diff options
| author | Anil Veerabhadrappa <anilgv@broadcom.com> | 2009-12-07 11:40:18 -0800 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-10 09:45:57 -0600 |
| commit | 8776193bc308553ac0011b3bb2dd1837e0c6ab28 (patch) | |
| tree | 4334f5402592860b0c426d765a5647a20648d24d /drivers/scsi/bnx2i/bnx2i_hwi.c | |
| parent | f8c9abe797c54e798b4025b54d71e5d2054c929a (diff) | |
| download | linux-8776193bc308553ac0011b3bb2dd1837e0c6ab28.tar.gz linux-8776193bc308553ac0011b3bb2dd1837e0c6ab28.tar.bz2 linux-8776193bc308553ac0011b3bb2dd1837e0c6ab28.zip | |
[SCSI] bnx2i: update CQ arming algorith for 5771x chipsets
Only affects 5771x (10G chipsets) devices
This is an optimized CQ arming algoritm which takes into account the
number of outstanding tasks
Signed-off-by: Anil Veerabhadrappa <anilgv@broadcom.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/bnx2i/bnx2i_hwi.c')
| -rw-r--r-- | drivers/scsi/bnx2i/bnx2i_hwi.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/drivers/scsi/bnx2i/bnx2i_hwi.c b/drivers/scsi/bnx2i/bnx2i_hwi.c index 5c8d7630c13e..bb69a14a4afc 100644 --- a/drivers/scsi/bnx2i/bnx2i_hwi.c +++ b/drivers/scsi/bnx2i/bnx2i_hwi.c @@ -133,20 +133,38 @@ void bnx2i_arm_cq_event_coalescing(struct bnx2i_endpoint *ep, u8 action) { struct bnx2i_5771x_cq_db *cq_db; u16 cq_index; + u16 next_index; + u32 num_active_cmds; + + /* Coalesce CQ entries only on 10G devices */ if (!test_bit(BNX2I_NX2_DEV_57710, &ep->hba->cnic_dev_type)) return; + /* Do not update CQ DB multiple times before firmware writes + * '0xFFFF' to CQDB->SQN field. Deviation may cause spurious + * interrupts and other unwanted results + */ + cq_db = (struct bnx2i_5771x_cq_db *) ep->qp.cq_pgtbl_virt; + if (cq_db->sqn[0] && cq_db->sqn[0] != 0xFFFF) + return; + if (action == CNIC_ARM_CQE) { - cq_index = ep->qp.cqe_exp_seq_sn + - ep->num_active_cmds / event_coal_div; - cq_index %= (ep->qp.cqe_size * 2 + 1); - if (!cq_index) { + num_active_cmds = ep->num_active_cmds; + if (num_active_cmds <= event_coal_min) + next_index = 1; + else + next_index = event_coal_min + + (num_active_cmds - event_coal_min) / event_coal_div; + if (!next_index) + next_index = 1; + cq_index = ep->qp.cqe_exp_seq_sn + next_index - 1; + if (cq_index > ep->qp.cqe_size * 2) + cq_index -= ep->qp.cqe_size * 2; + if (!cq_index) cq_index = 1; - cq_db = (struct bnx2i_5771x_cq_db *) - ep->qp.cq_pgtbl_virt; - cq_db->sqn[0] = cq_index; - } + + cq_db->sqn[0] = cq_index; } } |