1 /*
2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  *
32  */
33 
34 #ifndef USNIC_FWD_H_
35 #define USNIC_FWD_H_
36 
37 #include <linux/if.h>
38 #include <linux/netdevice.h>
39 #include <linux/if_ether.h>
40 #include <linux/pci.h>
41 #include <linux/in.h>
42 
43 #include "usnic_abi.h"
44 #include "usnic_common_pkt_hdr.h"
45 #include "vnic_devcmd.h"
46 
47 struct usnic_fwd_dev {
48 	struct pci_dev			*pdev;
49 	struct net_device		*netdev;
50 	spinlock_t			lock;
51 	/*
52 	 * The following fields can be read directly off the device.
53 	 * However, they should be set by a accessor function, except name,
54 	 * which cannot be changed.
55 	 */
56 	bool				link_up;
57 	char				mac[ETH_ALEN];
58 	unsigned int			mtu;
59 	__be32				inaddr;
60 	char				name[IFNAMSIZ];
61 };
62 
63 struct usnic_fwd_flow {
64 	uint32_t			flow_id;
65 	struct usnic_fwd_dev		*ufdev;
66 	unsigned int			vnic_idx;
67 };
68 
69 struct usnic_filter_action {
70 	int				vnic_idx;
71 	struct filter_action		action;
72 };
73 
74 struct usnic_fwd_dev *usnic_fwd_dev_alloc(struct pci_dev *pdev);
75 void usnic_fwd_dev_free(struct usnic_fwd_dev *ufdev);
76 
77 void usnic_fwd_set_mac(struct usnic_fwd_dev *ufdev, const char mac[ETH_ALEN]);
78 void usnic_fwd_add_ipaddr(struct usnic_fwd_dev *ufdev, __be32 inaddr);
79 void usnic_fwd_del_ipaddr(struct usnic_fwd_dev *ufdev);
80 void usnic_fwd_carrier_up(struct usnic_fwd_dev *ufdev);
81 void usnic_fwd_carrier_down(struct usnic_fwd_dev *ufdev);
82 void usnic_fwd_set_mtu(struct usnic_fwd_dev *ufdev, unsigned int mtu);
83 
84 /*
85  * Allocate a flow on this forwarding device. Whoever calls this function,
86  * must monitor netdev events on ufdev's netdevice. If NETDEV_REBOOT or
87  * NETDEV_DOWN is seen, flow will no longer function and must be
88  * immediately freed by calling usnic_dealloc_flow.
89  */
90 struct usnic_fwd_flow*
91 usnic_fwd_alloc_flow(struct usnic_fwd_dev *ufdev, struct filter *filter,
92 				struct usnic_filter_action *action);
93 int usnic_fwd_dealloc_flow(struct usnic_fwd_flow *flow);
94 int usnic_fwd_enable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx);
95 int usnic_fwd_disable_qp(struct usnic_fwd_dev *ufdev, int vnic_idx, int qp_idx);
96 
97 static inline void usnic_fwd_init_usnic_filter(struct filter *filter,
98 						uint32_t usnic_id)
99 {
100 	filter->type = FILTER_USNIC_ID;
101 	filter->u.usnic.ethtype = ETH_P_IBOE;
102 	filter->u.usnic.flags = FILTER_FIELD_USNIC_ETHTYPE |
103 				FILTER_FIELD_USNIC_ID |
104 				FILTER_FIELD_USNIC_PROTO;
105 	filter->u.usnic.proto_version = (USNIC_ROCE_GRH_VER <<
106 					 USNIC_ROCE_GRH_VER_SHIFT) |
107 					 USNIC_PROTO_VER;
108 	filter->u.usnic.usnic_id = usnic_id;
109 }
110 
111 static inline void usnic_fwd_init_udp_filter(struct filter *filter,
112 						uint32_t daddr, uint16_t dport)
113 {
114 	filter->type = FILTER_IPV4_5TUPLE;
115 	filter->u.ipv4.flags = FILTER_FIELD_5TUP_PROTO;
116 	filter->u.ipv4.protocol = PROTO_UDP;
117 
118 	if (daddr) {
119 		filter->u.ipv4.flags |= FILTER_FIELD_5TUP_DST_AD;
120 		filter->u.ipv4.dst_addr = daddr;
121 	}
122 
123 	if (dport) {
124 		filter->u.ipv4.flags |= FILTER_FIELD_5TUP_DST_PT;
125 		filter->u.ipv4.dst_port = dport;
126 	}
127 }
128 
129 #endif /* !USNIC_FWD_H_ */
130