diff mbox series

[net-next,3/8] net: ethernet: mtk_eth_soc: move MAX_DEVS in mtk_soc_data

Message ID ZIUWxQ9H7hNSd6rJ@makrotopia.org
State New
Headers show
Series [net-next,1/8] dt-bindings: net: mediatek,net: add mt7988-eth binding | expand

Commit Message

Daniel Golle June 11, 2023, 12:35 a.m. UTC 
From: Lorenzo Bianconi <lorenzo@kernel.org>

This is a preliminary patch to add MT7988 SoC support since it runs 3
macs instead of 2.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 34 +++++++++++++++++++--
 drivers/net/ethernet/mediatek/mtk_eth_soc.h | 11 +++----
 2 files changed, 36 insertions(+), 9 deletions(-)

Comments

Lorenzo Bianconi June 12, 2023, 9:52 p.m. UTC | #1 
> On Sun, Jun 11, 2023 at 01:35:17AM +0100, Daniel Golle wrote:
> > @@ -1106,14 +1105,14 @@ struct mtk_eth {
> >  	spinlock_t			tx_irq_lock;
> >  	spinlock_t			rx_irq_lock;
> >  	struct net_device		dummy_dev;
> > -	struct net_device		*netdev[MTK_MAX_DEVS];
> > -	struct mtk_mac			*mac[MTK_MAX_DEVS];
> > +	struct net_device		**netdev;
> > +	struct mtk_mac			**mac;
> >  	int				irq[3];
> >  	u32				msg_enable;
> >  	unsigned long			sysclk;
> >  	struct regmap			*ethsys;
> >  	struct regmap			*infra;
> > -	struct phylink_pcs		*sgmii_pcs[MTK_MAX_DEVS];
> > +	struct phylink_pcs		**sgmii_pcs;
> >  	struct regmap			*pctl;
> >  	bool				hwlro;
> >  	refcount_t			dma_refcnt;
> 
> Is it really worth the extra allocations?
> 
> There's three pointers here per device. Let's talk about modern systems,
> so that's 8 bytes each, and if MTK_MAX_DEVS was two, that's 48 bytes in
> all. If we expanded the array to allow three, that would be 72 bytes.
> 
> If we allocate separately, then we're allocating 16 or 24 bytes three
> times depending on whether we want two or three of them.
> 
> On arm64, I'm seeing the minimum slab size as 128 bytes, which means
> that's the minimum memory allocation. So, allocating three arrays will
> be 384 bytes in all, irrespective of whether we want two or three
> entries.
> 
> That's a waste of about 5x the memory over just expanding the arrays!

ack, I agree. I will fix it.

Regards,
Lorenzo

> 
> If you want to go down the route of dynamically allocating these, it
> would make better sense to combine them into a single structure that
> itself is an array, and thus requiring only one allocation. That
> reduces the wastage to about 56 bytes for three ports or 80 bytes
> for two.
> 
> Thanks.
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 7014e0d108b27..f91b661379a94 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -4030,7 +4030,10 @@  static void mtk_sgmii_destroy(struct mtk_eth *eth)
 {
 	int i;
 
-	for (i = 0; i < MTK_MAX_DEVS; i++)
+	if (!eth->sgmii_pcs)
+		return;
+
+	for (i = 0; i < eth->soc->num_devs; i++)
 		mtk_pcs_lynxi_destroy(eth->sgmii_pcs[i]);
 }
 
@@ -4489,7 +4492,12 @@  static int mtk_sgmii_init(struct mtk_eth *eth)
 	u32 flags;
 	int i;
 
-	for (i = 0; i < MTK_MAX_DEVS; i++) {
+	eth->sgmii_pcs = devm_kzalloc(eth->dev,
+				      sizeof(*eth->sgmii_pcs) *
+				      eth->soc->num_devs,
+				      GFP_KERNEL);
+
+	for (i = 0; i < eth->soc->num_devs; i++) {
 		np = of_parse_phandle(eth->dev->of_node, "mediatek,sgmiisys", i);
 		if (!np)
 			break;
@@ -4534,6 +4542,18 @@  static int mtk_probe(struct platform_device *pdev)
 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
 		eth->ip_align = NET_IP_ALIGN;
 
+	eth->netdev = devm_kzalloc(eth->dev,
+				   sizeof(*eth->netdev) * eth->soc->num_devs,
+				   GFP_KERNEL);
+	if (!eth->netdev)
+		return -ENOMEM;
+
+	eth->mac = devm_kzalloc(eth->dev,
+				sizeof(*eth->mac) * eth->soc->num_devs,
+				GFP_KERNEL);
+	if (!eth->mac)
+		return -ENOMEM;
+
 	spin_lock_init(&eth->page_lock);
 	spin_lock_init(&eth->tx_irq_lock);
 	spin_lock_init(&eth->rx_irq_lock);
@@ -4719,7 +4739,7 @@  static int mtk_probe(struct platform_device *pdev)
 			goto err_deinit_ppe;
 	}
 
-	for (i = 0; i < MTK_MAX_DEVS; i++) {
+	for (i = 0; i < eth->soc->num_devs; i++) {
 		if (!eth->netdev[i])
 			continue;
 
@@ -4793,6 +4813,7 @@  static const struct mtk_soc_data mt2701_data = {
 	.hw_features = MTK_HW_FEATURES,
 	.required_clks = MT7623_CLKS_BITMAP,
 	.required_pctl = true,
+	.num_devs = 2,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma),
 		.rxd_size = sizeof(struct mtk_rx_dma),
@@ -4811,6 +4832,7 @@  static const struct mtk_soc_data mt7621_data = {
 	.required_pctl = false,
 	.offload_version = 1,
 	.hash_offset = 2,
+	.num_devs = 2,
 	.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma),
@@ -4832,6 +4854,7 @@  static const struct mtk_soc_data mt7622_data = {
 	.offload_version = 2,
 	.hash_offset = 2,
 	.has_accounting = true,
+	.num_devs = 2,
 	.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma),
@@ -4851,6 +4874,7 @@  static const struct mtk_soc_data mt7623_data = {
 	.required_pctl = true,
 	.offload_version = 1,
 	.hash_offset = 2,
+	.num_devs = 2,
 	.foe_entry_size = sizeof(struct mtk_foe_entry) - 16,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma),
@@ -4870,6 +4894,7 @@  static const struct mtk_soc_data mt7629_data = {
 	.required_clks = MT7629_CLKS_BITMAP,
 	.required_pctl = false,
 	.has_accounting = true,
+	.num_devs = 2,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma),
 		.rxd_size = sizeof(struct mtk_rx_dma),
@@ -4891,6 +4916,7 @@  static const struct mtk_soc_data mt7981_data = {
 	.hash_offset = 4,
 	.foe_entry_size = sizeof(struct mtk_foe_entry),
 	.has_accounting = true,
+	.num_devs = 2,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma_v2),
 		.rxd_size = sizeof(struct mtk_rx_dma_v2),
@@ -4910,6 +4936,7 @@  static const struct mtk_soc_data mt7986_data = {
 	.required_pctl = false,
 	.offload_version = 2,
 	.hash_offset = 4,
+	.num_devs = 2,
 	.foe_entry_size = sizeof(struct mtk_foe_entry),
 	.has_accounting = true,
 	.txrx = {
@@ -4928,6 +4955,7 @@  static const struct mtk_soc_data rt5350_data = {
 	.hw_features = MTK_HW_FEATURES_MT7628,
 	.required_clks = MT7628_CLKS_BITMAP,
 	.required_pctl = false,
+	.num_devs = 2,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma),
 		.rxd_size = sizeof(struct mtk_rx_dma),
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index c74c3918113a5..62981e00be7e7 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -1016,6 +1016,7 @@  struct mtk_reg_map {
  * @required_pctl		A bool value to show whether the SoC requires
  *				the extra setup for those pins used by GMAC.
  * @hash_offset			Flow table hash offset.
+ * @num_devs			SoC number of macs.
  * @foe_entry_size		Foe table entry size.
  * @has_accounting		Bool indicating support for accounting of
  *				offloaded flows.
@@ -1034,6 +1035,7 @@  struct mtk_soc_data {
 	bool		required_pctl;
 	u8		offload_version;
 	u8		hash_offset;
+	u8		num_devs;
 	u16		foe_entry_size;
 	netdev_features_t hw_features;
 	bool		has_accounting;
@@ -1049,9 +1051,6 @@  struct mtk_soc_data {
 
 #define MTK_DMA_MONITOR_TIMEOUT		msecs_to_jiffies(1000)
 
-/* currently no SoC has more than 2 macs */
-#define MTK_MAX_DEVS			2
-
 /* struct mtk_eth -	This is the main datasructure for holding the state
  *			of the driver
  * @dev:		The device pointer
@@ -1106,14 +1105,14 @@  struct mtk_eth {
 	spinlock_t			tx_irq_lock;
 	spinlock_t			rx_irq_lock;
 	struct net_device		dummy_dev;
-	struct net_device		*netdev[MTK_MAX_DEVS];
-	struct mtk_mac			*mac[MTK_MAX_DEVS];
+	struct net_device		**netdev;
+	struct mtk_mac			**mac;
 	int				irq[3];
 	u32				msg_enable;
 	unsigned long			sysclk;
 	struct regmap			*ethsys;
 	struct regmap			*infra;
-	struct phylink_pcs		*sgmii_pcs[MTK_MAX_DEVS];
+	struct phylink_pcs		**sgmii_pcs;
 	struct regmap			*pctl;
 	bool				hwlro;
 	refcount_t			dma_refcnt;