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Commit 697fefc7 authored by Intiyaz Basha's avatar Intiyaz Basha Committed by David S. Miller
Browse files

liquidio: Prioritize control messages 



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: default avatarIntiyaz Basha <intiyaz.basha@cavium.com>
Signed-off-by: default avatarFelix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b349e0b5

drivers/net/ethernet/cavium/liquidio/liquidio_common.h

+6 −2
Original line number Diff line number Diff line
@@ -712,9 +712,13 @@ union oct_txpciq { 
		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;

drivers/net/ethernet/cavium/liquidio/request_manager.c

+2 −1
Original line number Diff line number Diff line
@@ -628,7 +628,8 @@ octeon_prepare_soft_command(struct octeon_device *oct, 
		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;