netdev - [v4 Patch 2/2] mlx4: add dynamic LRO disable support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 22 Jun 2010 04:50:17 -0400
From:	Amerigo Wang <amwang@...hat.com>
To:	netdev@...r.kernel.org
Cc:	nhorman@...hat.com, sgruszka@...hat.com, herbert.xu@...hat.com,
	Amerigo Wang <amwang@...hat.com>, bhutchings@...arflare.com,
	Ramkrishna.Vepa@...r.com, davem@...emloft.net
Subject: [v4 Patch 2/2] mlx4: add dynamic LRO disable support


This patch adds dynamic LRO diable support for mlx4 net driver.
It also fixes a bug of mlx4, which checks NETIF_F_LRO flag in rx
path without rtnl lock.

(I don't have mlx4 card, so only did compiling test. Anyone who wants
to test this is more than welcome.)

This is based on Neil's initial work too, and heavily modified based
on Stanislaw's suggestions.

Signed-off-by: WANG Cong <amwang@...hat.com>
Signed-off-by: Neil Horman <nhorman@...hat.com>
Acked-by: Neil Horman <nhorman@...hat.com>
Reviewed-by: Stanislaw Gruszka <sgruszka@...hat.com>
Cc: Ben Hutchings <bhutchings@...arflare.com>

---

diff --git a/drivers/net/mlx4/en_ethtool.c b/drivers/net/mlx4/en_ethtool.c
index d5afd03..b275238 100644
--- a/drivers/net/mlx4/en_ethtool.c
+++ b/drivers/net/mlx4/en_ethtool.c
@@ -387,6 +387,42 @@ static void mlx4_en_get_ringparam(struct net_device *dev,
 	param->tx_pending = mdev->profile.prof[priv->port].tx_ring_size;
 }
 
+static int mlx4_ethtool_op_set_flags(struct net_device *dev, u32 data)
+{
+	struct mlx4_en_priv *priv = netdev_priv(dev);
+	struct mlx4_en_dev *mdev = priv->mdev;
+	int rc = 0;
+	int changed = 0;
+
+	if (data & ~ETH_FLAG_LRO)
+		return -EOPNOTSUPP;
+
+	if (data & ETH_FLAG_LRO) {
+		if (mdev->profile.num_lro == 0)
+			return -EOPNOTSUPP;
+		if (!(dev->features & NETIF_F_LRO))
+			changed = 1;
+	} else if (dev->features & NETIF_F_LRO) {
+		changed = 1;
+	}
+
+	if (changed) {
+		if (netif_running(dev)) {
+			mutex_lock(&mdev->state_lock);
+			mlx4_en_stop_port(dev);
+		}
+		dev->features ^= NETIF_F_LRO;
+		if (netif_running(dev)) {
+			rc = mlx4_en_start_port(dev);
+			if (rc)
+				en_err(priv, "Failed to restart port\n");
+			mutex_unlock(&mdev->state_lock);
+		}
+	}
+
+	return rc;
+}
+
 const struct ethtool_ops mlx4_en_ethtool_ops = {
 	.get_drvinfo = mlx4_en_get_drvinfo,
 	.get_settings = mlx4_en_get_settings,
@@ -415,7 +451,7 @@ const struct ethtool_ops mlx4_en_ethtool_ops = {
 	.get_ringparam = mlx4_en_get_ringparam,
 	.set_ringparam = mlx4_en_set_ringparam,
 	.get_flags = ethtool_op_get_flags,
-	.set_flags = ethtool_op_set_flags,
+	.set_flags = mlx4_ethtool_op_set_flags,
 };
 
 
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html