RDMA/cxgb3: Fixes for zero STag

Handling the zero STag in receive work request requires some extra
logic in the driver:

 - Only set the QP_PRIV bit for kernel mode QPs.

- Add a zero STag build function for recv wrs. The uP needs a PBL
  allocated and passed down in the recv WR so it can construct a HW
  PBL for the zero STag S/G entries.  Note: we need to place a few
  restrictions on zero STag usage because of this:

  1) all SGEs in a recv WR must either be zero STag or not.  No mixing.

  2) an individual SGE length cannot exceed 128MB for a zero-stag SGE.
     This should be OK since it's not really practical to allocate
     such a large chunk of pinned contiguous DMA mapped memory.

- Add an optimized non-zero-STag recv wr format for kernel users.
  This is needed to optimize both zero and non-zero STag cracking in
  the recv path for kernel users.

 - Remove the iwch_ prefix from the static build functions.

 - Bump required FW version.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/cxgb3/cxio_wr.h b/drivers/infiniband/hw/cxgb3/cxio_wr.h
index de760e9f1cc6..04618f7bfbb3 100644
--- a/drivers/infiniband/hw/cxgb3/cxio_wr.h
+++ b/drivers/infiniband/hw/cxgb3/cxio_wr.h
@@ -39,6 +39,9 @@
 
 #define T3_MAX_SGE      4
 #define T3_MAX_INLINE	64
+#define T3_STAG0_PBL_SIZE (2 * T3_MAX_SGE << 3)
+#define T3_STAG0_MAX_PBE_LEN (128 * 1024 * 1024)
+#define T3_STAG0_PAGE_SHIFT 15
 
 #define Q_EMPTY(rptr,wptr) ((rptr)==(wptr))
 #define Q_FULL(rptr,wptr,size_log2)  ( (((wptr)-(rptr))>>(size_log2)) && \
@@ -665,6 +668,11 @@ struct t3_swsq {
 	int			signaled;
 };
 
+struct t3_swrq {
+	__u64			wr_id;
+	__u32			pbl_addr;
+};
+
 /*
  * A T3 WQ implements both the SQ and RQ.
  */
@@ -681,14 +689,15 @@ struct t3_wq {
 	u32 sq_wptr;			/* sq_wptr - sq_rptr == count of */
 	u32 sq_rptr;			/* pending wrs */
 	u32 sq_size_log2;		/* sq size */
-	u64 *rq;			/* SW RQ (holds consumer wr_ids */
+	struct t3_swrq *rq;		/* SW RQ (holds consumer wr_ids */
 	u32 rq_wptr;			/* rq_wptr - rq_rptr == count of */
 	u32 rq_rptr;			/* pending wrs */
-	u64 *rq_oldest_wr;		/* oldest wr on the SW RQ */
+	struct t3_swrq *rq_oldest_wr;	/* oldest wr on the SW RQ */
 	u32 rq_size_log2;		/* rq size */
 	u32 rq_addr;			/* rq adapter address */
 	void __iomem *doorbell;		/* kernel db */
 	u64 udb;			/* user db if any */
+	struct cxio_rdev *rdev;
 };
 
 struct t3_cq {