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RDMA/cxgb4: Add module_params to enable DB FC & Coalescing on T5 

Both DB Flow-Control and DB Coalescing are disabled by default on T5

Signed-off-by: Vipul Pandya <vipul@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vipul Pandya 2013-03-14 05:09:00 +00:00 committed by David S. Miller
parent 3cbdb928e2
commit 80ccdd6051
3 changed files with 30 additions and 6 deletions
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25
drivers/infiniband/hw/cxgb4/device.c
View File

@ -45,6 +45,16 @@ MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(DRV_VERSION);
static int allow_db_fc_on_t5;
module_param(allow_db_fc_on_t5, int, 0644);
MODULE_PARM_DESC(allow_db_fc_on_t5,
"Allow DB Flow Control on T5 (default = 0)");
static int allow_db_coalescing_on_t5;
module_param(allow_db_coalescing_on_t5, int, 0644);
MODULE_PARM_DESC(allow_db_coalescing_on_t5,
"Allow DB Coalescing on T5 (default = 0)");
struct uld_ctx {
struct list_head entry;
struct cxgb4_lld_info lldi;
@ -630,8 +640,19 @@ static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
if (!ocqp_supported(infop))
pr_info("%s: On-Chip Queues not supported on this device.\n",
pci_name(infop->pdev));
if (!is_t4(infop->adapter_type))
db_fc_threshold = 100000;
if (!is_t4(infop->adapter_type)) {
if (!allow_db_fc_on_t5) {
db_fc_threshold = 100000;
pr_info("DB Flow Control Disabled.\n");
}
if (!allow_db_coalescing_on_t5) {
db_coalescing_threshold = -1;
pr_info("DB Coalescing Disabled.\n");
}
}
devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
if (!devp) {
printk(KERN_ERR MOD "Cannot allocate ib device\n");

1
drivers/infiniband/hw/cxgb4/iw_cxgb4.h
View File

@ -939,6 +939,7 @@ extern struct cxgb4_client t4c_client;
extern c4iw_handler_func c4iw_handlers[NUM_CPL_CMDS];
extern int c4iw_max_read_depth;
extern int db_fc_threshold;
extern int db_coalescing_threshold;
#endif

10
drivers/infiniband/hw/cxgb4/qp.c
View File

@ -1455,8 +1455,9 @@ int c4iw_destroy_qp(struct ib_qp *ib_qp)
rhp->db_state = NORMAL;
idr_for_each(&rhp->qpidr, enable_qp_db, NULL);
}
if (rhp->qpcnt <= db_coalescing_threshold)
cxgb4_enable_db_coalescing(rhp->rdev.lldi.ports[0]);
if (db_coalescing_threshold >= 0)
if (rhp->qpcnt <= db_coalescing_threshold)
cxgb4_enable_db_coalescing(rhp->rdev.lldi.ports[0]);
spin_unlock_irq(&rhp->lock);
atomic_dec(&qhp->refcnt);
wait_event(qhp->wait, !atomic_read(&qhp->refcnt));
@ -1574,8 +1575,9 @@ struct ib_qp *c4iw_create_qp(struct ib_pd *pd, struct ib_qp_init_attr *attrs,
rhp->db_state = FLOW_CONTROL;
idr_for_each(&rhp->qpidr, disable_qp_db, NULL);
}
if (rhp->qpcnt > db_coalescing_threshold)
cxgb4_disable_db_coalescing(rhp->rdev.lldi.ports[0]);
if (db_coalescing_threshold >= 0)
if (rhp->qpcnt > db_coalescing_threshold)
cxgb4_disable_db_coalescing(rhp->rdev.lldi.ports[0]);
ret = insert_handle_nolock(rhp, &rhp->qpidr, qhp, qhp->wq.sq.qid);
spin_unlock_irq(&rhp->lock);
if (ret)