svc: Add transport specific xpo_release function

The svc_sock_release function releases pages allocated to a thread. For
UDP this frees the receive skb. For RDMA it will post a receive WR
and bump the client credit count.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Acked-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Greg Banks <gnb@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

3 files changed, 11 insertions, 9 deletions

diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 37f7448c997..cfb2652f6f8 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -217,7 +217,7 @@ struct svc_rqst {
         struct auth_ops *       rq_authop;      /* authentication flavour */
         u32                     rq_flavor;      /* pseudoflavor */
         struct svc_cred         rq_cred;        /* auth info */
-        struct sk_buff *        rq_skbuff;      /* fast recv inet buffer */
+        void *                  rq_xprt_ctxt;   /* transport specific context ptr */
         struct svc_deferred_req*rq_deferred;    /* deferred request we are replaying */
 
         struct xdr_buf          rq_arg;
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 7ae6c857b05..01ee7bc2c37 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -12,6 +12,7 @@
 struct svc_xprt_ops {
         int             (*xpo_recvfrom)(struct svc_rqst *);
         int             (*xpo_sendto)(struct svc_rqst *);
+        void            (*xpo_release_rqst)(struct svc_rqst *);
 };
 
 struct svc_xprt_class {
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 7817c7eea75..d46abc89b99 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -185,14 +185,13 @@ svc_thread_dequeue(struct svc_pool *pool, struct svc_rqst *rqstp)
 /*
  * Release an skbuff after use
  */
-static inline void
-svc_release_skb(struct svc_rqst *rqstp)
+static void svc_release_skb(struct svc_rqst *rqstp)
 {
-        struct sk_buff *skb = rqstp->rq_skbuff;
+        struct sk_buff *skb = rqstp->rq_xprt_ctxt;
         struct svc_deferred_req *dr = rqstp->rq_deferred;
 
         if (skb) {
-                rqstp->rq_skbuff = NULL;
+                rqstp->rq_xprt_ctxt = NULL;
 
                 dprintk("svc: service %p, releasing skb %p\n", rqstp, skb);
                 skb_free_datagram(rqstp->rq_sock->sk_sk, skb);
@@ -395,7 +394,7 @@ svc_sock_release(struct svc_rqst *rqstp)
 {
         struct svc_sock *svsk = rqstp->rq_sock;
 
-        svc_release_skb(rqstp);
+        rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp);
 
         svc_free_res_pages(rqstp);
         rqstp->rq_res.page_len = 0;
@@ -867,7 +866,7 @@ svc_udp_recvfrom(struct svc_rqst *rqstp)
                         skb_free_datagram(svsk->sk_sk, skb);
                         return 0;
                 }
-                rqstp->rq_skbuff = skb;
+                rqstp->rq_xprt_ctxt = skb;
         }
 
         rqstp->rq_arg.page_base = 0;
@@ -903,6 +902,7 @@ svc_udp_sendto(struct svc_rqst *rqstp)
 static struct svc_xprt_ops svc_udp_ops = {
         .xpo_recvfrom = svc_udp_recvfrom,
         .xpo_sendto = svc_udp_sendto,
+        .xpo_release_rqst = svc_release_skb,
 };
 
 static struct svc_xprt_class svc_udp_class = {
@@ -1291,7 +1291,7 @@ svc_tcp_recvfrom(struct svc_rqst *rqstp)
                 rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len;
         }
 
-        rqstp->rq_skbuff      = NULL;
+        rqstp->rq_xprt_ctxt   = NULL;
         rqstp->rq_prot        = IPPROTO_TCP;
 
         /* Reset TCP read info */
@@ -1357,6 +1357,7 @@ svc_tcp_sendto(struct svc_rqst *rqstp)
 static struct svc_xprt_ops svc_tcp_ops = {
         .xpo_recvfrom = svc_tcp_recvfrom,
         .xpo_sendto = svc_tcp_sendto,
+        .xpo_release_rqst = svc_release_skb,
 };
 
 static struct svc_xprt_class svc_tcp_class = {
@@ -1578,7 +1579,7 @@ svc_send(struct svc_rqst *rqstp)
         }
 
         /* release the receive skb before sending the reply */
-        svc_release_skb(rqstp);
+        rqstp->rq_xprt->xpt_ops->xpo_release_rqst(rqstp);
 
         /* calculate over-all length */
         xb = & rqstp->rq_res;