![Joe Eykholt](/assets/img/avatar_default.png)
Add functions to fill in an FC header given a request header. These reduces code lines in fc_lport and fc_rport and works without an exchange/sequence assigned. fc_fill_reply_hdr() fills a header for a final reply frame. fc_fill_hdr() which is similar but allows specifying the f_ctl parameter. Add defines for F_CTL values FC_FCTL_REQ and FC_FCTL_RESP. These can be used for most request and response sequences. v2 of patch adds a line to copy the frame encapsulation info from the received frame. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2265 lines
58 KiB
C
2265 lines
58 KiB
C
/*
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* Copyright(c) 2007 Intel Corporation. All rights reserved.
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* Copyright(c) 2008 Red Hat, Inc. All rights reserved.
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* Copyright(c) 2008 Mike Christie
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Maintained at www.Open-FCoE.org
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/scatterlist.h>
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#include <linux/err.h>
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#include <linux/crc32.h>
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#include <linux/slab.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/fc/fc_fc2.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_encode.h>
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#include "fc_libfc.h"
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struct kmem_cache *scsi_pkt_cachep;
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/* SRB state definitions */
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#define FC_SRB_FREE 0 /* cmd is free */
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#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
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#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
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#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
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#define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
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#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
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#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
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#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
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#define FC_SRB_READ (1 << 1)
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#define FC_SRB_WRITE (1 << 0)
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/*
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* The SCp.ptr should be tested and set under the host lock. NULL indicates
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* that the command has been retruned to the scsi layer.
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*/
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#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
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#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
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#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
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#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
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#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
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/**
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* struct fc_fcp_internal - FCP layer internal data
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* @scsi_pkt_pool: Memory pool to draw FCP packets from
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* @scsi_queue_lock: Protects the scsi_pkt_queue
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* @scsi_pkt_queue: Current FCP packets
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* @last_can_queue_ramp_down_time: ramp down time
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* @last_can_queue_ramp_up_time: ramp up time
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* @max_can_queue: max can_queue size
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*/
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struct fc_fcp_internal {
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mempool_t *scsi_pkt_pool;
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spinlock_t scsi_queue_lock;
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struct list_head scsi_pkt_queue;
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unsigned long last_can_queue_ramp_down_time;
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unsigned long last_can_queue_ramp_up_time;
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int max_can_queue;
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};
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#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
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/*
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* function prototypes
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* FC scsi I/O related functions
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*/
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static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
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static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
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static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
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static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
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static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
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static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
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static void fc_fcp_recovery(struct fc_fcp_pkt *);
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static void fc_fcp_timeout(unsigned long);
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static void fc_fcp_rec(struct fc_fcp_pkt *);
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static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
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static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
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static void fc_io_compl(struct fc_fcp_pkt *);
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static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
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static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
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static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
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/*
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* command status codes
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*/
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#define FC_COMPLETE 0
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#define FC_CMD_ABORTED 1
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#define FC_CMD_RESET 2
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#define FC_CMD_PLOGO 3
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#define FC_SNS_RCV 4
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#define FC_TRANS_ERR 5
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#define FC_DATA_OVRRUN 6
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#define FC_DATA_UNDRUN 7
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#define FC_ERROR 8
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#define FC_HRD_ERROR 9
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#define FC_CMD_RECOVERY 10
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/*
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* Error recovery timeout values.
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*/
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#define FC_SCSI_ER_TIMEOUT (10 * HZ)
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#define FC_SCSI_TM_TOV (10 * HZ)
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#define FC_SCSI_REC_TOV (2 * HZ)
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#define FC_HOST_RESET_TIMEOUT (30 * HZ)
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#define FC_CAN_QUEUE_PERIOD (60 * HZ)
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#define FC_MAX_ERROR_CNT 5
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#define FC_MAX_RECOV_RETRY 3
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#define FC_FCP_DFLT_QUEUE_DEPTH 32
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/**
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* fc_fcp_pkt_alloc() - Allocate a fcp_pkt
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* @lport: The local port that the FCP packet is for
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* @gfp: GFP flags for allocation
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*
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* Return value: fcp_pkt structure or null on allocation failure.
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* Context: Can be called from process context, no lock is required.
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*/
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static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
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{
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struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
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struct fc_fcp_pkt *fsp;
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fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
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if (fsp) {
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memset(fsp, 0, sizeof(*fsp));
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fsp->lp = lport;
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atomic_set(&fsp->ref_cnt, 1);
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init_timer(&fsp->timer);
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INIT_LIST_HEAD(&fsp->list);
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spin_lock_init(&fsp->scsi_pkt_lock);
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}
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return fsp;
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}
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/**
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* fc_fcp_pkt_release() - Release hold on a fcp_pkt
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* @fsp: The FCP packet to be released
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*
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* Context: Can be called from process or interrupt context,
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* no lock is required.
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*/
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static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
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{
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if (atomic_dec_and_test(&fsp->ref_cnt)) {
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struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
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mempool_free(fsp, si->scsi_pkt_pool);
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}
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}
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/**
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* fc_fcp_pkt_hold() - Hold a fcp_pkt
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* @fsp: The FCP packet to be held
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*/
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static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
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{
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atomic_inc(&fsp->ref_cnt);
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}
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/**
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* fc_fcp_pkt_destory() - Release hold on a fcp_pkt
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* @seq: The sequence that the FCP packet is on (required by destructor API)
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* @fsp: The FCP packet to be released
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*
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* This routine is called by a destructor callback in the exch_seq_send()
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* routine of the libfc Transport Template. The 'struct fc_seq' is a required
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* argument even though it is not used by this routine.
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*
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* Context: No locking required.
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*/
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static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
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{
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fc_fcp_pkt_release(fsp);
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}
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/**
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* fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
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* @fsp: The FCP packet to be locked and incremented
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*
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* We should only return error if we return a command to SCSI-ml before
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* getting a response. This can happen in cases where we send a abort, but
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* do not wait for the response and the abort and command can be passing
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* each other on the wire/network-layer.
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*
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* Note: this function locks the packet and gets a reference to allow
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* callers to call the completion function while the lock is held and
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* not have to worry about the packets refcount.
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*
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* TODO: Maybe we should just have callers grab/release the lock and
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* have a function that they call to verify the fsp and grab a ref if
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* needed.
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*/
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static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
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{
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spin_lock_bh(&fsp->scsi_pkt_lock);
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if (fsp->state & FC_SRB_COMPL) {
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spin_unlock_bh(&fsp->scsi_pkt_lock);
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return -EPERM;
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}
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fc_fcp_pkt_hold(fsp);
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return 0;
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}
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/**
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* fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
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* reference count
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* @fsp: The FCP packet to be unlocked and decremented
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*/
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static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
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{
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spin_unlock_bh(&fsp->scsi_pkt_lock);
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fc_fcp_pkt_release(fsp);
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}
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/**
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* fc_fcp_timer_set() - Start a timer for a fcp_pkt
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* @fsp: The FCP packet to start a timer for
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* @delay: The timeout period for the timer
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*/
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static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
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{
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if (!(fsp->state & FC_SRB_COMPL))
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mod_timer(&fsp->timer, jiffies + delay);
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}
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/**
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* fc_fcp_send_abort() - Send an abort for exchanges associated with a
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* fcp_pkt
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* @fsp: The FCP packet to abort exchanges on
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*/
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static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
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{
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if (!fsp->seq_ptr)
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return -EINVAL;
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fsp->state |= FC_SRB_ABORT_PENDING;
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return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
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}
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/**
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* fc_fcp_retry_cmd() - Retry a fcp_pkt
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* @fsp: The FCP packet to be retried
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*
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* Sets the status code to be FC_ERROR and then calls
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* fc_fcp_complete_locked() which in turn calls fc_io_compl().
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* fc_io_compl() will notify the SCSI-ml that the I/O is done.
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* The SCSI-ml will retry the command.
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*/
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static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
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{
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if (fsp->seq_ptr) {
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fsp->lp->tt.exch_done(fsp->seq_ptr);
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fsp->seq_ptr = NULL;
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}
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fsp->state &= ~FC_SRB_ABORT_PENDING;
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fsp->io_status = 0;
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fsp->status_code = FC_ERROR;
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fc_fcp_complete_locked(fsp);
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}
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/**
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* fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
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* @fsp: The FCP packet that will manage the DDP frames
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* @xid: The XID that will be used for the DDP exchange
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*/
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void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
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{
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struct fc_lport *lport;
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lport = fsp->lp;
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if ((fsp->req_flags & FC_SRB_READ) &&
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(lport->lro_enabled) && (lport->tt.ddp_setup)) {
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if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
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scsi_sg_count(fsp->cmd)))
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fsp->xfer_ddp = xid;
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}
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}
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/**
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* fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
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* DDP related resources for a fcp_pkt
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* @fsp: The FCP packet that DDP had been used on
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*/
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static void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
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{
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struct fc_lport *lport;
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if (!fsp)
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return;
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if (fsp->xfer_ddp == FC_XID_UNKNOWN)
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return;
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lport = fsp->lp;
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if (lport->tt.ddp_done) {
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fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
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fsp->xfer_ddp = FC_XID_UNKNOWN;
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}
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}
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/**
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* fc_fcp_can_queue_ramp_up() - increases can_queue
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* @lport: lport to ramp up can_queue
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*
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* Locking notes: Called with Scsi_Host lock held
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*/
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static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
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{
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struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
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int can_queue;
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if (si->last_can_queue_ramp_up_time &&
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(time_before(jiffies, si->last_can_queue_ramp_up_time +
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FC_CAN_QUEUE_PERIOD)))
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return;
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if (time_before(jiffies, si->last_can_queue_ramp_down_time +
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FC_CAN_QUEUE_PERIOD))
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return;
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si->last_can_queue_ramp_up_time = jiffies;
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can_queue = lport->host->can_queue << 1;
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if (can_queue >= si->max_can_queue) {
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can_queue = si->max_can_queue;
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si->last_can_queue_ramp_down_time = 0;
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}
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lport->host->can_queue = can_queue;
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shost_printk(KERN_ERR, lport->host, "libfc: increased "
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"can_queue to %d.\n", can_queue);
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}
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/**
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* fc_fcp_can_queue_ramp_down() - reduces can_queue
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* @lport: lport to reduce can_queue
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*
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* If we are getting memory allocation failures, then we may
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* be trying to execute too many commands. We let the running
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* commands complete or timeout, then try again with a reduced
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* can_queue. Eventually we will hit the point where we run
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* on all reserved structs.
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*
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* Locking notes: Called with Scsi_Host lock held
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*/
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static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
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{
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struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
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int can_queue;
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if (si->last_can_queue_ramp_down_time &&
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(time_before(jiffies, si->last_can_queue_ramp_down_time +
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FC_CAN_QUEUE_PERIOD)))
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return;
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si->last_can_queue_ramp_down_time = jiffies;
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can_queue = lport->host->can_queue;
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can_queue >>= 1;
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if (!can_queue)
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can_queue = 1;
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lport->host->can_queue = can_queue;
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shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
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"Reducing can_queue to %d.\n", can_queue);
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}
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/*
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* fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
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* @lport: fc lport struct
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* @len: payload length
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*
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* Allocates fc_frame structure and buffer but if fails to allocate
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* then reduce can_queue.
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*/
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static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
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size_t len)
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{
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struct fc_frame *fp;
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unsigned long flags;
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fp = fc_frame_alloc(lport, len);
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if (likely(fp))
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return fp;
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/* error case */
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spin_lock_irqsave(lport->host->host_lock, flags);
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fc_fcp_can_queue_ramp_down(lport);
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spin_unlock_irqrestore(lport->host->host_lock, flags);
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return NULL;
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}
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/**
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* fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
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* @fsp: The FCP packet the data is on
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* @fp: The data frame
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*/
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static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
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{
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struct scsi_cmnd *sc = fsp->cmd;
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struct fc_lport *lport = fsp->lp;
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struct fcoe_dev_stats *stats;
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struct fc_frame_header *fh;
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size_t start_offset;
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size_t offset;
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u32 crc;
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u32 copy_len = 0;
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size_t len;
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void *buf;
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struct scatterlist *sg;
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|
u32 nents;
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
offset = ntohl(fh->fh_parm_offset);
|
|
start_offset = offset;
|
|
len = fr_len(fp) - sizeof(*fh);
|
|
buf = fc_frame_payload_get(fp, 0);
|
|
|
|
/*
|
|
* if this I/O is ddped then clear it
|
|
* and initiate recovery since data
|
|
* frames are expected to be placed
|
|
* directly in that case.
|
|
*/
|
|
if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
|
|
fc_fcp_ddp_done(fsp);
|
|
goto err;
|
|
}
|
|
if (offset + len > fsp->data_len) {
|
|
/* this should never happen */
|
|
if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
|
|
fc_frame_crc_check(fp))
|
|
goto crc_err;
|
|
FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
|
|
"data_len %x\n", len, offset, fsp->data_len);
|
|
goto err;
|
|
}
|
|
if (offset != fsp->xfer_len)
|
|
fsp->state |= FC_SRB_DISCONTIG;
|
|
|
|
sg = scsi_sglist(sc);
|
|
nents = scsi_sg_count(sc);
|
|
|
|
if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
|
|
copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
|
|
&offset, KM_SOFTIRQ0, NULL);
|
|
} else {
|
|
crc = crc32(~0, (u8 *) fh, sizeof(*fh));
|
|
copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
|
|
&offset, KM_SOFTIRQ0, &crc);
|
|
buf = fc_frame_payload_get(fp, 0);
|
|
if (len % 4)
|
|
crc = crc32(crc, buf + len, 4 - (len % 4));
|
|
|
|
if (~crc != le32_to_cpu(fr_crc(fp))) {
|
|
crc_err:
|
|
stats = per_cpu_ptr(lport->dev_stats, get_cpu());
|
|
stats->ErrorFrames++;
|
|
/* per cpu count, not total count, but OK for limit */
|
|
if (stats->InvalidCRCCount++ < 5)
|
|
printk(KERN_WARNING "libfc: CRC error on data "
|
|
"frame for port (%6.6x)\n",
|
|
lport->port_id);
|
|
put_cpu();
|
|
/*
|
|
* Assume the frame is total garbage.
|
|
* We may have copied it over the good part
|
|
* of the buffer.
|
|
* If so, we need to retry the entire operation.
|
|
* Otherwise, ignore it.
|
|
*/
|
|
if (fsp->state & FC_SRB_DISCONTIG)
|
|
goto err;
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (fsp->xfer_contig_end == start_offset)
|
|
fsp->xfer_contig_end += copy_len;
|
|
fsp->xfer_len += copy_len;
|
|
|
|
/*
|
|
* In the very rare event that this data arrived after the response
|
|
* and completes the transfer, call the completion handler.
|
|
*/
|
|
if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
|
|
fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
|
|
fc_fcp_complete_locked(fsp);
|
|
return;
|
|
err:
|
|
fc_fcp_recovery(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_send_data() - Send SCSI data to a target
|
|
* @fsp: The FCP packet the data is on
|
|
* @sp: The sequence the data is to be sent on
|
|
* @offset: The starting offset for this data request
|
|
* @seq_blen: The burst length for this data request
|
|
*
|
|
* Called after receiving a Transfer Ready data descriptor.
|
|
* If the LLD is capable of sequence offload then send down the
|
|
* seq_blen amount of data in single frame, otherwise send
|
|
* multiple frames of the maximum frame payload supported by
|
|
* the target port.
|
|
*/
|
|
static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
|
|
size_t offset, size_t seq_blen)
|
|
{
|
|
struct fc_exch *ep;
|
|
struct scsi_cmnd *sc;
|
|
struct scatterlist *sg;
|
|
struct fc_frame *fp = NULL;
|
|
struct fc_lport *lport = fsp->lp;
|
|
struct page *page;
|
|
size_t remaining;
|
|
size_t t_blen;
|
|
size_t tlen;
|
|
size_t sg_bytes;
|
|
size_t frame_offset, fh_parm_offset;
|
|
size_t off;
|
|
int error;
|
|
void *data = NULL;
|
|
void *page_addr;
|
|
int using_sg = lport->sg_supp;
|
|
u32 f_ctl;
|
|
|
|
WARN_ON(seq_blen <= 0);
|
|
if (unlikely(offset + seq_blen > fsp->data_len)) {
|
|
/* this should never happen */
|
|
FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
|
|
"offset %zx\n", seq_blen, offset);
|
|
fc_fcp_send_abort(fsp);
|
|
return 0;
|
|
} else if (offset != fsp->xfer_len) {
|
|
/* Out of Order Data Request - no problem, but unexpected. */
|
|
FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
|
|
"seq_blen %zx offset %zx\n", seq_blen, offset);
|
|
}
|
|
|
|
/*
|
|
* if LLD is capable of seq_offload then set transport
|
|
* burst length (t_blen) to seq_blen, otherwise set t_blen
|
|
* to max FC frame payload previously set in fsp->max_payload.
|
|
*/
|
|
t_blen = fsp->max_payload;
|
|
if (lport->seq_offload) {
|
|
t_blen = min(seq_blen, (size_t)lport->lso_max);
|
|
FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
|
|
fsp, seq_blen, lport->lso_max, t_blen);
|
|
}
|
|
|
|
if (t_blen > 512)
|
|
t_blen &= ~(512 - 1); /* round down to block size */
|
|
sc = fsp->cmd;
|
|
|
|
remaining = seq_blen;
|
|
fh_parm_offset = frame_offset = offset;
|
|
tlen = 0;
|
|
seq = lport->tt.seq_start_next(seq);
|
|
f_ctl = FC_FC_REL_OFF;
|
|
WARN_ON(!seq);
|
|
|
|
sg = scsi_sglist(sc);
|
|
|
|
while (remaining > 0 && sg) {
|
|
if (offset >= sg->length) {
|
|
offset -= sg->length;
|
|
sg = sg_next(sg);
|
|
continue;
|
|
}
|
|
if (!fp) {
|
|
tlen = min(t_blen, remaining);
|
|
|
|
/*
|
|
* TODO. Temporary workaround. fc_seq_send() can't
|
|
* handle odd lengths in non-linear skbs.
|
|
* This will be the final fragment only.
|
|
*/
|
|
if (tlen % 4)
|
|
using_sg = 0;
|
|
fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
|
|
if (!fp)
|
|
return -ENOMEM;
|
|
|
|
data = fc_frame_header_get(fp) + 1;
|
|
fh_parm_offset = frame_offset;
|
|
fr_max_payload(fp) = fsp->max_payload;
|
|
}
|
|
|
|
off = offset + sg->offset;
|
|
sg_bytes = min(tlen, sg->length - offset);
|
|
sg_bytes = min(sg_bytes,
|
|
(size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
|
|
page = sg_page(sg) + (off >> PAGE_SHIFT);
|
|
if (using_sg) {
|
|
get_page(page);
|
|
skb_fill_page_desc(fp_skb(fp),
|
|
skb_shinfo(fp_skb(fp))->nr_frags,
|
|
page, off & ~PAGE_MASK, sg_bytes);
|
|
fp_skb(fp)->data_len += sg_bytes;
|
|
fr_len(fp) += sg_bytes;
|
|
fp_skb(fp)->truesize += PAGE_SIZE;
|
|
} else {
|
|
/*
|
|
* The scatterlist item may be bigger than PAGE_SIZE,
|
|
* but we must not cross pages inside the kmap.
|
|
*/
|
|
page_addr = kmap_atomic(page, KM_SOFTIRQ0);
|
|
memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
|
|
sg_bytes);
|
|
kunmap_atomic(page_addr, KM_SOFTIRQ0);
|
|
data += sg_bytes;
|
|
}
|
|
offset += sg_bytes;
|
|
frame_offset += sg_bytes;
|
|
tlen -= sg_bytes;
|
|
remaining -= sg_bytes;
|
|
|
|
if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
|
|
(tlen))
|
|
continue;
|
|
|
|
/*
|
|
* Send sequence with transfer sequence initiative in case
|
|
* this is last FCP frame of the sequence.
|
|
*/
|
|
if (remaining == 0)
|
|
f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
|
|
|
|
ep = fc_seq_exch(seq);
|
|
fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
|
|
FC_TYPE_FCP, f_ctl, fh_parm_offset);
|
|
|
|
/*
|
|
* send fragment using for a sequence.
|
|
*/
|
|
error = lport->tt.seq_send(lport, seq, fp);
|
|
if (error) {
|
|
WARN_ON(1); /* send error should be rare */
|
|
fc_fcp_retry_cmd(fsp);
|
|
return 0;
|
|
}
|
|
fp = NULL;
|
|
}
|
|
fsp->xfer_len += seq_blen; /* premature count? */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_abts_resp() - Send an ABTS response
|
|
* @fsp: The FCP packet that is being aborted
|
|
* @fp: The response frame
|
|
*/
|
|
static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
|
|
{
|
|
int ba_done = 1;
|
|
struct fc_ba_rjt *brp;
|
|
struct fc_frame_header *fh;
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
switch (fh->fh_r_ctl) {
|
|
case FC_RCTL_BA_ACC:
|
|
break;
|
|
case FC_RCTL_BA_RJT:
|
|
brp = fc_frame_payload_get(fp, sizeof(*brp));
|
|
if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
|
|
break;
|
|
/* fall thru */
|
|
default:
|
|
/*
|
|
* we will let the command timeout
|
|
* and scsi-ml recover in this case,
|
|
* therefore cleared the ba_done flag.
|
|
*/
|
|
ba_done = 0;
|
|
}
|
|
|
|
if (ba_done) {
|
|
fsp->state |= FC_SRB_ABORTED;
|
|
fsp->state &= ~FC_SRB_ABORT_PENDING;
|
|
|
|
if (fsp->wait_for_comp)
|
|
complete(&fsp->tm_done);
|
|
else
|
|
fc_fcp_complete_locked(fsp);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_recv() - Reveive an FCP frame
|
|
* @seq: The sequence the frame is on
|
|
* @fp: The received frame
|
|
* @arg: The related FCP packet
|
|
*
|
|
* Context: Called from Soft IRQ context. Can not be called
|
|
* holding the FCP packet list lock.
|
|
*/
|
|
static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
|
|
{
|
|
struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
|
|
struct fc_lport *lport = fsp->lp;
|
|
struct fc_frame_header *fh;
|
|
struct fcp_txrdy *dd;
|
|
u8 r_ctl;
|
|
int rc = 0;
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_fcp_error(fsp, fp);
|
|
return;
|
|
}
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
r_ctl = fh->fh_r_ctl;
|
|
|
|
if (lport->state != LPORT_ST_READY)
|
|
goto out;
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
goto out;
|
|
fsp->last_pkt_time = jiffies;
|
|
|
|
if (fh->fh_type == FC_TYPE_BLS) {
|
|
fc_fcp_abts_resp(fsp, fp);
|
|
goto unlock;
|
|
}
|
|
|
|
if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
|
|
goto unlock;
|
|
|
|
if (r_ctl == FC_RCTL_DD_DATA_DESC) {
|
|
/*
|
|
* received XFER RDY from the target
|
|
* need to send data to the target
|
|
*/
|
|
WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
|
|
dd = fc_frame_payload_get(fp, sizeof(*dd));
|
|
WARN_ON(!dd);
|
|
|
|
rc = fc_fcp_send_data(fsp, seq,
|
|
(size_t) ntohl(dd->ft_data_ro),
|
|
(size_t) ntohl(dd->ft_burst_len));
|
|
if (!rc)
|
|
seq->rec_data = fsp->xfer_len;
|
|
} else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
|
|
/*
|
|
* received a DATA frame
|
|
* next we will copy the data to the system buffer
|
|
*/
|
|
WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
|
|
fc_fcp_recv_data(fsp, fp);
|
|
seq->rec_data = fsp->xfer_contig_end;
|
|
} else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
|
|
WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
|
|
|
|
fc_fcp_resp(fsp, fp);
|
|
} else {
|
|
FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
|
|
}
|
|
unlock:
|
|
fc_fcp_unlock_pkt(fsp);
|
|
out:
|
|
fc_frame_free(fp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_resp() - Handler for FCP responses
|
|
* @fsp: The FCP packet the response is for
|
|
* @fp: The response frame
|
|
*/
|
|
static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
|
|
{
|
|
struct fc_frame_header *fh;
|
|
struct fcp_resp *fc_rp;
|
|
struct fcp_resp_ext *rp_ex;
|
|
struct fcp_resp_rsp_info *fc_rp_info;
|
|
u32 plen;
|
|
u32 expected_len;
|
|
u32 respl = 0;
|
|
u32 snsl = 0;
|
|
u8 flags = 0;
|
|
|
|
plen = fr_len(fp);
|
|
fh = (struct fc_frame_header *)fr_hdr(fp);
|
|
if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
|
|
goto len_err;
|
|
plen -= sizeof(*fh);
|
|
fc_rp = (struct fcp_resp *)(fh + 1);
|
|
fsp->cdb_status = fc_rp->fr_status;
|
|
flags = fc_rp->fr_flags;
|
|
fsp->scsi_comp_flags = flags;
|
|
expected_len = fsp->data_len;
|
|
|
|
/* if ddp, update xfer len */
|
|
fc_fcp_ddp_done(fsp);
|
|
|
|
if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
|
|
rp_ex = (void *)(fc_rp + 1);
|
|
if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
|
|
if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
|
|
goto len_err;
|
|
fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
|
|
if (flags & FCP_RSP_LEN_VAL) {
|
|
respl = ntohl(rp_ex->fr_rsp_len);
|
|
if (respl != sizeof(*fc_rp_info))
|
|
goto len_err;
|
|
if (fsp->wait_for_comp) {
|
|
/* Abuse cdb_status for rsp code */
|
|
fsp->cdb_status = fc_rp_info->rsp_code;
|
|
complete(&fsp->tm_done);
|
|
/*
|
|
* tmfs will not have any scsi cmd so
|
|
* exit here
|
|
*/
|
|
return;
|
|
}
|
|
}
|
|
if (flags & FCP_SNS_LEN_VAL) {
|
|
snsl = ntohl(rp_ex->fr_sns_len);
|
|
if (snsl > SCSI_SENSE_BUFFERSIZE)
|
|
snsl = SCSI_SENSE_BUFFERSIZE;
|
|
memcpy(fsp->cmd->sense_buffer,
|
|
(char *)fc_rp_info + respl, snsl);
|
|
}
|
|
}
|
|
if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
|
|
if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
|
|
goto len_err;
|
|
if (flags & FCP_RESID_UNDER) {
|
|
fsp->scsi_resid = ntohl(rp_ex->fr_resid);
|
|
/*
|
|
* The cmnd->underflow is the minimum number of
|
|
* bytes that must be transfered for this
|
|
* command. Provided a sense condition is not
|
|
* present, make sure the actual amount
|
|
* transferred is at least the underflow value
|
|
* or fail.
|
|
*/
|
|
if (!(flags & FCP_SNS_LEN_VAL) &&
|
|
(fc_rp->fr_status == 0) &&
|
|
(scsi_bufflen(fsp->cmd) -
|
|
fsp->scsi_resid) < fsp->cmd->underflow)
|
|
goto err;
|
|
expected_len -= fsp->scsi_resid;
|
|
} else {
|
|
fsp->status_code = FC_ERROR;
|
|
}
|
|
}
|
|
}
|
|
fsp->state |= FC_SRB_RCV_STATUS;
|
|
|
|
/*
|
|
* Check for missing or extra data frames.
|
|
*/
|
|
if (unlikely(fsp->xfer_len != expected_len)) {
|
|
if (fsp->xfer_len < expected_len) {
|
|
/*
|
|
* Some data may be queued locally,
|
|
* Wait a at least one jiffy to see if it is delivered.
|
|
* If this expires without data, we may do SRR.
|
|
*/
|
|
fc_fcp_timer_set(fsp, 2);
|
|
return;
|
|
}
|
|
fsp->status_code = FC_DATA_OVRRUN;
|
|
FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
|
|
"len %x, data len %x\n",
|
|
fsp->rport->port_id,
|
|
fsp->xfer_len, expected_len, fsp->data_len);
|
|
}
|
|
fc_fcp_complete_locked(fsp);
|
|
return;
|
|
|
|
len_err:
|
|
FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
|
|
"snsl %u\n", flags, fr_len(fp), respl, snsl);
|
|
err:
|
|
fsp->status_code = FC_ERROR;
|
|
fc_fcp_complete_locked(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
|
|
* fcp_pkt lock held
|
|
* @fsp: The FCP packet to be completed
|
|
*
|
|
* This function may sleep if a timer is pending. The packet lock must be
|
|
* held, and the host lock must not be held.
|
|
*/
|
|
static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
|
|
{
|
|
struct fc_lport *lport = fsp->lp;
|
|
struct fc_seq *seq;
|
|
struct fc_exch *ep;
|
|
u32 f_ctl;
|
|
|
|
if (fsp->state & FC_SRB_ABORT_PENDING)
|
|
return;
|
|
|
|
if (fsp->state & FC_SRB_ABORTED) {
|
|
if (!fsp->status_code)
|
|
fsp->status_code = FC_CMD_ABORTED;
|
|
} else {
|
|
/*
|
|
* Test for transport underrun, independent of response
|
|
* underrun status.
|
|
*/
|
|
if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
|
|
(!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
|
|
fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
|
|
fsp->status_code = FC_DATA_UNDRUN;
|
|
fsp->io_status = 0;
|
|
}
|
|
}
|
|
|
|
seq = fsp->seq_ptr;
|
|
if (seq) {
|
|
fsp->seq_ptr = NULL;
|
|
if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
|
|
struct fc_frame *conf_frame;
|
|
struct fc_seq *csp;
|
|
|
|
csp = lport->tt.seq_start_next(seq);
|
|
conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
|
|
if (conf_frame) {
|
|
f_ctl = FC_FC_SEQ_INIT;
|
|
f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
|
|
ep = fc_seq_exch(seq);
|
|
fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
|
|
ep->did, ep->sid,
|
|
FC_TYPE_FCP, f_ctl, 0);
|
|
lport->tt.seq_send(lport, csp, conf_frame);
|
|
}
|
|
}
|
|
lport->tt.exch_done(seq);
|
|
}
|
|
fc_io_compl(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
|
|
* @fsp: The FCP packet whose exchanges should be canceled
|
|
* @error: The reason for the cancellation
|
|
*/
|
|
static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
|
|
{
|
|
struct fc_lport *lport = fsp->lp;
|
|
|
|
if (fsp->seq_ptr) {
|
|
lport->tt.exch_done(fsp->seq_ptr);
|
|
fsp->seq_ptr = NULL;
|
|
}
|
|
fsp->status_code = error;
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
|
|
* @lport: The local port whose exchanges should be canceled
|
|
* @id: The target's ID
|
|
* @lun: The LUN
|
|
* @error: The reason for cancellation
|
|
*
|
|
* If lun or id is -1, they are ignored.
|
|
*/
|
|
static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
|
|
unsigned int lun, int error)
|
|
{
|
|
struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
|
|
struct fc_fcp_pkt *fsp;
|
|
struct scsi_cmnd *sc_cmd;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&si->scsi_queue_lock, flags);
|
|
restart:
|
|
list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
|
|
sc_cmd = fsp->cmd;
|
|
if (id != -1 && scmd_id(sc_cmd) != id)
|
|
continue;
|
|
|
|
if (lun != -1 && sc_cmd->device->lun != lun)
|
|
continue;
|
|
|
|
fc_fcp_pkt_hold(fsp);
|
|
spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
|
|
|
|
if (!fc_fcp_lock_pkt(fsp)) {
|
|
fc_fcp_cleanup_cmd(fsp, error);
|
|
fc_io_compl(fsp);
|
|
fc_fcp_unlock_pkt(fsp);
|
|
}
|
|
|
|
fc_fcp_pkt_release(fsp);
|
|
spin_lock_irqsave(&si->scsi_queue_lock, flags);
|
|
/*
|
|
* while we dropped the lock multiple pkts could
|
|
* have been released, so we have to start over.
|
|
*/
|
|
goto restart;
|
|
}
|
|
spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
|
|
* @lport: The local port whose exchanges are to be aborted
|
|
*/
|
|
static void fc_fcp_abort_io(struct fc_lport *lport)
|
|
{
|
|
fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_pkt_send() - Send a fcp_pkt
|
|
* @lport: The local port to send the FCP packet on
|
|
* @fsp: The FCP packet to send
|
|
*
|
|
* Return: Zero for success and -1 for failure
|
|
* Locks: Called without locks held
|
|
*/
|
|
static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
|
|
{
|
|
struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
fsp->cmd->SCp.ptr = (char *)fsp;
|
|
fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
|
|
fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
|
|
|
|
int_to_scsilun(fsp->cmd->device->lun,
|
|
(struct scsi_lun *)fsp->cdb_cmd.fc_lun);
|
|
memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
|
|
|
|
spin_lock_irqsave(&si->scsi_queue_lock, flags);
|
|
list_add_tail(&fsp->list, &si->scsi_pkt_queue);
|
|
spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
|
|
rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
|
|
if (unlikely(rc)) {
|
|
spin_lock_irqsave(&si->scsi_queue_lock, flags);
|
|
list_del(&fsp->list);
|
|
spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_cmd_send() - Send a FCP command
|
|
* @lport: The local port to send the command on
|
|
* @fsp: The FCP packet the command is on
|
|
* @resp: The handler for the response
|
|
*/
|
|
static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
|
|
void (*resp)(struct fc_seq *,
|
|
struct fc_frame *fp,
|
|
void *arg))
|
|
{
|
|
struct fc_frame *fp;
|
|
struct fc_seq *seq;
|
|
struct fc_rport *rport;
|
|
struct fc_rport_libfc_priv *rpriv;
|
|
const size_t len = sizeof(fsp->cdb_cmd);
|
|
int rc = 0;
|
|
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
return 0;
|
|
|
|
fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
|
|
if (!fp) {
|
|
rc = -1;
|
|
goto unlock;
|
|
}
|
|
|
|
memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
|
|
fr_fsp(fp) = fsp;
|
|
rport = fsp->rport;
|
|
fsp->max_payload = rport->maxframe_size;
|
|
rpriv = rport->dd_data;
|
|
|
|
fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
|
|
rpriv->local_port->port_id, FC_TYPE_FCP,
|
|
FC_FCTL_REQ, 0);
|
|
|
|
seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
|
|
fsp, 0);
|
|
if (!seq) {
|
|
rc = -1;
|
|
goto unlock;
|
|
}
|
|
fsp->last_pkt_time = jiffies;
|
|
fsp->seq_ptr = seq;
|
|
fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
|
|
|
|
setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
|
|
fc_fcp_timer_set(fsp,
|
|
(fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
|
|
FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
|
|
unlock:
|
|
fc_fcp_unlock_pkt(fsp);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_error() - Handler for FCP layer errors
|
|
* @fsp: The FCP packet the error is on
|
|
* @fp: The frame that has errored
|
|
*/
|
|
static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
|
|
{
|
|
int error = PTR_ERR(fp);
|
|
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
return;
|
|
|
|
if (error == -FC_EX_CLOSED) {
|
|
fc_fcp_retry_cmd(fsp);
|
|
goto unlock;
|
|
}
|
|
|
|
/*
|
|
* clear abort pending, because the lower layer
|
|
* decided to force completion.
|
|
*/
|
|
fsp->state &= ~FC_SRB_ABORT_PENDING;
|
|
fsp->status_code = FC_CMD_PLOGO;
|
|
fc_fcp_complete_locked(fsp);
|
|
unlock:
|
|
fc_fcp_unlock_pkt(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_pkt_abort() - Abort a fcp_pkt
|
|
* @fsp: The FCP packet to abort on
|
|
*
|
|
* Called to send an abort and then wait for abort completion
|
|
*/
|
|
static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
|
|
{
|
|
int rc = FAILED;
|
|
|
|
if (fc_fcp_send_abort(fsp))
|
|
return FAILED;
|
|
|
|
init_completion(&fsp->tm_done);
|
|
fsp->wait_for_comp = 1;
|
|
|
|
spin_unlock_bh(&fsp->scsi_pkt_lock);
|
|
rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
|
|
spin_lock_bh(&fsp->scsi_pkt_lock);
|
|
fsp->wait_for_comp = 0;
|
|
|
|
if (!rc) {
|
|
FC_FCP_DBG(fsp, "target abort cmd failed\n");
|
|
rc = FAILED;
|
|
} else if (fsp->state & FC_SRB_ABORTED) {
|
|
FC_FCP_DBG(fsp, "target abort cmd passed\n");
|
|
rc = SUCCESS;
|
|
fc_fcp_complete_locked(fsp);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* fc_lun_reset_send() - Send LUN reset command
|
|
* @data: The FCP packet that identifies the LUN to be reset
|
|
*/
|
|
static void fc_lun_reset_send(unsigned long data)
|
|
{
|
|
struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
|
|
struct fc_lport *lport = fsp->lp;
|
|
if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
|
|
if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
|
|
return;
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
return;
|
|
setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
|
|
fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
|
|
fc_fcp_unlock_pkt(fsp);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* fc_lun_reset() - Send a LUN RESET command to a device
|
|
* and wait for the reply
|
|
* @lport: The local port to sent the comand on
|
|
* @fsp: The FCP packet that identifies the LUN to be reset
|
|
* @id: The SCSI command ID
|
|
* @lun: The LUN ID to be reset
|
|
*/
|
|
static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
|
|
unsigned int id, unsigned int lun)
|
|
{
|
|
int rc;
|
|
|
|
fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
|
|
fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
|
|
int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
|
|
|
|
fsp->wait_for_comp = 1;
|
|
init_completion(&fsp->tm_done);
|
|
|
|
fc_lun_reset_send((unsigned long)fsp);
|
|
|
|
/*
|
|
* wait for completion of reset
|
|
* after that make sure all commands are terminated
|
|
*/
|
|
rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
|
|
|
|
spin_lock_bh(&fsp->scsi_pkt_lock);
|
|
fsp->state |= FC_SRB_COMPL;
|
|
spin_unlock_bh(&fsp->scsi_pkt_lock);
|
|
|
|
del_timer_sync(&fsp->timer);
|
|
|
|
spin_lock_bh(&fsp->scsi_pkt_lock);
|
|
if (fsp->seq_ptr) {
|
|
lport->tt.exch_done(fsp->seq_ptr);
|
|
fsp->seq_ptr = NULL;
|
|
}
|
|
fsp->wait_for_comp = 0;
|
|
spin_unlock_bh(&fsp->scsi_pkt_lock);
|
|
|
|
if (!rc) {
|
|
FC_SCSI_DBG(lport, "lun reset failed\n");
|
|
return FAILED;
|
|
}
|
|
|
|
/* cdb_status holds the tmf's rsp code */
|
|
if (fsp->cdb_status != FCP_TMF_CMPL)
|
|
return FAILED;
|
|
|
|
FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
|
|
fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* fc_tm_done() - Task Managment response handler
|
|
* @seq: The sequence that the response is on
|
|
* @fp: The response frame
|
|
* @arg: The FCP packet the response is for
|
|
*/
|
|
static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
|
|
{
|
|
struct fc_fcp_pkt *fsp = arg;
|
|
struct fc_frame_header *fh;
|
|
|
|
if (IS_ERR(fp)) {
|
|
/*
|
|
* If there is an error just let it timeout or wait
|
|
* for TMF to be aborted if it timedout.
|
|
*
|
|
* scsi-eh will escalate for when either happens.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
return;
|
|
|
|
/*
|
|
* raced with eh timeout handler.
|
|
*/
|
|
if (!fsp->seq_ptr || !fsp->wait_for_comp) {
|
|
spin_unlock_bh(&fsp->scsi_pkt_lock);
|
|
return;
|
|
}
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
if (fh->fh_type != FC_TYPE_BLS)
|
|
fc_fcp_resp(fsp, fp);
|
|
fsp->seq_ptr = NULL;
|
|
fsp->lp->tt.exch_done(seq);
|
|
fc_frame_free(fp);
|
|
fc_fcp_unlock_pkt(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
|
|
* @lport: The local port to be cleaned up
|
|
*/
|
|
static void fc_fcp_cleanup(struct fc_lport *lport)
|
|
{
|
|
fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_timeout() - Handler for fcp_pkt timeouts
|
|
* @data: The FCP packet that has timed out
|
|
*
|
|
* If REC is supported then just issue it and return. The REC exchange will
|
|
* complete or time out and recovery can continue at that point. Otherwise,
|
|
* if the response has been received without all the data it has been
|
|
* ER_TIMEOUT since the response was received. If the response has not been
|
|
* received we see if data was received recently. If it has been then we
|
|
* continue waiting, otherwise, we abort the command.
|
|
*/
|
|
static void fc_fcp_timeout(unsigned long data)
|
|
{
|
|
struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
|
|
struct fc_rport *rport = fsp->rport;
|
|
struct fc_rport_libfc_priv *rpriv = rport->dd_data;
|
|
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
return;
|
|
|
|
if (fsp->cdb_cmd.fc_tm_flags)
|
|
goto unlock;
|
|
|
|
fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
|
|
|
|
if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
|
|
fc_fcp_rec(fsp);
|
|
else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
|
|
jiffies))
|
|
fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
|
|
else if (fsp->state & FC_SRB_RCV_STATUS)
|
|
fc_fcp_complete_locked(fsp);
|
|
else
|
|
fc_fcp_recovery(fsp);
|
|
fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
|
|
unlock:
|
|
fc_fcp_unlock_pkt(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_rec() - Send a REC ELS request
|
|
* @fsp: The FCP packet to send the REC request on
|
|
*/
|
|
static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
|
|
{
|
|
struct fc_lport *lport;
|
|
struct fc_frame *fp;
|
|
struct fc_rport *rport;
|
|
struct fc_rport_libfc_priv *rpriv;
|
|
|
|
lport = fsp->lp;
|
|
rport = fsp->rport;
|
|
rpriv = rport->dd_data;
|
|
if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
|
|
fsp->status_code = FC_HRD_ERROR;
|
|
fsp->io_status = 0;
|
|
fc_fcp_complete_locked(fsp);
|
|
return;
|
|
}
|
|
fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
|
|
if (!fp)
|
|
goto retry;
|
|
|
|
fr_seq(fp) = fsp->seq_ptr;
|
|
fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
|
|
rpriv->local_port->port_id, FC_TYPE_ELS,
|
|
FC_FCTL_REQ, 0);
|
|
if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
|
|
fc_fcp_rec_resp, fsp,
|
|
jiffies_to_msecs(FC_SCSI_REC_TOV))) {
|
|
fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
|
|
return;
|
|
}
|
|
retry:
|
|
if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
|
|
fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
|
|
else
|
|
fc_fcp_recovery(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_rec_resp() - Handler for REC ELS responses
|
|
* @seq: The sequence the response is on
|
|
* @fp: The response frame
|
|
* @arg: The FCP packet the response is on
|
|
*
|
|
* If the response is a reject then the scsi layer will handle
|
|
* the timeout. If the response is a LS_ACC then if the I/O was not completed
|
|
* set the timeout and return. If the I/O was completed then complete the
|
|
* exchange and tell the SCSI layer.
|
|
*/
|
|
static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
|
|
{
|
|
struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
|
|
struct fc_els_rec_acc *recp;
|
|
struct fc_els_ls_rjt *rjt;
|
|
u32 e_stat;
|
|
u8 opcode;
|
|
u32 offset;
|
|
enum dma_data_direction data_dir;
|
|
enum fc_rctl r_ctl;
|
|
struct fc_rport_libfc_priv *rpriv;
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_fcp_rec_error(fsp, fp);
|
|
return;
|
|
}
|
|
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
goto out;
|
|
|
|
fsp->recov_retry = 0;
|
|
opcode = fc_frame_payload_op(fp);
|
|
if (opcode == ELS_LS_RJT) {
|
|
rjt = fc_frame_payload_get(fp, sizeof(*rjt));
|
|
switch (rjt->er_reason) {
|
|
default:
|
|
FC_FCP_DBG(fsp, "device %x unexpected REC reject "
|
|
"reason %d expl %d\n",
|
|
fsp->rport->port_id, rjt->er_reason,
|
|
rjt->er_explan);
|
|
/* fall through */
|
|
case ELS_RJT_UNSUP:
|
|
FC_FCP_DBG(fsp, "device does not support REC\n");
|
|
rpriv = fsp->rport->dd_data;
|
|
/*
|
|
* if we do not spport RECs or got some bogus
|
|
* reason then resetup timer so we check for
|
|
* making progress.
|
|
*/
|
|
rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
|
|
fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
|
|
break;
|
|
case ELS_RJT_LOGIC:
|
|
case ELS_RJT_UNAB:
|
|
/*
|
|
* If no data transfer, the command frame got dropped
|
|
* so we just retry. If data was transferred, we
|
|
* lost the response but the target has no record,
|
|
* so we abort and retry.
|
|
*/
|
|
if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
|
|
fsp->xfer_len == 0) {
|
|
fc_fcp_retry_cmd(fsp);
|
|
break;
|
|
}
|
|
fc_fcp_recovery(fsp);
|
|
break;
|
|
}
|
|
} else if (opcode == ELS_LS_ACC) {
|
|
if (fsp->state & FC_SRB_ABORTED)
|
|
goto unlock_out;
|
|
|
|
data_dir = fsp->cmd->sc_data_direction;
|
|
recp = fc_frame_payload_get(fp, sizeof(*recp));
|
|
offset = ntohl(recp->reca_fc4value);
|
|
e_stat = ntohl(recp->reca_e_stat);
|
|
|
|
if (e_stat & ESB_ST_COMPLETE) {
|
|
|
|
/*
|
|
* The exchange is complete.
|
|
*
|
|
* For output, we must've lost the response.
|
|
* For input, all data must've been sent.
|
|
* We lost may have lost the response
|
|
* (and a confirmation was requested) and maybe
|
|
* some data.
|
|
*
|
|
* If all data received, send SRR
|
|
* asking for response. If partial data received,
|
|
* or gaps, SRR requests data at start of gap.
|
|
* Recovery via SRR relies on in-order-delivery.
|
|
*/
|
|
if (data_dir == DMA_TO_DEVICE) {
|
|
r_ctl = FC_RCTL_DD_CMD_STATUS;
|
|
} else if (fsp->xfer_contig_end == offset) {
|
|
r_ctl = FC_RCTL_DD_CMD_STATUS;
|
|
} else {
|
|
offset = fsp->xfer_contig_end;
|
|
r_ctl = FC_RCTL_DD_SOL_DATA;
|
|
}
|
|
fc_fcp_srr(fsp, r_ctl, offset);
|
|
} else if (e_stat & ESB_ST_SEQ_INIT) {
|
|
|
|
/*
|
|
* The remote port has the initiative, so just
|
|
* keep waiting for it to complete.
|
|
*/
|
|
fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
|
|
} else {
|
|
|
|
/*
|
|
* The exchange is incomplete, we have seq. initiative.
|
|
* Lost response with requested confirmation,
|
|
* lost confirmation, lost transfer ready or
|
|
* lost write data.
|
|
*
|
|
* For output, if not all data was received, ask
|
|
* for transfer ready to be repeated.
|
|
*
|
|
* If we received or sent all the data, send SRR to
|
|
* request response.
|
|
*
|
|
* If we lost a response, we may have lost some read
|
|
* data as well.
|
|
*/
|
|
r_ctl = FC_RCTL_DD_SOL_DATA;
|
|
if (data_dir == DMA_TO_DEVICE) {
|
|
r_ctl = FC_RCTL_DD_CMD_STATUS;
|
|
if (offset < fsp->data_len)
|
|
r_ctl = FC_RCTL_DD_DATA_DESC;
|
|
} else if (offset == fsp->xfer_contig_end) {
|
|
r_ctl = FC_RCTL_DD_CMD_STATUS;
|
|
} else if (fsp->xfer_contig_end < offset) {
|
|
offset = fsp->xfer_contig_end;
|
|
}
|
|
fc_fcp_srr(fsp, r_ctl, offset);
|
|
}
|
|
}
|
|
unlock_out:
|
|
fc_fcp_unlock_pkt(fsp);
|
|
out:
|
|
fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
|
|
fc_frame_free(fp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_rec_error() - Handler for REC errors
|
|
* @fsp: The FCP packet the error is on
|
|
* @fp: The REC frame
|
|
*/
|
|
static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
|
|
{
|
|
int error = PTR_ERR(fp);
|
|
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
goto out;
|
|
|
|
switch (error) {
|
|
case -FC_EX_CLOSED:
|
|
fc_fcp_retry_cmd(fsp);
|
|
break;
|
|
|
|
default:
|
|
FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
|
|
fsp, fsp->rport->port_id, error);
|
|
fsp->status_code = FC_CMD_PLOGO;
|
|
/* fall through */
|
|
|
|
case -FC_EX_TIMEOUT:
|
|
/*
|
|
* Assume REC or LS_ACC was lost.
|
|
* The exchange manager will have aborted REC, so retry.
|
|
*/
|
|
FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
|
|
fsp->rport->port_id, error, fsp->recov_retry,
|
|
FC_MAX_RECOV_RETRY);
|
|
if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
|
|
fc_fcp_rec(fsp);
|
|
else
|
|
fc_fcp_recovery(fsp);
|
|
break;
|
|
}
|
|
fc_fcp_unlock_pkt(fsp);
|
|
out:
|
|
fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_recovery() - Handler for fcp_pkt recovery
|
|
* @fsp: The FCP pkt that needs to be aborted
|
|
*/
|
|
static void fc_fcp_recovery(struct fc_fcp_pkt *fsp)
|
|
{
|
|
fsp->status_code = FC_CMD_RECOVERY;
|
|
fsp->cdb_status = 0;
|
|
fsp->io_status = 0;
|
|
/*
|
|
* if this fails then we let the scsi command timer fire and
|
|
* scsi-ml escalate.
|
|
*/
|
|
fc_fcp_send_abort(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
|
|
* @fsp: The FCP packet the SRR is to be sent on
|
|
* @r_ctl: The R_CTL field for the SRR request
|
|
* This is called after receiving status but insufficient data, or
|
|
* when expecting status but the request has timed out.
|
|
*/
|
|
static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
|
|
{
|
|
struct fc_lport *lport = fsp->lp;
|
|
struct fc_rport *rport;
|
|
struct fc_rport_libfc_priv *rpriv;
|
|
struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
|
|
struct fc_seq *seq;
|
|
struct fcp_srr *srr;
|
|
struct fc_frame *fp;
|
|
u8 cdb_op;
|
|
|
|
rport = fsp->rport;
|
|
rpriv = rport->dd_data;
|
|
cdb_op = fsp->cdb_cmd.fc_cdb[0];
|
|
|
|
if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
|
|
rpriv->rp_state != RPORT_ST_READY)
|
|
goto retry; /* shouldn't happen */
|
|
fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
|
|
if (!fp)
|
|
goto retry;
|
|
|
|
srr = fc_frame_payload_get(fp, sizeof(*srr));
|
|
memset(srr, 0, sizeof(*srr));
|
|
srr->srr_op = ELS_SRR;
|
|
srr->srr_ox_id = htons(ep->oxid);
|
|
srr->srr_rx_id = htons(ep->rxid);
|
|
srr->srr_r_ctl = r_ctl;
|
|
srr->srr_rel_off = htonl(offset);
|
|
|
|
fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
|
|
rpriv->local_port->port_id, FC_TYPE_FCP,
|
|
FC_FCTL_REQ, 0);
|
|
|
|
seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp, NULL,
|
|
fsp, jiffies_to_msecs(FC_SCSI_REC_TOV));
|
|
if (!seq)
|
|
goto retry;
|
|
|
|
fsp->recov_seq = seq;
|
|
fsp->xfer_len = offset;
|
|
fsp->xfer_contig_end = offset;
|
|
fsp->state &= ~FC_SRB_RCV_STATUS;
|
|
fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
|
|
return;
|
|
retry:
|
|
fc_fcp_retry_cmd(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_srr_resp() - Handler for SRR response
|
|
* @seq: The sequence the SRR is on
|
|
* @fp: The SRR frame
|
|
* @arg: The FCP packet the SRR is on
|
|
*/
|
|
static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
|
|
{
|
|
struct fc_fcp_pkt *fsp = arg;
|
|
struct fc_frame_header *fh;
|
|
|
|
if (IS_ERR(fp)) {
|
|
fc_fcp_srr_error(fsp, fp);
|
|
return;
|
|
}
|
|
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
goto out;
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
/*
|
|
* BUG? fc_fcp_srr_error calls exch_done which would release
|
|
* the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
|
|
* then fc_exch_timeout would be sending an abort. The exch_done
|
|
* call by fc_fcp_srr_error would prevent fc_exch.c from seeing
|
|
* an abort response though.
|
|
*/
|
|
if (fh->fh_type == FC_TYPE_BLS) {
|
|
fc_fcp_unlock_pkt(fsp);
|
|
return;
|
|
}
|
|
|
|
fsp->recov_seq = NULL;
|
|
switch (fc_frame_payload_op(fp)) {
|
|
case ELS_LS_ACC:
|
|
fsp->recov_retry = 0;
|
|
fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
|
|
break;
|
|
case ELS_LS_RJT:
|
|
default:
|
|
fc_fcp_recovery(fsp);
|
|
break;
|
|
}
|
|
fc_fcp_unlock_pkt(fsp);
|
|
fsp->lp->tt.exch_done(seq);
|
|
out:
|
|
fc_frame_free(fp);
|
|
fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_srr_error() - Handler for SRR errors
|
|
* @fsp: The FCP packet that the SRR error is on
|
|
* @fp: The SRR frame
|
|
*/
|
|
static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
|
|
{
|
|
if (fc_fcp_lock_pkt(fsp))
|
|
goto out;
|
|
fsp->lp->tt.exch_done(fsp->recov_seq);
|
|
fsp->recov_seq = NULL;
|
|
switch (PTR_ERR(fp)) {
|
|
case -FC_EX_TIMEOUT:
|
|
if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
|
|
fc_fcp_rec(fsp);
|
|
else
|
|
fc_fcp_recovery(fsp);
|
|
break;
|
|
case -FC_EX_CLOSED: /* e.g., link failure */
|
|
/* fall through */
|
|
default:
|
|
fc_fcp_retry_cmd(fsp);
|
|
break;
|
|
}
|
|
fc_fcp_unlock_pkt(fsp);
|
|
out:
|
|
fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
|
|
* @lport: The local port to be checked
|
|
*/
|
|
static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
|
|
{
|
|
/* lock ? */
|
|
return (lport->state == LPORT_ST_READY) &&
|
|
lport->link_up && !lport->qfull;
|
|
}
|
|
|
|
/**
|
|
* fc_queuecommand() - The queuecommand function of the SCSI template
|
|
* @cmd: The scsi_cmnd to be executed
|
|
* @done: The callback function to be called when the scsi_cmnd is complete
|
|
*
|
|
* This is the i/o strategy routine, called by the SCSI layer. This routine
|
|
* is called with the host_lock held.
|
|
*/
|
|
int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct fc_lport *lport;
|
|
struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
|
|
struct fc_fcp_pkt *fsp;
|
|
struct fc_rport_libfc_priv *rpriv;
|
|
int rval;
|
|
int rc = 0;
|
|
struct fcoe_dev_stats *stats;
|
|
|
|
lport = shost_priv(sc_cmd->device->host);
|
|
spin_unlock_irq(lport->host->host_lock);
|
|
|
|
rval = fc_remote_port_chkready(rport);
|
|
if (rval) {
|
|
sc_cmd->result = rval;
|
|
done(sc_cmd);
|
|
goto out;
|
|
}
|
|
|
|
if (!*(struct fc_remote_port **)rport->dd_data) {
|
|
/*
|
|
* rport is transitioning from blocked/deleted to
|
|
* online
|
|
*/
|
|
sc_cmd->result = DID_IMM_RETRY << 16;
|
|
done(sc_cmd);
|
|
goto out;
|
|
}
|
|
|
|
rpriv = rport->dd_data;
|
|
|
|
if (!fc_fcp_lport_queue_ready(lport)) {
|
|
if (lport->qfull)
|
|
fc_fcp_can_queue_ramp_down(lport);
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
goto out;
|
|
}
|
|
|
|
fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
|
|
if (fsp == NULL) {
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* build the libfc request pkt
|
|
*/
|
|
fsp->cmd = sc_cmd; /* save the cmd */
|
|
fsp->lp = lport; /* save the softc ptr */
|
|
fsp->rport = rport; /* set the remote port ptr */
|
|
fsp->xfer_ddp = FC_XID_UNKNOWN;
|
|
sc_cmd->scsi_done = done;
|
|
|
|
/*
|
|
* set up the transfer length
|
|
*/
|
|
fsp->data_len = scsi_bufflen(sc_cmd);
|
|
fsp->xfer_len = 0;
|
|
|
|
/*
|
|
* setup the data direction
|
|
*/
|
|
stats = per_cpu_ptr(lport->dev_stats, get_cpu());
|
|
if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
|
|
fsp->req_flags = FC_SRB_READ;
|
|
stats->InputRequests++;
|
|
stats->InputMegabytes = fsp->data_len;
|
|
} else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
|
|
fsp->req_flags = FC_SRB_WRITE;
|
|
stats->OutputRequests++;
|
|
stats->OutputMegabytes = fsp->data_len;
|
|
} else {
|
|
fsp->req_flags = 0;
|
|
stats->ControlRequests++;
|
|
}
|
|
put_cpu();
|
|
|
|
fsp->tgt_flags = rpriv->flags;
|
|
|
|
init_timer(&fsp->timer);
|
|
fsp->timer.data = (unsigned long)fsp;
|
|
|
|
/*
|
|
* send it to the lower layer
|
|
* if we get -1 return then put the request in the pending
|
|
* queue.
|
|
*/
|
|
rval = fc_fcp_pkt_send(lport, fsp);
|
|
if (rval != 0) {
|
|
fsp->state = FC_SRB_FREE;
|
|
fc_fcp_pkt_release(fsp);
|
|
rc = SCSI_MLQUEUE_HOST_BUSY;
|
|
}
|
|
out:
|
|
spin_lock_irq(lport->host->host_lock);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(fc_queuecommand);
|
|
|
|
/**
|
|
* fc_io_compl() - Handle responses for completed commands
|
|
* @fsp: The FCP packet that is complete
|
|
*
|
|
* Translates fcp_pkt errors to a Linux SCSI errors.
|
|
* The fcp packet lock must be held when calling.
|
|
*/
|
|
static void fc_io_compl(struct fc_fcp_pkt *fsp)
|
|
{
|
|
struct fc_fcp_internal *si;
|
|
struct scsi_cmnd *sc_cmd;
|
|
struct fc_lport *lport;
|
|
unsigned long flags;
|
|
|
|
/* release outstanding ddp context */
|
|
fc_fcp_ddp_done(fsp);
|
|
|
|
fsp->state |= FC_SRB_COMPL;
|
|
if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
|
|
spin_unlock_bh(&fsp->scsi_pkt_lock);
|
|
del_timer_sync(&fsp->timer);
|
|
spin_lock_bh(&fsp->scsi_pkt_lock);
|
|
}
|
|
|
|
lport = fsp->lp;
|
|
si = fc_get_scsi_internal(lport);
|
|
if (!fsp->cmd)
|
|
return;
|
|
|
|
/*
|
|
* if can_queue ramp down is done then try can_queue ramp up
|
|
* since commands are completing now.
|
|
*/
|
|
if (si->last_can_queue_ramp_down_time)
|
|
fc_fcp_can_queue_ramp_up(lport);
|
|
|
|
sc_cmd = fsp->cmd;
|
|
fsp->cmd = NULL;
|
|
|
|
if (!sc_cmd->SCp.ptr)
|
|
return;
|
|
|
|
CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
|
|
switch (fsp->status_code) {
|
|
case FC_COMPLETE:
|
|
if (fsp->cdb_status == 0) {
|
|
/*
|
|
* good I/O status
|
|
*/
|
|
sc_cmd->result = DID_OK << 16;
|
|
if (fsp->scsi_resid)
|
|
CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
|
|
} else {
|
|
/*
|
|
* transport level I/O was ok but scsi
|
|
* has non zero status
|
|
*/
|
|
sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
|
|
}
|
|
break;
|
|
case FC_ERROR:
|
|
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
|
|
"due to FC_ERROR\n");
|
|
sc_cmd->result = DID_ERROR << 16;
|
|
break;
|
|
case FC_DATA_UNDRUN:
|
|
if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
|
|
/*
|
|
* scsi status is good but transport level
|
|
* underrun.
|
|
*/
|
|
if (fsp->state & FC_SRB_RCV_STATUS) {
|
|
sc_cmd->result = DID_OK << 16;
|
|
} else {
|
|
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
|
|
" due to FC_DATA_UNDRUN (trans)\n");
|
|
sc_cmd->result = DID_ERROR << 16;
|
|
}
|
|
} else {
|
|
/*
|
|
* scsi got underrun, this is an error
|
|
*/
|
|
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
|
|
"due to FC_DATA_UNDRUN (scsi)\n");
|
|
CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
|
|
sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
|
|
}
|
|
break;
|
|
case FC_DATA_OVRRUN:
|
|
/*
|
|
* overrun is an error
|
|
*/
|
|
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
|
|
"due to FC_DATA_OVRRUN\n");
|
|
sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
|
|
break;
|
|
case FC_CMD_ABORTED:
|
|
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
|
|
"due to FC_CMD_ABORTED\n");
|
|
sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
|
|
break;
|
|
case FC_CMD_RECOVERY:
|
|
sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
|
|
break;
|
|
case FC_CMD_RESET:
|
|
sc_cmd->result = (DID_RESET << 16);
|
|
break;
|
|
case FC_HRD_ERROR:
|
|
sc_cmd->result = (DID_NO_CONNECT << 16);
|
|
break;
|
|
default:
|
|
FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
|
|
"due to unknown error\n");
|
|
sc_cmd->result = (DID_ERROR << 16);
|
|
break;
|
|
}
|
|
|
|
if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE) {
|
|
sc_cmd->result = (DID_REQUEUE << 16);
|
|
FC_FCP_DBG(fsp, "Returning DID_REQUEUE to scsi-ml\n");
|
|
}
|
|
|
|
spin_lock_irqsave(&si->scsi_queue_lock, flags);
|
|
list_del(&fsp->list);
|
|
spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
|
|
sc_cmd->SCp.ptr = NULL;
|
|
sc_cmd->scsi_done(sc_cmd);
|
|
|
|
/* release ref from initial allocation in queue command */
|
|
fc_fcp_pkt_release(fsp);
|
|
}
|
|
|
|
/**
|
|
* fc_eh_abort() - Abort a command
|
|
* @sc_cmd: The SCSI command to abort
|
|
*
|
|
* From SCSI host template.
|
|
* Send an ABTS to the target device and wait for the response.
|
|
*/
|
|
int fc_eh_abort(struct scsi_cmnd *sc_cmd)
|
|
{
|
|
struct fc_fcp_pkt *fsp;
|
|
struct fc_lport *lport;
|
|
int rc = FAILED;
|
|
unsigned long flags;
|
|
|
|
lport = shost_priv(sc_cmd->device->host);
|
|
if (lport->state != LPORT_ST_READY)
|
|
return rc;
|
|
else if (!lport->link_up)
|
|
return rc;
|
|
|
|
spin_lock_irqsave(lport->host->host_lock, flags);
|
|
fsp = CMD_SP(sc_cmd);
|
|
if (!fsp) {
|
|
/* command completed while scsi eh was setting up */
|
|
spin_unlock_irqrestore(lport->host->host_lock, flags);
|
|
return SUCCESS;
|
|
}
|
|
/* grab a ref so the fsp and sc_cmd cannot be relased from under us */
|
|
fc_fcp_pkt_hold(fsp);
|
|
spin_unlock_irqrestore(lport->host->host_lock, flags);
|
|
|
|
if (fc_fcp_lock_pkt(fsp)) {
|
|
/* completed while we were waiting for timer to be deleted */
|
|
rc = SUCCESS;
|
|
goto release_pkt;
|
|
}
|
|
|
|
rc = fc_fcp_pkt_abort(fsp);
|
|
fc_fcp_unlock_pkt(fsp);
|
|
|
|
release_pkt:
|
|
fc_fcp_pkt_release(fsp);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(fc_eh_abort);
|
|
|
|
/**
|
|
* fc_eh_device_reset() - Reset a single LUN
|
|
* @sc_cmd: The SCSI command which identifies the device whose
|
|
* LUN is to be reset
|
|
*
|
|
* Set from SCSI host template.
|
|
*/
|
|
int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
|
|
{
|
|
struct fc_lport *lport;
|
|
struct fc_fcp_pkt *fsp;
|
|
struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
|
|
int rc = FAILED;
|
|
int rval;
|
|
|
|
rval = fc_remote_port_chkready(rport);
|
|
if (rval)
|
|
goto out;
|
|
|
|
lport = shost_priv(sc_cmd->device->host);
|
|
|
|
if (lport->state != LPORT_ST_READY)
|
|
return rc;
|
|
|
|
FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
|
|
|
|
fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
|
|
if (fsp == NULL) {
|
|
printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Build the libfc request pkt. Do not set the scsi cmnd, because
|
|
* the sc passed in is not setup for execution like when sent
|
|
* through the queuecommand callout.
|
|
*/
|
|
fsp->lp = lport; /* save the softc ptr */
|
|
fsp->rport = rport; /* set the remote port ptr */
|
|
|
|
/*
|
|
* flush outstanding commands
|
|
*/
|
|
rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
|
|
fsp->state = FC_SRB_FREE;
|
|
fc_fcp_pkt_release(fsp);
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(fc_eh_device_reset);
|
|
|
|
/**
|
|
* fc_eh_host_reset() - Reset a Scsi_Host.
|
|
* @sc_cmd: The SCSI command that identifies the SCSI host to be reset
|
|
*/
|
|
int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
|
|
{
|
|
struct Scsi_Host *shost = sc_cmd->device->host;
|
|
struct fc_lport *lport = shost_priv(shost);
|
|
unsigned long wait_tmo;
|
|
|
|
FC_SCSI_DBG(lport, "Resetting host\n");
|
|
|
|
lport->tt.lport_reset(lport);
|
|
wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
|
|
while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
|
|
wait_tmo))
|
|
msleep(1000);
|
|
|
|
if (fc_fcp_lport_queue_ready(lport)) {
|
|
shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
|
|
"on port (%6.6x)\n", lport->port_id);
|
|
return SUCCESS;
|
|
} else {
|
|
shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
|
|
"port (%6.6x) is not ready.\n",
|
|
lport->port_id);
|
|
return FAILED;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(fc_eh_host_reset);
|
|
|
|
/**
|
|
* fc_slave_alloc() - Configure the queue depth of a Scsi_Host
|
|
* @sdev: The SCSI device that identifies the SCSI host
|
|
*
|
|
* Configures queue depth based on host's cmd_per_len. If not set
|
|
* then we use the libfc default.
|
|
*/
|
|
int fc_slave_alloc(struct scsi_device *sdev)
|
|
{
|
|
struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
|
|
|
|
if (!rport || fc_remote_port_chkready(rport))
|
|
return -ENXIO;
|
|
|
|
if (sdev->tagged_supported)
|
|
scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
|
|
else
|
|
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
|
|
FC_FCP_DFLT_QUEUE_DEPTH);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fc_slave_alloc);
|
|
|
|
/**
|
|
* fc_change_queue_depth() - Change a device's queue depth
|
|
* @sdev: The SCSI device whose queue depth is to change
|
|
* @qdepth: The new queue depth
|
|
* @reason: The resason for the change
|
|
*/
|
|
int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
|
|
{
|
|
switch (reason) {
|
|
case SCSI_QDEPTH_DEFAULT:
|
|
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
|
|
break;
|
|
case SCSI_QDEPTH_QFULL:
|
|
scsi_track_queue_full(sdev, qdepth);
|
|
break;
|
|
case SCSI_QDEPTH_RAMP_UP:
|
|
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return sdev->queue_depth;
|
|
}
|
|
EXPORT_SYMBOL(fc_change_queue_depth);
|
|
|
|
/**
|
|
* fc_change_queue_type() - Change a device's queue type
|
|
* @sdev: The SCSI device whose queue depth is to change
|
|
* @tag_type: Identifier for queue type
|
|
*/
|
|
int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
|
|
{
|
|
if (sdev->tagged_supported) {
|
|
scsi_set_tag_type(sdev, tag_type);
|
|
if (tag_type)
|
|
scsi_activate_tcq(sdev, sdev->queue_depth);
|
|
else
|
|
scsi_deactivate_tcq(sdev, sdev->queue_depth);
|
|
} else
|
|
tag_type = 0;
|
|
|
|
return tag_type;
|
|
}
|
|
EXPORT_SYMBOL(fc_change_queue_type);
|
|
|
|
/**
|
|
* fc_fcp_destory() - Tear down the FCP layer for a given local port
|
|
* @lport: The local port that no longer needs the FCP layer
|
|
*/
|
|
void fc_fcp_destroy(struct fc_lport *lport)
|
|
{
|
|
struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
|
|
|
|
if (!list_empty(&si->scsi_pkt_queue))
|
|
printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
|
|
"port (%6.6x)\n", lport->port_id);
|
|
|
|
mempool_destroy(si->scsi_pkt_pool);
|
|
kfree(si);
|
|
lport->scsi_priv = NULL;
|
|
}
|
|
EXPORT_SYMBOL(fc_fcp_destroy);
|
|
|
|
int fc_setup_fcp()
|
|
{
|
|
int rc = 0;
|
|
|
|
scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
|
|
sizeof(struct fc_fcp_pkt),
|
|
0, SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!scsi_pkt_cachep) {
|
|
printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
|
|
"module load failed!");
|
|
rc = -ENOMEM;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
void fc_destroy_fcp()
|
|
{
|
|
if (scsi_pkt_cachep)
|
|
kmem_cache_destroy(scsi_pkt_cachep);
|
|
}
|
|
|
|
/**
|
|
* fc_fcp_init() - Initialize the FCP layer for a local port
|
|
* @lport: The local port to initialize the exchange layer for
|
|
*/
|
|
int fc_fcp_init(struct fc_lport *lport)
|
|
{
|
|
int rc;
|
|
struct fc_fcp_internal *si;
|
|
|
|
if (!lport->tt.fcp_cmd_send)
|
|
lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
|
|
|
|
if (!lport->tt.fcp_cleanup)
|
|
lport->tt.fcp_cleanup = fc_fcp_cleanup;
|
|
|
|
if (!lport->tt.fcp_abort_io)
|
|
lport->tt.fcp_abort_io = fc_fcp_abort_io;
|
|
|
|
si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
|
|
if (!si)
|
|
return -ENOMEM;
|
|
lport->scsi_priv = si;
|
|
si->max_can_queue = lport->host->can_queue;
|
|
INIT_LIST_HEAD(&si->scsi_pkt_queue);
|
|
spin_lock_init(&si->scsi_queue_lock);
|
|
|
|
si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
|
|
if (!si->scsi_pkt_pool) {
|
|
rc = -ENOMEM;
|
|
goto free_internal;
|
|
}
|
|
return 0;
|
|
|
|
free_internal:
|
|
kfree(si);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(fc_fcp_init);
|