diff options
Diffstat (limited to 'drivers/scsi/libfc/fc_elsct.c')
| -rw-r--r-- | drivers/scsi/libfc/fc_elsct.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_elsct.c b/drivers/scsi/libfc/fc_elsct.c new file mode 100644 index 000000000..c2384d501 --- /dev/null +++ b/drivers/scsi/libfc/fc_elsct.c @@ -0,0 +1,152 @@ +/* + * Copyright(c) 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * Provide interface to send ELS/CT FC frames + */ + +#include <linux/export.h> +#include <asm/unaligned.h> +#include <scsi/fc/fc_gs.h> +#include <scsi/fc/fc_ns.h> +#include <scsi/fc/fc_els.h> +#include <scsi/libfc.h> +#include <scsi/fc_encode.h> +#include "fc_libfc.h" + +/** + * fc_elsct_send() - Send an ELS or CT frame + * @lport: The local port to send the frame on + * @did: The destination ID for the frame + * @fp: The frame to be sent + * @op: The operational code + * @resp: The callback routine when the response is received + * @arg: The argument to pass to the response callback routine + * @timer_msec: The timeout period for the frame (in msecs) + */ +struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did, + struct fc_frame *fp, unsigned int op, + void (*resp)(struct fc_seq *, + struct fc_frame *, + void *), + void *arg, u32 timer_msec) +{ + enum fc_rctl r_ctl; + enum fc_fh_type fh_type; + int rc; + + /* ELS requests */ + if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) + rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type); + else { + /* CT requests */ + rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did); + } + + if (rc) { + fc_frame_free(fp); + return NULL; + } + + fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type, + FC_FCTL_REQ, 0); + + return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec); +} +EXPORT_SYMBOL(fc_elsct_send); + +/** + * fc_elsct_init() - Initialize the ELS/CT layer + * @lport: The local port to initialize the ELS/CT layer for + */ +int fc_elsct_init(struct fc_lport *lport) +{ + if (!lport->tt.elsct_send) + lport->tt.elsct_send = fc_elsct_send; + + return 0; +} +EXPORT_SYMBOL(fc_elsct_init); + +/** + * fc_els_resp_type() - Return a string describing the ELS response + * @fp: The frame pointer or possible error code + */ +const char *fc_els_resp_type(struct fc_frame *fp) +{ + const char *msg; + struct fc_frame_header *fh; + struct fc_ct_hdr *ct; + + if (IS_ERR(fp)) { + switch (-PTR_ERR(fp)) { + case FC_NO_ERR: + msg = "response no error"; + break; + case FC_EX_TIMEOUT: + msg = "response timeout"; + break; + case FC_EX_CLOSED: + msg = "response closed"; + break; + default: + msg = "response unknown error"; + break; + } + } else { + fh = fc_frame_header_get(fp); + switch (fh->fh_type) { + case FC_TYPE_ELS: + switch (fc_frame_payload_op(fp)) { + case ELS_LS_ACC: + msg = "accept"; + break; + case ELS_LS_RJT: + msg = "reject"; + break; + default: + msg = "response unknown ELS"; + break; + } + break; + case FC_TYPE_CT: + ct = fc_frame_payload_get(fp, sizeof(*ct)); + if (ct) { + switch (ntohs(ct->ct_cmd)) { + case FC_FS_ACC: + msg = "CT accept"; + break; + case FC_FS_RJT: + msg = "CT reject"; + break; + default: + msg = "response unknown CT"; + break; + } + } else { + msg = "short CT response"; + } + break; + default: + msg = "response not ELS or CT"; + break; + } + } + return msg; +} |