IB/rdmavt: Add support for ib_map_mr_sg
This implements the device specific function needed by the verbs
API function ib_map_mr_sg().
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/sw/rdmavt/mr.c b/drivers/infiniband/sw/rdmavt/mr.c
index 0f4d450..75f158a 100644
--- a/drivers/infiniband/sw/rdmavt/mr.c
+++ b/drivers/infiniband/sw/rdmavt/mr.c
@@ -480,6 +480,57 @@
}
/**
+ * rvt_set_page - page assignment function called by ib_sg_to_pages
+ * @ibmr: memory region
+ * @addr: dma address of mapped page
+ *
+ * Return: 0 on success
+ */
+static int rvt_set_page(struct ib_mr *ibmr, u64 addr)
+{
+ struct rvt_mr *mr = to_imr(ibmr);
+ u32 ps = 1 << mr->mr.page_shift;
+ u32 mapped_segs = mr->mr.length >> mr->mr.page_shift;
+ int m, n;
+
+ if (unlikely(mapped_segs == mr->mr.max_segs))
+ return -ENOMEM;
+
+ if (mr->mr.length == 0) {
+ mr->mr.user_base = addr;
+ mr->mr.iova = addr;
+ }
+
+ m = mapped_segs / RVT_SEGSZ;
+ n = mapped_segs % RVT_SEGSZ;
+ mr->mr.map[m]->segs[n].vaddr = (void *)addr;
+ mr->mr.map[m]->segs[n].length = ps;
+ mr->mr.length += ps;
+
+ return 0;
+}
+
+/**
+ * rvt_map_mr_sg - map sg list and set it the memory region
+ * @ibmr: memory region
+ * @sg: dma mapped scatterlist
+ * @sg_nents: number of entries in sg
+ * @sg_offset: offset in bytes into sg
+ *
+ * Return: number of sg elements mapped to the memory region
+ */
+int rvt_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg,
+ int sg_nents, unsigned int *sg_offset)
+{
+ struct rvt_mr *mr = to_imr(ibmr);
+
+ mr->mr.length = 0;
+ mr->mr.page_shift = PAGE_SHIFT;
+ return ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset,
+ rvt_set_page);
+}
+
+/**
* rvt_alloc_fmr - allocate a fast memory region
* @pd: the protection domain for this memory region
* @mr_access_flags: access flags for this memory region