rpc-transport/rdma: Fix 2KB as threshold size for msgs that can be transferred inline.

- Any fop/mop that can result a reply whose size is greater than this threshold
    allocates and submits a buffer along with the request to receive reply.

Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 513 (Introduce 0 copy rdma)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=513

2 files changed, 439 insertions, 58 deletions

diff --git a/xlators/protocol/client/src/Makefile.am b/xlators/protocol/client/src/Makefile.am
index f2dea68d7..29c6e9dde 100644
--- a/xlators/protocol/client/src/Makefile.am
+++ b/xlators/protocol/client/src/Makefile.am
@@ -14,4 +14,4 @@ noinst_HEADERS = client.h client-mem-types.h
 
 AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
 	-I$(top_srcdir)/libglusterfs/src -shared -nostartfiles $(GF_CFLAGS)  \
-	-I$(top_srcdir)/rpc/xdr/src -I$(top_srcdir)/rpc/rpc-lib/src/
+	-I$(top_srcdir)/rpc/xdr/src -I$(top_srcdir)/rpc/rpc-lib/src/
\ No newline at end of file
diff --git a/xlators/protocol/client/src/client3_1-fops.c b/xlators/protocol/client/src/client3_1-fops.c
index 184f67d0b..86e7fb24e 100644
--- a/xlators/protocol/client/src/client3_1-fops.c
+++ b/xlators/protocol/client/src/client3_1-fops.c
@@ -17,7 +17,6 @@
   <http://www.gnu.org/licenses/>.
 */
 
-
 #ifndef _CONFIG_H
 #define _CONFIG_H
 #include "config.h"
@@ -724,8 +723,11 @@ client3_1_getxattr_cbk (struct rpc_req *req, struct iovec *iov, int count,
         int                op_errno = EINVAL;
         gfs3_getxattr_rsp  rsp      = {0,};
         int                ret      = 0;
+        clnt_local_t    *local    = NULL;
 
         frame = myframe;
+        local = frame->local;
+        frame->local = NULL;
 
         if (-1 == req->rpc_status) {
                 op_ret   = -1;
@@ -783,6 +785,8 @@ out:
         if (dict)
                 dict_unref (dict);
 
+        client_local_wipe (local);
+
         return 0;
 }
 
@@ -798,8 +802,11 @@ client3_1_fgetxattr_cbk (struct rpc_req *req, struct iovec *iov, int count,
         int                 dict_len = 0;
         int                 op_ret   = 0;
         int                 op_errno = EINVAL;
+        clnt_local_t     *local    = NULL;
 
         frame = myframe;
+        local = frame->local;
+        frame->local = NULL;
 
         if (-1 == req->rpc_status) {
                 op_ret   = -1;
@@ -853,6 +860,9 @@ out:
         if (dict)
                 dict_unref (dict);
 
+        if (local)
+                client_local_wipe (local);
+
         return 0;
 }
 
@@ -1155,8 +1165,11 @@ client3_1_xattrop_cbk (struct rpc_req *req, struct iovec *iov, int count,
         int               op_ret   = 0;
         int               dict_len = 0;
         int               op_errno = EINVAL;
+        clnt_local_t   *local    = NULL;
 
         frame = myframe;
+        local = frame->local;
+        frame->local = NULL;
 
         if (-1 == req->rpc_status) {
                 op_ret   = -1;
@@ -1214,6 +1227,8 @@ out:
         if (dict)
                 dict_unref (dict);
 
+        client_local_wipe (local);
+
         return 0;
 }
 
@@ -1229,8 +1244,11 @@ client3_1_fxattrop_cbk (struct rpc_req *req, struct iovec *iov, int count,
         int                op_ret   = 0;
         int                dict_len = 0;
         int                op_errno = 0;
+        clnt_local_t    *local    = NULL;
 
         frame = myframe;
+        local = frame->local;
+        frame->local = NULL;
 
         if (-1 == req->rpc_status) {
                 op_ret   = -1;
@@ -1288,6 +1306,7 @@ out:
         if (dict)
                 dict_unref (dict);
 
+        client_local_wipe (local);
         return 0;
 }
 
@@ -1575,11 +1594,14 @@ client3_1_readdir_cbk (struct rpc_req *req, struct iovec *iov, int count,
                        void *myframe)
 {
         call_frame_t           *frame = NULL;
-        gfs3_readdir_rsp        rsp = {0,};
-        int32_t                 ret = 0;
+        gfs3_readdir_rsp        rsp   = {0,};
+        int32_t                 ret   = 0;
+        clnt_local_t         *local = NULL;
         gf_dirent_t             entries;
 
         frame = myframe;
+        local = frame->local;
+        frame->local = NULL;
 
         if (-1 == req->rpc_status) {
                 rsp.op_ret   = -1;
@@ -1604,6 +1626,8 @@ out:
         STACK_UNWIND_STRICT (readdir, frame, rsp.op_ret,
                              gf_error_to_errno (rsp.op_errno), &entries);
 
+        client_local_wipe (local);
+
         if (rsp.op_ret != -1) {
                 gf_dirent_free (&entries);
         }
@@ -1619,11 +1643,14 @@ client3_1_readdirp_cbk (struct rpc_req *req, struct iovec *iov, int count,
                         void *myframe)
 {
         call_frame_t           *frame = NULL;
-        gfs3_readdirp_rsp       rsp = {0,};
-        int32_t                 ret = 0;
+        gfs3_readdirp_rsp       rsp   = {0,};
+        int32_t                 ret   = 0;
+        clnt_local_t         *local = NULL;
         gf_dirent_t             entries;
 
         frame = myframe;
+        local = frame->local;
+        frame->local = NULL;
 
         if (-1 == req->rpc_status) {
                 rsp.op_ret   = -1;
@@ -1648,6 +1675,8 @@ out:
         STACK_UNWIND_STRICT (readdirp, frame, rsp.op_ret,
                              gf_error_to_errno (rsp.op_errno), &entries);
 
+        client_local_wipe (local);
+
         if (rsp.op_ret != -1) {
                 gf_dirent_free (&entries);
         }
@@ -1932,7 +1961,7 @@ client3_1_readv_cbk (struct rpc_req *req, struct iovec *iov, int count,
 {
         call_frame_t   *frame  = NULL;
         struct iobref  *iobref = NULL;
-        struct iovec    vector[MAX_IOVEC];
+        struct iovec    vector[MAX_IOVEC] = {{0}, };
         struct iatt     stat   = {0,};
         gfs3_read_rsp   rsp    = {0,};
         int             ret    = 0, rspcount = 0;
@@ -2168,7 +2197,7 @@ client3_1_lookup (call_frame_t *frame, xlator_t *this,
         size_t           dict_len          = 0;
         int              op_errno          = ESTALE;
         data_t          *content           = NULL;
-        struct iovec     vector[MAX_IOVEC];
+        struct iovec     vector[MAX_IOVEC] = {{0}, };
         int              count             = 0;
         struct iobref   *rsp_iobref        = NULL;
         struct iobuf    *rsp_iobuf         = NULL;
@@ -2245,7 +2274,7 @@ client3_1_lookup (call_frame_t *frame, xlator_t *this,
         ret = client_submit_request (this, &req, frame, conf->fops,
                                      GFS3_OP_LOOKUP, client3_1_lookup_cbk,
                                      NULL, xdr_from_lookup_req, rsphdr, count,
-                                     NULL, 0, rsp_iobref);
+                                     NULL, 0, local->iobref);
 
         if (ret) {
                 op_errno = ENOTCONN;
@@ -3695,12 +3724,18 @@ int32_t
 client3_1_fgetxattr (call_frame_t *frame, xlator_t *this,
                      void *data)
 {
-        clnt_args_t        *args     = NULL;
-        clnt_fd_ctx_t      *fdctx    = NULL;
-        clnt_conf_t        *conf     = NULL;
-        gfs3_fgetxattr_req  req      = {{0,},};
-        int                 op_errno = ESTALE;
-        int           ret        = 0;
+        clnt_args_t        *args       = NULL;
+        clnt_fd_ctx_t      *fdctx      = NULL;
+        clnt_conf_t        *conf       = NULL;
+        gfs3_fgetxattr_req  req        = {{0,},};
+        int                 op_errno   = ESTALE;
+        int                 ret        = 0;
+        int                 count      = 0;
+        clnt_local_t       *local      = NULL;
+        struct iobref      *rsp_iobref = NULL;
+        struct iobuf       *rsp_iobuf  = NULL;
+        struct iovec       *rsphdr     = NULL;
+        struct iovec        vector[MAX_IOVEC] = {{0}, };
 
         if (!frame || !this || !data)
                 goto unwind;
@@ -3729,6 +3764,42 @@ client3_1_fgetxattr (call_frame_t *frame, xlator_t *this,
                 goto unwind;
         }
 
+        local = GF_CALLOC (1, sizeof (*local),
+                           gf_client_mt_clnt_local_t);
+        if (!local) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Out of memory");
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+        frame->local = local;
+
+        rsp_iobref = iobref_new ();
+        if (rsp_iobref == NULL) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+
+        rsp_iobuf = iobuf_get (this->ctx->iobuf_pool);
+        if (rsp_iobuf == NULL) {
+                op_errno = ENOMEM;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                goto unwind;
+        }
+
+        iobref_add (rsp_iobref, rsp_iobuf);
+        iobuf_unref (rsp_iobuf);
+        rsphdr = &vector[0];
+        rsphdr->iov_base = iobuf_ptr (rsp_iobuf);
+        rsphdr->iov_len = rsp_iobuf->iobuf_arena->iobuf_pool->page_size;
+        count = 1;
+        rsp_iobuf = NULL;
+        local->iobref = rsp_iobref;
+        rsp_iobref = NULL;
+
         req.namelen = 1; /* Use it as a flag */
         req.fd   = fdctx->remote_fd;
         req.name = (char *)args->name;
@@ -3740,8 +3811,8 @@ client3_1_fgetxattr (call_frame_t *frame, xlator_t *this,
         ret = client_submit_request (this, &req, frame, conf->fops,
                                      GFS3_OP_FGETXATTR,
                                      client3_1_fgetxattr_cbk, NULL,
-                                     xdr_from_fgetxattr_req, NULL, 0,
-                                     NULL, 0, NULL);
+                                     xdr_from_fgetxattr_req, rsphdr, count,
+                                     NULL, 0, local->iobref);
         if (ret) {
                 op_errno = ENOTCONN;
                 goto unwind;
@@ -3749,7 +3820,21 @@ client3_1_fgetxattr (call_frame_t *frame, xlator_t *this,
 
         return 0;
 unwind:
+        local = frame->local;
+        frame->local = NULL;
+
         STACK_UNWIND_STRICT (fgetxattr, frame, -1, op_errno, NULL);
+
+        client_local_wipe (local);
+
+        if (rsp_iobuf) {
+                iobuf_unref (rsp_iobuf);
+        }
+
+        if (rsp_iobref) {
+                iobref_unref (rsp_iobref);
+        }
+
         return 0;
 }
 
@@ -3759,13 +3844,19 @@ int32_t
 client3_1_getxattr (call_frame_t *frame, xlator_t *this,
                     void *data)
 {
-        clnt_conf_t       *conf     = NULL;
-        clnt_args_t       *args     = NULL;
-        gfs3_getxattr_req  req      = {{0,},};
-        dict_t            *dict     = NULL;
-        int                ret      = 0;
-        int32_t            op_ret   = 0;
-        int                op_errno = ESTALE;
+        clnt_conf_t       *conf       = NULL;
+        clnt_args_t       *args       = NULL;
+        gfs3_getxattr_req  req        = {{0,},};
+        dict_t            *dict       = NULL;
+        int                ret        = 0;
+        int32_t            op_ret     = 0;
+        int                op_errno   = ESTALE;
+        int                count      = 0;
+        clnt_local_t      *local      = NULL;
+        struct iobref     *rsp_iobref = NULL;
+        struct iobuf      *rsp_iobuf  = NULL;
+        struct iovec      *rsphdr     = NULL;
+        struct iovec       vector[MAX_IOVEC] = {{0}, };
 
         if (!frame || !this || !data) {
                 op_ret   = -1;
@@ -3780,6 +3871,45 @@ client3_1_getxattr (call_frame_t *frame, xlator_t *this,
                 goto unwind;
         }
 
+        local = GF_CALLOC (1, sizeof (*local),
+                           gf_client_mt_clnt_local_t);
+        if (!local) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Out of memory");
+                op_ret = -1;
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+        frame->local = local;
+
+        rsp_iobref = iobref_new ();
+        if (rsp_iobref == NULL) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                op_ret = -1;
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+
+        rsp_iobuf = iobuf_get (this->ctx->iobuf_pool);
+        if (rsp_iobuf == NULL) {
+                op_ret = -1;
+                op_errno = ENOMEM;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                goto unwind;
+        }
+
+        iobref_add (rsp_iobref, rsp_iobuf);
+        iobuf_unref (rsp_iobuf);
+        rsphdr = &vector[0];
+        rsphdr->iov_base = iobuf_ptr (rsp_iobuf);
+        rsphdr->iov_len = rsp_iobuf->iobuf_arena->iobuf_pool->page_size;
+        count = 1;
+        rsp_iobuf = NULL;
+        local->iobref = rsp_iobref;
+        rsp_iobref = NULL;
+
         memcpy (req.gfid,  args->loc->inode->gfid, 16);
         req.namelen = 1; /* Use it as a flag */
         req.path = (char *)args->loc->path;
@@ -3814,8 +3944,8 @@ client3_1_getxattr (call_frame_t *frame, xlator_t *this,
         ret = client_submit_request (this, &req, frame, conf->fops,
                                      GFS3_OP_GETXATTR,
                                      client3_1_getxattr_cbk, NULL,
-                                     xdr_from_getxattr_req, NULL, 0,
-                                     NULL, 0, NULL);
+                                     xdr_from_getxattr_req, rsphdr, count,
+                                     NULL, 0, local->iobref);
         if (ret) {
                 op_ret   = -1;
                 op_errno = ENOTCONN;
@@ -3824,6 +3954,18 @@ client3_1_getxattr (call_frame_t *frame, xlator_t *this,
 
         return 0;
 unwind:
+        local = frame->local;
+        frame->local = NULL;
+        client_local_wipe (local);
+
+        if (rsp_iobuf) {
+                iobuf_unref (rsp_iobuf);
+        }
+
+        if (rsp_iobref) {
+                iobref_unref (rsp_iobref);
+        }
+
         STACK_UNWIND_STRICT (getxattr, frame, op_ret, op_errno, dict);
 
         return 0;
@@ -3835,12 +3977,18 @@ int32_t
 client3_1_xattrop (call_frame_t *frame, xlator_t *this,
                    void *data)
 {
-        clnt_conf_t      *conf     = NULL;
-        clnt_args_t      *args     = NULL;
-        gfs3_xattrop_req  req      = {{0,},};
-        int               ret      = 0;
-        size_t            dict_len = 0;
-        int               op_errno = ESTALE;
+        clnt_conf_t      *conf       = NULL;
+        clnt_args_t      *args       = NULL;
+        gfs3_xattrop_req  req        = {{0,},};
+        int               ret        = 0;
+        size_t            dict_len   = 0;
+        int               op_errno   = ESTALE;
+        int               count      = 0;
+        clnt_local_t   *local      = NULL;
+        struct iobref    *rsp_iobref = NULL;
+        struct iobuf     *rsp_iobuf  = NULL;
+        struct iovec     *rsphdr     = NULL;
+        struct iovec      vector[MAX_IOVEC] = {{0}, };
 
         if (!frame || !this || !data)
                 goto unwind;
@@ -3850,6 +3998,42 @@ client3_1_xattrop (call_frame_t *frame, xlator_t *this,
         if (!(args->loc && args->loc->inode))
                 goto unwind;
 
+        local = GF_CALLOC (1, sizeof (*local),
+                           gf_client_mt_clnt_local_t);
+        if (!local) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Out of memory");
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+        frame->local = local;
+
+        rsp_iobref = iobref_new ();
+        if (rsp_iobref == NULL) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+
+        rsp_iobuf = iobuf_get (this->ctx->iobuf_pool);
+        if (rsp_iobuf == NULL) {
+                op_errno = ENOMEM;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                goto unwind;
+        }
+
+        iobref_add (rsp_iobref, rsp_iobuf);
+        iobuf_unref (rsp_iobuf);
+        rsphdr = &vector[0];
+        rsphdr->iov_base = iobuf_ptr (rsp_iobuf);
+        rsphdr->iov_len = rsp_iobuf->iobuf_arena->iobuf_pool->page_size;
+        count = 1;
+        rsp_iobuf = NULL;
+        local->iobref = rsp_iobref;
+        rsp_iobref = NULL;
+
         memcpy (req.gfid,  args->loc->inode->gfid, 16);
         if (args->dict) {
                 ret = dict_allocate_and_serialize (args->dict,
@@ -3871,8 +4055,8 @@ client3_1_xattrop (call_frame_t *frame, xlator_t *this,
         ret = client_submit_request (this, &req, frame, conf->fops,
                                      GFS3_OP_XATTROP,
                                      client3_1_xattrop_cbk, NULL,
-                                     xdr_from_xattrop_req, NULL, 0,
-                                     NULL, 0, NULL);
+                                     xdr_from_xattrop_req, rsphdr, count,
+                                     NULL, 0, local->iobref);
         if (ret) {
                 op_errno = ENOTCONN;
                 goto unwind;
@@ -3883,10 +4067,25 @@ client3_1_xattrop (call_frame_t *frame, xlator_t *this,
         }
         return 0;
 unwind:
+        local = frame->local;
+        frame->local = NULL;
+
         STACK_UNWIND_STRICT (xattrop, frame, -1, op_errno, NULL);
+
         if (req.dict.dict_val) {
                 GF_FREE (req.dict.dict_val);
         }
+
+        client_local_wipe (local);
+
+        if (rsp_iobuf) {
+                iobuf_unref (rsp_iobuf);
+        }
+
+        if (rsp_iobref) {
+                iobref_unref (rsp_iobref);
+        }
+
         return 0;
 }
 
@@ -3896,13 +4095,19 @@ int32_t
 client3_1_fxattrop (call_frame_t *frame, xlator_t *this,
                     void *data)
 {
-        clnt_args_t       *args     = NULL;
-        clnt_fd_ctx_t     *fdctx    = NULL;
-        clnt_conf_t       *conf     = NULL;
-        gfs3_fxattrop_req  req      = {{0,},};
-        int                op_errno = ESTALE;
-        int                ret      = 0;
-        size_t             dict_len = 0;
+        clnt_args_t       *args       = NULL;
+        clnt_fd_ctx_t     *fdctx      = NULL;
+        clnt_conf_t       *conf       = NULL;
+        gfs3_fxattrop_req  req        = {{0,},};
+        int                op_errno   = ESTALE;
+        int                ret        = 0;
+        size_t             dict_len   = 0;
+        int                count      = 0;
+        clnt_local_t    *local      = NULL;
+        struct iobref     *rsp_iobref = NULL;
+        struct iobuf      *rsp_iobuf  = NULL;
+        struct iovec      *rsphdr     = NULL;
+        struct iovec       vector[MAX_IOVEC] = {{0}, };
 
         if (!frame || !this || !data)
                 goto unwind;
@@ -3935,6 +4140,42 @@ client3_1_fxattrop (call_frame_t *frame, xlator_t *this,
         req.flags  = args->flags;
         memcpy (req.gfid,  args->fd->inode->gfid, 16);
 
+        local = GF_CALLOC (1, sizeof (*local),
+                           gf_client_mt_clnt_local_t);
+        if (!local) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "Out of memory");
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+        frame->local = local;
+
+        rsp_iobref = iobref_new ();
+        if (rsp_iobref == NULL) {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                op_errno = ENOMEM;
+                goto unwind;
+        }
+
+        rsp_iobuf = iobuf_get (this->ctx->iobuf_pool);
+        if (rsp_iobuf == NULL) {
+                op_errno = ENOMEM;
+                gf_log (this->name, GF_LOG_ERROR,
+                        "out of memory");
+                goto unwind;
+        }
+
+        iobref_add (rsp_iobref, rsp_iobuf);
+        iobuf_unref (rsp_iobuf);
+        rsphdr = &vector[0];
+        rsphdr->iov_base = iobuf_ptr (rsp_iobuf);
+        rsphdr->iov_len = rsp_iobuf->iobuf_arena->iobuf_pool->page_size;
+        count = 1;
+        rsp_iobuf = NULL;
+        local->iobref = rsp_iobref;
+        rsp_iobref = NULL;
+
         if (args->dict) {
                 ret = dict_allocate_and_serialize (args->dict,
                                                    &req.dict.dict_val,
@@ -3950,8 +4191,8 @@ client3_1_fxattrop (call_frame_t *frame, xlator_t *this,
         ret = client_submit_request (this, &req, frame, conf->fops,
                                      GFS3_OP_FXATTROP,
                                      client3_1_fxattrop_cbk, NULL,
-                                     xdr_from_fxattrop_req, NULL, 0, NULL, 0,
-                                     NULL);
+                                     xdr_from_fxattrop_req, rsphdr, count,
+                                     NULL, 0, local->iobref);
         if (ret) {
                 op_errno = ENOTCONN;
                 goto unwind;
@@ -3963,10 +4204,25 @@ client3_1_fxattrop (call_frame_t *frame, xlator_t *this,
 
         return 0;
 unwind:
+        local = frame->local;
+        frame->local = NULL;
+
         STACK_UNWIND_STRICT (fxattrop, frame, -1, op_errno, NULL);
+
         if (req.dict.dict_val) {
                 GF_FREE (req.dict.dict_val);
         }
+
+        client_local_wipe (local);
+
+        if (rsp_iobref) {
+                iobref_unref (rsp_iobref);
+        }
+
+        if (rsp_iobuf) {
+                iobuf_unref (rsp_iobuf);
+        }
+
         return 0;
 }
 
@@ -4441,12 +4697,20 @@ int32_t
 client3_1_readdir (call_frame_t *frame, xlator_t *this,
                    void *data)
 {
-        clnt_args_t      *args     = NULL;
-        clnt_fd_ctx_t    *fdctx    = NULL;
-        clnt_conf_t      *conf     = NULL;
-        gfs3_readdir_req  req      = {{0,},};
-        int               op_errno = ESTALE;
+        clnt_args_t      *args       = NULL;
+        clnt_fd_ctx_t    *fdctx      = NULL;
+        clnt_conf_t      *conf       = NULL;
+        gfs3_readdir_req  req        = {{0,},};
+        gfs3_readdir_rsp  rsp        = {0, };
+        clnt_local_t     *local      = NULL;
+        int               op_errno   = ESTALE;
         int               ret        = 0;
+        int               count      = 0;
+        struct iobref    *rsp_iobref = NULL;
+        struct iobuf     *rsp_iobuf  = NULL;
+        struct iovec     *rsphdr     = NULL;
+        struct iovec      vector[MAX_IOVEC] = {{0}, };
+        int               readdir_rsp_size  = 0; 
 
         if (!frame || !this || !data)
                 goto unwind;
@@ -4475,6 +4739,46 @@ client3_1_readdir (call_frame_t *frame, xlator_t *this,
                 goto unwind;
         }
 
+        readdir_rsp_size = xdr_sizeof ((xdrproc_t) xdr_gfs3_readdir_rsp, &rsp)
+                + args->size;
+
+        if ((readdir_rsp_size + GLUSTERFS_RPC_REPLY_SIZE + GLUSTERFS_RDMA_MAX_HEADER_SIZE)
+            > (GLUSTERFS_RDMA_INLINE_THRESHOLD)) {
+                local = GF_CALLOC (1, sizeof (*local),
+                                   gf_client_mt_clnt_local_t);
+                if (!local) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Out of memory");
+                        op_errno = ENOMEM;
+                        goto unwind;
+                }
+                frame->local = local;
+
+                rsp_iobref = iobref_new ();
+                if (rsp_iobref == NULL) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "out of memory");
+                        goto unwind;
+                }
+
+                rsp_iobuf = iobuf_get (this->ctx->iobuf_pool);
+                if (rsp_iobuf == NULL) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "out of memory");
+                        goto unwind;
+                }
+
+                iobref_add (rsp_iobref, rsp_iobuf);
+                iobuf_unref (rsp_iobuf);
+                rsphdr = &vector[0];
+                rsphdr->iov_base = iobuf_ptr (rsp_iobuf);
+                rsphdr->iov_len
+                        = rsp_iobuf->iobuf_arena->iobuf_pool->page_size;
+                count = 1;
+                rsp_iobuf = NULL;
+                local->iobref = rsp_iobref;
+        }
+
         req.size = args->size;
         req.offset = args->offset;
         req.fd = fdctx->remote_fd;
@@ -4482,15 +4786,30 @@ client3_1_readdir (call_frame_t *frame, xlator_t *this,
         ret = client_submit_request (this, &req, frame, conf->fops,
                                      GFS3_OP_READDIR,
                                      client3_1_readdir_cbk, NULL,
-                                     xdr_from_readdir_req, NULL, 0, NULL, 0,
-                                     NULL);
+                                     xdr_from_readdir_req, rsphdr, count,
+                                     NULL, 0, rsp_iobref);
+        rsp_iobref = NULL;
+
         if (ret) {
                 op_errno = ENOTCONN;
                 goto unwind;
         }
 
         return 0;
+
 unwind:
+        local = frame->local;
+        frame->local = NULL;
+        client_local_wipe (local);
+
+        if (rsp_iobref != NULL) {
+                iobref_unref (rsp_iobref);
+        }
+
+        if (rsp_iobuf != NULL) {
+                iobuf_unref (rsp_iobuf);
+        }
+
         STACK_UNWIND_STRICT (readdir, frame, -1, op_errno, NULL);
         return 0;
 }
@@ -4500,12 +4819,20 @@ int32_t
 client3_1_readdirp (call_frame_t *frame, xlator_t *this,
                     void *data)
 {
-        clnt_args_t       *args     = NULL;
-        gfs3_readdirp_req  req      = {{0,},};
-        clnt_fd_ctx_t     *fdctx    = NULL;
-        clnt_conf_t       *conf     = NULL;
-        int                op_errno = ESTALE;
-        int                ret        = 0;
+        clnt_args_t      *args              = NULL;
+        gfs3_readdirp_req req               = {{0,},};
+        gfs3_readdirp_rsp rsp               = {0,};
+        clnt_fd_ctx_t    *fdctx             = NULL;
+        clnt_conf_t      *conf              = NULL;
+        int               op_errno          = ESTALE;
+        int               ret               = 0;
+        int               count             = 0;
+        int               readdirp_rsp_size = 0;
+        struct iobref    *rsp_iobref        = NULL;
+        struct iobuf     *rsp_iobuf         = NULL;
+        struct iovec     *rsphdr            = NULL;
+        struct iovec      vector[MAX_IOVEC] = {{0}, };
+        clnt_local_t     *local             = NULL;
 
         if (!frame || !this || !data)
                 goto unwind;
@@ -4534,6 +4861,48 @@ client3_1_readdirp (call_frame_t *frame, xlator_t *this,
                 goto unwind;
         }
 
+        readdirp_rsp_size = xdr_sizeof ((xdrproc_t) xdr_gfs3_readdirp_rsp, &rsp)
+                + args->size;
+
+        if ((readdirp_rsp_size + GLUSTERFS_RPC_REPLY_SIZE
+             + GLUSTERFS_RDMA_MAX_HEADER_SIZE)
+            > (GLUSTERFS_RDMA_INLINE_THRESHOLD)) {
+                local = GF_CALLOC (1, sizeof (*local),
+                                   gf_client_mt_clnt_local_t);
+                if (!local) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "Out of memory");
+                        op_errno = ENOMEM;
+                        goto unwind;
+                }
+                frame->local = local;
+
+                rsp_iobref = iobref_new ();
+                if (rsp_iobref == NULL) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "out of memory");
+                        goto unwind;
+                }
+
+                rsp_iobuf = iobuf_get (this->ctx->iobuf_pool);
+                if (rsp_iobuf == NULL) {
+                        gf_log (this->name, GF_LOG_ERROR,
+                                "out of memory");
+                        goto unwind;
+                }
+
+                iobref_add (rsp_iobref, rsp_iobuf);
+                iobuf_unref (rsp_iobuf);
+                rsphdr = &vector[0];
+                rsphdr->iov_base = iobuf_ptr (rsp_iobuf);
+                rsphdr->iov_len
+                        = rsp_iobuf->iobuf_arena->iobuf_pool->page_size;
+                count = 1;
+                rsp_iobuf = NULL;
+                local->iobref = rsp_iobref;
+                rsp_iobref = NULL;
+        }
+
         req.size = args->size;
         req.offset = args->offset;
         req.fd = fdctx->remote_fd;
@@ -4541,8 +4910,8 @@ client3_1_readdirp (call_frame_t *frame, xlator_t *this,
         ret = client_submit_request (this, &req, frame, conf->fops,
                                      GFS3_OP_READDIRP,
                                      client3_1_readdirp_cbk, NULL,
-                                     xdr_from_readdirp_req, NULL, 0, NULL, 0,
-                                     NULL);
+                                     xdr_from_readdirp_req, rsphdr, count, NULL,
+                                     0, rsp_iobref);
         if (ret) {
                 op_errno = ENOTCONN;
                 goto unwind;
@@ -4550,6 +4919,18 @@ client3_1_readdirp (call_frame_t *frame, xlator_t *this,
 
         return 0;
 unwind:
+        local = frame->local;
+        frame->local = NULL;
+        client_local_wipe (local);
+
+        if (rsp_iobref) {
+                iobref_unref (rsp_iobref);
+        }
+
+        if (rsp_iobuf) {
+                iobuf_unref (rsp_iobuf);
+        }
+
         STACK_UNWIND_STRICT (readdirp, frame, -1, op_errno, NULL);
         return 0;
 }