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Add support for sysctl knobs to live tune the tx packet processing limits

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in igb and fix a wrap-around bug.

Reviewed by:	hiren
Obtained from:  Jason (j@nitrology.com)
MFC after:	2 weeks
Sponsored by:	LimeLight Networks
Differential Revision:	https://reviews.freebsd.org/D4039
This commit is contained in:
sbruno 2015-12-23 21:54:05 +00:00
parent b778cd42af
commit 6e54d1d164
2 changed files with 13 additions and 3 deletions
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14
sys/dev/e1000/if_igb.c
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@ -336,6 +336,12 @@ SYSCTL_INT(_hw_igb, OID_AUTO, rx_process_limit, CTLFLAG_RDTUN,
&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;
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 */
@ -453,11 +459,15 @@ 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
@ -3971,7 +3981,7 @@ igb_txeof(struct tx_ring *txr)
struct ifnet *ifp = adapter->ifp;
#endif /* DEV_NETMAP */
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;

2
sys/dev/e1000/if_igb.h
View File

@ -355,7 +355,6 @@ 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,
@ -534,6 +533,7 @@ 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 */