xprtrdma: mind the device's max fast register page list depth
Some rdma devices don't support a fast register page list depth of at least RPCRDMA_MAX_DATA_SEGS. So xprtrdma needs to chunk its fast register regions according to the minimum of the device max supported depth or RPCRDMA_MAX_DATA_SEGS. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Reviewed-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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@ -248,10 +248,6 @@ rpcrdma_create_chunks(struct rpc_rqst *rqst, struct xdr_buf *target,
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/* success. all failures return above */
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req->rl_nchunks = nchunks;
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BUG_ON(nchunks == 0);
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BUG_ON((r_xprt->rx_ia.ri_memreg_strategy == RPCRDMA_FRMR)
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&& (nchunks > 3));
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/*
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* finish off header. If write, marshal discrim and nchunks.
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*/
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@ -539,6 +539,11 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
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__func__);
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memreg = RPCRDMA_REGISTER;
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#endif
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} else {
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/* Mind the ia limit on FRMR page list depth */
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ia->ri_max_frmr_depth = min_t(unsigned int,
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RPCRDMA_MAX_DATA_SEGS,
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devattr.max_fast_reg_page_list_len);
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}
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break;
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}
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@ -659,24 +664,42 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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ep->rep_attr.srq = NULL;
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ep->rep_attr.cap.max_send_wr = cdata->max_requests;
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switch (ia->ri_memreg_strategy) {
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case RPCRDMA_FRMR:
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case RPCRDMA_FRMR: {
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int depth = 7;
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/* Add room for frmr register and invalidate WRs.
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* 1. FRMR reg WR for head
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* 2. FRMR invalidate WR for head
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* 3. FRMR reg WR for pagelist
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* 4. FRMR invalidate WR for pagelist
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* 3. N FRMR reg WRs for pagelist
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* 4. N FRMR invalidate WRs for pagelist
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* 5. FRMR reg WR for tail
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* 6. FRMR invalidate WR for tail
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* 7. The RDMA_SEND WR
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*/
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ep->rep_attr.cap.max_send_wr *= 7;
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/* Calculate N if the device max FRMR depth is smaller than
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* RPCRDMA_MAX_DATA_SEGS.
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*/
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if (ia->ri_max_frmr_depth < RPCRDMA_MAX_DATA_SEGS) {
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int delta = RPCRDMA_MAX_DATA_SEGS -
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ia->ri_max_frmr_depth;
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do {
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depth += 2; /* FRMR reg + invalidate */
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delta -= ia->ri_max_frmr_depth;
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} while (delta > 0);
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}
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ep->rep_attr.cap.max_send_wr *= depth;
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if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr) {
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cdata->max_requests = devattr.max_qp_wr / 7;
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cdata->max_requests = devattr.max_qp_wr / depth;
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if (!cdata->max_requests)
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return -EINVAL;
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ep->rep_attr.cap.max_send_wr = cdata->max_requests * 7;
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ep->rep_attr.cap.max_send_wr = cdata->max_requests *
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depth;
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}
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break;
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}
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case RPCRDMA_MEMWINDOWS_ASYNC:
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case RPCRDMA_MEMWINDOWS:
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/* Add room for mw_binds+unbinds - overkill! */
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@ -1043,16 +1066,16 @@ rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep,
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case RPCRDMA_FRMR:
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for (i = buf->rb_max_requests * RPCRDMA_MAX_SEGS; i; i--) {
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r->r.frmr.fr_mr = ib_alloc_fast_reg_mr(ia->ri_pd,
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RPCRDMA_MAX_SEGS);
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ia->ri_max_frmr_depth);
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if (IS_ERR(r->r.frmr.fr_mr)) {
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rc = PTR_ERR(r->r.frmr.fr_mr);
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dprintk("RPC: %s: ib_alloc_fast_reg_mr"
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" failed %i\n", __func__, rc);
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goto out;
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}
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r->r.frmr.fr_pgl =
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ib_alloc_fast_reg_page_list(ia->ri_id->device,
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RPCRDMA_MAX_SEGS);
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r->r.frmr.fr_pgl = ib_alloc_fast_reg_page_list(
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ia->ri_id->device,
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ia->ri_max_frmr_depth);
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if (IS_ERR(r->r.frmr.fr_pgl)) {
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rc = PTR_ERR(r->r.frmr.fr_pgl);
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dprintk("RPC: %s: "
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@ -1498,8 +1521,8 @@ rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg,
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seg1->mr_offset -= pageoff; /* start of page */
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seg1->mr_len += pageoff;
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len = -pageoff;
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if (*nsegs > RPCRDMA_MAX_DATA_SEGS)
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*nsegs = RPCRDMA_MAX_DATA_SEGS;
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if (*nsegs > ia->ri_max_frmr_depth)
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*nsegs = ia->ri_max_frmr_depth;
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for (page_no = i = 0; i < *nsegs;) {
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rpcrdma_map_one(ia, seg, writing);
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pa = seg->mr_dma;
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@ -66,6 +66,7 @@ struct rpcrdma_ia {
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struct completion ri_done;
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int ri_async_rc;
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enum rpcrdma_memreg ri_memreg_strategy;
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unsigned int ri_max_frmr_depth;
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};
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/*
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