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Commit f2817ec2 authored by Vasu Dev's avatar Vasu Dev Committed by James Bottomley
Browse files

[SCSI] libfc: rec tov value and REC_TOV_CONST units usages is incorrect 



Added REC_TOV_CONST intent was to have rec tov as e_d_tov + 1s
but currently it is e_d_tov + 1ms since e_d_tov is stored in ms
unit.

Also returned rec tov by get_fsp_rec_tov is in ms and this ms tov
is used as-is with fc_fcp_timer_set expecting jiffies tov.

Fixed this by having get_fsp_rec_tov return rec tov in jiffies
as e_d_tov + 1s and then use jiffies tov w/ fc_fcp_timer_set.

Also some cleanup, no need to cache get_fsp_rec_tov return value
in local rec_tov at various places.

Signed-off-by: default avatarVasu Dev <vasu.dev@intel.com>
Tested-by: default avatarRoss Brattain <ross.b.brattain@intel.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 66a5b3ac

drivers/scsi/libfc/fc_fcp.c

+9 −23
Original line number Diff line number Diff line
@@ -57,9 +57,6 @@ static struct kmem_cache *scsi_pkt_cachep; 
#define FC_SRB_READ		(1 << 1)

#define FC_SRB_WRITE		(1 << 0)



/* constant added to e_d_tov timeout to get rec_tov value */

#define REC_TOV_CONST		1



/*

 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock

 */
@@ -248,7 +245,7 @@ static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *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 for the timer

 * @delay: The timeout period in jiffies

 */

static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)

{
@@ -1098,16 +1095,14 @@ static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp) 
/**

 * 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 *rport;

	struct fc_rport_libfc_priv *rpriv;



	rport = fsp->rport;

	rpriv = rport->dd_data;

	struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;



	return rpriv->e_d_tov + REC_TOV_CONST;

	return msecs_to_jiffies(rpriv->e_d_tov) + HZ;

}



/**
@@ -1127,7 +1122,6 @@ static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 
	struct fc_rport_libfc_priv *rpriv;

	const size_t len = sizeof(fsp->cdb_cmd);

	int rc = 0;

	unsigned int rec_tov;



	if (fc_fcp_lock_pkt(fsp))

		return 0;
@@ -1158,12 +1152,9 @@ static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp, 
	fsp->seq_ptr = seq;

	fc_fcp_pkt_hold(fsp);	/* hold for fc_fcp_pkt_destroy */



	rec_tov = get_fsp_rec_tov(fsp);



	setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);



	if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)

		fc_fcp_timer_set(fsp, rec_tov);

		fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));



unlock:

	fc_fcp_unlock_pkt(fsp);
@@ -1240,16 +1231,14 @@ 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;

	unsigned int rec_tov;



	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;

		rec_tov = get_fsp_rec_tov(fsp);

		setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);

		fc_fcp_timer_set(fsp, rec_tov);

		fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));

		fc_fcp_unlock_pkt(fsp);

	}

}
@@ -1541,12 +1530,11 @@ static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 
			}

			fc_fcp_srr(fsp, r_ctl, offset);

		} else if (e_stat & ESB_ST_SEQ_INIT) {

			unsigned int rec_tov = get_fsp_rec_tov(fsp);

			/*

			 * The remote port has the initiative, so just

			 * keep waiting for it to complete.

			 */

			fc_fcp_timer_set(fsp, rec_tov);

			fc_fcp_timer_set(fsp,  get_fsp_rec_tov(fsp));

		} else {



			/*
@@ -1710,7 +1698,6 @@ 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;

	unsigned int rec_tov;



	if (IS_ERR(fp)) {

		fc_fcp_srr_error(fsp, fp);
@@ -1737,8 +1724,7 @@ static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) 
	switch (fc_frame_payload_op(fp)) {

	case ELS_LS_ACC:

		fsp->recov_retry = 0;

		rec_tov = get_fsp_rec_tov(fsp);

		fc_fcp_timer_set(fsp, rec_tov);

		fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));

		break;

	case ELS_LS_RJT:

	default: