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author | Chuck Lever | 2015-03-30 20:34:39 +0200 |
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committer | Anna Schumaker | 2015-03-31 15:52:52 +0200 |
commit | 9c1b4d775f2d7dd5bb806e3de2f3e1244a7cbd16 (patch) | |
tree | 19918df86e24602bb055ff6e5be6fba6cf3b2f25 /net/sunrpc/xprtrdma/fmr_ops.c | |
parent | xprtrdma: Add a "max_payload" op for each memreg mode (diff) | |
download | kernel-qcow2-linux-9c1b4d775f2d7dd5bb806e3de2f3e1244a7cbd16.tar.gz kernel-qcow2-linux-9c1b4d775f2d7dd5bb806e3de2f3e1244a7cbd16.tar.xz kernel-qcow2-linux-9c1b4d775f2d7dd5bb806e3de2f3e1244a7cbd16.zip |
xprtrdma: Add a "register_external" op for each memreg mode
There is very little common processing among the different external
memory registration functions. Have rpcrdma_create_chunks() call
the registration method directly. This removes a stack frame and a
switch statement from the external registration path.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Devesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/xprtrdma/fmr_ops.c')
-rw-r--r-- | net/sunrpc/xprtrdma/fmr_ops.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c index eec266055b28..45fb646a6d36 100644 --- a/net/sunrpc/xprtrdma/fmr_ops.c +++ b/net/sunrpc/xprtrdma/fmr_ops.c @@ -29,7 +29,58 @@ fmr_op_maxpages(struct rpcrdma_xprt *r_xprt) rpcrdma_max_segments(r_xprt) * RPCRDMA_MAX_FMR_SGES); } +/* Use the ib_map_phys_fmr() verb to register a memory region + * for remote access via RDMA READ or RDMA WRITE. + */ +static int +fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg, + int nsegs, bool writing) +{ + struct rpcrdma_ia *ia = &r_xprt->rx_ia; + struct rpcrdma_mr_seg *seg1 = seg; + struct rpcrdma_mw *mw = seg1->rl_mw; + u64 physaddrs[RPCRDMA_MAX_DATA_SEGS]; + int len, pageoff, i, rc; + + pageoff = offset_in_page(seg1->mr_offset); + seg1->mr_offset -= pageoff; /* start of page */ + seg1->mr_len += pageoff; + len = -pageoff; + if (nsegs > RPCRDMA_MAX_FMR_SGES) + nsegs = RPCRDMA_MAX_FMR_SGES; + for (i = 0; i < nsegs;) { + rpcrdma_map_one(ia, seg, writing); + physaddrs[i] = seg->mr_dma; + len += seg->mr_len; + ++seg; + ++i; + /* Check for holes */ + if ((i < nsegs && offset_in_page(seg->mr_offset)) || + offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len)) + break; + } + + rc = ib_map_phys_fmr(mw->r.fmr, physaddrs, i, seg1->mr_dma); + if (rc) + goto out_maperr; + + seg1->mr_rkey = mw->r.fmr->rkey; + seg1->mr_base = seg1->mr_dma + pageoff; + seg1->mr_nsegs = i; + seg1->mr_len = len; + return i; + +out_maperr: + dprintk("RPC: %s: ib_map_phys_fmr %u@0x%llx+%i (%d) status %i\n", + __func__, len, (unsigned long long)seg1->mr_dma, + pageoff, i, rc); + while (i--) + rpcrdma_unmap_one(ia, --seg); + return rc; +} + const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = { + .ro_map = fmr_op_map, .ro_maxpages = fmr_op_maxpages, .ro_displayname = "fmr", }; |