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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/* Google virtual Ethernet (gve) driver
*
* Copyright (C) 2015-2019 Google, Inc.
*/
#include <linux/etherdevice.h>
#include <linux/pci.h>
#include "gve.h"
#include "gve_adminq.h"
#include "gve_register.h"
#define GVE_MAX_ADMINQ_RELEASE_CHECK 500
#define GVE_ADMINQ_SLEEP_LEN 20
#define GVE_MAX_ADMINQ_EVENT_COUNTER_CHECK 100
int gve_adminq_alloc(struct device *dev, struct gve_priv *priv)
{
priv->adminq = dma_alloc_coherent(dev, PAGE_SIZE,
&priv->adminq_bus_addr, GFP_KERNEL);
if (unlikely(!priv->adminq))
return -ENOMEM;
priv->adminq_mask = (PAGE_SIZE / sizeof(union gve_adminq_command)) - 1;
priv->adminq_prod_cnt = 0;
/* Setup Admin queue with the device */
iowrite32be(priv->adminq_bus_addr / PAGE_SIZE,
&priv->reg_bar0->adminq_pfn);
gve_set_admin_queue_ok(priv);
return 0;
}
void gve_adminq_release(struct gve_priv *priv)
{
int i = 0;
/* Tell the device the adminq is leaving */
iowrite32be(0x0, &priv->reg_bar0->adminq_pfn);
while (ioread32be(&priv->reg_bar0->adminq_pfn)) {
/* If this is reached the device is unrecoverable and still
* holding memory. Continue looping to avoid memory corruption,
* but WARN so it is visible what is going on.
*/
if (i == GVE_MAX_ADMINQ_RELEASE_CHECK)
WARN(1, "Unrecoverable platform error!");
i++;
msleep(GVE_ADMINQ_SLEEP_LEN);
}
gve_clear_device_rings_ok(priv);
gve_clear_device_resources_ok(priv);
gve_clear_admin_queue_ok(priv);
}
void gve_adminq_free(struct device *dev, struct gve_priv *priv)
{
if (!gve_get_admin_queue_ok(priv))
return;
gve_adminq_release(priv);
dma_free_coherent(dev, PAGE_SIZE, priv->adminq, priv->adminq_bus_addr);
gve_clear_admin_queue_ok(priv);
}
static void gve_adminq_kick_cmd(struct gve_priv *priv, u32 prod_cnt)
{
iowrite32be(prod_cnt, &priv->reg_bar0->adminq_doorbell);
}
static bool gve_adminq_wait_for_cmd(struct gve_priv *priv, u32 prod_cnt)
{
int i;
for (i = 0; i < GVE_MAX_ADMINQ_EVENT_COUNTER_CHECK; i++) {
if (ioread32be(&priv->reg_bar0->adminq_event_counter)
== prod_cnt)
return true;
msleep(GVE_ADMINQ_SLEEP_LEN);
}
return false;
}
static int gve_adminq_parse_err(struct device *dev, u32 status)
{
if (status != GVE_ADMINQ_COMMAND_PASSED &&
status != GVE_ADMINQ_COMMAND_UNSET)
dev_err(dev, "AQ command failed with status %d\n", status);
switch (status) {
case GVE_ADMINQ_COMMAND_PASSED:
return 0;
case GVE_ADMINQ_COMMAND_UNSET:
dev_err(dev, "parse_aq_err: err and status both unset, this should not be possible.\n");
return -EINVAL;
case GVE_ADMINQ_COMMAND_ERROR_ABORTED:
case GVE_ADMINQ_COMMAND_ERROR_CANCELLED:
case GVE_ADMINQ_COMMAND_ERROR_DATALOSS:
case GVE_ADMINQ_COMMAND_ERROR_FAILED_PRECONDITION:
case GVE_ADMINQ_COMMAND_ERROR_UNAVAILABLE:
return -EAGAIN;
case GVE_ADMINQ_COMMAND_ERROR_ALREADY_EXISTS:
case GVE_ADMINQ_COMMAND_ERROR_INTERNAL_ERROR:
case GVE_ADMINQ_COMMAND_ERROR_INVALID_ARGUMENT:
case GVE_ADMINQ_COMMAND_ERROR_NOT_FOUND:
case GVE_ADMINQ_COMMAND_ERROR_OUT_OF_RANGE:
case GVE_ADMINQ_COMMAND_ERROR_UNKNOWN_ERROR:
return -EINVAL;
case GVE_ADMINQ_COMMAND_ERROR_DEADLINE_EXCEEDED:
return -ETIME;
case GVE_ADMINQ_COMMAND_ERROR_PERMISSION_DENIED:
case GVE_ADMINQ_COMMAND_ERROR_UNAUTHENTICATED:
return -EACCES;
case GVE_ADMINQ_COMMAND_ERROR_RESOURCE_EXHAUSTED:
return -ENOMEM;
case GVE_ADMINQ_COMMAND_ERROR_UNIMPLEMENTED:
return -ENOTSUPP;
default:
dev_err(dev, "parse_aq_err: unknown status code %d\n", status);
return -EINVAL;
}
}
/* This function is not threadsafe - the caller is responsible for any
* necessary locks.
*/
int gve_adminq_execute_cmd(struct gve_priv *priv,
union gve_adminq_command *cmd_orig)
{
union gve_adminq_command *cmd;
u32 status = 0;
u32 prod_cnt;
cmd = &priv->adminq[priv->adminq_prod_cnt & priv->adminq_mask];
priv->adminq_prod_cnt++;
prod_cnt = priv->adminq_prod_cnt;
memcpy(cmd, cmd_orig, sizeof(*cmd_orig));
gve_adminq_kick_cmd(priv, prod_cnt);
if (!gve_adminq_wait_for_cmd(priv, prod_cnt)) {
dev_err(&priv->pdev->dev, "AQ command timed out, need to reset AQ\n");
return -ENOTRECOVERABLE;
}
memcpy(cmd_orig, cmd, sizeof(*cmd));
status = be32_to_cpu(READ_ONCE(cmd->status));
return gve_adminq_parse_err(&priv->pdev->dev, status);
}
/* The device specifies that the management vector can either be the first irq
* or the last irq. ntfy_blk_msix_base_idx indicates the first irq assigned to
* the ntfy blks. It if is 0 then the management vector is last, if it is 1 then
* the management vector is first.
*
* gve arranges the msix vectors so that the management vector is last.
*/
#define GVE_NTFY_BLK_BASE_MSIX_IDX 0
int gve_adminq_configure_device_resources(struct gve_priv *priv,
dma_addr_t counter_array_bus_addr,
u32 num_counters,
dma_addr_t db_array_bus_addr,
u32 num_ntfy_blks)
{
union gve_adminq_command cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = cpu_to_be32(GVE_ADMINQ_CONFIGURE_DEVICE_RESOURCES);
cmd.configure_device_resources =
(struct gve_adminq_configure_device_resources) {
.counter_array = cpu_to_be64(counter_array_bus_addr),
.num_counters = cpu_to_be32(num_counters),
.irq_db_addr = cpu_to_be64(db_array_bus_addr),
.num_irq_dbs = cpu_to_be32(num_ntfy_blks),
.irq_db_stride = cpu_to_be32(sizeof(priv->ntfy_blocks[0])),
.ntfy_blk_msix_base_idx =
cpu_to_be32(GVE_NTFY_BLK_BASE_MSIX_IDX),
};
return gve_adminq_execute_cmd(priv, &cmd);
}
int gve_adminq_deconfigure_device_resources(struct gve_priv *priv)
{
union gve_adminq_command cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = cpu_to_be32(GVE_ADMINQ_DECONFIGURE_DEVICE_RESOURCES);
return gve_adminq_execute_cmd(priv, &cmd);
}
int gve_adminq_describe_device(struct gve_priv *priv)
{
struct gve_device_descriptor *descriptor;
union gve_adminq_command cmd;
dma_addr_t descriptor_bus;
int err = 0;
u8 *mac;
u16 mtu;
memset(&cmd, 0, sizeof(cmd));
descriptor = dma_alloc_coherent(&priv->pdev->dev, PAGE_SIZE,
&descriptor_bus, GFP_KERNEL);
if (!descriptor)
return -ENOMEM;
cmd.opcode = cpu_to_be32(GVE_ADMINQ_DESCRIBE_DEVICE);
cmd.describe_device.device_descriptor_addr =
cpu_to_be64(descriptor_bus);
cmd.describe_device.device_descriptor_version =
cpu_to_be32(GVE_ADMINQ_DEVICE_DESCRIPTOR_VERSION);
cmd.describe_device.available_length = cpu_to_be32(PAGE_SIZE);
err = gve_adminq_execute_cmd(priv, &cmd);
if (err)
goto free_device_descriptor;
mtu = be16_to_cpu(descriptor->mtu);
if (mtu < ETH_MIN_MTU) {
netif_err(priv, drv, priv->dev, "MTU %d below minimum MTU\n",
mtu);
err = -EINVAL;
goto free_device_descriptor;
}
priv->dev->max_mtu = mtu;
priv->num_event_counters = be16_to_cpu(descriptor->counters);
ether_addr_copy(priv->dev->dev_addr, descriptor->mac);
mac = descriptor->mac;
netif_info(priv, drv, priv->dev, "MAC addr: %pM\n", mac);
free_device_descriptor:
dma_free_coherent(&priv->pdev->dev, sizeof(*descriptor), descriptor,
descriptor_bus);
return err;
}
int gve_adminq_set_mtu(struct gve_priv *priv, u64 mtu)
{
union gve_adminq_command cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = cpu_to_be32(GVE_ADMINQ_SET_DRIVER_PARAMETER);
cmd.set_driver_param = (struct gve_adminq_set_driver_parameter) {
.parameter_type = cpu_to_be32(GVE_SET_PARAM_MTU),
.parameter_value = cpu_to_be64(mtu),
};
return gve_adminq_execute_cmd(priv, &cmd);
}
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