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RDS/IB+IW: Move recv processing to a tasklet

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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 <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andy Grover
2009-10-30 08:51:57 +00:00
committed by David S. Miller
parent 0514f8a9c0
commit d521b63b27
6 changed files with 52 additions and 12 deletions
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28
net/rds/iw_recv.c
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@@ -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);