RDMA/nes: Fix CRC endianness for RDMA connection establishment on big-endian

With commit ef19454b ("[LIB] crc32c: Keep intermediate crc state in
cpu order"), the behavior of crc32c changes on big-endian platforms.

Our algorithm expects the previous behavior; otherwise we have RDMA
connection establishment failure on big-endian platforms like powerpc.
Apply cpu_to_le32() to value returned by crc32c() to get the previous
behavior.

Signed-off-by: Faisal Latif <flatif@neteffect.com>
Signed-off-by: Glenn Streiff <gstreiff@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 21 insertions, 4 deletions

diff --git a/drivers/infiniband/hw/nes/nes.h b/drivers/infiniband/hw/nes/nes.h
index fd57e8a1582f..a48b288618ec 100644
--- a/drivers/infiniband/hw/nes/nes.h
+++ b/drivers/infiniband/hw/nes/nes.h
@@ -285,6 +285,21 @@ struct nes_device {
 };
 
 
+static inline __le32 get_crc_value(struct nes_v4_quad *nes_quad)
+{
+        u32 crc_value;
+        crc_value = crc32c(~0, (void *)nes_quad, sizeof (struct nes_v4_quad));
+
+        /*
+         * With commit ef19454b ("[LIB] crc32c: Keep intermediate crc
+         * state in cpu order"), behavior of crc32c changes on
+         * big-endian platforms.  Our algorithm expects the previous
+         * behavior; otherwise we have RDMA connection establishment
+         * issue on big-endian.
+         */
+        return cpu_to_le32(crc_value);
+}
+
 static inline void
 set_wqe_64bit_value(__le32 *wqe_words, u32 index, u64 value)
 {
diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index 6c298aa9ab05..39adb267fb15 100644
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/drivers/infiniband/hw/nes/nes_cm.c
@@ -2320,6 +2320,7 @@ int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
         struct iw_cm_event cm_event;
         struct nes_hw_qp_wqe *wqe;
         struct nes_v4_quad nes_quad;
+        u32 crc_value;
         int ret;
 
         ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
@@ -2436,8 +2437,8 @@ int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
         nes_quad.TcpPorts[1]   = cm_id->local_addr.sin_port;
 
         /* Produce hash key */
-        nesqp->hte_index = cpu_to_be32(
-                        crc32c(~0, (void *)&nes_quad, sizeof(nes_quad)) ^ 0xffffffff);
+        crc_value = get_crc_value(&nes_quad);
+        nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, CRC = 0x%08X\n",
                         nesqp->hte_index, nesqp->hte_index & adapter->hte_index_mask);
 
@@ -2751,6 +2752,7 @@ void cm_event_connected(struct nes_cm_event *event)
         struct iw_cm_event cm_event;
         struct nes_hw_qp_wqe *wqe;
         struct nes_v4_quad nes_quad;
+        u32 crc_value;
         int ret;
 
         /* get all our handles */
@@ -2828,8 +2830,8 @@ void cm_event_connected(struct nes_cm_event *event)
         nes_quad.TcpPorts[1] = cm_id->local_addr.sin_port;
 
         /* Produce hash key */
-        nesqp->hte_index = cpu_to_be32(
-                        crc32c(~0, (void *)&nes_quad, sizeof(nes_quad)) ^ 0xffffffff);
+        crc_value = get_crc_value(&nes_quad);
+        nesqp->hte_index = cpu_to_be32(crc_value ^ 0xffffffff);
         nes_debug(NES_DBG_CM, "HTE Index = 0x%08X, After CRC = 0x%08X\n",
                         nesqp->hte_index, nesqp->hte_index & nesadapter->hte_index_mask);