描述：映射mr的sg
调用链：
此处多处调用
static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
struct nvme_rdma_request *req, struct nvme_command *c,
int count)
{
req->mr = ib_mr_pool_get(queue->qp, &queue->qp->rdma_mrs);
/*
* Align the MR to a 4K page size to match the ctrl page size and
* the block virtual boundary.
*/
nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, SZ_4K);
}
映射dma映射的SG列表的最大前缀，并将其设置为内存区域
int ib_map_mr_sg(struct ib_mr *mr, struct scatterlist *sg, int sg_nents,
unsigned int *sg_offset, unsigned int page_size)
{
if (unlikely(!mr->device->ops.map_mr_sg))
return –EOPNOTSUPP;
mr->page_size = page_size;
return mr->device->ops.map_mr_sg(mr, sg, sg_nents, sg_offset);
}
Ops_rxe:
static int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg,
int sg_nents, unsigned int *sg_offset)
{
struct rxe_mem *mr = to_rmr(ibmr);
int 服务器托管网n;
mr->nbuf = 0;
n = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, rxe_set_page);
mr->va = ibmr->iova;
mr->iova = ibmr->iova;
mr->length = ibmr->length;
mr->page_shift = ilog2(ibmr->page_size);
mr->page_mask = ibmr->page_size – 1;
mr->offset = mr->iova & mr->page_mask;
return n;
}
调用ib_sg_to_pages()方法，主要在驱动程序页分配函数指针rxe_set_page
static int rxe_set_page(struct ib_mr *ibmr, u64 addr)
{
struct rxe_mem *mr = to_rmr(ibmr);
struct rxe_map *map;
struct rxe_phys_buf *buf;
if (unlikely(mr->nbuf == mr->num_buf))
return –ENOMEM;
map = mr->map[mr->nbuf / RXE_BUF_PER_MAP];
buf = &map->buf[mr->nbuf % RXE_BUF_PER_MAP];
buf->addr = addr;
buf->size = ibmr->page_size;
mr->nbuf++;
return 0;
}
Ops_i40iw:
static int i40iw_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg,
int sg_nents, unsigned int *sg_offset)
{
struct i40iw_mr *iwmr = to_iwmr(ibmr);
iwmr->npages = 0;
return ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, i40iw_set_page);
}
调用ib_sg_to_pages()方法，主要在驱动程序页分配函数指针i40iw_set_page
sta服务器托管网tic int i40iw_set_page(struct ib_mr *ibmr, u64 addr)
{
struct i40iw_mr *iwmr = to_iwmr(ibmr);
struct i40iw_pbl *iwpbl = &iwmr->iwpbl;
struct i40iw_pble_alloc *palloc = &iwpbl->pble_alloc;
u64 *pbl;
if (unlikely(iwmr->npages == iwmr->page_cnt))
return –ENOMEM;
pbl = (u64 *)palloc->level1.addr;
pbl[iwmr->npages++] = cpu_to_le64(addr);
return 0;
}
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