crypto: octeontx2 - add devlink option to set t106 mode

On CN10KA B0/CN10KB, CPT scatter gather format has modified
to support multi-seg in inline IPsec. Due to this CPT requires
new firmware and doesn't work with CN10KA0/A1 firmware. To make
HW works in backward compatibility mode or works with CN10KA0/A1
firmware, a bit(T106_MODE) is introduced in HW CSR.

This patch adds devlink parameter for configuring T106_MODE.
This patch also documents the devlink parameter under
Documentation/crypto/device_drivers.

Signed-off-by: Srujana Challa <schalla@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/crypto/device_drivers/index.rst

@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Hardware Device Driver Specific Documentation
+---------------------------------------------
+
+.. toctree::
+   :maxdepth: 1
+
+   octeontx2

Documentation/crypto/device_drivers/octeontx2.rst

@@ -0,0 +1,25 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================
+octeontx2 devlink support
+=========================
+
+This document describes the devlink features implemented by the ``octeontx2 CPT``
+device drivers.
+
+Parameters
+==========
+
+The ``octeontx2`` driver implements the following driver-specific parameters.
+
+.. list-table:: Driver-specific parameters implemented
+   :widths: 5 5 5 85
+
+   * - Name
+     - Type
+     - Mode
+     - Description
+   * - ``t106_mode``
+     - u8
+     - runtime
+     - Used to configure CN10KA B0/CN10KB CPT to work as CN10KA A0/A1.

Documentation/crypto/index.rst

@@ -28,3 +28,4 @@ for cryptographic use cases, as well as programming examples.
    api
    api-samples
    descore-readme
+   device_drivers/index

drivers/crypto/marvell/octeontx2/otx2_cpt_common.h

@@ -187,6 +187,14 @@ static inline void otx2_cpt_set_hw_caps(struct pci_dev *pdev,
 }
 
 
+static inline bool cpt_feature_sgv2(struct pci_dev *pdev)
+{
+	if (!is_dev_otx2(pdev) && !is_dev_cn10ka_ax(pdev))
+		return true;
+
+	return false;
+}
+
 int otx2_cpt_send_ready_msg(struct otx2_mbox *mbox, struct pci_dev *pdev);
 int otx2_cpt_send_mbox_msg(struct otx2_mbox *mbox, struct pci_dev *pdev);
 

drivers/crypto/marvell/octeontx2/otx2_cpt_devlink.c

@@ -23,11 +23,46 @@ static int otx2_cpt_dl_egrp_delete(struct devlink *dl, u32 id,
 
 static int otx2_cpt_dl_uc_info(struct devlink *dl, u32 id,
 			       struct devlink_param_gset_ctx *ctx)
+{
+	ctx->val.vstr[0] = '\0';
+
+	return 0;
+}
+
+static int otx2_cpt_dl_t106_mode_get(struct devlink *dl, u32 id,
+				     struct devlink_param_gset_ctx *ctx)
 {
 	struct otx2_cpt_devlink *cpt_dl = devlink_priv(dl);
 	struct otx2_cptpf_dev *cptpf = cpt_dl->cptpf;
+	struct pci_dev *pdev = cptpf->pdev;
+	u64 reg_val = 0;
 
-	otx2_cpt_print_uc_dbg_info(cptpf);
+	otx2_cpt_read_af_reg(&cptpf->afpf_mbox, pdev, CPT_AF_CTL, &reg_val,
+			     BLKADDR_CPT0);
+	ctx->val.vu8 = (reg_val >> 18) & 0x1;
+
+	return 0;
+}
+
+static int otx2_cpt_dl_t106_mode_set(struct devlink *dl, u32 id,
+				     struct devlink_param_gset_ctx *ctx)
+{
+	struct otx2_cpt_devlink *cpt_dl = devlink_priv(dl);
+	struct otx2_cptpf_dev *cptpf = cpt_dl->cptpf;
+	struct pci_dev *pdev = cptpf->pdev;
+	u64 reg_val = 0;
+
+	if (cptpf->enabled_vfs != 0 || cptpf->eng_grps.is_grps_created)
+		return -EPERM;
+
+	if (cpt_feature_sgv2(pdev)) {
+		otx2_cpt_read_af_reg(&cptpf->afpf_mbox, pdev, CPT_AF_CTL,
+				     &reg_val, BLKADDR_CPT0);
+		reg_val &= ~(0x1ULL << 18);
+		reg_val |= ((u64)ctx->val.vu8 & 0x1) << 18;
+		return otx2_cpt_write_af_reg(&cptpf->afpf_mbox, pdev,
+					     CPT_AF_CTL, reg_val, BLKADDR_CPT0);
+	}
 
 	return 0;
 }
@@ -36,6 +71,7 @@ enum otx2_cpt_dl_param_id {
 	OTX2_CPT_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 	OTX2_CPT_DEVLINK_PARAM_ID_EGRP_CREATE,
 	OTX2_CPT_DEVLINK_PARAM_ID_EGRP_DELETE,
+	OTX2_CPT_DEVLINK_PARAM_ID_T106_MODE,
 };
 
 static const struct devlink_param otx2_cpt_dl_params[] = {
@@ -49,6 +85,11 @@ static const struct devlink_param otx2_cpt_dl_params[] = {
 			     BIT(DEVLINK_PARAM_CMODE_RUNTIME),
 			     otx2_cpt_dl_uc_info, otx2_cpt_dl_egrp_delete,
 			     NULL),
+	DEVLINK_PARAM_DRIVER(OTX2_CPT_DEVLINK_PARAM_ID_T106_MODE,
+			     "t106_mode", DEVLINK_PARAM_TYPE_U8,
+			     BIT(DEVLINK_PARAM_CMODE_RUNTIME),
+			     otx2_cpt_dl_t106_mode_get, otx2_cpt_dl_t106_mode_set,
+			     NULL),
 };
 
 static int otx2_cpt_dl_info_firmware_version_put(struct devlink_info_req *req,
@@ -120,7 +161,6 @@ int otx2_cpt_register_dl(struct otx2_cptpf_dev *cptpf)
 		devlink_free(dl);
 		return ret;
 	}
-
 	devlink_register(dl);
 
 	return 0;

drivers/crypto/marvell/octeontx2/otx2_cptpf_main.c

@@ -600,10 +600,10 @@ static void cptpf_get_rid(struct pci_dev *pdev, struct otx2_cptpf_dev *cptpf)
 	}
 	otx2_cpt_read_af_reg(&cptpf->afpf_mbox, pdev, CPT_AF_CTL, &reg_val,
 			     BLKADDR_CPT0);
-	if ((is_dev_cn10ka_b0(pdev) && (reg_val & BIT_ULL(18))) ||
+	if ((cpt_feature_sgv2(pdev) && (reg_val & BIT_ULL(18))) ||
 	    is_dev_cn10ka_ax(pdev))
 		eng_grps->rid = CPT_UC_RID_CN10K_A;
-	else if (is_dev_cn10kb(pdev) || is_dev_cn10ka_b0(pdev))
+	else if (cpt_feature_sgv2(pdev))
 		eng_grps->rid = CPT_UC_RID_CN10K_B;
 }