On Fri, 2009-09-04 at 19:31 +0300, Benny Halevy wrote:
> From: Rahul Iyer <iyer@xxxxxxxxxx>
>
> Signed-off-by: Rahul Iyer <iyer@xxxxxxxxxx>
> Signed-off-by: Mike Sager <sager@xxxxxxxxxx>
> Signed-off-by: Marc Eshel <eshel@xxxxxxxxxxxxxxx>
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
>
> When the call direction is a reply, copy the xid and call direction into the
> req->rq_private_buf.head[0].iov_base otherwise rpc_verify_header returns
> rpc_garbage.
>
> Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> [get rid of CONFIG_NFSD_V4_1]
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> [sunrpc: refactoring of svc_tcp_recvfrom]
> Signed-off-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: create common send routine for the fore and the back channels]
> Signed-off-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: Use free_page() to free server backchannel pages]
> Signed-off-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
OK... Let's not go overboard with all the 'Signed-off-by's here... I'm
sure this ping-ponging between Alexandros and Ricardo can be
consolidated a bit. Particularly given that they work for the same
company...
> [nfsd41: sunrpc: Document server backchannel locking]
> Signed-off-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: remove bc_connect_worker()]
> Signed-off-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: Define xprt_server_backchannel()[
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: remove bc_close and bc_init_auto_disconnect dummy functions]
> Signed-off-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: eliminate unneeded switch statement in xs_setup_tcp()]
> Signed-off-by: Alexandros Batsakis <batsakis@xxxxxxxxxx>
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: Don't auto close the server backchannel connection]
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> [nfsd41: sunrpc: Remove unused functions]
> Signed-off-by: Ricardo Labiaga <Ricardo.Labiaga@xxxxxxxxxx>
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> [nfsd41: change bc_sock to bc_xprt]
> [nfsd41: sunrpc: move struct rpc_buffer def into a common header file]
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> [nfsd41: sunrpc: use rpc_sleep in bc_send_request so not to block on mutex]
> [removed cosmetic changes]
> Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
> Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxx>
> ---
> include/linux/sunrpc/clnt.h | 1 +
> include/linux/sunrpc/svc_xprt.h | 1 +
> include/linux/sunrpc/svcsock.h | 1 +
> include/linux/sunrpc/xprt.h | 7 ++
> net/sunrpc/clnt.c | 1 +
> net/sunrpc/sunrpc.h | 4 +
> net/sunrpc/svc_xprt.c | 2 +
> net/sunrpc/svcsock.c | 172 +++++++++++++++++++++++++++-------
> net/sunrpc/xprt.c | 13 +++
> net/sunrpc/xprtsock.c | 198 +++++++++++++++++++++++++++++++++++++-
> 10 files changed, 359 insertions(+), 41 deletions(-)
>
> diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
> index 3d02558..8ed9642 100644
> --- a/include/linux/sunrpc/clnt.h
> +++ b/include/linux/sunrpc/clnt.h
> @@ -114,6 +114,7 @@ struct rpc_create_args {
> rpc_authflavor_t authflavor;
> unsigned long flags;
> char *client_name;
> + struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
> };
>
> /* Values for "flags" field */
> diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
> index 2223ae0..5f4e18b 100644
> --- a/include/linux/sunrpc/svc_xprt.h
> +++ b/include/linux/sunrpc/svc_xprt.h
> @@ -65,6 +65,7 @@ struct svc_xprt {
> size_t xpt_locallen; /* length of address */
> struct sockaddr_storage xpt_remote; /* remote peer's address */
> size_t xpt_remotelen; /* length of address */
> + struct rpc_wait_queue xpt_bc_pending; /* backchannel wait queue */
> };
>
> int svc_reg_xprt_class(struct svc_xprt_class *);
> diff --git a/include/linux/sunrpc/svcsock.h b/include/linux/sunrpc/svcsock.h
> index 04dba23..4b854e2 100644
> --- a/include/linux/sunrpc/svcsock.h
> +++ b/include/linux/sunrpc/svcsock.h
> @@ -28,6 +28,7 @@ struct svc_sock {
> /* private TCP part */
> u32 sk_reclen; /* length of record */
> u32 sk_tcplen; /* current read length */
> + struct rpc_xprt *sk_bc_xprt; /* NFSv4.1 backchannel xprt */
> };
>
> /*
> diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
> index c090df4..cfad635 100644
> --- a/include/linux/sunrpc/xprt.h
> +++ b/include/linux/sunrpc/xprt.h
> @@ -179,6 +179,7 @@ struct rpc_xprt {
> spinlock_t reserve_lock; /* lock slot table */
> u32 xid; /* Next XID value to use */
> struct rpc_task * snd_task; /* Task blocked in send */
> + struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
> #if defined(CONFIG_NFS_V4_1)
> struct svc_serv *bc_serv; /* The RPC service which will */
> /* process the callback */
> @@ -231,6 +232,7 @@ struct xprt_create {
> struct sockaddr * srcaddr; /* optional local address */
> struct sockaddr * dstaddr; /* remote peer address */
> size_t addrlen;
> + struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
> };
>
> struct xprt_class {
> @@ -366,6 +368,11 @@ static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
> return test_and_set_bit(XPRT_BINDING, &xprt->state);
> }
>
> +static inline int xprt_server_backchannel(struct rpc_xprt *xprt)
> +{
> + return xprt->bc_xprt != NULL;
> +}
xprt_is_server_backchannel()? When I see a function with a name like the
above, I tend to assume it will actually return a backchannel object.
> +
> #endif /* __KERNEL__*/
>
> #endif /* _LINUX_SUNRPC_XPRT_H */
> diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
> index c1e467e..7389804 100644
> --- a/net/sunrpc/clnt.c
> +++ b/net/sunrpc/clnt.c
> @@ -288,6 +288,7 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
> .srcaddr = args->saddress,
> .dstaddr = args->address,
> .addrlen = args->addrsize,
> + .bc_xprt = args->bc_xprt,
> };
> char servername[48];
>
> diff --git a/net/sunrpc/sunrpc.h b/net/sunrpc/sunrpc.h
> index 13171e6..90c292e 100644
> --- a/net/sunrpc/sunrpc.h
> +++ b/net/sunrpc/sunrpc.h
> @@ -43,5 +43,9 @@ static inline int rpc_reply_expected(struct rpc_task *task)
> (task->tk_msg.rpc_proc->p_decode != NULL);
> }
>
> +int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
> + struct page *headpage, unsigned long headoffset,
> + struct page *tailpage, unsigned long tailoffset);
> +
> #endif /* _NET_SUNRPC_SUNRPC_H */
>
> diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
> index 912dea5..df124f7 100644
> --- a/net/sunrpc/svc_xprt.c
> +++ b/net/sunrpc/svc_xprt.c
> @@ -160,6 +160,7 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt,
> mutex_init(&xprt->xpt_mutex);
> spin_lock_init(&xprt->xpt_lock);
> set_bit(XPT_BUSY, &xprt->xpt_flags);
> + rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending");
> }
> EXPORT_SYMBOL_GPL(svc_xprt_init);
>
> @@ -810,6 +811,7 @@ int svc_send(struct svc_rqst *rqstp)
> else
> len = xprt->xpt_ops->xpo_sendto(rqstp);
> mutex_unlock(&xprt->xpt_mutex);
> + rpc_wake_up(&xprt->xpt_bc_pending);
> svc_xprt_release(rqstp);
>
> if (len == -ECONNREFUSED || len == -ENOTCONN || len == -EAGAIN)
> diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
> index 76a380d..ccc5e83 100644
> --- a/net/sunrpc/svcsock.c
> +++ b/net/sunrpc/svcsock.c
> @@ -49,6 +49,7 @@
> #include <linux/sunrpc/msg_prot.h>
> #include <linux/sunrpc/svcsock.h>
> #include <linux/sunrpc/stats.h>
> +#include <linux/sunrpc/xprt.h>
>
> #define RPCDBG_FACILITY RPCDBG_SVCXPRT
>
> @@ -153,49 +154,27 @@ static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
> }
>
> /*
> - * Generic sendto routine
> + * send routine intended to be shared by the fore- and back-channel
> */
> -static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
> +int svc_send_common(struct socket *sock, struct xdr_buf *xdr,
> + struct page *headpage, unsigned long headoffset,
> + struct page *tailpage, unsigned long tailoffset)
> {
> - struct svc_sock *svsk =
> - container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
> - struct socket *sock = svsk->sk_sock;
> - int slen;
> - union {
> - struct cmsghdr hdr;
> - long all[SVC_PKTINFO_SPACE / sizeof(long)];
> - } buffer;
> - struct cmsghdr *cmh = &buffer.hdr;
> - int len = 0;
> int result;
> int size;
> struct page **ppage = xdr->pages;
> size_t base = xdr->page_base;
> unsigned int pglen = xdr->page_len;
> unsigned int flags = MSG_MORE;
> - RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
> + int slen;
> + int len = 0;
>
> slen = xdr->len;
>
> - if (rqstp->rq_prot == IPPROTO_UDP) {
> - struct msghdr msg = {
> - .msg_name = &rqstp->rq_addr,
> - .msg_namelen = rqstp->rq_addrlen,
> - .msg_control = cmh,
> - .msg_controllen = sizeof(buffer),
> - .msg_flags = MSG_MORE,
> - };
> -
> - svc_set_cmsg_data(rqstp, cmh);
> -
> - if (sock_sendmsg(sock, &msg, 0) < 0)
> - goto out;
> - }
> -
> /* send head */
> if (slen == xdr->head[0].iov_len)
> flags = 0;
> - len = kernel_sendpage(sock, rqstp->rq_respages[0], 0,
> + len = kernel_sendpage(sock, headpage, headoffset,
> xdr->head[0].iov_len, flags);
> if (len != xdr->head[0].iov_len)
> goto out;
> @@ -219,16 +198,58 @@ static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
> base = 0;
> ppage++;
> }
> +
> /* send tail */
> if (xdr->tail[0].iov_len) {
> - result = kernel_sendpage(sock, rqstp->rq_respages[0],
> - ((unsigned long)xdr->tail[0].iov_base)
> - & (PAGE_SIZE-1),
> - xdr->tail[0].iov_len, 0);
> -
> + result = kernel_sendpage(sock, tailpage, tailoffset,
> + xdr->tail[0].iov_len, 0);
> if (result > 0)
> len += result;
> }
> +
> +out:
> + return len;
> +}
> +
> +
> +/*
> + * Generic sendto routine
> + */
> +static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr)
> +{
> + struct svc_sock *svsk =
> + container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt);
> + struct socket *sock = svsk->sk_sock;
> + union {
> + struct cmsghdr hdr;
> + long all[SVC_PKTINFO_SPACE / sizeof(long)];
> + } buffer;
> + struct cmsghdr *cmh = &buffer.hdr;
> + int len = 0;
> + unsigned long tailoff;
> + unsigned long headoff;
> + RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
> +
> + if (rqstp->rq_prot == IPPROTO_UDP) {
> + struct msghdr msg = {
> + .msg_name = &rqstp->rq_addr,
> + .msg_namelen = rqstp->rq_addrlen,
> + .msg_control = cmh,
> + .msg_controllen = sizeof(buffer),
> + .msg_flags = MSG_MORE,
> + };
> +
> + svc_set_cmsg_data(rqstp, cmh);
> +
> + if (sock_sendmsg(sock, &msg, 0) < 0)
> + goto out;
> + }
> +
> + tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1);
> + headoff = 0;
> + len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff,
> + rqstp->rq_respages[0], tailoff);
> +
> out:
> dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n",
> svsk, xdr->head[0].iov_base, xdr->head[0].iov_len,
> @@ -951,6 +972,57 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
> return -EAGAIN;
> }
>
> +static int svc_process_calldir(struct svc_sock *svsk, struct svc_rqst *rqstp,
> + struct rpc_rqst **reqpp, struct kvec *vec)
> +{
> + struct rpc_rqst *req = NULL;
> + u32 *p;
> + u32 xid;
> + u32 calldir;
> + int len;
> +
> + len = svc_recvfrom(rqstp, vec, 1, 8);
> + if (len < 0)
> + goto error;
> +
> + p = (u32 *)rqstp->rq_arg.head[0].iov_base;
> + xid = *p++;
> + calldir = *p;
> +
> + if (calldir == 0) {
> + /* REQUEST is the most common case */
> + vec[0] = rqstp->rq_arg.head[0];
> + } else {
> + /* REPLY */
> + if (svsk->sk_bc_xprt)
> + req = xprt_lookup_rqst(svsk->sk_bc_xprt, xid);
> +
> + if (!req) {
> + printk(KERN_NOTICE
> + "%s: Got unrecognized reply: "
> + "calldir 0x%x sk_bc_xprt %p xid %08x\n",
> + __func__, ntohl(calldir),
> + svsk->sk_bc_xprt, xid);
> + vec[0] = rqstp->rq_arg.head[0];
> + goto out;
> + }
> +
> + memcpy(&req->rq_private_buf, &req->rq_rcv_buf,
> + sizeof(struct xdr_buf));
> + /* copy the xid and call direction */
> + memcpy(req->rq_private_buf.head[0].iov_base,
> + rqstp->rq_arg.head[0].iov_base, 8);
> + vec[0] = req->rq_private_buf.head[0];
> + }
> + out:
> + vec[0].iov_base += 8;
> + vec[0].iov_len -= 8;
> + len = svsk->sk_reclen - 8;
> + error:
> + *reqpp = req;
> + return len;
> +}
> +
> /*
> * Receive data from a TCP socket.
> */
> @@ -962,6 +1034,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
> int len;
> struct kvec *vec;
> int pnum, vlen;
> + struct rpc_rqst *req = NULL;
>
> dprintk("svc: tcp_recv %p data %d conn %d close %d\n",
> svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags),
> @@ -975,9 +1048,27 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
> vec = rqstp->rq_vec;
> vec[0] = rqstp->rq_arg.head[0];
> vlen = PAGE_SIZE;
> +
> + /*
> + * We have enough data for the whole tcp record. Let's try and read the
> + * first 8 bytes to get the xid and the call direction. We can use this
> + * to figure out if this is a call or a reply to a callback. If
> + * sk_reclen is < 8 (xid and calldir), then this is a malformed packet.
> + * In that case, don't bother with the calldir and just read the data.
> + * It will be rejected in svc_process.
> + */
> + if (len >= 8) {
> + len = svc_process_calldir(svsk, rqstp, &req, vec);
> + if (len < 0)
> + goto err_again;
> + vlen -= 8;
> + }
> +
> pnum = 1;
> while (vlen < len) {
> - vec[pnum].iov_base = page_address(rqstp->rq_pages[pnum]);
> + vec[pnum].iov_base = (req) ?
> + page_address(req->rq_private_buf.pages[pnum - 1]) :
> + page_address(rqstp->rq_pages[pnum]);
> vec[pnum].iov_len = PAGE_SIZE;
> pnum++;
> vlen += PAGE_SIZE;
> @@ -989,6 +1080,16 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
> if (len < 0)
> goto err_again;
>
> + /*
> + * Account for the 8 bytes we read earlier
> + */
> + len += 8;
> +
> + if (req) {
> + xprt_complete_rqst(req->rq_task, len);
> + len = 0;
> + goto out;
> + }
> dprintk("svc: TCP complete record (%d bytes)\n", len);
> rqstp->rq_arg.len = len;
> rqstp->rq_arg.page_base = 0;
> @@ -1002,6 +1103,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
> rqstp->rq_xprt_ctxt = NULL;
> rqstp->rq_prot = IPPROTO_TCP;
>
> +out:
> /* Reset TCP read info */
> svsk->sk_reclen = 0;
> svsk->sk_tcplen = 0;
> diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
> index f412a85..7b0cf70 100644
> --- a/net/sunrpc/xprt.c
> +++ b/net/sunrpc/xprt.c
> @@ -599,6 +599,9 @@ static void xprt_autoclose(struct work_struct *work)
> struct rpc_xprt *xprt =
> container_of(work, struct rpc_xprt, task_cleanup);
>
> + if (xprt_server_backchannel(xprt))
> + return;
Why do you need this? For one thing, it means that XPRT_CLOSE_WAIT never
gets cleared...
> +
> xprt->ops->close(xprt);
> clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
> xprt_release_write(xprt, NULL);
> @@ -669,6 +672,9 @@ xprt_init_autodisconnect(unsigned long data)
> {
> struct rpc_xprt *xprt = (struct rpc_xprt *)data;
>
> + if (xprt_server_backchannel(xprt))
> + return;
Hmm... Do you need this? Why would you want to set up an autodisconnect
timer in the first place?
> +
> spin_lock(&xprt->transport_lock);
> if (!list_empty(&xprt->recv) || xprt->shutdown)
> goto out_abort;
> @@ -1103,6 +1109,13 @@ found:
> dprintk("RPC: created transport %p with %u slots\n", xprt,
> xprt->max_reqs);
>
> + /*
> + * Since we don't want connections for the backchannel, we set
> + * the xprt status to connected
> + */
> + if (args->bc_xprt)
> + xprt_set_connected(xprt);
> +
Why don't you do this in the ->setup() callback?
> return xprt;
> }
>
> diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
> index 62438f3..592681c 100644
> --- a/net/sunrpc/xprtsock.c
> +++ b/net/sunrpc/xprtsock.c
> @@ -32,6 +32,7 @@
> #include <linux/tcp.h>
> #include <linux/sunrpc/clnt.h>
> #include <linux/sunrpc/sched.h>
> +#include <linux/sunrpc/svcsock.h>
> #include <linux/sunrpc/xprtsock.h>
> #include <linux/file.h>
> #ifdef CONFIG_NFS_V4_1
> @@ -43,6 +44,7 @@
> #include <net/udp.h>
> #include <net/tcp.h>
>
> +#include "sunrpc.h"
> /*
> * xprtsock tunables
> */
> @@ -2098,6 +2100,134 @@ static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
> xprt->stat.bklog_u);
> }
>
> +/*
> + * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
> + * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
> + * to use the server side send routines.
> + */
> +void *bc_malloc(struct rpc_task *task, size_t size)
> +{
> + struct page *page;
> + struct rpc_buffer *buf;
> +
> + BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
> + page = alloc_page(GFP_KERNEL);
> +
> + if (!page)
> + return NULL;
> +
> + buf = page_address(page);
> + buf->len = PAGE_SIZE;
> +
> + return buf->data;
> +}
> +
> +/*
> + * Free the space allocated in the bc_alloc routine
> + */
> +void bc_free(void *buffer)
> +{
> + struct rpc_buffer *buf;
> +
> + if (!buffer)
> + return;
> +
> + buf = container_of(buffer, struct rpc_buffer, data);
> + free_page((unsigned long)buf);
> +}
> +
> +/*
> + * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
> + * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
> + */
> +static int bc_sendto(struct rpc_rqst *req)
> +{
> + int len;
> + struct xdr_buf *xbufp = &req->rq_snd_buf;
> + struct rpc_xprt *xprt = req->rq_xprt;
> + struct sock_xprt *transport =
> + container_of(xprt, struct sock_xprt, xprt);
> + struct socket *sock = transport->sock;
> + unsigned long headoff;
> + unsigned long tailoff;
> +
> + /*
> + * Set up the rpc header and record marker stuff
> + */
> + xs_encode_tcp_record_marker(xbufp);
> +
> + tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
> + headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
> + len = svc_send_common(sock, xbufp,
> + virt_to_page(xbufp->head[0].iov_base), headoff,
> + xbufp->tail[0].iov_base, tailoff);
> +
> + if (len != xbufp->len) {
> + printk(KERN_NOTICE "Error sending entire callback!\n");
> + len = -EAGAIN;
> + }
> +
> + return len;
> +}
> +
> +/*
> + * The send routine. Borrows from svc_send
> + */
> +static int bc_send_request(struct rpc_task *task)
> +{
> + struct rpc_rqst *req = task->tk_rqstp;
> + struct svc_xprt *xprt;
> + struct svc_sock *svsk;
> + u32 len;
> +
> + dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
> + /*
> + * Get the server socket associated with this callback xprt
> + */
> + xprt = req->rq_xprt->bc_xprt;
> + svsk = container_of(xprt, struct svc_sock, sk_xprt);
> +
> + /*
> + * Grab the mutex to serialize data as the connection is shared
> + * with the fore channel
> + */
> + if (!mutex_trylock(&xprt->xpt_mutex)) {
> + rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
> + if (!mutex_trylock(&xprt->xpt_mutex))
> + return -EAGAIN;
> + rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
> + }
> + if (test_bit(XPT_DEAD, &xprt->xpt_flags))
> + len = -ENOTCONN;
> + else
> + len = bc_sendto(req);
> + mutex_unlock(&xprt->xpt_mutex);
> +
> + if (len > 0)
> + len = 0;
> +
> + return len;
> +}
> +
> +/*
> + * The close routine. Since this is client initiated, we do nothing
> + */
> +
> +static void bc_close(struct rpc_xprt *xprt)
> +{
> + return;
> +}
> +
> +/*
> + * The xprt destroy routine. Again, because this connection is client
> + * initiated, we do nothing
> + */
> +
> +static void bc_destroy(struct rpc_xprt *xprt)
> +{
> + return;
> +}
> +
> static struct rpc_xprt_ops xs_udp_ops = {
> .set_buffer_size = xs_udp_set_buffer_size,
> .reserve_xprt = xprt_reserve_xprt_cong,
> @@ -2134,6 +2264,22 @@ static struct rpc_xprt_ops xs_tcp_ops = {
> .print_stats = xs_tcp_print_stats,
> };
>
> +/*
> + * The rpc_xprt_ops for the server backchannel
> + */
> +
> +static struct rpc_xprt_ops bc_tcp_ops = {
> + .reserve_xprt = xprt_reserve_xprt,
> + .release_xprt = xprt_release_xprt,
> + .buf_alloc = bc_malloc,
> + .buf_free = bc_free,
> + .send_request = bc_send_request,
> + .set_retrans_timeout = xprt_set_retrans_timeout_def,
> + .close = bc_close,
> + .destroy = bc_destroy,
> + .print_stats = xs_tcp_print_stats,
> +};
> +
> static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
> unsigned int slot_table_size)
> {
> @@ -2272,14 +2418,46 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
> xprt->prot = IPPROTO_TCP;
> xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
> xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
> + xprt->timeout = &xs_tcp_default_timeout;
>
> - xprt->bind_timeout = XS_BIND_TO;
> - xprt->connect_timeout = XS_TCP_CONN_TO;
> - xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
> - xprt->idle_timeout = XS_IDLE_DISC_TO;
> + if (args->bc_xprt) {
> + struct svc_sock *bc_sock;
Why are you embedding this inside the forward channel setup code? Just
make a TCP backchannel class with its own ->setup().
> - xprt->ops = &xs_tcp_ops;
> - xprt->timeout = &xs_tcp_default_timeout;
> + /* backchannel */
> + xprt_set_bound(xprt);
> + xprt->bind_timeout = 0;
> + xprt->connect_timeout = 0;
> + xprt->reestablish_timeout = 0;
> + xprt->idle_timeout = (~0);
> +
> + /*
> + * The backchannel uses the same socket connection as the
> + * forechannel
> + */
> + xprt->bc_xprt = args->bc_xprt;
> + bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
> + bc_sock->sk_bc_xprt = xprt;
> + transport->sock = bc_sock->sk_sock;
> + transport->inet = bc_sock->sk_sk;
> +
> + xprt->ops = &bc_tcp_ops;
> +
> + switch (addr->sa_family) {
> + case AF_INET:
> + xs_format_peer_addresses(xprt, "tcp",
> + RPCBIND_NETID_TCP);
> + break;
> + case AF_INET6:
> + xs_format_peer_addresses(xprt, "tcp",
> + RPCBIND_NETID_TCP6);
> + break;
> + default:
> + kfree(xprt);
> + return ERR_PTR(-EAFNOSUPPORT);
> + }
> +
> + goto out;
> + }
>
> switch (addr->sa_family) {
> case AF_INET:
> @@ -2303,6 +2481,14 @@ static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
> return ERR_PTR(-EAFNOSUPPORT);
> }
>
> + xprt->bind_timeout = XS_BIND_TO;
> + xprt->connect_timeout = XS_TCP_CONN_TO;
> + xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
> + xprt->idle_timeout = XS_IDLE_DISC_TO;
> +
> + xprt->ops = &xs_tcp_ops;
> +
> +out:
> if (xprt_bound(xprt))
> dprintk("RPC: set up xprt to %s (port %s) via %s\n",
> xprt->address_strings[RPC_DISPLAY_ADDR],
--
Trond Myklebust
Linux NFS client maintainer
NetApp
Trond.Myklebust@xxxxxxxxxx
www.netapp.com
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