sfc: MAE functions to create/update/delete encap headers

Besides the raw header data, also pass the tunnel type, so that the
 hardware knows it needs to update the IP Total Length and UDP Length
 fields (and corresponding checksums) for each packet.
Also, populate the ENCAP_HEADER_ID field in efx_mae_alloc_action_set()
 with the fw_id returned from efx_mae_allocate_encap_md().
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/sfc/mae.c

@@ -15,6 +15,7 @@
 #include "mcdi.h"
 #include "mcdi_pcol.h"
 #include "mcdi_pcol_mae.h"
+#include "tc_encap_actions.h"
 
 int efx_mae_allocate_mport(struct efx_nic *efx, u32 *id, u32 *label)
 {
@@ -610,6 +611,87 @@ static int efx_mae_encap_type_to_mae_type(enum efx_encap_type type)
 	}
 }
 
+int efx_mae_allocate_encap_md(struct efx_nic *efx,
+			      struct efx_tc_encap_action *encap)
+{
+	MCDI_DECLARE_BUF(inbuf, MC_CMD_MAE_ENCAP_HEADER_ALLOC_IN_LEN(EFX_TC_MAX_ENCAP_HDR));
+	MCDI_DECLARE_BUF(outbuf, MC_CMD_MAE_ENCAP_HEADER_ALLOC_OUT_LEN);
+	size_t inlen, outlen;
+	int rc;
+
+	rc = efx_mae_encap_type_to_mae_type(encap->type);
+	if (rc < 0)
+		return rc;
+	MCDI_SET_DWORD(inbuf, MAE_ENCAP_HEADER_ALLOC_IN_ENCAP_TYPE, rc);
+	inlen = MC_CMD_MAE_ENCAP_HEADER_ALLOC_IN_LEN(encap->encap_hdr_len);
+	if (WARN_ON(inlen > sizeof(inbuf))) /* can't happen */
+		return -EINVAL;
+	memcpy(MCDI_PTR(inbuf, MAE_ENCAP_HEADER_ALLOC_IN_HDR_DATA),
+	       encap->encap_hdr,
+	       encap->encap_hdr_len);
+	rc = efx_mcdi_rpc(efx, MC_CMD_MAE_ENCAP_HEADER_ALLOC, inbuf,
+			  inlen, outbuf, sizeof(outbuf), &outlen);
+	if (rc)
+		return rc;
+	if (outlen < sizeof(outbuf))
+		return -EIO;
+	encap->fw_id = MCDI_DWORD(outbuf, MAE_ENCAP_HEADER_ALLOC_OUT_ENCAP_HEADER_ID);
+	return 0;
+}
+
+int efx_mae_update_encap_md(struct efx_nic *efx,
+			    struct efx_tc_encap_action *encap)
+{
+	MCDI_DECLARE_BUF(inbuf, MC_CMD_MAE_ENCAP_HEADER_UPDATE_IN_LEN(EFX_TC_MAX_ENCAP_HDR));
+	size_t inlen;
+	int rc;
+
+	rc = efx_mae_encap_type_to_mae_type(encap->type);
+	if (rc < 0)
+		return rc;
+	MCDI_SET_DWORD(inbuf, MAE_ENCAP_HEADER_UPDATE_IN_ENCAP_TYPE, rc);
+	MCDI_SET_DWORD(inbuf, MAE_ENCAP_HEADER_UPDATE_IN_EH_ID,
+		       encap->fw_id);
+	inlen = MC_CMD_MAE_ENCAP_HEADER_UPDATE_IN_LEN(encap->encap_hdr_len);
+	if (WARN_ON(inlen > sizeof(inbuf))) /* can't happen */
+		return -EINVAL;
+	memcpy(MCDI_PTR(inbuf, MAE_ENCAP_HEADER_UPDATE_IN_HDR_DATA),
+	       encap->encap_hdr,
+	       encap->encap_hdr_len);
+
+	BUILD_BUG_ON(MC_CMD_MAE_ENCAP_HEADER_UPDATE_OUT_LEN != 0);
+	return efx_mcdi_rpc(efx, MC_CMD_MAE_ENCAP_HEADER_UPDATE, inbuf,
+			    inlen, NULL, 0, NULL);
+}
+
+int efx_mae_free_encap_md(struct efx_nic *efx,
+			  struct efx_tc_encap_action *encap)
+{
+	MCDI_DECLARE_BUF(outbuf, MC_CMD_MAE_ENCAP_HEADER_FREE_OUT_LEN(1));
+	MCDI_DECLARE_BUF(inbuf, MC_CMD_MAE_ENCAP_HEADER_FREE_IN_LEN(1));
+	size_t outlen;
+	int rc;
+
+	MCDI_SET_DWORD(inbuf, MAE_ENCAP_HEADER_FREE_IN_EH_ID, encap->fw_id);
+	rc = efx_mcdi_rpc(efx, MC_CMD_MAE_ENCAP_HEADER_FREE, inbuf,
+			  sizeof(inbuf), outbuf, sizeof(outbuf), &outlen);
+	if (rc)
+		return rc;
+	if (outlen < sizeof(outbuf))
+		return -EIO;
+	/* FW freed a different ID than we asked for, should also never happen.
+	 * Warn because it means we've now got a different idea to the FW of
+	 * what encap_mds exist, which could cause mayhem later.
+	 */
+	if (WARN_ON(MCDI_DWORD(outbuf, MAE_ENCAP_HEADER_FREE_OUT_FREED_EH_ID) != encap->fw_id))
+		return -EIO;
+	/* We're probably about to free @encap, but let's just make sure its
+	 * fw_id is blatted so that it won't look valid if it leaks out.
+	 */
+	encap->fw_id = MC_CMD_MAE_ENCAP_HEADER_ALLOC_OUT_ENCAP_HEADER_ID_NULL;
+	return 0;
+}
+
 int efx_mae_lookup_mport(struct efx_nic *efx, u32 vf_idx, u32 *id)
 {
 	struct ef100_nic_data *nic_data = efx->nic_data;
@@ -833,8 +915,12 @@ int efx_mae_alloc_action_set(struct efx_nic *efx, struct efx_tc_action_set *act)
 		MCDI_SET_WORD_BE(inbuf, MAE_ACTION_SET_ALLOC_IN_VLAN1_PROTO_BE,
 				 act->vlan_proto[1]);
 	}
-	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_ENCAP_HEADER_ID,
-		       MC_CMD_MAE_ENCAP_HEADER_ALLOC_OUT_ENCAP_HEADER_ID_NULL);
+	if (act->encap_md)
+		MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_ENCAP_HEADER_ID,
+			       act->encap_md->fw_id);
+	else
+		MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_ENCAP_HEADER_ID,
+			       MC_CMD_MAE_ENCAP_HEADER_ALLOC_OUT_ENCAP_HEADER_ID_NULL);
 	if (act->deliver)
 		MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_DELIVER,
 			       act->dest_mport);

drivers/net/ethernet/sfc/mae.h

@@ -90,6 +90,13 @@ int efx_mae_check_encap_type_supported(struct efx_nic *efx,
 int efx_mae_allocate_counter(struct efx_nic *efx, struct efx_tc_counter *cnt);
 int efx_mae_free_counter(struct efx_nic *efx, struct efx_tc_counter *cnt);
 
+int efx_mae_allocate_encap_md(struct efx_nic *efx,
+			      struct efx_tc_encap_action *encap);
+int efx_mae_update_encap_md(struct efx_nic *efx,
+			    struct efx_tc_encap_action *encap);
+int efx_mae_free_encap_md(struct efx_nic *efx,
+			  struct efx_tc_encap_action *encap);
+
 int efx_mae_alloc_action_set(struct efx_nic *efx, struct efx_tc_action_set *act);
 int efx_mae_free_action_set(struct efx_nic *efx, u32 fw_id);