bnxt_en: Add maximum extended request length fw message support.

Support the max_ext_req_len field from the HWRM_VER_GET_RESPONSE.
If this field is valid and greater than the mailbox size, use the
short command format to send firmware messages greater than the
mailbox size.  Newer devices use this method to send larger messages
to the firmware.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -3042,7 +3042,7 @@ static void bnxt_free_hwrm_short_cmd_req(struct bnxt *bp)
 	if (bp->hwrm_short_cmd_req_addr) {
 		struct pci_dev *pdev = bp->pdev;
 
-		dma_free_coherent(&pdev->dev, BNXT_HWRM_MAX_REQ_LEN,
+		dma_free_coherent(&pdev->dev, bp->hwrm_max_ext_req_len,
 				  bp->hwrm_short_cmd_req_addr,
 				  bp->hwrm_short_cmd_req_dma_addr);
 		bp->hwrm_short_cmd_req_addr = NULL;
@@ -3054,7 +3054,7 @@ static int bnxt_alloc_hwrm_short_cmd_req(struct bnxt *bp)
 	struct pci_dev *pdev = bp->pdev;
 
 	bp->hwrm_short_cmd_req_addr =
-		dma_alloc_coherent(&pdev->dev, BNXT_HWRM_MAX_REQ_LEN,
+		dma_alloc_coherent(&pdev->dev, bp->hwrm_max_ext_req_len,
 				   &bp->hwrm_short_cmd_req_dma_addr,
 				   GFP_KERNEL);
 	if (!bp->hwrm_short_cmd_req_addr)
@@ -3469,12 +3469,27 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
 	cp_ring_id = le16_to_cpu(req->cmpl_ring);
 	intr_process = (cp_ring_id == INVALID_HW_RING_ID) ? 0 : 1;
 
-	if (bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) {
+	if (msg_len > BNXT_HWRM_MAX_REQ_LEN) {
+		if (msg_len > bp->hwrm_max_ext_req_len ||
+		    !bp->hwrm_short_cmd_req_addr)
+			return -EINVAL;
+	}
+
+	if ((bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) ||
+	    msg_len > BNXT_HWRM_MAX_REQ_LEN) {
 		void *short_cmd_req = bp->hwrm_short_cmd_req_addr;
+		u16 max_msg_len;
+
+		/* Set boundary for maximum extended request length for short
+		 * cmd format. If passed up from device use the max supported
+		 * internal req length.
+		 */
+		max_msg_len = bp->hwrm_max_ext_req_len;
 
 		memcpy(short_cmd_req, req, msg_len);
-		memset(short_cmd_req + msg_len, 0, BNXT_HWRM_MAX_REQ_LEN -
-						   msg_len);
+		if (msg_len < max_msg_len)
+			memset(short_cmd_req + msg_len, 0,
+			       max_msg_len - msg_len);
 
 		short_input.req_type = req->req_type;
 		short_input.signature =
@@ -5381,8 +5396,12 @@ static int bnxt_hwrm_ver_get(struct bnxt *bp)
 	if (!bp->hwrm_cmd_timeout)
 		bp->hwrm_cmd_timeout = DFLT_HWRM_CMD_TIMEOUT;
 
-	if (resp->hwrm_intf_maj_8b >= 1)
+	if (resp->hwrm_intf_maj_8b >= 1) {
 		bp->hwrm_max_req_len = le16_to_cpu(resp->max_req_win_len);
+		bp->hwrm_max_ext_req_len = le16_to_cpu(resp->max_ext_req_len);
+	}
+	if (bp->hwrm_max_ext_req_len < HWRM_MAX_REQ_LEN)
+		bp->hwrm_max_ext_req_len = HWRM_MAX_REQ_LEN;
 
 	bp->chip_num = le16_to_cpu(resp->chip_num);
 	if (bp->chip_num == CHIP_NUM_58700 && !resp->chip_rev &&
@@ -8908,7 +8927,8 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (rc)
 		goto init_err_pci_clean;
 
-	if (bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) {
+	if ((bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) ||
+	    bp->hwrm_max_ext_req_len > BNXT_HWRM_MAX_REQ_LEN) {
 		rc = bnxt_alloc_hwrm_short_cmd_req(bp);
 		if (rc)
 			goto init_err_pci_clean;

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1315,6 +1315,7 @@ struct bnxt {
 	u16			fw_tx_stats_ext_size;
 
 	u16			hwrm_max_req_len;
+	u16			hwrm_max_ext_req_len;
 	int			hwrm_cmd_timeout;
 	struct mutex		hwrm_cmd_lock;	/* serialize hwrm messages */
 	struct hwrm_ver_get_output	ver_resp;