linux-kernel - [PATCH net-next 2/8] net: ipa: extend endpoints in packet init command

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Date:   Mon, 30 Jan 2023 15:01:52 -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 2/8] net: ipa: extend endpoints in packet init command

The IP_PACKET_INIT immediate command defines the destination
endpoint to which a packet should be sent.  Prior to IPA v5.0, a
5 bit field in that command represents the endpoint, but starting
with IPA v5.0, the field is extended to 8 bits to support more than
32 endpoints.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_cmd.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index aa2b594ca5067..5d3a875e50fee 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -94,11 +94,11 @@ struct ipa_cmd_register_write {
 /* IPA_CMD_IP_PACKET_INIT */
 
 struct ipa_cmd_ip_packet_init {
-	u8 dest_endpoint;
+	u8 dest_endpoint;	/* Full 8 bits used for IPA v5.0+ */
 	u8 reserved[7];
 };
 
-/* Field masks for ipa_cmd_ip_packet_init dest_endpoint field */
+/* Field mask for ipa_cmd_ip_packet_init dest_endpoint field (unused v5.0+) */
 #define IPA_PACKET_INIT_DEST_ENDPOINT_FMASK		GENMASK(4, 0)
 
 /* IPA_CMD_DMA_SHARED_MEM */
@@ -491,8 +491,13 @@ static void ipa_cmd_ip_packet_init_add(struct gsi_trans *trans, u8 endpoint_id)
 	cmd_payload = ipa_cmd_payload_alloc(ipa, &payload_addr);
 	payload = &cmd_payload->ip_packet_init;
 
-	payload->dest_endpoint = u8_encode_bits(endpoint_id,
-					IPA_PACKET_INIT_DEST_ENDPOINT_FMASK);
+	if (ipa->version < IPA_VERSION_5_0) {
+		payload->dest_endpoint =
+			u8_encode_bits(endpoint_id,
+				       IPA_PACKET_INIT_DEST_ENDPOINT_FMASK);
+	} else {
+		payload->dest_endpoint = endpoint_id;
+	}
 
 	gsi_trans_cmd_add(trans, payload, sizeof(*payload), payload_addr,
 			  opcode);
-- 
2.34.1