source: bootcd/isolinux/syslinux-6.03/gpxe/src/net/infiniband/ib_packet.c

Last change on this file was e16e8f2, checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago

bootstuff
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File size: 7.0 KB
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1/*
2 * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19FILE_LICENCE ( GPL2_OR_LATER );
20
21#include <stdint.h>
22#include <stdlib.h>
23#include <string.h>
24#include <errno.h>
25#include <byteswap.h>
26#include <gpxe/iobuf.h>
27#include <gpxe/infiniband.h>
28#include <gpxe/ib_packet.h>
29
30/**
31 * @file
32 *
33 * Infiniband Packet Formats
34 *
35 */
36
37/**
38 * Add IB headers
39 *
40 * @v ibdev             Infiniband device
41 * @v iobuf             I/O buffer to contain headers
42 * @v qp                Queue pair
43 * @v payload_len       Payload length
44 * @v av                Address vector
45 */
46int ib_push ( struct ib_device *ibdev, struct io_buffer *iobuf,
47              struct ib_queue_pair *qp, size_t payload_len,
48              const struct ib_address_vector *av ) {
49        struct ib_local_route_header *lrh;
50        struct ib_global_route_header *grh;
51        struct ib_base_transport_header *bth;
52        struct ib_datagram_extended_transport_header *deth;
53        size_t orig_iob_len = iob_len ( iobuf );
54        size_t pad_len;
55        size_t lrh_len;
56        size_t grh_len;
57        unsigned int vl;
58        unsigned int lnh;
59
60        DBGC2 ( ibdev, "IBDEV %p TX %04x:%08lx => %04x:%08lx (key %08lx)\n",
61                ibdev, ibdev->lid, qp->ext_qpn, av->lid, av->qpn, av->qkey );
62
63        /* Calculate packet length */
64        pad_len = ( (-payload_len) & 0x3 );
65        payload_len += pad_len;
66        payload_len += 4; /* ICRC */
67
68        /* Reserve space for headers */
69        orig_iob_len = iob_len ( iobuf );
70        deth = iob_push ( iobuf, sizeof ( *deth ) );
71        bth = iob_push ( iobuf, sizeof ( *bth ) );
72        grh_len = ( payload_len + iob_len ( iobuf ) - orig_iob_len );
73        grh = ( av->gid_present ?
74                iob_push ( iobuf, sizeof ( *grh ) ) : NULL );
75        lrh = iob_push ( iobuf, sizeof ( *lrh ) );
76        lrh_len = ( payload_len + iob_len ( iobuf ) - orig_iob_len );
77
78        /* Construct LRH */
79        vl = ( ( qp->ext_qpn == IB_QPN_SMI ) ? IB_VL_SMP : IB_VL_DEFAULT );
80        lrh->vl__lver = ( vl << 4 );
81        lnh = ( grh ? IB_LNH_GRH : IB_LNH_BTH );
82        lrh->sl__lnh = ( ( av->sl << 4 ) | lnh );
83        lrh->dlid = htons ( av->lid );
84        lrh->length = htons ( lrh_len >> 2 );
85        lrh->slid = htons ( ibdev->lid );
86
87        /* Construct GRH, if required */
88        if ( grh ) {
89                grh->ipver__tclass__flowlabel =
90                        htonl ( IB_GRH_IPVER_IPv6 << 28 );
91                grh->paylen = htons ( grh_len );
92                grh->nxthdr = IB_GRH_NXTHDR_IBA;
93                grh->hoplmt = 0;
94                memcpy ( &grh->sgid, &ibdev->gid, sizeof ( grh->sgid ) );
95                memcpy ( &grh->dgid, &av->gid, sizeof ( grh->dgid ) );
96        }
97
98        /* Construct BTH */
99        bth->opcode = BTH_OPCODE_UD_SEND;
100        bth->se__m__padcnt__tver = ( pad_len << 4 );
101        bth->pkey = htons ( ibdev->pkey );
102        bth->dest_qp = htonl ( av->qpn );
103        bth->ack__psn = htonl ( ( qp->send.psn++ ) & 0xffffffUL );
104
105        /* Construct DETH */
106        deth->qkey = htonl ( av->qkey );
107        deth->src_qp = htonl ( qp->ext_qpn );
108
109        DBGCP_HDA ( ibdev, 0, iobuf->data,
110                    ( iob_len ( iobuf ) - orig_iob_len ) );
111
112        return 0;
113}
114
115/**
116 * Remove IB headers
117 *
118 * @v ibdev             Infiniband device
119 * @v iobuf             I/O buffer containing headers
120 * @v qp                Queue pair to fill in, or NULL
121 * @v payload_len       Payload length to fill in, or NULL
122 * @v av                Address vector to fill in
123 */
124int ib_pull ( struct ib_device *ibdev, struct io_buffer *iobuf,
125              struct ib_queue_pair **qp, size_t *payload_len,
126              struct ib_address_vector *av ) {
127        struct ib_local_route_header *lrh;
128        struct ib_global_route_header *grh;
129        struct ib_base_transport_header *bth;
130        struct ib_datagram_extended_transport_header *deth;
131        size_t orig_iob_len = iob_len ( iobuf );
132        unsigned int lnh;
133        size_t pad_len;
134        unsigned long qpn;
135        unsigned int lid;
136
137        /* Clear return values */
138        if ( qp )
139                *qp = NULL;
140        if ( payload_len )
141                *payload_len = 0;
142        memset ( av, 0, sizeof ( *av ) );
143
144        /* Extract LRH */
145        if ( iob_len ( iobuf ) < sizeof ( *lrh ) ) {
146                DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) for LRH\n",
147                       ibdev, iob_len ( iobuf ) );
148                return -EINVAL;
149        }
150        lrh = iobuf->data;
151        iob_pull ( iobuf, sizeof ( *lrh ) );
152        av->lid = ntohs ( lrh->slid );
153        av->sl = ( lrh->sl__lnh >> 4 );
154        lnh = ( lrh->sl__lnh & 0x3 );
155        lid = ntohs ( lrh->dlid );
156
157        /* Reject unsupported packets */
158        if ( ! ( ( lnh == IB_LNH_BTH ) || ( lnh == IB_LNH_GRH ) ) ) {
159                DBGC ( ibdev, "IBDEV %p RX unsupported LNH %x\n",
160                       ibdev, lnh );
161                return -ENOTSUP;
162        }
163
164        /* Extract GRH, if present */
165        if ( lnh == IB_LNH_GRH ) {
166                if ( iob_len ( iobuf ) < sizeof ( *grh ) ) {
167                        DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) "
168                               "for GRH\n", ibdev, iob_len ( iobuf ) );
169                        return -EINVAL;
170                }
171                grh = iobuf->data;
172                iob_pull ( iobuf, sizeof ( *grh ) );
173                av->gid_present = 1;
174                memcpy ( &av->gid, &grh->sgid, sizeof ( av->gid ) );
175        } else {
176                grh = NULL;
177        }
178
179        /* Extract BTH */
180        if ( iob_len ( iobuf ) < sizeof ( *bth ) ) {
181                DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) for BTH\n",
182                       ibdev, iob_len ( iobuf ) );
183                return -EINVAL;
184        }
185        bth = iobuf->data;
186        iob_pull ( iobuf, sizeof ( *bth ) );
187        if ( bth->opcode != BTH_OPCODE_UD_SEND ) {
188                DBGC ( ibdev, "IBDEV %p unsupported BTH opcode %x\n",
189                       ibdev, bth->opcode );
190                return -ENOTSUP;
191        }
192        qpn = ntohl ( bth->dest_qp );
193
194        /* Extract DETH */
195        if ( iob_len ( iobuf ) < sizeof ( *deth ) ) {
196                DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) for DETH\n",
197                       ibdev, iob_len ( iobuf ) );
198                return -EINVAL;
199        }
200        deth = iobuf->data;
201        iob_pull ( iobuf, sizeof ( *deth ) );
202        av->qpn = ntohl ( deth->src_qp );
203        av->qkey = ntohl ( deth->qkey );
204
205        /* Calculate payload length, if applicable */
206        if ( payload_len ) {
207                pad_len = ( ( bth->se__m__padcnt__tver >> 4 ) & 0x3 );
208                *payload_len = ( ( ntohs ( lrh->length ) << 2 )
209                                 - ( orig_iob_len - iob_len ( iobuf ) )
210                                 - pad_len - 4 /* ICRC */ );
211        }
212
213        /* Determine destination QP, if applicable */
214        if ( qp ) {
215                if ( IB_LID_MULTICAST ( lid ) && grh ) {
216                        if ( ! ( *qp = ib_find_qp_mgid ( ibdev, &grh->dgid ))){
217                                DBGC ( ibdev, "IBDEV %p RX for unknown MGID "
218                                       "%08x:%08x:%08x:%08x\n", ibdev,
219                                       ntohl ( grh->dgid.u.dwords[0] ),
220                                       ntohl ( grh->dgid.u.dwords[1] ),
221                                       ntohl ( grh->dgid.u.dwords[2] ),
222                                       ntohl ( grh->dgid.u.dwords[3] ) );
223                                return -ENODEV;
224                        }
225                } else {
226                        if ( ! ( *qp = ib_find_qp_qpn ( ibdev, qpn ) ) ) {
227                                DBGC ( ibdev, "IBDEV %p RX for nonexistent "
228                                       "QPN %lx\n", ibdev, qpn );
229                                return -ENODEV;
230                        }
231                }
232                assert ( *qp );
233        }
234
235        DBGC2 ( ibdev, "IBDEV %p RX %04x:%08lx <= %04x:%08lx (key %08x)\n",
236                ibdev, lid, ( IB_LID_MULTICAST( lid ) ?
237                              ( qp ? (*qp)->ext_qpn : -1UL ) : qpn ),
238                av->lid, av->qpn, ntohl ( deth->qkey ) );
239        DBGCP_HDA ( ibdev, 0,
240                    ( iobuf->data - ( orig_iob_len - iob_len ( iobuf ) ) ),
241                    ( orig_iob_len - iob_len ( iobuf ) ) );
242
243        return 0;
244}
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