netdev - [PATCH net-next v4 3/4] dim: introduce a specific dim profile for better latency

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Date: Fri,  5 Apr 2024 10:15:46 +0200
From: Louis Peens <louis.peens@...igine.com>
To: David Miller <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Jiri Pirko <jiri@...nulli.us>,
	Fei Qin <fei.qin@...igine.com>,
	netdev@...r.kernel.org,
	oss-drivers@...igine.com
Subject: [PATCH net-next v4 3/4] dim: introduce a specific dim profile for better latency

From: Fei Qin <fei.qin@...igine.com>

The current profile is not well-adaptive to NFP NICs in
terms of latency, so introduce a specific profile for better
latency.

Signed-off-by: Fei Qin <fei.qin@...igine.com>
Signed-off-by: Louis Peens <louis.peens@...igine.com>
---
 include/linux/dim.h |  2 ++
 lib/dim/net_dim.c   | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/include/linux/dim.h b/include/linux/dim.h
index f343bc9aa2ec..edd6d7bceb28 100644
--- a/include/linux/dim.h
+++ b/include/linux/dim.h
@@ -119,11 +119,13 @@ struct dim {
  *
  * @DIM_CQ_PERIOD_MODE_START_FROM_EQE: Start counting from EQE
  * @DIM_CQ_PERIOD_MODE_START_FROM_CQE: Start counting from CQE (implies timer reset)
+ * @DIM_CQ_PERIOD_MODE_SPECIFIC_0: Specific mode to improve latency
  * @DIM_CQ_PERIOD_NUM_MODES: Number of modes
  */
 enum dim_cq_period_mode {
 	DIM_CQ_PERIOD_MODE_START_FROM_EQE = 0x0,
 	DIM_CQ_PERIOD_MODE_START_FROM_CQE = 0x1,
+	DIM_CQ_PERIOD_MODE_SPECIFIC_0 = 0x2,
 	DIM_CQ_PERIOD_NUM_MODES
 };
 
diff --git a/lib/dim/net_dim.c b/lib/dim/net_dim.c
index 4e32f7aaac86..2b5dccb6242c 100644
--- a/lib/dim/net_dim.c
+++ b/lib/dim/net_dim.c
@@ -33,6 +33,14 @@
 	{.usec = 64, .pkts = 64,}               \
 }
 
+#define NET_DIM_RX_SPECIFIC_0_PROFILES { \
+	{.usec = 0,   .pkts = 1,},   \
+	{.usec = 4,   .pkts = 32,},  \
+	{.usec = 64,  .pkts = 64,},  \
+	{.usec = 128, .pkts = 256,}, \
+	{.usec = 256, .pkts = 256,}  \
+}
+
 #define NET_DIM_TX_EQE_PROFILES { \
 	{.usec = 1,   .pkts = NET_DIM_DEFAULT_TX_CQ_PKTS_FROM_EQE,},  \
 	{.usec = 8,   .pkts = NET_DIM_DEFAULT_TX_CQ_PKTS_FROM_EQE,},  \
@@ -49,16 +57,26 @@
 	{.usec = 64, .pkts = 32,}   \
 }
 
+#define NET_DIM_TX_SPECIFIC_0_PROFILES { \
+	{.usec = 0,   .pkts = 1,},   \
+	{.usec = 4,   .pkts = 16,},  \
+	{.usec = 32,  .pkts = 64,},  \
+	{.usec = 64,  .pkts = 128,}, \
+	{.usec = 128, .pkts = 128,}  \
+}
+
 static const struct dim_cq_moder
 rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
 	NET_DIM_RX_EQE_PROFILES,
 	NET_DIM_RX_CQE_PROFILES,
+	NET_DIM_RX_SPECIFIC_0_PROFILES,
 };
 
 static const struct dim_cq_moder
 tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
 	NET_DIM_TX_EQE_PROFILES,
 	NET_DIM_TX_CQE_PROFILES,
+	NET_DIM_TX_SPECIFIC_0_PROFILES,
 };
 
 struct dim_cq_moder
-- 
2.34.1