linux-stable/drivers/infiniband/hw/hfi1/sdma_txreq.h
Kaike Wan 34025fb0c4 IB/hfi1: Prioritize the sending of ACK packets
ACK packets are generally associated with request completion and resource
release and therefore should be sent first. This patch optimizes the
send engine by using the following policies:
(1) QPs with RVT_S_ACK_PENDING bit set in qp->s_flags or qpriv->s_flags
should have their priority incremented;
(2) QPs with ACK or TID-ACK packet queued should have their priority
incremented;
(3) When a QP is queued to the wait list due to resource constraints, it
will be queued to the head if it has ACK packet to send;
(4) When selecting qps to run from the wait list, the one with the highest
priority and starve_cnt will be selected; each priority will be equivalent
to a fixed number of starve_cnt (16).

Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
2019-02-05 18:07:44 -05:00

136 lines
4.4 KiB
C

/*
* Copyright(c) 2016 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef HFI1_SDMA_TXREQ_H
#define HFI1_SDMA_TXREQ_H
/* increased for AHG */
#define NUM_DESC 6
/*
* struct sdma_desc - canonical fragment descriptor
*
* This is the descriptor carried in the tx request
* corresponding to each fragment.
*
*/
struct sdma_desc {
/* private: don't use directly */
u64 qw[2];
};
/**
* struct sdma_txreq - the sdma_txreq structure (one per packet)
* @list: for use by user and by queuing for wait
*
* This is the representation of a packet which consists of some
* number of fragments. Storage is provided to within the structure.
* for all fragments.
*
* The storage for the descriptors are automatically extended as needed
* when the currently allocation is exceeded.
*
* The user (Verbs or PSM) may overload this structure with fields
* specific to their use by putting this struct first in their struct.
* The method of allocation of the overloaded structure is user dependent
*
* The list is the only public field in the structure.
*
*/
#define SDMA_TXREQ_S_OK 0
#define SDMA_TXREQ_S_SENDERROR 1
#define SDMA_TXREQ_S_ABORTED 2
#define SDMA_TXREQ_S_SHUTDOWN 3
/* flags bits */
#define SDMA_TXREQ_F_URGENT 0x0001
#define SDMA_TXREQ_F_AHG_COPY 0x0002
#define SDMA_TXREQ_F_USE_AHG 0x0004
#define SDMA_TXREQ_F_VIP 0x0010
struct sdma_txreq;
typedef void (*callback_t)(struct sdma_txreq *, int);
struct iowait;
struct sdma_txreq {
struct list_head list;
/* private: */
struct sdma_desc *descp;
/* private: */
void *coalesce_buf;
/* private: */
struct iowait *wait;
/* private: */
callback_t complete;
#ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
u64 sn;
#endif
/* private: - used in coalesce/pad processing */
u16 packet_len;
/* private: - down-counted to trigger last */
u16 tlen;
/* private: */
u16 num_desc;
/* private: */
u16 desc_limit;
/* private: */
u16 next_descq_idx;
/* private: */
u16 coalesce_idx;
/* private: flags */
u16 flags;
/* private: */
struct sdma_desc descs[NUM_DESC];
};
static inline int sdma_txreq_built(struct sdma_txreq *tx)
{
return tx->num_desc;
}
#endif /* HFI1_SDMA_TXREQ_H */