staging/rdma/hfi1: Fix regression in send performance

The clear_ahg call is new in hfi1 vs qib.  For small messages the progress
routine always builds one and clears out the ahg state when the queue has gone
to empty which is the predominant case for small messages.

Inline the routine and avoid the call to sdma_ahg_free to mitigate the
performance impact.  Finally, move the routine to qp.h for scope reasons.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rdma/hfi1/qp.h b/drivers/staging/rdma/hfi1/qp.h
index 6b50585..b9c1575 100644 (file)
--- a/drivers/staging/rdma/hfi1/qp.h
+++ b/drivers/staging/rdma/hfi1/qp.h
@@ -52,6 +52,7 @@
 
 #include <linux/hash.h>
 #include "verbs.h"
+#include "sdma.h"
 
 #define QPN_MAX                 (1 << 24)
 #define QPNMAP_ENTRIES          (QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)
@@ -117,6 +118,20 @@ static inline struct hfi1_qp *hfi1_lookup_qpn(struct hfi1_ibport *ibp,
 }
 
 /**
+ * clear_ahg - reset ahg status in qp
+ * @qp - qp pointer
+ */
+static inline void clear_ahg(struct hfi1_qp *qp)
+{
+       qp->s_hdr->ahgcount = 0;
+       qp->s_flags &= ~(HFI1_S_AHG_VALID | HFI1_S_AHG_CLEAR);
+       if (qp->s_sde && qp->s_ahgidx >= 0)
+               sdma_ahg_free(qp->s_sde, qp->s_ahgidx);
+       qp->s_ahgidx = -1;
+       qp->s_sde = NULL;
+}
+
+/**
  * hfi1_error_qp - put a QP into the error state
  * @qp: the QP to put into the error state
  * @err: the receive completion error to signal if a RWQE is active

diff --git a/drivers/staging/rdma/hfi1/ruc.c b/drivers/staging/rdma/hfi1/ruc.c
index a411528..faad1b9 100644 (file)
--- a/drivers/staging/rdma/hfi1/ruc.c
+++ b/drivers/staging/rdma/hfi1/ruc.c
@@ -695,19 +695,6 @@ u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,
        return sizeof(struct ib_grh) / sizeof(u32);
 }
 
-/*
- * free_ahg - clear ahg from QP
- */
-void clear_ahg(struct hfi1_qp *qp)
-{
-       qp->s_hdr->ahgcount = 0;
-       qp->s_flags &= ~(HFI1_S_AHG_VALID | HFI1_S_AHG_CLEAR);
-       if (qp->s_sde)
-               sdma_ahg_free(qp->s_sde, qp->s_ahgidx);
-       qp->s_ahgidx = -1;
-       qp->s_sde = NULL;
-}
-
 #define BTH2_OFFSET (offsetof(struct hfi1_pio_header, hdr.u.oth.bth[2]) / 4)
 
 /**

diff --git a/drivers/staging/rdma/hfi1/verbs.h b/drivers/staging/rdma/hfi1/verbs.h
index ed903a9..afaa0fe 100644 (file)
--- a/drivers/staging/rdma/hfi1/verbs.h
+++ b/drivers/staging/rdma/hfi1/verbs.h
@@ -1078,8 +1078,6 @@ int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_ib_header *hdr,
 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,
                  struct ib_global_route *grh, u32 hwords, u32 nwords);
 
-void clear_ahg(struct hfi1_qp *qp);
-
 void hfi1_make_ruc_header(struct hfi1_qp *qp, struct hfi1_other_headers *ohdr,
                          u32 bth0, u32 bth2, int middle);