From 30da7cff87f0ffa169fe07b766c3d6a5f6d1f6ab Mon Sep 17 00:00:00 2001 From: Faisal Latif Date: Thu, 21 Feb 2008 08:31:22 -0600 Subject: [PATCH] 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 Signed-off-by: Glenn Streiff Signed-off-by: Roland Dreier --- drivers/infiniband/hw/nes/nes.h | 15 +++++++++++++++ drivers/infiniband/hw/nes/nes_cm.c | 10 ++++++---- 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/hw/nes/nes.h b/drivers/infiniband/hw/nes/nes.h index fd57e8a1582..a48b288618e 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 6c298aa9ab0..39adb267fb1 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); -- 2.41.1