bnxt_en: Add support for 2nd firmware message channel.

Earlier, some of the firmware commands (ex: CFA_FLOW_*) which are processed
by KONG processor were sent to the CHIMP processor from the host. This
approach was taken as there was no direct message channel to KONG.
CHIMP in turn used to send them to KONG. Newer firmware supports a new
message channel which the host can send messages directly to the KONG
processor.

This patch adds support for required changes needed in the driver
to support direct KONG message channel.  This speeds up flow related
messages sent to the firmware for CLS_FLOWER offload.

Signed-off-by: Venkat Duvvuru <venkatkumar.duvvuru@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 52 insertions, 10 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 46bbe42412d3..79280c8f026b 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -3279,6 +3279,27 @@ static void bnxt_free_hwrm_resources(struct bnxt *bp)
 				  bp->hwrm_cmd_resp_dma_addr);
 		bp->hwrm_cmd_resp_addr = NULL;
 	}
+
+	if (bp->hwrm_cmd_kong_resp_addr) {
+		dma_free_coherent(&pdev->dev, PAGE_SIZE,
+				  bp->hwrm_cmd_kong_resp_addr,
+				  bp->hwrm_cmd_kong_resp_dma_addr);
+		bp->hwrm_cmd_kong_resp_addr = NULL;
+	}
+}
+
+static int bnxt_alloc_kong_hwrm_resources(struct bnxt *bp)
+{
+	struct pci_dev *pdev = bp->pdev;
+
+	bp->hwrm_cmd_kong_resp_addr =
+		dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
+				   &bp->hwrm_cmd_kong_resp_dma_addr,
+				   GFP_KERNEL);
+	if (!bp->hwrm_cmd_kong_resp_addr)
+		return -ENOMEM;
+
+	return 0;
 }
 
 static int bnxt_alloc_hwrm_resources(struct bnxt *bp)
@@ -3740,7 +3761,10 @@ void bnxt_hwrm_cmd_hdr_init(struct bnxt *bp, void *request, u16 req_type,
 	req->req_type = cpu_to_le16(req_type);
 	req->cmpl_ring = cpu_to_le16(cmpl_ring);
 	req->target_id = cpu_to_le16(target_id);
-	req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
+	if (bnxt_kong_hwrm_message(bp, req))
+		req->resp_addr = cpu_to_le64(bp->hwrm_cmd_kong_resp_dma_addr);
+	else
+		req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 }
 
 static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
@@ -3758,11 +3782,7 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
 	u32 doorbell_offset = BNXT_GRCPF_REG_CHIMP_COMM_TRIGGER;
 	u8 *resp_addr = (u8 *)bp->hwrm_cmd_resp_addr;
 	u32 bar_offset = BNXT_GRCPF_REG_CHIMP_COMM;
-
-	req->seq_id = cpu_to_le16(bnxt_get_hwrm_seq_id(bp));
-	memset(resp, 0, PAGE_SIZE);
-	cp_ring_id = le16_to_cpu(req->cmpl_ring);
-	intr_process = (cp_ring_id == INVALID_HW_RING_ID) ? 0 : 1;
+	u16 dst = BNXT_HWRM_CHNL_CHIMP;
 
 	if (msg_len > BNXT_HWRM_MAX_REQ_LEN) {
 		if (msg_len > bp->hwrm_max_ext_req_len ||
@@ -3770,6 +3790,23 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
 			return -EINVAL;
 	}
 
+	if (bnxt_hwrm_kong_chnl(bp, req)) {
+		dst = BNXT_HWRM_CHNL_KONG;
+		bar_offset = BNXT_GRCPF_REG_KONG_COMM;
+		doorbell_offset = BNXT_GRCPF_REG_KONG_COMM_TRIGGER;
+		resp = bp->hwrm_cmd_kong_resp_addr;
+		resp_addr = (u8 *)bp->hwrm_cmd_kong_resp_addr;
+	}
+
+	memset(resp, 0, PAGE_SIZE);
+	cp_ring_id = le16_to_cpu(req->cmpl_ring);
+	intr_process = (cp_ring_id == INVALID_HW_RING_ID) ? 0 : 1;
+
+	req->seq_id = cpu_to_le16(bnxt_get_hwrm_seq_id(bp, dst));
+	/* currently supports only one outstanding message */
+	if (intr_process)
+		bp->hwrm_intr_seq_id = le16_to_cpu(req->seq_id);
+
 	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;
@@ -3808,10 +3845,6 @@ static int bnxt_hwrm_do_send_msg(struct bnxt *bp, void *msg, u32 msg_len,
 	for (i = msg_len; i < max_req_len; i += 4)
 		writel(0, bp->bar0 + bar_offset + i);
 
-	/* currently supports only one outstanding message */
-	if (intr_process)
-		bp->hwrm_intr_seq_id = le16_to_cpu(req->seq_id);
-
 	/* Ring channel doorbell */
 	writel(1, bp->bar0 + doorbell_offset);
 
@@ -6488,6 +6521,9 @@ static int bnxt_hwrm_ver_get(struct bnxt *bp)
 	    (dev_caps_cfg & VER_GET_RESP_DEV_CAPS_CFG_SHORT_CMD_REQUIRED))
 		bp->fw_cap |= BNXT_FW_CAP_SHORT_CMD;
 
+	if (dev_caps_cfg & VER_GET_RESP_DEV_CAPS_CFG_KONG_MB_CHNL_SUPPORTED)
+		bp->fw_cap |= BNXT_FW_CAP_KONG_MB_CHNL;
+
 hwrm_ver_get_exit:
 	mutex_unlock(&bp->hwrm_cmd_lock);
 	return rc;
@@ -10226,6 +10262,12 @@ 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_KONG_MB_CHNL) {
+		rc = bnxt_alloc_kong_hwrm_resources(bp);
+		if (rc)
+			bp->fw_cap &= ~BNXT_FW_CAP_KONG_MB_CHNL;
+	}
+
 	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);