IB/core: Introduce new fast registration API
The new fast registration verb ib_map_mr_sg receives a scatterlist and converts it to a page list under the verbs API thus hiding the specific HW mapping details away from the consumer. The provider drivers are provided with a generic helper ib_sg_to_pages that converts a scatterlist into a vector of page addresses. The drivers can still perform any HW specific page address setting by passing a set_page function pointer which will be invoked for each page address. This allows drivers to avoid keeping a shadow page vectors and convert them to HW specific translations by doing extra copies. This API will allow ULPs to remove the duplicated code of constructing a page vector from a given sg list. The send work request ib_reg_wr also shrinks as it will contain only mr, key and access flags in addition. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Tested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg
Doug Ledford
parent
63e8790d39
commit
4c67e2bfc8
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@ -1496,3 +1496,110 @@ int ib_check_mr_status(struct ib_mr *mr, u32 check_mask,
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mr->device->check_mr_status(mr, check_mask, mr_status) : -ENOSYS;
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}
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EXPORT_SYMBOL(ib_check_mr_status);
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/**
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* ib_map_mr_sg() - Map the largest prefix of a dma mapped SG list
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* and set it the memory region.
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* @mr: memory region
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* @sg: dma mapped scatterlist
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* @sg_nents: number of entries in sg
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* @page_size: page vector desired page size
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*
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* Constraints:
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* - The first sg element is allowed to have an offset.
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* - Each sg element must be aligned to page_size (or physically
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* contiguous to the previous element). In case an sg element has a
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* non contiguous offset, the mapping prefix will not include it.
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* - The last sg element is allowed to have length less than page_size.
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* - If sg_nents total byte length exceeds the mr max_num_sge * page_size
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* then only max_num_sg entries will be mapped.
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*
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* Returns the number of sg elements that were mapped to the memory region.
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*
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* After this completes successfully, the memory region
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* is ready for registration.
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*/
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int ib_map_mr_sg(struct ib_mr *mr,
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struct scatterlist *sg,
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int sg_nents,
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unsigned int page_size)
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{
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if (unlikely(!mr->device->map_mr_sg))
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return -ENOSYS;
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mr->page_size = page_size;
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return mr->device->map_mr_sg(mr, sg, sg_nents);
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}
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EXPORT_SYMBOL(ib_map_mr_sg);
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/**
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* ib_sg_to_pages() - Convert the largest prefix of a sg list
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* to a page vector
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* @mr: memory region
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* @sgl: dma mapped scatterlist
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* @sg_nents: number of entries in sg
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* @set_page: driver page assignment function pointer
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*
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* Core service helper for drivers to covert the largest
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* prefix of given sg list to a page vector. The sg list
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* prefix converted is the prefix that meet the requirements
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* of ib_map_mr_sg.
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*
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* Returns the number of sg elements that were assigned to
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* a page vector.
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*/
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int ib_sg_to_pages(struct ib_mr *mr,
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struct scatterlist *sgl,
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int sg_nents,
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int (*set_page)(struct ib_mr *, u64))
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{
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struct scatterlist *sg;
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u64 last_end_dma_addr = 0, last_page_addr = 0;
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unsigned int last_page_off = 0;
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u64 page_mask = ~((u64)mr->page_size - 1);
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int i;
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mr->iova = sg_dma_address(&sgl[0]);
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mr->length = 0;
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for_each_sg(sgl, sg, sg_nents, i) {
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u64 dma_addr = sg_dma_address(sg);
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unsigned int dma_len = sg_dma_len(sg);
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u64 end_dma_addr = dma_addr + dma_len;
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u64 page_addr = dma_addr & page_mask;
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if (i && page_addr != dma_addr) {
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if (last_end_dma_addr != dma_addr) {
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/* gap */
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goto done;
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} else if (last_page_off + dma_len <= mr->page_size) {
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/* chunk this fragment with the last */
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mr->length += dma_len;
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last_end_dma_addr += dma_len;
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last_page_off += dma_len;
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continue;
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} else {
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/* map starting from the next page */
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page_addr = last_page_addr + mr->page_size;
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dma_len -= mr->page_size - last_page_off;
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}
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}
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do {
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if (unlikely(set_page(mr, page_addr)))
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goto done;
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page_addr += mr->page_size;
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} while (page_addr < end_dma_addr);
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mr->length += dma_len;
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last_end_dma_addr = end_dma_addr;
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last_page_addr = end_dma_addr & page_mask;
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last_page_off = end_dma_addr & ~page_mask;
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}
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done:
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return i;
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}
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EXPORT_SYMBOL(ib_sg_to_pages);
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@ -738,6 +738,7 @@ enum ib_wc_opcode {
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IB_WC_LSO,
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IB_WC_LOCAL_INV,
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IB_WC_FAST_REG_MR,
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IB_WC_REG_MR,
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IB_WC_MASKED_COMP_SWAP,
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IB_WC_MASKED_FETCH_ADD,
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/*
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@ -1025,6 +1026,7 @@ enum ib_wr_opcode {
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IB_WR_RDMA_READ_WITH_INV,
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IB_WR_LOCAL_INV,
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IB_WR_FAST_REG_MR,
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IB_WR_REG_MR,
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IB_WR_MASKED_ATOMIC_CMP_AND_SWP,
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IB_WR_MASKED_ATOMIC_FETCH_AND_ADD,
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IB_WR_BIND_MW,
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@ -1157,6 +1159,18 @@ static inline struct ib_fast_reg_wr *fast_reg_wr(struct ib_send_wr *wr)
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return container_of(wr, struct ib_fast_reg_wr, wr);
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}
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struct ib_reg_wr {
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struct ib_send_wr wr;
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struct ib_mr *mr;
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u32 key;
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int access;
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};
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static inline struct ib_reg_wr *reg_wr(struct ib_send_wr *wr)
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{
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return container_of(wr, struct ib_reg_wr, wr);
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}
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struct ib_bind_mw_wr {
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struct ib_send_wr wr;
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struct ib_mw *mw;
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@ -1369,6 +1383,9 @@ struct ib_mr {
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struct ib_uobject *uobject;
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u32 lkey;
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u32 rkey;
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u64 iova;
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u32 length;
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unsigned int page_size;
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atomic_t usecnt; /* count number of MWs */
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};
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@ -1753,6 +1770,9 @@ struct ib_device {
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struct ib_mr * (*alloc_mr)(struct ib_pd *pd,
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enum ib_mr_type mr_type,
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u32 max_num_sg);
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int (*map_mr_sg)(struct ib_mr *mr,
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struct scatterlist *sg,
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int sg_nents);
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struct ib_fast_reg_page_list * (*alloc_fast_reg_page_list)(struct ib_device *device,
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int page_list_len);
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void (*free_fast_reg_page_list)(struct ib_fast_reg_page_list *page_list);
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@ -3059,4 +3079,28 @@ struct net_device *ib_get_net_dev_by_params(struct ib_device *dev, u8 port,
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u16 pkey, const union ib_gid *gid,
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const struct sockaddr *addr);
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int ib_map_mr_sg(struct ib_mr *mr,
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struct scatterlist *sg,
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int sg_nents,
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unsigned int page_size);
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static inline int
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ib_map_mr_sg_zbva(struct ib_mr *mr,
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struct scatterlist *sg,
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int sg_nents,
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unsigned int page_size)
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{
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int n;
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n = ib_map_mr_sg(mr, sg, sg_nents, page_size);
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mr->iova = 0;
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return n;
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}
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int ib_sg_to_pages(struct ib_mr *mr,
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struct scatterlist *sgl,
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int sg_nents,
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int (*set_page)(struct ib_mr *, u64));
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#endif /* IB_VERBS_H */
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