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xprtrdma: Add a "max_payload" op for each memreg mode

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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>
This commit is contained in:
Chuck Lever
2015-03-30 14:34:30 -04:00
committed by Anna Schumaker
parent a0ce85f595
commit 1c9351ee0e
6 changed files with 59 additions and 36 deletions
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13
net/sunrpc/xprtrdma/fmr_ops.c
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@@ -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",
};