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Date: Fri, 11 Nov 2022 08:35:20 -0800
From: Jeroen de Borst <jeroendb@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org,
Jeroen de Borst <jeroendb@...gle.com>
Subject: [PATCH net-next v2 1/2] gve: Adding a new AdminQ command to verify driver
Check whether the driver is compatible with the device
presented.
Signed-off-by: Jeroen de Borst <jeroendb@...gle.com>
---
drivers/net/ethernet/google/gve/gve.h | 1 +
drivers/net/ethernet/google/gve/gve_adminq.c | 19 +++++++
drivers/net/ethernet/google/gve/gve_adminq.h | 49 ++++++++++++++++++
drivers/net/ethernet/google/gve/gve_main.c | 52 ++++++++++++++++++++
4 files changed, 121 insertions(+)
diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h
index 5655da9cd236..64eb0442c82f 100644
--- a/drivers/net/ethernet/google/gve/gve.h
+++ b/drivers/net/ethernet/google/gve/gve.h
@@ -563,6 +563,7 @@ struct gve_priv {
u32 adminq_report_stats_cnt;
u32 adminq_report_link_speed_cnt;
u32 adminq_get_ptype_map_cnt;
+ u32 adminq_verify_driver_compatibility_cnt;
/* Global stats */
u32 interface_up_cnt; /* count of times interface turned up since last reset */
diff --git a/drivers/net/ethernet/google/gve/gve_adminq.c b/drivers/net/ethernet/google/gve/gve_adminq.c
index f7621ab672b9..6a12b30a9f87 100644
--- a/drivers/net/ethernet/google/gve/gve_adminq.c
+++ b/drivers/net/ethernet/google/gve/gve_adminq.c
@@ -407,6 +407,9 @@ static int gve_adminq_issue_cmd(struct gve_priv *priv,
case GVE_ADMINQ_GET_PTYPE_MAP:
priv->adminq_get_ptype_map_cnt++;
break;
+ case GVE_ADMINQ_VERIFY_DRIVER_COMPATIBILITY:
+ priv->adminq_verify_driver_compatibility_cnt++;
+ break;
default:
dev_err(&priv->pdev->dev, "unknown AQ command opcode %d\n", opcode);
}
@@ -878,6 +881,22 @@ int gve_adminq_report_stats(struct gve_priv *priv, u64 stats_report_len,
return gve_adminq_execute_cmd(priv, &cmd);
}
+int gve_adminq_verify_driver_compatibility(struct gve_priv *priv,
+ u64 driver_info_len,
+ dma_addr_t driver_info_addr)
+{
+ union gve_adminq_command cmd;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.opcode = cpu_to_be32(GVE_ADMINQ_VERIFY_DRIVER_COMPATIBILITY);
+ cmd.verify_driver_compatibility = (struct gve_adminq_verify_driver_compatibility) {
+ .driver_info_len = cpu_to_be64(driver_info_len),
+ .driver_info_addr = cpu_to_be64(driver_info_addr),
+ };
+
+ return gve_adminq_execute_cmd(priv, &cmd);
+}
+
int gve_adminq_report_link_speed(struct gve_priv *priv)
{
union gve_adminq_command gvnic_cmd;
diff --git a/drivers/net/ethernet/google/gve/gve_adminq.h b/drivers/net/ethernet/google/gve/gve_adminq.h
index 83c0b40cd2d9..b9ee8be73f96 100644
--- a/drivers/net/ethernet/google/gve/gve_adminq.h
+++ b/drivers/net/ethernet/google/gve/gve_adminq.h
@@ -24,6 +24,7 @@ enum gve_adminq_opcodes {
GVE_ADMINQ_REPORT_STATS = 0xC,
GVE_ADMINQ_REPORT_LINK_SPEED = 0xD,
GVE_ADMINQ_GET_PTYPE_MAP = 0xE,
+ GVE_ADMINQ_VERIFY_DRIVER_COMPATIBILITY = 0xF,
};
/* Admin queue status codes */
@@ -146,6 +147,49 @@ enum gve_sup_feature_mask {
#define GVE_DEV_OPT_LEN_GQI_RAW_ADDRESSING 0x0
+#define GVE_VERSION_STR_LEN 128
+
+enum gve_driver_capbility {
+ gve_driver_capability_gqi_qpl = 0,
+ gve_driver_capability_gqi_rda = 1,
+ gve_driver_capability_dqo_qpl = 2, /* reserved for future use */
+ gve_driver_capability_dqo_rda = 3,
+};
+
+#define GVE_CAP1(a) BIT((int)a)
+#define GVE_CAP2(a) BIT(((int)a) - 64)
+#define GVE_CAP3(a) BIT(((int)a) - 128)
+#define GVE_CAP4(a) BIT(((int)a) - 192)
+
+#define GVE_DRIVER_CAPABILITY_FLAGS1 \
+ (GVE_CAP1(gve_driver_capability_gqi_qpl) | \
+ GVE_CAP1(gve_driver_capability_gqi_rda) | \
+ GVE_CAP1(gve_driver_capability_dqo_rda))
+
+#define GVE_DRIVER_CAPABILITY_FLAGS2 0x0
+#define GVE_DRIVER_CAPABILITY_FLAGS3 0x0
+#define GVE_DRIVER_CAPABILITY_FLAGS4 0x0
+
+struct gve_driver_info {
+ u8 os_type; /* 0x01 = Linux */
+ u8 driver_major;
+ u8 driver_minor;
+ u8 driver_sub;
+ __be32 os_version_major;
+ __be32 os_version_minor;
+ __be32 os_version_sub;
+ __be64 driver_capability_flags[4];
+ u8 os_version_str1[GVE_VERSION_STR_LEN];
+ u8 os_version_str2[GVE_VERSION_STR_LEN];
+};
+
+struct gve_adminq_verify_driver_compatibility {
+ __be64 driver_info_len;
+ __be64 driver_info_addr;
+};
+
+static_assert(sizeof(struct gve_adminq_verify_driver_compatibility) == 16);
+
struct gve_adminq_configure_device_resources {
__be64 counter_array;
__be64 irq_db_addr;
@@ -345,6 +389,8 @@ union gve_adminq_command {
struct gve_adminq_report_stats report_stats;
struct gve_adminq_report_link_speed report_link_speed;
struct gve_adminq_get_ptype_map get_ptype_map;
+ struct gve_adminq_verify_driver_compatibility
+ verify_driver_compatibility;
};
};
u8 reserved[64];
@@ -372,6 +418,9 @@ int gve_adminq_unregister_page_list(struct gve_priv *priv, u32 page_list_id);
int gve_adminq_set_mtu(struct gve_priv *priv, u64 mtu);
int gve_adminq_report_stats(struct gve_priv *priv, u64 stats_report_len,
dma_addr_t stats_report_addr, u64 interval);
+int gve_adminq_verify_driver_compatibility(struct gve_priv *priv,
+ u64 driver_info_len,
+ dma_addr_t driver_info_addr);
int gve_adminq_report_link_speed(struct gve_priv *priv);
struct gve_ptype_lut;
diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index 5a229a01f49d..5b40f9c53196 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -12,6 +12,8 @@
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
+#include <linux/utsname.h>
+#include <linux/version.h>
#include <net/sch_generic.h>
#include "gve.h"
#include "gve_dqo.h"
@@ -30,6 +32,49 @@
const char gve_version_str[] = GVE_VERSION;
static const char gve_version_prefix[] = GVE_VERSION_PREFIX;
+static int gve_verify_driver_compatibility(struct gve_priv *priv)
+{
+ int err;
+ struct gve_driver_info *driver_info;
+ dma_addr_t driver_info_bus;
+
+ driver_info = dma_alloc_coherent(&priv->pdev->dev,
+ sizeof(struct gve_driver_info),
+ &driver_info_bus, GFP_KERNEL);
+ if (!driver_info)
+ return -ENOMEM;
+
+ *driver_info = (struct gve_driver_info) {
+ .os_type = 1, /* Linux */
+ .os_version_major = cpu_to_be32(LINUX_VERSION_MAJOR),
+ .os_version_minor = cpu_to_be32(LINUX_VERSION_SUBLEVEL),
+ .os_version_sub = cpu_to_be32(LINUX_VERSION_PATCHLEVEL),
+ .driver_capability_flags = {
+ cpu_to_be64(GVE_DRIVER_CAPABILITY_FLAGS1),
+ cpu_to_be64(GVE_DRIVER_CAPABILITY_FLAGS2),
+ cpu_to_be64(GVE_DRIVER_CAPABILITY_FLAGS3),
+ cpu_to_be64(GVE_DRIVER_CAPABILITY_FLAGS4),
+ },
+ };
+ strscpy(driver_info->os_version_str1, utsname()->release,
+ sizeof(driver_info->os_version_str1));
+ strscpy(driver_info->os_version_str2, utsname()->version,
+ sizeof(driver_info->os_version_str2));
+
+ err = gve_adminq_verify_driver_compatibility(priv,
+ sizeof(struct gve_driver_info),
+ driver_info_bus);
+
+ /* It's ok if the device doesn't support this */
+ if (err == -EOPNOTSUPP)
+ err = 0;
+
+ dma_free_coherent(&priv->pdev->dev,
+ sizeof(struct gve_driver_info),
+ driver_info, driver_info_bus);
+ return err;
+}
+
static netdev_tx_t gve_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct gve_priv *priv = netdev_priv(dev);
@@ -1368,6 +1413,13 @@ static int gve_init_priv(struct gve_priv *priv, bool skip_describe_device)
return err;
}
+ err = gve_verify_driver_compatibility(priv);
+ if (err) {
+ dev_err(&priv->pdev->dev,
+ "Could not verify driver compatibility: err=%d\n", err);
+ goto err;
+ }
+
if (skip_describe_device)
goto setup_device;
--
2.38.1.431.g37b22c650d-goog
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