From f3eb62d2cc7da7bea4b394dd06f6bc738aa284e7 Mon Sep 17 00:00:00 2001 From: Sathya Perla Date: Tue, 29 Jun 2010 00:11:17 +0000 Subject: [PATCH] be2net: memory barrier fixes on IBM p7 platform The ibm p7 architecure seems to reorder memory accesses more aggressively than previous ppc64 architectures. This requires memory barriers to ensure that rx/tx doorbells are pressed only after memory to be DMAed is written. Signed-off-by: Sathya Perla Signed-off-by: David S. Miller --- drivers/net/benet/be_cmds.c | 2 ++ drivers/net/benet/be_main.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c index ee1ad9693c8f..65e3260d0f08 100644 --- a/drivers/net/benet/be_cmds.c +++ b/drivers/net/benet/be_cmds.c @@ -25,6 +25,8 @@ static void be_mcc_notify(struct be_adapter *adapter) val |= mccq->id & DB_MCCQ_RING_ID_MASK; val |= 1 << DB_MCCQ_NUM_POSTED_SHIFT; + + wmb(); iowrite32(val, adapter->db + DB_MCCQ_OFFSET); } diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c index 01eb447f98b6..b63687956f2b 100644 --- a/drivers/net/benet/be_main.c +++ b/drivers/net/benet/be_main.c @@ -89,6 +89,8 @@ static void be_rxq_notify(struct be_adapter *adapter, u16 qid, u16 posted) u32 val = 0; val |= qid & DB_RQ_RING_ID_MASK; val |= posted << DB_RQ_NUM_POSTED_SHIFT; + + wmb(); iowrite32(val, adapter->db + DB_RQ_OFFSET); } @@ -97,6 +99,8 @@ static void be_txq_notify(struct be_adapter *adapter, u16 qid, u16 posted) u32 val = 0; val |= qid & DB_TXULP_RING_ID_MASK; val |= (posted & DB_TXULP_NUM_POSTED_MASK) << DB_TXULP_NUM_POSTED_SHIFT; + + wmb(); iowrite32(val, adapter->db + DB_TXULP1_OFFSET); } @@ -973,6 +977,7 @@ static struct be_eth_rx_compl *be_rx_compl_get(struct be_adapter *adapter) if (rxcp->dw[offsetof(struct amap_eth_rx_compl, valid) / 32] == 0) return NULL; + rmb(); be_dws_le_to_cpu(rxcp, sizeof(*rxcp)); queue_tail_inc(&adapter->rx_obj.cq); @@ -1066,6 +1071,7 @@ static struct be_eth_tx_compl *be_tx_compl_get(struct be_queue_info *tx_cq) if (txcp->dw[offsetof(struct amap_eth_tx_compl, valid) / 32] == 0) return NULL; + rmb(); be_dws_le_to_cpu(txcp, sizeof(*txcp)); txcp->dw[offsetof(struct amap_eth_tx_compl, valid) / 32] = 0; @@ -1113,6 +1119,7 @@ static inline struct be_eq_entry *event_get(struct be_eq_obj *eq_obj) if (!eqe->evt) return NULL; + rmb(); eqe->evt = le32_to_cpu(eqe->evt); queue_tail_inc(&eq_obj->q); return eqe; -- 2.30.2