--- /dev/null
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
+ * Copyright(c) 2008 Mike Christie
+ *
+ * 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
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/scatterlist.h>
+#include <linux/err.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <scsi/fc/fc_fc2.h>
+
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+
+#include "fc_libfc.h"
+
+static struct kmem_cache *scsi_pkt_cachep;
+
+/* SRB state definitions */
+#define FC_SRB_FREE 0 /* cmd is free */
+#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
+#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
+#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
+#define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
+#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
+#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
+#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
+
+#define FC_SRB_READ (1 << 1)
+#define FC_SRB_WRITE (1 << 0)
+
+/*
+ * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
+ */
+#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
+#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
+#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
+#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
+#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
+
+/**
+ * struct fc_fcp_internal - FCP layer internal data
+ * @scsi_pkt_pool: Memory pool to draw FCP packets from
+ * @scsi_queue_lock: Protects the scsi_pkt_queue
+ * @scsi_pkt_queue: Current FCP packets
+ * @last_can_queue_ramp_down_time: ramp down time
+ * @last_can_queue_ramp_up_time: ramp up time
+ * @max_can_queue: max can_queue size
+ */
+struct fc_fcp_internal {
+ mempool_t *scsi_pkt_pool;
+ spinlock_t scsi_queue_lock;
+ struct list_head scsi_pkt_queue;
+ unsigned long last_can_queue_ramp_down_time;
+ unsigned long last_can_queue_ramp_up_time;
+ int max_can_queue;
+};
+
+#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
+
+/*
+ * function prototypes
+ * FC scsi I/O related functions
+ */
+static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
+static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
+static void fc_fcp_timeout(unsigned long);
+static void fc_fcp_rec(struct fc_fcp_pkt *);
+static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
+static void fc_io_compl(struct fc_fcp_pkt *);
+
+static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
+static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
+
+/*
+ * command status codes
+ */
+#define FC_COMPLETE 0
+#define FC_CMD_ABORTED 1
+#define FC_CMD_RESET 2
+#define FC_CMD_PLOGO 3
+#define FC_SNS_RCV 4
+#define FC_TRANS_ERR 5
+#define FC_DATA_OVRRUN 6
+#define FC_DATA_UNDRUN 7
+#define FC_ERROR 8
+#define FC_HRD_ERROR 9
+#define FC_CRC_ERROR 10
+#define FC_TIMED_OUT 11
+
+/*
+ * Error recovery timeout values.
+ */
+#define FC_SCSI_TM_TOV (10 * HZ)
+#define FC_HOST_RESET_TIMEOUT (30 * HZ)
+#define FC_CAN_QUEUE_PERIOD (60 * HZ)
+
+#define FC_MAX_ERROR_CNT 5
+#define FC_MAX_RECOV_RETRY 3
+
+#define FC_FCP_DFLT_QUEUE_DEPTH 32
+
+/**
+ * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
+ * @lport: The local port that the FCP packet is for
+ * @gfp: GFP flags for allocation
+ *
+ * Return value: fcp_pkt structure or null on allocation failure.
+ * Context: Can be called from process context, no lock is required.
+ */
+static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
+ struct fc_fcp_pkt *fsp;
+
+ fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
+ if (fsp) {
+ memset(fsp, 0, sizeof(*fsp));
+ fsp->lp = lport;
+ fsp->xfer_ddp = FC_XID_UNKNOWN;
+ atomic_set(&fsp->ref_cnt, 1);
+ init_timer(&fsp->timer);
+ fsp->timer.data = (unsigned long)fsp;
+ INIT_LIST_HEAD(&fsp->list);
+ spin_lock_init(&fsp->scsi_pkt_lock);
+ } else {
+ per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++;
+ put_cpu();
+ }
+ return fsp;
+}
+
+/**
+ * fc_fcp_pkt_release() - Release hold on a fcp_pkt
+ * @fsp: The FCP packet to be released
+ *
+ * Context: Can be called from process or interrupt context,
+ * no lock is required.
+ */
+static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
+{
+ if (atomic_dec_and_test(&fsp->ref_cnt)) {
+ struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
+
+ mempool_free(fsp, si->scsi_pkt_pool);
+ }
+}
+
+/**
+ * fc_fcp_pkt_hold() - Hold a fcp_pkt
+ * @fsp: The FCP packet to be held
+ */
+static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
+{
+ atomic_inc(&fsp->ref_cnt);
+}
+
+/**
+ * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
+ * @seq: The sequence that the FCP packet is on (required by destructor API)
+ * @fsp: The FCP packet to be released
+ *
+ * This routine is called by a destructor callback in the exch_seq_send()
+ * routine of the libfc Transport Template. The 'struct fc_seq' is a required
+ * argument even though it is not used by this routine.
+ *
+ * Context: No locking required.
+ */
+static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
+{
+ fc_fcp_pkt_release(fsp);
+}
+
+/**
+ * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
+ * @fsp: The FCP packet to be locked and incremented
+ *
+ * We should only return error if we return a command to SCSI-ml before
+ * getting a response. This can happen in cases where we send a abort, but
+ * do not wait for the response and the abort and command can be passing
+ * each other on the wire/network-layer.
+ *
+ * Note: this function locks the packet and gets a reference to allow
+ * callers to call the completion function while the lock is held and
+ * not have to worry about the packets refcount.
+ *
+ * TODO: Maybe we should just have callers grab/release the lock and
+ * have a function that they call to verify the fsp and grab a ref if
+ * needed.
+ */
+static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
+{
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ if (fsp->state & FC_SRB_COMPL) {
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ return -EPERM;
+ }
+
+ fc_fcp_pkt_hold(fsp);
+ return 0;
+}
+
+/**
+ * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
+ * reference count
+ * @fsp: The FCP packet to be unlocked and decremented
+ */
+static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
+{
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ fc_fcp_pkt_release(fsp);
+}
+
+/**
+ * fc_fcp_timer_set() - Start a timer for a fcp_pkt
+ * @fsp: The FCP packet to start a timer for
+ * @delay: The timeout period in jiffies
+ */
+static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
+{
+ if (!(fsp->state & FC_SRB_COMPL))
+ mod_timer(&fsp->timer, jiffies + delay);
+}
+
+/**
+ * fc_fcp_send_abort() - Send an abort for exchanges associated with a
+ * fcp_pkt
+ * @fsp: The FCP packet to abort exchanges on
+ */
+static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
+{
+ if (!fsp->seq_ptr)
+ return -EINVAL;
+
+ per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++;
+ put_cpu();
+
+ fsp->state |= FC_SRB_ABORT_PENDING;
+ return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
+}
+
+/**
+ * fc_fcp_retry_cmd() - Retry a fcp_pkt
+ * @fsp: The FCP packet to be retried
+ *
+ * Sets the status code to be FC_ERROR and then calls
+ * fc_fcp_complete_locked() which in turn calls fc_io_compl().
+ * fc_io_compl() will notify the SCSI-ml that the I/O is done.
+ * The SCSI-ml will retry the command.
+ */
+static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
+{
+ if (fsp->seq_ptr) {
+ fsp->lp->tt.exch_done(fsp->seq_ptr);
+ fsp->seq_ptr = NULL;
+ }
+
+ fsp->state &= ~FC_SRB_ABORT_PENDING;
+ fsp->io_status = 0;
+ fsp->status_code = FC_ERROR;
+ fc_fcp_complete_locked(fsp);
+}
+
+/**
+ * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
+ * @fsp: The FCP packet that will manage the DDP frames
+ * @xid: The XID that will be used for the DDP exchange
+ */
+void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
+{
+ struct fc_lport *lport;
+
+ lport = fsp->lp;
+ if ((fsp->req_flags & FC_SRB_READ) &&
+ (lport->lro_enabled) && (lport->tt.ddp_setup)) {
+ if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
+ scsi_sg_count(fsp->cmd)))
+ fsp->xfer_ddp = xid;
+ }
+}
+
+/**
+ * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
+ * DDP related resources for a fcp_pkt
+ * @fsp: The FCP packet that DDP had been used on
+ */
+void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
+{
+ struct fc_lport *lport;
+
+ if (!fsp)
+ return;
+
+ if (fsp->xfer_ddp == FC_XID_UNKNOWN)
+ return;
+
+ lport = fsp->lp;
+ if (lport->tt.ddp_done) {
+ fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
+ fsp->xfer_ddp = FC_XID_UNKNOWN;
+ }
+}
+
+/**
+ * fc_fcp_can_queue_ramp_up() - increases can_queue
+ * @lport: lport to ramp up can_queue
+ */
+static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
+ unsigned long flags;
+ int can_queue;
+
+ spin_lock_irqsave(lport->host->host_lock, flags);
+
+ if (si->last_can_queue_ramp_up_time &&
+ (time_before(jiffies, si->last_can_queue_ramp_up_time +
+ FC_CAN_QUEUE_PERIOD)))
+ goto unlock;
+
+ if (time_before(jiffies, si->last_can_queue_ramp_down_time +
+ FC_CAN_QUEUE_PERIOD))
+ goto unlock;
+
+ si->last_can_queue_ramp_up_time = jiffies;
+
+ can_queue = lport->host->can_queue << 1;
+ if (can_queue >= si->max_can_queue) {
+ can_queue = si->max_can_queue;
+ si->last_can_queue_ramp_down_time = 0;
+ }
+ lport->host->can_queue = can_queue;
+ shost_printk(KERN_ERR, lport->host, "libfc: increased "
+ "can_queue to %d.\n", can_queue);
+
+unlock:
+ spin_unlock_irqrestore(lport->host->host_lock, flags);
+}
+
+/**
+ * fc_fcp_can_queue_ramp_down() - reduces can_queue
+ * @lport: lport to reduce can_queue
+ *
+ * If we are getting memory allocation failures, then we may
+ * be trying to execute too many commands. We let the running
+ * commands complete or timeout, then try again with a reduced
+ * can_queue. Eventually we will hit the point where we run
+ * on all reserved structs.
+ */
+static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
+ unsigned long flags;
+ int can_queue;
+
+ spin_lock_irqsave(lport->host->host_lock, flags);
+
+ if (si->last_can_queue_ramp_down_time &&
+ (time_before(jiffies, si->last_can_queue_ramp_down_time +
+ FC_CAN_QUEUE_PERIOD)))
+ goto unlock;
+
+ si->last_can_queue_ramp_down_time = jiffies;
+
+ can_queue = lport->host->can_queue;
+ can_queue >>= 1;
+ if (!can_queue)
+ can_queue = 1;
+ lport->host->can_queue = can_queue;
+ shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
+ "Reducing can_queue to %d.\n", can_queue);
+
+unlock:
+ spin_unlock_irqrestore(lport->host->host_lock, flags);
+}
+
+/*
+ * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
+ * @lport: fc lport struct
+ * @len: payload length
+ *
+ * Allocates fc_frame structure and buffer but if fails to allocate
+ * then reduce can_queue.
+ */
+static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
+ size_t len)
+{
+ struct fc_frame *fp;
+
+ fp = fc_frame_alloc(lport, len);
+ if (likely(fp))
+ return fp;
+
+ per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++;
+ put_cpu();
+ /* error case */
+ fc_fcp_can_queue_ramp_down(lport);
+ return NULL;
+}
+
+/**
+ * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
+ * @fsp: The FCP packet the data is on
+ * @fp: The data frame
+ */
+static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ struct scsi_cmnd *sc = fsp->cmd;
+ struct fc_lport *lport = fsp->lp;
+ struct fc_stats *stats;
+ struct fc_frame_header *fh;
+ size_t start_offset;
+ size_t offset;
+ u32 crc;
+ u32 copy_len = 0;
+ size_t len;
+ void *buf;
+ struct scatterlist *sg;
+ u32 nents;
+ u8 host_bcode = FC_COMPLETE;
+
+ 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.
+ *
+ * Indicate error to scsi-ml because something went wrong with the
+ * ddp handling to get us here.
+ */
+ if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
+ fc_fcp_ddp_done(fsp);
+ FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
+ host_bcode = FC_ERROR;
+ 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);
+
+ /* Data is corrupted indicate scsi-ml should retry */
+ host_bcode = FC_DATA_OVRRUN;
+ 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, NULL);
+ } else {
+ crc = crc32(~0, (u8 *) fh, sizeof(*fh));
+ copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
+ &offset, &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->stats, get_cpu());
+ stats->ErrorFrames++;
+ /* per cpu count, not total count, but OK for limit */
+ if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
+ 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) {
+ host_bcode = FC_CRC_ERROR;
+ 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, host_bcode);
+}
+
+/**
+ * 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);
+ memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
+ sg_bytes);
+ kunmap_atomic(page_addr);
+ 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 */
+ return error;
+ }
+ fp = NULL;
+ }
+ fsp->xfer_len += seq_blen; /* premature count? */
+ return 0;
+}
+
+/**
+ * fc_fcp_abts_resp() - Receive 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() - Receive 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;
+
+ 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 != FCP_RESP_RSP_INFO_LEN4) &&
+ (respl != FCP_RESP_RSP_INFO_LEN8))
+ 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 transferred 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->cdb_status == SAM_STAT_GOOD &&
+ 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->cdb_status == SAM_STAT_GOOD &&
+ 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;
+ }
+
+ 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);
+ }
+ /*
+ * Some resets driven by SCSI are not I/Os and do not have
+ * SCSI commands associated with the requests. We should not
+ * call I/O completion if we do not have a SCSI command.
+ */
+ if (fsp->cmd)
+ 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, &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);
+ fsp->cmd->SCp.ptr = NULL;
+ list_del(&fsp->list);
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
+ }
+
+ return rc;
+}
+
+/**
+ * get_fsp_rec_tov() - Helper function to get REC_TOV
+ * @fsp: the FCP packet
+ *
+ * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
+ */
+static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
+{
+ struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
+
+ return msecs_to_jiffies(rpriv->e_d_tov) + HZ;
+}
+
+/**
+ * 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->seq_ptr = seq;
+ fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
+
+ setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
+ if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
+ fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
+
+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;
+ unsigned long ticks_left;
+
+ 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);
+ ticks_left = wait_for_completion_timeout(&fsp->tm_done,
+ FC_SCSI_TM_TOV);
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ fsp->wait_for_comp = 0;
+
+ if (!ticks_left) {
+ FC_FCP_DBG(fsp, "target abort cmd failed\n");
+ } 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, get_fsp_rec_tov(fsp));
+ 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 command 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, &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 Management 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))
+ goto out;
+
+ /*
+ * raced with eh timeout handler.
+ */
+ if (!fsp->seq_ptr || !fsp->wait_for_comp)
+ goto out_unlock;
+
+ 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);
+out_unlock:
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_frame_free(fp);
+}
+
+/**
+ * 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 (fsp->state & FC_SRB_RCV_STATUS)
+ fc_fcp_complete_locked(fsp);
+ else
+ fc_fcp_recovery(fsp, FC_TIMED_OUT);
+ 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,
+ 2 * lport->r_a_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, get_fsp_rec_tov(fsp));
+ else
+ fc_fcp_recovery(fsp, FC_TIMED_OUT);
+}
+
+/**
+ * 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;
+ 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, FC_ERROR);
+ 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, get_fsp_rec_tov(fsp));
+ } 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, FC_ERROR);
+ 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, u8 code)
+{
+ fsp->status_code = code;
+ 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;
+ unsigned int rec_tov;
+
+ rport = fsp->rport;
+ rpriv = rport->dd_data;
+
+ 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);
+
+ rec_tov = get_fsp_rec_tov(fsp);
+ seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp,
+ fc_fcp_pkt_destroy,
+ fsp, jiffies_to_msecs(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;
+ }
+
+ switch (fc_frame_payload_op(fp)) {
+ case ELS_LS_ACC:
+ fsp->recov_retry = 0;
+ fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
+ break;
+ case ELS_LS_RJT:
+ default:
+ fc_fcp_recovery(fsp, FC_ERROR);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fsp->lp->tt.exch_done(seq);
+ fc_frame_free(fp);
+}
+
+/**
+ * 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;
+ 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, FC_TIMED_OUT);
+ break;
+ case -FC_EX_CLOSED: /* e.g., link failure */
+ /* fall through */
+ default:
+ fc_fcp_retry_cmd(fsp);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fsp->lp->tt.exch_done(fsp->recov_seq);
+}
+
+/**
+ * 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
+ * @shost: The Scsi_Host that the command was issued to
+ * @cmd: The scsi_cmnd to be executed
+ *
+ * This is the i/o strategy routine, called by the SCSI layer.
+ */
+int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
+{
+ struct fc_lport *lport = shost_priv(shost);
+ 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 fc_stats *stats;
+
+ rval = fc_remote_port_chkready(rport);
+ if (rval) {
+ sc_cmd->result = rval;
+ sc_cmd->scsi_done(sc_cmd);
+ return 0;
+ }
+
+ if (!*(struct fc_remote_port **)rport->dd_data) {
+ /*
+ * rport is transitioning from blocked/deleted to
+ * online
+ */
+ sc_cmd->result = DID_IMM_RETRY << 16;
+ sc_cmd->scsi_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->rport = rport; /* set the remote port ptr */
+
+ /*
+ * 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->stats, get_cpu());
+ if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
+ fsp->req_flags = FC_SRB_READ;
+ stats->InputRequests++;
+ stats->InputBytes += fsp->data_len;
+ } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
+ fsp->req_flags = FC_SRB_WRITE;
+ stats->OutputRequests++;
+ stats->OutputBytes += fsp->data_len;
+ } else {
+ fsp->req_flags = 0;
+ stats->ControlRequests++;
+ }
+ put_cpu();
+
+ /*
+ * 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:
+ 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 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;
+ 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_RESET:
+ FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
+ "due to FC_CMD_RESET\n");
+ sc_cmd->result = (DID_RESET << 16);
+ break;
+ case FC_HRD_ERROR:
+ FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
+ "due to FC_HRD_ERROR\n");
+ sc_cmd->result = (DID_NO_CONNECT << 16);
+ break;
+ case FC_CRC_ERROR:
+ FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
+ "due to FC_CRC_ERROR\n");
+ sc_cmd->result = (DID_PARITY << 16);
+ break;
+ case FC_TIMED_OUT:
+ FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
+ "due to FC_TIMED_OUT\n");
+ sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
+ 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_TRANSPORT_DISRUPTED << 16);
+
+ spin_lock_irqsave(&si->scsi_queue_lock, flags);
+ list_del(&fsp->list);
+ sc_cmd->SCp.ptr = NULL;
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
+ 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;
+ struct fc_fcp_internal *si;
+ int rc = FAILED;
+ unsigned long flags;
+ int rval;
+
+ rval = fc_block_scsi_eh(sc_cmd);
+ if (rval)
+ return rval;
+
+ lport = shost_priv(sc_cmd->device->host);
+ if (lport->state != LPORT_ST_READY)
+ return rc;
+ else if (!lport->link_up)
+ return rc;
+
+ si = fc_get_scsi_internal(lport);
+ spin_lock_irqsave(&si->scsi_queue_lock, flags);
+ fsp = CMD_SP(sc_cmd);
+ if (!fsp) {
+ /* command completed while scsi eh was setting up */
+ spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
+ return SUCCESS;
+ }
+ /* grab a ref so the fsp and sc_cmd cannot be released from under us */
+ fc_fcp_pkt_hold(fsp);
+ spin_unlock_irqrestore(&si->scsi_queue_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_block_scsi_eh(sc_cmd);
+ if (rval)
+ return rval;
+
+ 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->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");
+
+ fc_block_scsi_eh(sc_cmd);
+
+ 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;
+
+ scsi_change_queue_depth(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
+ return 0;
+}
+EXPORT_SYMBOL(fc_slave_alloc);
+
+/**
+ * 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(void)
+{
+ 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(void)
+{
+ 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);
Code Review / kvmfornfv.git / blobdiff