be2net: Support UE recovery in BEx/Skyhawk adapters

This patch supports recovery from UEs caused due to Transient Parity
Errors (TPE), in BE2, BE3 and Skyhawk adapters. This change avoids
system reboot when such errors occur. The driver recovers from these
errors such that the adapter resumes full operational status as prior
to the UE.

Following is the list of changes in the driver to support this:

o The driver registers its UE recoverable capability with ARM FW at init
time. This also allows the driver to know if the feature is supported in
the FW.

o As the UE recovery requires precise time bound processing, the driver
creates its own error recovery work queue with a single worker thread (per
module, shared across functions).

o Each function runs an error detection task at an interval of 1 second as
required by the FW. The error detection logic already exists for BEx/SH,
but it now runs in the context of a separate worker thread.

o When an error is detected by the task, if it is recoverable, the PF0
driver instance initiates a soft reset, while other PF driver instances
wait for the reset to complete and the chip to become ready. Once
the chip is ready, all driver instances including PF0, resume to
reinitialize the respective functions.

o The PF0 driver checks for some recovery criteria, to determine if the
recovery can be initiated. If the criteria is not met, the PF0 driver does
not initiate a soft reset, it retains the existing behavior to stop
further processing and requires a reboot to get the chip to operational
state again.

o To allow each function to share the workq, while also making progress in
its recovery process, a per-function recovery state machine is used.
The per-function tasks avoid blocking operations like msleep() while in
this state machine (until reinit state) and instead reschedule for the
required delay.

o With these changes, the existing error recovery code for Lancer also
runs in the context of the new worker thread.

Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 1 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.h b/drivers/net/ethernet/emulex/benet/be_cmds.h
index 0d6be224a787..686cbe03e368 100644
--- a/drivers/net/ethernet/emulex/benet/be_cmds.h
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.h
@@ -58,7 +58,8 @@ enum mcc_base_status {
 	MCC_STATUS_INSUFFICIENT_BUFFER = 4,
 	MCC_STATUS_UNAUTHORIZED_REQUEST = 5,
 	MCC_STATUS_NOT_SUPPORTED = 66,
-	MCC_STATUS_FEATURE_NOT_SUPPORTED = 68
+	MCC_STATUS_FEATURE_NOT_SUPPORTED = 68,
+	MCC_STATUS_INVALID_LENGTH = 116
 };
 
 /* Additional status */
@@ -308,6 +309,7 @@ struct be_mcc_mailbox {
 #define OPCODE_COMMON_READ_OBJECT			171
 #define OPCODE_COMMON_WRITE_OBJECT			172
 #define OPCODE_COMMON_DELETE_OBJECT			174
+#define OPCODE_COMMON_SET_FEATURES			191
 #define OPCODE_COMMON_MANAGE_IFACE_FILTERS		193
 #define OPCODE_COMMON_GET_IFACE_LIST			194
 #define OPCODE_COMMON_ENABLE_DISABLE_VF			196
@@ -2315,6 +2317,41 @@ struct be_cmd_resp_get_iface_list {
 	struct be_if_desc if_desc;
 };
 
+/************** Set Features *******************/
+#define	BE_FEATURE_UE_RECOVERY		0x10
+#define	BE_UE_RECOVERY_UER_MASK		0x1
+
+struct be_req_ue_recovery {
+	u32	uer;
+	u32	rsvd;
+};
+
+struct be_cmd_req_set_features {
+	struct be_cmd_req_hdr hdr;
+	u32 features;
+	u32 parameter_len;
+	union {
+		struct be_req_ue_recovery req;
+		u32 rsvd[2];
+	} parameter;
+};
+
+struct be_resp_ue_recovery {
+	u32 uer;
+	u16 ue2rp;
+	u16 ue2sr;
+};
+
+struct be_cmd_resp_set_features {
+	struct be_cmd_resp_hdr hdr;
+	u32 features;
+	u32 parameter_len;
+	union {
+		struct be_resp_ue_recovery resp;
+		u32 rsvd[2];
+	} parameter;
+};
+
 /*************** Set logical link ********************/
 #define PLINK_ENABLE            BIT(0)
 #define PLINK_TRACK             BIT(8)
@@ -2343,6 +2380,7 @@ struct be_cmd_req_manage_iface_filters {
 	u32 cap_control_flags;
 } __packed;
 
+u16 be_POST_stage_get(struct be_adapter *adapter);
 int be_pci_fnum_get(struct be_adapter *adapter);
 int be_fw_wait_ready(struct be_adapter *adapter);
 int be_cmd_mac_addr_query(struct be_adapter *adapter, u8 *mac_addr,
@@ -2470,3 +2508,4 @@ int be_cmd_manage_iface(struct be_adapter *adapter, u32 iface, u8 op);
 int be_cmd_set_sriov_config(struct be_adapter *adapter,
 			    struct be_resources res, u16 num_vfs,
 			    struct be_resources *vft_res);
+int be_cmd_set_features(struct be_adapter *adapter);