netdev - [PATCH net-next] liquidio: Prioritize control messages

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Date:   Tue, 27 Mar 2018 19:25:18 -0700
From:   Felix Manlunas <felix.manlunas@...ium.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, raghu.vatsavayi@...ium.com,
        derek.chickles@...ium.com, satananda.burla@...ium.com,
        felix.manlunas@...ium.com, intiyaz.basha@...ium.com
Subject: [PATCH net-next] liquidio: Prioritize control messages

From: Intiyaz Basha <intiyaz.basha@...ium.com>

During heavy tx traffic, control messages (sent by liquidio driver to NIC
firmware) sometimes do not get processed in a timely manner.  Reason is:
the low-level metadata of control messages and that of egress network
packets indicate that they have the same priority.

Fix it by setting a higher priority for control messages through the new
ctrl_qpg field in the oct_txpciq struct.  It is the NIC firmware that does
the actual setting of priority by writing to the new ctrl_qpg field; the
host driver treats that value as opaque and just assigns it to pki_ih3->qpg

Signed-off-by: Intiyaz Basha <intiyaz.basha@...ium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@...ium.com>
---
 drivers/net/ethernet/cavium/liquidio/liquidio_common.h | 8 ++++++--
 drivers/net/ethernet/cavium/liquidio/request_manager.c | 3 ++-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/liquidio_common.h b/drivers/net/ethernet/cavium/liquidio/liquidio_common.h
index 82a783d..75eea83 100644
--- a/drivers/net/ethernet/cavium/liquidio/liquidio_common.h
+++ b/drivers/net/ethernet/cavium/liquidio/liquidio_common.h
@@ -712,9 +712,13 @@ enum lio_phy_type {
 		u64 pkind:6;
 		u64 use_qpg:1;
 		u64 qpg:11;
-		u64 reserved:30;
+		u64 reserved0:10;
+		u64 ctrl_qpg:11;
+		u64 reserved:9;
 #else
-		u64 reserved:30;
+		u64 reserved:9;
+		u64 ctrl_qpg:11;
+		u64 reserved0:10;
 		u64 qpg:11;
 		u64 use_qpg:1;
 		u64 pkind:6;
diff --git a/drivers/net/ethernet/cavium/liquidio/request_manager.c b/drivers/net/ethernet/cavium/liquidio/request_manager.c
index 2766af0..b127035 100644
--- a/drivers/net/ethernet/cavium/liquidio/request_manager.c
+++ b/drivers/net/ethernet/cavium/liquidio/request_manager.c
@@ -628,7 +628,8 @@ static void check_db_timeout(struct work_struct *work)
 		pki_ih3->tag     = LIO_CONTROL;
 		pki_ih3->tagtype = ATOMIC_TAG;
 		pki_ih3->qpg         =
-			oct->instr_queue[sc->iq_no]->txpciq.s.qpg;
+			oct->instr_queue[sc->iq_no]->txpciq.s.ctrl_qpg;
+
 		pki_ih3->pm          = 0x7;
 		pki_ih3->sl          = 8;
 
-- 
1.8.3.1