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Message-ID: <20230406234143.11318-13-shannon.nelson@amd.com>
Date: Thu, 6 Apr 2023 16:41:41 -0700
From: Shannon Nelson <shannon.nelson@....com>
To: <shannon.nelson@....com>, <brett.creeley@....com>,
<davem@...emloft.net>, <netdev@...r.kernel.org>, <kuba@...nel.org>
CC: <drivers@...sando.io>, <leon@...nel.org>, <jiri@...nulli.us>
Subject: [PATCH v9 net-next 12/14] pds_core: add the aux client API
Add the client API operations for running adminq commands.
The core registers the client with the FW, then the client
has a context for requesting adminq services. We expect
to add additional operations for other clients, including
requesting additional private adminqs and IRQs, but don't have
the need yet.
Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
drivers/net/ethernet/amd/pds_core/auxbus.c | 135 ++++++++++++++++++++-
include/linux/pds/pds_auxbus.h | 28 +++++
2 files changed, 160 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/amd/pds_core/auxbus.c b/drivers/net/ethernet/amd/pds_core/auxbus.c
index 6757a5174eb7..c8c5cc5c9ca6 100644
--- a/drivers/net/ethernet/amd/pds_core/auxbus.c
+++ b/drivers/net/ethernet/amd/pds_core/auxbus.c
@@ -6,6 +6,115 @@
#include "core.h"
#include <linux/pds/pds_auxbus.h>
+static int pds_client_register(struct pdsc *vf, struct pdsc *pf, char *name)
+{
+ union pds_core_adminq_comp comp = { 0 };
+ union pds_core_adminq_cmd cmd = { 0 };
+ int err;
+ u16 ci;
+
+ if (pf->state)
+ return -ENXIO;
+
+ cmd.client_reg.opcode = PDS_AQ_CMD_CLIENT_REG;
+ snprintf(cmd.client_reg.devname, sizeof(cmd.client_reg.devname),
+ "%s.%s.%d", PDS_CORE_DRV_NAME, name, vf->uid);
+
+ err = pdsc_adminq_post(pf, &cmd, &comp, false);
+ if (err) {
+ dev_info(pf->dev, "register dev_name %s with DSC failed, status %d: %pe\n",
+ name, comp.status, ERR_PTR(err));
+ return err;
+ }
+
+ ci = le16_to_cpu(comp.client_reg.client_id);
+ if (!ci) {
+ dev_err(pf->dev, "%s: device returned null client_id\n",
+ __func__);
+ return -EIO;
+ }
+
+ dev_dbg(pf->dev, "%s: device returned client_id %d for %s\n",
+ __func__, ci, cmd.client_reg.devname);
+
+ return ci;
+}
+
+static int pds_client_unregister(struct pdsc *pf, u16 client_id)
+{
+ union pds_core_adminq_comp comp = { 0 };
+ union pds_core_adminq_cmd cmd = { 0 };
+ int err;
+
+ if (pf->state)
+ return -ENXIO;
+
+ cmd.client_unreg.opcode = PDS_AQ_CMD_CLIENT_UNREG;
+ cmd.client_unreg.client_id = cpu_to_le16(client_id);
+
+ err = pdsc_adminq_post(pf, &cmd, &comp, false);
+ if (err)
+ dev_info(pf->dev, "unregister client_id %d failed, status %d: %pe\n",
+ client_id, comp.status, ERR_PTR(err));
+
+ return err;
+}
+
+/**
+ * pds_client_adminq_cmd - Process an adminq request for the client
+ * @padev: ptr to the client device
+ * @req: ptr to buffer with request
+ * @req_len: length of actual struct used for request
+ * @resp: ptr to buffer where answer is to be copied
+ * @flags: optional flags from pds_core_adminq_flags
+ *
+ * Return: 0 on success, or
+ * negative for error
+ *
+ * Client sends pointers to request and response buffers
+ * Core copies request data into pds_core_client_request_cmd
+ * Core sets other fields as needed
+ * Core posts to AdminQ
+ * Core copies completion data into response buffer
+ */
+static int pds_client_adminq_cmd(struct pds_auxiliary_dev *padev,
+ union pds_core_adminq_cmd *req,
+ size_t req_len,
+ union pds_core_adminq_comp *resp,
+ u64 flags)
+{
+ union pds_core_adminq_cmd cmd = { 0 };
+ struct pdsc *pf;
+ size_t cp_len;
+ int err;
+
+ pf = pci_get_drvdata(padev->pf_pdev);
+
+ dev_dbg(pf->dev, "%s: %s opcode %d\n",
+ __func__, dev_name(&padev->aux_dev.dev), req->opcode);
+
+ if (pf->state)
+ return -ENXIO;
+
+ /* Wrap the client's request */
+ cmd.client_request.opcode = PDS_AQ_CMD_CLIENT_CMD;
+ cmd.client_request.client_id = cpu_to_le16(padev->client_id);
+ cp_len = min_t(size_t, req_len, sizeof(cmd.client_request.client_cmd));
+ memcpy(cmd.client_request.client_cmd, req, cp_len);
+
+ err = pdsc_adminq_post(pf, &cmd, resp,
+ !!(flags & PDS_AQ_FLAG_FASTPOLL));
+ if (err && err != -EAGAIN)
+ dev_info(pf->dev, "client admin cmd failed: %pe\n",
+ ERR_PTR(err));
+
+ return err;
+}
+
+static struct pds_core_ops pds_core_ops = {
+ .adminq_cmd = pds_client_adminq_cmd,
+};
+
static void pdsc_auxbus_dev_release(struct device *dev)
{
struct pds_auxiliary_dev *padev =
@@ -16,7 +125,9 @@ static void pdsc_auxbus_dev_release(struct device *dev)
static struct pds_auxiliary_dev *pdsc_auxbus_dev_register(struct pdsc *vf,
struct pdsc *pf,
- char *name)
+ u16 client_id,
+ char *name,
+ struct pds_core_ops *ops)
{
struct auxiliary_device *aux_dev;
struct pds_auxiliary_dev *padev;
@@ -28,6 +139,8 @@ static struct pds_auxiliary_dev *pdsc_auxbus_dev_register(struct pdsc *vf,
padev->vf_pdev = vf->pdev;
padev->pf_pdev = pf->pdev;
+ padev->ops = ops;
+ padev->client_id = client_id;
aux_dev = &padev->aux_dev;
aux_dev->name = name;
@@ -67,8 +180,10 @@ int pdsc_auxbus_dev_del_vf(struct pdsc *vf, struct pdsc *pf)
padev = pf->vfs[vf->vf_id].padev;
if (padev) {
+ pds_client_unregister(pf, padev->client_id);
auxiliary_device_delete(&padev->aux_dev);
auxiliary_device_uninit(&padev->aux_dev);
+ padev->client_id = 0;
}
pf->vfs[vf->vf_id].padev = NULL;
@@ -80,6 +195,7 @@ int pdsc_auxbus_dev_add_vf(struct pdsc *vf, struct pdsc *pf)
{
struct pds_auxiliary_dev *padev;
enum pds_core_vif_types vt;
+ int client_id;
int err = 0;
mutex_lock(&pf->config_lock);
@@ -94,9 +210,22 @@ int pdsc_auxbus_dev_add_vf(struct pdsc *vf, struct pdsc *pf)
pf->viftype_status[vt].enabled))
continue;
- padev = pdsc_auxbus_dev_register(vf, pf,
- pf->viftype_status[vt].name);
+ /* need to register with FW and get the client_id before
+ * creating the aux device so that the aux client can run
+ * adminq commands as part its probe
+ */
+ client_id = pds_client_register(vf, pf,
+ pf->viftype_status[vt].name);
+ if (client_id < 0) {
+ err = client_id;
+ goto out_unlock;
+ }
+
+ padev = pdsc_auxbus_dev_register(vf, pf, client_id,
+ pf->viftype_status[vt].name,
+ &pds_core_ops);
if (IS_ERR(padev)) {
+ pds_client_unregister(pf, client_id);
err = PTR_ERR(padev);
goto out_unlock;
}
diff --git a/include/linux/pds/pds_auxbus.h b/include/linux/pds/pds_auxbus.h
index aa0192af4a29..f98efd578e1c 100644
--- a/include/linux/pds/pds_auxbus.h
+++ b/include/linux/pds/pds_auxbus.h
@@ -10,7 +10,35 @@ struct pds_auxiliary_dev {
struct auxiliary_device aux_dev;
struct pci_dev *vf_pdev;
struct pci_dev *pf_pdev;
+ struct pds_core_ops *ops;
u16 client_id;
void *priv;
};
+
+/*
+ * ptrs to functions to be used by the client for core services
+ */
+struct pds_core_ops {
+ /* .adminq_cmd() - process an adminq request for the client
+ * padev: ptr to the client device
+ * req: ptr to buffer with request
+ * req_len: length of actual struct used for request
+ * resp: ptr to buffer where answer is to be copied
+ * flags: optional flags defined by enum pds_core_adminq_flags
+ * and used for more flexible adminq behvior
+ *
+ * returns 0 on success, or
+ * negative for error
+ * Client sends pointers to request and response buffers
+ * Core copies request data into pds_core_client_request_cmd
+ * Core sets other fields as needed
+ * Core posts to AdminQ
+ * Core copies completion data into response buffer
+ */
+ int (*adminq_cmd)(struct pds_auxiliary_dev *padev,
+ union pds_core_adminq_cmd *req,
+ size_t req_len,
+ union pds_core_adminq_comp *resp,
+ u64 flags);
+};
#endif /* _PDSC_AUXBUS_H_ */
--
2.17.1
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