linux-kernel - [PATCH net-next v2 5/6] net: ipa: don't pass tag value to ipa_cmd_ip_tag_status

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Date:   Tue, 26 Jan 2021 12:57:02 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     elder@...nel.org, evgreen@...omium.org, bjorn.andersson@...aro.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 5/6] net: ipa: don't pass tag value to ipa_cmd_ip_tag_status_add()

We only send a tagged packet from the AP->command TX endpoint when
we're clearing the hardware pipeline.  And when we receive the
tagged packet we don't care what the actual tag value is.

Stop passing a tag value to ipa_cmd_ip_tag_status_add(), and just
encode 0 as the tag sent.  Fix the function that encodes the tag so
it uses the proper byte ordering.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_cmd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 7df0072bddcce..eb50e7437359a 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -529,7 +529,7 @@ void ipa_cmd_dma_shared_mem_add(struct gsi_trans *trans, u32 offset, u16 size,
 			  direction, opcode);
 }
 
-static void ipa_cmd_ip_tag_status_add(struct gsi_trans *trans, u64 tag)
+static void ipa_cmd_ip_tag_status_add(struct gsi_trans *trans)
 {
 	struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
 	enum ipa_cmd_opcode opcode = IPA_CMD_IP_PACKET_TAG_STATUS;
@@ -543,7 +543,7 @@ static void ipa_cmd_ip_tag_status_add(struct gsi_trans *trans, u64 tag)
 	cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
 	payload = &cmd_payload->ip_packet_tag_status;
 
-	payload->tag = u64_encode_bits(tag, IP_PACKET_TAG_STATUS_TAG_FMASK);
+	payload->tag = le64_encode_bits(0, IP_PACKET_TAG_STATUS_TAG_FMASK);
 
 	gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
 			  direction, opcode);
@@ -583,13 +583,13 @@ void ipa_cmd_pipeline_clear_add(struct gsi_trans *trans)
 	 * command says to send the next packet directly to the exception
 	 * endpoint without any other IPA processing.  The tag_status
 	 * command requests that status be generated on completion of
-	 * that transfer, and that it will contain the given tag value.
+	 * that transfer, and that it will be tagged with a value.
 	 * Finally, the transfer command sends a small packet of data
 	 * (instead of a command) using the command endpoint.
 	 */
 	endpoint = ipa->name_map[IPA_ENDPOINT_AP_LAN_RX];
 	ipa_cmd_ip_packet_init_add(trans, endpoint->endpoint_id);
-	ipa_cmd_ip_tag_status_add(trans, 0xcba987654321);
+	ipa_cmd_ip_tag_status_add(trans);
 	ipa_cmd_transfer_add(trans, 4);
 }
 
-- 
2.20.1