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Date: Tue, 1 Dec 2020 20:53:22 -0800
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: netdev@...r.kernel.org
Cc: Vinicius Costa Gomes <vinicius.gomes@...el.com>, jhs@...atatu.com,
xiyou.wangcong@...il.com, jiri@...nulli.us, kuba@...nel.org,
m-karicheri2@...com, vladimir.oltean@....com,
Jose.Abreu@...opsys.com, po.liu@....com,
intel-wired-lan@...ts.osuosl.org, anthony.l.nguyen@...el.com
Subject: [PATCH net-next v1 6/9] igc: Add support for tuning frame preemption via ethtool
The tc subsystem sets which queues are marked as preemptible, it's the
role of ethtool to control more hardware specific parameters. These
parameters include:
- enabling the frame preemption hardware: As enabling frame
preemption may have other requirements before it can be enabled, it's
exposed via the ethtool API;
- mininum fragment size multiplier: expressed in usually in the form
of (1 + N)*64, this number indicates what's the size of the minimum
fragment that can be preempted.
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
drivers/net/ethernet/intel/igc/igc.h | 10 ++++
drivers/net/ethernet/intel/igc/igc_defines.h | 4 ++
drivers/net/ethernet/intel/igc/igc_ethtool.c | 55 ++++++++++++++++++++
drivers/net/ethernet/intel/igc/igc_tsn.c | 20 +++++--
4 files changed, 86 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index 35baae900c1f..35c2dc4ad810 100644
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -87,6 +87,7 @@ struct igc_ring {
u8 queue_index; /* logical index of the ring*/
u8 reg_idx; /* physical index of the ring */
bool launchtime_enable; /* true if LaunchTime is enabled */
+ bool preemptible; /* true if not express */
u32 start_time;
u32 end_time;
@@ -165,6 +166,11 @@ struct igc_adapter {
ktime_t base_time;
ktime_t cycle_time;
+ bool frame_preemption_active;
+ /* Frame preemption minimum fragment size, this the X in
+ * (1 + X)*64 + 4
+ */
+ u8 min_frag_size_mult;
/* OS defined structs */
struct pci_dev *pdev;
@@ -262,6 +268,10 @@ extern char igc_driver_name[];
#define IGC_FLAG_VLAN_PROMISC BIT(15)
#define IGC_FLAG_RX_LEGACY BIT(16)
#define IGC_FLAG_TSN_QBV_ENABLED BIT(17)
+#define IGC_FLAG_TSN_PREEMPT_ENABLED BIT(18)
+
+#define IGC_FLAG_TSN_ANY_ENABLED \
+ (IGC_FLAG_TSN_QBV_ENABLED | IGC_FLAG_TSN_PREEMPT_ENABLED)
#define IGC_FLAG_RSS_FIELD_IPV4_UDP BIT(6)
#define IGC_FLAG_RSS_FIELD_IPV6_UDP BIT(7)
diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index 0e78abfd99ee..c2155d109bd6 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -410,10 +410,14 @@
/* Transmit Scheduling */
#define IGC_TQAVCTRL_TRANSMIT_MODE_TSN 0x00000001
#define IGC_TQAVCTRL_ENHANCED_QAV 0x00000008
+#define IGC_TQAVCTRL_PREEMPT_ENA 0x00000002
+#define IGC_TQAVCTRL_MIN_FRAG_MASK 0x0000C000
+#define IGC_TQAVCTRL_MIN_FRAG_SHIFT 14
#define IGC_TXQCTL_QUEUE_MODE_LAUNCHT 0x00000001
#define IGC_TXQCTL_STRICT_CYCLE 0x00000002
#define IGC_TXQCTL_STRICT_END 0x00000004
+#define IGC_TXQCTL_PREEMPTABLE 0x00000008
/* Receive Checksum Control */
#define IGC_RXCSUM_CRCOFL 0x00000800 /* CRC32 offload enable */
diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 61d331ce38cd..492c6592c150 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -8,6 +8,7 @@
#include "igc.h"
#include "igc_diag.h"
+#include "igc_tsn.h"
/* forward declaration */
struct igc_stats {
@@ -1636,6 +1637,58 @@ static int igc_ethtool_set_eee(struct net_device *netdev,
return 0;
}
+static int igc_ethtool_get_preempt(struct net_device *netdev,
+ struct ethtool_fp *fpcmd)
+{
+ struct igc_adapter *adapter = netdev_priv(netdev);
+
+ fpcmd->enabled = adapter->frame_preemption_active;
+ fpcmd->min_frag_size_mult = adapter->min_frag_size_mult;
+
+ return 0;
+}
+
+static int igc_ethtool_set_preempt(struct net_device *netdev,
+ struct ethtool_fp *fpcmd)
+{
+ struct igc_adapter *adapter = netdev_priv(netdev);
+ int i;
+
+ /* The formula is (Section 8.12.4 of the datasheet):
+ * MIN_FRAG_SIZE = 4 + (1 + MIN_FRAG)*64
+ * MIN_FRAG is represented by two bits, so we can only have
+ * min_frag_size between 68 and 260.
+ */
+ if (fpcmd->min_frag_size_mult > 3)
+ return -EINVAL;
+
+ adapter->frame_preemption_active = fpcmd->enabled;
+ adapter->min_frag_size_mult = fpcmd->min_frag_size_mult;
+
+ if (!adapter->frame_preemption_active)
+ goto done;
+
+ /* Enabling frame preemption requires TSN mode to be enabled,
+ * which requires a schedule to be active. So, if there isn't
+ * a schedule already configured, configure a simple one, with
+ * all queues open, with 1ms cycle time.
+ */
+ if (adapter->base_time)
+ goto done;
+
+ adapter->cycle_time = NSEC_PER_MSEC;
+
+ for (i = 0; i < adapter->num_tx_queues; i++) {
+ struct igc_ring *ring = adapter->tx_ring[i];
+
+ ring->start_time = 0;
+ ring->end_time = NSEC_PER_MSEC;
+ }
+
+done:
+ return igc_tsn_offload_apply(adapter);
+}
+
static int igc_ethtool_begin(struct net_device *netdev)
{
struct igc_adapter *adapter = netdev_priv(netdev);
@@ -1915,6 +1968,8 @@ static const struct ethtool_ops igc_ethtool_ops = {
.get_ts_info = igc_ethtool_get_ts_info,
.get_channels = igc_ethtool_get_channels,
.set_channels = igc_ethtool_set_channels,
+ .get_preempt = igc_ethtool_get_preempt,
+ .set_preempt = igc_ethtool_set_preempt,
.get_priv_flags = igc_ethtool_get_priv_flags,
.set_priv_flags = igc_ethtool_set_priv_flags,
.get_eee = igc_ethtool_get_eee,
diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.c b/drivers/net/ethernet/intel/igc/igc_tsn.c
index f5a5527adb21..76272f62bb69 100644
--- a/drivers/net/ethernet/intel/igc/igc_tsn.c
+++ b/drivers/net/ethernet/intel/igc/igc_tsn.c
@@ -31,6 +31,7 @@ static int igc_tsn_disable_offload(struct igc_adapter *adapter)
return 0;
adapter->cycle_time = 0;
+ adapter->frame_preemption_active = false;
wr32(IGC_TXPBS, I225_TXPBSIZE_DEFAULT);
wr32(IGC_DTXMXPKTSZ, IGC_DTXMXPKTSZ_DEFAULT);
@@ -42,7 +43,8 @@ static int igc_tsn_disable_offload(struct igc_adapter *adapter)
tqavctrl = rd32(IGC_TQAVCTRL);
tqavctrl &= ~(IGC_TQAVCTRL_TRANSMIT_MODE_TSN |
- IGC_TQAVCTRL_ENHANCED_QAV);
+ IGC_TQAVCTRL_ENHANCED_QAV | IGC_TQAVCTRL_PREEMPT_ENA |
+ IGC_TQAVCTRL_MIN_FRAG_MASK);
wr32(IGC_TQAVCTRL, tqavctrl);
for (i = 0; i < adapter->num_tx_queues; i++) {
@@ -51,6 +53,7 @@ static int igc_tsn_disable_offload(struct igc_adapter *adapter)
ring->start_time = 0;
ring->end_time = 0;
ring->launchtime_enable = false;
+ ring->preemptible = false;
wr32(IGC_TXQCTL(i), 0);
wr32(IGC_STQT(i), 0);
@@ -83,13 +86,20 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
wr32(IGC_DTXMXPKTSZ, IGC_DTXMXPKTSZ_TSN);
wr32(IGC_TXPBS, IGC_TXPBSIZE_TSN);
- tqavctrl = rd32(IGC_TQAVCTRL);
rxpbs = rd32(IGC_RXPBS) & ~IGC_RXPBSIZE_SIZE_MASK;
rxpbs |= IGC_RXPBSIZE_TSN;
wr32(IGC_RXPBS, rxpbs);
+ tqavctrl = rd32(IGC_TQAVCTRL) &
+ ~(IGC_TQAVCTRL_MIN_FRAG_MASK | IGC_TQAVCTRL_PREEMPT_ENA);
tqavctrl |= IGC_TQAVCTRL_TRANSMIT_MODE_TSN | IGC_TQAVCTRL_ENHANCED_QAV;
+
+ if (adapter->frame_preemption_active)
+ tqavctrl |= IGC_TQAVCTRL_PREEMPT_ENA;
+
+ tqavctrl |= adapter->min_frag_size_mult << IGC_TQAVCTRL_MIN_FRAG_SHIFT;
+
wr32(IGC_TQAVCTRL, tqavctrl);
wr32(IGC_QBVCYCLET_S, cycle);
@@ -115,6 +125,9 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
if (ring->launchtime_enable)
txqctl |= IGC_TXQCTL_QUEUE_MODE_LAUNCHT;
+ if (ring->preemptible)
+ txqctl |= IGC_TXQCTL_PREEMPTABLE;
+
wr32(IGC_TXQCTL(i), txqctl);
}
@@ -142,7 +155,8 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
int igc_tsn_offload_apply(struct igc_adapter *adapter)
{
- bool is_any_enabled = adapter->base_time || is_any_launchtime(adapter);
+ bool is_any_enabled = adapter->base_time ||
+ is_any_launchtime(adapter) || adapter->frame_preemption_active;
if (!(adapter->flags & IGC_FLAG_TSN_QBV_ENABLED) && !is_any_enabled)
return 0;
--
2.29.2
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