linux-kernel - [PATCH net-next 4/8] net: ipa: update table cache flushing

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Date:   Mon, 30 Jan 2023 15:01:54 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     caleb.connolly@...aro.org, mka@...omium.org, evgreen@...omium.org,
        andersson@...nel.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 4/8] net: ipa: update table cache flushing

Update the code that causes filter and router table caches to be
flushed so that it supports IPA versions 5.0+.  It adds a comment in
ipa_hardware_config_hashing() that explains that cacheing does not
need to be enabled, just as before, because it's enabled by default.
(For the record, the FILT_ROUT_CACHE_CFG register would have been
used if we wanted to explicitly enable these.)

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_cmd.c   |  6 +++++-
 drivers/net/ipa/ipa_main.c  |  7 ++++++-
 drivers/net/ipa/ipa_table.c | 23 ++++++++++++++++-------
 3 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 5d3a875e50fee..16169641ddebe 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -295,7 +295,11 @@ static bool ipa_cmd_register_write_valid(struct ipa *ipa)
 	 * offset will fit in a register write IPA immediate command.
 	 */
 	if (ipa_table_hash_support(ipa)) {
-		reg = ipa_reg(ipa, FILT_ROUT_HASH_FLUSH);
+		if (ipa->version < IPA_VERSION_5_0)
+			reg = ipa_reg(ipa, FILT_ROUT_HASH_FLUSH);
+		else
+			reg = ipa_reg(ipa, FILT_ROUT_CACHE_FLUSH);
+
 		offset = ipa_reg_offset(reg);
 		name = "filter/route hash flush";
 		if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 4fb92f7719741..f3466b913394c 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2018-2022 Linaro Ltd.
+ * Copyright (C) 2018-2023 Linaro Ltd.
  */
 
 #include <linux/types.h>
@@ -432,6 +432,11 @@ static void ipa_hardware_config_hashing(struct ipa *ipa)
 {
 	const struct ipa_reg *reg;
 
+	/* Other than IPA v4.2, all versions enable "hashing".  Starting
+	 * with IPA v5.0, the filter and router tables are implemented
+	 * differently, but the default configuration enables this feature
+	 * (now referred to as "cacheing"), so there's nothing to do here.
+	 */
 	if (ipa->version != IPA_VERSION_4_2)
 		return;
 
diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
index b81e27b613549..32ed9fec2ca74 100644
--- a/drivers/net/ipa/ipa_table.c
+++ b/drivers/net/ipa/ipa_table.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
 /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2018-2022 Linaro Ltd.
+ * Copyright (C) 2018-2023 Linaro Ltd.
  */
 
 #include <linux/types.h>
@@ -359,13 +359,22 @@ int ipa_table_hash_flush(struct ipa *ipa)
 		return -EBUSY;
 	}
 
-	reg = ipa_reg(ipa, FILT_ROUT_HASH_FLUSH);
-	offset = ipa_reg_offset(reg);
+	if (ipa->version < IPA_VERSION_5_0) {
+		reg = ipa_reg(ipa, FILT_ROUT_HASH_FLUSH);
+		offset = ipa_reg_offset(reg);
 
-	val = ipa_reg_bit(reg, IPV6_ROUTER_HASH);
-	val |= ipa_reg_bit(reg, IPV6_FILTER_HASH);
-	val |= ipa_reg_bit(reg, IPV4_ROUTER_HASH);
-	val |= ipa_reg_bit(reg, IPV4_FILTER_HASH);
+		val = ipa_reg_bit(reg, IPV6_ROUTER_HASH);
+		val |= ipa_reg_bit(reg, IPV6_FILTER_HASH);
+		val |= ipa_reg_bit(reg, IPV4_ROUTER_HASH);
+		val |= ipa_reg_bit(reg, IPV4_FILTER_HASH);
+	} else {
+		reg = ipa_reg(ipa, FILT_ROUT_CACHE_FLUSH);
+		offset = ipa_reg_offset(reg);
+
+		/* IPA v5.0+ uses a unified cache (both IPv4 and IPv6) */
+		val = ipa_reg_bit(reg, ROUTER_CACHE);
+		val |= ipa_reg_bit(reg, FILTER_CACHE);
+	}
 
 	ipa_cmd_register_write_add(trans, offset, val, val, false);
 
-- 
2.34.1