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1558296251
In order to access HW registers driver needs to acquire a PTT entry
[mapping between bar memory and internal chip address].
Since acquiring PTT entries could fail [at least in theory] as their
number is finite and other flows can hold them, we reserve special PTT
entries for 'important' enough flows - ones we want to guarantee that
would not be susceptible to such issues.
One such special entry is the 'main' PTT which is meant to be used in
flows such as chip initialization and de-initialization.
However, there are other flows that are also using that same entry
for their own purpose, and might run concurrently with the original
flows [notice that for most cases using the main-ptt by mistake, such
a race is still impossible, at least today].
This patch re-organizes the various functions that currently use the
main_ptt in one of two ways:
- If a function shouldn't use the main_ptt it starts acquiring and
releasing it's own PTT entry and use it instead. Notice if those
functions previously couldn't fail, they now can [as acquisition
might fail].
- Change the prototypes so that the main_ptt would be received as
a parameter [instead of explicitly accessing it].
This prevents the future risk of adding codes that introduces new
use-cases for flows using the main_ptt, ones that might be in race
with the actual 'main' flows.
Signed-off-by: Rahul Verma <Rahul.Verma@cavium.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
219 lines
5.3 KiB
C
219 lines
5.3 KiB
C
/* QLogic qed NIC Driver
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* Copyright (c) 2015-2017 QLogic Corporation
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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 _QED_CXT_H
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#define _QED_CXT_H
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/qed/qed_if.h>
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#include "qed_hsi.h"
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#include "qed.h"
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struct qed_cxt_info {
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void *p_cxt;
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u32 iid;
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enum protocol_type type;
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};
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#define MAX_TID_BLOCKS 512
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struct qed_tid_mem {
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u32 tid_size;
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u32 num_tids_per_block;
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u32 waste;
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u8 *blocks[MAX_TID_BLOCKS]; /* 4K */
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};
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/**
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* @brief qed_cxt_acquire - Acquire a new cid of a specific protocol type
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*
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* @param p_hwfn
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* @param type
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* @param p_cid
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*
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* @return int
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*/
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int qed_cxt_acquire_cid(struct qed_hwfn *p_hwfn,
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enum protocol_type type,
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u32 *p_cid);
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/**
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* @brief qedo_cid_get_cxt_info - Returns the context info for a specific cid
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*
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*
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* @param p_hwfn
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* @param p_info in/out
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*
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* @return int
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*/
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int qed_cxt_get_cid_info(struct qed_hwfn *p_hwfn,
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struct qed_cxt_info *p_info);
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/**
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* @brief qed_cxt_get_tid_mem_info
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*
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* @param p_hwfn
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* @param p_info
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*
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* @return int
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*/
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int qed_cxt_get_tid_mem_info(struct qed_hwfn *p_hwfn,
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struct qed_tid_mem *p_info);
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#define QED_CXT_ISCSI_TID_SEG PROTOCOLID_ISCSI
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#define QED_CXT_ROCE_TID_SEG PROTOCOLID_ROCE
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#define QED_CXT_FCOE_TID_SEG PROTOCOLID_FCOE
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enum qed_cxt_elem_type {
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QED_ELEM_CXT,
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QED_ELEM_SRQ,
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QED_ELEM_TASK
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};
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u32 qed_cxt_get_proto_cid_count(struct qed_hwfn *p_hwfn,
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enum protocol_type type, u32 *vf_cid);
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/**
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* @brief qed_cxt_set_pf_params - Set the PF params for cxt init
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*
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* @param p_hwfn
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* @param rdma_tasks - requested maximum
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* @return int
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*/
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int qed_cxt_set_pf_params(struct qed_hwfn *p_hwfn, u32 rdma_tasks);
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/**
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* @brief qed_cxt_cfg_ilt_compute - compute ILT init parameters
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*
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* @param p_hwfn
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* @param last_line
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*
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* @return int
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*/
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int qed_cxt_cfg_ilt_compute(struct qed_hwfn *p_hwfn, u32 *last_line);
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/**
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* @brief qed_cxt_cfg_ilt_compute_excess - how many lines can be decreased
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*
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* @param p_hwfn
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* @param used_lines
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*/
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u32 qed_cxt_cfg_ilt_compute_excess(struct qed_hwfn *p_hwfn, u32 used_lines);
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/**
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* @brief qed_cxt_mngr_alloc - Allocate and init the context manager struct
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*
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* @param p_hwfn
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*
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* @return int
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*/
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int qed_cxt_mngr_alloc(struct qed_hwfn *p_hwfn);
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/**
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* @brief qed_cxt_mngr_free
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*
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* @param p_hwfn
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*/
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void qed_cxt_mngr_free(struct qed_hwfn *p_hwfn);
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/**
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* @brief qed_cxt_tables_alloc - Allocate ILT shadow, Searcher T2, acquired map
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*
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* @param p_hwfn
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*
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* @return int
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*/
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int qed_cxt_tables_alloc(struct qed_hwfn *p_hwfn);
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/**
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* @brief qed_cxt_mngr_setup - Reset the acquired CIDs
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*
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* @param p_hwfn
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*/
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void qed_cxt_mngr_setup(struct qed_hwfn *p_hwfn);
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/**
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* @brief qed_cxt_hw_init_common - Initailze ILT and DQ, common phase, per path.
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*
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*
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*
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* @param p_hwfn
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*/
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void qed_cxt_hw_init_common(struct qed_hwfn *p_hwfn);
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/**
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* @brief qed_cxt_hw_init_pf - Initailze ILT and DQ, PF phase, per path.
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*
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* @param p_hwfn
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* @param p_ptt
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*/
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void qed_cxt_hw_init_pf(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt);
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/**
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* @brief qed_qm_init_pf - Initailze the QM PF phase, per path
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*
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* @param p_hwfn
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* @param p_ptt
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*/
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void qed_qm_init_pf(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt);
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/**
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* @brief Reconfigures QM pf on the fly
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*
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* @param p_hwfn
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* @param p_ptt
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*
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* @return int
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*/
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int qed_qm_reconf(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt);
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/**
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* @brief qed_cxt_release - Release a cid
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*
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* @param p_hwfn
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* @param cid
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*/
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void qed_cxt_release_cid(struct qed_hwfn *p_hwfn,
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u32 cid);
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int qed_cxt_dynamic_ilt_alloc(struct qed_hwfn *p_hwfn,
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enum qed_cxt_elem_type elem_type, u32 iid);
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u32 qed_cxt_get_proto_tid_count(struct qed_hwfn *p_hwfn,
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enum protocol_type type);
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u32 qed_cxt_get_proto_cid_start(struct qed_hwfn *p_hwfn,
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enum protocol_type type);
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int qed_cxt_free_proto_ilt(struct qed_hwfn *p_hwfn, enum protocol_type proto);
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#define QED_CTX_WORKING_MEM 0
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#define QED_CTX_FL_MEM 1
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int qed_cxt_get_task_ctx(struct qed_hwfn *p_hwfn,
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u32 tid, u8 ctx_type, void **task_ctx);
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#endif
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