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Add support for throttling transmit bandwidth. This is most commonly

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used to reduce packet loss on high delay (WAN) paths with a
slow link.
This commit is contained in:
Andrew Gallatin 2009-09-21 14:41:07 +00:00
parent 51a6ef34fb
commit 65c690668b
2 changed files with 60 additions and 2 deletions
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59
sys/dev/mxge/if_mxge.c
View File

@ -106,6 +106,7 @@ static int mxge_max_slices = 1;
static int mxge_rss_hash_type = MXGEFW_RSS_HASH_TYPE_SRC_PORT;
static int mxge_always_promisc = 0;
static int mxge_initial_mtu = ETHERMTU_JUMBO;
static int mxge_throttle = 0;
static char *mxge_fw_unaligned = "mxge_ethp_z8e";
static char *mxge_fw_aligned = "mxge_eth_z8e";
static char *mxge_fw_rss_aligned = "mxge_rss_eth_z8e";
@ -596,10 +597,13 @@ static int
mxge_select_firmware(mxge_softc_t *sc)
{
int aligned = 0;
int force_firmware = mxge_force_firmware;
if (sc->throttle)
force_firmware = sc->throttle;
if (mxge_force_firmware != 0) {
if (mxge_force_firmware == 1)
if (force_firmware != 0) {
if (force_firmware == 1)
aligned = 1;
else
aligned = 0;
@ -1314,9 +1318,47 @@ mxge_reset(mxge_softc_t *sc, int interrupts_setup)
mxge_change_promisc(sc, sc->ifp->if_flags & IFF_PROMISC);
mxge_change_pause(sc, sc->pause);
mxge_set_multicast_list(sc);
if (sc->throttle) {
cmd.data0 = sc->throttle;
if (mxge_send_cmd(sc, MXGEFW_CMD_SET_THROTTLE_FACTOR,
&cmd)) {
device_printf(sc->dev,
"can't enable throttle\n");
}
}
return status;
}
static int
mxge_change_throttle(SYSCTL_HANDLER_ARGS)
{
mxge_cmd_t cmd;
mxge_softc_t *sc;
int err;
unsigned int throttle;
sc = arg1;
throttle = sc->throttle;
err = sysctl_handle_int(oidp, &throttle, arg2, req);
if (err != 0) {
return err;
}
if (throttle == sc->throttle)
return 0;
if (throttle < MXGE_MIN_THROTTLE || throttle > MXGE_MAX_THROTTLE)
return EINVAL;
mtx_lock(&sc->driver_mtx);
cmd.data0 = throttle;
err = mxge_send_cmd(sc, MXGEFW_CMD_SET_THROTTLE_FACTOR, &cmd);
if (err == 0)
sc->throttle = throttle;
mtx_unlock(&sc->driver_mtx);
return err;
}
static int
mxge_change_intr_coal(SYSCTL_HANDLER_ARGS)
{
@ -1504,6 +1546,12 @@ mxge_add_sysctls(mxge_softc_t *sc)
0, mxge_change_intr_coal,
"I", "interrupt coalescing delay in usecs");
SYSCTL_ADD_PROC(ctx, children, OID_AUTO,
"throttle",
CTLTYPE_INT|CTLFLAG_RW, sc,
0, mxge_change_throttle,
"I", "transmit throttling");
SYSCTL_ADD_PROC(ctx, children, OID_AUTO,
"flow_control_enabled",
CTLTYPE_INT|CTLFLAG_RW, sc,
@ -4016,6 +4064,7 @@ mxge_fetch_tunables(mxge_softc_t *sc)
TUNABLE_INT_FETCH("hw.mxge.rss_hash_type", &mxge_rss_hash_type);
TUNABLE_INT_FETCH("hw.mxge.rss_hashtype", &mxge_rss_hash_type);
TUNABLE_INT_FETCH("hw.mxge.initial_mtu", &mxge_initial_mtu);
TUNABLE_INT_FETCH("hw.mxge.throttle", &mxge_throttle);
if (sc->lro_cnt != 0)
mxge_lro_cnt = sc->lro_cnt;
@ -4033,6 +4082,12 @@ mxge_fetch_tunables(mxge_softc_t *sc)
if (mxge_initial_mtu > ETHERMTU_JUMBO ||
mxge_initial_mtu < ETHER_MIN_LEN)
mxge_initial_mtu = ETHERMTU_JUMBO;
if (mxge_throttle && mxge_throttle > MXGE_MAX_THROTTLE)
mxge_throttle = MXGE_MAX_THROTTLE;
if (mxge_throttle && mxge_throttle < MXGE_MIN_THROTTLE)
mxge_throttle = MXGE_MIN_THROTTLE;
sc->throttle = mxge_throttle;
}

3
sys/dev/mxge/if_mxge_var.h
View File

@ -261,6 +261,7 @@ struct mxge_softc {
int fw_multicast_support;
int link_width;
int max_mtu;
int throttle;
int tx_defrag;
int media_flags;
int need_media_probe;
@ -286,6 +287,8 @@ struct mxge_softc {
#define MXGE_PCI_REV_Z8ES 1
#define MXGE_XFP_COMPLIANCE_BYTE 131
#define MXGE_SFP_COMPLIANCE_BYTE 3
#define MXGE_MIN_THROTTLE 416
#define MXGE_MAX_THROTTLE 4096
#define MXGE_HIGHPART_TO_U32(X) \
(sizeof (X) == 8) ? ((uint32_t)((uint64_t)(X) >> 32)) : (0)