mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-11 22:56:40 +07:00
2ea24497a1
Since TCP is a stream protocol, our callback read code needs to take into account the fact that RPC callbacks are not always confined to a single TCP segment. This patch adds support for multiple TCP segments by ensuring that we only remove the rpc_rqst structure from the 'free backchannel requests' list once the data has been completely received. We rely on the fact that TCP data is ordered for the duration of the connection. Reported-by: shaobingqing <shaobingqing@bwstor.com.cn> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/******************************************************************************
|
|
|
|
(c) 2008 NetApp. All Rights Reserved.
|
|
|
|
NetApp provides this source code under the GPL v2 License.
|
|
The GPL v2 license is available at
|
|
http://opensource.org/licenses/gpl-license.php.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
******************************************************************************/
|
|
|
|
/*
|
|
* Functions to create and manage the backchannel
|
|
*/
|
|
|
|
#ifndef _LINUX_SUNRPC_BC_XPRT_H
|
|
#define _LINUX_SUNRPC_BC_XPRT_H
|
|
|
|
#include <linux/sunrpc/svcsock.h>
|
|
#include <linux/sunrpc/xprt.h>
|
|
#include <linux/sunrpc/sched.h>
|
|
|
|
#ifdef CONFIG_SUNRPC_BACKCHANNEL
|
|
struct rpc_rqst *xprt_lookup_bc_request(struct rpc_xprt *xprt, __be32 xid);
|
|
void xprt_complete_bc_request(struct rpc_rqst *req, uint32_t copied);
|
|
void xprt_free_bc_request(struct rpc_rqst *req);
|
|
int xprt_setup_backchannel(struct rpc_xprt *, unsigned int min_reqs);
|
|
void xprt_destroy_backchannel(struct rpc_xprt *, unsigned int max_reqs);
|
|
int bc_send(struct rpc_rqst *req);
|
|
|
|
/*
|
|
* Determine if a shared backchannel is in use
|
|
*/
|
|
static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
|
|
{
|
|
if (rqstp->rq_server->sv_bc_xprt)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
#else /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
static inline int xprt_setup_backchannel(struct rpc_xprt *xprt,
|
|
unsigned int min_reqs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int svc_is_backchannel(const struct svc_rqst *rqstp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void xprt_free_bc_request(struct rpc_rqst *req)
|
|
{
|
|
}
|
|
#endif /* CONFIG_SUNRPC_BACKCHANNEL */
|
|
#endif /* _LINUX_SUNRPC_BC_XPRT_H */
|
|
|