vxge: Check if FCS stripping is disabled by the firmware.

- Added a function to check if FCS stripping is disabled by the firmware, if
  it is not disabled fail driver load.

- By default FCS stripping is disabled by the firmware. With this assumption
  driver decrements the indicated packet length by 4 bytes(FCS length).

- This patch ensures that FCS stripping is disabled during driver load time.

Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 33 insertions, 0 deletions

diff --git a/drivers/net/vxge/vxge-config.c b/drivers/net/vxge/vxge-config.c
index 933237ec38d..c07a7379cfa 100644
--- a/drivers/net/vxge/vxge-config.c
+++ b/drivers/net/vxge/vxge-config.c
@@ -2157,6 +2157,28 @@ exit:
 }
 
 /*
+ * vxge_hw_vpath_strip_fcs_check - Check for FCS strip.
+ */
+enum vxge_hw_status
+vxge_hw_vpath_strip_fcs_check(struct __vxge_hw_device *hldev, u64 vpath_mask)
+{
+        struct vxge_hw_vpmgmt_reg       __iomem *vpmgmt_reg;
+        enum vxge_hw_status status = VXGE_HW_OK;
+        int i = 0, j = 0;
+
+        for (i = 0; i < VXGE_HW_MAX_VIRTUAL_PATHS; i++) {
+                if (!((vpath_mask) & vxge_mBIT(i)))
+                        continue;
+                vpmgmt_reg = hldev->vpmgmt_reg[i];
+                for (j = 0; j < VXGE_HW_MAC_MAX_MAC_PORT_ID; j++) {
+                        if (readq(&vpmgmt_reg->rxmac_cfg0_port_vpmgmt_clone[j])
+                        & VXGE_HW_RXMAC_CFG0_PORT_VPMGMT_CLONE_STRIP_FCS)
+                                return VXGE_HW_FAIL;
+                }
+        }
+        return status;
+}
+/*
  * vxge_hw_mgmt_reg_Write - Write Titan register.
  */
 enum vxge_hw_status
diff --git a/drivers/net/vxge/vxge-config.h b/drivers/net/vxge/vxge-config.h
index 3e94f0ce090..e7877df092f 100644
--- a/drivers/net/vxge/vxge-config.h
+++ b/drivers/net/vxge/vxge-config.h
@@ -2201,6 +2201,8 @@ __vxge_hw_vpath_func_id_get(
 enum vxge_hw_status
 __vxge_hw_vpath_reset_check(struct __vxge_hw_virtualpath *vpath);
 
+enum vxge_hw_status
+vxge_hw_vpath_strip_fcs_check(struct __vxge_hw_device *hldev, u64 vpath_mask);
 /**
  * vxge_debug
  * @level: level of debug verbosity.
diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
index 7a851ac30c6..04ac4b6cf83 100644
--- a/drivers/net/vxge/vxge-main.c
+++ b/drivers/net/vxge/vxge-main.c
@@ -4244,6 +4244,15 @@ vxge_probe(struct pci_dev *pdev, const struct pci_device_id *pre)
                         goto _exit3;
         }
 
+        /* if FCS stripping is not disabled in MAC fail driver load */
+        if (vxge_hw_vpath_strip_fcs_check(hldev, vpath_mask) != VXGE_HW_OK) {
+                vxge_debug_init(VXGE_ERR,
+                        "%s: FCS stripping is not disabled in MAC"
+                        " failing driver load", VXGE_DRIVER_NAME);
+                ret = -EINVAL;
+                goto _exit4;
+        }
+
         vxge_hw_device_debug_set(hldev, VXGE_ERR, VXGE_COMPONENT_LL);
 
         /* set private device info */