org/changeset/base/294030
Log:
MFC r292670
Add support for sysctl knobs to live tune the tx packet processing limits
in igb and fix a wrap-around bug.
Submitted by: Jason (j...@nitrology.com)
Sponsored by: Limelight Networks
Modified:
stable/10/sys/dev/e1000/if_igb.c
stable/10/sys/dev/e1000/if_igb.h
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/e1000/if_igb.c
==============================================================================
--- stable/10/sys/dev/e1000/if_igb.c Thu Jan 14 18:53:54 2016
(r294029)
+++ stable/10/sys/dev/e1000/if_igb.c Thu Jan 14 18:57:17 2016
(r294030)
@@ -408,6 +408,13 @@ SYSCTL_INT(_hw_igb, OID_AUTO, rx_process
&igb_rx_process_limit, 0,
"Maximum number of received packets to process at a time, -1 means
unlimited");
+/* How many packets txeof tries to clean at a time */
+static int igb_tx_process_limit = -1;
+TUNABLE_INT("hw.igb.tx_process_limit", &igb_tx_process_limit);
+SYSCTL_INT(_hw_igb, OID_AUTO, tx_process_limit, CTLFLAG_RDTUN,
+ &igb_tx_process_limit, 0,
+ "Maximum number of sent packets to process at a time, -1 means unlimited");
+
#ifdef DEV_NETMAP /* see ixgbe.c for details */
#include <dev/netmap/if_igb_netmap.h>
#endif /* DEV_NETMAP */
@@ -526,11 +533,15 @@ igb_attach(device_t dev)
e1000_get_bus_info(&adapter->hw);
- /* Sysctl for limiting the amount of work done in the taskqueue */
+ /* Sysctls for limiting the amount of work done in the taskqueues */
igb_set_sysctl_value(adapter, "rx_processing_limit",
"max number of rx packets to process",
&adapter->rx_process_limit, igb_rx_process_limit);
+ igb_set_sysctl_value(adapter, "tx_processing_limit",
+ "max number of tx packets to process",
+ &adapter->tx_process_limit, igb_tx_process_limit);
+
/*
* Validate number of transmit and receive descriptors. It
* must not exceed hardware maximum, and must be multiple
@@ -3956,7 +3967,7 @@ igb_txeof(struct tx_ring *txr)
struct adapter *adapter = txr->adapter;
struct ifnet *ifp = adapter->ifp;
u32 work, processed = 0;
- u16 limit = txr->process_limit;
+ int limit = adapter->tx_process_limit;
struct igb_tx_buf *buf;
union e1000_adv_tx_desc *txd;
Modified: stable/10/sys/dev/e1000/if_igb.h
==============================================================================
--- stable/10/sys/dev/e1000/if_igb.h Thu Jan 14 18:53:54 2016
(r294029)
+++ stable/10/sys/dev/e1000/if_igb.h Thu Jan 14 18:57:17 2016
(r294030)
@@ -300,7 +300,6 @@ struct tx_ring {
volatile u16 tx_avail;
u16 next_avail_desc;
u16 next_to_clean;
- u16 process_limit;
u16 num_desc;
enum {
IGB_QUEUE_IDLE = 1,
@@ -479,6 +478,7 @@ struct adapter {
int has_manage;
int wol;
int rx_process_limit;
+ int tx_process_limit;
u16 vf_ifp; /* a VF interface */
bool in_detach; /* Used only in igb_ioctl */
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