1a61127c2SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
242e9a92fSRobert Love /*
342e9a92fSRobert Love * Copyright(c) 2008 Intel Corporation. All rights reserved.
442e9a92fSRobert Love *
542e9a92fSRobert Love * Maintained at www.Open-FCoE.org
642e9a92fSRobert Love */
742e9a92fSRobert Love
842e9a92fSRobert Love /*
942e9a92fSRobert Love * Provide interface to send ELS/CT FC frames
1042e9a92fSRobert Love */
1142e9a92fSRobert Love
1209703660SPaul Gortmaker #include <linux/export.h>
1342e9a92fSRobert Love #include <asm/unaligned.h>
1442e9a92fSRobert Love #include <scsi/fc/fc_gs.h>
1542e9a92fSRobert Love #include <scsi/fc/fc_ns.h>
1642e9a92fSRobert Love #include <scsi/fc/fc_els.h>
1742e9a92fSRobert Love #include <scsi/libfc.h>
18*e31ac898SArnd Bergmann #include "fc_encode.h"
19c6b21c93SBart Van Assche #include "fc_libfc.h"
2042e9a92fSRobert Love
213a3b42bfSRobert Love /**
223a3b42bfSRobert Love * fc_elsct_send() - Send an ELS or CT frame
233a3b42bfSRobert Love * @lport: The local port to send the frame on
243a3b42bfSRobert Love * @did: The destination ID for the frame
253a3b42bfSRobert Love * @fp: The frame to be sent
263a3b42bfSRobert Love * @op: The operational code
273a3b42bfSRobert Love * @resp: The callback routine when the response is received
283a3b42bfSRobert Love * @arg: The argument to pass to the response callback routine
293a3b42bfSRobert Love * @timer_msec: The timeout period for the frame (in msecs)
3042e9a92fSRobert Love */
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)313a3b42bfSRobert Love struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,
323a3b42bfSRobert Love struct fc_frame *fp, unsigned int op,
3342e9a92fSRobert Love void (*resp)(struct fc_seq *,
343a3b42bfSRobert Love struct fc_frame *,
353a3b42bfSRobert Love void *),
3642e9a92fSRobert Love void *arg, u32 timer_msec)
3742e9a92fSRobert Love {
3842e9a92fSRobert Love enum fc_rctl r_ctl;
3942e9a92fSRobert Love enum fc_fh_type fh_type;
4042e9a92fSRobert Love int rc;
4142e9a92fSRobert Love
4242e9a92fSRobert Love /* ELS requests */
4342e9a92fSRobert Love if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
44a46f327aSJoe Eykholt rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
45a46f327aSJoe Eykholt else {
4642e9a92fSRobert Love /* CT requests */
471ea2c1daSNeerav Parikh rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did);
48a46f327aSJoe Eykholt }
4942e9a92fSRobert Love
508f550f93SChris Leech if (rc) {
518f550f93SChris Leech fc_frame_free(fp);
5242e9a92fSRobert Love return NULL;
538f550f93SChris Leech }
5442e9a92fSRobert Love
557b2787ecSRobert Love fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
5624f089e2SJoe Eykholt FC_FCTL_REQ, 0);
5742e9a92fSRobert Love
583afd2d15SHannes Reinecke return fc_exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
5942e9a92fSRobert Love }
6011b56188SChris Leech EXPORT_SYMBOL(fc_elsct_send);
6142e9a92fSRobert Love
623a3b42bfSRobert Love /**
633a3b42bfSRobert Love * fc_elsct_init() - Initialize the ELS/CT layer
643a3b42bfSRobert Love * @lport: The local port to initialize the ELS/CT layer for
653a3b42bfSRobert Love */
fc_elsct_init(struct fc_lport * lport)6642e9a92fSRobert Love int fc_elsct_init(struct fc_lport *lport)
6742e9a92fSRobert Love {
6842e9a92fSRobert Love if (!lport->tt.elsct_send)
6942e9a92fSRobert Love lport->tt.elsct_send = fc_elsct_send;
7042e9a92fSRobert Love
7142e9a92fSRobert Love return 0;
7242e9a92fSRobert Love }
7342e9a92fSRobert Love EXPORT_SYMBOL(fc_elsct_init);
74f657d299SJoe Eykholt
75f657d299SJoe Eykholt /**
763a3b42bfSRobert Love * fc_els_resp_type() - Return a string describing the ELS response
773a3b42bfSRobert Love * @fp: The frame pointer or possible error code
78f657d299SJoe Eykholt */
fc_els_resp_type(struct fc_frame * fp)79f657d299SJoe Eykholt const char *fc_els_resp_type(struct fc_frame *fp)
80f657d299SJoe Eykholt {
81f657d299SJoe Eykholt const char *msg;
8252a6690dSJoe Eykholt struct fc_frame_header *fh;
8352a6690dSJoe Eykholt struct fc_ct_hdr *ct;
8452a6690dSJoe Eykholt
85f657d299SJoe Eykholt if (IS_ERR(fp)) {
86f657d299SJoe Eykholt switch (-PTR_ERR(fp)) {
87f657d299SJoe Eykholt case FC_NO_ERR:
88f657d299SJoe Eykholt msg = "response no error";
89f657d299SJoe Eykholt break;
90f657d299SJoe Eykholt case FC_EX_TIMEOUT:
91f657d299SJoe Eykholt msg = "response timeout";
92f657d299SJoe Eykholt break;
93f657d299SJoe Eykholt case FC_EX_CLOSED:
94f657d299SJoe Eykholt msg = "response closed";
95f657d299SJoe Eykholt break;
96f657d299SJoe Eykholt default:
97f657d299SJoe Eykholt msg = "response unknown error";
98f657d299SJoe Eykholt break;
99f657d299SJoe Eykholt }
100f657d299SJoe Eykholt } else {
10152a6690dSJoe Eykholt fh = fc_frame_header_get(fp);
10252a6690dSJoe Eykholt switch (fh->fh_type) {
10352a6690dSJoe Eykholt case FC_TYPE_ELS:
104f657d299SJoe Eykholt switch (fc_frame_payload_op(fp)) {
105f657d299SJoe Eykholt case ELS_LS_ACC:
106f657d299SJoe Eykholt msg = "accept";
107f657d299SJoe Eykholt break;
108f657d299SJoe Eykholt case ELS_LS_RJT:
109f657d299SJoe Eykholt msg = "reject";
110f657d299SJoe Eykholt break;
111f657d299SJoe Eykholt default:
112f657d299SJoe Eykholt msg = "response unknown ELS";
113f657d299SJoe Eykholt break;
114f657d299SJoe Eykholt }
11552a6690dSJoe Eykholt break;
11652a6690dSJoe Eykholt case FC_TYPE_CT:
11752a6690dSJoe Eykholt ct = fc_frame_payload_get(fp, sizeof(*ct));
11852a6690dSJoe Eykholt if (ct) {
11952a6690dSJoe Eykholt switch (ntohs(ct->ct_cmd)) {
12052a6690dSJoe Eykholt case FC_FS_ACC:
12152a6690dSJoe Eykholt msg = "CT accept";
12252a6690dSJoe Eykholt break;
12352a6690dSJoe Eykholt case FC_FS_RJT:
12452a6690dSJoe Eykholt msg = "CT reject";
12552a6690dSJoe Eykholt break;
12652a6690dSJoe Eykholt default:
12752a6690dSJoe Eykholt msg = "response unknown CT";
12852a6690dSJoe Eykholt break;
12952a6690dSJoe Eykholt }
13052a6690dSJoe Eykholt } else {
13152a6690dSJoe Eykholt msg = "short CT response";
13252a6690dSJoe Eykholt }
13352a6690dSJoe Eykholt break;
13452a6690dSJoe Eykholt default:
13552a6690dSJoe Eykholt msg = "response not ELS or CT";
13652a6690dSJoe Eykholt break;
13752a6690dSJoe Eykholt }
138f657d299SJoe Eykholt }
139f657d299SJoe Eykholt return msg;
140f657d299SJoe Eykholt }
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