126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/*
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* Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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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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*/
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#include <linux/bitmap.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "usnic_transport.h"
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#include "usnic_log.h"
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/* ROCE */
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static unsigned long *roce_bitmap;
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static u16 roce_next_port = 1;
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#define ROCE_BITMAP_SZ ((1 << (8 /*CHAR_BIT*/ * sizeof(u16)))/8 /*CHAR BIT*/)
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static DEFINE_SPINLOCK(roce_bitmap_lock);
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static const char *transport_to_str(enum usnic_transport_type type)
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{
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switch (type) {
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case USNIC_TRANSPORT_UNKNOWN:
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return "Unknown";
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case USNIC_TRANSPORT_ROCE_CUSTOM:
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return "roce custom";
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case USNIC_TRANSPORT_MAX:
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return "Max?";
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default:
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return "Not known";
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}
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}
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/*
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* reserve a port number. if "0" specified, we will try to pick one
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* starting at roce_next_port. roce_next_port will take on the values
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* 1..4096
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*/
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u16 usnic_transport_rsrv_port(enum usnic_transport_type type, u16 port_num)
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{
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if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
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spin_lock(&roce_bitmap_lock);
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if (!port_num) {
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port_num = bitmap_find_next_zero_area(roce_bitmap,
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ROCE_BITMAP_SZ,
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roce_next_port /* start */,
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1 /* nr */,
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0 /* align */);
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roce_next_port = (port_num & 4095) + 1;
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} else if (test_bit(port_num, roce_bitmap)) {
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usnic_err("Failed to allocate port for %s\n",
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transport_to_str(type));
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spin_unlock(&roce_bitmap_lock);
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goto out_fail;
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}
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bitmap_set(roce_bitmap, port_num, 1);
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spin_unlock(&roce_bitmap_lock);
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} else {
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usnic_err("Failed to allocate port - transport %s unsupported\n",
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transport_to_str(type));
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goto out_fail;
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}
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usnic_dbg("Allocating port %hu for %s\n", port_num,
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transport_to_str(type));
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return port_num;
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out_fail:
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return 0;
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}
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void usnic_transport_unrsrv_port(enum usnic_transport_type type, u16 port_num)
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{
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if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
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spin_lock(&roce_bitmap_lock);
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if (!port_num) {
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usnic_err("Unreserved unvalid port num 0 for %s\n",
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transport_to_str(type));
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goto out_roce_custom;
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}
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if (!test_bit(port_num, roce_bitmap)) {
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usnic_err("Unreserving invalid %hu for %s\n",
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port_num,
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transport_to_str(type));
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goto out_roce_custom;
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}
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bitmap_clear(roce_bitmap, port_num, 1);
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usnic_dbg("Freeing port %hu for %s\n", port_num,
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transport_to_str(type));
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out_roce_custom:
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spin_unlock(&roce_bitmap_lock);
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} else {
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usnic_err("Freeing invalid port %hu for %d\n", port_num, type);
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}
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}
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int usnic_transport_init(void)
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{
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roce_bitmap = kzalloc(ROCE_BITMAP_SZ, GFP_KERNEL);
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if (!roce_bitmap) {
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usnic_err("Failed to allocate bit map");
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return -ENOMEM;
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}
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/* Do not ever allocate bit 0, hence set it here */
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bitmap_set(roce_bitmap, 0, 1);
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return 0;
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}
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void usnic_transport_fini(void)
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{
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kfree(roce_bitmap);
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}
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