[v5,net-next,3/4] net: ethernet: ti: am65-cpsw-qos: Add Frame Preemption MAC Merge support
Commit Message
Add driver support for viewing / changing the MAC Merge sublayer
parameters and seeing the verification state machine's current state
via ethtool.
As hardware does not support interrupt notification for verification
events we resort to polling on link up. On link up we try a couple of
times for verification success and if unsuccessful then give up.
The Frame Preemption feature is described in the Technical Reference
Manual [1] in section:
12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
[1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
[2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
Signed-off-by: Roger Quadros <rogerq@kernel.org>
---
drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 150 ++++++++++++
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +
drivers/net/ethernet/ti/am65-cpsw-nuss.h | 5 +
drivers/net/ethernet/ti/am65-cpsw-qos.c | 240 ++++++++++++++++----
drivers/net/ethernet/ti/am65-cpsw-qos.h | 104 +++++++++
5 files changed, 454 insertions(+), 47 deletions(-)
Changelog:
v5:
- No change
v4:
- Rebase and include in the same series as mqprio support.
v3:
- Rebase on top of v6.6-rc1 and mqprio support [1]
- Support ethtool_ops :: get_mm_stats()
- drop unused variables cmn_ctrl and verify_cnt
- make am65_cpsw_iet_link_state_update() and
am65_cpsw_iet_change_preemptible_tcs() static
[1] https://lore.kernel.org/all/20230918075358.5878-1-rogerq@kernel.org/
v2:
- Use proper control bits for PMAC enable (AM65_CPSW_PN_CTL_IET_PORT_EN)
and TX enable (AM65_CPSW_PN_IET_MAC_PENABLE)
- Common IET Enable (AM65_CPSW_CTL_IET_EN) is set if any port has
AM65_CPSW_PN_CTL_IET_PORT_EN set.
- Fix workaround for erratum i2208. i.e. Limit rx_min_frag_size to 124
- Fix am65_cpsw_iet_get_verify_timeout_ms() to default to timeout for
1G link if link is inactive.
- resize the RX FIFO based on pmac_enabled, not tx_enabled.
Test Procedure:
- 2 EVMs with AM65-CPSW network port connected to each other
- Run iet-setup-mqprio.sh on both
#!/bin/sh
#iet-setup-mqprio.sh
ifconfig eth0 down
ifconfig eth1 down
ethtool -L eth0 tx 4
ethtool --set-mm eth0 pmac-enabled on tx-enabled on verify-enabled on verify-time 10 tx-min-frag-size 124
ifconfig eth0 up
sleep 10
tc qdisc add dev eth0 handle 100: root mqprio \
num_tc 4 \
map 0 1 2 3 \
queues 1@0 1@1 1@2 1@3 \
hw 1 \
mode dcb \
fp P P P E
tc -g class show dev eth0
tc qdisc add dev eth0 clsact
tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5002 0xffff action skbedit priority 2
tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5003 0xffff action skbedit priority 3
ip addr add 192.168.3.102/24 dev eth0
- check that MAC merge verification has succeeded
ethtool --show-mm eth0
MAC Merge layer state for eth0:
pMAC enabled: on
TX enabled: on
TX active: on
TX minimum fragment size: 124
RX minimum fragment size: 124
Verify enabled: on
Verify time: 10
Max verify time: 134
Verification status: SUCCEEDED
- On receiver EVM run 2 iperf instances
iperf3 -s -i30 -p5002&
iperf3 -s -i30 -p5003&
- On sender EVM run 2 iperf instances
iperf3 -c 192.168.3.102 -u -b200M -l1472 -u -t5 -i30 -p5002&
iperf3 -c 192.168.3.102 -u -b50M -l1472 -u -t5 -i30 -p5003&
- Check IET stats on sender. Look for MACMergeFragCountTx: increments
ethtool -I --show-mm eth0
MAC Merge layer state for eth0:
pMAC enabled: on
TX enabled: on
TX active: on
TX minimum fragment size: 124
RX minimum fragment size: 124
Verify enabled: on
Verify time: 10
Max verify time: 134
Verification status: SUCCEEDED
Statistics:
MACMergeFrameAssErrorCount: 0
MACMergeFrameSmdErrorCount: 0
MACMergeFrameAssOkCount: 0
MACMergeFragCountRx: 0
MACMergeFragCountTx: 57824
MACMergeHoldCount: 0
- Check IET stats on receiver. Look for MACMergeFragCountRx: and
MACMergeFrameAssOkCount:
ethtool -I --show-mm eth0
MAC Merge layer state for eth0:
pMAC enabled: on
TX enabled: on
TX active: on
TX minimum fragment size: 124
RX minimum fragment size: 124
Verify enabled: on
Verify time: 10
Max verify time: 134
Verification status: SUCCEEDED
Statistics:
MACMergeFrameAssErrorCount: 0
MACMergeFrameSmdErrorCount: 0
MACMergeFrameAssOkCount: 57018
MACMergeFragCountRx: 57824
MACMergeFragCountTx: 0
MACMergeHoldCount: 0
Comments
On Wed, 2023-09-27 at 10:27 +0300, Roger Quadros wrote:
> Add driver support for viewing / changing the MAC Merge sublayer
> parameters and seeing the verification state machine's current state
> via ethtool.
>
> As hardware does not support interrupt notification for verification
> events we resort to polling on link up. On link up we try a couple of
> times for verification success and if unsuccessful then give up.
>
> The Frame Preemption feature is described in the Technical Reference
> Manual [1] in section:
> 12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
>
> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
>
> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
>
> Signed-off-by: Roger Quadros <rogerq@kernel.org>
> ---
> drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 150 ++++++++++++
> drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +
> drivers/net/ethernet/ti/am65-cpsw-nuss.h | 5 +
> drivers/net/ethernet/ti/am65-cpsw-qos.c | 240 ++++++++++++++++----
> drivers/net/ethernet/ti/am65-cpsw-qos.h | 104 +++++++++
> 5 files changed, 454 insertions(+), 47 deletions(-)
>
> Changelog:
> v5:
> - No change
>
> v4:
> - Rebase and include in the same series as mqprio support.
>
> v3:
> - Rebase on top of v6.6-rc1 and mqprio support [1]
> - Support ethtool_ops :: get_mm_stats()
> - drop unused variables cmn_ctrl and verify_cnt
> - make am65_cpsw_iet_link_state_update() and
> am65_cpsw_iet_change_preemptible_tcs() static
>
> [1] https://lore.kernel.org/all/20230918075358.5878-1-rogerq@kernel.org/
>
> v2:
> - Use proper control bits for PMAC enable (AM65_CPSW_PN_CTL_IET_PORT_EN)
> and TX enable (AM65_CPSW_PN_IET_MAC_PENABLE)
> - Common IET Enable (AM65_CPSW_CTL_IET_EN) is set if any port has
> AM65_CPSW_PN_CTL_IET_PORT_EN set.
> - Fix workaround for erratum i2208. i.e. Limit rx_min_frag_size to 124
> - Fix am65_cpsw_iet_get_verify_timeout_ms() to default to timeout for
> 1G link if link is inactive.
> - resize the RX FIFO based on pmac_enabled, not tx_enabled.
>
> Test Procedure:
>
> - 2 EVMs with AM65-CPSW network port connected to each other
> - Run iet-setup-mqprio.sh on both
>
> #!/bin/sh
> #iet-setup-mqprio.sh
>
> ifconfig eth0 down
> ifconfig eth1 down
> ethtool -L eth0 tx 4
> ethtool --set-mm eth0 pmac-enabled on tx-enabled on verify-enabled on verify-time 10 tx-min-frag-size 124
> ifconfig eth0 up
> sleep 10
>
> tc qdisc add dev eth0 handle 100: root mqprio \
> num_tc 4 \
> map 0 1 2 3 \
> queues 1@0 1@1 1@2 1@3 \
> hw 1 \
> mode dcb \
> fp P P P E
>
> tc -g class show dev eth0
> tc qdisc add dev eth0 clsact
> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5002 0xffff action skbedit priority 2
> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5003 0xffff action skbedit priority 3
> ip addr add 192.168.3.102/24 dev eth0
>
> - check that MAC merge verification has succeeded
>
> ethtool --show-mm eth0
>
> MAC Merge layer state for eth0:
> pMAC enabled: on
> TX enabled: on
> TX active: on
> TX minimum fragment size: 124
> RX minimum fragment size: 124
> Verify enabled: on
> Verify time: 10
> Max verify time: 134
> Verification status: SUCCEEDED
>
> - On receiver EVM run 2 iperf instances
>
> iperf3 -s -i30 -p5002&
> iperf3 -s -i30 -p5003&
>
> - On sender EVM run 2 iperf instances
>
> iperf3 -c 192.168.3.102 -u -b200M -l1472 -u -t5 -i30 -p5002&
> iperf3 -c 192.168.3.102 -u -b50M -l1472 -u -t5 -i30 -p5003&
>
> - Check IET stats on sender. Look for MACMergeFragCountTx: increments
>
> ethtool -I --show-mm eth0
> MAC Merge layer state for eth0:
> pMAC enabled: on
> TX enabled: on
> TX active: on
> TX minimum fragment size: 124
> RX minimum fragment size: 124
> Verify enabled: on
> Verify time: 10
> Max verify time: 134
> Verification status: SUCCEEDED
> Statistics:
> MACMergeFrameAssErrorCount: 0
> MACMergeFrameSmdErrorCount: 0
> MACMergeFrameAssOkCount: 0
> MACMergeFragCountRx: 0
> MACMergeFragCountTx: 57824
> MACMergeHoldCount: 0
>
> - Check IET stats on receiver. Look for MACMergeFragCountRx: and
> MACMergeFrameAssOkCount:
>
> ethtool -I --show-mm eth0
> MAC Merge layer state for eth0:
> pMAC enabled: on
> TX enabled: on
> TX active: on
> TX minimum fragment size: 124
> RX minimum fragment size: 124
> Verify enabled: on
> Verify time: 10
> Max verify time: 134
> Verification status: SUCCEEDED
> Statistics:
> MACMergeFrameAssErrorCount: 0
> MACMergeFrameSmdErrorCount: 0
> MACMergeFrameAssOkCount: 57018
> MACMergeFragCountRx: 57824
> MACMergeFragCountTx: 0
> MACMergeHoldCount: 0
>
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
> index c51e2af91f69..f6b081b7e754 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
> +++ b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
> @@ -11,6 +11,7 @@
> #include <linux/pm_runtime.h>
>
> #include "am65-cpsw-nuss.h"
> +#include "am65-cpsw-qos.h"
> #include "cpsw_ale.h"
> #include "am65-cpts.h"
>
> @@ -715,6 +716,152 @@ static int am65_cpsw_set_ethtool_priv_flags(struct net_device *ndev, u32 flags)
> return 0;
> }
>
> +static void am65_cpsw_port_iet_rx_enable(struct am65_cpsw_port *port, bool enable)
> +{
> + u32 val;
> +
> + val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
> + if (enable)
> + val |= AM65_CPSW_PN_CTL_IET_PORT_EN;
> + else
> + val &= ~AM65_CPSW_PN_CTL_IET_PORT_EN;
> +
> + writel(val, port->port_base + AM65_CPSW_PN_REG_CTL);
> + am65_cpsw_iet_common_enable(port->common);
> +}
> +
> +static void am65_cpsw_port_iet_tx_enable(struct am65_cpsw_port *port, bool enable)
> +{
> + u32 val;
> +
> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + if (enable)
> + val |= AM65_CPSW_PN_IET_MAC_PENABLE;
> + else
> + val &= ~AM65_CPSW_PN_IET_MAC_PENABLE;
> +
> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> +}
> +
> +static int am65_cpsw_get_mm(struct net_device *ndev, struct ethtool_mm_state *state)
> +{
> + struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
> + struct am65_cpsw_ndev_priv *priv = netdev_priv(ndev);
> + u32 port_ctrl, iet_ctrl, iet_status;
> + u32 add_frag_size;
> +
> + mutex_lock(&priv->mm_lock);
> +
> + iet_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + port_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
> +
> + state->tx_enabled = !!(iet_ctrl & AM65_CPSW_PN_IET_MAC_PENABLE);
> + state->pmac_enabled = !!(port_ctrl & AM65_CPSW_PN_CTL_IET_PORT_EN);
> +
> + iet_status = readl(port->port_base + AM65_CPSW_PN_REG_IET_STATUS);
> +
> + if (iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY)
> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_DISABLED;
> + else if (iet_status & AM65_CPSW_PN_MAC_VERIFIED)
> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED;
> + else if (iet_status & AM65_CPSW_PN_MAC_VERIFY_FAIL)
> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_FAILED;
> + else
> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_UNKNOWN;
> +
> + add_frag_size = AM65_CPSW_PN_IET_MAC_GET_ADDFRAGSIZE(iet_ctrl);
> + state->tx_min_frag_size = ethtool_mm_frag_size_add_to_min(add_frag_size);
> +
> + /* Errata i2208: RX min fragment size cannot be less than 124 */
> + state->rx_min_frag_size = 124;
> +
> + /* FPE active if common tx_enabled and verification success or disabled (forced) */
> + state->tx_active = state->tx_enabled &&
> + (state->verify_status == ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED ||
> + state->verify_status == ETHTOOL_MM_VERIFY_STATUS_DISABLED);
> + state->verify_enabled = !(iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY);
> +
> + state->verify_time = port->qos.iet.verify_time_ms;
> + state->max_verify_time = am65_cpsw_iet_get_verify_timeout_ms(AM65_CPSW_PN_MAC_VERIFY_CNT_MASK,
> + port);
> + mutex_unlock(&priv->mm_lock);
> +
> + return 0;
> +}
> +
> +static int am65_cpsw_set_mm(struct net_device *ndev, struct ethtool_mm_cfg *cfg,
> + struct netlink_ext_ack *extack)
> +{
> + struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
> + struct am65_cpsw_ndev_priv *priv = netdev_priv(ndev);
> + struct am65_cpsw_iet *iet = &port->qos.iet;
> + u32 val, add_frag_size;
> + int err;
> +
> + err = ethtool_mm_frag_size_min_to_add(cfg->tx_min_frag_size, &add_frag_size, extack);
> + if (err)
> + return err;
> +
> + mutex_lock(&priv->mm_lock);
> +
> + if (cfg->pmac_enabled) {
> + /* change TX & RX FIFO MAX_BLKS as per TRM recommendation */
> + if (!iet->original_max_blks)
> + iet->original_max_blks = readl(port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
> +
> + writel(AM65_CPSW_PN_TX_RX_MAX_BLKS_IET,
> + port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
> + } else {
> + /* restore RX & TX FIFO MAX_BLKS */
> + if (iet->original_max_blks) {
> + writel(iet->original_max_blks,
> + port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
> + }
> + }
> +
> + am65_cpsw_port_iet_rx_enable(port, cfg->pmac_enabled);
> + am65_cpsw_port_iet_tx_enable(port, cfg->tx_enabled);
> +
> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + if (cfg->verify_enabled) {
> + val &= ~AM65_CPSW_PN_IET_MAC_DISABLEVERIFY;
> + /* Reset Verify state machine. Verification won't start here.
> + * Verification will be done once link-up.
> + */
> + val |= AM65_CPSW_PN_IET_MAC_LINKFAIL;
> + } else {
> + val |= AM65_CPSW_PN_IET_MAC_DISABLEVERIFY;
> + }
> +
> + val &= ~AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK;
> + val |= AM65_CPSW_PN_IET_MAC_SET_ADDFRAGSIZE(add_frag_size);
> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> +
> + /* verify_timeout_count can only be set at valid link */
> + port->qos.iet.verify_time_ms = cfg->verify_time;
> +
> + /* enable/disable pre-emption based on link status */
> + am65_cpsw_iet_commit_preemptible_tcs(port);
> +
> + mutex_unlock(&priv->mm_lock);
> +
> + return 0;
> +}
> +
> +static void am65_cpsw_get_mm_stats(struct net_device *ndev,
> + struct ethtool_mm_stats *s)
> +{
> + struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
> + void __iomem *base = port->stat_base;
> +
> + s->MACMergeFrameAssOkCount = readl(base + AM65_CPSW_STATN_IET_RX_ASSEMBLY_OK);
> + s->MACMergeFrameAssErrorCount = readl(base + AM65_CPSW_STATN_IET_RX_ASSEMBLY_ERROR);
> + s->MACMergeFrameSmdErrorCount = readl(base + AM65_CPSW_STATN_IET_RX_SMD_ERROR);
> + s->MACMergeFragCountRx = readl(base + AM65_CPSW_STATN_IET_RX_FRAG);
> + s->MACMergeFragCountTx = readl(base + AM65_CPSW_STATN_IET_TX_FRAG);
> + s->MACMergeHoldCount = readl(base + AM65_CPSW_STATN_IET_TX_HOLD);
> +}
> +
> const struct ethtool_ops am65_cpsw_ethtool_ops_slave = {
> .begin = am65_cpsw_ethtool_op_begin,
> .complete = am65_cpsw_ethtool_op_complete,
> @@ -743,4 +890,7 @@ const struct ethtool_ops am65_cpsw_ethtool_ops_slave = {
> .get_eee = am65_cpsw_get_eee,
> .set_eee = am65_cpsw_set_eee,
> .nway_reset = am65_cpsw_nway_reset,
> + .get_mm = am65_cpsw_get_mm,
> + .set_mm = am65_cpsw_set_mm,
> + .get_mm_stats = am65_cpsw_get_mm_stats,
> };
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> index bea6fc0f324c..2004f6a020d3 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> @@ -2161,6 +2161,8 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
> ndev_priv = netdev_priv(port->ndev);
> ndev_priv->port = port;
> ndev_priv->msg_enable = AM65_CPSW_DEBUG;
> + mutex_init(&ndev_priv->mm_lock);
> + port->qos.link_speed = SPEED_UNKNOWN;
> SET_NETDEV_DEV(port->ndev, dev);
>
> eth_hw_addr_set(port->ndev, port->slave.mac_addr);
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.h b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
> index f3dad2ab9828..1e4a045057fc 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.h
> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
> @@ -145,6 +145,7 @@ struct am65_cpsw_common {
> bool pf_p0_rx_ptype_rrobin;
> struct am65_cpts *cpts;
> int est_enabled;
> + bool iet_enabled;
>
> bool is_emac_mode;
> u16 br_members;
> @@ -170,6 +171,10 @@ struct am65_cpsw_ndev_priv {
> struct am65_cpsw_port *port;
> struct am65_cpsw_ndev_stats __percpu *stats;
> bool offload_fwd_mark;
> + /* Serialize access to MAC Merge state between ethtool requests
> + * and link state updates
> + */
> + struct mutex mm_lock;
> };
>
> #define am65_ndev_to_priv(ndev) \
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-qos.c b/drivers/net/ethernet/ti/am65-cpsw-qos.c
> index 991221d8f148..ec2986e79edd 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-qos.c
> +++ b/drivers/net/ethernet/ti/am65-cpsw-qos.c
> @@ -4,9 +4,11 @@
> *
> * quality of service module includes:
> * Enhanced Scheduler Traffic (EST - P802.1Qbv/D2.2)
> + * Interspersed Express Traffic (IET - P802.3br/D2.0)
> */
>
> #include <linux/pm_runtime.h>
> +#include <linux/units.h>
> #include <linux/time.h>
> #include <net/pkt_cls.h>
>
> @@ -15,50 +17,6 @@
> #include "am65-cpts.h"
> #include "cpsw_ale.h"
>
> -#define AM65_CPSW_REG_CTL 0x004
> -#define AM65_CPSW_P0_REG_TX_PRI_MAP 0x018
> -#define AM65_CPSW_P0_REG_RX_PRI_MAP 0x020
> -#define AM65_CPSW_P0_REG_FIFO_STATUS 0x050
> -#define AM65_CPSW_P0_REG_PRI_CIR(pri) (0x140 + 4 * (pri))
> -#define AM65_CPSW_P0_REG_PRI_EIR(pri) (0x160 + 4 * (pri))
> -
> -#define AM65_CPSW_PN_REG_CTL 0x004
> -#define AM65_CPSW_PN_REG_TX_PRI_MAP 0x018
> -#define AM65_CPSW_PN_REG_RX_PRI_MAP 0x020
> -#define AM65_CPSW_PN_REG_FIFO_STATUS 0x050
> -#define AM65_CPSW_PN_REG_EST_CTL 0x060
> -#define AM65_CPSW_PN_REG_PRI_CIR(pri) (0x140 + 4 * (pri))
> -#define AM65_CPSW_PN_REG_PRI_EIR(pri) (0x160 + 4 * (pri))
> -
> -/* AM65_CPSW_REG_CTL register fields */
> -#define AM65_CPSW_CTL_EST_EN BIT(18)
> -
> -/* AM65_CPSW_PN_REG_CTL register fields */
> -#define AM65_CPSW_PN_CTL_EST_PORT_EN BIT(17)
> -
> -/* AM65_CPSW_PN_REG_EST_CTL register fields */
> -#define AM65_CPSW_PN_EST_ONEBUF BIT(0)
> -#define AM65_CPSW_PN_EST_BUFSEL BIT(1)
> -#define AM65_CPSW_PN_EST_TS_EN BIT(2)
> -#define AM65_CPSW_PN_EST_TS_FIRST BIT(3)
> -#define AM65_CPSW_PN_EST_ONEPRI BIT(4)
> -#define AM65_CPSW_PN_EST_TS_PRI_MSK GENMASK(7, 5)
> -
> -/* AM65_CPSW_PN_REG_FIFO_STATUS register fields */
> -#define AM65_CPSW_PN_FST_TX_PRI_ACTIVE_MSK GENMASK(7, 0)
> -#define AM65_CPSW_PN_FST_TX_E_MAC_ALLOW_MSK GENMASK(15, 8)
> -#define AM65_CPSW_PN_FST_EST_CNT_ERR BIT(16)
> -#define AM65_CPSW_PN_FST_EST_ADD_ERR BIT(17)
> -#define AM65_CPSW_PN_FST_EST_BUFACT BIT(18)
> -
> -/* EST FETCH COMMAND RAM */
> -#define AM65_CPSW_FETCH_RAM_CMD_NUM 0x80
> -#define AM65_CPSW_FETCH_CNT_MSK GENMASK(21, 8)
> -#define AM65_CPSW_FETCH_CNT_MAX (AM65_CPSW_FETCH_CNT_MSK >> 8)
> -#define AM65_CPSW_FETCH_CNT_OFFSET 8
> -#define AM65_CPSW_FETCH_ALLOW_MSK GENMASK(7, 0)
> -#define AM65_CPSW_FETCH_ALLOW_MAX AM65_CPSW_FETCH_ALLOW_MSK
> -
> #define TO_MBPS(x) ((x) * 8 / 1000000)
>
> enum timer_act {
> @@ -67,10 +25,193 @@ enum timer_act {
> TACT_SKIP_PROG, /* just buffer can be updated */
> };
>
> -/* number of priority queues per port FIFO */
> -#define AM65_CPSW_PN_FIFO_PRIO_NUM 8
> -#define AM65_CPSW_PN_TX_PRI_MAP_DEFAULT 0x76543210
> +/* IET */
> +static int am65_cpsw_iet_set_verify_timeout_count(struct am65_cpsw_port *port)
> +{
> + int verify_time_ms = port->qos.iet.verify_time_ms;
> + int link_speed = port->qos.link_speed;
> + u32 val;
> +
> + if (WARN_ON(link_speed == SPEED_UNKNOWN))
> + return -ENODEV;
> +
> + /* The number of wireside clocks contained in the verify
> + * timeout counter. The default is 0x1312d0
> + * (10ms at 125Mhz in 1G mode).
> + */
> + val = 125 * HZ_PER_MHZ; /* assuming 125MHz wireside clock */
> +
> + val /= MILLIHZ_PER_HZ; /* count per ms timeout */
> + val *= verify_time_ms; /* count for timeout ms */
> + if (link_speed < SPEED_1000)
> + val <<= 1; /* FIXME: Is this correct? */
> +
> + if (val > AM65_CPSW_PN_MAC_VERIFY_CNT_MASK)
> + return -EINVAL;
> +
> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_VERIFY);
> +
> + return 0;
> +}
> +
> +unsigned int am65_cpsw_iet_get_verify_timeout_ms(u32 count, struct am65_cpsw_port *port)
> +{
> + int link_speed = port->qos.link_speed;
> + u32 val = 125 * HZ_PER_MHZ; /* assuming 125MHz wireside clock */
> + unsigned int timeout_ms;
> +
> + if (link_speed == SPEED_UNKNOWN)
> + link_speed = SPEED_1000;
> +
> + val /= MILLIHZ_PER_HZ; /* count per ms timeout */
> +
> + timeout_ms = count / val;
> +
> + if (link_speed < SPEED_1000)
> + timeout_ms >>= 1; /* FIXME: Is this correct? */
> +
> + return timeout_ms;
> +}
> +
> +static int am65_cpsw_iet_verify_wait(struct am65_cpsw_port *port)
> +{
> + u32 ctrl, status;
> + int try;
> +
> + try = 20;
> + do {
> + /* Clear MAC_LINKFAIL bit to start Verify. */
> + ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + ctrl &= ~AM65_CPSW_PN_IET_MAC_LINKFAIL;
> + writel(ctrl, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> +
> + msleep(port->qos.iet.verify_time_ms);
> +
> + status = readl(port->port_base + AM65_CPSW_PN_REG_IET_STATUS);
> + if (status & AM65_CPSW_PN_MAC_VERIFIED)
> + return 0;
> +
> + if (status & AM65_CPSW_PN_MAC_VERIFY_FAIL) {
> + netdev_dbg(port->ndev,
> + "MAC Merge verify failed, trying again");
> + /* Reset the verify state machine by writing 1
> + * to LINKFAIL
> + */
> + ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + ctrl |= AM65_CPSW_PN_IET_MAC_LINKFAIL;
> + writel(ctrl, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + continue;
> + }
> +
> + if (status & AM65_CPSW_PN_MAC_RESPOND_ERR) {
> + netdev_dbg(port->ndev, "MAC Merge respond error");
> + return -ENODEV;
> + }
> +
> + if (status & AM65_CPSW_PN_MAC_VERIFY_ERR) {
> + netdev_dbg(port->ndev, "MAC Merge verify error");
> + return -ENODEV;
> + }
> + } while (try-- > 0);
> +
> + netdev_dbg(port->ndev, "MAC Merge verify timeout");
> + return -ETIMEDOUT;
> +}
> +
> +static void am65_cpsw_iet_set_preempt_mask(struct am65_cpsw_port *port, u8 preemptible_tcs)
> +{
> + u32 val;
> +
> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + val &= ~AM65_CPSW_PN_IET_MAC_PREMPT_MASK;
> + val |= AM65_CPSW_PN_IET_MAC_SET_PREEMPT(preemptible_tcs);
> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> +}
> +
> +/* enable common IET_ENABLE only if at least 1 port has rx IET enabled.
> + * UAPI doesn't allow tx enable without rx enable.
> + */
> +void am65_cpsw_iet_common_enable(struct am65_cpsw_common *common)
> +{
> + struct am65_cpsw_port *port;
> + bool rx_enable = false;
> + u32 val;
> + int i;
> +
> + for (i = 0; i < common->port_num; i++) {
> + port = &common->ports[i];
> + val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
> + rx_enable = !!(val & AM65_CPSW_PN_CTL_IET_PORT_EN);
> + if (rx_enable)
> + break;
> + }
> +
> + val = readl(common->cpsw_base + AM65_CPSW_REG_CTL);
> +
> + if (rx_enable)
> + val |= AM65_CPSW_CTL_IET_EN;
> + else
> + val &= ~AM65_CPSW_CTL_IET_EN;
> +
> + writel(val, common->cpsw_base + AM65_CPSW_REG_CTL);
> + common->iet_enabled = rx_enable;
> +}
> +
> +/* CPSW does not have an IRQ to notify changes to the MAC Merge TX status
> + * (active/inactive), but the preemptible traffic classes should only be
> + * committed to hardware once TX is active. Resort to polling.
> + */
> +void am65_cpsw_iet_commit_preemptible_tcs(struct am65_cpsw_port *port)
> +{
> + u8 preemptible_tcs = 0;
> + int err;
> + u32 val;
> +
> + if (port->qos.link_speed == SPEED_UNKNOWN)
> + return;
> +
> + val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
> + if (!(val & AM65_CPSW_PN_CTL_IET_PORT_EN))
> + return;
> +
> + /* update common IET enable */
> + am65_cpsw_iet_common_enable(port->common);
>
> + /* update verify count */
> + err = am65_cpsw_iet_set_verify_timeout_count(port);
> + if (err) {
> + netdev_err(port->ndev, "couldn't set verify count: %d\n", err);
> + return;
> + }
> +
> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> + if (!(val & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY)) {
> + err = am65_cpsw_iet_verify_wait(port);
> + if (err)
> + return;
> + }
> +
> + preemptible_tcs = port->qos.iet.preemptible_tcs;
> + am65_cpsw_iet_set_preempt_mask(port, preemptible_tcs);
> +}
> +
> +static void am65_cpsw_iet_change_preemptible_tcs(struct am65_cpsw_port *port, u8 preemptible_tcs)
> +{
> + port->qos.iet.preemptible_tcs = preemptible_tcs;
> + am65_cpsw_iet_commit_preemptible_tcs(port);
I'm sorry for the late feedback, but I was unable to notice the
following before.
It looks like am65_cpsw_iet_commit_preemptible_tcs() is always invoked
with the priv->mm_lock lock held, except in the above call that can be
reached without such lock held, via the am65_cpsw_qos_ndo_setup_tc().
Is that safe? If so I think it deserves at least a comment in the code.
Cheers,
Paolo
On Wed, Sep 27, 2023 at 10:27:40AM +0300, Roger Quadros wrote:
> Add driver support for viewing / changing the MAC Merge sublayer
> parameters and seeing the verification state machine's current state
> via ethtool.
>
> As hardware does not support interrupt notification for verification
> events we resort to polling on link up. On link up we try a couple of
> times for verification success and if unsuccessful then give up.
>
> The Frame Preemption feature is described in the Technical Reference
> Manual [1] in section:
> 12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
>
> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
>
> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
>
> Signed-off-by: Roger Quadros <rogerq@kernel.org>
> ---
> drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 150 ++++++++++++
> drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +
> drivers/net/ethernet/ti/am65-cpsw-nuss.h | 5 +
> drivers/net/ethernet/ti/am65-cpsw-qos.c | 240 ++++++++++++++++----
> drivers/net/ethernet/ti/am65-cpsw-qos.h | 104 +++++++++
> 5 files changed, 454 insertions(+), 47 deletions(-)
>
> Changelog:
> v5:
> - No change
>
> v4:
> - Rebase and include in the same series as mqprio support.
>
> v3:
> - Rebase on top of v6.6-rc1 and mqprio support [1]
> - Support ethtool_ops :: get_mm_stats()
> - drop unused variables cmn_ctrl and verify_cnt
> - make am65_cpsw_iet_link_state_update() and
> am65_cpsw_iet_change_preemptible_tcs() static
>
> [1] https://lore.kernel.org/all/20230918075358.5878-1-rogerq@kernel.org/
>
> v2:
> - Use proper control bits for PMAC enable (AM65_CPSW_PN_CTL_IET_PORT_EN)
> and TX enable (AM65_CPSW_PN_IET_MAC_PENABLE)
> - Common IET Enable (AM65_CPSW_CTL_IET_EN) is set if any port has
> AM65_CPSW_PN_CTL_IET_PORT_EN set.
> - Fix workaround for erratum i2208. i.e. Limit rx_min_frag_size to 124
> - Fix am65_cpsw_iet_get_verify_timeout_ms() to default to timeout for
> 1G link if link is inactive.
> - resize the RX FIFO based on pmac_enabled, not tx_enabled.
>
> Test Procedure:
>
> - 2 EVMs with AM65-CPSW network port connected to each other
> - Run iet-setup-mqprio.sh on both
>
> #!/bin/sh
> #iet-setup-mqprio.sh
>
> ifconfig eth0 down
> ifconfig eth1 down
> ethtool -L eth0 tx 4
> ethtool --set-mm eth0 pmac-enabled on tx-enabled on verify-enabled on verify-time 10 tx-min-frag-size 124
> ifconfig eth0 up
> sleep 10
>
> tc qdisc add dev eth0 handle 100: root mqprio \
> num_tc 4 \
> map 0 1 2 3 \
> queues 1@0 1@1 1@2 1@3 \
> hw 1 \
> mode dcb \
> fp P P P E
>
> tc -g class show dev eth0
> tc qdisc add dev eth0 clsact
> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5002 0xffff action skbedit priority 2
> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5003 0xffff action skbedit priority 3
> ip addr add 192.168.3.102/24 dev eth0
>
> - check that MAC merge verification has succeeded
>
> ethtool --show-mm eth0
>
> MAC Merge layer state for eth0:
> pMAC enabled: on
> TX enabled: on
> TX active: on
> TX minimum fragment size: 124
> RX minimum fragment size: 124
> Verify enabled: on
> Verify time: 10
> Max verify time: 134
> Verification status: SUCCEEDED
>
> - On receiver EVM run 2 iperf instances
>
> iperf3 -s -i30 -p5002&
> iperf3 -s -i30 -p5003&
>
> - On sender EVM run 2 iperf instances
>
> iperf3 -c 192.168.3.102 -u -b200M -l1472 -u -t5 -i30 -p5002&
> iperf3 -c 192.168.3.102 -u -b50M -l1472 -u -t5 -i30 -p5003&
>
> - Check IET stats on sender. Look for MACMergeFragCountTx: increments
>
> ethtool -I --show-mm eth0
> MAC Merge layer state for eth0:
> pMAC enabled: on
> TX enabled: on
> TX active: on
> TX minimum fragment size: 124
> RX minimum fragment size: 124
> Verify enabled: on
> Verify time: 10
> Max verify time: 134
> Verification status: SUCCEEDED
> Statistics:
> MACMergeFrameAssErrorCount: 0
> MACMergeFrameSmdErrorCount: 0
> MACMergeFrameAssOkCount: 0
> MACMergeFragCountRx: 0
> MACMergeFragCountTx: 57824
> MACMergeHoldCount: 0
>
> - Check IET stats on receiver. Look for MACMergeFragCountRx: and
> MACMergeFrameAssOkCount:
>
> ethtool -I --show-mm eth0
> MAC Merge layer state for eth0:
> pMAC enabled: on
> TX enabled: on
> TX active: on
> TX minimum fragment size: 124
> RX minimum fragment size: 124
> Verify enabled: on
> Verify time: 10
> Max verify time: 134
> Verification status: SUCCEEDED
> Statistics:
> MACMergeFrameAssErrorCount: 0
> MACMergeFrameSmdErrorCount: 0
> MACMergeFrameAssOkCount: 57018
> MACMergeFragCountRx: 57824
> MACMergeFragCountTx: 0
> MACMergeHoldCount: 0
Nice of you to post commands, but could you also please clearly state
whether the implementation passes tools/testing/selftests/net/forwarding/ethtool_mm.sh?
> + val &= ~AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK;
> + val |= AM65_CPSW_PN_IET_MAC_SET_ADDFRAGSIZE(add_frag_size);
> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
> +
> + /* verify_timeout_count can only be set at valid link */
> + port->qos.iet.verify_time_ms = cfg->verify_time;
> +
> + /* enable/disable pre-emption based on link status */
For the benefit of grep, I would appreciate if it was spelled
"preemption" everywhere.
> + am65_cpsw_iet_commit_preemptible_tcs(port);
> +
> + mutex_unlock(&priv->mm_lock);
> +
> + return 0;
> +}
> +
> static int am65_cpsw_port_est_enabled(struct am65_cpsw_port *port)
> {
> return port->qos.est_oper || port->qos.est_admin;
> @@ -602,6 +743,8 @@ static int am65_cpsw_setup_taprio(struct net_device *ndev, void *type_data)
> if (port->qos.link_speed == SPEED_UNKNOWN)
> return -ENOLINK;
>
> + am65_cpsw_iet_change_preemptible_tcs(port, taprio->mqprio.preemptible_tcs);
> +
Hmm, why just look at the preemptible traffic classes and not at
taprio's entire mqprio configuration? This bypasses the mapping between
Linux traffic classes and switch priorities that you've established in
am65_cpsw_setup_mqprio().
With the addition of the "mqprio" structure in tc_taprio_qopt_offload,
my intention was to facilitate calling am65_cpsw_setup_mqprio() from
am65_cpsw_setup_taprio().
> return am65_cpsw_set_taprio(ndev, type_data);
> }
On 05/10/2023 10:57, Paolo Abeni wrote:
> On Wed, 2023-09-27 at 10:27 +0300, Roger Quadros wrote:
>> Add driver support for viewing / changing the MAC Merge sublayer
>> parameters and seeing the verification state machine's current state
>> via ethtool.
>>
>> As hardware does not support interrupt notification for verification
>> events we resort to polling on link up. On link up we try a couple of
>> times for verification success and if unsuccessful then give up.
>>
>> The Frame Preemption feature is described in the Technical Reference
>> Manual [1] in section:
>> 12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
>>
>> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
>>
>> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
>> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
>>
>> Signed-off-by: Roger Quadros <rogerq@kernel.org>
>> ---
>> drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 150 ++++++++++++
>> drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +
>> drivers/net/ethernet/ti/am65-cpsw-nuss.h | 5 +
>> drivers/net/ethernet/ti/am65-cpsw-qos.c | 240 ++++++++++++++++----
>> drivers/net/ethernet/ti/am65-cpsw-qos.h | 104 +++++++++
>> 5 files changed, 454 insertions(+), 47 deletions(-)
>>
>> Changelog:
>> v5:
>> - No change
>>
>> v4:
>> - Rebase and include in the same series as mqprio support.
>>
>> v3:
>> - Rebase on top of v6.6-rc1 and mqprio support [1]
>> - Support ethtool_ops :: get_mm_stats()
>> - drop unused variables cmn_ctrl and verify_cnt
>> - make am65_cpsw_iet_link_state_update() and
>> am65_cpsw_iet_change_preemptible_tcs() static
>>
>> [1] https://lore.kernel.org/all/20230918075358.5878-1-rogerq@kernel.org/
>>
>> v2:
>> - Use proper control bits for PMAC enable (AM65_CPSW_PN_CTL_IET_PORT_EN)
>> and TX enable (AM65_CPSW_PN_IET_MAC_PENABLE)
>> - Common IET Enable (AM65_CPSW_CTL_IET_EN) is set if any port has
>> AM65_CPSW_PN_CTL_IET_PORT_EN set.
>> - Fix workaround for erratum i2208. i.e. Limit rx_min_frag_size to 124
>> - Fix am65_cpsw_iet_get_verify_timeout_ms() to default to timeout for
>> 1G link if link is inactive.
>> - resize the RX FIFO based on pmac_enabled, not tx_enabled.
>>
>> Test Procedure:
>>
>> - 2 EVMs with AM65-CPSW network port connected to each other
>> - Run iet-setup-mqprio.sh on both
>>
>> #!/bin/sh
>> #iet-setup-mqprio.sh
>>
>> ifconfig eth0 down
>> ifconfig eth1 down
>> ethtool -L eth0 tx 4
>> ethtool --set-mm eth0 pmac-enabled on tx-enabled on verify-enabled on verify-time 10 tx-min-frag-size 124
>> ifconfig eth0 up
>> sleep 10
>>
>> tc qdisc add dev eth0 handle 100: root mqprio \
>> num_tc 4 \
>> map 0 1 2 3 \
>> queues 1@0 1@1 1@2 1@3 \
>> hw 1 \
>> mode dcb \
>> fp P P P E
>>
>> tc -g class show dev eth0
>> tc qdisc add dev eth0 clsact
>> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5002 0xffff action skbedit priority 2
>> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5003 0xffff action skbedit priority 3
>> ip addr add 192.168.3.102/24 dev eth0
>>
>> - check that MAC merge verification has succeeded
>>
>> ethtool --show-mm eth0
>>
>> MAC Merge layer state for eth0:
>> pMAC enabled: on
>> TX enabled: on
>> TX active: on
>> TX minimum fragment size: 124
>> RX minimum fragment size: 124
>> Verify enabled: on
>> Verify time: 10
>> Max verify time: 134
>> Verification status: SUCCEEDED
>>
>> - On receiver EVM run 2 iperf instances
>>
>> iperf3 -s -i30 -p5002&
>> iperf3 -s -i30 -p5003&
>>
>> - On sender EVM run 2 iperf instances
>>
>> iperf3 -c 192.168.3.102 -u -b200M -l1472 -u -t5 -i30 -p5002&
>> iperf3 -c 192.168.3.102 -u -b50M -l1472 -u -t5 -i30 -p5003&
>>
>> - Check IET stats on sender. Look for MACMergeFragCountTx: increments
>>
>> ethtool -I --show-mm eth0
>> MAC Merge layer state for eth0:
>> pMAC enabled: on
>> TX enabled: on
>> TX active: on
>> TX minimum fragment size: 124
>> RX minimum fragment size: 124
>> Verify enabled: on
>> Verify time: 10
>> Max verify time: 134
>> Verification status: SUCCEEDED
>> Statistics:
>> MACMergeFrameAssErrorCount: 0
>> MACMergeFrameSmdErrorCount: 0
>> MACMergeFrameAssOkCount: 0
>> MACMergeFragCountRx: 0
>> MACMergeFragCountTx: 57824
>> MACMergeHoldCount: 0
>>
>> - Check IET stats on receiver. Look for MACMergeFragCountRx: and
>> MACMergeFrameAssOkCount:
>>
>> ethtool -I --show-mm eth0
>> MAC Merge layer state for eth0:
>> pMAC enabled: on
>> TX enabled: on
>> TX active: on
>> TX minimum fragment size: 124
>> RX minimum fragment size: 124
>> Verify enabled: on
>> Verify time: 10
>> Max verify time: 134
>> Verification status: SUCCEEDED
>> Statistics:
>> MACMergeFrameAssErrorCount: 0
>> MACMergeFrameSmdErrorCount: 0
>> MACMergeFrameAssOkCount: 57018
>> MACMergeFragCountRx: 57824
>> MACMergeFragCountTx: 0
>> MACMergeHoldCount: 0
>>
>> diff --git a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
>> index c51e2af91f69..f6b081b7e754 100644
>> --- a/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
>> +++ b/drivers/net/ethernet/ti/am65-cpsw-ethtool.c
>> @@ -11,6 +11,7 @@
>> #include <linux/pm_runtime.h>
>>
>> #include "am65-cpsw-nuss.h"
>> +#include "am65-cpsw-qos.h"
>> #include "cpsw_ale.h"
>> #include "am65-cpts.h"
>>
>> @@ -715,6 +716,152 @@ static int am65_cpsw_set_ethtool_priv_flags(struct net_device *ndev, u32 flags)
>> return 0;
>> }
>>
>> +static void am65_cpsw_port_iet_rx_enable(struct am65_cpsw_port *port, bool enable)
>> +{
>> + u32 val;
>> +
>> + val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
>> + if (enable)
>> + val |= AM65_CPSW_PN_CTL_IET_PORT_EN;
>> + else
>> + val &= ~AM65_CPSW_PN_CTL_IET_PORT_EN;
>> +
>> + writel(val, port->port_base + AM65_CPSW_PN_REG_CTL);
>> + am65_cpsw_iet_common_enable(port->common);
>> +}
>> +
>> +static void am65_cpsw_port_iet_tx_enable(struct am65_cpsw_port *port, bool enable)
>> +{
>> + u32 val;
>> +
>> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + if (enable)
>> + val |= AM65_CPSW_PN_IET_MAC_PENABLE;
>> + else
>> + val &= ~AM65_CPSW_PN_IET_MAC_PENABLE;
>> +
>> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> +}
>> +
>> +static int am65_cpsw_get_mm(struct net_device *ndev, struct ethtool_mm_state *state)
>> +{
>> + struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
>> + struct am65_cpsw_ndev_priv *priv = netdev_priv(ndev);
>> + u32 port_ctrl, iet_ctrl, iet_status;
>> + u32 add_frag_size;
>> +
>> + mutex_lock(&priv->mm_lock);
>> +
>> + iet_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + port_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
>> +
>> + state->tx_enabled = !!(iet_ctrl & AM65_CPSW_PN_IET_MAC_PENABLE);
>> + state->pmac_enabled = !!(port_ctrl & AM65_CPSW_PN_CTL_IET_PORT_EN);
>> +
>> + iet_status = readl(port->port_base + AM65_CPSW_PN_REG_IET_STATUS);
>> +
>> + if (iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY)
>> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_DISABLED;
>> + else if (iet_status & AM65_CPSW_PN_MAC_VERIFIED)
>> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED;
>> + else if (iet_status & AM65_CPSW_PN_MAC_VERIFY_FAIL)
>> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_FAILED;
>> + else
>> + state->verify_status = ETHTOOL_MM_VERIFY_STATUS_UNKNOWN;
>> +
>> + add_frag_size = AM65_CPSW_PN_IET_MAC_GET_ADDFRAGSIZE(iet_ctrl);
>> + state->tx_min_frag_size = ethtool_mm_frag_size_add_to_min(add_frag_size);
>> +
>> + /* Errata i2208: RX min fragment size cannot be less than 124 */
>> + state->rx_min_frag_size = 124;
>> +
>> + /* FPE active if common tx_enabled and verification success or disabled (forced) */
>> + state->tx_active = state->tx_enabled &&
>> + (state->verify_status == ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED ||
>> + state->verify_status == ETHTOOL_MM_VERIFY_STATUS_DISABLED);
>> + state->verify_enabled = !(iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY);
>> +
>> + state->verify_time = port->qos.iet.verify_time_ms;
>> + state->max_verify_time = am65_cpsw_iet_get_verify_timeout_ms(AM65_CPSW_PN_MAC_VERIFY_CNT_MASK,
>> + port);
>> + mutex_unlock(&priv->mm_lock);
>> +
>> + return 0;
>> +}
>> +
>> +static int am65_cpsw_set_mm(struct net_device *ndev, struct ethtool_mm_cfg *cfg,
>> + struct netlink_ext_ack *extack)
>> +{
>> + struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
>> + struct am65_cpsw_ndev_priv *priv = netdev_priv(ndev);
>> + struct am65_cpsw_iet *iet = &port->qos.iet;
>> + u32 val, add_frag_size;
>> + int err;
>> +
>> + err = ethtool_mm_frag_size_min_to_add(cfg->tx_min_frag_size, &add_frag_size, extack);
>> + if (err)
>> + return err;
>> +
>> + mutex_lock(&priv->mm_lock);
>> +
>> + if (cfg->pmac_enabled) {
>> + /* change TX & RX FIFO MAX_BLKS as per TRM recommendation */
>> + if (!iet->original_max_blks)
>> + iet->original_max_blks = readl(port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
>> +
>> + writel(AM65_CPSW_PN_TX_RX_MAX_BLKS_IET,
>> + port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
>> + } else {
>> + /* restore RX & TX FIFO MAX_BLKS */
>> + if (iet->original_max_blks) {
>> + writel(iet->original_max_blks,
>> + port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
>> + }
>> + }
>> +
>> + am65_cpsw_port_iet_rx_enable(port, cfg->pmac_enabled);
>> + am65_cpsw_port_iet_tx_enable(port, cfg->tx_enabled);
>> +
>> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + if (cfg->verify_enabled) {
>> + val &= ~AM65_CPSW_PN_IET_MAC_DISABLEVERIFY;
>> + /* Reset Verify state machine. Verification won't start here.
>> + * Verification will be done once link-up.
>> + */
>> + val |= AM65_CPSW_PN_IET_MAC_LINKFAIL;
>> + } else {
>> + val |= AM65_CPSW_PN_IET_MAC_DISABLEVERIFY;
>> + }
>> +
>> + val &= ~AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK;
>> + val |= AM65_CPSW_PN_IET_MAC_SET_ADDFRAGSIZE(add_frag_size);
>> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> +
>> + /* verify_timeout_count can only be set at valid link */
>> + port->qos.iet.verify_time_ms = cfg->verify_time;
>> +
>> + /* enable/disable pre-emption based on link status */
>> + am65_cpsw_iet_commit_preemptible_tcs(port);
>> +
>> + mutex_unlock(&priv->mm_lock);
>> +
>> + return 0;
>> +}
>> +
>> +static void am65_cpsw_get_mm_stats(struct net_device *ndev,
>> + struct ethtool_mm_stats *s)
>> +{
>> + struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
>> + void __iomem *base = port->stat_base;
>> +
>> + s->MACMergeFrameAssOkCount = readl(base + AM65_CPSW_STATN_IET_RX_ASSEMBLY_OK);
>> + s->MACMergeFrameAssErrorCount = readl(base + AM65_CPSW_STATN_IET_RX_ASSEMBLY_ERROR);
>> + s->MACMergeFrameSmdErrorCount = readl(base + AM65_CPSW_STATN_IET_RX_SMD_ERROR);
>> + s->MACMergeFragCountRx = readl(base + AM65_CPSW_STATN_IET_RX_FRAG);
>> + s->MACMergeFragCountTx = readl(base + AM65_CPSW_STATN_IET_TX_FRAG);
>> + s->MACMergeHoldCount = readl(base + AM65_CPSW_STATN_IET_TX_HOLD);
>> +}
>> +
>> const struct ethtool_ops am65_cpsw_ethtool_ops_slave = {
>> .begin = am65_cpsw_ethtool_op_begin,
>> .complete = am65_cpsw_ethtool_op_complete,
>> @@ -743,4 +890,7 @@ const struct ethtool_ops am65_cpsw_ethtool_ops_slave = {
>> .get_eee = am65_cpsw_get_eee,
>> .set_eee = am65_cpsw_set_eee,
>> .nway_reset = am65_cpsw_nway_reset,
>> + .get_mm = am65_cpsw_get_mm,
>> + .set_mm = am65_cpsw_set_mm,
>> + .get_mm_stats = am65_cpsw_get_mm_stats,
>> };
>> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
>> index bea6fc0f324c..2004f6a020d3 100644
>> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
>> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
>> @@ -2161,6 +2161,8 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
>> ndev_priv = netdev_priv(port->ndev);
>> ndev_priv->port = port;
>> ndev_priv->msg_enable = AM65_CPSW_DEBUG;
>> + mutex_init(&ndev_priv->mm_lock);
>> + port->qos.link_speed = SPEED_UNKNOWN;
>> SET_NETDEV_DEV(port->ndev, dev);
>>
>> eth_hw_addr_set(port->ndev, port->slave.mac_addr);
>> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.h b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
>> index f3dad2ab9828..1e4a045057fc 100644
>> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.h
>> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
>> @@ -145,6 +145,7 @@ struct am65_cpsw_common {
>> bool pf_p0_rx_ptype_rrobin;
>> struct am65_cpts *cpts;
>> int est_enabled;
>> + bool iet_enabled;
>>
>> bool is_emac_mode;
>> u16 br_members;
>> @@ -170,6 +171,10 @@ struct am65_cpsw_ndev_priv {
>> struct am65_cpsw_port *port;
>> struct am65_cpsw_ndev_stats __percpu *stats;
>> bool offload_fwd_mark;
>> + /* Serialize access to MAC Merge state between ethtool requests
>> + * and link state updates
>> + */
>> + struct mutex mm_lock;
>> };
>>
>> #define am65_ndev_to_priv(ndev) \
>> diff --git a/drivers/net/ethernet/ti/am65-cpsw-qos.c b/drivers/net/ethernet/ti/am65-cpsw-qos.c
>> index 991221d8f148..ec2986e79edd 100644
>> --- a/drivers/net/ethernet/ti/am65-cpsw-qos.c
>> +++ b/drivers/net/ethernet/ti/am65-cpsw-qos.c
>> @@ -4,9 +4,11 @@
>> *
>> * quality of service module includes:
>> * Enhanced Scheduler Traffic (EST - P802.1Qbv/D2.2)
>> + * Interspersed Express Traffic (IET - P802.3br/D2.0)
>> */
>>
>> #include <linux/pm_runtime.h>
>> +#include <linux/units.h>
>> #include <linux/time.h>
>> #include <net/pkt_cls.h>
>>
>> @@ -15,50 +17,6 @@
>> #include "am65-cpts.h"
>> #include "cpsw_ale.h"
>>
>> -#define AM65_CPSW_REG_CTL 0x004
>> -#define AM65_CPSW_P0_REG_TX_PRI_MAP 0x018
>> -#define AM65_CPSW_P0_REG_RX_PRI_MAP 0x020
>> -#define AM65_CPSW_P0_REG_FIFO_STATUS 0x050
>> -#define AM65_CPSW_P0_REG_PRI_CIR(pri) (0x140 + 4 * (pri))
>> -#define AM65_CPSW_P0_REG_PRI_EIR(pri) (0x160 + 4 * (pri))
>> -
>> -#define AM65_CPSW_PN_REG_CTL 0x004
>> -#define AM65_CPSW_PN_REG_TX_PRI_MAP 0x018
>> -#define AM65_CPSW_PN_REG_RX_PRI_MAP 0x020
>> -#define AM65_CPSW_PN_REG_FIFO_STATUS 0x050
>> -#define AM65_CPSW_PN_REG_EST_CTL 0x060
>> -#define AM65_CPSW_PN_REG_PRI_CIR(pri) (0x140 + 4 * (pri))
>> -#define AM65_CPSW_PN_REG_PRI_EIR(pri) (0x160 + 4 * (pri))
>> -
>> -/* AM65_CPSW_REG_CTL register fields */
>> -#define AM65_CPSW_CTL_EST_EN BIT(18)
>> -
>> -/* AM65_CPSW_PN_REG_CTL register fields */
>> -#define AM65_CPSW_PN_CTL_EST_PORT_EN BIT(17)
>> -
>> -/* AM65_CPSW_PN_REG_EST_CTL register fields */
>> -#define AM65_CPSW_PN_EST_ONEBUF BIT(0)
>> -#define AM65_CPSW_PN_EST_BUFSEL BIT(1)
>> -#define AM65_CPSW_PN_EST_TS_EN BIT(2)
>> -#define AM65_CPSW_PN_EST_TS_FIRST BIT(3)
>> -#define AM65_CPSW_PN_EST_ONEPRI BIT(4)
>> -#define AM65_CPSW_PN_EST_TS_PRI_MSK GENMASK(7, 5)
>> -
>> -/* AM65_CPSW_PN_REG_FIFO_STATUS register fields */
>> -#define AM65_CPSW_PN_FST_TX_PRI_ACTIVE_MSK GENMASK(7, 0)
>> -#define AM65_CPSW_PN_FST_TX_E_MAC_ALLOW_MSK GENMASK(15, 8)
>> -#define AM65_CPSW_PN_FST_EST_CNT_ERR BIT(16)
>> -#define AM65_CPSW_PN_FST_EST_ADD_ERR BIT(17)
>> -#define AM65_CPSW_PN_FST_EST_BUFACT BIT(18)
>> -
>> -/* EST FETCH COMMAND RAM */
>> -#define AM65_CPSW_FETCH_RAM_CMD_NUM 0x80
>> -#define AM65_CPSW_FETCH_CNT_MSK GENMASK(21, 8)
>> -#define AM65_CPSW_FETCH_CNT_MAX (AM65_CPSW_FETCH_CNT_MSK >> 8)
>> -#define AM65_CPSW_FETCH_CNT_OFFSET 8
>> -#define AM65_CPSW_FETCH_ALLOW_MSK GENMASK(7, 0)
>> -#define AM65_CPSW_FETCH_ALLOW_MAX AM65_CPSW_FETCH_ALLOW_MSK
>> -
>> #define TO_MBPS(x) ((x) * 8 / 1000000)
>>
>> enum timer_act {
>> @@ -67,10 +25,193 @@ enum timer_act {
>> TACT_SKIP_PROG, /* just buffer can be updated */
>> };
>>
>> -/* number of priority queues per port FIFO */
>> -#define AM65_CPSW_PN_FIFO_PRIO_NUM 8
>> -#define AM65_CPSW_PN_TX_PRI_MAP_DEFAULT 0x76543210
>> +/* IET */
>> +static int am65_cpsw_iet_set_verify_timeout_count(struct am65_cpsw_port *port)
>> +{
>> + int verify_time_ms = port->qos.iet.verify_time_ms;
>> + int link_speed = port->qos.link_speed;
>> + u32 val;
>> +
>> + if (WARN_ON(link_speed == SPEED_UNKNOWN))
>> + return -ENODEV;
>> +
>> + /* The number of wireside clocks contained in the verify
>> + * timeout counter. The default is 0x1312d0
>> + * (10ms at 125Mhz in 1G mode).
>> + */
>> + val = 125 * HZ_PER_MHZ; /* assuming 125MHz wireside clock */
>> +
>> + val /= MILLIHZ_PER_HZ; /* count per ms timeout */
>> + val *= verify_time_ms; /* count for timeout ms */
>> + if (link_speed < SPEED_1000)
>> + val <<= 1; /* FIXME: Is this correct? */
>> +
>> + if (val > AM65_CPSW_PN_MAC_VERIFY_CNT_MASK)
>> + return -EINVAL;
>> +
>> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_VERIFY);
>> +
>> + return 0;
>> +}
>> +
>> +unsigned int am65_cpsw_iet_get_verify_timeout_ms(u32 count, struct am65_cpsw_port *port)
>> +{
>> + int link_speed = port->qos.link_speed;
>> + u32 val = 125 * HZ_PER_MHZ; /* assuming 125MHz wireside clock */
>> + unsigned int timeout_ms;
>> +
>> + if (link_speed == SPEED_UNKNOWN)
>> + link_speed = SPEED_1000;
>> +
>> + val /= MILLIHZ_PER_HZ; /* count per ms timeout */
>> +
>> + timeout_ms = count / val;
>> +
>> + if (link_speed < SPEED_1000)
>> + timeout_ms >>= 1; /* FIXME: Is this correct? */
>> +
>> + return timeout_ms;
>> +}
>> +
>> +static int am65_cpsw_iet_verify_wait(struct am65_cpsw_port *port)
>> +{
>> + u32 ctrl, status;
>> + int try;
>> +
>> + try = 20;
>> + do {
>> + /* Clear MAC_LINKFAIL bit to start Verify. */
>> + ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + ctrl &= ~AM65_CPSW_PN_IET_MAC_LINKFAIL;
>> + writel(ctrl, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> +
>> + msleep(port->qos.iet.verify_time_ms);
>> +
>> + status = readl(port->port_base + AM65_CPSW_PN_REG_IET_STATUS);
>> + if (status & AM65_CPSW_PN_MAC_VERIFIED)
>> + return 0;
>> +
>> + if (status & AM65_CPSW_PN_MAC_VERIFY_FAIL) {
>> + netdev_dbg(port->ndev,
>> + "MAC Merge verify failed, trying again");
>> + /* Reset the verify state machine by writing 1
>> + * to LINKFAIL
>> + */
>> + ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + ctrl |= AM65_CPSW_PN_IET_MAC_LINKFAIL;
>> + writel(ctrl, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + continue;
>> + }
>> +
>> + if (status & AM65_CPSW_PN_MAC_RESPOND_ERR) {
>> + netdev_dbg(port->ndev, "MAC Merge respond error");
>> + return -ENODEV;
>> + }
>> +
>> + if (status & AM65_CPSW_PN_MAC_VERIFY_ERR) {
>> + netdev_dbg(port->ndev, "MAC Merge verify error");
>> + return -ENODEV;
>> + }
>> + } while (try-- > 0);
>> +
>> + netdev_dbg(port->ndev, "MAC Merge verify timeout");
>> + return -ETIMEDOUT;
>> +}
>> +
>> +static void am65_cpsw_iet_set_preempt_mask(struct am65_cpsw_port *port, u8 preemptible_tcs)
>> +{
>> + u32 val;
>> +
>> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + val &= ~AM65_CPSW_PN_IET_MAC_PREMPT_MASK;
>> + val |= AM65_CPSW_PN_IET_MAC_SET_PREEMPT(preemptible_tcs);
>> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> +}
>> +
>> +/* enable common IET_ENABLE only if at least 1 port has rx IET enabled.
>> + * UAPI doesn't allow tx enable without rx enable.
>> + */
>> +void am65_cpsw_iet_common_enable(struct am65_cpsw_common *common)
>> +{
>> + struct am65_cpsw_port *port;
>> + bool rx_enable = false;
>> + u32 val;
>> + int i;
>> +
>> + for (i = 0; i < common->port_num; i++) {
>> + port = &common->ports[i];
>> + val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
>> + rx_enable = !!(val & AM65_CPSW_PN_CTL_IET_PORT_EN);
>> + if (rx_enable)
>> + break;
>> + }
>> +
>> + val = readl(common->cpsw_base + AM65_CPSW_REG_CTL);
>> +
>> + if (rx_enable)
>> + val |= AM65_CPSW_CTL_IET_EN;
>> + else
>> + val &= ~AM65_CPSW_CTL_IET_EN;
>> +
>> + writel(val, common->cpsw_base + AM65_CPSW_REG_CTL);
>> + common->iet_enabled = rx_enable;
>> +}
>> +
>> +/* CPSW does not have an IRQ to notify changes to the MAC Merge TX status
>> + * (active/inactive), but the preemptible traffic classes should only be
>> + * committed to hardware once TX is active. Resort to polling.
>> + */
>> +void am65_cpsw_iet_commit_preemptible_tcs(struct am65_cpsw_port *port)
>> +{
>> + u8 preemptible_tcs = 0;
>> + int err;
>> + u32 val;
>> +
>> + if (port->qos.link_speed == SPEED_UNKNOWN)
>> + return;
>> +
>> + val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
>> + if (!(val & AM65_CPSW_PN_CTL_IET_PORT_EN))
>> + return;
>> +
>> + /* update common IET enable */
>> + am65_cpsw_iet_common_enable(port->common);
>>
>> + /* update verify count */
>> + err = am65_cpsw_iet_set_verify_timeout_count(port);
>> + if (err) {
>> + netdev_err(port->ndev, "couldn't set verify count: %d\n", err);
>> + return;
>> + }
>> +
>> + val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> + if (!(val & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY)) {
>> + err = am65_cpsw_iet_verify_wait(port);
>> + if (err)
>> + return;
>> + }
>> +
>> + preemptible_tcs = port->qos.iet.preemptible_tcs;
>> + am65_cpsw_iet_set_preempt_mask(port, preemptible_tcs);
>> +}
>> +
>> +static void am65_cpsw_iet_change_preemptible_tcs(struct am65_cpsw_port *port, u8 preemptible_tcs)
>> +{
>> + port->qos.iet.preemptible_tcs = preemptible_tcs;
>> + am65_cpsw_iet_commit_preemptible_tcs(port);
>
> I'm sorry for the late feedback, but I was unable to notice the
> following before.
>
> It looks like am65_cpsw_iet_commit_preemptible_tcs() is always invoked
> with the priv->mm_lock lock held, except in the above call that can be
> reached without such lock held, via the am65_cpsw_qos_ndo_setup_tc().
>
> Is that safe? If so I think it deserves at least a comment in the code.
I think it is better to call it with the priv->mm_lock held. Thanks!
On 05/10/2023 12:29, Vladimir Oltean wrote:
> On Wed, Sep 27, 2023 at 10:27:40AM +0300, Roger Quadros wrote:
>> Add driver support for viewing / changing the MAC Merge sublayer
>> parameters and seeing the verification state machine's current state
>> via ethtool.
>>
>> As hardware does not support interrupt notification for verification
>> events we resort to polling on link up. On link up we try a couple of
>> times for verification success and if unsuccessful then give up.
>>
>> The Frame Preemption feature is described in the Technical Reference
>> Manual [1] in section:
>> 12.3.1.4.6.7 Intersperced Express Traffic (IET – P802.3br/D2.0)
>>
>> Due to Silicon Errata i2208 [2] we set limit min IET fragment size to 124.
>>
>> [1] AM62x TRM - https://www.ti.com/lit/ug/spruiv7a/spruiv7a.pdf
>> [2] AM62x Silicon Errata - https://www.ti.com/lit/er/sprz487c/sprz487c.pdf
>>
>> Signed-off-by: Roger Quadros <rogerq@kernel.org>
>> ---
>> drivers/net/ethernet/ti/am65-cpsw-ethtool.c | 150 ++++++++++++
>> drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 +
>> drivers/net/ethernet/ti/am65-cpsw-nuss.h | 5 +
>> drivers/net/ethernet/ti/am65-cpsw-qos.c | 240 ++++++++++++++++----
>> drivers/net/ethernet/ti/am65-cpsw-qos.h | 104 +++++++++
>> 5 files changed, 454 insertions(+), 47 deletions(-)
>>
>> Changelog:
>> v5:
>> - No change
>>
>> v4:
>> - Rebase and include in the same series as mqprio support.
>>
>> v3:
>> - Rebase on top of v6.6-rc1 and mqprio support [1]
>> - Support ethtool_ops :: get_mm_stats()
>> - drop unused variables cmn_ctrl and verify_cnt
>> - make am65_cpsw_iet_link_state_update() and
>> am65_cpsw_iet_change_preemptible_tcs() static
>>
>> [1] https://lore.kernel.org/all/20230918075358.5878-1-rogerq@kernel.org/
>>
>> v2:
>> - Use proper control bits for PMAC enable (AM65_CPSW_PN_CTL_IET_PORT_EN)
>> and TX enable (AM65_CPSW_PN_IET_MAC_PENABLE)
>> - Common IET Enable (AM65_CPSW_CTL_IET_EN) is set if any port has
>> AM65_CPSW_PN_CTL_IET_PORT_EN set.
>> - Fix workaround for erratum i2208. i.e. Limit rx_min_frag_size to 124
>> - Fix am65_cpsw_iet_get_verify_timeout_ms() to default to timeout for
>> 1G link if link is inactive.
>> - resize the RX FIFO based on pmac_enabled, not tx_enabled.
>>
>> Test Procedure:
>>
>> - 2 EVMs with AM65-CPSW network port connected to each other
>> - Run iet-setup-mqprio.sh on both
>>
>> #!/bin/sh
>> #iet-setup-mqprio.sh
>>
>> ifconfig eth0 down
>> ifconfig eth1 down
>> ethtool -L eth0 tx 4
>> ethtool --set-mm eth0 pmac-enabled on tx-enabled on verify-enabled on verify-time 10 tx-min-frag-size 124
>> ifconfig eth0 up
>> sleep 10
>>
>> tc qdisc add dev eth0 handle 100: root mqprio \
>> num_tc 4 \
>> map 0 1 2 3 \
>> queues 1@0 1@1 1@2 1@3 \
>> hw 1 \
>> mode dcb \
>> fp P P P E
>>
>> tc -g class show dev eth0
>> tc qdisc add dev eth0 clsact
>> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5002 0xffff action skbedit priority 2
>> tc filter add dev eth0 egress protocol ip prio 1 u32 match ip dport 5003 0xffff action skbedit priority 3
>> ip addr add 192.168.3.102/24 dev eth0
>>
>> - check that MAC merge verification has succeeded
>>
>> ethtool --show-mm eth0
>>
>> MAC Merge layer state for eth0:
>> pMAC enabled: on
>> TX enabled: on
>> TX active: on
>> TX minimum fragment size: 124
>> RX minimum fragment size: 124
>> Verify enabled: on
>> Verify time: 10
>> Max verify time: 134
>> Verification status: SUCCEEDED
>>
>> - On receiver EVM run 2 iperf instances
>>
>> iperf3 -s -i30 -p5002&
>> iperf3 -s -i30 -p5003&
>>
>> - On sender EVM run 2 iperf instances
>>
>> iperf3 -c 192.168.3.102 -u -b200M -l1472 -u -t5 -i30 -p5002&
>> iperf3 -c 192.168.3.102 -u -b50M -l1472 -u -t5 -i30 -p5003&
>>
>> - Check IET stats on sender. Look for MACMergeFragCountTx: increments
>>
>> ethtool -I --show-mm eth0
>> MAC Merge layer state for eth0:
>> pMAC enabled: on
>> TX enabled: on
>> TX active: on
>> TX minimum fragment size: 124
>> RX minimum fragment size: 124
>> Verify enabled: on
>> Verify time: 10
>> Max verify time: 134
>> Verification status: SUCCEEDED
>> Statistics:
>> MACMergeFrameAssErrorCount: 0
>> MACMergeFrameSmdErrorCount: 0
>> MACMergeFrameAssOkCount: 0
>> MACMergeFragCountRx: 0
>> MACMergeFragCountTx: 57824
>> MACMergeHoldCount: 0
>>
>> - Check IET stats on receiver. Look for MACMergeFragCountRx: and
>> MACMergeFrameAssOkCount:
>>
>> ethtool -I --show-mm eth0
>> MAC Merge layer state for eth0:
>> pMAC enabled: on
>> TX enabled: on
>> TX active: on
>> TX minimum fragment size: 124
>> RX minimum fragment size: 124
>> Verify enabled: on
>> Verify time: 10
>> Max verify time: 134
>> Verification status: SUCCEEDED
>> Statistics:
>> MACMergeFrameAssErrorCount: 0
>> MACMergeFrameSmdErrorCount: 0
>> MACMergeFrameAssOkCount: 57018
>> MACMergeFragCountRx: 57824
>> MACMergeFragCountTx: 0
>> MACMergeHoldCount: 0
>
> Nice of you to post commands, but could you also please clearly state
> whether the implementation passes tools/testing/selftests/net/forwarding/ethtool_mm.sh?
Honestly, I didn't spend much time with it. I will try to run
those tests and get back.
>
>> + val &= ~AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK;
>> + val |= AM65_CPSW_PN_IET_MAC_SET_ADDFRAGSIZE(add_frag_size);
>> + writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
>> +
>> + /* verify_timeout_count can only be set at valid link */
>> + port->qos.iet.verify_time_ms = cfg->verify_time;
>> +
>> + /* enable/disable pre-emption based on link status */
>
> For the benefit of grep, I would appreciate if it was spelled
> "preemption" everywhere.
OK.
>
>> + am65_cpsw_iet_commit_preemptible_tcs(port);
>> +
>> + mutex_unlock(&priv->mm_lock);
>> +
>> + return 0;
>> +}
>> +
>> static int am65_cpsw_port_est_enabled(struct am65_cpsw_port *port)
>> {
>> return port->qos.est_oper || port->qos.est_admin;
>> @@ -602,6 +743,8 @@ static int am65_cpsw_setup_taprio(struct net_device *ndev, void *type_data)
>> if (port->qos.link_speed == SPEED_UNKNOWN)
>> return -ENOLINK;
>>
>> + am65_cpsw_iet_change_preemptible_tcs(port, taprio->mqprio.preemptible_tcs);
>> +
>
> Hmm, why just look at the preemptible traffic classes and not at
> taprio's entire mqprio configuration? This bypasses the mapping between
> Linux traffic classes and switch priorities that you've established in
> am65_cpsw_setup_mqprio().
>
> With the addition of the "mqprio" structure in tc_taprio_qopt_offload,
> my intention was to facilitate calling am65_cpsw_setup_mqprio() from
> am65_cpsw_setup_taprio().
OK. I will take a look at this. Thanks!
>
>> return am65_cpsw_set_taprio(ndev, type_data);
>> }
@@ -11,6 +11,7 @@
#include <linux/pm_runtime.h>
#include "am65-cpsw-nuss.h"
+#include "am65-cpsw-qos.h"
#include "cpsw_ale.h"
#include "am65-cpts.h"
@@ -715,6 +716,152 @@ static int am65_cpsw_set_ethtool_priv_flags(struct net_device *ndev, u32 flags)
return 0;
}
+static void am65_cpsw_port_iet_rx_enable(struct am65_cpsw_port *port, bool enable)
+{
+ u32 val;
+
+ val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
+ if (enable)
+ val |= AM65_CPSW_PN_CTL_IET_PORT_EN;
+ else
+ val &= ~AM65_CPSW_PN_CTL_IET_PORT_EN;
+
+ writel(val, port->port_base + AM65_CPSW_PN_REG_CTL);
+ am65_cpsw_iet_common_enable(port->common);
+}
+
+static void am65_cpsw_port_iet_tx_enable(struct am65_cpsw_port *port, bool enable)
+{
+ u32 val;
+
+ val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ if (enable)
+ val |= AM65_CPSW_PN_IET_MAC_PENABLE;
+ else
+ val &= ~AM65_CPSW_PN_IET_MAC_PENABLE;
+
+ writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+}
+
+static int am65_cpsw_get_mm(struct net_device *ndev, struct ethtool_mm_state *state)
+{
+ struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
+ struct am65_cpsw_ndev_priv *priv = netdev_priv(ndev);
+ u32 port_ctrl, iet_ctrl, iet_status;
+ u32 add_frag_size;
+
+ mutex_lock(&priv->mm_lock);
+
+ iet_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ port_ctrl = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
+
+ state->tx_enabled = !!(iet_ctrl & AM65_CPSW_PN_IET_MAC_PENABLE);
+ state->pmac_enabled = !!(port_ctrl & AM65_CPSW_PN_CTL_IET_PORT_EN);
+
+ iet_status = readl(port->port_base + AM65_CPSW_PN_REG_IET_STATUS);
+
+ if (iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY)
+ state->verify_status = ETHTOOL_MM_VERIFY_STATUS_DISABLED;
+ else if (iet_status & AM65_CPSW_PN_MAC_VERIFIED)
+ state->verify_status = ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED;
+ else if (iet_status & AM65_CPSW_PN_MAC_VERIFY_FAIL)
+ state->verify_status = ETHTOOL_MM_VERIFY_STATUS_FAILED;
+ else
+ state->verify_status = ETHTOOL_MM_VERIFY_STATUS_UNKNOWN;
+
+ add_frag_size = AM65_CPSW_PN_IET_MAC_GET_ADDFRAGSIZE(iet_ctrl);
+ state->tx_min_frag_size = ethtool_mm_frag_size_add_to_min(add_frag_size);
+
+ /* Errata i2208: RX min fragment size cannot be less than 124 */
+ state->rx_min_frag_size = 124;
+
+ /* FPE active if common tx_enabled and verification success or disabled (forced) */
+ state->tx_active = state->tx_enabled &&
+ (state->verify_status == ETHTOOL_MM_VERIFY_STATUS_SUCCEEDED ||
+ state->verify_status == ETHTOOL_MM_VERIFY_STATUS_DISABLED);
+ state->verify_enabled = !(iet_ctrl & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY);
+
+ state->verify_time = port->qos.iet.verify_time_ms;
+ state->max_verify_time = am65_cpsw_iet_get_verify_timeout_ms(AM65_CPSW_PN_MAC_VERIFY_CNT_MASK,
+ port);
+ mutex_unlock(&priv->mm_lock);
+
+ return 0;
+}
+
+static int am65_cpsw_set_mm(struct net_device *ndev, struct ethtool_mm_cfg *cfg,
+ struct netlink_ext_ack *extack)
+{
+ struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
+ struct am65_cpsw_ndev_priv *priv = netdev_priv(ndev);
+ struct am65_cpsw_iet *iet = &port->qos.iet;
+ u32 val, add_frag_size;
+ int err;
+
+ err = ethtool_mm_frag_size_min_to_add(cfg->tx_min_frag_size, &add_frag_size, extack);
+ if (err)
+ return err;
+
+ mutex_lock(&priv->mm_lock);
+
+ if (cfg->pmac_enabled) {
+ /* change TX & RX FIFO MAX_BLKS as per TRM recommendation */
+ if (!iet->original_max_blks)
+ iet->original_max_blks = readl(port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
+
+ writel(AM65_CPSW_PN_TX_RX_MAX_BLKS_IET,
+ port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
+ } else {
+ /* restore RX & TX FIFO MAX_BLKS */
+ if (iet->original_max_blks) {
+ writel(iet->original_max_blks,
+ port->port_base + AM65_CPSW_PN_REG_MAX_BLKS);
+ }
+ }
+
+ am65_cpsw_port_iet_rx_enable(port, cfg->pmac_enabled);
+ am65_cpsw_port_iet_tx_enable(port, cfg->tx_enabled);
+
+ val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ if (cfg->verify_enabled) {
+ val &= ~AM65_CPSW_PN_IET_MAC_DISABLEVERIFY;
+ /* Reset Verify state machine. Verification won't start here.
+ * Verification will be done once link-up.
+ */
+ val |= AM65_CPSW_PN_IET_MAC_LINKFAIL;
+ } else {
+ val |= AM65_CPSW_PN_IET_MAC_DISABLEVERIFY;
+ }
+
+ val &= ~AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK;
+ val |= AM65_CPSW_PN_IET_MAC_SET_ADDFRAGSIZE(add_frag_size);
+ writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+
+ /* verify_timeout_count can only be set at valid link */
+ port->qos.iet.verify_time_ms = cfg->verify_time;
+
+ /* enable/disable pre-emption based on link status */
+ am65_cpsw_iet_commit_preemptible_tcs(port);
+
+ mutex_unlock(&priv->mm_lock);
+
+ return 0;
+}
+
+static void am65_cpsw_get_mm_stats(struct net_device *ndev,
+ struct ethtool_mm_stats *s)
+{
+ struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
+ void __iomem *base = port->stat_base;
+
+ s->MACMergeFrameAssOkCount = readl(base + AM65_CPSW_STATN_IET_RX_ASSEMBLY_OK);
+ s->MACMergeFrameAssErrorCount = readl(base + AM65_CPSW_STATN_IET_RX_ASSEMBLY_ERROR);
+ s->MACMergeFrameSmdErrorCount = readl(base + AM65_CPSW_STATN_IET_RX_SMD_ERROR);
+ s->MACMergeFragCountRx = readl(base + AM65_CPSW_STATN_IET_RX_FRAG);
+ s->MACMergeFragCountTx = readl(base + AM65_CPSW_STATN_IET_TX_FRAG);
+ s->MACMergeHoldCount = readl(base + AM65_CPSW_STATN_IET_TX_HOLD);
+}
+
const struct ethtool_ops am65_cpsw_ethtool_ops_slave = {
.begin = am65_cpsw_ethtool_op_begin,
.complete = am65_cpsw_ethtool_op_complete,
@@ -743,4 +890,7 @@ const struct ethtool_ops am65_cpsw_ethtool_ops_slave = {
.get_eee = am65_cpsw_get_eee,
.set_eee = am65_cpsw_set_eee,
.nway_reset = am65_cpsw_nway_reset,
+ .get_mm = am65_cpsw_get_mm,
+ .set_mm = am65_cpsw_set_mm,
+ .get_mm_stats = am65_cpsw_get_mm_stats,
};
@@ -2161,6 +2161,8 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
ndev_priv = netdev_priv(port->ndev);
ndev_priv->port = port;
ndev_priv->msg_enable = AM65_CPSW_DEBUG;
+ mutex_init(&ndev_priv->mm_lock);
+ port->qos.link_speed = SPEED_UNKNOWN;
SET_NETDEV_DEV(port->ndev, dev);
eth_hw_addr_set(port->ndev, port->slave.mac_addr);
@@ -145,6 +145,7 @@ struct am65_cpsw_common {
bool pf_p0_rx_ptype_rrobin;
struct am65_cpts *cpts;
int est_enabled;
+ bool iet_enabled;
bool is_emac_mode;
u16 br_members;
@@ -170,6 +171,10 @@ struct am65_cpsw_ndev_priv {
struct am65_cpsw_port *port;
struct am65_cpsw_ndev_stats __percpu *stats;
bool offload_fwd_mark;
+ /* Serialize access to MAC Merge state between ethtool requests
+ * and link state updates
+ */
+ struct mutex mm_lock;
};
#define am65_ndev_to_priv(ndev) \
@@ -4,9 +4,11 @@
*
* quality of service module includes:
* Enhanced Scheduler Traffic (EST - P802.1Qbv/D2.2)
+ * Interspersed Express Traffic (IET - P802.3br/D2.0)
*/
#include <linux/pm_runtime.h>
+#include <linux/units.h>
#include <linux/time.h>
#include <net/pkt_cls.h>
@@ -15,50 +17,6 @@
#include "am65-cpts.h"
#include "cpsw_ale.h"
-#define AM65_CPSW_REG_CTL 0x004
-#define AM65_CPSW_P0_REG_TX_PRI_MAP 0x018
-#define AM65_CPSW_P0_REG_RX_PRI_MAP 0x020
-#define AM65_CPSW_P0_REG_FIFO_STATUS 0x050
-#define AM65_CPSW_P0_REG_PRI_CIR(pri) (0x140 + 4 * (pri))
-#define AM65_CPSW_P0_REG_PRI_EIR(pri) (0x160 + 4 * (pri))
-
-#define AM65_CPSW_PN_REG_CTL 0x004
-#define AM65_CPSW_PN_REG_TX_PRI_MAP 0x018
-#define AM65_CPSW_PN_REG_RX_PRI_MAP 0x020
-#define AM65_CPSW_PN_REG_FIFO_STATUS 0x050
-#define AM65_CPSW_PN_REG_EST_CTL 0x060
-#define AM65_CPSW_PN_REG_PRI_CIR(pri) (0x140 + 4 * (pri))
-#define AM65_CPSW_PN_REG_PRI_EIR(pri) (0x160 + 4 * (pri))
-
-/* AM65_CPSW_REG_CTL register fields */
-#define AM65_CPSW_CTL_EST_EN BIT(18)
-
-/* AM65_CPSW_PN_REG_CTL register fields */
-#define AM65_CPSW_PN_CTL_EST_PORT_EN BIT(17)
-
-/* AM65_CPSW_PN_REG_EST_CTL register fields */
-#define AM65_CPSW_PN_EST_ONEBUF BIT(0)
-#define AM65_CPSW_PN_EST_BUFSEL BIT(1)
-#define AM65_CPSW_PN_EST_TS_EN BIT(2)
-#define AM65_CPSW_PN_EST_TS_FIRST BIT(3)
-#define AM65_CPSW_PN_EST_ONEPRI BIT(4)
-#define AM65_CPSW_PN_EST_TS_PRI_MSK GENMASK(7, 5)
-
-/* AM65_CPSW_PN_REG_FIFO_STATUS register fields */
-#define AM65_CPSW_PN_FST_TX_PRI_ACTIVE_MSK GENMASK(7, 0)
-#define AM65_CPSW_PN_FST_TX_E_MAC_ALLOW_MSK GENMASK(15, 8)
-#define AM65_CPSW_PN_FST_EST_CNT_ERR BIT(16)
-#define AM65_CPSW_PN_FST_EST_ADD_ERR BIT(17)
-#define AM65_CPSW_PN_FST_EST_BUFACT BIT(18)
-
-/* EST FETCH COMMAND RAM */
-#define AM65_CPSW_FETCH_RAM_CMD_NUM 0x80
-#define AM65_CPSW_FETCH_CNT_MSK GENMASK(21, 8)
-#define AM65_CPSW_FETCH_CNT_MAX (AM65_CPSW_FETCH_CNT_MSK >> 8)
-#define AM65_CPSW_FETCH_CNT_OFFSET 8
-#define AM65_CPSW_FETCH_ALLOW_MSK GENMASK(7, 0)
-#define AM65_CPSW_FETCH_ALLOW_MAX AM65_CPSW_FETCH_ALLOW_MSK
-
#define TO_MBPS(x) ((x) * 8 / 1000000)
enum timer_act {
@@ -67,10 +25,193 @@ enum timer_act {
TACT_SKIP_PROG, /* just buffer can be updated */
};
-/* number of priority queues per port FIFO */
-#define AM65_CPSW_PN_FIFO_PRIO_NUM 8
-#define AM65_CPSW_PN_TX_PRI_MAP_DEFAULT 0x76543210
+/* IET */
+static int am65_cpsw_iet_set_verify_timeout_count(struct am65_cpsw_port *port)
+{
+ int verify_time_ms = port->qos.iet.verify_time_ms;
+ int link_speed = port->qos.link_speed;
+ u32 val;
+
+ if (WARN_ON(link_speed == SPEED_UNKNOWN))
+ return -ENODEV;
+
+ /* The number of wireside clocks contained in the verify
+ * timeout counter. The default is 0x1312d0
+ * (10ms at 125Mhz in 1G mode).
+ */
+ val = 125 * HZ_PER_MHZ; /* assuming 125MHz wireside clock */
+
+ val /= MILLIHZ_PER_HZ; /* count per ms timeout */
+ val *= verify_time_ms; /* count for timeout ms */
+ if (link_speed < SPEED_1000)
+ val <<= 1; /* FIXME: Is this correct? */
+
+ if (val > AM65_CPSW_PN_MAC_VERIFY_CNT_MASK)
+ return -EINVAL;
+
+ writel(val, port->port_base + AM65_CPSW_PN_REG_IET_VERIFY);
+
+ return 0;
+}
+
+unsigned int am65_cpsw_iet_get_verify_timeout_ms(u32 count, struct am65_cpsw_port *port)
+{
+ int link_speed = port->qos.link_speed;
+ u32 val = 125 * HZ_PER_MHZ; /* assuming 125MHz wireside clock */
+ unsigned int timeout_ms;
+
+ if (link_speed == SPEED_UNKNOWN)
+ link_speed = SPEED_1000;
+
+ val /= MILLIHZ_PER_HZ; /* count per ms timeout */
+
+ timeout_ms = count / val;
+
+ if (link_speed < SPEED_1000)
+ timeout_ms >>= 1; /* FIXME: Is this correct? */
+
+ return timeout_ms;
+}
+
+static int am65_cpsw_iet_verify_wait(struct am65_cpsw_port *port)
+{
+ u32 ctrl, status;
+ int try;
+
+ try = 20;
+ do {
+ /* Clear MAC_LINKFAIL bit to start Verify. */
+ ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ ctrl &= ~AM65_CPSW_PN_IET_MAC_LINKFAIL;
+ writel(ctrl, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+
+ msleep(port->qos.iet.verify_time_ms);
+
+ status = readl(port->port_base + AM65_CPSW_PN_REG_IET_STATUS);
+ if (status & AM65_CPSW_PN_MAC_VERIFIED)
+ return 0;
+
+ if (status & AM65_CPSW_PN_MAC_VERIFY_FAIL) {
+ netdev_dbg(port->ndev,
+ "MAC Merge verify failed, trying again");
+ /* Reset the verify state machine by writing 1
+ * to LINKFAIL
+ */
+ ctrl = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ ctrl |= AM65_CPSW_PN_IET_MAC_LINKFAIL;
+ writel(ctrl, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ continue;
+ }
+
+ if (status & AM65_CPSW_PN_MAC_RESPOND_ERR) {
+ netdev_dbg(port->ndev, "MAC Merge respond error");
+ return -ENODEV;
+ }
+
+ if (status & AM65_CPSW_PN_MAC_VERIFY_ERR) {
+ netdev_dbg(port->ndev, "MAC Merge verify error");
+ return -ENODEV;
+ }
+ } while (try-- > 0);
+
+ netdev_dbg(port->ndev, "MAC Merge verify timeout");
+ return -ETIMEDOUT;
+}
+
+static void am65_cpsw_iet_set_preempt_mask(struct am65_cpsw_port *port, u8 preemptible_tcs)
+{
+ u32 val;
+
+ val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ val &= ~AM65_CPSW_PN_IET_MAC_PREMPT_MASK;
+ val |= AM65_CPSW_PN_IET_MAC_SET_PREEMPT(preemptible_tcs);
+ writel(val, port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+}
+
+/* enable common IET_ENABLE only if at least 1 port has rx IET enabled.
+ * UAPI doesn't allow tx enable without rx enable.
+ */
+void am65_cpsw_iet_common_enable(struct am65_cpsw_common *common)
+{
+ struct am65_cpsw_port *port;
+ bool rx_enable = false;
+ u32 val;
+ int i;
+
+ for (i = 0; i < common->port_num; i++) {
+ port = &common->ports[i];
+ val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
+ rx_enable = !!(val & AM65_CPSW_PN_CTL_IET_PORT_EN);
+ if (rx_enable)
+ break;
+ }
+
+ val = readl(common->cpsw_base + AM65_CPSW_REG_CTL);
+
+ if (rx_enable)
+ val |= AM65_CPSW_CTL_IET_EN;
+ else
+ val &= ~AM65_CPSW_CTL_IET_EN;
+
+ writel(val, common->cpsw_base + AM65_CPSW_REG_CTL);
+ common->iet_enabled = rx_enable;
+}
+
+/* CPSW does not have an IRQ to notify changes to the MAC Merge TX status
+ * (active/inactive), but the preemptible traffic classes should only be
+ * committed to hardware once TX is active. Resort to polling.
+ */
+void am65_cpsw_iet_commit_preemptible_tcs(struct am65_cpsw_port *port)
+{
+ u8 preemptible_tcs = 0;
+ int err;
+ u32 val;
+
+ if (port->qos.link_speed == SPEED_UNKNOWN)
+ return;
+
+ val = readl(port->port_base + AM65_CPSW_PN_REG_CTL);
+ if (!(val & AM65_CPSW_PN_CTL_IET_PORT_EN))
+ return;
+
+ /* update common IET enable */
+ am65_cpsw_iet_common_enable(port->common);
+ /* update verify count */
+ err = am65_cpsw_iet_set_verify_timeout_count(port);
+ if (err) {
+ netdev_err(port->ndev, "couldn't set verify count: %d\n", err);
+ return;
+ }
+
+ val = readl(port->port_base + AM65_CPSW_PN_REG_IET_CTRL);
+ if (!(val & AM65_CPSW_PN_IET_MAC_DISABLEVERIFY)) {
+ err = am65_cpsw_iet_verify_wait(port);
+ if (err)
+ return;
+ }
+
+ preemptible_tcs = port->qos.iet.preemptible_tcs;
+ am65_cpsw_iet_set_preempt_mask(port, preemptible_tcs);
+}
+
+static void am65_cpsw_iet_change_preemptible_tcs(struct am65_cpsw_port *port, u8 preemptible_tcs)
+{
+ port->qos.iet.preemptible_tcs = preemptible_tcs;
+ am65_cpsw_iet_commit_preemptible_tcs(port);
+}
+
+static void am65_cpsw_iet_link_state_update(struct net_device *ndev)
+{
+ struct am65_cpsw_ndev_priv *priv = am65_ndev_to_priv(ndev);
+ struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
+
+ mutex_lock(&priv->mm_lock);
+ am65_cpsw_iet_commit_preemptible_tcs(port);
+ mutex_unlock(&priv->mm_lock);
+}
+
+/* EST */
static int am65_cpsw_port_est_enabled(struct am65_cpsw_port *port)
{
return port->qos.est_oper || port->qos.est_admin;
@@ -602,6 +743,8 @@ static int am65_cpsw_setup_taprio(struct net_device *ndev, void *type_data)
if (port->qos.link_speed == SPEED_UNKNOWN)
return -ENOLINK;
+ am65_cpsw_iet_change_preemptible_tcs(port, taprio->mqprio.preemptible_tcs);
+
return am65_cpsw_set_taprio(ndev, type_data);
}
@@ -1143,6 +1286,7 @@ static int am65_cpsw_setup_mqprio(struct net_device *ndev, void *type_data)
port->port_base + AM65_CPSW_PN_REG_TX_PRI_MAP);
am65_cpsw_tx_pn_shaper_apply(port);
+ am65_cpsw_iet_change_preemptible_tcs(port, mqprio->preemptible_tcs);
exit_put:
pm_runtime_put(common->dev);
@@ -1172,6 +1316,7 @@ void am65_cpsw_qos_link_up(struct net_device *ndev, int link_speed)
port->qos.link_speed = link_speed;
am65_cpsw_tx_pn_shaper_apply(port);
+ am65_cpsw_iet_link_state_update(ndev);
if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS))
return;
@@ -1186,6 +1331,7 @@ void am65_cpsw_qos_link_down(struct net_device *ndev)
port->qos.link_speed = SPEED_UNKNOWN;
am65_cpsw_tx_pn_shaper_apply(port);
+ am65_cpsw_iet_link_state_update(ndev);
if (!IS_ENABLED(CONFIG_TI_AM65_CPSW_TAS))
return;
@@ -23,6 +23,12 @@ struct am65_cpsw_mqprio {
bool shaper_en;
};
+struct am65_cpsw_iet {
+ u8 preemptible_tcs;
+ u32 original_max_blks;
+ int verify_time_ms;
+};
+
struct am65_cpsw_ale_ratelimit {
unsigned long cookie;
u64 rate_packet_ps;
@@ -34,6 +40,7 @@ struct am65_cpsw_qos {
ktime_t link_down_time;
int link_speed;
struct am65_cpsw_mqprio mqprio;
+ struct am65_cpsw_iet iet;
struct am65_cpsw_ale_ratelimit ale_bc_ratelimit;
struct am65_cpsw_ale_ratelimit ale_mc_ratelimit;
@@ -46,4 +53,101 @@ void am65_cpsw_qos_link_down(struct net_device *ndev);
int am65_cpsw_qos_ndo_tx_p0_set_maxrate(struct net_device *ndev, int queue, u32 rate_mbps);
void am65_cpsw_qos_tx_p0_rate_init(struct am65_cpsw_common *common);
+void am65_cpsw_iet_commit_preemptible_tcs(struct am65_cpsw_port *port);
+unsigned int am65_cpsw_iet_get_verify_timeout_ms(u32 count, struct am65_cpsw_port *port);
+void am65_cpsw_iet_common_enable(struct am65_cpsw_common *common);
+
+#define AM65_CPSW_REG_CTL 0x004
+#define AM65_CPSW_PN_REG_CTL 0x004
+#define AM65_CPSW_PN_REG_MAX_BLKS 0x008
+#define AM65_CPSW_PN_REG_TX_PRI_MAP 0x018
+#define AM65_CPSW_PN_REG_RX_PRI_MAP 0x020
+#define AM65_CPSW_PN_REG_IET_CTRL 0x040
+#define AM65_CPSW_PN_REG_IET_STATUS 0x044
+#define AM65_CPSW_PN_REG_IET_VERIFY 0x048
+#define AM65_CPSW_PN_REG_FIFO_STATUS 0x050
+#define AM65_CPSW_PN_REG_EST_CTL 0x060
+#define AM65_CPSW_PN_REG_PRI_CIR(pri) (0x140 + 4 * (pri))
+#define AM65_CPSW_PN_REG_PRI_EIR(pri) (0x160 + 4 * (pri))
+
+/* AM65_CPSW_REG_CTL register fields */
+#define AM65_CPSW_CTL_IET_EN BIT(17)
+#define AM65_CPSW_CTL_EST_EN BIT(18)
+
+/* AM65_CPSW_PN_REG_CTL register fields */
+#define AM65_CPSW_PN_CTL_IET_PORT_EN BIT(16)
+#define AM65_CPSW_PN_CTL_EST_PORT_EN BIT(17)
+
+/* AM65_CPSW_PN_REG_EST_CTL register fields */
+#define AM65_CPSW_PN_EST_ONEBUF BIT(0)
+#define AM65_CPSW_PN_EST_BUFSEL BIT(1)
+#define AM65_CPSW_PN_EST_TS_EN BIT(2)
+#define AM65_CPSW_PN_EST_TS_FIRST BIT(3)
+#define AM65_CPSW_PN_EST_ONEPRI BIT(4)
+#define AM65_CPSW_PN_EST_TS_PRI_MSK GENMASK(7, 5)
+
+/* AM65_CPSW_PN_REG_IET_CTRL register fields */
+#define AM65_CPSW_PN_IET_MAC_PENABLE BIT(0)
+#define AM65_CPSW_PN_IET_MAC_DISABLEVERIFY BIT(2)
+#define AM65_CPSW_PN_IET_MAC_LINKFAIL BIT(3)
+#define AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK GENMASK(10, 8)
+#define AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_OFFSET 8
+#define AM65_CPSW_PN_IET_MAC_PREMPT_MASK GENMASK(23, 16)
+#define AM65_CPSW_PN_IET_MAC_PREMPT_OFFSET 16
+
+#define AM65_CPSW_PN_IET_MAC_SET_ADDFRAGSIZE(n) (((n) << AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_OFFSET) & \
+ AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK)
+#define AM65_CPSW_PN_IET_MAC_GET_ADDFRAGSIZE(n) (((n) & AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_MASK) >> \
+ AM65_CPSW_PN_IET_MAC_MAC_ADDFRAGSIZE_OFFSET)
+#define AM65_CPSW_PN_IET_MAC_SET_PREEMPT(n) (((n) << AM65_CPSW_PN_IET_MAC_PREMPT_OFFSET) & \
+ AM65_CPSW_PN_IET_MAC_PREMPT_MASK)
+#define AM65_CPSW_PN_IET_MAC_GET_PREEMPT(n) (((n) & AM65_CPSW_PN_IET_MAC_PREMPT_MASK) >> \
+ AM65_CPSW_PN_IET_MAC_PREMPT_OFFSET)
+
+/* AM65_CPSW_PN_REG_IET_STATUS register fields */
+#define AM65_CPSW_PN_MAC_STATUS GENMASK(3, 0)
+#define AM65_CPSW_PN_MAC_VERIFIED BIT(0)
+#define AM65_CPSW_PN_MAC_VERIFY_FAIL BIT(1)
+#define AM65_CPSW_PN_MAC_RESPOND_ERR BIT(2)
+#define AM65_CPSW_PN_MAC_VERIFY_ERR BIT(3)
+
+/* AM65_CPSW_PN_REG_IET_VERIFY register fields */
+#define AM65_CPSW_PN_MAC_VERIFY_CNT_MASK GENMASK(23, 0)
+#define AM65_CPSW_PN_MAC_GET_VERIFY_CNT(n) ((n) & AM65_CPSW_PN_MAC_VERIFY_CNT_MASK)
+/* 10 msec converted to NSEC */
+#define AM65_CPSW_IET_VERIFY_CNT_MS (10)
+#define AM65_CPSW_IET_VERIFY_CNT_NS (AM65_CPSW_IET_VERIFY_CNT_MS * \
+ NSEC_PER_MSEC)
+
+/* AM65_CPSW_PN_REG_FIFO_STATUS register fields */
+#define AM65_CPSW_PN_FST_TX_PRI_ACTIVE_MSK GENMASK(7, 0)
+#define AM65_CPSW_PN_FST_TX_E_MAC_ALLOW_MSK GENMASK(15, 8)
+#define AM65_CPSW_PN_FST_EST_CNT_ERR BIT(16)
+#define AM65_CPSW_PN_FST_EST_ADD_ERR BIT(17)
+#define AM65_CPSW_PN_FST_EST_BUFACT BIT(18)
+
+/* EST FETCH COMMAND RAM */
+#define AM65_CPSW_FETCH_RAM_CMD_NUM 0x80
+#define AM65_CPSW_FETCH_CNT_MSK GENMASK(21, 8)
+#define AM65_CPSW_FETCH_CNT_MAX (AM65_CPSW_FETCH_CNT_MSK >> 8)
+#define AM65_CPSW_FETCH_CNT_OFFSET 8
+#define AM65_CPSW_FETCH_ALLOW_MSK GENMASK(7, 0)
+#define AM65_CPSW_FETCH_ALLOW_MAX AM65_CPSW_FETCH_ALLOW_MSK
+
+/* AM65_CPSW_PN_REG_MAX_BLKS fields for IET and No IET cases */
+/* 7 blocks for pn_rx_max_blks, 13 for pn_tx_max_blks*/
+#define AM65_CPSW_PN_TX_RX_MAX_BLKS_IET 0xD07
+
+/* Slave IET Stats. register offsets */
+#define AM65_CPSW_STATN_IET_RX_ASSEMBLY_ERROR 0x140
+#define AM65_CPSW_STATN_IET_RX_ASSEMBLY_OK 0x144
+#define AM65_CPSW_STATN_IET_RX_SMD_ERROR 0x148
+#define AM65_CPSW_STATN_IET_RX_FRAG 0x14c
+#define AM65_CPSW_STATN_IET_TX_HOLD 0x150
+#define AM65_CPSW_STATN_IET_TX_FRAG 0x154
+
+/* number of priority queues per port FIFO */
+#define AM65_CPSW_PN_FIFO_PRIO_NUM 8
+#define AM65_CPSW_PN_TX_PRI_MAP_DEFAULT 0x76543210
+
#endif /* AM65_CPSW_QOS_H_ */