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xprtrdma: Prevent infinite loop in rpcrdma_ep_create()

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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: 0fc6c4e7bb ("xprtrdma: mind the device's max fast . . .")
Reported-by: Devesh Sharma <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>
Tested-by: Devesh Sharma <[email protected]>
Tested-by: Meghana Cheripady <[email protected]>
Tested-by: Veeresh U. Kokatnur <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>
This commit is contained in:
Chuck Lever 2015-03-30 14:34:12 -04:00 • committed by Anna Schumaker
commit 41f9702896
1 changed files with 3 additions and 2 deletions
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5
net/sunrpc/xprtrdma/verbs.c
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@ -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;