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3a336cb171
cxgb_busy_poll, corresponding to ndo_busy_poll, gets called by the socket waiting for data. With busy_poll enabled, improvement is seen in latency numbers as observed by collecting netperf TCP_RR numbers. Below are latency number, with and without busy-poll, in a switched environment for a particular msg size: netperf command: netperf -4 -H <ip> -l 30 -t TCP_RR -- -r1,1 Latency without busy-poll: ~16.25 us Latency with busy-poll : ~08.79 us Based on original work by Kumar Sanghvi <kumaras@chelsio.com> Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
120 lines
4.6 KiB
C
120 lines
4.6 KiB
C
/*
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* This file is part of the Chelsio T4 Ethernet driver for Linux.
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*
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* Copyright (c) 2003-2014 Chelsio Communications, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef __T4_VALUES_H__
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#define __T4_VALUES_H__
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/* This file contains definitions for various T4 register value hardware
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* constants. The types of values encoded here are predominantly those for
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* register fields which control "modal" behavior. For the most part, we do
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* not include definitions for register fields which are simple numeric
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* metrics, etc.
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*/
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/* SGE register field values.
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*/
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/* CONTROL1 register */
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#define RXPKTCPLMODE_SPLIT_X 1
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#define INGPCIEBOUNDARY_SHIFT_X 5
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#define INGPCIEBOUNDARY_32B_X 0
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#define INGPADBOUNDARY_SHIFT_X 5
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/* CONTROL2 register */
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#define INGPACKBOUNDARY_SHIFT_X 5
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#define INGPACKBOUNDARY_16B_X 0
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/* GTS register */
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#define SGE_TIMERREGS 6
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#define TIMERREG_COUNTER0_X 0
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/* T5 and later support a new BAR2-based doorbell mechanism for Egress Queues.
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* The User Doorbells are each 128 bytes in length with a Simple Doorbell at
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* offsets 8x and a Write Combining single 64-byte Egress Queue Unit
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* (IDXSIZE_UNIT_X) Gather Buffer interface at offset 64. For Ingress Queues,
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* we have a Going To Sleep register at offsets 8x+4.
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*
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* As noted above, we have many instances of the Simple Doorbell and Going To
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* Sleep registers at offsets 8x and 8x+4, respectively. We want to use a
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* non-64-byte aligned offset for the Simple Doorbell in order to attempt to
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* avoid buffering of the writes to the Simple Doorbell and we want to use a
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* non-contiguous offset for the Going To Sleep writes in order to avoid
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* possible combining between them.
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*/
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#define SGE_UDB_SIZE 128
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#define SGE_UDB_KDOORBELL 8
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#define SGE_UDB_GTS 20
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#define SGE_UDB_WCDOORBELL 64
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/* PCI-E definitions */
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#define WINDOW_SHIFT_X 10
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#define PCIEOFST_SHIFT_X 10
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/* TP_VLAN_PRI_MAP controls which subset of fields will be present in the
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* Compressed Filter Tuple for LE filters. Each bit set in TP_VLAN_PRI_MAP
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* selects for a particular field being present. These fields, when present
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* in the Compressed Filter Tuple, have the following widths in bits.
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*/
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#define FT_FCOE_W 1
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#define FT_PORT_W 3
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#define FT_VNIC_ID_W 17
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#define FT_VLAN_W 17
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#define FT_TOS_W 8
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#define FT_PROTOCOL_W 8
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#define FT_ETHERTYPE_W 16
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#define FT_MACMATCH_W 9
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#define FT_MPSHITTYPE_W 3
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#define FT_FRAGMENTATION_W 1
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/* Some of the Compressed Filter Tuple fields have internal structure. These
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* bit shifts/masks describe those structures. All shifts are relative to the
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* base position of the fields within the Compressed Filter Tuple
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*/
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#define FT_VLAN_VLD_S 16
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#define FT_VLAN_VLD_V(x) ((x) << FT_VLAN_VLD_S)
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#define FT_VLAN_VLD_F FT_VLAN_VLD_V(1U)
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#define FT_VNID_ID_VF_S 0
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#define FT_VNID_ID_VF_V(x) ((x) << FT_VNID_ID_VF_S)
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#define FT_VNID_ID_PF_S 7
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#define FT_VNID_ID_PF_V(x) ((x) << FT_VNID_ID_PF_S)
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#define FT_VNID_ID_VLD_S 16
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#define FT_VNID_ID_VLD_V(x) ((x) << FT_VNID_ID_VLD_S)
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#endif /* __T4_VALUES_H__ */
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