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[linux-2.6] / drivers / infiniband / hw / mthca / mthca_av.c
1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      - Redistributions of source code must retain the above
16  *        copyright notice, this list of conditions and the following
17  *        disclaimer.
18  *
19  *      - Redistributions in binary form must reproduce the above
20  *        copyright notice, this list of conditions and the following
21  *        disclaimer in the documentation and/or other materials
22  *        provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  *
33  * $Id: mthca_av.c 1349 2004-12-16 21:09:43Z roland $
34  */
35
36 #include <linux/init.h>
37
38 #include <rdma/ib_verbs.h>
39 #include <rdma/ib_cache.h>
40
41 #include "mthca_dev.h"
42
43 struct mthca_av {
44         __be32 port_pd;
45         u8     reserved1;
46         u8     g_slid;
47         __be16 dlid;
48         u8     reserved2;
49         u8     gid_index;
50         u8     msg_sr;
51         u8     hop_limit;
52         __be32 sl_tclass_flowlabel;
53         __be32 dgid[4];
54 };
55
56 int mthca_create_ah(struct mthca_dev *dev,
57                     struct mthca_pd *pd,
58                     struct ib_ah_attr *ah_attr,
59                     struct mthca_ah *ah)
60 {
61         u32 index = -1;
62         struct mthca_av *av = NULL;
63
64         ah->type = MTHCA_AH_PCI_POOL;
65
66         if (mthca_is_memfree(dev)) {
67                 ah->av   = kmalloc(sizeof *ah->av, GFP_ATOMIC);
68                 if (!ah->av)
69                         return -ENOMEM;
70
71                 ah->type = MTHCA_AH_KMALLOC;
72                 av       = ah->av;
73         } else if (!atomic_read(&pd->sqp_count) &&
74                  !(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
75                 index = mthca_alloc(&dev->av_table.alloc);
76
77                 /* fall back to allocate in host memory */
78                 if (index == -1)
79                         goto on_hca_fail;
80
81                 av = kmalloc(sizeof *av, GFP_ATOMIC);
82                 if (!av)
83                         goto on_hca_fail;
84
85                 ah->type = MTHCA_AH_ON_HCA;
86                 ah->avdma  = dev->av_table.ddr_av_base +
87                         index * MTHCA_AV_SIZE;
88         }
89
90 on_hca_fail:
91         if (ah->type == MTHCA_AH_PCI_POOL) {
92                 ah->av = pci_pool_alloc(dev->av_table.pool,
93                                         SLAB_ATOMIC, &ah->avdma);
94                 if (!ah->av)
95                         return -ENOMEM;
96
97                 av = ah->av;
98         }
99
100         ah->key = pd->ntmr.ibmr.lkey;
101
102         memset(av, 0, MTHCA_AV_SIZE);
103
104         av->port_pd = cpu_to_be32(pd->pd_num | (ah_attr->port_num << 24));
105         av->g_slid  = ah_attr->src_path_bits;
106         av->dlid    = cpu_to_be16(ah_attr->dlid);
107         av->msg_sr  = (3 << 4) | /* 2K message */
108                 ah_attr->static_rate;
109         av->sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
110         if (ah_attr->ah_flags & IB_AH_GRH) {
111                 av->g_slid |= 0x80;
112                 av->gid_index = (ah_attr->port_num - 1) * dev->limits.gid_table_len +
113                         ah_attr->grh.sgid_index;
114                 av->hop_limit = ah_attr->grh.hop_limit;
115                 av->sl_tclass_flowlabel |=
116                         cpu_to_be32((ah_attr->grh.traffic_class << 20) |
117                                     ah_attr->grh.flow_label);
118                 memcpy(av->dgid, ah_attr->grh.dgid.raw, 16);
119         } else {
120                 /* Arbel workaround -- low byte of GID must be 2 */
121                 av->dgid[3] = cpu_to_be32(2);
122         }
123
124         if (0) {
125                 int j;
126
127                 mthca_dbg(dev, "Created UDAV at %p/%08lx:\n",
128                           av, (unsigned long) ah->avdma);
129                 for (j = 0; j < 8; ++j)
130                         printk(KERN_DEBUG "  [%2x] %08x\n",
131                                j * 4, be32_to_cpu(((__be32 *) av)[j]));
132         }
133
134         if (ah->type == MTHCA_AH_ON_HCA) {
135                 memcpy_toio(dev->av_table.av_map + index * MTHCA_AV_SIZE,
136                             av, MTHCA_AV_SIZE);
137                 kfree(av);
138         }
139
140         return 0;
141 }
142
143 int mthca_destroy_ah(struct mthca_dev *dev, struct mthca_ah *ah)
144 {
145         switch (ah->type) {
146         case MTHCA_AH_ON_HCA:
147                 mthca_free(&dev->av_table.alloc,
148                            (ah->avdma - dev->av_table.ddr_av_base) /
149                            MTHCA_AV_SIZE);
150                 break;
151
152         case MTHCA_AH_PCI_POOL:
153                 pci_pool_free(dev->av_table.pool, ah->av, ah->avdma);
154                 break;
155
156         case MTHCA_AH_KMALLOC:
157                 kfree(ah->av);
158                 break;
159         }
160
161         return 0;
162 }
163
164 int mthca_read_ah(struct mthca_dev *dev, struct mthca_ah *ah,
165                   struct ib_ud_header *header)
166 {
167         if (ah->type == MTHCA_AH_ON_HCA)
168                 return -EINVAL;
169
170         header->lrh.service_level   = be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 28;
171         header->lrh.destination_lid = ah->av->dlid;
172         header->lrh.source_lid      = cpu_to_be16(ah->av->g_slid & 0x7f);
173         if (ah->av->g_slid & 0x80) {
174                 header->grh_present = 1;
175                 header->grh.traffic_class =
176                         (be32_to_cpu(ah->av->sl_tclass_flowlabel) >> 20) & 0xff;
177                 header->grh.flow_label    =
178                         ah->av->sl_tclass_flowlabel & cpu_to_be32(0xfffff);
179                 ib_get_cached_gid(&dev->ib_dev,
180                                   be32_to_cpu(ah->av->port_pd) >> 24,
181                                   ah->av->gid_index,
182                                   &header->grh.source_gid);
183                 memcpy(header->grh.destination_gid.raw,
184                        ah->av->dgid, 16);
185         } else {
186                 header->grh_present = 0;
187         }
188
189         return 0;
190 }
191
192 int __devinit mthca_init_av_table(struct mthca_dev *dev)
193 {
194         int err;
195
196         if (mthca_is_memfree(dev))
197                 return 0;
198
199         err = mthca_alloc_init(&dev->av_table.alloc,
200                                dev->av_table.num_ddr_avs,
201                                dev->av_table.num_ddr_avs - 1,
202                                0);
203         if (err)
204                 return err;
205
206         dev->av_table.pool = pci_pool_create("mthca_av", dev->pdev,
207                                              MTHCA_AV_SIZE,
208                                              MTHCA_AV_SIZE, 0);
209         if (!dev->av_table.pool)
210                 goto out_free_alloc;
211
212         if (!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
213                 dev->av_table.av_map = ioremap(pci_resource_start(dev->pdev, 4) +
214                                                dev->av_table.ddr_av_base -
215                                                dev->ddr_start,
216                                                dev->av_table.num_ddr_avs *
217                                                MTHCA_AV_SIZE);
218                 if (!dev->av_table.av_map)
219                         goto out_free_pool;
220         } else
221                 dev->av_table.av_map = NULL;
222
223         return 0;
224
225  out_free_pool:
226         pci_pool_destroy(dev->av_table.pool);
227
228  out_free_alloc:
229         mthca_alloc_cleanup(&dev->av_table.alloc);
230         return -ENOMEM;
231 }
232
233 void __devexit mthca_cleanup_av_table(struct mthca_dev *dev)
234 {
235         if (mthca_is_memfree(dev))
236                 return;
237
238         if (dev->av_table.av_map)
239                 iounmap(dev->av_table.av_map);
240         pci_pool_destroy(dev->av_table.pool);
241         mthca_alloc_cleanup(&dev->av_table.alloc);
242 }