zfcp: trace full payload of all SAN records (req,resp,iels)
This was lost with commitsteinar/wifi_calib_4_9_kernel2c55b750a8("[SCSI] zfcp: Redesign of the debug tracing for SAN records.") but is necessary for problem determination, e.g. to see the currently active zone set during automatic port scan. For the large GPN_FT response (4 pages), save space by not dumping any empty residual entries. Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com> Fixes:2c55b750a8("[SCSI] zfcp: Redesign of the debug tracing for SAN records.") Cc: <stable@vger.kernel.org> #2.6.38+ Reviewed-by: Alexey Ishchuk <aishchuk@linux.vnet.ibm.com> Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Steffen Maier
Martin K. Petersen
parent
94db3725f0
commit
aceeffbb59
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@ -3,7 +3,7 @@
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*
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* Debug traces for zfcp.
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*
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* Copyright IBM Corp. 2002, 2015
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* Copyright IBM Corp. 2002, 2016
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*/
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#define KMSG_COMPONENT "zfcp"
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@ -356,12 +356,15 @@ void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
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}
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static inline
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void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
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u64 req_id, u32 d_id)
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void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf,
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char *paytag, struct scatterlist *sg, u8 id, u16 len,
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u64 req_id, u32 d_id, u16 cap_len)
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{
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struct zfcp_dbf_san *rec = &dbf->san_buf;
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u16 rec_len;
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unsigned long flags;
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struct zfcp_dbf_pay *payload = &dbf->pay_buf;
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u16 pay_sum = 0;
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spin_lock_irqsave(&dbf->san_lock, flags);
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memset(rec, 0, sizeof(*rec));
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@ -369,10 +372,41 @@ void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
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rec->id = id;
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rec->fsf_req_id = req_id;
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rec->d_id = d_id;
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rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
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memcpy(rec->payload, data, rec_len);
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memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
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rec->pl_len = len; /* full length even if we cap pay below */
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if (!sg)
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goto out;
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rec_len = min_t(unsigned int, sg->length, ZFCP_DBF_SAN_MAX_PAYLOAD);
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memcpy(rec->payload, sg_virt(sg), rec_len); /* part of 1st sg entry */
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if (len <= rec_len)
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goto out; /* skip pay record if full content in rec->payload */
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/* if (len > rec_len):
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* dump data up to cap_len ignoring small duplicate in rec->payload
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*/
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spin_lock_irqsave(&dbf->pay_lock, flags);
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memset(payload, 0, sizeof(*payload));
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memcpy(payload->area, paytag, ZFCP_DBF_TAG_LEN);
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payload->fsf_req_id = req_id;
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payload->counter = 0;
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for (; sg && pay_sum < cap_len; sg = sg_next(sg)) {
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u16 pay_len, offset = 0;
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while (offset < sg->length && pay_sum < cap_len) {
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pay_len = min((u16)ZFCP_DBF_PAY_MAX_REC,
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(u16)(sg->length - offset));
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/* cap_len <= pay_sum < cap_len+ZFCP_DBF_PAY_MAX_REC */
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memcpy(payload->data, sg_virt(sg) + offset, pay_len);
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debug_event(dbf->pay, 1, payload,
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zfcp_dbf_plen(pay_len));
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payload->counter++;
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offset += pay_len;
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pay_sum += pay_len;
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}
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}
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spin_unlock(&dbf->pay_lock);
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out:
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debug_event(dbf->san, 1, rec, sizeof(*rec));
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spin_unlock_irqrestore(&dbf->san_lock, flags);
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}
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@ -389,9 +423,62 @@ void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
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struct zfcp_fsf_ct_els *ct_els = fsf->data;
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u16 length;
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length = (u16)(ct_els->req->length);
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zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
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fsf->req_id, d_id);
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length = (u16)zfcp_qdio_real_bytes(ct_els->req);
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zfcp_dbf_san(tag, dbf, "san_req", ct_els->req, ZFCP_DBF_SAN_REQ,
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length, fsf->req_id, d_id, length);
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}
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static u16 zfcp_dbf_san_res_cap_len_if_gpn_ft(char *tag,
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struct zfcp_fsf_req *fsf,
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u16 len)
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{
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struct zfcp_fsf_ct_els *ct_els = fsf->data;
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struct fc_ct_hdr *reqh = sg_virt(ct_els->req);
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struct fc_ns_gid_ft *reqn = (struct fc_ns_gid_ft *)(reqh + 1);
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struct scatterlist *resp_entry = ct_els->resp;
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struct fc_gpn_ft_resp *acc;
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int max_entries, x, last = 0;
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if (!(memcmp(tag, "fsscth2", 7) == 0
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&& ct_els->d_id == FC_FID_DIR_SERV
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&& reqh->ct_rev == FC_CT_REV
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&& reqh->ct_in_id[0] == 0
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&& reqh->ct_in_id[1] == 0
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&& reqh->ct_in_id[2] == 0
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&& reqh->ct_fs_type == FC_FST_DIR
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&& reqh->ct_fs_subtype == FC_NS_SUBTYPE
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&& reqh->ct_options == 0
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&& reqh->_ct_resvd1 == 0
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&& reqh->ct_cmd == FC_NS_GPN_FT
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/* reqh->ct_mr_size can vary so do not match but read below */
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&& reqh->_ct_resvd2 == 0
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&& reqh->ct_reason == 0
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&& reqh->ct_explan == 0
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&& reqh->ct_vendor == 0
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&& reqn->fn_resvd == 0
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&& reqn->fn_domain_id_scope == 0
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&& reqn->fn_area_id_scope == 0
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&& reqn->fn_fc4_type == FC_TYPE_FCP))
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return len; /* not GPN_FT response so do not cap */
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acc = sg_virt(resp_entry);
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max_entries = (reqh->ct_mr_size * 4 / sizeof(struct fc_gpn_ft_resp))
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+ 1 /* zfcp_fc_scan_ports: bytes correct, entries off-by-one
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* to account for header as 1st pseudo "entry" */;
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/* the basic CT_IU preamble is the same size as one entry in the GPN_FT
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* response, allowing us to skip special handling for it - just skip it
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*/
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for (x = 1; x < max_entries && !last; x++) {
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if (x % (ZFCP_FC_GPN_FT_ENT_PAGE + 1))
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acc++;
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else
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acc = sg_virt(++resp_entry);
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last = acc->fp_flags & FC_NS_FID_LAST;
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}
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len = min(len, (u16)(x * sizeof(struct fc_gpn_ft_resp)));
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return len; /* cap after last entry */
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}
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/**
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@ -405,9 +492,10 @@ void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
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struct zfcp_fsf_ct_els *ct_els = fsf->data;
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u16 length;
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length = (u16)(ct_els->resp->length);
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zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
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fsf->req_id, ct_els->d_id);
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length = (u16)zfcp_qdio_real_bytes(ct_els->resp);
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zfcp_dbf_san(tag, dbf, "san_res", ct_els->resp, ZFCP_DBF_SAN_RES,
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length, fsf->req_id, ct_els->d_id,
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zfcp_dbf_san_res_cap_len_if_gpn_ft(tag, fsf, length));
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}
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/**
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@ -421,11 +509,13 @@ void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
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struct fsf_status_read_buffer *srb =
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(struct fsf_status_read_buffer *) fsf->data;
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u16 length;
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struct scatterlist sg;
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length = (u16)(srb->length -
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offsetof(struct fsf_status_read_buffer, payload));
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zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
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fsf->req_id, ntoh24(srb->d_id));
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sg_init_one(&sg, srb->payload.data, length);
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zfcp_dbf_san(tag, dbf, "san_els", &sg, ZFCP_DBF_SAN_ELS, length,
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fsf->req_id, ntoh24(srb->d_id), length);
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}
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/**
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@ -115,6 +115,7 @@ struct zfcp_dbf_san {
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u32 d_id;
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#define ZFCP_DBF_SAN_MAX_PAYLOAD (FC_CT_HDR_LEN + 32)
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char payload[ZFCP_DBF_SAN_MAX_PAYLOAD];
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u16 pl_len;
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} __packed;
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/**
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