[PATCH V8 net-next 06/22] net-next/hinic: Add api cmd commands

From: Aviad Krawczyk
Date: Mon Aug 21 2017 - 12:12:55 EST

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Add the api cmd commands for sending management messages to the nic.

Signed-off-by: Aviad Krawczyk <aviad.krawczyk@xxxxxxxxxx>
Signed-off-by: Zhao Chen <zhaochen6@xxxxxxxxxx>
---
.../net/ethernet/huawei/hinic/hinic_hw_api_cmd.c | 329 ++++++++++++++++++++-
.../net/ethernet/huawei/hinic/hinic_hw_api_cmd.h | 65 ++++
drivers/net/ethernet/huawei/hinic/hinic_hw_csr.h | 6 +
3 files changed, 398 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.c b/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.c
index 7e7a76e..8901801 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.c
@@ -25,7 +25,9 @@
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <linux/log2.h>
+#include <linux/semaphore.h>
#include <asm/byteorder.h>
+#include <asm/barrier.h>

#include "hinic_hw_csr.h"
#include "hinic_hw_if.h"
@@ -45,14 +47,313 @@

#define API_CMD_BUF_SIZE 2048

+/* Sizes of the members in hinic_api_cmd_cell */
+#define API_CMD_CELL_DESC_SIZE 8
+#define API_CMD_CELL_DATA_ADDR_SIZE 8
+
+#define API_CMD_CELL_ALIGNMENT 8
+
#define API_CMD_TIMEOUT 1000

+#define MASKED_IDX(chain, idx) ((idx) & ((chain)->num_cells - 1))
+
+#define SIZE_8BYTES(size) (ALIGN((size), 8) >> 3)
+#define SIZE_4BYTES(size) (ALIGN((size), 4) >> 2)
+
+#define RD_DMA_ATTR_DEFAULT 0
+#define WR_DMA_ATTR_DEFAULT 0
+
+enum api_cmd_data_format {
+ SGE_DATA = 1, /* cell data is passed by hw address */
+};
+
+enum api_cmd_type {
+ API_CMD_WRITE = 0,
+};
+
+enum api_cmd_bypass {
+ NO_BYPASS = 0,
+ BYPASS = 1,
+};
+
enum api_cmd_xor_chk_level {
XOR_CHK_DIS = 0,

XOR_CHK_ALL = 3,
};

+static u8 xor_chksum_set(void *data)
+{
+ int idx;
+ u8 *val, checksum = 0;
+
+ val = data;
+
+ for (idx = 0; idx < 7; idx++)
+ checksum ^= val[idx];
+
+ return checksum;
+}
+
+static void set_prod_idx(struct hinic_api_cmd_chain *chain)
+{
+ enum hinic_api_cmd_chain_type chain_type = chain->chain_type;
+ struct hinic_hwif *hwif = chain->hwif;
+ u32 addr, prod_idx;
+
+ addr = HINIC_CSR_API_CMD_CHAIN_PI_ADDR(chain_type);
+ prod_idx = hinic_hwif_read_reg(hwif, addr);
+
+ prod_idx = HINIC_API_CMD_PI_CLEAR(prod_idx, IDX);
+
+ prod_idx |= HINIC_API_CMD_PI_SET(chain->prod_idx, IDX);
+
+ hinic_hwif_write_reg(hwif, addr, prod_idx);
+}
+
+static u32 get_hw_cons_idx(struct hinic_api_cmd_chain *chain)
+{
+ u32 addr, val;
+
+ addr = HINIC_CSR_API_CMD_STATUS_ADDR(chain->chain_type);
+ val = hinic_hwif_read_reg(chain->hwif, addr);
+
+ return HINIC_API_CMD_STATUS_GET(val, CONS_IDX);
+}
+
+/**
+ * chain_busy - check if the chain is still processing last requests
+ * @chain: chain to check
+ *
+ * Return 0 - Success, negative - Failure
+ **/
+static int chain_busy(struct hinic_api_cmd_chain *chain)
+{
+ struct hinic_hwif *hwif = chain->hwif;
+ struct pci_dev *pdev = hwif->pdev;
+ u32 prod_idx;
+
+ switch (chain->chain_type) {
+ case HINIC_API_CMD_WRITE_TO_MGMT_CPU:
+ chain->cons_idx = get_hw_cons_idx(chain);
+ prod_idx = chain->prod_idx;
+
+ /* check for a space for a new command */
+ if (chain->cons_idx == MASKED_IDX(chain, prod_idx + 1)) {
+ dev_err(&pdev->dev, "API CMD chain %d is busy\n",
+ chain->chain_type);
+ return -EBUSY;
+ }
+ break;
+
+ default:
+ dev_err(&pdev->dev, "Unknown API CMD Chain type\n");
+ break;
+ }
+
+ return 0;
+}
+
+/**
+ * get_cell_data_size - get the data size of a specific cell type
+ * @type: chain type
+ *
+ * Return the data(Desc + Address) size in the cell
+ **/
+static u8 get_cell_data_size(enum hinic_api_cmd_chain_type type)
+{
+ u8 cell_data_size = 0;
+
+ switch (type) {
+ case HINIC_API_CMD_WRITE_TO_MGMT_CPU:
+ cell_data_size = ALIGN(API_CMD_CELL_DESC_SIZE +
+ API_CMD_CELL_DATA_ADDR_SIZE,
+ API_CMD_CELL_ALIGNMENT);
+ break;
+ default:
+ break;
+ }
+
+ return cell_data_size;
+}
+
+/**
+ * prepare_cell_ctrl - prepare the ctrl of the cell for the command
+ * @cell_ctrl: the control of the cell to set the control value into it
+ * @data_size: the size of the data in the cell
+ **/
+static void prepare_cell_ctrl(u64 *cell_ctrl, u16 data_size)
+{
+ u8 chksum;
+ u64 ctrl;
+
+ ctrl = HINIC_API_CMD_CELL_CTRL_SET(SIZE_8BYTES(data_size), DATA_SZ) |
+ HINIC_API_CMD_CELL_CTRL_SET(RD_DMA_ATTR_DEFAULT, RD_DMA_ATTR) |
+ HINIC_API_CMD_CELL_CTRL_SET(WR_DMA_ATTR_DEFAULT, WR_DMA_ATTR);
+
+ chksum = xor_chksum_set(&ctrl);
+
+ ctrl |= HINIC_API_CMD_CELL_CTRL_SET(chksum, XOR_CHKSUM);
+
+ /* The data in the HW should be in Big Endian Format */
+ *cell_ctrl = cpu_to_be64(ctrl);
+}
+
+/**
+ * prepare_api_cmd - prepare API CMD command
+ * @chain: chain for the command
+ * @dest: destination node on the card that will receive the command
+ * @cmd: command data
+ * @cmd_size: the command size
+ **/
+static void prepare_api_cmd(struct hinic_api_cmd_chain *chain,
+ enum hinic_node_id dest,
+ void *cmd, u16 cmd_size)
+{
+ struct hinic_api_cmd_cell *cell = chain->curr_node;
+ struct hinic_api_cmd_cell_ctxt *cell_ctxt;
+ struct hinic_hwif *hwif = chain->hwif;
+ struct pci_dev *pdev = hwif->pdev;
+
+ cell_ctxt = &chain->cell_ctxt[chain->prod_idx];
+
+ switch (chain->chain_type) {
+ case HINIC_API_CMD_WRITE_TO_MGMT_CPU:
+ cell->desc = HINIC_API_CMD_DESC_SET(SGE_DATA, API_TYPE) |
+ HINIC_API_CMD_DESC_SET(API_CMD_WRITE, RD_WR) |
+ HINIC_API_CMD_DESC_SET(NO_BYPASS, MGMT_BYPASS);
+ break;
+
+ default:
+ dev_err(&pdev->dev, "unknown Chain type\n");
+ return;
+ }
+
+ cell->desc |= HINIC_API_CMD_DESC_SET(dest, DEST) |
+ HINIC_API_CMD_DESC_SET(SIZE_4BYTES(cmd_size), SIZE);
+
+ cell->desc |= HINIC_API_CMD_DESC_SET(xor_chksum_set(&cell->desc),
+ XOR_CHKSUM);
+
+ /* The data in the HW should be in Big Endian Format */
+ cell->desc = cpu_to_be64(cell->desc);
+
+ memcpy(cell_ctxt->api_cmd_vaddr, cmd, cmd_size);
+}
+
+/**
+ * prepare_cell - prepare cell ctrl and cmd in the current cell
+ * @chain: chain for the command
+ * @dest: destination node on the card that will receive the command
+ * @cmd: command data
+ * @cmd_size: the command size
+ *
+ * Return 0 - Success, negative - Failure
+ **/
+static void prepare_cell(struct hinic_api_cmd_chain *chain,
+ enum hinic_node_id dest,
+ void *cmd, u16 cmd_size)
+{
+ struct hinic_api_cmd_cell *curr_node = chain->curr_node;
+ u16 data_size = get_cell_data_size(chain->chain_type);
+
+ prepare_cell_ctrl(&curr_node->ctrl, data_size);
+ prepare_api_cmd(chain, dest, cmd, cmd_size);
+}
+
+static inline void cmd_chain_prod_idx_inc(struct hinic_api_cmd_chain *chain)
+{
+ chain->prod_idx = MASKED_IDX(chain, chain->prod_idx + 1);
+}
+
+/**
+ * api_cmd_status_update - update the status in the chain struct
+ * @chain: chain to update
+ **/
+static void api_cmd_status_update(struct hinic_api_cmd_chain *chain)
+{
+ enum hinic_api_cmd_chain_type chain_type;
+ struct hinic_api_cmd_status *wb_status;
+ struct hinic_hwif *hwif = chain->hwif;
+ struct pci_dev *pdev = hwif->pdev;
+ u64 status_header;
+ u32 status;
+
+ wb_status = chain->wb_status;
+ status_header = be64_to_cpu(wb_status->header);
+
+ status = be32_to_cpu(wb_status->status);
+ if (HINIC_API_CMD_STATUS_GET(status, CHKSUM_ERR)) {
+ dev_err(&pdev->dev, "API CMD status: Xor check error\n");
+ return;
+ }
+
+ chain_type = HINIC_API_CMD_STATUS_HEADER_GET(status_header, CHAIN_ID);
+ if (chain_type >= HINIC_API_CMD_MAX) {
+ dev_err(&pdev->dev, "unknown API CMD Chain %d\n", chain_type);
+ return;
+ }
+
+ chain->cons_idx = HINIC_API_CMD_STATUS_GET(status, CONS_IDX);
+}
+
+/**
+ * wait_for_status_poll - wait for write to api cmd command to complete
+ * @chain: the chain of the command
+ *
+ * Return 0 - Success, negative - Failure
+ **/
+static int wait_for_status_poll(struct hinic_api_cmd_chain *chain)
+{
+ int err = -ETIMEDOUT;
+ unsigned long end;
+
+ end = jiffies + msecs_to_jiffies(API_CMD_TIMEOUT);
+ do {
+ api_cmd_status_update(chain);
+
+ /* wait for CI to be updated - sign for completion */
+ if (chain->cons_idx == chain->prod_idx) {
+ err = 0;
+ break;
+ }
+
+ msleep(20);
+ } while (time_before(jiffies, end));
+
+ return err;
+}
+
+/**
+ * wait_for_api_cmd_completion - wait for command to complete
+ * @chain: chain for the command
+ *
+ * Return 0 - Success, negative - Failure
+ **/
+static int wait_for_api_cmd_completion(struct hinic_api_cmd_chain *chain)
+{
+ struct hinic_hwif *hwif = chain->hwif;
+ struct pci_dev *pdev = hwif->pdev;
+ int err;
+
+ switch (chain->chain_type) {
+ case HINIC_API_CMD_WRITE_TO_MGMT_CPU:
+ err = wait_for_status_poll(chain);
+ if (err) {
+ dev_err(&pdev->dev, "API CMD Poll status timeout\n");
+ break;
+ }
+ break;
+
+ default:
+ dev_err(&pdev->dev, "unknown API CMD Chain type\n");
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
+
/**
* api_cmd - API CMD command
* @chain: chain for the command
@@ -65,8 +366,30 @@ enum api_cmd_xor_chk_level {
static int api_cmd(struct hinic_api_cmd_chain *chain,
enum hinic_node_id dest, u8 *cmd, u16 cmd_size)
{
- /* should be implemented */
- return -EINVAL;
+ struct hinic_api_cmd_cell_ctxt *ctxt;
+ int err;
+
+ down(&chain->sem);
+ if (chain_busy(chain)) {
+ up(&chain->sem);
+ return -EBUSY;
+ }
+
+ prepare_cell(chain, dest, cmd, cmd_size);
+ cmd_chain_prod_idx_inc(chain);
+
+ wmb(); /* inc pi before issue the command */
+
+ set_prod_idx(chain); /* issue the command */
+
+ ctxt = &chain->cell_ctxt[chain->prod_idx];
+
+ chain->curr_node = ctxt->cell_vaddr;
+
+ err = wait_for_api_cmd_completion(chain);
+
+ up(&chain->sem);
+ return err;
}

/**
@@ -491,6 +814,8 @@ static int api_chain_init(struct hinic_api_cmd_chain *chain,
chain->prod_idx = 0;
chain->cons_idx = 0;

+ sema_init(&chain->sem, 1);
+
cell_ctxt_size = chain->num_cells * sizeof(*chain->cell_ctxt);
chain->cell_ctxt = devm_kzalloc(&pdev->dev, cell_ctxt_size, GFP_KERNEL);
if (!chain->cell_ctxt)
diff --git a/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.h b/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.h
index e8865d6..31b94d5 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.h
+++ b/drivers/net/ethernet/huawei/hinic/hinic_hw_api_cmd.h
@@ -17,9 +17,22 @@
#define HINIC_HW_API_CMD_H

#include <linux/types.h>
+#include <linux/semaphore.h>

#include "hinic_hw_if.h"

+#define HINIC_API_CMD_PI_IDX_SHIFT 0
+
+#define HINIC_API_CMD_PI_IDX_MASK 0xFFFFFF
+
+#define HINIC_API_CMD_PI_SET(val, member) \
+ (((u32)(val) & HINIC_API_CMD_PI_##member##_MASK) << \
+ HINIC_API_CMD_PI_##member##_SHIFT)
+
+#define HINIC_API_CMD_PI_CLEAR(val, member) \
+ ((val) & (~(HINIC_API_CMD_PI_##member##_MASK \
+ << HINIC_API_CMD_PI_##member##_SHIFT)))
+
#define HINIC_API_CMD_CHAIN_REQ_RESTART_SHIFT 1

#define HINIC_API_CMD_CHAIN_REQ_RESTART_MASK 0x1
@@ -58,6 +71,56 @@
((val) & (~(HINIC_API_CMD_CHAIN_CTRL_##member##_MASK \
<< HINIC_API_CMD_CHAIN_CTRL_##member##_SHIFT)))

+#define HINIC_API_CMD_CELL_CTRL_DATA_SZ_SHIFT 0
+#define HINIC_API_CMD_CELL_CTRL_RD_DMA_ATTR_SHIFT 16
+#define HINIC_API_CMD_CELL_CTRL_WR_DMA_ATTR_SHIFT 24
+#define HINIC_API_CMD_CELL_CTRL_XOR_CHKSUM_SHIFT 56
+
+#define HINIC_API_CMD_CELL_CTRL_DATA_SZ_MASK 0x3F
+#define HINIC_API_CMD_CELL_CTRL_RD_DMA_ATTR_MASK 0x3F
+#define HINIC_API_CMD_CELL_CTRL_WR_DMA_ATTR_MASK 0x3F
+#define HINIC_API_CMD_CELL_CTRL_XOR_CHKSUM_MASK 0xFF
+
+#define HINIC_API_CMD_CELL_CTRL_SET(val, member) \
+ ((((u64)val) & HINIC_API_CMD_CELL_CTRL_##member##_MASK) << \
+ HINIC_API_CMD_CELL_CTRL_##member##_SHIFT)
+
+#define HINIC_API_CMD_DESC_API_TYPE_SHIFT 0
+#define HINIC_API_CMD_DESC_RD_WR_SHIFT 1
+#define HINIC_API_CMD_DESC_MGMT_BYPASS_SHIFT 2
+#define HINIC_API_CMD_DESC_DEST_SHIFT 32
+#define HINIC_API_CMD_DESC_SIZE_SHIFT 40
+#define HINIC_API_CMD_DESC_XOR_CHKSUM_SHIFT 56
+
+#define HINIC_API_CMD_DESC_API_TYPE_MASK 0x1
+#define HINIC_API_CMD_DESC_RD_WR_MASK 0x1
+#define HINIC_API_CMD_DESC_MGMT_BYPASS_MASK 0x1
+#define HINIC_API_CMD_DESC_DEST_MASK 0x1F
+#define HINIC_API_CMD_DESC_SIZE_MASK 0x7FF
+#define HINIC_API_CMD_DESC_XOR_CHKSUM_MASK 0xFF
+
+#define HINIC_API_CMD_DESC_SET(val, member) \
+ ((((u64)val) & HINIC_API_CMD_DESC_##member##_MASK) << \
+ HINIC_API_CMD_DESC_##member##_SHIFT)
+
+#define HINIC_API_CMD_STATUS_HEADER_CHAIN_ID_SHIFT 16
+
+#define HINIC_API_CMD_STATUS_HEADER_CHAIN_ID_MASK 0xFF
+
+#define HINIC_API_CMD_STATUS_HEADER_GET(val, member) \
+ (((val) >> HINIC_API_CMD_STATUS_HEADER_##member##_SHIFT) & \
+ HINIC_API_CMD_STATUS_HEADER_##member##_MASK)
+
+#define HINIC_API_CMD_STATUS_CONS_IDX_SHIFT 0
+#define HINIC_API_CMD_STATUS_CHKSUM_ERR_SHIFT 28
+
+#define HINIC_API_CMD_STATUS_CONS_IDX_MASK 0xFFFFFF
+#define HINIC_API_CMD_STATUS_CHKSUM_ERR_MASK 0x3
+
+#define HINIC_API_CMD_STATUS_GET(val, member) \
+ (((val) >> HINIC_API_CMD_STATUS_##member##_SHIFT) & \
+ HINIC_API_CMD_STATUS_##member##_MASK)
+
enum hinic_api_cmd_chain_type {
HINIC_API_CMD_WRITE_TO_MGMT_CPU = 2,

@@ -122,6 +185,8 @@ struct hinic_api_cmd_chain {
u32 prod_idx;
u32 cons_idx;

+ struct semaphore sem;
+
struct hinic_api_cmd_cell_ctxt *cell_ctxt;

dma_addr_t wb_status_paddr;
diff --git a/drivers/net/ethernet/huawei/hinic/hinic_hw_csr.h b/drivers/net/ethernet/huawei/hinic/hinic_hw_csr.h
index a9ece6d..ebbf054 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_hw_csr.h
+++ b/drivers/net/ethernet/huawei/hinic/hinic_hw_csr.h
@@ -56,7 +56,13 @@
#define HINIC_CSR_API_CMD_CHAIN_CTRL_ADDR(idx) \
(HINIC_CSR_API_CMD_BASE + 0x14 + (idx) * HINIC_CSR_API_CMD_STRIDE)

+#define HINIC_CSR_API_CMD_CHAIN_PI_ADDR(idx) \
+ (HINIC_CSR_API_CMD_BASE + 0x1C + (idx) * HINIC_CSR_API_CMD_STRIDE)
+
#define HINIC_CSR_API_CMD_CHAIN_REQ_ADDR(idx) \
(HINIC_CSR_API_CMD_BASE + 0x20 + (idx) * HINIC_CSR_API_CMD_STRIDE)

+#define HINIC_CSR_API_CMD_STATUS_ADDR(idx) \
+ (HINIC_CSR_API_CMD_BASE + 0x30 + (idx) * HINIC_CSR_API_CMD_STRIDE)
+
#endif
--
1.9.1

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