vxge: Fix a receive stall due to driver being out of synch with chip.

- Fix a receive stall due to driver being out of synch with chip. In a corner
case scenario the adapter's ring controller may return a RxD with transfer code
of 0xC, while the host ownership bit is still set to the adapter. The driver
needs to assume that this case where (host_ownership == 1 or adapter) and
(transfer_code == 0xC) is valid, that is, this RxD has been returned by the
receive ring controller but no frame data is associated with the rxd.

- Restore the transfer code field of each newly replenished RxD to 0x0.

- Code cleanup. Removed usage of magic numbers.

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

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/net/vxge/vxge-traffic.h b/drivers/net/vxge/vxge-traffic.h
index 861c853e3e84..3c35e446e247 100644
--- a/drivers/net/vxge/vxge-traffic.h
+++ b/drivers/net/vxge/vxge-traffic.h
@@ -1866,6 +1866,51 @@ struct vxge_hw_ring_rxd_info {
         u32     rth_hash_type;
         u32     rth_value;
 };
+/**
+ * enum vxge_hw_ring_tcode - Transfer codes returned by adapter
+ * @VXGE_HW_RING_T_CODE_OK: Transfer ok.
+ * @VXGE_HW_RING_T_CODE_L3_CKSUM_MISMATCH: Layer 3 checksum presentation
+ *              configuration mismatch.
+ * @VXGE_HW_RING_T_CODE_L4_CKSUM_MISMATCH: Layer 4 checksum presentation
+ *              configuration mismatch.
+ * @VXGE_HW_RING_T_CODE_L3_L4_CKSUM_MISMATCH: Layer 3 and Layer 4 checksum
+ *              presentation configuration mismatch.
+ * @VXGE_HW_RING_T_CODE_L3_PKT_ERR: Layer 3 error unparseable packet,
+ *              such as unknown IPv6 header.
+ * @VXGE_HW_RING_T_CODE_L2_FRM_ERR: Layer 2 error frame integrity
+ *              error, such as FCS or ECC).
+ * @VXGE_HW_RING_T_CODE_BUF_SIZE_ERR: Buffer size error the RxD buffer(
+ *              s) were not appropriately sized and data loss occurred.
+ * @VXGE_HW_RING_T_CODE_INT_ECC_ERR: Internal ECC error RxD corrupted.
+ * @VXGE_HW_RING_T_CODE_BENIGN_OVFLOW: Benign overflow the contents of
+ *              Segment1 exceeded the capacity of Buffer1 and the remainder
+ *              was placed in Buffer2. Segment2 now starts in Buffer3.
+ *              No data loss or errors occurred.
+ * @VXGE_HW_RING_T_CODE_ZERO_LEN_BUFF: Buffer size 0 one of the RxDs
+ *              assigned buffers has a size of 0 bytes.
+ * @VXGE_HW_RING_T_CODE_FRM_DROP: Frame dropped either due to
+ *              VPath Reset or because of a VPIN mismatch.
+ * @VXGE_HW_RING_T_CODE_UNUSED: Unused
+ * @VXGE_HW_RING_T_CODE_MULTI_ERR: Multiple errors more than one
+ *              transfer code condition occurred.
+ *
+ * Transfer codes returned by adapter.
+ */
+enum vxge_hw_ring_tcode {
+        VXGE_HW_RING_T_CODE_OK                          = 0x0,
+        VXGE_HW_RING_T_CODE_L3_CKSUM_MISMATCH           = 0x1,
+        VXGE_HW_RING_T_CODE_L4_CKSUM_MISMATCH           = 0x2,
+        VXGE_HW_RING_T_CODE_L3_L4_CKSUM_MISMATCH        = 0x3,
+        VXGE_HW_RING_T_CODE_L3_PKT_ERR                  = 0x5,
+        VXGE_HW_RING_T_CODE_L2_FRM_ERR                  = 0x6,
+        VXGE_HW_RING_T_CODE_BUF_SIZE_ERR                = 0x7,
+        VXGE_HW_RING_T_CODE_INT_ECC_ERR                 = 0x8,
+        VXGE_HW_RING_T_CODE_BENIGN_OVFLOW               = 0x9,
+        VXGE_HW_RING_T_CODE_ZERO_LEN_BUFF               = 0xA,
+        VXGE_HW_RING_T_CODE_FRM_DROP                    = 0xC,
+        VXGE_HW_RING_T_CODE_UNUSED                      = 0xE,
+        VXGE_HW_RING_T_CODE_MULTI_ERR                   = 0xF
+};
 
 /**
  * enum enum vxge_hw_ring_hash_type - RTH hash types