enic: Bug Fix: Fix hardware descriptor reads

The last bit written to a completion descriptor by hardware is the color
bit. Driver must read all other descriptor fields only after reading the
color bit to avoid reading stale descriptor fields.  There is a rmb() after
reading the color bit to avoid any compiler/cpu reordering of the reads.
The color bit is the generation bit that toggles each pass through the
completion descriptor ring.

Signed-off-by: Scott Feldman <scofeldm@cisco.com>
Signed-off-by: Vasanthy Kolluri <vkolluri@cisco.com>
Signed-off-by: Roopa Prabhu <roprabhu@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 9 insertions, 5 deletions

diff --git a/drivers/net/enic/cq_enet_desc.h b/drivers/net/enic/cq_enet_desc.h
index 03dce9ed612c..337d1943af46 100644
--- a/drivers/net/enic/cq_enet_desc.h
+++ b/drivers/net/enic/cq_enet_desc.h
@@ -101,14 +101,18 @@ static inline void cq_enet_rq_desc_dec(struct cq_enet_rq_desc *desc,
         u8 *tcp_udp_csum_ok, u8 *udp, u8 *tcp, u8 *ipv4_csum_ok,
         u8 *ipv6, u8 *ipv4, u8 *ipv4_fragment, u8 *fcs_ok)
 {
-        u16 completed_index_flags = le16_to_cpu(desc->completed_index_flags);
-        u16 q_number_rss_type_flags =
-                le16_to_cpu(desc->q_number_rss_type_flags);
-        u16 bytes_written_flags = le16_to_cpu(desc->bytes_written_flags);
+        u16 completed_index_flags;
+        u16 q_number_rss_type_flags;
+        u16 bytes_written_flags;
 
         cq_desc_dec((struct cq_desc *)desc, type,
                 color, q_number, completed_index);
 
+        completed_index_flags = le16_to_cpu(desc->completed_index_flags);
+        q_number_rss_type_flags =
+                le16_to_cpu(desc->q_number_rss_type_flags);
+        bytes_written_flags = le16_to_cpu(desc->bytes_written_flags);
+
         *ingress_port = (completed_index_flags &
                 CQ_ENET_RQ_DESC_FLAGS_INGRESS_PORT) ? 1 : 0;
         *fcoe = (completed_index_flags & CQ_ENET_RQ_DESC_FLAGS_FCOE) ?
diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h
index ee01f5a6d0d4..9f5ed3e5e3fe 100644
--- a/drivers/net/enic/enic.h
+++ b/drivers/net/enic/enic.h
@@ -34,7 +34,7 @@
 
 #define DRV_NAME                "enic"
 #define DRV_DESCRIPTION         "Cisco 10G Ethernet Driver"
-#define DRV_VERSION             "1.1.0.241a"
+#define DRV_VERSION             "1.3.1.1"
 #define DRV_COPYRIGHT           "Copyright 2008-2009 Cisco Systems, Inc"
 #define PFX                     DRV_NAME ": "