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[infiniband] Add raw packet parser and constructor
This can be used with cards that require the driver to construct and parse packet headers manually. Headers are optionally handled out-of-line from the packet payload, since some such cards will split received headers into a separate ring buffer.
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Michael Brown
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Nov 11, 2008
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/* | ||
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public License as | ||
* published by the Free Software Foundation; either version 2 of the | ||
* License, or any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, but | ||
* WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
*/ | ||
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#include <stdint.h> | ||
#include <stdlib.h> | ||
#include <string.h> | ||
#include <errno.h> | ||
#include <byteswap.h> | ||
#include <gpxe/iobuf.h> | ||
#include <gpxe/infiniband.h> | ||
#include <gpxe/ib_packet.h> | ||
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/** | ||
* @file | ||
* | ||
* Infiniband Packet Formats | ||
* | ||
*/ | ||
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/** | ||
* Add IB headers | ||
* | ||
* @v ibdev Infiniband device | ||
* @v iobuf I/O buffer to contain headers | ||
* @v qp Queue pair | ||
* @v payload_len Payload length | ||
* @v av Address vector | ||
*/ | ||
int ib_push ( struct ib_device *ibdev, struct io_buffer *iobuf, | ||
struct ib_queue_pair *qp, size_t payload_len, | ||
const struct ib_address_vector *av ) { | ||
struct ib_local_route_header *lrh; | ||
struct ib_global_route_header *grh; | ||
struct ib_base_transport_header *bth; | ||
struct ib_datagram_extended_transport_header *deth; | ||
size_t orig_iob_len = iob_len ( iobuf ); | ||
size_t pad_len; | ||
size_t lrh_len; | ||
size_t grh_len; | ||
unsigned int vl; | ||
unsigned int lnh; | ||
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DBGC2 ( ibdev, "IBDEV %p TX %04x:%08lx => %04x:%08lx (key %08lx)\n", | ||
ibdev, ibdev->lid, qp->qpn, av->lid, av->qpn, av->qkey ); | ||
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/* Calculate packet length */ | ||
pad_len = ( (-payload_len) & 0x3 ); | ||
payload_len += pad_len; | ||
payload_len += 4; /* ICRC */ | ||
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/* Reserve space for headers */ | ||
orig_iob_len = iob_len ( iobuf ); | ||
deth = iob_push ( iobuf, sizeof ( *deth ) ); | ||
bth = iob_push ( iobuf, sizeof ( *bth ) ); | ||
grh_len = ( payload_len + iob_len ( iobuf ) - orig_iob_len ); | ||
grh = ( av->gid_present ? | ||
iob_push ( iobuf, sizeof ( *grh ) ) : NULL ); | ||
lrh = iob_push ( iobuf, sizeof ( *lrh ) ); | ||
lrh_len = ( payload_len + iob_len ( iobuf ) - orig_iob_len ); | ||
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/* Construct LRH */ | ||
vl = ( ( av->qpn == IB_QPN_SMP ) ? IB_VL_SMP : IB_VL_DEFAULT ); | ||
lrh->vl__lver = ( vl << 4 ); | ||
lnh = ( grh ? IB_LNH_GRH : IB_LNH_BTH ); | ||
lrh->sl__lnh = ( ( av->sl << 4 ) | lnh ); | ||
lrh->dlid = htons ( av->lid ); | ||
lrh->length = htons ( lrh_len >> 2 ); | ||
lrh->slid = htons ( ibdev->lid ); | ||
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/* Construct GRH, if required */ | ||
if ( grh ) { | ||
grh->ipver__tclass__flowlabel = | ||
htonl ( IB_GRH_IPVER_IPv6 << 28 ); | ||
grh->paylen = htons ( grh_len ); | ||
grh->nxthdr = IB_GRH_NXTHDR_IBA; | ||
grh->hoplmt = 0; | ||
memcpy ( &grh->sgid, &ibdev->gid, sizeof ( grh->sgid ) ); | ||
memcpy ( &grh->dgid, &av->gid, sizeof ( grh->dgid ) ); | ||
} | ||
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/* Construct BTH */ | ||
bth->opcode = BTH_OPCODE_UD_SEND; | ||
bth->se__m__padcnt__tver = ( pad_len << 4 ); | ||
bth->pkey = htons ( ibdev->pkey ); | ||
bth->dest_qp = htonl ( av->qpn ); | ||
bth->ack__psn = htonl ( ( ibdev->psn++ ) & 0xffffffUL ); | ||
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/* Construct DETH */ | ||
deth->qkey = htonl ( av->qkey ); | ||
deth->src_qp = htonl ( qp->qpn ); | ||
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DBGCP_HDA ( ibdev, 0, iobuf->data, | ||
( iob_len ( iobuf ) - orig_iob_len ) ); | ||
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return 0; | ||
} | ||
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/** | ||
* Remove IB headers | ||
* | ||
* @v ibdev Infiniband device | ||
* @v iobuf I/O buffer containing headers | ||
* @v qp Queue pair to fill in, or NULL | ||
* @v payload_len Payload length to fill in, or NULL | ||
* @v av Address vector to fill in | ||
*/ | ||
int ib_pull ( struct ib_device *ibdev, struct io_buffer *iobuf, | ||
struct ib_queue_pair **qp, size_t *payload_len, | ||
struct ib_address_vector *av ) { | ||
struct ib_local_route_header *lrh; | ||
struct ib_global_route_header *grh; | ||
struct ib_base_transport_header *bth; | ||
struct ib_datagram_extended_transport_header *deth; | ||
size_t orig_iob_len = iob_len ( iobuf ); | ||
unsigned int lnh; | ||
size_t pad_len; | ||
unsigned long qpn; | ||
unsigned int lid; | ||
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/* Clear return values */ | ||
if ( qp ) | ||
*qp = NULL; | ||
if ( payload_len ) | ||
*payload_len = 0; | ||
memset ( av, 0, sizeof ( *av ) ); | ||
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/* Extract LRH */ | ||
if ( iob_len ( iobuf ) < sizeof ( *lrh ) ) { | ||
DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) for LRH\n", | ||
ibdev, iob_len ( iobuf ) ); | ||
return -EINVAL; | ||
} | ||
lrh = iobuf->data; | ||
iob_pull ( iobuf, sizeof ( *lrh ) ); | ||
av->lid = ntohs ( lrh->slid ); | ||
av->sl = ( lrh->sl__lnh >> 4 ); | ||
lnh = ( lrh->sl__lnh & 0x3 ); | ||
lid = ntohs ( lrh->dlid ); | ||
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/* Reject unsupported packets */ | ||
if ( ! ( ( lnh == IB_LNH_BTH ) || ( lnh == IB_LNH_GRH ) ) ) { | ||
DBGC ( ibdev, "IBDEV %p RX unsupported LNH %x\n", | ||
ibdev, lnh ); | ||
return -ENOTSUP; | ||
} | ||
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/* Extract GRH, if present */ | ||
if ( lnh == IB_LNH_GRH ) { | ||
if ( iob_len ( iobuf ) < sizeof ( *grh ) ) { | ||
DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) " | ||
"for GRH\n", ibdev, iob_len ( iobuf ) ); | ||
return -EINVAL; | ||
} | ||
grh = iobuf->data; | ||
iob_pull ( iobuf, sizeof ( *grh ) ); | ||
av->gid_present = 1; | ||
memcpy ( &av->gid, &grh->sgid, sizeof ( av->gid ) ); | ||
} else { | ||
grh = NULL; | ||
} | ||
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/* Extract BTH */ | ||
if ( iob_len ( iobuf ) < sizeof ( *bth ) ) { | ||
DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) for BTH\n", | ||
ibdev, iob_len ( iobuf ) ); | ||
return -EINVAL; | ||
} | ||
bth = iobuf->data; | ||
iob_pull ( iobuf, sizeof ( *bth ) ); | ||
if ( bth->opcode != BTH_OPCODE_UD_SEND ) { | ||
DBGC ( ibdev, "IBDEV %p unsupported BTH opcode %x\n", | ||
ibdev, bth->opcode ); | ||
return -ENOTSUP; | ||
} | ||
qpn = ntohl ( bth->dest_qp ); | ||
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/* Extract DETH */ | ||
if ( iob_len ( iobuf ) < sizeof ( *deth ) ) { | ||
DBGC ( ibdev, "IBDEV %p RX too short (%zd bytes) for DETH\n", | ||
ibdev, iob_len ( iobuf ) ); | ||
return -EINVAL; | ||
} | ||
deth = iobuf->data; | ||
iob_pull ( iobuf, sizeof ( *deth ) ); | ||
av->qpn = ntohl ( deth->src_qp ); | ||
av->qkey = ntohl ( deth->qkey ); | ||
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/* Calculate payload length, if applicable */ | ||
if ( payload_len ) { | ||
pad_len = ( ( bth->se__m__padcnt__tver >> 4 ) & 0x3 ); | ||
*payload_len = ( ( ntohs ( lrh->length ) << 2 ) | ||
- ( orig_iob_len - iob_len ( iobuf ) ) | ||
- pad_len - 4 /* ICRC */ ); | ||
} | ||
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/* Determine destination QP, if applicable */ | ||
if ( qp ) { | ||
if ( IB_LID_MULTICAST ( lid ) && grh ) { | ||
*qp = ib_find_qp_mgid ( ibdev, &grh->dgid ); | ||
} else { | ||
*qp = ib_find_qp_qpn ( ibdev, qpn ); | ||
} | ||
if ( ! *qp ) { | ||
DBGC ( ibdev, "IBDEV %p RX for nonexistent QP\n", | ||
ibdev ); | ||
return -ENODEV; | ||
} | ||
} | ||
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DBGC2 ( ibdev, "IBDEV %p RX %04x:%08lx <= %04x:%08lx (key %08lx)\n", | ||
ibdev, lid, | ||
( IB_LID_MULTICAST( lid ) ? ( qp ? (*qp)->qpn : -1UL ) : qpn ), | ||
av->lid, av->qpn, ntohl ( deth->qkey ) ); | ||
DBGCP_HDA ( ibdev, 0, | ||
( iobuf->data - ( orig_iob_len - iob_len ( iobuf ) ) ), | ||
( orig_iob_len - iob_len ( iobuf ) ) ); | ||
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return 0; | ||
} |
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