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Date: Thu, 11 Aug 2016 13:02:36 +0100
From: Bert Kenward <bkenward@...arflare.com>
To: Dave Miller <davem@...emloft.net>
CC: <netdev@...r.kernel.org>,
linux-net-drivers <linux-net-drivers@...arflare.com>
Subject: [PATCH net-next 6/6] sfc: get timer configuration from adapter
On SFN8000 series adapters the MC provides a method to get the timer
quantum and the maximum timer setting. We revert to the old values if the
new call is unavailable.
Signed-off-by: Bert Kenward <bkenward@...arflare.com>
---
drivers/net/ethernet/sfc/ef10.c | 142 +++++++++++++++++++++++++++-------
drivers/net/ethernet/sfc/efx.c | 9 ++-
drivers/net/ethernet/sfc/falcon.c | 2 +
drivers/net/ethernet/sfc/net_driver.h | 2 +
drivers/net/ethernet/sfc/siena.c | 3 +
5 files changed, 125 insertions(+), 33 deletions(-)
diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c
index 5f6c4fa..b8c9f18 100644
--- a/drivers/net/ethernet/sfc/ef10.c
+++ b/drivers/net/ethernet/sfc/ef10.c
@@ -233,6 +233,116 @@ static int efx_ef10_get_sysclk_freq(struct efx_nic *efx)
return rc > 0 ? rc : -ERANGE;
}
+static int efx_ef10_get_timer_workarounds(struct efx_nic *efx)
+{
+ struct efx_ef10_nic_data *nic_data = efx->nic_data;
+ unsigned int implemented;
+ unsigned int enabled;
+ int rc;
+
+ nic_data->workaround_35388 = false;
+ nic_data->workaround_61265 = false;
+
+ rc = efx_mcdi_get_workarounds(efx, &implemented, &enabled);
+
+ if (rc == -ENOSYS) {
+ /* Firmware without GET_WORKAROUNDS - not a problem. */
+ rc = 0;
+ } else if (rc == 0) {
+ /* Bug61265 workaround is always enabled if implemented. */
+ if (enabled & MC_CMD_GET_WORKAROUNDS_OUT_BUG61265)
+ nic_data->workaround_61265 = true;
+
+ if (enabled & MC_CMD_GET_WORKAROUNDS_OUT_BUG35388) {
+ nic_data->workaround_35388 = true;
+ } else if (implemented & MC_CMD_GET_WORKAROUNDS_OUT_BUG35388) {
+ /* Workaround is implemented but not enabled.
+ * Try to enable it.
+ */
+ rc = efx_mcdi_set_workaround(efx,
+ MC_CMD_WORKAROUND_BUG35388,
+ true, NULL);
+ if (rc == 0)
+ nic_data->workaround_35388 = true;
+ /* If we failed to set the workaround just carry on. */
+ rc = 0;
+ }
+ }
+
+ netif_dbg(efx, probe, efx->net_dev,
+ "workaround for bug 35388 is %sabled\n",
+ nic_data->workaround_35388 ? "en" : "dis");
+ netif_dbg(efx, probe, efx->net_dev,
+ "workaround for bug 61265 is %sabled\n",
+ nic_data->workaround_61265 ? "en" : "dis");
+
+ return rc;
+}
+
+static void efx_ef10_process_timer_config(struct efx_nic *efx,
+ const efx_dword_t *data)
+{
+ unsigned int max_count;
+
+ if (EFX_EF10_WORKAROUND_61265(efx)) {
+ efx->timer_quantum_ns = MCDI_DWORD(data,
+ GET_EVQ_TMR_PROPERTIES_OUT_MCDI_TMR_STEP_NS);
+ efx->timer_max_ns = MCDI_DWORD(data,
+ GET_EVQ_TMR_PROPERTIES_OUT_MCDI_TMR_MAX_NS);
+ } else if (EFX_EF10_WORKAROUND_35388(efx)) {
+ efx->timer_quantum_ns = MCDI_DWORD(data,
+ GET_EVQ_TMR_PROPERTIES_OUT_BUG35388_TMR_NS_PER_COUNT);
+ max_count = MCDI_DWORD(data,
+ GET_EVQ_TMR_PROPERTIES_OUT_BUG35388_TMR_MAX_COUNT);
+ efx->timer_max_ns = max_count * efx->timer_quantum_ns;
+ } else {
+ efx->timer_quantum_ns = MCDI_DWORD(data,
+ GET_EVQ_TMR_PROPERTIES_OUT_TMR_REG_NS_PER_COUNT);
+ max_count = MCDI_DWORD(data,
+ GET_EVQ_TMR_PROPERTIES_OUT_TMR_REG_MAX_COUNT);
+ efx->timer_max_ns = max_count * efx->timer_quantum_ns;
+ }
+
+ netif_dbg(efx, probe, efx->net_dev,
+ "got timer properties from MC: quantum %u ns; max %u ns\n",
+ efx->timer_quantum_ns, efx->timer_max_ns);
+}
+
+static int efx_ef10_get_timer_config(struct efx_nic *efx)
+{
+ MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_EVQ_TMR_PROPERTIES_OUT_LEN);
+ int rc;
+
+ rc = efx_ef10_get_timer_workarounds(efx);
+ if (rc)
+ return rc;
+
+ rc = efx_mcdi_rpc_quiet(efx, MC_CMD_GET_EVQ_TMR_PROPERTIES, NULL, 0,
+ outbuf, sizeof(outbuf), NULL);
+
+ if (rc == 0) {
+ efx_ef10_process_timer_config(efx, outbuf);
+ } else if (rc == -ENOSYS || rc == -EPERM) {
+ /* Not available - fall back to Huntington defaults. */
+ unsigned int quantum;
+
+ rc = efx_ef10_get_sysclk_freq(efx);
+ if (rc < 0)
+ return rc;
+
+ quantum = 1536000 / rc; /* 1536 cycles */
+ efx->timer_quantum_ns = quantum;
+ efx->timer_max_ns = efx->type->timer_period_max * quantum;
+ rc = 0;
+ } else {
+ efx_mcdi_display_error(efx, MC_CMD_GET_EVQ_TMR_PROPERTIES,
+ MC_CMD_GET_EVQ_TMR_PROPERTIES_OUT_LEN,
+ NULL, 0, rc);
+ }
+
+ return rc;
+}
+
static int efx_ef10_get_mac_address_pf(struct efx_nic *efx, u8 *mac_address)
{
MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_MAC_ADDRESSES_OUT_LEN);
@@ -533,33 +643,11 @@ static int efx_ef10_probe(struct efx_nic *efx)
if (rc)
goto fail5;
- rc = efx_ef10_get_sysclk_freq(efx);
+ rc = efx_ef10_get_timer_config(efx);
if (rc < 0)
goto fail5;
efx->timer_quantum_ns = 1536000 / rc; /* 1536 cycles */
- /* Check whether firmware supports bug 35388 workaround.
- * First try to enable it, then if we get EPERM, just
- * ask if it's already enabled
- */
- rc = efx_mcdi_set_workaround(efx, MC_CMD_WORKAROUND_BUG35388, true, NULL);
- if (rc == 0) {
- nic_data->workaround_35388 = true;
- } else if (rc == -EPERM) {
- unsigned int enabled;
-
- rc = efx_mcdi_get_workarounds(efx, NULL, &enabled);
- if (rc)
- goto fail3;
- nic_data->workaround_35388 = enabled &
- MC_CMD_GET_WORKAROUNDS_OUT_BUG35388;
- } else if (rc != -ENOSYS && rc != -ENOENT) {
- goto fail5;
- }
- netif_dbg(efx, probe, efx->net_dev,
- "workaround for bug 35388 is %sabled\n",
- nic_data->workaround_35388 ? "en" : "dis");
-
rc = efx_mcdi_mon_probe(efx);
if (rc && rc != -EPERM)
goto fail5;
@@ -2631,11 +2719,10 @@ static int efx_ef10_ev_init(struct efx_channel *channel)
/* Successfully created event queue on channel 0 */
rc = efx_mcdi_get_workarounds(efx, &implemented, &enabled);
if (rc == -ENOSYS) {
- /* GET_WORKAROUNDS was implemented before these workarounds,
- * thus they must be unavailable in this firmware.
+ /* GET_WORKAROUNDS was implemented before this workaround,
+ * thus it must be unavailable in this firmware.
*/
nic_data->workaround_26807 = false;
- nic_data->workaround_61265 = false;
rc = 0;
} else if (rc) {
goto fail;
@@ -2675,9 +2762,6 @@ static int efx_ef10_ev_init(struct efx_channel *channel)
rc = 0;
}
}
-
- nic_data->workaround_61265 =
- !!(implemented & MC_CMD_GET_WORKAROUNDS_OUT_BUG61265);
}
if (!rc)
diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index b26e1f9..f3826ae 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -1979,12 +1979,13 @@ int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
bool rx_may_override_tx)
{
struct efx_channel *channel;
- unsigned int irq_mod_max = DIV_ROUND_UP(efx->type->timer_period_max *
- efx->timer_quantum_ns,
- 1000);
+ unsigned int timer_max_us;
+
EFX_ASSERT_RESET_SERIALISED(efx);
- if (tx_usecs > irq_mod_max || rx_usecs > irq_mod_max)
+ timer_max_us = efx->timer_max_ns / 1000;
+
+ if (tx_usecs > timer_max_us || rx_usecs > timer_max_us)
return -EINVAL;
if (tx_usecs != rx_usecs && efx->tx_channel_offset == 0 &&
diff --git a/drivers/net/ethernet/sfc/falcon.c b/drivers/net/ethernet/sfc/falcon.c
index d3d0bcc..1a70926 100644
--- a/drivers/net/ethernet/sfc/falcon.c
+++ b/drivers/net/ethernet/sfc/falcon.c
@@ -2376,6 +2376,8 @@ static int falcon_probe_nic(struct efx_nic *efx)
EFX_MAX_CHANNELS);
efx->max_tx_channels = efx->max_channels;
efx->timer_quantum_ns = 4968; /* 621 cycles */
+ efx->timer_max_ns = efx->type->timer_period_max *
+ efx->timer_quantum_ns;
/* Initialise I2C adapter */
board = falcon_board(efx);
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 3e8c6fb..13b7f52 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -810,6 +810,7 @@ struct vfdi_status;
* @membase: Memory BAR value
* @interrupt_mode: Interrupt mode
* @timer_quantum_ns: Interrupt timer quantum, in nanoseconds
+ * @timer_max_ns: Interrupt timer maximum value, in nanoseconds
* @irq_rx_adaptive: Adaptive IRQ moderation enabled for RX event queues
* @irq_rx_mod_step_us: Step size for IRQ moderation for RX event queues
* @irq_rx_moderation_us: IRQ moderation time for RX event queues
@@ -941,6 +942,7 @@ struct efx_nic {
enum efx_int_mode interrupt_mode;
unsigned int timer_quantum_ns;
+ unsigned int timer_max_ns;
bool irq_rx_adaptive;
unsigned int irq_mod_step_us;
unsigned int irq_rx_moderation_us;
diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c
index 994e33f..04ed1b4 100644
--- a/drivers/net/ethernet/sfc/siena.c
+++ b/drivers/net/ethernet/sfc/siena.c
@@ -227,6 +227,9 @@ static int siena_probe_nvconfig(struct efx_nic *efx)
efx->timer_quantum_ns =
(caps & (1 << MC_CMD_CAPABILITIES_TURBO_ACTIVE_LBN)) ?
3072 : 6144; /* 768 cycles */
+ efx->timer_max_ns = efx->type->timer_period_max *
+ efx->timer_quantum_ns;
+
return rc;
}
--
2.7.4
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