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Message-Id: <1509947098-10148-12-git-send-email-andy@greyhouse.net>
Date: Mon, 6 Nov 2017 00:44:57 -0500
From: Andy Gospodarek <andy@...yhouse.net>
To: netdev@...r.kernel.org
Cc: mchan@...adcom.com, saeedm@...lanox.com,
Andy Gospodarek <gospo@...adcom.com>
Subject: [RFC 8/9] net: move adaptive interrpt coalescing code to lib/
From: Andy Gospodarek <gospo@...adcom.com>
This takes the code that is not generically named to lib/.
This move allows drivers to add private structure elements to track the
number of packets, bytes, and interrupts events per ring. A driver
also defines a workqueue handler to act on this collected data once per
poll and modify the coalecing paramets per ring.
Signed-off-by: Andy Gospodarek <gospo@...adcom.com>
---
drivers/net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en.h | 2 +-
drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c | 1 +
.../net/ethernet/mellanox/mlx5/core/net_rx_am.c | 303 --------------------
.../net/ethernet/mellanox/mlx5/core/net_rx_am.h | 107 -------
include/linux/net_rx_am.h | 109 ++++++++
lib/Makefile | 2 +-
lib/net_rx_am.c | 306 +++++++++++++++++++++
8 files changed, 419 insertions(+), 413 deletions(-)
delete mode 100644 drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.c
delete mode 100644 drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.h
create mode 100644 include/linux/net_rx_am.h
create mode 100644 lib/net_rx_am.c
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index d5d6d3d..19b21b4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -15,7 +15,7 @@ mlx5_core-$(CONFIG_MLX5_FPGA) += fpga/cmd.o fpga/core.o fpga/conn.o fpga/sdk.o \
mlx5_core-$(CONFIG_MLX5_CORE_EN) += en_main.o en_common.o en_fs.o en_ethtool.o \
en_tx.o en_rx.o en_rx_am.o en_txrx.o en_stats.o vxlan.o \
- en_arfs.o en_fs_ethtool.o en_selftest.o net_rx_am.o
+ en_arfs.o en_fs_ethtool.o en_selftest.o
mlx5_core-$(CONFIG_MLX5_MPFS) += lib/mpfs.o
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 203dc7b..04b36fe 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -49,7 +49,7 @@
#include "wq.h"
#include "mlx5_core.h"
#include "en_stats.h"
-#include "net_rx_am.h"
+#include <linux/net_rx_am.h>
#define MLX5_SET_CFG(p, f, v) MLX5_SET(create_flow_group_in, p, f, v)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
index 1f8fda1..391f1ba 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
@@ -31,6 +31,7 @@
*/
#include "en.h"
+#include <linux/net_rx_am.h>
void mlx5e_rx_am_work(struct work_struct *work)
{
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.c b/drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.c
deleted file mode 100644
index 37ea6d1..0000000
--- a/drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.c
+++ /dev/null
@@ -1,303 +0,0 @@
-/*
- * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
- * Copyright (c) 2017, Broadcom Limiited. All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses. You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials
- * provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include "en.h"
-
-#define NET_PARAMS_AM_NUM_PROFILES 5
-/* Adaptive moderation profiles */
-#define NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256
-#define NET_RX_AM_DEF_PROFILE_CQE 1
-#define NET_RX_AM_DEF_PROFILE_EQE 1
-
-/* All profiles sizes must be NET_PARAMS_AM_NUM_PROFILES */
-#define NET_AM_EQE_PROFILES { \
- {1, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
- {8, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
- {64, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
- {128, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
- {256, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
-}
-
-#define NET_AM_CQE_PROFILES { \
- {2, 256}, \
- {8, 128}, \
- {16, 64}, \
- {32, 64}, \
- {64, 64} \
-}
-
-static const struct net_cq_moder
-profile[NET_CQ_PERIOD_NUM_MODES][NET_PARAMS_AM_NUM_PROFILES] = {
- NET_AM_EQE_PROFILES,
- NET_AM_CQE_PROFILES,
-};
-
-struct net_cq_moder net_am_get_profile(u8 cq_period_mode, int ix)
-{
- return profile[cq_period_mode][ix];
-}
-
-struct net_cq_moder net_am_get_def_profile(u8 rx_cq_period_mode)
-{
- int default_profile_ix;
-
- if (rx_cq_period_mode == NET_CQ_PERIOD_MODE_START_FROM_CQE)
- default_profile_ix = NET_RX_AM_DEF_PROFILE_CQE;
- else /* NET_CQ_PERIOD_MODE_START_FROM_EQE */
- default_profile_ix = NET_RX_AM_DEF_PROFILE_EQE;
-
- return profile[rx_cq_period_mode][default_profile_ix];
-}
-
-static bool net_am_on_top(struct net_rx_am *am)
-{
- switch (am->tune_state) {
- case NET_AM_PARKING_ON_TOP:
- case NET_AM_PARKING_TIRED:
- return true;
- case NET_AM_GOING_RIGHT:
- return (am->steps_left > 1) && (am->steps_right == 1);
- default: /* NET_AM_GOING_LEFT */
- return (am->steps_right > 1) && (am->steps_left == 1);
- }
-}
-
-static void net_am_turn(struct net_rx_am *am)
-{
- switch (am->tune_state) {
- case NET_AM_PARKING_ON_TOP:
- case NET_AM_PARKING_TIRED:
- break;
- case NET_AM_GOING_RIGHT:
- am->tune_state = NET_AM_GOING_LEFT;
- am->steps_left = 0;
- break;
- case NET_AM_GOING_LEFT:
- am->tune_state = NET_AM_GOING_RIGHT;
- am->steps_right = 0;
- break;
- }
-}
-
-static int net_am_step(struct net_rx_am *am)
-{
- if (am->tired == (NET_PARAMS_AM_NUM_PROFILES * 2))
- return NET_AM_TOO_TIRED;
-
- switch (am->tune_state) {
- case NET_AM_PARKING_ON_TOP:
- case NET_AM_PARKING_TIRED:
- break;
- case NET_AM_GOING_RIGHT:
- if (am->profile_ix == (NET_PARAMS_AM_NUM_PROFILES - 1))
- return NET_AM_ON_EDGE;
- am->profile_ix++;
- am->steps_right++;
- break;
- case NET_AM_GOING_LEFT:
- if (am->profile_ix == 0)
- return NET_AM_ON_EDGE;
- am->profile_ix--;
- am->steps_left++;
- break;
- }
-
- am->tired++;
- return NET_AM_STEPPED;
-}
-
-static void net_am_park_on_top(struct net_rx_am *am)
-{
- am->steps_right = 0;
- am->steps_left = 0;
- am->tired = 0;
- am->tune_state = NET_AM_PARKING_ON_TOP;
-}
-
-static void net_am_park_tired(struct net_rx_am *am)
-{
- am->steps_right = 0;
- am->steps_left = 0;
- am->tune_state = NET_AM_PARKING_TIRED;
-}
-
-static void net_am_exit_parking(struct net_rx_am *am)
-{
- am->tune_state = am->profile_ix ? NET_AM_GOING_LEFT :
- NET_AM_GOING_RIGHT;
- net_am_step(am);
-}
-
-#define IS_SIGNIFICANT_DIFF(val, ref) \
- (((100 * abs((val) - (ref))) / (ref)) > 10) /* more than 10% difference */
-
-static int net_am_stats_compare(struct net_rx_am_stats *curr,
- struct net_rx_am_stats *prev)
-{
- if (!prev->bpms)
- return curr->bpms ? NET_AM_STATS_BETTER :
- NET_AM_STATS_SAME;
-
- if (IS_SIGNIFICANT_DIFF(curr->bpms, prev->bpms))
- return (curr->bpms > prev->bpms) ? NET_AM_STATS_BETTER :
- NET_AM_STATS_WORSE;
-
- if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms))
- return (curr->ppms > prev->ppms) ? NET_AM_STATS_BETTER :
- NET_AM_STATS_WORSE;
-
- if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms))
- return (curr->epms < prev->epms) ? NET_AM_STATS_BETTER :
- NET_AM_STATS_WORSE;
-
- return NET_AM_STATS_SAME;
-}
-
-static bool net_am_decision(struct net_rx_am_stats *curr_stats,
- struct net_rx_am *am)
-{
- int prev_state = am->tune_state;
- int prev_ix = am->profile_ix;
- int stats_res;
- int step_res;
-
- switch (am->tune_state) {
- case NET_AM_PARKING_ON_TOP:
- stats_res = net_am_stats_compare(curr_stats, &am->prev_stats);
- if (stats_res != NET_AM_STATS_SAME)
- net_am_exit_parking(am);
- break;
-
- case NET_AM_PARKING_TIRED:
- am->tired--;
- if (!am->tired)
- net_am_exit_parking(am);
- break;
-
- case NET_AM_GOING_RIGHT:
- case NET_AM_GOING_LEFT:
- stats_res = net_am_stats_compare(curr_stats, &am->prev_stats);
- if (stats_res != NET_AM_STATS_BETTER)
- net_am_turn(am);
-
- if (net_am_on_top(am)) {
- net_am_park_on_top(am);
- break;
- }
-
- step_res = net_am_step(am);
- switch (step_res) {
- case NET_AM_ON_EDGE:
- net_am_park_on_top(am);
- break;
- case NET_AM_TOO_TIRED:
- net_am_park_tired(am);
- break;
- }
-
- break;
- }
-
- if ((prev_state != NET_AM_PARKING_ON_TOP) ||
- (am->tune_state != NET_AM_PARKING_ON_TOP))
- am->prev_stats = *curr_stats;
-
- return am->profile_ix != prev_ix;
-}
-
-static void net_am_sample(u16 event_ctr,
- u64 packets,
- u64 bytes,
- struct net_rx_am_sample *s)
-{
- s->time = ktime_get();
- s->pkt_ctr = packets;
- s->byte_ctr = bytes;
- s->event_ctr = event_ctr;
-}
-
-#define NET_AM_NEVENTS 64
-#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
-#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) & (BIT_ULL(bits) - 1))
-
-static void net_am_calc_stats(struct net_rx_am_sample *start,
- struct net_rx_am_sample *end,
- struct net_rx_am_stats *curr_stats)
-{
- /* u32 holds up to 71 minutes, should be enough */
- u32 delta_us = ktime_us_delta(end->time, start->time);
- u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
- u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
- start->byte_ctr);
-
- if (!delta_us)
- return;
-
- curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
- curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
- curr_stats->epms = DIV_ROUND_UP(NET_AM_NEVENTS * USEC_PER_MSEC,
- delta_us);
-}
-
-void net_rx_am(struct net_rx_am *am,
- u16 event_ctr,
- u64 packets,
- u64 bytes)
-{
- struct net_rx_am_sample end_sample;
- struct net_rx_am_stats curr_stats;
- u16 nevents;
-
- switch (am->state) {
- case NET_AM_MEASURE_IN_PROGRESS:
- nevents = BIT_GAP(BITS_PER_TYPE(u16), event_ctr,
- am->start_sample.event_ctr);
- if (nevents < NET_AM_NEVENTS)
- break;
- net_am_sample(event_ctr, packets, bytes, &end_sample);
- net_am_calc_stats(&am->start_sample, &end_sample,
- &curr_stats);
- if (net_am_decision(&curr_stats, am)) {
- am->state = NET_AM_APPLY_NEW_PROFILE;
- schedule_work(&am->work);
- break;
- }
- /* fall through */
- case NET_AM_START_MEASURE:
- net_am_sample(event_ctr, packets, bytes, &am->start_sample);
- am->state = NET_AM_MEASURE_IN_PROGRESS;
- break;
- case NET_AM_APPLY_NEW_PROFILE:
- break;
- }
-}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.h b/drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.h
deleted file mode 100644
index aa65e79..0000000
--- a/drivers/net/ethernet/mellanox/mlx5/core/net_rx_am.h
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
- * Copyright (c) 2017, Broadcom Limited
- *
- * This software is available to you under a choice of one of two
- * licenses. You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials
- * provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
-*/
-
-#ifndef NET_AM_H
-#define NET_AM_H
-
-struct net_cq_moder {
- u16 usec;
- u16 pkts;
-};
-
-struct net_rx_am_sample {
- ktime_t time;
- u32 pkt_ctr;
- u32 byte_ctr;
- u16 event_ctr;
-};
-
-struct net_rx_am_stats {
- int ppms; /* packets per msec */
- int bpms; /* bytes per msec */
- int epms; /* events per msec */
-};
-
-struct net_rx_am { /* Adaptive Moderation */
- u8 state;
- struct net_rx_am_stats prev_stats;
- struct net_rx_am_sample start_sample;
- struct work_struct work;
- u8 profile_ix;
- u8 mode;
- u8 tune_state;
- u8 steps_right;
- u8 steps_left;
- u8 tired;
-};
-
-enum {
- NET_CQ_PERIOD_MODE_START_FROM_EQE = 0x0,
- NET_CQ_PERIOD_MODE_START_FROM_CQE = 0x1,
- NET_CQ_PERIOD_NUM_MODES
-};
-
-/* Adaptive moderation logic */
-enum {
- NET_AM_START_MEASURE,
- NET_AM_MEASURE_IN_PROGRESS,
- NET_AM_APPLY_NEW_PROFILE,
-};
-
-enum {
- NET_AM_PARKING_ON_TOP,
- NET_AM_PARKING_TIRED,
- NET_AM_GOING_RIGHT,
- NET_AM_GOING_LEFT,
-};
-
-enum {
- NET_AM_STATS_WORSE,
- NET_AM_STATS_SAME,
- NET_AM_STATS_BETTER,
-};
-
-enum {
- NET_AM_STEPPED,
- NET_AM_TOO_TIRED,
- NET_AM_ON_EDGE,
-};
-
-void net_rx_am(struct net_rx_am *am,
- u16 event_ctr,
- u64 packets,
- u64 bytes);
-struct net_cq_moder net_am_get_def_profile(u8 rx_cq_period_mode);
-struct net_cq_moder net_am_get_profile(u8 cq_period_mode, int ix);
-
-#endif /* NET_AM_H */
diff --git a/include/linux/net_rx_am.h b/include/linux/net_rx_am.h
new file mode 100644
index 0000000..115cbde
--- /dev/null
+++ b/include/linux/net_rx_am.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved.
+ * Copyright (c) 2017, Broadcom Limited
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*/
+
+#ifndef NET_AM_H
+#define NET_AM_H
+
+#include <linux/module.h>
+
+struct net_cq_moder {
+ u16 usec;
+ u16 pkts;
+};
+
+struct net_rx_am_sample {
+ ktime_t time;
+ u32 pkt_ctr;
+ u32 byte_ctr;
+ u16 event_ctr;
+};
+
+struct net_rx_am_stats {
+ int ppms; /* packets per msec */
+ int bpms; /* bytes per msec */
+ int epms; /* events per msec */
+};
+
+struct net_rx_am { /* Adaptive Moderation */
+ u8 state;
+ struct net_rx_am_stats prev_stats;
+ struct net_rx_am_sample start_sample;
+ struct work_struct work;
+ u8 profile_ix;
+ u8 mode;
+ u8 tune_state;
+ u8 steps_right;
+ u8 steps_left;
+ u8 tired;
+};
+
+enum {
+ NET_CQ_PERIOD_MODE_START_FROM_EQE = 0x0,
+ NET_CQ_PERIOD_MODE_START_FROM_CQE = 0x1,
+ NET_CQ_PERIOD_NUM_MODES
+};
+
+/* Adaptive moderation logic */
+enum {
+ NET_AM_START_MEASURE,
+ NET_AM_MEASURE_IN_PROGRESS,
+ NET_AM_APPLY_NEW_PROFILE,
+};
+
+enum {
+ NET_AM_PARKING_ON_TOP,
+ NET_AM_PARKING_TIRED,
+ NET_AM_GOING_RIGHT,
+ NET_AM_GOING_LEFT,
+};
+
+enum {
+ NET_AM_STATS_WORSE,
+ NET_AM_STATS_SAME,
+ NET_AM_STATS_BETTER,
+};
+
+enum {
+ NET_AM_STEPPED,
+ NET_AM_TOO_TIRED,
+ NET_AM_ON_EDGE,
+};
+
+void net_rx_am(struct net_rx_am *am,
+ u16 event_ctr,
+ u64 packets,
+ u64 bytes);
+struct net_cq_moder net_am_get_def_profile(u8 rx_cq_period_mode);
+struct net_cq_moder net_am_get_profile(u8 cq_period_mode, int ix);
+
+#endif /* NET_AM_H */
diff --git a/lib/Makefile b/lib/Makefile
index b8f2c16..8f6bdc6 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -39,7 +39,7 @@ obj-y += bcd.o div64.o sort.o parser.o debug_locks.o random32.o \
gcd.o lcm.o list_sort.o uuid.o flex_array.o iov_iter.o clz_ctz.o \
bsearch.o find_bit.o llist.o memweight.o kfifo.o \
percpu-refcount.o percpu_ida.o rhashtable.o reciprocal_div.o \
- once.o refcount.o usercopy.o errseq.o
+ once.o refcount.o usercopy.o errseq.o net_rx_am.o
obj-y += string_helpers.o
obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
obj-y += hexdump.o
diff --git a/lib/net_rx_am.c b/lib/net_rx_am.c
new file mode 100644
index 0000000..3167ffa
--- /dev/null
+++ b/lib/net_rx_am.c
@@ -0,0 +1,306 @@
+/*
+ * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2017, Broadcom Limiited. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/net_rx_am.h>
+
+#define NET_PARAMS_AM_NUM_PROFILES 5
+/* Adaptive moderation profiles */
+#define NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256
+#define NET_RX_AM_DEF_PROFILE_CQE 1
+#define NET_RX_AM_DEF_PROFILE_EQE 1
+
+/* All profiles sizes must be NET_PARAMS_AM_NUM_PROFILES */
+#define NET_AM_EQE_PROFILES { \
+ {1, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
+ {8, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
+ {64, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
+ {128, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
+ {256, NET_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
+}
+
+#define NET_AM_CQE_PROFILES { \
+ {2, 256}, \
+ {8, 128}, \
+ {16, 64}, \
+ {32, 64}, \
+ {64, 64} \
+}
+
+static const struct net_cq_moder
+profile[NET_CQ_PERIOD_NUM_MODES][NET_PARAMS_AM_NUM_PROFILES] = {
+ NET_AM_EQE_PROFILES,
+ NET_AM_CQE_PROFILES,
+};
+
+struct net_cq_moder net_am_get_profile(u8 cq_period_mode, int ix)
+{
+ return profile[cq_period_mode][ix];
+}
+EXPORT_SYMBOL_GPL(net_am_get_profile);
+
+struct net_cq_moder net_am_get_def_profile(u8 rx_cq_period_mode)
+{
+ int default_profile_ix;
+
+ if (rx_cq_period_mode == NET_CQ_PERIOD_MODE_START_FROM_CQE)
+ default_profile_ix = NET_RX_AM_DEF_PROFILE_CQE;
+ else /* NET_CQ_PERIOD_MODE_START_FROM_EQE */
+ default_profile_ix = NET_RX_AM_DEF_PROFILE_EQE;
+
+ return profile[rx_cq_period_mode][default_profile_ix];
+}
+EXPORT_SYMBOL_GPL(net_am_get_def_profile);
+
+static bool net_am_on_top(struct net_rx_am *am)
+{
+ switch (am->tune_state) {
+ case NET_AM_PARKING_ON_TOP:
+ case NET_AM_PARKING_TIRED:
+ return true;
+ case NET_AM_GOING_RIGHT:
+ return (am->steps_left > 1) && (am->steps_right == 1);
+ default: /* NET_AM_GOING_LEFT */
+ return (am->steps_right > 1) && (am->steps_left == 1);
+ }
+}
+
+static void net_am_turn(struct net_rx_am *am)
+{
+ switch (am->tune_state) {
+ case NET_AM_PARKING_ON_TOP:
+ case NET_AM_PARKING_TIRED:
+ break;
+ case NET_AM_GOING_RIGHT:
+ am->tune_state = NET_AM_GOING_LEFT;
+ am->steps_left = 0;
+ break;
+ case NET_AM_GOING_LEFT:
+ am->tune_state = NET_AM_GOING_RIGHT;
+ am->steps_right = 0;
+ break;
+ }
+}
+
+static int net_am_step(struct net_rx_am *am)
+{
+ if (am->tired == (NET_PARAMS_AM_NUM_PROFILES * 2))
+ return NET_AM_TOO_TIRED;
+
+ switch (am->tune_state) {
+ case NET_AM_PARKING_ON_TOP:
+ case NET_AM_PARKING_TIRED:
+ break;
+ case NET_AM_GOING_RIGHT:
+ if (am->profile_ix == (NET_PARAMS_AM_NUM_PROFILES - 1))
+ return NET_AM_ON_EDGE;
+ am->profile_ix++;
+ am->steps_right++;
+ break;
+ case NET_AM_GOING_LEFT:
+ if (am->profile_ix == 0)
+ return NET_AM_ON_EDGE;
+ am->profile_ix--;
+ am->steps_left++;
+ break;
+ }
+
+ am->tired++;
+ return NET_AM_STEPPED;
+}
+
+static void net_am_park_on_top(struct net_rx_am *am)
+{
+ am->steps_right = 0;
+ am->steps_left = 0;
+ am->tired = 0;
+ am->tune_state = NET_AM_PARKING_ON_TOP;
+}
+
+static void net_am_park_tired(struct net_rx_am *am)
+{
+ am->steps_right = 0;
+ am->steps_left = 0;
+ am->tune_state = NET_AM_PARKING_TIRED;
+}
+
+static void net_am_exit_parking(struct net_rx_am *am)
+{
+ am->tune_state = am->profile_ix ? NET_AM_GOING_LEFT :
+ NET_AM_GOING_RIGHT;
+ net_am_step(am);
+}
+
+#define IS_SIGNIFICANT_DIFF(val, ref) \
+ (((100 * abs((val) - (ref))) / (ref)) > 10) /* more than 10% difference */
+
+static int net_am_stats_compare(struct net_rx_am_stats *curr,
+ struct net_rx_am_stats *prev)
+{
+ if (!prev->bpms)
+ return curr->bpms ? NET_AM_STATS_BETTER :
+ NET_AM_STATS_SAME;
+
+ if (IS_SIGNIFICANT_DIFF(curr->bpms, prev->bpms))
+ return (curr->bpms > prev->bpms) ? NET_AM_STATS_BETTER :
+ NET_AM_STATS_WORSE;
+
+ if (IS_SIGNIFICANT_DIFF(curr->ppms, prev->ppms))
+ return (curr->ppms > prev->ppms) ? NET_AM_STATS_BETTER :
+ NET_AM_STATS_WORSE;
+
+ if (IS_SIGNIFICANT_DIFF(curr->epms, prev->epms))
+ return (curr->epms < prev->epms) ? NET_AM_STATS_BETTER :
+ NET_AM_STATS_WORSE;
+
+ return NET_AM_STATS_SAME;
+}
+
+static bool net_am_decision(struct net_rx_am_stats *curr_stats,
+ struct net_rx_am *am)
+{
+ int prev_state = am->tune_state;
+ int prev_ix = am->profile_ix;
+ int stats_res;
+ int step_res;
+
+ switch (am->tune_state) {
+ case NET_AM_PARKING_ON_TOP:
+ stats_res = net_am_stats_compare(curr_stats, &am->prev_stats);
+ if (stats_res != NET_AM_STATS_SAME)
+ net_am_exit_parking(am);
+ break;
+
+ case NET_AM_PARKING_TIRED:
+ am->tired--;
+ if (!am->tired)
+ net_am_exit_parking(am);
+ break;
+
+ case NET_AM_GOING_RIGHT:
+ case NET_AM_GOING_LEFT:
+ stats_res = net_am_stats_compare(curr_stats, &am->prev_stats);
+ if (stats_res != NET_AM_STATS_BETTER)
+ net_am_turn(am);
+
+ if (net_am_on_top(am)) {
+ net_am_park_on_top(am);
+ break;
+ }
+
+ step_res = net_am_step(am);
+ switch (step_res) {
+ case NET_AM_ON_EDGE:
+ net_am_park_on_top(am);
+ break;
+ case NET_AM_TOO_TIRED:
+ net_am_park_tired(am);
+ break;
+ }
+
+ break;
+ }
+
+ if ((prev_state != NET_AM_PARKING_ON_TOP) ||
+ (am->tune_state != NET_AM_PARKING_ON_TOP))
+ am->prev_stats = *curr_stats;
+
+ return am->profile_ix != prev_ix;
+}
+
+static void net_am_sample(u16 event_ctr,
+ u64 packets,
+ u64 bytes,
+ struct net_rx_am_sample *s)
+{
+ s->time = ktime_get();
+ s->pkt_ctr = packets;
+ s->byte_ctr = bytes;
+ s->event_ctr = event_ctr;
+}
+
+#define NET_AM_NEVENTS 64
+#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
+#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) & (BIT_ULL(bits) - 1))
+
+static void net_am_calc_stats(struct net_rx_am_sample *start,
+ struct net_rx_am_sample *end,
+ struct net_rx_am_stats *curr_stats)
+{
+ /* u32 holds up to 71 minutes, should be enough */
+ u32 delta_us = ktime_us_delta(end->time, start->time);
+ u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
+ u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
+ start->byte_ctr);
+
+ if (!delta_us)
+ return;
+
+ curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
+ curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
+ curr_stats->epms = DIV_ROUND_UP(NET_AM_NEVENTS * USEC_PER_MSEC,
+ delta_us);
+}
+
+void net_rx_am(struct net_rx_am *am,
+ u16 event_ctr,
+ u64 packets,
+ u64 bytes)
+{
+ struct net_rx_am_sample end_sample;
+ struct net_rx_am_stats curr_stats;
+ u16 nevents;
+
+ switch (am->state) {
+ case NET_AM_MEASURE_IN_PROGRESS:
+ nevents = BIT_GAP(BITS_PER_TYPE(u16), event_ctr,
+ am->start_sample.event_ctr);
+ if (nevents < NET_AM_NEVENTS)
+ break;
+ net_am_sample(event_ctr, packets, bytes, &end_sample);
+ net_am_calc_stats(&am->start_sample, &end_sample,
+ &curr_stats);
+ if (net_am_decision(&curr_stats, am)) {
+ am->state = NET_AM_APPLY_NEW_PROFILE;
+ schedule_work(&am->work);
+ break;
+ }
+ /* fall through */
+ case NET_AM_START_MEASURE:
+ net_am_sample(event_ctr, packets, bytes, &am->start_sample);
+ am->state = NET_AM_MEASURE_IN_PROGRESS;
+ break;
+ case NET_AM_APPLY_NEW_PROFILE:
+ break;
+ }
+}
+EXPORT_SYMBOL_GPL(net_rx_am);
--
2.7.4
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