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authorChuck Lever <chuck.lever@oracle.com>2014-07-29 17:23:34 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2014-07-31 16:22:52 -0400
commit43e95988178ed70a878a5be6be9ad248342dbf7d (patch)
tree03944907357c8eebeea55f5c0dcba2339c2feea1 /net/sunrpc/xprtrdma/verbs.c
parent73806c8832b3438ef0439603dab1f3cfc61cb6cd (diff)
xprtrdma: Limit data payload size for ALLPHYSICAL
When the client uses physical memory registration, each page in the payload gets its own array entry in the RPC/RDMA header's chunk list. Therefore, don't advertise a maximum payload size that would require more array entries than can fit in the RPC buffer where RPC/RDMA headers are built. BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=248 Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Tested-by: Steve Wise <swise@opengridcomputing.com> Tested-by: Shirley Ma <shirley.ma@oracle.com> Tested-by: Devesh Sharma <devesh.sharma@emulex.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/xprtrdma/verbs.c')
-rw-r--r--net/sunrpc/xprtrdma/verbs.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index aa08de89de42..13ff87400203 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1825,3 +1825,44 @@ rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
1825 rc); 1825 rc);
1826 return rc; 1826 return rc;
1827} 1827}
1828
1829/* Physical mapping means one Read/Write list entry per-page.
1830 * All list entries must fit within an inline buffer
1831 *
1832 * NB: The server must return a Write list for NFS READ,
1833 * which has the same constraint. Factor in the inline
1834 * rsize as well.
1835 */
1836static size_t
1837rpcrdma_physical_max_payload(struct rpcrdma_xprt *r_xprt)
1838{
1839 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
1840 unsigned int inline_size, pages;
1841
1842 inline_size = min_t(unsigned int,
1843 cdata->inline_wsize, cdata->inline_rsize);
1844 inline_size -= RPCRDMA_HDRLEN_MIN;
1845 pages = inline_size / sizeof(struct rpcrdma_segment);
1846 return pages << PAGE_SHIFT;
1847}
1848
1849static size_t
1850rpcrdma_mr_max_payload(struct rpcrdma_xprt *r_xprt)
1851{
1852 return RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT;
1853}
1854
1855size_t
1856rpcrdma_max_payload(struct rpcrdma_xprt *r_xprt)
1857{
1858 size_t result;
1859
1860 switch (r_xprt->rx_ia.ri_memreg_strategy) {
1861 case RPCRDMA_ALLPHYSICAL:
1862 result = rpcrdma_physical_max_payload(r_xprt);
1863 break;
1864 default:
1865 result = rpcrdma_mr_max_payload(r_xprt);
1866 }
1867 return result;
1868}