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| author | Chuck Lever | 2015-03-30 20:34:30 +0200 |
|---|---|---|
| committer | Anna Schumaker | 2015-03-31 15:52:52 +0200 |
| commit | 1c9351ee0e346ec1b3c700a4bc8f881923e1808e (patch) | |
| tree | 2ed88d5862cab405742db7e97efe6532c4e1e73f /net/sunrpc/xprtrdma/fmr_ops.c | |
| parent | xprtrdma: Add vector of ops for each memory registration strategy (diff) | |
| download | kernel-qcow2-linux-1c9351ee0e346ec1b3c700a4bc8f881923e1808e.tar.gz kernel-qcow2-linux-1c9351ee0e346ec1b3c700a4bc8f881923e1808e.tar.xz kernel-qcow2-linux-1c9351ee0e346ec1b3c700a4bc8f881923e1808e.zip | |
xprtrdma: Add a "max_payload" op for each memreg mode
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>
Diffstat (limited to 'net/sunrpc/xprtrdma/fmr_ops.c')
| -rw-r--r-- | net/sunrpc/xprtrdma/fmr_ops.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c index ffb7d9358480..eec266055b28 100644 --- a/net/sunrpc/xprtrdma/fmr_ops.c +++ b/net/sunrpc/xprtrdma/fmr_ops.c @@ -17,6 +17,19 @@ # define RPCDBG_FACILITY RPCDBG_TRANS #endif +/* Maximum scatter/gather per FMR */ +#define RPCRDMA_MAX_FMR_SGES (64) + +/* FMR mode conveys up to 64 pages of payload per chunk segment. + */ +static size_t +fmr_op_maxpages(struct rpcrdma_xprt *r_xprt) +{ + return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS, + rpcrdma_max_segments(r_xprt) * RPCRDMA_MAX_FMR_SGES); +} + const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops = { + .ro_maxpages = fmr_op_maxpages, .ro_displayname = "fmr", }; |