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1c9351ee0e
The max_payload computation is generalized to ensure that the payload maximum is the lesser of RPC_MAX_DATA_SEGS and the number of data segments that can be transmitted in an inline buffer. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Sagi Grimberg <sagig@mellanox.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>
36 lines
966 B
C
36 lines
966 B
C
/*
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* Copyright (c) 2015 Oracle. All rights reserved.
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* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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*/
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/* Lightweight memory registration using Fast Memory Regions (FMR).
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* Referred to sometimes as MTHCAFMR mode.
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*
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* FMR uses synchronous memory registration and deregistration.
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* FMR registration is known to be fast, but FMR deregistration
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* can take tens of usecs to complete.
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*/
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#include "xprt_rdma.h"
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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/* Maximum scatter/gather per FMR */
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#define RPCRDMA_MAX_FMR_SGES (64)
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/* FMR mode conveys up to 64 pages of payload per chunk segment.
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*/
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static size_t
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fmr_op_maxpages(struct rpcrdma_xprt *r_xprt)
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{
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return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
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rpcrdma_max_segments(r_xprt) * RPCRDMA_MAX_FMR_SGES);
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}
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const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = {
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.ro_maxpages = fmr_op_maxpages,
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.ro_displayname = "fmr",
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};
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