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Date: Mon, 23 Nov 2020 20:17:15 +0000
From: Russell King - ARM Linux admin <linux@...linux.org.uk>
To: stefanc@...vell.com
Cc: netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
davem@...emloft.net, nadavh@...vell.com, ymarkman@...vell.com,
linux-kernel@...r.kernel.org, kuba@...nel.org, mw@...ihalf.com,
andrew@...n.ch
Subject: Re: [PATCH v2] net: mvpp2: divide fifo for dts-active ports only
On Mon, Nov 23, 2020 at 07:54:33PM +0200, stefanc@...vell.com wrote:
> From: Stefan Chulski <stefanc@...vell.com>
>
> Tx/Rx FIFO is a HW resource limited by total size, but shared
> by all ports of same CP110 and impacting port-performance.
> Do not divide the FIFO for ports which are not enabled in DTS,
> so active ports could have more FIFO.
> No change in FIFO allocation if all 3 ports on the communication
> processor enabled in DTS.
>
> The active port mapping should be done in probe before FIFO-init.
>
> Signed-off-by: Stefan Chulski <stefanc@...vell.com>
Thanks.
Reviewed-by: Russell King <rmk+kernel@...linux.org.uk>
One thing I didn't point out is that netdev would like patch submissions
to indicate which tree they are targetting. Are you intending this for
net or net-next?
[PATCH net vX] ...
or
[PATCH net-next vX] ...
in the subject line please.
> ---
> drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 23 +++--
> drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 129 +++++++++++++++++-------
> 2 files changed, 108 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> index 8347758..6bd7e40 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> @@ -695,6 +695,9 @@
> /* Maximum number of supported ports */
> #define MVPP2_MAX_PORTS 4
>
> +/* Loopback port index */
> +#define MVPP2_LOOPBACK_PORT_INDEX 3
> +
> /* Maximum number of TXQs used by single port */
> #define MVPP2_MAX_TXQ 8
>
> @@ -729,22 +732,21 @@
> #define MVPP2_TX_DESC_ALIGN (MVPP2_DESC_ALIGNED_SIZE - 1)
>
> /* RX FIFO constants */
> +#define MVPP2_RX_FIFO_PORT_DATA_SIZE_44KB 0xb000
> #define MVPP2_RX_FIFO_PORT_DATA_SIZE_32KB 0x8000
> #define MVPP2_RX_FIFO_PORT_DATA_SIZE_8KB 0x2000
> #define MVPP2_RX_FIFO_PORT_DATA_SIZE_4KB 0x1000
> -#define MVPP2_RX_FIFO_PORT_ATTR_SIZE_32KB 0x200
> -#define MVPP2_RX_FIFO_PORT_ATTR_SIZE_8KB 0x80
> +#define MVPP2_RX_FIFO_PORT_ATTR_SIZE(data_size) ((data_size) >> 6)
> #define MVPP2_RX_FIFO_PORT_ATTR_SIZE_4KB 0x40
> #define MVPP2_RX_FIFO_PORT_MIN_PKT 0x80
>
> /* TX FIFO constants */
> -#define MVPP22_TX_FIFO_DATA_SIZE_10KB 0xa
> -#define MVPP22_TX_FIFO_DATA_SIZE_3KB 0x3
> -#define MVPP2_TX_FIFO_THRESHOLD_MIN 256
> -#define MVPP2_TX_FIFO_THRESHOLD_10KB \
> - (MVPP22_TX_FIFO_DATA_SIZE_10KB * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)
> -#define MVPP2_TX_FIFO_THRESHOLD_3KB \
> - (MVPP22_TX_FIFO_DATA_SIZE_3KB * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)
> +#define MVPP22_TX_FIFO_DATA_SIZE_16KB 16
> +#define MVPP22_TX_FIFO_DATA_SIZE_10KB 10
> +#define MVPP22_TX_FIFO_DATA_SIZE_3KB 3
> +#define MVPP2_TX_FIFO_THRESHOLD_MIN 256 /* Bytes */
> +#define MVPP2_TX_FIFO_THRESHOLD(kb) \
> + ((kb) * 1024 - MVPP2_TX_FIFO_THRESHOLD_MIN)
>
> /* RX buffer constants */
> #define MVPP2_SKB_SHINFO_SIZE \
> @@ -946,6 +948,9 @@ struct mvpp2 {
> /* List of pointers to port structures */
> int port_count;
> struct mvpp2_port *port_list[MVPP2_MAX_PORTS];
> + /* Map of enabled ports */
> + unsigned long port_map;
> +
> struct mvpp2_tai *tai;
>
> /* Number of Tx threads used */
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index f6616c8..08c237a 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -6601,32 +6601,56 @@ static void mvpp2_rx_fifo_init(struct mvpp2 *priv)
> mvpp2_write(priv, MVPP2_RX_FIFO_INIT_REG, 0x1);
> }
>
> -static void mvpp22_rx_fifo_init(struct mvpp2 *priv)
> +static void mvpp22_rx_fifo_set_hw(struct mvpp2 *priv, int port, int data_size)
> {
> - int port;
> + int attr_size = MVPP2_RX_FIFO_PORT_ATTR_SIZE(data_size);
>
> - /* The FIFO size parameters are set depending on the maximum speed a
> - * given port can handle:
> - * - Port 0: 10Gbps
> - * - Port 1: 2.5Gbps
> - * - Ports 2 and 3: 1Gbps
> - */
> + mvpp2_write(priv, MVPP2_RX_DATA_FIFO_SIZE_REG(port), data_size);
> + mvpp2_write(priv, MVPP2_RX_ATTR_FIFO_SIZE_REG(port), attr_size);
> +}
>
> - mvpp2_write(priv, MVPP2_RX_DATA_FIFO_SIZE_REG(0),
> - MVPP2_RX_FIFO_PORT_DATA_SIZE_32KB);
> - mvpp2_write(priv, MVPP2_RX_ATTR_FIFO_SIZE_REG(0),
> - MVPP2_RX_FIFO_PORT_ATTR_SIZE_32KB);
> +/* Initialize TX FIFO's: the total FIFO size is 48kB on PPv2.2.
> + * 4kB fixed space must be assigned for the loopback port.
> + * Redistribute remaining avialable 44kB space among all active ports.
> + * Guarantee minimum 32kB for 10G port and 8kB for port 1, capable of 2.5G
> + * SGMII link.
> + */
> +static void mvpp22_rx_fifo_init(struct mvpp2 *priv)
> +{
> + int remaining_ports_count;
> + unsigned long port_map;
> + int size_remainder;
> + int port, size;
> +
> + /* The loopback requires fixed 4kB of the FIFO space assignment. */
> + mvpp22_rx_fifo_set_hw(priv, MVPP2_LOOPBACK_PORT_INDEX,
> + MVPP2_RX_FIFO_PORT_DATA_SIZE_4KB);
> + port_map = priv->port_map & ~BIT(MVPP2_LOOPBACK_PORT_INDEX);
> +
> + /* Set RX FIFO size to 0 for inactive ports. */
> + for_each_clear_bit(port, &port_map, MVPP2_LOOPBACK_PORT_INDEX)
> + mvpp22_rx_fifo_set_hw(priv, port, 0);
> +
> + /* Assign remaining RX FIFO space among all active ports. */
> + size_remainder = MVPP2_RX_FIFO_PORT_DATA_SIZE_44KB;
> + remaining_ports_count = hweight_long(port_map);
> +
> + for_each_set_bit(port, &port_map, MVPP2_LOOPBACK_PORT_INDEX) {
> + if (remaining_ports_count == 1)
> + size = size_remainder;
> + else if (port == 0)
> + size = max(size_remainder / remaining_ports_count,
> + MVPP2_RX_FIFO_PORT_DATA_SIZE_32KB);
> + else if (port == 1)
> + size = max(size_remainder / remaining_ports_count,
> + MVPP2_RX_FIFO_PORT_DATA_SIZE_8KB);
> + else
> + size = size_remainder / remaining_ports_count;
>
> - mvpp2_write(priv, MVPP2_RX_DATA_FIFO_SIZE_REG(1),
> - MVPP2_RX_FIFO_PORT_DATA_SIZE_8KB);
> - mvpp2_write(priv, MVPP2_RX_ATTR_FIFO_SIZE_REG(1),
> - MVPP2_RX_FIFO_PORT_ATTR_SIZE_8KB);
> + size_remainder -= size;
> + remaining_ports_count--;
>
> - for (port = 2; port < MVPP2_MAX_PORTS; port++) {
> - mvpp2_write(priv, MVPP2_RX_DATA_FIFO_SIZE_REG(port),
> - MVPP2_RX_FIFO_PORT_DATA_SIZE_4KB);
> - mvpp2_write(priv, MVPP2_RX_ATTR_FIFO_SIZE_REG(port),
> - MVPP2_RX_FIFO_PORT_ATTR_SIZE_4KB);
> + mvpp22_rx_fifo_set_hw(priv, port, size);
> }
>
> mvpp2_write(priv, MVPP2_RX_MIN_PKT_SIZE_REG,
> @@ -6634,24 +6658,53 @@ static void mvpp22_rx_fifo_init(struct mvpp2 *priv)
> mvpp2_write(priv, MVPP2_RX_FIFO_INIT_REG, 0x1);
> }
>
> -/* Initialize Tx FIFO's: the total FIFO size is 19kB on PPv2.2 and 10G
> - * interfaces must have a Tx FIFO size of 10kB. As only port 0 can do 10G,
> - * configure its Tx FIFO size to 10kB and the others ports Tx FIFO size to 3kB.
> +static void mvpp22_tx_fifo_set_hw(struct mvpp2 *priv, int port, int size)
> +{
> + int threshold = MVPP2_TX_FIFO_THRESHOLD(size);
> +
> + mvpp2_write(priv, MVPP22_TX_FIFO_SIZE_REG(port), size);
> + mvpp2_write(priv, MVPP22_TX_FIFO_THRESH_REG(port), threshold);
> +}
> +
> +/* Initialize TX FIFO's: the total FIFO size is 19kB on PPv2.2.
> + * 3kB fixed space must be assigned for the loopback port.
> + * Redistribute remaining avialable 16kB space among all active ports.
> + * The 10G interface should use 10kB (which is maximum possible size
> + * per single port).
> */
> static void mvpp22_tx_fifo_init(struct mvpp2 *priv)
> {
> - int port, size, thrs;
> -
> - for (port = 0; port < MVPP2_MAX_PORTS; port++) {
> - if (port == 0) {
> + int remaining_ports_count;
> + unsigned long port_map;
> + int size_remainder;
> + int port, size;
> +
> + /* The loopback requires fixed 3kB of the FIFO space assignment. */
> + mvpp22_tx_fifo_set_hw(priv, MVPP2_LOOPBACK_PORT_INDEX,
> + MVPP22_TX_FIFO_DATA_SIZE_3KB);
> + port_map = priv->port_map & ~BIT(MVPP2_LOOPBACK_PORT_INDEX);
> +
> + /* Set TX FIFO size to 0 for inactive ports. */
> + for_each_clear_bit(port, &port_map, MVPP2_LOOPBACK_PORT_INDEX)
> + mvpp22_tx_fifo_set_hw(priv, port, 0);
> +
> + /* Assign remaining TX FIFO space among all active ports. */
> + size_remainder = MVPP22_TX_FIFO_DATA_SIZE_16KB;
> + remaining_ports_count = hweight_long(port_map);
> +
> + for_each_set_bit(port, &port_map, MVPP2_LOOPBACK_PORT_INDEX) {
> + if (remaining_ports_count == 1)
> + size = min(size_remainder,
> + MVPP22_TX_FIFO_DATA_SIZE_10KB);
> + else if (port == 0)
> size = MVPP22_TX_FIFO_DATA_SIZE_10KB;
> - thrs = MVPP2_TX_FIFO_THRESHOLD_10KB;
> - } else {
> - size = MVPP22_TX_FIFO_DATA_SIZE_3KB;
> - thrs = MVPP2_TX_FIFO_THRESHOLD_3KB;
> - }
> - mvpp2_write(priv, MVPP22_TX_FIFO_SIZE_REG(port), size);
> - mvpp2_write(priv, MVPP22_TX_FIFO_THRESH_REG(port), thrs);
> + else
> + size = size_remainder / remaining_ports_count;
> +
> + size_remainder -= size;
> + remaining_ports_count--;
> +
> + mvpp22_tx_fifo_set_hw(priv, port, size);
> }
> }
>
> @@ -6952,6 +7005,12 @@ static int mvpp2_probe(struct platform_device *pdev)
> goto err_axi_clk;
> }
>
> + /* Map DTS-active ports. Should be done before FIFO mvpp2_init */
> + fwnode_for_each_available_child_node(fwnode, port_fwnode) {
> + if (!fwnode_property_read_u32(port_fwnode, "port-id", &i))
> + priv->port_map |= BIT(i);
> + }
> +
> /* Initialize network controller */
> err = mvpp2_init(pdev, priv);
> if (err < 0) {
> --
> 1.9.1
>
>
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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