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authorChuck Lever <chuck.lever@oracle.com>2014-05-28 10:32:51 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2014-06-04 08:56:39 -0400
commitf10eafd3a6ce9da7e96999c124b643ea6c4921f3 (patch)
tree802a9de893546367458883a1f97dc8b7ca83ba26 /net/sunrpc
parent0ac531c1832318efa3dc3d723e356a7e09330e80 (diff)
downloadlinux-f10eafd3a6ce9da7e96999c124b643ea6c4921f3.tar.bz2
xprtrdma: Fall back to MTHCAFMR when FRMR is not supported
An audit of in-kernel RDMA providers that do not support the FRMR memory registration shows that several of them support MTHCAFMR. Prefer MTHCAFMR when FRMR is not supported. If MTHCAFMR is not supported, only then choose ALLPHYSICAL. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/xprtrdma/verbs.c31
1 files changed, 15 insertions, 16 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 6bb9a07f7d49..a3527989f5b3 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -491,33 +491,32 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey;
}
- switch (memreg) {
- case RPCRDMA_MTHCAFMR:
- if (!ia->ri_id->device->alloc_fmr) {
- dprintk("RPC: %s: MTHCAFMR registration "
- "specified but not supported by adapter, "
- "using riskier RPCRDMA_ALLPHYSICAL\n",
- __func__);
- memreg = RPCRDMA_ALLPHYSICAL;
- }
- break;
- case RPCRDMA_FRMR:
+ if (memreg == RPCRDMA_FRMR) {
/* Requires both frmr reg and local dma lkey */
if ((devattr.device_cap_flags &
(IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) !=
(IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) {
dprintk("RPC: %s: FRMR registration "
- "specified but not supported by adapter, "
- "using riskier RPCRDMA_ALLPHYSICAL\n",
- __func__);
- memreg = RPCRDMA_ALLPHYSICAL;
+ "not supported by HCA\n", __func__);
+ memreg = RPCRDMA_MTHCAFMR;
} else {
/* Mind the ia limit on FRMR page list depth */
ia->ri_max_frmr_depth = min_t(unsigned int,
RPCRDMA_MAX_DATA_SEGS,
devattr.max_fast_reg_page_list_len);
}
- break;
+ }
+ if (memreg == RPCRDMA_MTHCAFMR) {
+ if (!ia->ri_id->device->alloc_fmr) {
+ dprintk("RPC: %s: MTHCAFMR registration "
+ "not supported by HCA\n", __func__);
+#if RPCRDMA_PERSISTENT_REGISTRATION
+ memreg = RPCRDMA_ALLPHYSICAL;
+#else
+ rc = -EINVAL;
+ goto out2;
+#endif
+ }
}
/*