/* Normal operation
*
* A Memory Region is prepared for RDMA READ or WRITE using a FAST_REG
- * Work Request (frwr_op_map). When the RDMA operation is finished, this
+ * Work Request (frwr_map). When the RDMA operation is finished, this
* Memory Region is invalidated using a LOCAL_INV Work Request
- * (frwr_op_unmap_sync).
+ * (frwr_unmap_sync).
*
* Typically these Work Requests are not signaled, and neither are RDMA
* SEND Work Requests (with the exception of signaling occasionally to
* prevent provider work queue overflows). This greatly reduces HCA
* interrupt workload.
*
- * As an optimization, frwr_op_unmap marks MRs INVALID before the
+ * As an optimization, frwr_unmap marks MRs INVALID before the
* LOCAL_INV WR is posted. If posting succeeds, the MR is placed on
* rb_mrs immediately so that no work (like managing a linked list
* under a spinlock) is needed in the completion upcall.
*
- * But this means that frwr_op_map() can occasionally encounter an MR
+ * But this means that frwr_map() can occasionally encounter an MR
* that is INVALID but the LOCAL_INV WR has not completed. Work Queue
* ordering prevents a subsequent FAST_REG WR from executing against
* that MR while it is still being invalidated.
* FLUSHED_LI: The MR was being invalidated when the QP entered ERROR
* state, and the pending WR was flushed.
*
- * When frwr_op_map encounters FLUSHED and VALID MRs, they are recovered
+ * When frwr_map encounters FLUSHED and VALID MRs, they are recovered
* with ib_dereg_mr and then are re-initialized. Because MR recovery
* allocates fresh resources, it is deferred to a workqueue, and the
* recovered MRs are placed back on the rb_mrs list when recovery is
- * complete. frwr_op_map allocates another MR for the current RPC while
+ * complete. frwr_map allocates another MR for the current RPC while
* the broken MR is reset.
*
- * To ensure that frwr_op_map doesn't encounter an MR that is marked
+ * To ensure that frwr_map doesn't encounter an MR that is marked
* INVALID but that is about to be flushed due to a previous transport
* disconnect, the transport connect worker attempts to drain all
* pending send queue WRs before the transport is reconnected.
# define RPCDBG_FACILITY RPCDBG_TRANS
#endif
-bool
-frwr_is_supported(struct rpcrdma_ia *ia)
+/**
+ * frwr_is_supported - Check if device supports FRWR
+ * @ia: interface adapter to check
+ *
+ * Returns true if device supports FRWR, otherwise false
+ */
+bool frwr_is_supported(struct rpcrdma_ia *ia)
{
struct ib_device_attr *attrs = &ia->ri_device->attrs;
return false;
}
-static void
-frwr_op_release_mr(struct rpcrdma_mr *mr)
+/**
+ * frwr_release_mr - Destroy one MR
+ * @mr: MR allocated by frwr_init_mr
+ *
+ */
+void frwr_release_mr(struct rpcrdma_mr *mr)
{
int rc;
list_del(&mr->mr_all);
r_xprt->rx_stats.mrs_recycled++;
spin_unlock(&r_xprt->rx_buf.rb_mrlock);
- frwr_op_release_mr(mr);
+
+ frwr_release_mr(mr);
}
-static int
-frwr_op_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
+/**
+ * frwr_init_mr - Initialize one MR
+ * @ia: interface adapter
+ * @mr: generic MR to prepare for FRWR
+ *
+ * Returns zero if successful. Otherwise a negative errno
+ * is returned.
+ */
+int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
{
unsigned int depth = ia->ri_max_frwr_depth;
struct rpcrdma_frwr *frwr = &mr->frwr;
return rc;
}
-/* On success, sets:
+/**
+ * frwr_open - Prepare an endpoint for use with FRWR
+ * @ia: interface adapter this endpoint will use
+ * @ep: endpoint to prepare
+ * @cdata: transport parameters
+ *
+ * On success, sets:
* ep->rep_attr.cap.max_send_wr
* ep->rep_attr.cap.max_recv_wr
* cdata->max_requests
* And these FRWR-related fields:
* ia->ri_max_frwr_depth
* ia->ri_mrtype
+ *
+ * On failure, a negative errno is returned.
*/
-static int
-frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
- struct rpcrdma_create_data_internal *cdata)
+int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+ struct rpcrdma_create_data_internal *cdata)
{
struct ib_device_attr *attrs = &ia->ri_device->attrs;
int max_qp_wr, depth, delta;
return 0;
}
-/* FRWR mode conveys a list of pages per chunk segment. The
+/**
+ * frwr_maxpages - Compute size of largest payload
+ * @r_xprt: transport
+ *
+ * Returns maximum size of an RPC message, in pages.
+ *
+ * FRWR mode conveys a list of pages per chunk segment. The
* maximum length of that list is the FRWR page list depth.
*/
-static size_t
-frwr_op_maxpages(struct rpcrdma_xprt *r_xprt)
+size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
trace_xprtrdma_wc_li_wake(wc, frwr);
}
-/* Post a REG_MR Work Request to register a memory region
+/**
+ * frwr_map - Register a memory region
+ * @r_xprt: controlling transport
+ * @seg: memory region co-ordinates
+ * @nsegs: number of segments remaining
+ * @writing: true when RDMA Write will be used
+ * @out: initialized MR
+ *
+ * Prepare a REG_MR Work Request to register a memory region
* for remote access via RDMA READ or RDMA WRITE.
+ *
+ * Returns the next segment or a negative errno pointer.
+ * On success, the prepared MR is planted in @out.
*/
-static struct rpcrdma_mr_seg *
-frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
- int nsegs, bool writing, struct rpcrdma_mr **out)
+struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
+ struct rpcrdma_mr_seg *seg,
+ int nsegs, bool writing,
+ struct rpcrdma_mr **out)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
bool holes_ok = ia->ri_mrtype == IB_MR_TYPE_SG_GAPS;
return ERR_PTR(-EIO);
}
-/* Post Send WR containing the RPC Call message.
+/**
+ * frwr_send - post Send WR containing the RPC Call message
+ * @ia: interface adapter
+ * @req: Prepared RPC Call
*
* For FRMR, chain any FastReg WRs to the Send WR. Only a
* single ib_post_send call is needed to register memory
* and then post the Send WR.
+ *
+ * Returns the result of ib_post_send.
*/
-static int
-frwr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
+int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
{
struct ib_send_wr *post_wr;
struct rpcrdma_mr *mr;
return ib_post_send(ia->ri_id->qp, post_wr, NULL);
}
-/* Handle a remotely invalidated mr on the @mrs list
+/**
+ * frwr_reminv - handle a remotely invalidated mr on the @mrs list
+ * @rep: Received reply
+ * @mrs: list of MRs to check
+ *
*/
-static void
-frwr_op_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
+void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
{
struct rpcrdma_mr *mr;
}
}
-/* Invalidate all memory regions that were registered for "req".
+/**
+ * frwr_unmap_sync - invalidate memory regions that were registered for @req
+ * @r_xprt: controlling transport
+ * @mrs: list of MRs to process
*
* Sleeps until it is safe for the host CPU to access the
* previously mapped memory regions.
* Caller ensures that @mrs is not empty before the call. This
* function empties the list.
*/
-static void
-frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mrs)
+void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mrs)
{
struct ib_send_wr *first, **prev, *last;
const struct ib_send_wr *bad_wr;
rpcrdma_mr_recycle(mr);
}
}
-
-const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
- .ro_map = frwr_op_map,
- .ro_send = frwr_op_send,
- .ro_reminv = frwr_op_reminv,
- .ro_unmap_sync = frwr_op_unmap_sync,
- .ro_open = frwr_op_open,
- .ro_maxpages = frwr_op_maxpages,
- .ro_init_mr = frwr_op_init_mr,
- .ro_release_mr = frwr_op_release_mr,
- .ro_displayname = "frwr",
- .ro_send_w_inv_ok = RPCRDMA_CMP_F_SND_W_INV_OK,
-};
projects / linux-2.6-microblaze.git / blobdiff