4 files changed, 39 insertions, 15 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 01f5aa9cb56d..3d1c1c535038 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -52,7 +52,7 @@
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Christoph Raisch <raisch@de.ibm.com>");
 MODULE_DESCRIPTION("IBM eServer HCA InfiniBand Device Driver");
-MODULE_VERSION("SVNEHCA_0018");
+MODULE_VERSION("SVNEHCA_0019");
 
 int ehca_open_aqp1     = 0;
 int ehca_debug_level   = 0;
@@ -790,7 +790,7 @@ int __init ehca_module_init(void)
 	int ret;
 
 	printk(KERN_INFO "eHCA Infiniband Device Driver "
-	                 "(Rel.: SVNEHCA_0018)\n");
+	                 "(Rel.: SVNEHCA_0019)\n");
 	idr_init(&ehca_qp_idr);
 	idr_init(&ehca_cq_idr);
 	spin_lock_init(&ehca_qp_idr_lock);
diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c
index cf3e50ee2d06..8682aa50c707 100644
--- a/drivers/infiniband/hw/ehca/ehca_qp.c
+++ b/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -732,8 +732,7 @@ static int prepare_sqe_rts(struct ehca_qp *my_qp, struct ehca_shca *shca,
 	u64 h_ret;
 	struct ipz_queue *squeue;
 	void *bad_send_wqe_p, *bad_send_wqe_v;
-	void *squeue_start_p, *squeue_end_p;
-	void *squeue_start_v, *squeue_end_v;
+	u64 q_ofs;
 	struct ehca_wqe *wqe;
 	int qp_num = my_qp->ib_qp.qp_num;
 
@@ -755,26 +754,23 @@ static int prepare_sqe_rts(struct ehca_qp *my_qp, struct ehca_shca *shca,
 	if (ehca_debug_level)
 		ehca_dmp(bad_send_wqe_v, 32, "qp_num=%x bad_wqe", qp_num);
 	squeue = &my_qp->ipz_squeue;
-	squeue_start_p = (void*)virt_to_abs(ipz_qeit_calc(squeue, 0L));
-	squeue_end_p = squeue_start_p+squeue->queue_length;
-	squeue_start_v = abs_to_virt((u64)squeue_start_p);
-	squeue_end_v = abs_to_virt((u64)squeue_end_p);
-	ehca_dbg(&shca->ib_device, "qp_num=%x squeue_start_v=%p squeue_end_v=%p",
-		 qp_num, squeue_start_v, squeue_end_v);
+	if (ipz_queue_abs_to_offset(squeue, (u64)bad_send_wqe_p, &q_ofs)) {
+		ehca_err(&shca->ib_device, "failed to get wqe offset qp_num=%x"
+			 " bad_send_wqe_p=%p", qp_num, bad_send_wqe_p);
+		return -EFAULT;
+	}
 
 	/* loop sets wqe's purge bit */
-	wqe = (struct ehca_wqe*)bad_send_wqe_v;
+	wqe = (struct ehca_wqe*)ipz_qeit_calc(squeue, q_ofs);
 	*bad_wqe_cnt = 0;
 	while (wqe->optype != 0xff && wqe->wqef != 0xff) {
 		if (ehca_debug_level)
 			ehca_dmp(wqe, 32, "qp_num=%x wqe", qp_num);
 		wqe->nr_of_data_seg = 0; /* suppress data access */
 		wqe->wqef = WQEF_PURGE; /* WQE to be purged */
-		wqe = (struct ehca_wqe*)((u8*)wqe+squeue->qe_size);
+		q_ofs = ipz_queue_advance_offset(squeue, q_ofs);
+		wqe = (struct ehca_wqe*)ipz_qeit_calc(squeue, q_ofs);
 		*bad_wqe_cnt = (*bad_wqe_cnt)+1;
-		if ((void*)wqe >= squeue_end_v) {
-			wqe = squeue_start_v;
-		}
 	}
 	/*
 	 * bad wqe will be reprocessed and ignored when pol_cq() is called,
diff --git a/drivers/infiniband/hw/ehca/ipz_pt_fn.c b/drivers/infiniband/hw/ehca/ipz_pt_fn.c
index e028ff1588cc..bf7a40088f61 100644
--- a/drivers/infiniband/hw/ehca/ipz_pt_fn.c
+++ b/drivers/infiniband/hw/ehca/ipz_pt_fn.c
@@ -70,6 +70,19 @@ void *ipz_qeit_eq_get_inc(struct ipz_queue *queue)
 	return ret;
 }
 
+int ipz_queue_abs_to_offset(struct ipz_queue *queue, u64 addr, u64 *q_offset)
+{
+	int i;
+	for (i = 0; i < queue->queue_length / queue->pagesize; i++) {
+		u64 page = (u64)virt_to_abs(queue->queue_pages[i]);
+		if (addr >= page && addr < page + queue->pagesize) {
+			*q_offset = addr - page + i * queue->pagesize;
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
 int ipz_queue_ctor(struct ipz_queue *queue,
 		   const u32 nr_of_pages,
 		   const u32 pagesize, const u32 qe_size, const u32 nr_of_sg)
diff --git a/drivers/infiniband/hw/ehca/ipz_pt_fn.h b/drivers/infiniband/hw/ehca/ipz_pt_fn.h
index 2f13509d5257..dc3bda2634b7 100644
--- a/drivers/infiniband/hw/ehca/ipz_pt_fn.h
+++ b/drivers/infiniband/hw/ehca/ipz_pt_fn.h
@@ -150,6 +150,21 @@ static inline void *ipz_qeit_reset(struct ipz_queue *queue)
 	return ipz_qeit_get(queue);
 }
 
+/*
+ * return the q_offset corresponding to an absolute address
+ */
+int ipz_queue_abs_to_offset(struct ipz_queue *queue, u64 addr, u64 *q_offset);
+
+/*
+ * return the next queue offset. don't modify the queue.
+ */
+static inline u64 ipz_queue_advance_offset(struct ipz_queue *queue, u64 offset)
+{
+	offset += queue->qe_size;
+	if (offset >= queue->queue_length) offset = 0;
+	return offset;
+}
+
 /* struct generic page table */
 struct ipz_pt {
 	u64 entries[EHCA_PT_ENTRIES];