linux-kernel - [PATCH net-next 3/7] net: ipa: rework how HOL

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Message-Id: <20211124202511.862588-4-elder@linaro.org>
Date:   Wed, 24 Nov 2021 14:25:07 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     pkurapat@...eaurora.org, avuyyuru@...eaurora.org,
        bjorn.andersson@...aro.org, cpratapa@...eaurora.org,
        subashab@...eaurora.org, evgreen@...omium.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/7] net: ipa: rework how HOL_BLOCK handling is specified

The head-of-line block (HOLB) drop timer is only meaningful when
dropping packets due to blocking is enabled.  Given that, redefine
the interface so the timer is specified when enabling HOLB drop, and
use a different function when disabling.

To enable and disable HOLB drop, these functions will now be used:
  ipa_endpoint_init_hol_block_enable(endpoint, milliseconds)
  ipa_endpoint_init_hol_block_disable(endpoint)

The existing ipa_endpoint_init_hol_block_enable() becomes a helper
function, renamed ipa_endpoint_init_hol_block_en(), and used with
ipa_endpoint_init_hol_block_timer() to enable HOLB block on an
endpoint.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index ef790fd0ab56a..405410a6222ce 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -860,7 +860,7 @@ static void ipa_endpoint_init_hol_block_timer(struct ipa_endpoint *endpoint,
 }
 
 static void
-ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
+ipa_endpoint_init_hol_block_en(struct ipa_endpoint *endpoint, bool enable)
 {
 	u32 endpoint_id = endpoint->endpoint_id;
 	u32 offset;
@@ -874,6 +874,19 @@ ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
 		iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
 
+/* Assumes HOL_BLOCK is in disabled state */
+static void ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint,
+					       u32 microseconds)
+{
+	ipa_endpoint_init_hol_block_timer(endpoint, microseconds);
+	ipa_endpoint_init_hol_block_en(endpoint, true);
+}
+
+static void ipa_endpoint_init_hol_block_disable(struct ipa_endpoint *endpoint)
+{
+	ipa_endpoint_init_hol_block_en(endpoint, false);
+}
+
 void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
 {
 	u32 i;
@@ -884,9 +897,8 @@ void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)
 		if (endpoint->toward_ipa || endpoint->ee_id != GSI_EE_MODEM)
 			continue;
 
-		ipa_endpoint_init_hol_block_enable(endpoint, false);
-		ipa_endpoint_init_hol_block_timer(endpoint, 0);
-		ipa_endpoint_init_hol_block_enable(endpoint, true);
+		ipa_endpoint_init_hol_block_disable(endpoint);
+		ipa_endpoint_init_hol_block_enable(endpoint, 0);
 	}
 }
 
-- 
2.32.0