* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2012, 2016, Intel Corporation.
+ * Copyright (c) 2012, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#include "o2iblnd.h"
+#define CURRENT_LND_VERSION 1
+
static int service = 987;
module_param(service, int, 0444);
MODULE_PARM_DESC(service, "service number (within RDMA_PS_TCP)");
module_param(nscheds, int, 0444);
MODULE_PARM_DESC(nscheds, "number of threads in each scheduler pool");
+static unsigned int conns_per_peer = 1;
+module_param(conns_per_peer, uint, 0444);
+MODULE_PARM_DESC(conns_per_peer, "number of connections per peer");
+
/* NB: this value is shared by all CPTs, it can grow at runtime */
static int ntx = 512;
module_param(ntx, int, 0444);
module_param(peer_buffer_credits, int, 0444);
MODULE_PARM_DESC(peer_buffer_credits, "# per-peer router buffer credits");
-static int peer_timeout = 180;
+static int peer_timeout = DEFAULT_PEER_TIMEOUT;
module_param(peer_timeout, int, 0444);
MODULE_PARM_DESC(peer_timeout, "Seconds without aliveness news to declare peer dead (<=0 to disable)");
module_param(concurrent_sends, int, 0444);
MODULE_PARM_DESC(concurrent_sends, "send work-queue sizing");
-static int map_on_demand;
+static int use_fastreg_gaps;
+module_param(use_fastreg_gaps, int, 0444);
+MODULE_PARM_DESC(use_fastreg_gaps, "Enable discontiguous fastreg fragment support. Expect performance drop");
+
+/*
+ * map_on_demand is a flag used to determine if we can use FMR or FastReg.
+ * This is applicable for kernels which support global memory regions. For
+ * later kernels this flag is always enabled, since we will always either
+ * use FMR or FastReg
+ * For kernels which support global memory regions map_on_demand defaults
+ * to 0 which means we will be using global memory regions exclusively.
+ * If it is set to a value other than 0, then we will behave as follows:
+ * 1. Always default the number of fragments to IBLND_MAX_RDMA_FRAGS
+ * 2. Create FMR/FastReg pools
+ * 3. Negotiate the supported number of fragments per connection
+ * 4. Attempt to transmit using global memory regions only if
+ * map-on-demand is not turned on, otherwise use FMR or FastReg
+ * 5. In case of transmitting tx with GAPS over FMR we will need to
+ * transmit it with multiple fragments. Look at the comments in
+ * kiblnd_fmr_map_tx() for an explanation of the behavior.
+ *
+ * For later kernels we default map_on_demand to 1 and not allow
+ * it to be set to 0, since there is no longer support for global memory
+ * regions. Behavior:
+ * 1. Default the number of fragments to IBLND_MAX_RDMA_FRAGS
+ * 2. Create FMR/FastReg pools
+ * 3. Negotiate the supported number of fragments per connection
+ * 4. Look at the comments in kiblnd_fmr_map_tx() for an explanation of
+ * the behavior when transmit with GAPS verses contiguous.
+ */
+#ifdef HAVE_IB_GET_DMA_MR
+#define IBLND_DEFAULT_MAP_ON_DEMAND 0
+#define MOD_STR "map on demand"
+#else
+#define IBLND_DEFAULT_MAP_ON_DEMAND 1
+#define MOD_STR "map on demand (obsolete)"
+#endif
+static int map_on_demand = IBLND_DEFAULT_MAP_ON_DEMAND;
module_param(map_on_demand, int, 0444);
-MODULE_PARM_DESC(map_on_demand, "map on demand");
+MODULE_PARM_DESC(map_on_demand, MOD_STR);
/* NB: this value is shared by all CPTs, it can grow at runtime */
static int fmr_pool_size = 512;
module_param(use_privileged_port, int, 0644);
MODULE_PARM_DESC(use_privileged_port, "use privileged port when initiating connection");
-kib_tunables_t kiblnd_tunables = {
+static unsigned int wrq_sge = 2;
+module_param(wrq_sge, uint, 0444);
+MODULE_PARM_DESC(wrq_sge, "# scatter/gather element per work request");
+
+struct kib_tunables kiblnd_tunables = {
.kib_dev_failover = &dev_failover,
.kib_service = &service,
.kib_cksum = &cksum,
.kib_timeout = &timeout,
.kib_keepalive = &keepalive,
- .kib_ntx = &ntx,
.kib_default_ipif = &ipif_name,
.kib_retry_count = &retry_count,
.kib_rnr_retry_count = &rnr_retry_count,
.kib_ib_mtu = &ib_mtu,
.kib_require_priv_port = &require_privileged_port,
.kib_use_priv_port = &use_privileged_port,
- .kib_nscheds = &nscheds
+ .kib_nscheds = &nscheds,
+ .kib_wrq_sge = &wrq_sge,
+ .kib_use_fastreg_gaps = &use_fastreg_gaps,
};
static struct lnet_ioctl_config_o2iblnd_tunables default_tunables;
tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
/* Current API version */
- tunables->lnd_version = 0;
+ tunables->lnd_version = CURRENT_LND_VERSION;
if (kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu) < 0) {
CERROR("Invalid ib_mtu %d, expected 256/512/1024/2048/4096\n",
net_tunables->lct_peer_tx_credits =
net_tunables->lct_max_tx_credits;
+#ifndef HAVE_IB_GET_DMA_MR
+ /*
+ * For kernels which do not support global memory regions, always
+ * enable map_on_demand
+ */
+ if (tunables->lnd_map_on_demand == 0)
+ tunables->lnd_map_on_demand = 1;
+#endif
+
if (!tunables->lnd_peercredits_hiw)
tunables->lnd_peercredits_hiw = peer_credits_hiw;
if (tunables->lnd_peercredits_hiw >= net_tunables->lct_peer_tx_credits)
tunables->lnd_peercredits_hiw = net_tunables->lct_peer_tx_credits - 1;
- if (tunables->lnd_map_on_demand < 0 ||
- tunables->lnd_map_on_demand > IBLND_MAX_RDMA_FRAGS) {
- /* disable map-on-demand */
- tunables->lnd_map_on_demand = 0;
- }
-
- if (tunables->lnd_map_on_demand == 1) {
- /* don't make sense to create map if only one fragment */
- tunables->lnd_map_on_demand = 2;
- }
-
- if (tunables->lnd_concurrent_sends == 0) {
- if (tunables->lnd_map_on_demand > 0 &&
- tunables->lnd_map_on_demand <= IBLND_MAX_RDMA_FRAGS / 8) {
- tunables->lnd_concurrent_sends =
- net_tunables->lct_peer_tx_credits * 2;
- } else {
- tunables->lnd_concurrent_sends =
- net_tunables->lct_peer_tx_credits;
- }
- }
+ if (tunables->lnd_concurrent_sends == 0)
+ tunables->lnd_concurrent_sends = net_tunables->lct_peer_tx_credits;
if (tunables->lnd_concurrent_sends > net_tunables->lct_peer_tx_credits * 2)
tunables->lnd_concurrent_sends = net_tunables->lct_peer_tx_credits * 2;
tunables->lnd_fmr_flush_trigger = fmr_flush_trigger;
if (!tunables->lnd_fmr_cache)
tunables->lnd_fmr_cache = fmr_cache;
+ if (!tunables->lnd_ntx)
+ tunables->lnd_ntx = ntx;
+ if (!tunables->lnd_conns_per_peer) {
+ tunables->lnd_conns_per_peer = (conns_per_peer) ?
+ conns_per_peer : 1;
+ }
return 0;
}
int
kiblnd_tunables_init(void)
{
- default_tunables.lnd_version = 0;
- default_tunables.lnd_peercredits_hiw = peer_credits_hiw,
+ default_tunables.lnd_version = CURRENT_LND_VERSION;
+ default_tunables.lnd_peercredits_hiw = peer_credits_hiw;
default_tunables.lnd_map_on_demand = map_on_demand;
default_tunables.lnd_concurrent_sends = concurrent_sends;
default_tunables.lnd_fmr_pool_size = fmr_pool_size;
default_tunables.lnd_fmr_flush_trigger = fmr_flush_trigger;
default_tunables.lnd_fmr_cache = fmr_cache;
+ default_tunables.lnd_ntx = ntx;
+ default_tunables.lnd_conns_per_peer = conns_per_peer;
return 0;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff