192 lines
5.0 KiB
Diff
192 lines
5.0 KiB
Diff
From: Gregory CLEMENT <gregory.clement@free-electrons.com>
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Date: Wed, 9 Dec 2015 18:23:50 +0100
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Subject: [PATCH] net: mvneta: Add naive RSS support
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This patch adds the support for the RSS related ethtool
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function. Currently it only uses one entry in the indirection table which
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allows associating an mvneta interface to a given CPU.
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Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
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Tested-by: Marcin Wojtas <mw@semihalf.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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--- a/drivers/net/ethernet/marvell/mvneta.c
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+++ b/drivers/net/ethernet/marvell/mvneta.c
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@@ -261,6 +261,11 @@
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#define MVNETA_TX_MTU_MAX 0x3ffff
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+/* The RSS lookup table actually has 256 entries but we do not use
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+ * them yet
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+ */
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+#define MVNETA_RSS_LU_TABLE_SIZE 1
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+
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/* TSO header size */
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#define TSO_HEADER_SIZE 128
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@@ -382,6 +387,8 @@ struct mvneta_port {
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unsigned int use_inband_status:1;
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u64 ethtool_stats[ARRAY_SIZE(mvneta_statistics)];
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+
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+ u32 indir[MVNETA_RSS_LU_TABLE_SIZE];
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};
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/* The mvneta_tx_desc and mvneta_rx_desc structures describe the
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@@ -1067,7 +1074,7 @@ static void mvneta_defaults_set(struct m
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if ((rxq % max_cpu) == cpu)
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rxq_map |= MVNETA_CPU_RXQ_ACCESS(rxq);
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- if (cpu == rxq_def)
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+ if (cpu == pp->rxq_def)
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txq_map = MVNETA_CPU_TXQ_ACCESS_ALL_MASK;
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mvreg_write(pp, MVNETA_CPU_MAP(cpu), rxq_map | txq_map);
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@@ -2508,6 +2515,18 @@ static void mvneta_percpu_unmask_interru
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MVNETA_MISCINTR_INTR_MASK);
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}
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+static void mvneta_percpu_mask_interrupt(void *arg)
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+{
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+ struct mvneta_port *pp = arg;
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+
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+ /* All the queue are masked, but actually only the ones
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+ * maped to this CPU will be masked
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+ */
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+ mvreg_write(pp, MVNETA_INTR_NEW_MASK, 0);
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+ mvreg_write(pp, MVNETA_INTR_OLD_MASK, 0);
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+ mvreg_write(pp, MVNETA_INTR_MISC_MASK, 0);
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+}
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+
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static void mvneta_start_dev(struct mvneta_port *pp)
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{
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unsigned int cpu;
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@@ -3231,6 +3250,106 @@ static int mvneta_ethtool_get_sset_count
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return -EOPNOTSUPP;
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}
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+static u32 mvneta_ethtool_get_rxfh_indir_size(struct net_device *dev)
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+{
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+ return MVNETA_RSS_LU_TABLE_SIZE;
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+}
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+
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+static int mvneta_ethtool_get_rxnfc(struct net_device *dev,
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+ struct ethtool_rxnfc *info,
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+ u32 *rules __always_unused)
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+{
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+ switch (info->cmd) {
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+ case ETHTOOL_GRXRINGS:
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+ info->data = rxq_number;
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+ return 0;
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+ case ETHTOOL_GRXFH:
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+ return -EOPNOTSUPP;
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+ default:
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+ return -EOPNOTSUPP;
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+ }
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+}
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+
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+static int mvneta_config_rss(struct mvneta_port *pp)
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+{
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+ int cpu;
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+ u32 val;
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+
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+ netif_tx_stop_all_queues(pp->dev);
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+
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+ for_each_online_cpu(cpu)
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+ smp_call_function_single(cpu, mvneta_percpu_mask_interrupt,
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+ pp, true);
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+
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+ /* We have to synchronise on the napi of each CPU */
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+ for_each_online_cpu(cpu) {
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+ struct mvneta_pcpu_port *pcpu_port =
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+ per_cpu_ptr(pp->ports, cpu);
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+
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+ napi_synchronize(&pcpu_port->napi);
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+ napi_disable(&pcpu_port->napi);
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+ }
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+
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+ pp->rxq_def = pp->indir[0];
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+
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+ /* Update unicast mapping */
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+ mvneta_set_rx_mode(pp->dev);
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+
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+ /* Update val of portCfg register accordingly with all RxQueue types */
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+ val = MVNETA_PORT_CONFIG_DEFL_VALUE(pp->rxq_def);
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+ mvreg_write(pp, MVNETA_PORT_CONFIG, val);
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+
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+ /* Update the elected CPU matching the new rxq_def */
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+ mvneta_percpu_elect(pp);
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+
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+ /* We have to synchronise on the napi of each CPU */
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+ for_each_online_cpu(cpu) {
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+ struct mvneta_pcpu_port *pcpu_port =
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+ per_cpu_ptr(pp->ports, cpu);
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+
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+ napi_enable(&pcpu_port->napi);
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+ }
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+
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+ netif_tx_start_all_queues(pp->dev);
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+
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+ return 0;
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+}
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+
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+static int mvneta_ethtool_set_rxfh(struct net_device *dev, const u32 *indir,
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+ const u8 *key, const u8 hfunc)
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+{
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+ struct mvneta_port *pp = netdev_priv(dev);
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+ /* We require at least one supported parameter to be changed
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+ * and no change in any of the unsupported parameters
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+ */
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+ if (key ||
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+ (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP))
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+ return -EOPNOTSUPP;
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+
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+ if (!indir)
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+ return 0;
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+
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+ memcpy(pp->indir, indir, MVNETA_RSS_LU_TABLE_SIZE);
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+
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+ return mvneta_config_rss(pp);
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+}
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+
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+static int mvneta_ethtool_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
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+ u8 *hfunc)
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+{
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+ struct mvneta_port *pp = netdev_priv(dev);
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+
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+ if (hfunc)
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+ *hfunc = ETH_RSS_HASH_TOP;
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+
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+ if (!indir)
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+ return 0;
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+
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+ memcpy(indir, pp->indir, MVNETA_RSS_LU_TABLE_SIZE);
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+
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+ return 0;
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+}
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+
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static const struct net_device_ops mvneta_netdev_ops = {
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.ndo_open = mvneta_open,
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.ndo_stop = mvneta_stop,
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@@ -3255,6 +3374,10 @@ const struct ethtool_ops mvneta_eth_tool
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.get_strings = mvneta_ethtool_get_strings,
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.get_ethtool_stats = mvneta_ethtool_get_stats,
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.get_sset_count = mvneta_ethtool_get_sset_count,
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+ .get_rxfh_indir_size = mvneta_ethtool_get_rxfh_indir_size,
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+ .get_rxnfc = mvneta_ethtool_get_rxnfc,
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+ .get_rxfh = mvneta_ethtool_get_rxfh,
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+ .set_rxfh = mvneta_ethtool_set_rxfh,
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};
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/* Initialize hw */
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@@ -3446,6 +3569,8 @@ static int mvneta_probe(struct platform_
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pp->rxq_def = rxq_def;
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+ pp->indir[0] = rxq_def;
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+
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pp->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(pp->clk)) {
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err = PTR_ERR(pp->clk);
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