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authorChuck Lever <chuck.lever@oracle.com>2015-03-30 14:34:12 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2015-03-31 09:52:52 -0400
commit41f97028969e4c88efa5fcf58bc6125210413a6d (patch)
tree5cd5eb15b2696ed3cd134fb71d63393b65a8dcbf /net/sunrpc
parent805272406a980cab0e11742e5423ba97b6f38836 (diff)
xprtrdma: Prevent infinite loop in rpcrdma_ep_create()
If a provider advertizes a zero max_fast_reg_page_list_len, FRWR depth detection loops forever. Instead of just failing the mount, try other memory registration modes. Fixes: 0fc6c4e7bb28 ("xprtrdma: mind the device's max fast . . .") Reported-by: Devesh Sharma <Devesh.Sharma@Emulex.Com> 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')
-rw-r--r--net/sunrpc/xprtrdma/verbs.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 60f3317c90ee..99752b5b7354 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -618,9 +618,10 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg)
if (memreg == RPCRDMA_FRMR) {
/* Requires both frmr reg and local dma lkey */
- if ((devattr->device_cap_flags &
+ 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)) {
+ (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) ||
+ (devattr->max_fast_reg_page_list_len == 0)) {
dprintk("RPC: %s: FRMR registration "
"not supported by HCA\n", __func__);
memreg = RPCRDMA_MTHCAFMR;