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Message-Id: <20220522003223.1123705-4-elder@linaro.org>
Date: Sat, 21 May 2022 19:32:17 -0500
From: Alex Elder <elder@...aro.org>
To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com
Cc: mka@...omium.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
quic_cpratapa@...cinc.com, quic_avuyyuru@...cinc.com,
quic_jponduru@...cinc.com, quic_subashab@...cinc.com,
elder@...nel.org, netdev@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 3/9] net: ipa: specify RX aggregation time limit in config data
Don't assume that a 500 microsecond time limit should be used for
all receive endpoints that support aggregation. Instead, specify
the time limit to use in the configuration data.
Set a 500 microsecond limit for all existing RX endpoints, as before.
Checking for overflow for the time limit field is a bit complicated.
Rather than duplicate a lot of code in ipa_endpoint_data_valid_one(),
call WARN() if any value is found to be too large when encoding it.
Signed-off-by: Alex Elder <elder@...aro.org>
---
drivers/net/ipa/ipa_data-v3.1.c | 2 ++
drivers/net/ipa/ipa_data-v3.5.1.c | 2 ++
drivers/net/ipa/ipa_data-v4.11.c | 2 ++
drivers/net/ipa/ipa_data-v4.2.c | 2 ++
drivers/net/ipa/ipa_data-v4.5.c | 2 ++
drivers/net/ipa/ipa_data-v4.9.c | 2 ++
drivers/net/ipa/ipa_endpoint.c | 21 +++++++++++++++++----
drivers/net/ipa/ipa_endpoint.h | 6 ++++++
8 files changed, 35 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ipa/ipa_data-v3.1.c b/drivers/net/ipa/ipa_data-v3.1.c
index 8ff351aefd23f..00f4e506e6e51 100644
--- a/drivers/net/ipa/ipa_data-v3.1.c
+++ b/drivers/net/ipa/ipa_data-v3.1.c
@@ -103,6 +103,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.rx = {
.buffer_size = 8192,
.pad_align = ilog2(sizeof(u32)),
+ .aggr_time_limit = 500,
},
},
},
@@ -150,6 +151,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.aggregation = true,
.rx = {
.buffer_size = 8192,
+ .aggr_time_limit = 500,
.aggr_close_eof = true,
},
},
diff --git a/drivers/net/ipa/ipa_data-v3.5.1.c b/drivers/net/ipa/ipa_data-v3.5.1.c
index d1c466abddb22..b7e32e87733eb 100644
--- a/drivers/net/ipa/ipa_data-v3.5.1.c
+++ b/drivers/net/ipa/ipa_data-v3.5.1.c
@@ -94,6 +94,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.rx = {
.buffer_size = 8192,
.pad_align = ilog2(sizeof(u32)),
+ .aggr_time_limit = 500,
},
},
},
@@ -142,6 +143,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.aggregation = true,
.rx = {
.buffer_size = 8192,
+ .aggr_time_limit = 500,
.aggr_close_eof = true,
},
},
diff --git a/drivers/net/ipa/ipa_data-v4.11.c b/drivers/net/ipa/ipa_data-v4.11.c
index b1991cc6f0ca6..1be823e5c5c22 100644
--- a/drivers/net/ipa/ipa_data-v4.11.c
+++ b/drivers/net/ipa/ipa_data-v4.11.c
@@ -88,6 +88,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.rx = {
.buffer_size = 8192,
.pad_align = ilog2(sizeof(u32)),
+ .aggr_time_limit = 500,
},
},
},
@@ -135,6 +136,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.aggregation = true,
.rx = {
.buffer_size = 32768,
+ .aggr_time_limit = 500,
.aggr_close_eof = true,
},
},
diff --git a/drivers/net/ipa/ipa_data-v4.2.c b/drivers/net/ipa/ipa_data-v4.2.c
index 1190a43e8743c..683f1f91042f4 100644
--- a/drivers/net/ipa/ipa_data-v4.2.c
+++ b/drivers/net/ipa/ipa_data-v4.2.c
@@ -84,6 +84,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.rx = {
.buffer_size = 8192,
.pad_align = ilog2(sizeof(u32)),
+ .aggr_time_limit = 500,
},
},
},
@@ -132,6 +133,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.aggregation = true,
.rx = {
.buffer_size = 8192,
+ .aggr_time_limit = 500,
.aggr_close_eof = true,
},
},
diff --git a/drivers/net/ipa/ipa_data-v4.5.c b/drivers/net/ipa/ipa_data-v4.5.c
index 944f72b0f285e..79398f286a9cf 100644
--- a/drivers/net/ipa/ipa_data-v4.5.c
+++ b/drivers/net/ipa/ipa_data-v4.5.c
@@ -97,6 +97,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.rx = {
.buffer_size = 8192,
.pad_align = ilog2(sizeof(u32)),
+ .aggr_time_limit = 500,
},
},
},
@@ -144,6 +145,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.aggregation = true,
.rx = {
.buffer_size = 8192,
+ .aggr_time_limit = 500,
.aggr_close_eof = true,
},
},
diff --git a/drivers/net/ipa/ipa_data-v4.9.c b/drivers/net/ipa/ipa_data-v4.9.c
index 16786bff7ef84..4b96efd05cf22 100644
--- a/drivers/net/ipa/ipa_data-v4.9.c
+++ b/drivers/net/ipa/ipa_data-v4.9.c
@@ -89,6 +89,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.rx = {
.buffer_size = 8192,
.pad_align = ilog2(sizeof(u32)),
+ .aggr_time_limit = 500,
},
},
},
@@ -136,6 +137,7 @@ static const struct ipa_gsi_endpoint_data ipa_gsi_endpoint_data[] = {
.aggregation = true,
.rx = {
.buffer_size = 8192,
+ .aggr_time_limit = 500,
.aggr_close_eof = true,
},
},
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 6079670bd8605..586529511cf6b 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -35,7 +35,6 @@
#define IPA_ENDPOINT_QMAP_METADATA_MASK 0x000000ff /* host byte order */
#define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX 3
-#define IPA_AGGR_TIME_LIMIT 500 /* microseconds */
/** enum ipa_status_opcode - status element opcode hardware values */
enum ipa_status_opcode {
@@ -142,6 +141,13 @@ static bool ipa_endpoint_data_valid_one(struct ipa *ipa, u32 count,
bool result = true;
/* No aggregation; check for bogus aggregation data */
+ if (rx_config->aggr_time_limit) {
+ dev_err(dev,
+ "time limit with no aggregation for RX endpoint %u\n",
+ data->endpoint_id);
+ result = false;
+ }
+
if (rx_config->aggr_hard_limit) {
dev_err(dev, "hard limit with no aggregation for RX endpoint %u\n",
data->endpoint_id);
@@ -722,9 +728,13 @@ static u32 aggr_time_limit_encoded(enum ipa_version version, u32 limit)
if (version < IPA_VERSION_4_5) {
/* We set aggregation granularity in ipa_hardware_config() */
- limit = DIV_ROUND_CLOSEST(limit, IPA_AGGR_GRANULARITY);
+ fmask = aggr_time_limit_fmask(true);
+ val = DIV_ROUND_CLOSEST(limit, IPA_AGGR_GRANULARITY);
+ WARN(val > field_max(fmask),
+ "aggr_time_limit too large (%u > %u usec)\n",
+ val, field_max(fmask) * IPA_AGGR_GRANULARITY);
- return u32_encode_bits(limit, aggr_time_limit_fmask(true));
+ return u32_encode_bits(val, fmask);
}
/* IPA v4.5 expresses the time limit using Qtime. The AP has
@@ -739,6 +749,9 @@ static u32 aggr_time_limit_encoded(enum ipa_version version, u32 limit)
/* Have to use pulse generator 1 (millisecond granularity) */
gran_sel = AGGR_GRAN_SEL_FMASK;
val = DIV_ROUND_CLOSEST(limit, 1000);
+ WARN(val > field_max(fmask),
+ "aggr_time_limit too large (%u > %u usec)\n",
+ limit, field_max(fmask) * 1000);
} else {
/* We can use pulse generator 0 (100 usec granularity) */
gran_sel = 0;
@@ -779,7 +792,7 @@ static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
rx_config->aggr_hard_limit);
val |= aggr_byte_limit_encoded(version, limit);
- limit = IPA_AGGR_TIME_LIMIT;
+ limit = rx_config->aggr_time_limit;
val |= aggr_time_limit_encoded(version, limit);
/* AGGR_PKT_LIMIT is 0 (unlimited) */
diff --git a/drivers/net/ipa/ipa_endpoint.h b/drivers/net/ipa/ipa_endpoint.h
index 1e72a9695d3d9..01790c60bee8d 100644
--- a/drivers/net/ipa/ipa_endpoint.h
+++ b/drivers/net/ipa/ipa_endpoint.h
@@ -59,6 +59,7 @@ struct ipa_endpoint_tx {
* struct ipa_endpoint_rx - Endpoint configuration for RX endpoints
* @buffer_size: requested receive buffer size (bytes)
* @pad_align: power-of-2 boundary to which packet payload is aligned
+ * @aggr_time_limit: time before aggregation closes (microseconds)
* @aggr_hard_limit: whether aggregation closes before or after boundary
* @aggr_close_eof: whether aggregation closes on end-of-frame
* @holb_drop: whether to drop packets to avoid head-of-line blocking
@@ -74,6 +75,10 @@ struct ipa_endpoint_tx {
* Aggregation is "open" while a buffer is being filled, and "closes" when
* certain criteria are met.
*
+ * A time limit can be specified to close aggregation. Aggregation will be
+ * closed if this period passes after data is first written into a receive
+ * buffer. If not specified, no time limit is imposed.
+ *
* Insufficient space available in the receive buffer can close aggregation.
* The aggregation byte limit defines the point (in units of 1024 bytes) in
* the buffer where aggregation closes. With a "soft" aggregation limit,
@@ -84,6 +89,7 @@ struct ipa_endpoint_tx {
struct ipa_endpoint_rx {
u32 buffer_size;
u32 pad_align;
+ u32 aggr_time_limit;
bool aggr_hard_limit;
bool aggr_close_eof;
bool holb_drop;
--
2.32.0
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