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Date: Thu, 16 Mar 2017 10:12:57 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Joao Pinto <Joao.Pinto@...opsys.com>, davem@...emloft.net
Cc: peppe.cavallaro@...com, alexandre.torgue@...com,
netdev@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] net: stmmac: RX queue routing configuration
On 03/16/2017 03:56 AM, Joao Pinto wrote:
> This patch adds the configuration of RX queues' routing.
>
> Signed-off-by: Joao Pinto <jpinto@...opsys.com>
> ---
> Documentation/devicetree/bindings/net/stmmac.txt | 19 ++++++-
> drivers/net/ethernet/stmicro/stmmac/common.h | 9 ++++
> drivers/net/ethernet/stmicro/stmmac/dwmac4.h | 18 +++++++
> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 63 ++++++++++++++++++++++
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 25 +++++++++
> drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 8 +++
> .../net/ethernet/stmicro/stmmac/stmmac_platform.c | 49 +++++++++++++++++
> include/linux/stmmac.h | 12 +++++
> 8 files changed, 202 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index b9a9ae9..9c9e774 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -84,6 +84,16 @@ Optional properties:
> - snps,avb-algorithm: Queue to be enabled as AVB
> - snps,map-to-dma-channel: Channel to map
> - snps,priority: RX queue priority
> + - Specifiy RX Queue for processing certain types of packets:
> + - snps,avcp-to-queue: AV Untagged Control packets
> + - snps,ptp-to-queue: PTP Packets
> + - snps,dcbcp-to-queue: DCB Control Packets
> + - snps,up-to-queue: Untagged Packets
> + - snps,multi-broad-cast-queue: Multicast & Broadcast Packets
> + - snps,tpqc-queue: Tagged PTPoE Packets Queuing Control. Values:
> + 0x0 - Priority based (RX queues non-AV)
> + 0x1 - Routes to queue indicated in "snps,ptp-to-queue"
> + 0x2 - Priority based (RX queues AV enabled)
> - Multiple TX Queues parameters: below the list of all the parameters to
> configure the multiple TX queues:
> - snps,tx-queues-to-use: number of TX queues to be used in the driver
You are allowing a policy to be defined with Device Tree here which is
usually frowned upon. Can you look into existing facilities offered by
tc offloads, e.g: mqprio etc. to allow users to dynamically configure
the queue mappings at runtime?
> @@ -112,8 +122,15 @@ Examples:
> };
>
> mtl_rx_setup: rx-queues-config {
> - snps,rx-queues-to-use = <1>;
> + snps,rx-queues-to-use = <0>;
> snps,rx-sched-sp;
> + snps,avcp-to-queue = <0>;
> + snps,ptp-to-queue = <0>;
> + snps,dcbcp-to-queue = <0>;
> + snps,up-to-queue = <0>;
> + snps,multi-broad-cast-queue = <0>;
> + snps,tpqc-queue = <0>;
> +
> queue0 {
> snps,dcb-algorithm;
> snps,map-to-dma-channel = <0x0>;
> diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
> index e0b31e7..e08c4c4 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/common.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/common.h
> @@ -473,6 +473,15 @@ struct stmmac_ops {
> void (*rx_queue_prio)(struct mac_device_info *hw, u32 prio, u32 queue);
> /* TX Queues Priority */
> void (*tx_queue_prio)(struct mac_device_info *hw, u32 prio, u32 queue);
> + /* RX Queues Routing */
> + void (*rx_queue_routing)(struct mac_device_info *hw,
> + bool route_avcp_enable, u8 route_avcp_queue,
> + bool route_ptp_enable, u8 route_ptp_queue,
> + bool route_dcbcp_enable, u8 route_dcbcp_queue,
> + bool route_up_enable, u8 route_up_queue,
> + bool route_multi_broad_enable,
> + u8 route_multi_broad_queue,
> + bool route_tpqc_enable, u8 route_tpqc_queue);
> /* Program RX Algorithms */
> void (*prog_mtl_rx_algorithms)(struct mac_device_info *hw, u32 rx_alg);
> /* Program TX Algorithms */
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> index a6c382d..93cc3f6 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
> @@ -44,6 +44,24 @@
> #define GMAC_ADDR_HIGH(reg) (0x300 + reg * 8)
> #define GMAC_ADDR_LOW(reg) (0x304 + reg * 8)
>
> +/* RX Queues Routing */
> +#define GMAC_RXQCTRL_AVCPQ_MASK GENMASK(2, 0)
> +#define GMAC_RXQCTRL_AVCPQ_SHIFT 0
> +#define GMAC_RXQCTRL_PTPQ_MASK GENMASK(6, 4)
> +#define GMAC_RXQCTRL_PTPQ_SHIFT 4
> +#define GMAC_RXQCTRL_DCBCPQ_MASK GENMASK(10, 8)
> +#define GMAC_RXQCTRL_DCBCPQ_SHIFT 8
> +#define GMAC_RXQCTRL_UPQ_MASK GENMASK(14, 12)
> +#define GMAC_RXQCTRL_UPQ_SHIFT 12
> +#define GMAC_RXQCTRL_MCBCQ_MASK GENMASK(18, 16)
> +#define GMAC_RXQCTRL_MCBCQ_SHIFT 16
> +#define GMAC_RXQCTRL_MCBCQEN BIT(20)
> +#define GMAC_RXQCTRL_MCBCQEN_SHIFT 20
> +#define GMAC_RXQCTRL_TACPQE BIT(21)
> +#define GMAC_RXQCTRL_TACPQE_SHIFT 21
> +#define GMAC_RXQCTRL_TPQC_MASK GENMASK(24, 22)
> +#define GMAC_RXQCTRL_TPQC_SHIFT 22
> +
> /* MAC Packet Filtering */
> #define GMAC_PACKET_FILTER_PR BIT(0)
> #define GMAC_PACKET_FILTER_HMC BIT(2)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> index 342f62a..8fc1f56 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
> @@ -109,6 +109,68 @@ static void dwmac4_tx_queue_priority(struct mac_device_info *hw,
> writel(value, ioaddr + base_register);
> }
>
> +static void dwmac4_tx_queue_routing(struct mac_device_info *hw,
> + bool route_avcp_enable,
> + u8 route_avcp_queue,
> + bool route_ptp_enable,
> + u8 route_ptp_queue,
> + bool route_dcbcp_enable,
> + u8 route_dcbcp_queue,
> + bool route_up_enable,
> + u8 route_up_queue,
> + bool route_multi_broad_enable,
> + u8 route_multi_broad_queue,
> + bool route_tpqc_enable,
> + u8 route_tpqc_queue)
> +{
This is not looking good at all 13 parameters passed here... thankfully
this is not called in a hot path.
So here is what I would suggest:
- put the bool, u8, and masks, shifts, offsets parameters in a
structure, define an array of structures holding these variables in your
driver's private context, index them with an enumeration for each queue
- pass a reference to this structure here, and iterate over the array of
structures and do the programming based on what this structure contains
for MASK, SHIFT, base register etc...
> + void __iomem *ioaddr = hw->pcsr;
> + u32 value;
> +
> + value = readl(ioaddr + GMAC_RXQ_CTRL1);
> +
> static int quark_default_data(struct plat_stmmacenet_data *plat,
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 77b0468..5e82379 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -165,6 +165,55 @@ static void stmmac_mtl_setup(struct platform_device *pdev,
> else
> plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
>
> + /* RX routing configuration */
> + if (of_property_read_u8(rx_node, "snps,avcp-to-queue",
> + &plat->route_avcp_queue)) {
> + plat->route_avcp_queue = 0;
> + plat->route_avcp_enable = false;
> + } else {
> + plat->route_avcp_enable = true;
> + }
This is very redundant too, see the suggestion above, define an array of
property names and look them up in a loop using the queue enumeration.
> +
> + if (of_property_read_u8(rx_node, "snps,ptp-to-queue",
> + &plat->route_ptp_queue)) {
> + plat->route_ptp_queue = 0;
> + plat->route_ptp_enable = false;
> + } else {
> + plat->route_ptp_enable = true;
> + }
> +
> + if (of_property_read_u8(rx_node, "snps,dcbcp-to-queue",
> + &plat->route_dcbcp_queue)) {
> + plat->route_dcbcp_queue = 0;
> + plat->route_dcbcp_enable = false;
> + } else {
> + plat->route_dcbcp_enable = true;
> + }
> +
> + if (of_property_read_u8(rx_node, "snps,up-to-queue",
> + &plat->route_up_queue)) {
> + plat->route_up_queue = 0;
> + plat->route_up_enable = false;
> + } else {
> + plat->route_up_enable = true;
> + }
> +
> + if (of_property_read_u8(rx_node, "snps,multi-broad-cast-queue",
> + &plat->route_multi_broad_queue)) {
> + plat->route_multi_broad_queue = 0;
> + plat->route_multi_broad_enable = false;
> + } else {
> + plat->route_multi_broad_enable = true;
> + }
> +
> + if (of_property_read_u8(rx_node, "snps,tpqc-queue",
> + &plat->route_tpqc_queue)) {
> + plat->route_tpqc_queue = 0;
> + plat->route_tpqc_enable = false;
> + } else {
> + plat->route_tpqc_enable = true;
> + }
> +
> /* Processing individual RX queue config */
> for_each_child_of_node(rx_node, q_node) {
> if (queue >= plat->rx_queues_to_use)
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index b7d5e7a..8f5ebf5 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -171,6 +171,18 @@ struct plat_stmmacenet_data {
> u8 tx_queues_to_use;
> u8 rx_sched_algorithm;
> u8 tx_sched_algorithm;
> + bool route_avcp_enable;
> + u8 route_avcp_queue;
> + bool route_ptp_enable;
> + u8 route_ptp_queue;
> + bool route_dcbcp_enable;
> + u8 route_dcbcp_queue;
> + bool route_up_enable;
> + u8 route_up_queue;
> + bool route_multi_broad_enable;
> + u8 route_multi_broad_queue;
> + bool route_tpqc_enable;
> + u8 route_tpqc_queue;
Same here, this absolutely does not scale.
> struct stmmac_rxq_cfg rx_queues_cfg[MTL_MAX_RX_QUEUES];
> struct stmmac_txq_cfg tx_queues_cfg[MTL_MAX_TX_QUEUES];
> void (*fix_mac_speed)(void *priv, unsigned int speed);
>
--
Florian
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