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Message-Id: <1446834911-29910-3-git-send-email-gregory.clement@free-electrons.com>
Date: Fri, 6 Nov 2015 19:35:11 +0100
From: Gregory CLEMENT <gregory.clement@...e-electrons.com>
To: "David S. Miller" <davem@...emloft.net>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc: Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
Gregory CLEMENT <gregory.clement@...e-electrons.com>,
Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
linux-arm-kernel@...ts.infradead.org,
Lior Amsalem <alior@...vell.com>,
Nadav Haklai <nadavh@...vell.com>,
Marcin Wojtas <mw@...ihalf.com>,
Simon Guinot <simon.guinot@...uanux.org>,
Maxime Ripard <maxime.ripard@...e-electrons.com>,
Boris BREZILLON <boris.brezillon@...e-electrons.com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Willy Tarreau <w@....eu>
Subject: [RFC PATCH 2/2] net: mvneta: Add naive RSS support
This patch add the support for the RSS related ethtool
function. Currently it only use one entry in the indirection table which
allows associating an mveneta interface to a given CPU.
Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
---
drivers/net/ethernet/marvell/mvneta.c | 114 ++++++++++++++++++++++++++++++++++
1 file changed, 114 insertions(+)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index c38326b848f9..5f810a458443 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -259,6 +259,11 @@
#define MVNETA_TX_MTU_MAX 0x3ffff
+/* The RSS lookup table actually has 256 entries but we do not use
+ * them yet
+ */
+#define MVNETA_RSS_LU_TABLE_SIZE 1
+
/* TSO header size */
#define TSO_HEADER_SIZE 128
@@ -380,6 +385,8 @@ struct mvneta_port {
int use_inband_status:1;
u64 ethtool_stats[ARRAY_SIZE(mvneta_statistics)];
+
+ u32 indir[MVNETA_RSS_LU_TABLE_SIZE];
};
/* The mvneta_tx_desc and mvneta_rx_desc structures describe the
@@ -3173,6 +3180,107 @@ static int mvneta_ethtool_get_sset_count(struct net_device *dev, int sset)
return -EOPNOTSUPP;
}
+static u32 mvneta_ethtool_get_rxfh_indir_size(struct net_device *dev)
+{
+ return MVNETA_RSS_LU_TABLE_SIZE;
+}
+
+static int mvneta_ethtool_get_rxnfc(struct net_device *dev,
+ struct ethtool_rxnfc *info,
+ u32 *rules __always_unused)
+{
+ switch (info->cmd) {
+ case ETHTOOL_GRXRINGS:
+ info->data = rxq_number;
+ return 0;
+ case ETHTOOL_GRXFH:
+ return -EOPNOTSUPP;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int mvneta_config_rss(struct mvneta_port *pp)
+{
+ int cpu;
+ u32 val;
+
+ netif_tx_stop_all_queues(pp->dev);
+
+ /* Mask all ethernet port interrupts */
+ mvreg_write(pp, MVNETA_INTR_NEW_MASK, 0);
+ mvreg_write(pp, MVNETA_INTR_OLD_MASK, 0);
+ mvreg_write(pp, MVNETA_INTR_MISC_MASK, 0);
+
+ /* We have to synchronise on the napi of each CPU */
+ for_each_online_cpu(cpu) {
+ struct mvneta_pcpu_port *pcpu_port =
+ per_cpu_ptr(pp->ports, cpu);
+
+ napi_synchronize(&pcpu_port->napi);
+ napi_disable(&pcpu_port->napi);
+ }
+
+ pp->rxq_def = pp->indir[0];
+
+ /* update unicast mapping */
+ mvneta_set_rx_mode(pp->dev);
+
+ /* Update val of portCfg register accordingly with all RxQueue types */
+ val = MVNETA_PORT_CONFIG_DEFL_VALUE(pp->rxq_def);
+ mvreg_write(pp, MVNETA_PORT_CONFIG, val);
+
+ /* Update the elected CPU matching the new rxq_def */
+ mvneta_percpu_elect(pp);
+
+ /* We have to synchronise on the napi of each CPU */
+ for_each_online_cpu(cpu) {
+ struct mvneta_pcpu_port *pcpu_port =
+ per_cpu_ptr(pp->ports, cpu);
+
+ napi_enable(&pcpu_port->napi);
+ }
+
+ netif_tx_start_all_queues(pp->dev);
+
+ return 0;
+}
+
+static int mvneta_ethtool_set_rxfh(struct net_device *dev, const u32 *indir,
+ const u8 *key, const u8 hfunc)
+{
+ struct mvneta_port *pp = netdev_priv(dev);
+ /* We require at least one supported parameter to be changed
+ * and no change in any of the unsupported parameters
+ */
+ if (key ||
+ (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP))
+ return -EOPNOTSUPP;
+
+ if (!indir)
+ return 0;
+
+ memcpy(pp->indir, indir, MVNETA_RSS_LU_TABLE_SIZE);
+
+ return mvneta_config_rss(pp);
+}
+
+static int mvneta_ethtool_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
+ u8 *hfunc)
+{
+ struct mvneta_port *pp = netdev_priv(dev);
+
+ if (hfunc)
+ *hfunc = ETH_RSS_HASH_TOP;
+
+ if (!indir)
+ return 0;
+
+ memcpy(indir, pp->indir, MVNETA_RSS_LU_TABLE_SIZE);
+
+ return 0;
+}
+
static const struct net_device_ops mvneta_netdev_ops = {
.ndo_open = mvneta_open,
.ndo_stop = mvneta_stop,
@@ -3197,6 +3305,10 @@ const struct ethtool_ops mvneta_eth_tool_ops = {
.get_strings = mvneta_ethtool_get_strings,
.get_ethtool_stats = mvneta_ethtool_get_stats,
.get_sset_count = mvneta_ethtool_get_sset_count,
+ .get_rxfh_indir_size = mvneta_ethtool_get_rxfh_indir_size,
+ .get_rxnfc = mvneta_ethtool_get_rxnfc,
+ .get_rxfh = mvneta_ethtool_get_rxfh,
+ .set_rxfh = mvneta_ethtool_set_rxfh,
};
/* Initialize hw */
@@ -3389,6 +3501,8 @@ static int mvneta_probe(struct platform_device *pdev)
pp->rxq_def = rxq_def;
+ pp->indir[0] = rxq_def;
+
pp->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pp->clk)) {
err = PTR_ERR(pp->clk);
--
2.5.0
--
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