IB/{hfi1, qib, rvt} Cleanup open coded sge usage

Several locations for manipulating sges use an open coded sequence
that is covered by helper functions.

Use the appropriate helper functions.
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/hfi1/ud.c

@@ -222,31 +222,11 @@ static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
 	ssge.num_sge = swqe->wr.num_sge;
 	sge = &ssge.sge;
 	while (length) {
-		u32 len = sge->length;
+		u32 len = rvt_get_sge_length(sge, length);
 
-		if (len > length)
-			len = length;
-		if (len > sge->sge_length)
-			len = sge->sge_length;
 		WARN_ON_ONCE(len == 0);
 		rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);
-		sge->vaddr += len;
-		sge->length -= len;
-		sge->sge_length -= len;
-		if (sge->sge_length == 0) {
-			if (--ssge.num_sge)
-				*sge = *ssge.sg_list++;
-		} else if (sge->length == 0 && sge->mr->lkey) {
-			if (++sge->n >= RVT_SEGSZ) {
-				if (++sge->m >= sge->mr->mapsz)
-					break;
-				sge->n = 0;
-			}
-			sge->vaddr =
-				sge->mr->map[sge->m]->segs[sge->n].vaddr;
-			sge->length =
-				sge->mr->map[sge->m]->segs[sge->n].length;
-		}
+		rvt_update_sge(&ssge, len, false);
 		length -= len;
 	}
 	rvt_put_ss(&qp->r_sge);

drivers/infiniband/hw/qib/qib_sdma.c

@@ -565,13 +565,8 @@ int qib_sdma_verbs_send(struct qib_pportdata *ppd,
 	sge = &ss->sge;
 	while (dwords) {
 		u32 dw;
-		u32 len;
+		u32 len = rvt_get_sge_length(sge, dwords << 2);
 
-		len = dwords << 2;
-		if (len > sge->length)
-			len = sge->length;
-		if (len > sge->sge_length)
-			len = sge->sge_length;
 		dw = (len + 3) >> 2;
 		addr = dma_map_single(&ppd->dd->pcidev->dev, sge->vaddr,
 				      dw << 2, DMA_TO_DEVICE);
@@ -594,24 +589,7 @@ int qib_sdma_verbs_send(struct qib_pportdata *ppd,
 			descqp = &ppd->sdma_descq[0].qw[0];
 			++ppd->sdma_generation;
 		}
-		sge->vaddr += len;
-		sge->length -= len;
-		sge->sge_length -= len;
-		if (sge->sge_length == 0) {
-			if (--ss->num_sge)
-				*sge = *ss->sg_list++;
-		} else if (sge->length == 0 && sge->mr->lkey) {
-			if (++sge->n >= RVT_SEGSZ) {
-				if (++sge->m >= sge->mr->mapsz)
-					break;
-				sge->n = 0;
-			}
-			sge->vaddr =
-				sge->mr->map[sge->m]->segs[sge->n].vaddr;
-			sge->length =
-				sge->mr->map[sge->m]->segs[sge->n].length;
-		}
-
+		rvt_update_sge(ss, len, false);
 		dwoffset += dw;
 		dwords -= dw;
 	}

drivers/infiniband/sw/rdmavt/qp.c

@@ -2986,34 +2986,12 @@ void rvt_ruc_loopback(struct rvt_qp *sqp)
 
 	sge = &sqp->s_sge.sge;
 	while (sqp->s_len) {
-		u32 len = sqp->s_len;
+		u32 len = rvt_get_sge_length(sge, sqp->s_len);
 
-		if (len > sge->length)
-			len = sge->length;
-		if (len > sge->sge_length)
-			len = sge->sge_length;
 		WARN_ON_ONCE(len == 0);
 		rvt_copy_sge(qp, &qp->r_sge, sge->vaddr,
 			     len, release, copy_last);
-		sge->vaddr += len;
-		sge->length -= len;
-		sge->sge_length -= len;
-		if (sge->sge_length == 0) {
-			if (!release)
-				rvt_put_mr(sge->mr);
-			if (--sqp->s_sge.num_sge)
-				*sge = *sqp->s_sge.sg_list++;
-		} else if (sge->length == 0 && sge->mr->lkey) {
-			if (++sge->n >= RVT_SEGSZ) {
-				if (++sge->m >= sge->mr->mapsz)
-					break;
-				sge->n = 0;
-			}
-			sge->vaddr =
-				sge->mr->map[sge->m]->segs[sge->n].vaddr;
-			sge->length =
-				sge->mr->map[sge->m]->segs[sge->n].length;
-		}
+		rvt_update_sge(&sqp->s_sge, len, !release);
 		sqp->s_len -= len;
 	}
 	if (release)