/* * libcxgb_ppm.c: Chelsio common library for T3/T4/T5 iSCSI PagePod Manager * * Copyright (c) 2016 Chelsio Communications, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * 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. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * Written by: Karen Xie ([email protected]) */ #define DRV_NAME … #define pr_fmt(fmt) … #include <linux/kernel.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/debugfs.h> #include <linux/export.h> #include <linux/list.h> #include <linux/skbuff.h> #include <linux/pci.h> #include <linux/scatterlist.h> #include "libcxgb_ppm.h" /* Direct Data Placement - * Directly place the iSCSI Data-In or Data-Out PDU's payload into * pre-posted final destination host-memory buffers based on the * Initiator Task Tag (ITT) in Data-In or Target Task Tag (TTT) * in Data-Out PDUs. The host memory address is programmed into * h/w in the format of pagepod entries. The location of the * pagepod entry is encoded into ddp tag which is used as the base * for ITT/TTT. */ /* Direct-Data Placement page size adjustment */ int cxgbi_ppm_find_page_index(struct cxgbi_ppm *ppm, unsigned long pgsz) { … } /* DDP setup & teardown */ static int ppm_find_unused_entries(unsigned long *bmap, unsigned int max_ppods, unsigned int start, unsigned int nr, unsigned int align_mask) { … } static void ppm_mark_entries(struct cxgbi_ppm *ppm, int i, int count, unsigned long caller_data) { … } static int ppm_get_cpu_entries(struct cxgbi_ppm *ppm, unsigned int count, unsigned long caller_data) { … } static int ppm_get_entries(struct cxgbi_ppm *ppm, unsigned int count, unsigned long caller_data) { … } static void ppm_unmark_entries(struct cxgbi_ppm *ppm, int i, int count) { … } void cxgbi_ppm_ppod_release(struct cxgbi_ppm *ppm, u32 idx) { … } EXPORT_SYMBOL(…); int cxgbi_ppm_ppods_reserve(struct cxgbi_ppm *ppm, unsigned short nr_pages, u32 per_tag_pg_idx, u32 *ppod_idx, u32 *ddp_tag, unsigned long caller_data) { … } EXPORT_SYMBOL(…); void cxgbi_ppm_make_ppod_hdr(struct cxgbi_ppm *ppm, u32 tag, unsigned int tid, unsigned int offset, unsigned int length, struct cxgbi_pagepod_hdr *hdr) { … } EXPORT_SYMBOL(…); static void ppm_free(struct cxgbi_ppm *ppm) { … } static void ppm_destroy(struct kref *kref) { … } int cxgbi_ppm_release(struct cxgbi_ppm *ppm) { … } EXPORT_SYMBOL(…); static struct cxgbi_ppm_pool __percpu * ppm_alloc_cpu_pool(unsigned int *total, unsigned int *pcpu_ppmax) { … } int cxgbi_ppm_init(void **ppm_pp, struct net_device *ndev, struct pci_dev *pdev, void *lldev, struct cxgbi_tag_format *tformat, unsigned int iscsi_size, unsigned int llimit, unsigned int start, unsigned int reserve_factor, unsigned int iscsi_edram_start, unsigned int iscsi_edram_size) { … } EXPORT_SYMBOL(…); unsigned int cxgbi_tagmask_set(unsigned int ppmax) { … } EXPORT_SYMBOL(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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