Both commit 0380a3f375 ("svcrdma: Add a separate "max data segs" macro for svcrdma") and commit 7e5be28827bf ("svcrdma: advertise the correct max payload") are incorrect. This commit reverts both changes, restoring the server's maximum payload size to 1MB. Commit 7e5be28827bf based the server's maximum payload on the _client's_ RPCRDMA_MAX_DATA_SEGS value. That was wrong. Commit 0380a3f375 tried to fix this so that the client maximum payload size could be raised without affecting the server, but managed to confuse matters more on the server side. More importantly, limiting the advertised maximum payload size was meant to be a workaround, not the actual fix. We need to revisit https://bugzilla.linux-nfs.org/show_bug.cgi?id=270 A Linux client on a platform with 64KB pages can overrun and crash an x86_64 NFS/RDMA server when the r/wsize is 1MB. An x86/64 Linux client seems to work fine using 1MB reads and writes when the Linux server's maximum payload size is restored to 1MB. BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=270 Fixes: 0380a3f375 ("svcrdma: Add a separate "max data segs" macro") Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> --- Hi Bruce- I notice you still have "svcrdma: Boost NFS READ/WRITE payload size maximum" in both your nfsd-next and for-4.3 branches. Can you please replace that patch with this one? This patch uses the approach we agreed on several weeks ago. Thanks! include/linux/sunrpc/svc_rdma.h | 9 ++------- net/sunrpc/xprtrdma/svc_rdma_transport.c | 2 +- net/sunrpc/xprtrdma/xprt_rdma.h | 1 - 3 files changed, 3 insertions(+), 9 deletions(-) diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h index 13af61b..d5ee6d8 100644 --- a/include/linux/sunrpc/svc_rdma.h +++ b/include/linux/sunrpc/svc_rdma.h @@ -172,13 +172,6 @@ struct svcxprt_rdma { #define RDMAXPRT_SQ_PENDING 2 #define RDMAXPRT_CONN_PENDING 3 -#define RPCRDMA_MAX_SVC_SEGS (64) /* server max scatter/gather */ -#if RPCSVC_MAXPAYLOAD < (RPCRDMA_MAX_SVC_SEGS << PAGE_SHIFT) -#define RPCRDMA_MAXPAYLOAD RPCSVC_MAXPAYLOAD -#else -#define RPCRDMA_MAXPAYLOAD (RPCRDMA_MAX_SVC_SEGS << PAGE_SHIFT) -#endif - #define RPCRDMA_LISTEN_BACKLOG 10 /* The default ORD value is based on two outstanding full-size writes with a * page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ. */ @@ -187,6 +180,8 @@ struct svcxprt_rdma { #define RPCRDMA_MAX_REQUESTS 32 #define RPCRDMA_MAX_REQ_SIZE 4096 +#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD + /* svc_rdma_marshal.c */ extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg **, struct svc_rqst *); extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *, diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index 4054a9d..21e4036 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -91,7 +91,7 @@ struct svc_xprt_class svc_rdma_class = { .xcl_name = "rdma", .xcl_owner = THIS_MODULE, .xcl_ops = &svc_rdma_ops, - .xcl_max_payload = RPCRDMA_MAXPAYLOAD, + .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, .xcl_ident = XPRT_TRANSPORT_RDMA, }; diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h index f49dd8b..e718d09 100644 --- a/net/sunrpc/xprtrdma/xprt_rdma.h +++ b/net/sunrpc/xprtrdma/xprt_rdma.h @@ -51,7 +51,6 @@ #include <linux/sunrpc/clnt.h> /* rpc_xprt */ #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ -#include <linux/sunrpc/svc.h> /* RPCSVC_MAXPAYLOAD */ #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html