From d521b63b27e3a397e0ef7ca86b6e813861083c83 Mon Sep 17 00:00:00 2001 From: Andy Grover Date: Fri, 30 Oct 2009 08:51:57 +0000 Subject: [PATCH] RDS/IB+IW: Move recv processing to a tasklet Move receive processing from event handler to a tasklet. This should help prevent hangcheck timer from going off when RDS is under heavy load. Signed-off-by: Andy Grover Signed-off-by: David S. Miller --- net/rds/ib.h | 2 ++ net/rds/ib_cm.c | 2 ++ net/rds/ib_recv.c | 28 ++++++++++++++++++++++------ net/rds/iw.h | 2 ++ net/rds/iw_cm.c | 2 ++ net/rds/iw_recv.c | 28 ++++++++++++++++++++++------ 6 files changed, 52 insertions(+), 12 deletions(-) diff --git a/net/rds/ib.h b/net/rds/ib.h index 1378b85..64df4e7 100644 --- a/net/rds/ib.h +++ b/net/rds/ib.h @@ -98,6 +98,7 @@ struct rds_ib_connection { struct rds_ib_send_work *i_sends; /* rx */ + struct tasklet_struct i_recv_tasklet; struct mutex i_recv_mutex; struct rds_ib_work_ring i_recv_ring; struct rds_ib_incoming *i_ibinc; @@ -303,6 +304,7 @@ void rds_ib_inc_free(struct rds_incoming *inc); int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, size_t size); void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context); +void rds_ib_recv_tasklet_fn(unsigned long data); void rds_ib_recv_init_ring(struct rds_ib_connection *ic); void rds_ib_recv_clear_ring(struct rds_ib_connection *ic); void rds_ib_recv_init_ack(struct rds_ib_connection *ic); diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index c2d372f..9d32069 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -694,6 +694,8 @@ int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp) return -ENOMEM; INIT_LIST_HEAD(&ic->ib_node); + tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn, + (unsigned long) ic); mutex_init(&ic->i_recv_mutex); #ifndef KERNEL_HAS_ATOMIC64 spin_lock_init(&ic->i_ack_lock); diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index 2f009d3..fe5ab8c 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -825,17 +825,22 @@ void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context) { struct rds_connection *conn = context; struct rds_ib_connection *ic = conn->c_transport_data; - struct ib_wc wc; - struct rds_ib_ack_state state = { 0, }; - struct rds_ib_recv_work *recv; rdsdebug("conn %p cq %p\n", conn, cq); rds_ib_stats_inc(s_ib_rx_cq_call); - ib_req_notify_cq(cq, IB_CQ_SOLICITED); + tasklet_schedule(&ic->i_recv_tasklet); +} - while (ib_poll_cq(cq, 1, &wc) > 0) { +static inline void rds_poll_cq(struct rds_ib_connection *ic, + struct rds_ib_ack_state *state) +{ + struct rds_connection *conn = ic->conn; + struct ib_wc wc; + struct rds_ib_recv_work *recv; + + while (ib_poll_cq(ic->i_recv_cq, 1, &wc) > 0) { rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", (unsigned long long)wc.wr_id, wc.status, wc.byte_len, be32_to_cpu(wc.ex.imm_data)); @@ -853,7 +858,7 @@ void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context) if (rds_conn_up(conn) || rds_conn_connecting(conn)) { /* We expect errors as the qp is drained during shutdown */ if (wc.status == IB_WC_SUCCESS) { - rds_ib_process_recv(conn, recv, wc.byte_len, &state); + rds_ib_process_recv(conn, recv, wc.byte_len, state); } else { rds_ib_conn_error(conn, "recv completion on " "%pI4 had status %u, disconnecting and " @@ -864,6 +869,17 @@ void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context) rds_ib_ring_free(&ic->i_recv_ring, 1); } +} + +void rds_ib_recv_tasklet_fn(unsigned long data) +{ + struct rds_ib_connection *ic = (struct rds_ib_connection *) data; + struct rds_connection *conn = ic->conn; + struct rds_ib_ack_state state = { 0, }; + + rds_poll_cq(ic, &state); + ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); + rds_poll_cq(ic, &state); if (state.ack_next_valid) rds_ib_set_ack(ic, state.ack_next, state.ack_required); diff --git a/net/rds/iw.h b/net/rds/iw.h index dd72b62..eef2f0c 100644 --- a/net/rds/iw.h +++ b/net/rds/iw.h @@ -119,6 +119,7 @@ struct rds_iw_connection { struct rds_iw_send_work *i_sends; /* rx */ + struct tasklet_struct i_recv_tasklet; struct mutex i_recv_mutex; struct rds_iw_work_ring i_recv_ring; struct rds_iw_incoming *i_iwinc; @@ -330,6 +331,7 @@ void rds_iw_inc_free(struct rds_incoming *inc); int rds_iw_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov, size_t size); void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context); +void rds_iw_recv_tasklet_fn(unsigned long data); void rds_iw_recv_init_ring(struct rds_iw_connection *ic); void rds_iw_recv_clear_ring(struct rds_iw_connection *ic); void rds_iw_recv_init_ack(struct rds_iw_connection *ic); diff --git a/net/rds/iw_cm.c b/net/rds/iw_cm.c index a416b0d..394cf6b 100644 --- a/net/rds/iw_cm.c +++ b/net/rds/iw_cm.c @@ -696,6 +696,8 @@ int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp) return -ENOMEM; INIT_LIST_HEAD(&ic->iw_node); + tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn, + (unsigned long) ic); mutex_init(&ic->i_recv_mutex); #ifndef KERNEL_HAS_ATOMIC64 spin_lock_init(&ic->i_ack_lock); diff --git a/net/rds/iw_recv.c b/net/rds/iw_recv.c index 9f98150..24fc53f 100644 --- a/net/rds/iw_recv.c +++ b/net/rds/iw_recv.c @@ -784,17 +784,22 @@ void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context) { struct rds_connection *conn = context; struct rds_iw_connection *ic = conn->c_transport_data; - struct ib_wc wc; - struct rds_iw_ack_state state = { 0, }; - struct rds_iw_recv_work *recv; rdsdebug("conn %p cq %p\n", conn, cq); rds_iw_stats_inc(s_iw_rx_cq_call); - ib_req_notify_cq(cq, IB_CQ_SOLICITED); + tasklet_schedule(&ic->i_recv_tasklet); +} - while (ib_poll_cq(cq, 1, &wc) > 0) { +static inline void rds_poll_cq(struct rds_iw_connection *ic, + struct rds_iw_ack_state *state) +{ + struct rds_connection *conn = ic->conn; + struct ib_wc wc; + struct rds_iw_recv_work *recv; + + while (ib_poll_cq(ic->i_recv_cq, 1, &wc) > 0) { rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n", (unsigned long long)wc.wr_id, wc.status, wc.byte_len, be32_to_cpu(wc.ex.imm_data)); @@ -812,7 +817,7 @@ void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context) if (rds_conn_up(conn) || rds_conn_connecting(conn)) { /* We expect errors as the qp is drained during shutdown */ if (wc.status == IB_WC_SUCCESS) { - rds_iw_process_recv(conn, recv, wc.byte_len, &state); + rds_iw_process_recv(conn, recv, wc.byte_len, state); } else { rds_iw_conn_error(conn, "recv completion on " "%pI4 had status %u, disconnecting and " @@ -823,6 +828,17 @@ void rds_iw_recv_cq_comp_handler(struct ib_cq *cq, void *context) rds_iw_ring_free(&ic->i_recv_ring, 1); } +} + +void rds_iw_recv_tasklet_fn(unsigned long data) +{ + struct rds_iw_connection *ic = (struct rds_iw_connection *) data; + struct rds_connection *conn = ic->conn; + struct rds_iw_ack_state state = { 0, }; + + rds_poll_cq(ic, &state); + ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); + rds_poll_cq(ic, &state); if (state.ack_next_valid) rds_iw_set_ack(ic, state.ack_next, state.ack_required); -- 1.8.2.3