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Subject[PATCH net-next 2/3] net: ipa: reduce aggregation time limit
Date
Halve the time limit used when aggregation is enabled on an RX
endpoint, to half a millisecond.

Use DIV_ROUND_CLOSEST() to compute the value that represents the
time period, to get better accuracy in the event the time limit is
not an even multiple of the granularity.

Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/net/ipa/ipa_endpoint.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 9f50d0d11704..93449366d7d8 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -36,7 +36,7 @@
#define IPA_ENDPOINT_QMAP_METADATA_MASK 0x000000ff /* host byte order */

#define IPA_ENDPOINT_RESET_AGGR_RETRY_MAX 3
-#define IPA_AGGR_TIME_LIMIT_DEFAULT 1000 /* microseconds */
+#define IPA_AGGR_TIME_LIMIT_DEFAULT 500 /* microseconds */

/** enum ipa_status_opcode - status element opcode hardware values */
enum ipa_status_opcode {
@@ -583,9 +583,11 @@ static void ipa_endpoint_init_aggr(struct ipa_endpoint *endpoint)
val |= u32_encode_bits(IPA_GENERIC, AGGR_TYPE_FMASK);
val |= u32_encode_bits(aggr_size,
AGGR_BYTE_LIMIT_FMASK);
+
limit = IPA_AGGR_TIME_LIMIT_DEFAULT;
- val |= u32_encode_bits(limit / IPA_AGGR_GRANULARITY,
- AGGR_TIME_LIMIT_FMASK);
+ limit = DIV_ROUND_CLOSEST(limit, IPA_AGGR_GRANULARITY);
+ val |= u32_encode_bits(limit, AGGR_TIME_LIMIT_FMASK);
+
val |= u32_encode_bits(0, AGGR_PKT_LIMIT_FMASK);
if (endpoint->data->rx.aggr_close_eof)
val |= AGGR_SW_EOF_ACTIVE_FMASK;
--
2.25.1
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