diff options
Diffstat (limited to 'net/sunrpc/xprtrdma/rpc_rdma.c')
| -rw-r--r-- | net/sunrpc/xprtrdma/rpc_rdma.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index b86b5fd62d9f..f1e3639d2050 100644 --- a/net/sunrpc/xprtrdma/rpc_rdma.c +++ b/net/sunrpc/xprtrdma/rpc_rdma.c @@ -916,6 +916,40 @@ out_err: return ret; } +static void __rpcrdma_update_cwnd_locked(struct rpc_xprt *xprt, + struct rpcrdma_buffer *buf, + u32 grant) +{ + buf->rb_credits = grant; + xprt->cwnd = grant << RPC_CWNDSHIFT; +} + +static void rpcrdma_update_cwnd(struct rpcrdma_xprt *r_xprt, u32 grant) +{ + struct rpc_xprt *xprt = &r_xprt->rx_xprt; + + spin_lock(&xprt->transport_lock); + __rpcrdma_update_cwnd_locked(xprt, &r_xprt->rx_buf, grant); + spin_unlock(&xprt->transport_lock); +} + +/** + * rpcrdma_reset_cwnd - Reset the xprt's congestion window + * @r_xprt: controlling transport instance + * + * Prepare @r_xprt for the next connection by reinitializing + * its credit grant to one (see RFC 8166, Section 3.3.3). + */ +void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt) +{ + struct rpc_xprt *xprt = &r_xprt->rx_xprt; + + spin_lock(&xprt->transport_lock); + xprt->cong = 0; + __rpcrdma_update_cwnd_locked(xprt, &r_xprt->rx_buf, 1); + spin_unlock(&xprt->transport_lock); +} + /** * rpcrdma_inline_fixup - Scatter inline received data into rqst's iovecs * @rqst: controlling RPC request @@ -1356,12 +1390,8 @@ void rpcrdma_reply_handler(struct rpcrdma_rep *rep) credits = 1; /* don't deadlock */ else if (credits > buf->rb_max_requests) credits = buf->rb_max_requests; - if (buf->rb_credits != credits) { - spin_lock(&xprt->transport_lock); - buf->rb_credits = credits; - xprt->cwnd = credits << RPC_CWNDSHIFT; - spin_unlock(&xprt->transport_lock); - } + if (buf->rb_credits != credits) + rpcrdma_update_cwnd(r_xprt, credits); req = rpcr_to_rdmar(rqst); if (req->rl_reply) { |