Commit 80b45261 authored by Simon Derr's avatar Simon Derr Committed by Eric Van Hensbergen
Browse files

9P: Add cancelled() to the transport functions. 



RDMA needs to post a buffer for each incoming reply.
Hence it needs to keep count of these and needs to be
aware of whether a flushed request has received a reply
or not.

This patch adds the cancelled() callback to the transport modules.
It is called when RFLUSH has been received and that the corresponding
request will never receive a reply.

Signed-off-by: default avatarSimon Derr <simon.derr@bull.net>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent 1cff3306

include/net/9p/transport.h

+3 −0
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ 
 * @close: member function to discard a connection on this transport

 * @request: member function to issue a request to the transport

 * @cancel: member function to cancel a request (if it hasn't been sent)

 * @cancelled: member function to notify that a cancelled request will not

 *             not receive a reply

 *

 * This is the basic API for a transport module which is registered by the

 * transport module with the 9P core network module and used by the client
@@ -58,6 +60,7 @@ struct p9_trans_module { 
	void (*close) (struct p9_client *);

	int (*request) (struct p9_client *, struct p9_req_t *req);

	int (*cancel) (struct p9_client *, struct p9_req_t *req);

	int (*cancelled)(struct p9_client *, struct p9_req_t *req);

	int (*zc_request)(struct p9_client *, struct p9_req_t *,

			  char *, char *, int , int, int, int);

};

net/9p/client.c

+9 −3
Original line number Diff line number Diff line
@@ -658,12 +658,18 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 


	/*

	 * if we haven't received a response for oldreq,

	 * remove it from the list.

	 * remove it from the list, and notify the transport

	 * layer that the reply will never arrive.

	 */

	spin_lock(&c->lock);

	if (oldreq->status == REQ_STATUS_FLSH)

	if (oldreq->status == REQ_STATUS_FLSH) {

		list_del(&oldreq->req_list);

		spin_unlock(&c->lock);

		if (c->trans_mod->cancelled)

			c->trans_mod->cancelled(c, req);

	} else {

		spin_unlock(&c->lock);

	}



	p9_free_req(c, req);

	return 0;

net/9p/trans_rdma.c

+11 −0
Original line number Diff line number Diff line
@@ -588,6 +588,17 @@ static int rdma_cancel(struct p9_client *client, struct p9_req_t *req) 
	return 1;

}



/* A request has been fully flushed without a reply.

 * That means we have posted one buffer in excess.

 */

static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req)

{

	struct p9_trans_rdma *rdma = client->trans;



	atomic_inc(&rdma->excess_rc);

	return 0;

}



/**

 * trans_create_rdma - Transport method for creating atransport instance

 * @client: client instance

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