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authorEli Cohen <eli@dev.mellanox.co.il>2008-04-16 21:09:33 -0700
committerRoland Dreier <rolandd@cisco.com>2008-04-16 21:09:33 -0700
commit28d52b3cd8d48ef0ff77d4a8a7a21fc2816bb0a5 (patch)
treeb1b7615491047d7b00bcaf193ba3a5c730655549 /drivers/infiniband
parent2dd5716227878d5950988514a2cbabf72f7fc888 (diff)
downloadop-kernel-dev-28d52b3cd8d48ef0ff77d4a8a7a21fc2816bb0a5.zip
op-kernel-dev-28d52b3cd8d48ef0ff77d4a8a7a21fc2816bb0a5.tar.gz
IPoIB: Support modifying IPoIB CQ event moderation
This can be used to tune at run time the parameters controlling the event (interrupt) generation rate and thus reduce the overhead incurred by handling interrupts resulting in better throughput. Since IPoIB uses a single CQ for both RX and TX, RX is chosen to dictate configuration for both RX and TX. Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib.h6
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_ethtool.c46
2 files changed, 52 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 3524d65..73b2b17 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -242,6 +242,11 @@ struct ipoib_cm_dev_priv {
int num_frags;
};
+struct ipoib_ethtool_st {
+ u16 coalesce_usecs;
+ u16 max_coalesced_frames;
+};
+
/*
* Device private locking: tx_lock protects members used in TX fast
* path (and we use LLTX so upper layers don't do extra locking).
@@ -320,6 +325,7 @@ struct ipoib_dev_priv {
struct dentry *path_dentry;
#endif
int hca_caps;
+ struct ipoib_ethtool_st ethtool;
};
struct ipoib_ah {
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c b/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
index d46e6b7..9a47428 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
@@ -42,9 +42,55 @@ static void ipoib_get_drvinfo(struct net_device *netdev,
strncpy(drvinfo->driver, "ipoib", sizeof(drvinfo->driver) - 1);
}
+static int ipoib_get_coalesce(struct net_device *dev,
+ struct ethtool_coalesce *coal)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+ coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
+ coal->tx_coalesce_usecs = priv->ethtool.coalesce_usecs;
+ coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
+ coal->tx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
+
+ return 0;
+}
+
+static int ipoib_set_coalesce(struct net_device *dev,
+ struct ethtool_coalesce *coal)
+{
+ struct ipoib_dev_priv *priv = netdev_priv(dev);
+ int ret;
+
+ /*
+ * Since IPoIB uses a single CQ for both rx and tx, we assume
+ * that rx params dictate the configuration. These values are
+ * saved in the private data and returned when ipoib_get_coalesce()
+ * is called.
+ */
+ if (coal->rx_coalesce_usecs > 0xffff ||
+ coal->rx_max_coalesced_frames > 0xffff)
+ return -EINVAL;
+
+ ret = ib_modify_cq(priv->cq, coal->rx_max_coalesced_frames,
+ coal->rx_coalesce_usecs);
+ if (ret && ret != -ENOSYS) {
+ ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
+ return ret;
+ }
+
+ coal->tx_coalesce_usecs = coal->rx_coalesce_usecs;
+ coal->tx_max_coalesced_frames = coal->rx_max_coalesced_frames;
+ priv->ethtool.coalesce_usecs = coal->rx_coalesce_usecs;
+ priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;
+
+ return 0;
+}
+
static const struct ethtool_ops ipoib_ethtool_ops = {
.get_drvinfo = ipoib_get_drvinfo,
.get_tso = ethtool_op_get_tso,
+ .get_coalesce = ipoib_get_coalesce,
+ .set_coalesce = ipoib_set_coalesce,
};
void ipoib_set_ethtool_ops(struct net_device *dev)
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