@@ -704,6 +704,49 @@ static unsigned int efx_ef100_recycle_ring_size(const struct efx_nic *efx)
return 10 * EFX_RECYCLE_RING_SIZE_10G;
}
+/* BAR configuration */
+static ssize_t bar_config_show(struct device *dev,
+ struct device_attribute *attr, char *buf_out)
+{
+ struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
+ struct ef100_nic_data *nic_data = efx->nic_data;
+
+ switch (nic_data->bar_config) {
+ case EF100_BAR_CONFIG_EF100:
+ sprintf(buf_out, "EF100\n");
+ break;
+ case EF100_BAR_CONFIG_VDPA:
+ sprintf(buf_out, "vDPA\n");
+ break;
+ default: /* this should not happen */
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+
+ return strlen(buf_out);
+}
+
+static ssize_t bar_config_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev));
+ struct ef100_nic_data *nic_data = efx->nic_data;
+ enum ef100_bar_config new_config;
+
+ if (!strncasecmp(buf, "ef100", min_t(size_t, count, 5)))
+ new_config = EF100_BAR_CONFIG_EF100;
+ else if (!strncasecmp(buf, "vdpa", min_t(size_t, count, 4)))
+ new_config = EF100_BAR_CONFIG_VDPA;
+ else
+ return -EIO;
+
+ nic_data->bar_config = new_config;
+ return count;
+}
+
+static DEVICE_ATTR_RW(bar_config);
+
static int compare_versions(const char *a, const char *b)
{
int a_major, a_minor, a_point, a_patch;
@@ -1039,6 +1082,7 @@ static int ef100_probe_main(struct efx_nic *efx)
goto fail;
}
+ device_create_file(&efx->pci_dev->dev, &dev_attr_bar_config);
return 0;
fail:
return rc;
@@ -1072,6 +1116,7 @@ void ef100_remove(struct efx_nic *efx)
{
struct ef100_nic_data *nic_data = efx->nic_data;
+ device_remove_file(&efx->pci_dev->dev, &dev_attr_bar_config);
efx_mcdi_detach(efx);
efx_mcdi_fini(efx);
if (nic_data)
@@ -61,6 +61,11 @@ enum {
EF100_STAT_COUNT
};
+enum ef100_bar_config {
+ EF100_BAR_CONFIG_EF100,
+ EF100_BAR_CONFIG_VDPA,
+};
+
struct ef100_nic_data {
struct efx_nic *efx;
struct efx_buffer mcdi_buf;
@@ -70,6 +75,7 @@ struct ef100_nic_data {
unsigned int pf_index;
u16 warm_boot_count;
u8 port_id[ETH_ALEN];
+ enum ef100_bar_config bar_config;
DECLARE_BITMAP(evq_phases, EFX_MAX_CHANNELS);
u64 stats[EF100_STAT_COUNT];
u16 tso_max_hdr_len;
Provide a "bar_config" file in the sysfs directory of the PCI device. This can be used to switch the PCI BAR layout to/from vDPA mode. Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com> --- drivers/net/ethernet/sfc/ef100_nic.c | 45 ++++++++++++++++++++++++++++++++++ drivers/net/ethernet/sfc/ef100_nic.h | 6 +++++ 2 files changed, 51 insertions(+)