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Commit 80ccdd60 authored by Vipul Pandya's avatar Vipul Pandya Committed by David S. Miller
Browse files

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: default avatarVipul Pandya <vipul@chelsio.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3cbdb928

drivers/infiniband/hw/cxgb4/device.c

+23 −2
Original line number Diff line number Diff line
@@ -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))



	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");

drivers/infiniband/hw/cxgb4/iw_cxgb4.h

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/infiniband/hw/cxgb4/qp.c

+6 −4
Original line number Diff line number Diff line
@@ -1455,6 +1455,7 @@ int c4iw_destroy_qp(struct ib_qp *ib_qp) 
		rhp->db_state = NORMAL;

		idr_for_each(&rhp->qpidr, enable_qp_db, NULL);

	}

	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);
@@ -1574,6 +1575,7 @@ 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 (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);