[PATCH v2] SUNRPC: Fixup v4.1 backchannel request timeouts
From: Benjamin Coddington <hidden>
Date: 2023-12-08 19:19:08
Subsystem:
kernel nfsd, sunrpc, and lockd servers, networking [general], nfs, sunrpc, and lockd clients, the rest · Maintainers:
Chuck Lever, Jeff Layton, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Trond Myklebust, Anna Schumaker, Linus Torvalds
After commit 59464b262ff5 ("SUNRPC: SOFTCONN tasks should time out when on
the sending list"), any 4.1 backchannel tasks placed on the sending queue
would immediately return with -ETIMEDOUT since their req timers are zero.
We can fix this by keeping a copy of the rpc_clnt's timeout params on the
transport and using them to properly setup the timeouts on the v4.1
backchannel tasks' req.
Fixes: 59464b262ff5 ("SUNRPC: SOFTCONN tasks should time out when on the sending list")
Signed-off-by: Benjamin Coddington <redacted>
---
include/linux/sunrpc/xprt.h | 1 +
net/sunrpc/clnt.c | 3 +++
net/sunrpc/xprt.c | 23 ++++++++++++++---------
3 files changed, 18 insertions(+), 9 deletions(-)
diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index f85d3a0daca2..7565902053f3 100644
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h@@ -285,6 +285,7 @@ struct rpc_xprt { * items */ struct list_head bc_pa_list; /* List of preallocated * backchannel rpc_rqst's */ + struct rpc_timeout bc_timeout; /* backchannel timeout params */ #endif /* CONFIG_SUNRPC_BACKCHANNEL */ struct rb_root recv_queue; /* Receive queue */
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index d6805c1268a7..5891757c88b1 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c@@ -279,6 +279,9 @@ static struct rpc_xprt *rpc_clnt_set_transport(struct rpc_clnt *clnt, clnt->cl_autobind = 1; clnt->cl_timeout = timeout; +#if defined(CONFIG_SUNRPC_BACKCHANNEL) + memcpy(&xprt->bc_timeout, timeout, sizeof(struct rpc_timeout)); +#endif rcu_assign_pointer(clnt->cl_xprt, xprt); spin_unlock(&clnt->cl_lock);
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 92301e32cda4..7dce780869fc 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c@@ -653,9 +653,9 @@ static unsigned long xprt_abs_ktime_to_jiffies(ktime_t abstime) jiffies + nsecs_to_jiffies(-delta); } -static unsigned long xprt_calc_majortimeo(struct rpc_rqst *req) +static unsigned long xprt_calc_majortimeo(struct rpc_rqst *req, + const struct rpc_timeout *to) { - const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; unsigned long majortimeo = req->rq_timeout; if (to->to_exponential)
@@ -667,9 +667,10 @@ static unsigned long xprt_calc_majortimeo(struct rpc_rqst *req) return majortimeo; } -static void xprt_reset_majortimeo(struct rpc_rqst *req) +static void xprt_reset_majortimeo(struct rpc_rqst *req, + const struct rpc_timeout *to) { - req->rq_majortimeo += xprt_calc_majortimeo(req); + req->rq_majortimeo += xprt_calc_majortimeo(req, to); } static void xprt_reset_minortimeo(struct rpc_rqst *req)
@@ -677,7 +678,8 @@ static void xprt_reset_minortimeo(struct rpc_rqst *req) req->rq_minortimeo += req->rq_timeout; } -static void xprt_init_majortimeo(struct rpc_task *task, struct rpc_rqst *req) +static void xprt_init_majortimeo(struct rpc_task *task, struct rpc_rqst *req, + const struct rpc_timeout *to) { unsigned long time_init; struct rpc_xprt *xprt = req->rq_xprt;
@@ -686,8 +688,9 @@ static void xprt_init_majortimeo(struct rpc_task *task, struct rpc_rqst *req) time_init = jiffies; else time_init = xprt_abs_ktime_to_jiffies(task->tk_start); - req->rq_timeout = task->tk_client->cl_timeout->to_initval; - req->rq_majortimeo = time_init + xprt_calc_majortimeo(req); + + req->rq_timeout = to->to_initval; + req->rq_majortimeo = time_init + xprt_calc_majortimeo(req, to); req->rq_minortimeo = time_init + req->rq_timeout; }
@@ -715,7 +718,7 @@ int xprt_adjust_timeout(struct rpc_rqst *req) } else { req->rq_timeout = to->to_initval; req->rq_retries = 0; - xprt_reset_majortimeo(req); + xprt_reset_majortimeo(req, to); /* Reset the RTT counters == "slow start" */ spin_lock(&xprt->transport_lock); rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval);
@@ -1888,7 +1891,7 @@ xprt_request_init(struct rpc_task *task) req->rq_snd_buf.bvec = NULL; req->rq_rcv_buf.bvec = NULL; req->rq_release_snd_buf = NULL; - xprt_init_majortimeo(task, req); + xprt_init_majortimeo(task, req, task->tk_client->cl_timeout); trace_xprt_reserve(req); }
@@ -1998,6 +2001,8 @@ xprt_init_bc_request(struct rpc_rqst *req, struct rpc_task *task) */ xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + xbufp->tail[0].iov_len; + + xprt_init_majortimeo(task, req, &req->rq_xprt->bc_timeout); } #endif
--
2.43.0