cnic: Add a signature to indicate valid doorbell offset.

The buffer that is used to pass doorbell offset to the userspace UIO
driver may contain nonzero value in older versions of bnx2x driver.
Userspace cannot easily tell whether it contains a valid doorbell
offset or not.  With the added signature, userspace will only use
the doorbell offset if the signature is present.

Update version to 2.5.19.

Signed-off-by: Eddie Wai <eddie.wai@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 5 insertions, 2 deletions

diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index f58a8b80302d..fcf9105a5476 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -5220,6 +5220,7 @@ static void cnic_init_rings(struct cnic_dev *dev)
                 cnic_ring_ctl(dev, cid, cli, 1);
                 *cid_ptr = cid >> 4;
                 *(cid_ptr + 1) = cid * bp->db_size;
+                *(cid_ptr + 2) = UIO_USE_TX_DOORBELL;
         }
 }
 
diff --git a/drivers/net/ethernet/broadcom/cnic.h b/drivers/net/ethernet/broadcom/cnic.h
index 0121a5d55192..0d6b13f854d9 100644
--- a/drivers/net/ethernet/broadcom/cnic.h
+++ b/drivers/net/ethernet/broadcom/cnic.h
@@ -186,6 +186,8 @@ struct kcq_info {
         u16             (*hw_idx)(u16);
 };
 
+#define UIO_USE_TX_DOORBELL 0x017855DB
+
 struct cnic_uio_dev {
         struct uio_info         cnic_uinfo;
         u32                     uio_dev;
diff --git a/drivers/net/ethernet/broadcom/cnic_if.h b/drivers/net/ethernet/broadcom/cnic_if.h
index ebbfe25acaa6..8cf6b1926069 100644
--- a/drivers/net/ethernet/broadcom/cnic_if.h
+++ b/drivers/net/ethernet/broadcom/cnic_if.h
@@ -14,8 +14,8 @@
 
 #include "bnx2x/bnx2x_mfw_req.h"
 
-#define CNIC_MODULE_VERSION     "2.5.18"
-#define CNIC_MODULE_RELDATE     "Sept 01, 2013"
+#define CNIC_MODULE_VERSION     "2.5.19"
+#define CNIC_MODULE_RELDATE     "December 19, 2013"
 
 #define CNIC_ULP_RDMA           0
 #define CNIC_ULP_ISCSI          1