diff options
Diffstat (limited to 'drivers/scsi/libfc/fc_rport.c')
| -rw-r--r-- | drivers/scsi/libfc/fc_rport.c | 192 |
1 files changed, 98 insertions, 94 deletions
diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c index 520325867e2b..c25979d96808 100644 --- a/drivers/scsi/libfc/fc_rport.c +++ b/drivers/scsi/libfc/fc_rport.c @@ -1,19 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright(c) 2007 - 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 */ @@ -67,11 +55,11 @@ #include <linux/export.h> #include <linux/rculist.h> -#include <asm/unaligned.h> +#include <linux/unaligned.h> #include <scsi/libfc.h> -#include <scsi/fc_encode.h> +#include "fc_encode.h" #include "fc_libfc.h" static struct workqueue_struct *rport_event_queue; @@ -133,21 +121,26 @@ EXPORT_SYMBOL(fc_rport_lookup); /** * fc_rport_create() - Create a new remote port * @lport: The local port this remote port will be associated with - * @ids: The identifiers for the new remote port + * @port_id: The identifiers for the new remote port * * The remote port will start in the INIT state. - * - * Locking note: must be called with the disc_mutex held. */ struct fc_rport_priv *fc_rport_create(struct fc_lport *lport, u32 port_id) { struct fc_rport_priv *rdata; + size_t rport_priv_size = sizeof(*rdata); + + lockdep_assert_held(&lport->disc.disc_mutex); rdata = fc_rport_lookup(lport, port_id); - if (rdata) + if (rdata) { + kref_put(&rdata->kref, fc_rport_destroy); return rdata; + } - rdata = kzalloc(sizeof(*rdata) + lport->rport_priv_size, GFP_KERNEL); + if (lport->rport_priv_size > 0) + rport_priv_size = lport->rport_priv_size; + rdata = kzalloc(rport_priv_size, GFP_KERNEL); if (!rdata) return NULL; @@ -245,12 +238,12 @@ static unsigned int fc_plogi_get_maxframe(struct fc_els_flogi *flp, * fc_rport_state_enter() - Change the state of a remote port * @rdata: The remote port whose state should change * @new: The new state - * - * Locking Note: Called with the rport lock held */ static void fc_rport_state_enter(struct fc_rport_priv *rdata, enum fc_rport_state new) { + lockdep_assert_held(&rdata->rp_mutex); + if (rdata->rp_state != new) rdata->retries = 0; rdata->rp_state = new; @@ -383,11 +376,11 @@ static void fc_rport_work(struct work_struct *work) fc_rport_enter_flogi(rdata); mutex_unlock(&rdata->rp_mutex); } else { + mutex_unlock(&rdata->rp_mutex); FC_RPORT_DBG(rdata, "work delete\n"); mutex_lock(&lport->disc.disc_mutex); list_del_rcu(&rdata->peers); mutex_unlock(&lport->disc.disc_mutex); - mutex_unlock(&rdata->rp_mutex); kref_put(&rdata->kref, fc_rport_destroy); } } else { @@ -469,8 +462,6 @@ EXPORT_SYMBOL(fc_rport_login); * @rdata: The remote port to be deleted * @event: The event to report as the reason for deletion * - * Locking Note: Called with the rport lock held. - * * Allow state change into DELETE only once. * * Call queue_work only if there's no event already pending. @@ -483,6 +474,8 @@ EXPORT_SYMBOL(fc_rport_login); static void fc_rport_enter_delete(struct fc_rport_priv *rdata, enum fc_rport_event event) { + lockdep_assert_held(&rdata->rp_mutex); + if (rdata->rp_state == RPORT_ST_DELETE) return; @@ -490,10 +483,11 @@ static void fc_rport_enter_delete(struct fc_rport_priv *rdata, fc_rport_state_enter(rdata, RPORT_ST_DELETE); - kref_get(&rdata->kref); - if (rdata->event == RPORT_EV_NONE && - !queue_work(rport_event_queue, &rdata->event_work)) - kref_put(&rdata->kref, fc_rport_destroy); + if (rdata->event == RPORT_EV_NONE) { + kref_get(&rdata->kref); + if (!queue_work(rport_event_queue, &rdata->event_work)) + kref_put(&rdata->kref, fc_rport_destroy); + } rdata->event = event; } @@ -546,13 +540,12 @@ EXPORT_SYMBOL(fc_rport_logoff); * fc_rport_enter_ready() - Transition to the RPORT_ST_READY state * @rdata: The remote port that is ready * - * Locking Note: The rport lock is expected to be held before calling - * this routine. - * * Reference counting: schedules workqueue, does not modify kref */ static void fc_rport_enter_ready(struct fc_rport_priv *rdata) { + lockdep_assert_held(&rdata->rp_mutex); + fc_rport_state_enter(rdata, RPORT_ST_READY); FC_RPORT_DBG(rdata, "Port is Ready\n"); @@ -615,15 +608,14 @@ static void fc_rport_timeout(struct work_struct *work) * @rdata: The remote port the error is happened on * @err: The error code * - * Locking Note: The rport lock is expected to be held before - * calling this routine - * * Reference counting: does not modify kref */ static void fc_rport_error(struct fc_rport_priv *rdata, int err) { struct fc_lport *lport = rdata->local_port; + lockdep_assert_held(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Error %d in state %s, retries %d\n", -err, fc_rport_state(rdata), rdata->retries); @@ -643,6 +635,8 @@ static void fc_rport_error(struct fc_rport_priv *rdata, int err) fc_rport_enter_ready(rdata); break; case RPORT_ST_PRLI: + fc_rport_enter_plogi(rdata); + break; case RPORT_ST_ADISC: fc_rport_enter_logo(rdata); break; @@ -662,15 +656,14 @@ static void fc_rport_error(struct fc_rport_priv *rdata, int err) * If the error was an exchange timeout retry immediately, * otherwise wait for E_D_TOV. * - * Locking Note: The rport lock is expected to be held before - * calling this routine - * * Reference counting: increments kref when scheduling retry_work */ static void fc_rport_error_retry(struct fc_rport_priv *rdata, int err) { unsigned long delay = msecs_to_jiffies(rdata->e_d_tov); + lockdep_assert_held(&rdata->rp_mutex); + /* make sure this isn't an FC_EX_CLOSED error, never retry those */ if (err == -FC_EX_CLOSED) goto out; @@ -822,9 +815,6 @@ bad: * fc_rport_enter_flogi() - Send a FLOGI request to the remote port for p-mp * @rdata: The remote port to send a FLOGI to * - * Locking Note: The rport lock is expected to be held before calling - * this routine. - * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) @@ -832,6 +822,8 @@ static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; + lockdep_assert_held(&rdata->rp_mutex); + if (!lport->point_to_multipoint) return fc_rport_enter_plogi(rdata); @@ -863,7 +855,6 @@ static void fc_rport_enter_flogi(struct fc_rport_priv *rdata) static void fc_rport_recv_flogi_req(struct fc_lport *lport, struct fc_frame *rx_fp) { - struct fc_disc *disc; struct fc_els_flogi *flp; struct fc_rport_priv *rdata; struct fc_frame *fp = rx_fp; @@ -874,7 +865,6 @@ static void fc_rport_recv_flogi_req(struct fc_lport *lport, FC_RPORT_ID_DBG(lport, sid, "Received FLOGI request\n"); - disc = &lport->disc; if (!lport->point_to_multipoint) { rjt_data.reason = ELS_RJT_UNSUP; rjt_data.explan = ELS_EXPL_NONE; @@ -1041,8 +1031,11 @@ static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp, struct fc_els_ls_rjt *rjt; rjt = fc_frame_payload_get(fp, sizeof(*rjt)); - FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n", - rjt->er_reason, rjt->er_explan); + if (!rjt) + FC_RPORT_DBG(rdata, "PLOGI bad response\n"); + else + FC_RPORT_DBG(rdata, "PLOGI ELS rejected, reason %x expl %x\n", + rjt->er_reason, rjt->er_explan); fc_rport_error_retry(rdata, -FC_EX_ELS_RJT); } out: @@ -1071,9 +1064,6 @@ fc_rport_compatible_roles(struct fc_lport *lport, struct fc_rport_priv *rdata) * fc_rport_enter_plogi() - Send Port Login (PLOGI) request * @rdata: The remote port to send a PLOGI to * - * Locking Note: The rport lock is expected to be held before calling - * this routine. - * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) @@ -1081,6 +1071,8 @@ static void fc_rport_enter_plogi(struct fc_rport_priv *rdata) struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; + lockdep_assert_held(&rdata->rp_mutex); + if (!fc_rport_compatible_roles(lport, rdata)) { FC_RPORT_DBG(rdata, "PLOGI suppressed for incompatible role\n"); fc_rport_state_enter(rdata, RPORT_ST_PLOGI_WAIT); @@ -1162,12 +1154,15 @@ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, op = fc_frame_payload_op(fp); if (op == ELS_LS_ACC) { pp = fc_frame_payload_get(fp, sizeof(*pp)); - if (!pp) + if (!pp) { + fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); goto out; + } resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK); FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n", pp->spp.spp_flags, pp->spp.spp_type); + rdata->spp_type = pp->spp.spp_type; if (resp_code != FC_SPP_RESP_ACK) { if (resp_code == FC_SPP_RESP_CONF) @@ -1176,8 +1171,10 @@ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); goto out; } - if (pp->prli.prli_spp_len < sizeof(pp->spp)) + if (pp->prli.prli_spp_len < sizeof(pp->spp)) { + fc_rport_error_retry(rdata, -FC_EX_SEQ_ERR); goto out; + } fcp_parm = ntohl(pp->spp.spp_params); if (fcp_parm & FCP_SPPF_RETRY) @@ -1188,11 +1185,13 @@ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, /* * Call prli provider if we should act as a target */ - prov = fc_passive_prov[rdata->spp_type]; - if (prov) { - memset(&temp_spp, 0, sizeof(temp_spp)); - prov->prli(rdata, pp->prli.prli_spp_len, - &pp->spp, &temp_spp); + if (rdata->spp_type < FC_FC4_PROV_SIZE) { + prov = fc_passive_prov[rdata->spp_type]; + if (prov) { + memset(&temp_spp, 0, sizeof(temp_spp)); + prov->prli(rdata, pp->prli.prli_spp_len, + &pp->spp, &temp_spp); + } } /* * Check if the image pair could be established @@ -1215,8 +1214,17 @@ static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp, } else { rjt = fc_frame_payload_get(fp, sizeof(*rjt)); - FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n", - rjt->er_reason, rjt->er_explan); + if (!rjt) + FC_RPORT_DBG(rdata, "PRLI bad response\n"); + else { + FC_RPORT_DBG(rdata, "PRLI ELS rejected, reason %x expl %x\n", + rjt->er_reason, rjt->er_explan); + if (rjt->er_reason == ELS_RJT_UNAB && + rjt->er_explan == ELS_EXPL_PLOGI_REQD) { + fc_rport_enter_plogi(rdata); + goto out; + } + } fc_rport_error_retry(rdata, FC_EX_ELS_RJT); } @@ -1232,9 +1240,6 @@ put: * fc_rport_enter_prli() - Send Process Login (PRLI) request * @rdata: The remote port to send the PRLI request to * - * Locking Note: The rport lock is expected to be held before calling - * this routine. - * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_prli(struct fc_rport_priv *rdata) @@ -1247,6 +1252,8 @@ static void fc_rport_enter_prli(struct fc_rport_priv *rdata) struct fc_frame *fp; struct fc4_prov *prov; + lockdep_assert_held(&rdata->rp_mutex); + /* * If the rport is one of the well known addresses * we skip PRLI and RTV and go straight to READY. @@ -1372,9 +1379,6 @@ put: * fc_rport_enter_rtv() - Send Request Timeout Value (RTV) request * @rdata: The remote port to send the RTV request to * - * Locking Note: The rport lock is expected to be held before calling - * this routine. - * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) @@ -1382,6 +1386,8 @@ static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) struct fc_frame *fp; struct fc_lport *lport = rdata->local_port; + lockdep_assert_held(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Port entered RTV state from %s state\n", fc_rport_state(rdata)); @@ -1406,8 +1412,6 @@ static void fc_rport_enter_rtv(struct fc_rport_priv *rdata) * fc_rport_recv_rtv_req() - Handler for Read Timeout Value (RTV) requests * @rdata: The remote port that sent the RTV request * @in_fp: The RTV request frame - * - * Locking Note: Called with the lport and rport locks held. */ static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata, struct fc_frame *in_fp) @@ -1417,6 +1421,9 @@ static void fc_rport_recv_rtv_req(struct fc_rport_priv *rdata, struct fc_els_rtv_acc *rtv; struct fc_seq_els_data rjt_data; + lockdep_assert_held(&rdata->rp_mutex); + lockdep_assert_held(&lport->lp_mutex); + FC_RPORT_DBG(rdata, "Received RTV request\n"); fp = fc_frame_alloc(lport, sizeof(*rtv)); @@ -1441,7 +1448,7 @@ drop: * fc_rport_logo_resp() - Handler for logout (LOGO) responses * @sp: The sequence the LOGO was on * @fp: The LOGO response frame - * @lport_arg: The local port + * @rdata_arg: The remote port */ static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, void *rdata_arg) @@ -1460,9 +1467,6 @@ static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp, * fc_rport_enter_logo() - Send a logout (LOGO) request * @rdata: The remote port to send the LOGO request to * - * Locking Note: The rport lock is expected to be held before calling - * this routine. - * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_logo(struct fc_rport_priv *rdata) @@ -1470,6 +1474,8 @@ static void fc_rport_enter_logo(struct fc_rport_priv *rdata) struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; + lockdep_assert_held(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Port sending LOGO from %s state\n", fc_rport_state(rdata)); @@ -1483,7 +1489,7 @@ static void fc_rport_enter_logo(struct fc_rport_priv *rdata) } /** - * fc_rport_els_adisc_resp() - Handler for Address Discovery (ADISC) responses + * fc_rport_adisc_resp() - Handler for Address Discovery (ADISC) responses * @sp: The sequence the ADISC response was on * @fp: The ADISC response frame * @rdata_arg: The remote port that sent the ADISC response @@ -1548,9 +1554,6 @@ put: * fc_rport_enter_adisc() - Send Address Discover (ADISC) request * @rdata: The remote port to send the ADISC request to * - * Locking Note: The rport lock is expected to be held before calling - * this routine. - * * Reference counting: increments kref when sending ELS */ static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) @@ -1558,6 +1561,8 @@ static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) struct fc_lport *lport = rdata->local_port; struct fc_frame *fp; + lockdep_assert_held(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "sending ADISC from %s state\n", fc_rport_state(rdata)); @@ -1581,8 +1586,6 @@ static void fc_rport_enter_adisc(struct fc_rport_priv *rdata) * fc_rport_recv_adisc_req() - Handler for Address Discovery (ADISC) requests * @rdata: The remote port that sent the ADISC request * @in_fp: The ADISC request frame - * - * Locking Note: Called with the lport and rport locks held. */ static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, struct fc_frame *in_fp) @@ -1592,6 +1595,9 @@ static void fc_rport_recv_adisc_req(struct fc_rport_priv *rdata, struct fc_els_adisc *adisc; struct fc_seq_els_data rjt_data; + lockdep_assert_held(&rdata->rp_mutex); + lockdep_assert_held(&lport->lp_mutex); + FC_RPORT_DBG(rdata, "Received ADISC request\n"); adisc = fc_frame_payload_get(in_fp, sizeof(*adisc)); @@ -1618,9 +1624,6 @@ drop: * fc_rport_recv_rls_req() - Handle received Read Link Status request * @rdata: The remote port that sent the RLS request * @rx_fp: The PRLI request frame - * - * Locking Note: The rport lock is expected to be held before calling - * this function. */ static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, struct fc_frame *rx_fp) @@ -1634,6 +1637,8 @@ static void fc_rport_recv_rls_req(struct fc_rport_priv *rdata, struct fc_seq_els_data rjt_data; struct fc_host_statistics *hst; + lockdep_assert_held(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Received RLS request while in state %s\n", fc_rport_state(rdata)); @@ -1687,8 +1692,6 @@ out: * Handle incoming ELS requests that require port login. * The ELS opcode has already been validated by the caller. * - * Locking Note: Called with the lport lock held. - * * Reference counting: does not modify kref */ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) @@ -1696,6 +1699,8 @@ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) struct fc_rport_priv *rdata; struct fc_seq_els_data els_data; + lockdep_assert_held(&lport->lp_mutex); + rdata = fc_rport_lookup(lport, fc_frame_sid(fp)); if (!rdata) { FC_RPORT_ID_DBG(lport, fc_frame_sid(fp), @@ -1721,6 +1726,7 @@ static void fc_rport_recv_els_req(struct fc_lport *lport, struct fc_frame *fp) kref_put(&rdata->kref, fc_rport_destroy); goto busy; } + fallthrough; default: FC_RPORT_DBG(rdata, "Reject ELS 0x%02x while in state %s\n", @@ -1783,14 +1789,14 @@ busy: * @lport: The local port that received the request * @fp: The request frame * - * Locking Note: Called with the lport lock held. - * * Reference counting: does not modify kref */ void fc_rport_recv_req(struct fc_lport *lport, struct fc_frame *fp) { struct fc_seq_els_data els_data; + lockdep_assert_held(&lport->lp_mutex); + /* * Handle FLOGI, PLOGI and LOGO requests separately, since they * don't require prior login. @@ -1831,8 +1837,6 @@ EXPORT_SYMBOL(fc_rport_recv_req); * @lport: The local port that received the PLOGI request * @rx_fp: The PLOGI request frame * - * Locking Note: The rport lock is held before calling this function. - * * Reference counting: increments kref on return */ static void fc_rport_recv_plogi_req(struct fc_lport *lport, @@ -1845,6 +1849,8 @@ static void fc_rport_recv_plogi_req(struct fc_lport *lport, struct fc_seq_els_data rjt_data; u32 sid; + lockdep_assert_held(&lport->lp_mutex); + sid = fc_frame_sid(fp); FC_RPORT_ID_DBG(lport, sid, "Received PLOGI request\n"); @@ -1955,9 +1961,6 @@ reject: * fc_rport_recv_prli_req() - Handler for process login (PRLI) requests * @rdata: The remote port that sent the PRLI request * @rx_fp: The PRLI request frame - * - * Locking Note: The rport lock is expected to be held before calling - * this function. */ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, struct fc_frame *rx_fp) @@ -1976,6 +1979,8 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata, struct fc_seq_els_data rjt_data; struct fc4_prov *prov; + lockdep_assert_held(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n", fc_rport_state(rdata)); @@ -2072,9 +2077,6 @@ drop: * fc_rport_recv_prlo_req() - Handler for process logout (PRLO) requests * @rdata: The remote port that sent the PRLO request * @rx_fp: The PRLO request frame - * - * Locking Note: The rport lock is expected to be held before calling - * this function. */ static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, struct fc_frame *rx_fp) @@ -2091,6 +2093,8 @@ static void fc_rport_recv_prlo_req(struct fc_rport_priv *rdata, unsigned int plen; struct fc_seq_els_data rjt_data; + lockdep_assert_held(&rdata->rp_mutex); + FC_RPORT_DBG(rdata, "Received PRLO request while in state %s\n", fc_rport_state(rdata)); @@ -2144,9 +2148,6 @@ drop: * @lport: The local port that received the LOGO request * @fp: The LOGO request frame * - * Locking Note: The rport lock is expected to be held before calling - * this function. - * * Reference counting: drops kref on return */ static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) @@ -2154,6 +2155,8 @@ static void fc_rport_recv_logo_req(struct fc_lport *lport, struct fc_frame *fp) struct fc_rport_priv *rdata; u32 sid; + lockdep_assert_held(&lport->lp_mutex); + fc_seq_els_rsp_send(fp, ELS_LS_ACC, NULL); sid = fc_frame_sid(fp); @@ -2260,7 +2263,8 @@ struct fc4_prov fc_rport_t0_prov = { */ int fc_setup_rport(void) { - rport_event_queue = create_singlethread_workqueue("fc_rport_eq"); + rport_event_queue = + alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM, "fc_rport_eq"); if (!rport_event_queue) return -ENOMEM; return 0; |