be2net: Add MCC queue mechanism for BE cmds

Currenlty all cmds use the blocking MCC mbox to post cmds. An mbox cmd is protected
via a spin_lock(cmd_lock) and not spin_lock_bh() as it is undesirable
to disable BHs while a blocking mbox cmd is in progress (and take long to finish.)
This can lockup a cmd in progress in process context. Instead cmds that may be
called in BH context must use the MCC queue to post cmds. The cmd completions
are rcvd in a separate completion queue and the events are placed in the tx-event
queue.

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 39 insertions, 1 deletions

diff --git a/drivers/net/benet/be_cmds.h b/drivers/net/benet/be_cmds.h
index e499e2d5b8c..0a9189defc2 100644
--- a/drivers/net/benet/be_cmds.h
+++ b/drivers/net/benet/be_cmds.h
@@ -101,6 +101,7 @@ struct be_mcc_mailbox {
 #define OPCODE_COMMON_FIRMWARE_CONFIG                   42
 #define OPCODE_COMMON_NTWK_INTERFACE_CREATE             50
 #define OPCODE_COMMON_NTWK_INTERFACE_DESTROY            51
+#define OPCODE_COMMON_MCC_DESTROY                       53
 #define OPCODE_COMMON_CQ_DESTROY                        54
 #define OPCODE_COMMON_EQ_DESTROY                        55
 #define OPCODE_COMMON_QUERY_FIRMWARE_CONFIG             58
@@ -269,6 +270,38 @@ struct be_cmd_resp_cq_create {
         u16 rsvd0;
 } __packed;
 
+/******************** Create MCCQ ***************************/
+/* Pseudo amap definition in which each bit of the actual structure is defined
+ * as a byte: used to calculate offset/shift/mask of each field */
+struct amap_mcc_context {
+        u8 con_index[14];
+        u8 rsvd0[2];
+        u8 ring_size[4];
+        u8 fetch_wrb;
+        u8 fetch_r2t;
+        u8 cq_id[10];
+        u8 prod_index[14];
+        u8 fid[8];
+        u8 pdid[9];
+        u8 valid;
+        u8 rsvd1[32];
+        u8 rsvd2[32];
+} __packed;
+
+struct be_cmd_req_mcc_create {
+        struct be_cmd_req_hdr hdr;
+        u16 num_pages;
+        u16 rsvd0;
+        u8 context[sizeof(struct amap_mcc_context) / 8];
+        struct phys_addr pages[8];
+} __packed;
+
+struct be_cmd_resp_mcc_create {
+        struct be_cmd_resp_hdr hdr;
+        u16 id;
+        u16 rsvd0;
+} __packed;
+
 /******************** Create TxQ ***************************/
 #define BE_ETH_TX_RING_TYPE_STANDARD            2
 #define BE_ULP1_NUM                             1
@@ -341,7 +374,8 @@ enum {
         QTYPE_EQ = 1,
         QTYPE_CQ,
         QTYPE_TXQ,
-        QTYPE_RXQ
+        QTYPE_RXQ,
+        QTYPE_MCCQ
 };
 
 struct be_cmd_req_q_destroy {
@@ -657,6 +691,9 @@ extern int be_cmd_cq_create(struct be_ctrl_info *ctrl,
                         struct be_queue_info *cq, struct be_queue_info *eq,
                         bool sol_evts, bool no_delay,
                         int num_cqe_dma_coalesce);
+extern int be_cmd_mccq_create(struct be_ctrl_info *ctrl,
+                        struct be_queue_info *mccq,
+                        struct be_queue_info *cq);
 extern int be_cmd_txq_create(struct be_ctrl_info *ctrl,
                         struct be_queue_info *txq,
                         struct be_queue_info *cq);
@@ -686,3 +723,4 @@ extern int be_cmd_set_flow_control(struct be_ctrl_info *ctrl,
 extern int be_cmd_get_flow_control(struct be_ctrl_info *ctrl,
                         u32 *tx_fc, u32 *rx_fc);
 extern int be_cmd_query_fw_cfg(struct be_ctrl_info *ctrl, u32 *port_num);
+extern void be_process_mcc(struct be_ctrl_info *ctrl);