linux-kernel - [PATCH 2.6 6/8] RDMA/nes: Fix rdma connection establishment on big-endian platforms

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Date:	Thu, 21 Feb 2008 08:29:41 -0600
From:	gstreiff@...effect.com
To:	rdreier@...co.com
Cc:	flatif@...effect.com, general@...ts.openfabrics.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2.6 6/8] RDMA/nes: Fix rdma connection establishment on big-endian platforms

From: Faisal Latif <flatif@...effect.com>

With commit ef19454bd437b2ba, behavior of crc32c changes on
big-endian platforms.

Our algorithm expects previous behavior otherwise we have
rdma connection establishment failure on big-endian platforms
like ppc64.  Applying cpu_to_le32() to value returned by
crc32c() to get previous behavior.

Signed-off-by: Faisal Latif <flatif@...effect.com>
Signed-off-by: Glenn Streiff <gstreiff@...effect.com>

---
 drivers/infiniband/hw/nes/nes.h    |   14 ++++++++++++++
 drivers/infiniband/hw/nes/nes_cm.c |    5 +++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/nes/nes.h b/drivers/infiniband/hw/nes/nes.h
index fd57e8a..b0d3c52 100644
--- a/drivers/infiniband/hw/nes/nes.h
+++ b/drivers/infiniband/hw/nes/nes.h
@@ -285,6 +285,20 @@ struct nes_device {
 };
 
 
+static inline u32 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 ef19454bd437b2ba, behavior of crc32c changes on
+	* big-endian platforms.  Our algorithm expects previous behavior
+	* otherwise we have rdma connection establishment issue on ppc64.
+	*/
+	crc_value = cpu_to_le32(crc_value);
+	return 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 6c298aa..1f042d1 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);
 
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