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authorgallatin <gallatin@FreeBSD.org>2009-09-21 14:41:07 +0000
committergallatin <gallatin@FreeBSD.org>2009-09-21 14:41:07 +0000
commitf5d9e7af24017bb858f096dcbbd5cfb62f33084a (patch)
treed3e684ae449e5cbcb005eae20f080bd2c26a670b /sys/dev/mxge
parent9357da94fee4e334b38d924cc674c27bc14b3bc5 (diff)
downloadFreeBSD-src-f5d9e7af24017bb858f096dcbbd5cfb62f33084a.zip
FreeBSD-src-f5d9e7af24017bb858f096dcbbd5cfb62f33084a.tar.gz
Add support for throttling transmit bandwidth. This is most commonly
used to reduce packet loss on high delay (WAN) paths with a slow link.
Diffstat (limited to 'sys/dev/mxge')
-rw-r--r--sys/dev/mxge/if_mxge.c59
-rw-r--r--sys/dev/mxge/if_mxge_var.h3
2 files changed, 60 insertions, 2 deletions
diff --git a/sys/dev/mxge/if_mxge.c b/sys/dev/mxge/if_mxge.c
index 88c3489..8fdc440 100644
--- a/sys/dev/mxge/if_mxge.c
+++ b/sys/dev/mxge/if_mxge.c
@@ -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;
@@ -1314,10 +1318,48 @@ 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)
{
mxge_softc_t *sc;
@@ -1505,6 +1547,12 @@ mxge_add_sysctls(mxge_softc_t *sc)
"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,
0, mxge_change_flow_control,
@@ -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;
}
diff --git a/sys/dev/mxge/if_mxge_var.h b/sys/dev/mxge/if_mxge_var.h
index 47c39b5..b25adb4 100644
--- a/sys/dev/mxge/if_mxge_var.h
+++ b/sys/dev/mxge/if_mxge_var.h
@@ -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)
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