From 56012459310a1dbcc55c2dbf5500a9f7571402cb Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar Date: Tue, 8 Mar 2016 09:19:01 -0800 Subject: [PATCH] RDS: IB: split the mr registration and invalidation path MR invalidation in RDS is done in background thread and not in data path like registration. So break the dependency between them which helps to remove the performance bottleneck. Signed-off-by: Santosh Shilimkar --- net/rds/ib.h | 4 +++- net/rds/ib_cm.c | 9 +++++++-- net/rds/ib_frmr.c | 11 ++++++----- 3 files changed, 16 insertions(+), 8 deletions(-) diff --git a/net/rds/ib.h b/net/rds/ib.h index f4e81214e70a..f14c26d22b27 100644 --- a/net/rds/ib.h +++ b/net/rds/ib.h @@ -14,7 +14,8 @@ #define RDS_IB_DEFAULT_RECV_WR 1024 #define RDS_IB_DEFAULT_SEND_WR 256 -#define RDS_IB_DEFAULT_FR_WR 512 +#define RDS_IB_DEFAULT_FR_WR 256 +#define RDS_IB_DEFAULT_FR_INV_WR 256 #define RDS_IB_DEFAULT_RETRY_COUNT 1 @@ -125,6 +126,7 @@ struct rds_ib_connection { /* To control the number of wrs from fastreg */ atomic_t i_fastreg_wrs; + atomic_t i_fastunreg_wrs; /* interrupt handling */ struct tasklet_struct i_send_tasklet; diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c index b9da1e59ecc1..3002acf75766 100644 --- a/net/rds/ib_cm.c +++ b/net/rds/ib_cm.c @@ -382,7 +382,10 @@ static int rds_ib_setup_qp(struct rds_connection *conn) * completion queue and send queue. This extra space is used for FRMR * registration and invalidation work requests */ - fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0); + fr_queue_space = rds_ibdev->use_fastreg ? + (RDS_IB_DEFAULT_FR_WR + 1) + + (RDS_IB_DEFAULT_FR_INV_WR + 1) + : 0; /* add the conn now so that connection establishment has the dev */ rds_ib_add_conn(rds_ibdev, conn); @@ -444,6 +447,7 @@ static int rds_ib_setup_qp(struct rds_connection *conn) attr.send_cq = ic->i_send_cq; attr.recv_cq = ic->i_recv_cq; atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR); + atomic_set(&ic->i_fastunreg_wrs, RDS_IB_DEFAULT_FR_INV_WR); /* * XXX this can fail if max_*_wr is too large? Are we supposed @@ -766,7 +770,8 @@ void rds_ib_conn_path_shutdown(struct rds_conn_path *cp) wait_event(rds_ib_ring_empty_wait, rds_ib_ring_empty(&ic->i_recv_ring) && (atomic_read(&ic->i_signaled_sends) == 0) && - (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR)); + (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR) && + (atomic_read(&ic->i_fastunreg_wrs) == RDS_IB_DEFAULT_FR_INV_WR)); tasklet_kill(&ic->i_send_tasklet); tasklet_kill(&ic->i_recv_tasklet); diff --git a/net/rds/ib_frmr.c b/net/rds/ib_frmr.c index 66b3d6228a15..48332a6ed738 100644 --- a/net/rds/ib_frmr.c +++ b/net/rds/ib_frmr.c @@ -241,8 +241,8 @@ static int rds_ib_post_inv(struct rds_ib_mr *ibmr) if (frmr->fr_state != FRMR_IS_INUSE) goto out; - while (atomic_dec_return(&ibmr->ic->i_fastreg_wrs) <= 0) { - atomic_inc(&ibmr->ic->i_fastreg_wrs); + while (atomic_dec_return(&ibmr->ic->i_fastunreg_wrs) <= 0) { + atomic_inc(&ibmr->ic->i_fastunreg_wrs); cpu_relax(); } @@ -261,7 +261,7 @@ static int rds_ib_post_inv(struct rds_ib_mr *ibmr) if (unlikely(ret)) { frmr->fr_state = FRMR_IS_STALE; frmr->fr_inv = false; - atomic_inc(&ibmr->ic->i_fastreg_wrs); + atomic_inc(&ibmr->ic->i_fastunreg_wrs); pr_err("RDS/IB: %s returned error(%d)\n", __func__, ret); goto out; } @@ -289,9 +289,10 @@ void rds_ib_mr_cqe_handler(struct rds_ib_connection *ic, struct ib_wc *wc) if (frmr->fr_inv) { frmr->fr_state = FRMR_IS_FREE; frmr->fr_inv = false; + atomic_inc(&ic->i_fastreg_wrs); + } else { + atomic_inc(&ic->i_fastunreg_wrs); } - - atomic_inc(&ic->i_fastreg_wrs); } void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed, -- 2.30.2