Commit 7ace27ae authored by Krishna Gudipati's avatar Krishna Gudipati Committed by James Bottomley
Browse files

[SCSI] bfa: Add support for IO throttling at port level 



Add capability to limit the number of exchanges on a port to
avoid queue-full conditions from the target side.

Signed-off-by: default avatarSudarsana Reddy Kalluru <skalluru@brocade.com>
Signed-off-by: default avatarKrishna Gudipati <kgudipat@brocade.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 6894f013

drivers/scsi/bfa/bfa_core.c

+7 −2
Original line number Diff line number Diff line
@@ -983,7 +983,8 @@ bfa_iocfc_send_cfg(void *bfa_arg) 
		cfg_info->single_msix_vec = 1;

	cfg_info->endian_sig = BFI_IOC_ENDIAN_SIG;

	cfg_info->num_cqs = cfg->fwcfg.num_cqs;

	cfg_info->num_ioim_reqs = cpu_to_be16(cfg->fwcfg.num_ioim_reqs);

	cfg_info->num_ioim_reqs = cpu_to_be16(bfa_fcpim_get_throttle_cfg(bfa,

					       cfg->fwcfg.num_ioim_reqs));

	cfg_info->num_fwtio_reqs = cpu_to_be16(cfg->fwcfg.num_fwtio_reqs);



	bfa_dma_be_addr_set(cfg_info->cfgrsp_addr, iocfc->cfgrsp_dma.pa);
@@ -1245,10 +1246,14 @@ bfa_iocfc_qreg(struct bfa_s *bfa, struct bfi_iocfc_qreg_s *qreg) 
static void

bfa_iocfc_res_recfg(struct bfa_s *bfa, struct bfa_iocfc_fwcfg_s *fwcfg)

{

	struct bfa_iocfc_s	*iocfc   = &bfa->iocfc;

	struct bfi_iocfc_cfg_s	*cfg_info = iocfc->cfginfo;



	bfa_fcxp_res_recfg(bfa, fwcfg->num_fcxp_reqs);

	bfa_uf_res_recfg(bfa, fwcfg->num_uf_bufs);

	bfa_rport_res_recfg(bfa, fwcfg->num_rports);

	bfa_fcp_res_recfg(bfa, fwcfg->num_ioim_reqs);

	bfa_fcp_res_recfg(bfa, cpu_to_be16(cfg_info->num_ioim_reqs),

			  fwcfg->num_ioim_reqs);

	bfa_tskim_res_recfg(bfa, fwcfg->num_tskim_reqs);

}

drivers/scsi/bfa/bfa_defs_svc.h

+13 −0
Original line number Diff line number Diff line
@@ -875,6 +875,19 @@ struct bfa_lunmask_cfg_s { 
	struct bfa_lun_mask_s	lun_list[MAX_LUN_MASK_CFG];

};



struct bfa_throttle_cfg_s {

	u16	is_valid;

	u16	value;

	u32	rsvd;

};



struct bfa_defs_fcpim_throttle_s {

	u16	max_value;

	u16	cur_value;

	u16	cfg_value;

	u16	rsvd;

};



/*

 *      Physical port configuration

 */

drivers/scsi/bfa/bfa_fcpim.c

+101 −4
Original line number Diff line number Diff line
@@ -3703,6 +3703,7 @@ bfa_fcp_attach(struct bfa_s *bfa, void *bfad, struct bfa_iocfc_cfg_s *cfg, 
	struct bfa_mem_dma_s *seg_ptr;

	u16	idx, nsegs, num_io_req;



	fcp->max_ioim_reqs = cfg->fwcfg.num_ioim_reqs;

	fcp->num_ioim_reqs = cfg->fwcfg.num_ioim_reqs;

	fcp->num_fwtio_reqs  = cfg->fwcfg.num_fwtio_reqs;

	fcp->num_itns   = cfg->fwcfg.num_rports;
@@ -3725,6 +3726,7 @@ bfa_fcp_attach(struct bfa_s *bfa, void *bfad, struct bfa_iocfc_cfg_s *cfg, 
		bfa_iocfc_set_snsbase(bfa, idx, fcp->snsbase[idx].pa);

	}



	fcp->throttle_update_required = 1;

	bfa_fcpim_attach(fcp, bfad, cfg, pcidev);



	bfa_iotag_attach(fcp);
@@ -3763,23 +3765,33 @@ bfa_fcp_iocdisable(struct bfa_s *bfa) 
{

	struct bfa_fcp_mod_s *fcp = BFA_FCP_MOD(bfa);



	/* Enqueue unused ioim resources to free_q */

	list_splice_tail_init(&fcp->iotag_unused_q, &fcp->iotag_ioim_free_q);



	bfa_fcpim_iocdisable(fcp);

}



void

bfa_fcp_res_recfg(struct bfa_s *bfa, u16 num_ioim_fw)

bfa_fcp_res_recfg(struct bfa_s *bfa, u16 num_ioim_fw, u16 max_ioim_fw)

{

	struct bfa_fcp_mod_s	*mod = BFA_FCP_MOD(bfa);

	struct list_head	*qe;

	int	i;



	/* Update io throttle value only once during driver load time */

	if (!mod->throttle_update_required)

		return;



	for (i = 0; i < (mod->num_ioim_reqs - num_ioim_fw); i++) {

		bfa_q_deq_tail(&mod->iotag_ioim_free_q, &qe);

		list_add_tail(qe, &mod->iotag_unused_q);

	}



	if (mod->num_ioim_reqs != num_ioim_fw) {

		bfa_trc(bfa, mod->num_ioim_reqs);

		bfa_trc(bfa, num_ioim_fw);

	}



	mod->max_ioim_reqs = max_ioim_fw;

	mod->num_ioim_reqs = num_ioim_fw;

	mod->throttle_update_required = 0;

}



void
@@ -3837,3 +3849,88 @@ bfa_iotag_attach(struct bfa_fcp_mod_s *fcp) 


	bfa_mem_kva_curp(fcp) = (u8 *) iotag;

}





/**

 * To send config req, first try to use throttle value from flash

 * If 0, then use driver parameter

 * We need to use min(flash_val, drv_val) because

 * memory allocation was done based on this cfg'd value

 */

u16

bfa_fcpim_get_throttle_cfg(struct bfa_s *bfa, u16 drv_cfg_param)

{

	u16 tmp;

	struct bfa_fcp_mod_s *fcp = BFA_FCP_MOD(bfa);



	/*

	 * If throttle value from flash is already in effect after driver is

	 * loaded then until next load, always return current value instead

	 * of actual flash value

	 */

	if (!fcp->throttle_update_required)

		return (u16)fcp->num_ioim_reqs;



	tmp = bfa_dconf_read_data_valid(bfa) ? bfa_fcpim_read_throttle(bfa) : 0;

	if (!tmp || (tmp > drv_cfg_param))

		tmp = drv_cfg_param;



	return tmp;

}



bfa_status_t

bfa_fcpim_write_throttle(struct bfa_s *bfa, u16 value)

{

	if (!bfa_dconf_get_min_cfg(bfa)) {

		BFA_DCONF_MOD(bfa)->dconf->throttle_cfg.value = value;

		BFA_DCONF_MOD(bfa)->dconf->throttle_cfg.is_valid = 1;

		return BFA_STATUS_OK;

	}



	return BFA_STATUS_FAILED;

}



u16

bfa_fcpim_read_throttle(struct bfa_s *bfa)

{

	struct bfa_throttle_cfg_s *throttle_cfg =

			&(BFA_DCONF_MOD(bfa)->dconf->throttle_cfg);



	return ((!bfa_dconf_get_min_cfg(bfa)) ?

	       ((throttle_cfg->is_valid == 1) ? (throttle_cfg->value) : 0) : 0);

}



bfa_status_t

bfa_fcpim_throttle_set(struct bfa_s *bfa, u16 value)

{

	/* in min cfg no commands should run. */

	if ((bfa_dconf_get_min_cfg(bfa) == BFA_TRUE) ||

	    (!bfa_dconf_read_data_valid(bfa)))

		return BFA_STATUS_FAILED;



	bfa_fcpim_write_throttle(bfa, value);



	return bfa_dconf_update(bfa);

}



bfa_status_t

bfa_fcpim_throttle_get(struct bfa_s *bfa, void *buf)

{

	struct bfa_fcpim_s *fcpim = BFA_FCPIM(bfa);

	struct bfa_defs_fcpim_throttle_s throttle;



	if ((bfa_dconf_get_min_cfg(bfa) == BFA_TRUE) ||

	    (!bfa_dconf_read_data_valid(bfa)))

		return BFA_STATUS_FAILED;



	memset(&throttle, 0, sizeof(struct bfa_defs_fcpim_throttle_s));



	throttle.cur_value = (u16)(fcpim->fcp->num_ioim_reqs);

	throttle.cfg_value = bfa_fcpim_read_throttle(bfa);

	if (!throttle.cfg_value)

		throttle.cfg_value = throttle.cur_value;

	throttle.max_value = (u16)(fcpim->fcp->max_ioim_reqs);

	memcpy(buf, &throttle, sizeof(struct bfa_defs_fcpim_throttle_s));



	return BFA_STATUS_OK;

}

drivers/scsi/bfa/bfa_fcpim.h

+8 −1
Original line number Diff line number Diff line
@@ -42,7 +42,7 @@ void bfa_itn_create(struct bfa_s *bfa, struct bfa_rport_s *rport, 
		void (*isr)(struct bfa_s *bfa, struct bfi_msg_s *m));

void bfa_itn_isr(struct bfa_s *bfa, struct bfi_msg_s *m);

void bfa_iotag_attach(struct bfa_fcp_mod_s *fcp);

void bfa_fcp_res_recfg(struct bfa_s *bfa, u16 num_ioim_fw);

void bfa_fcp_res_recfg(struct bfa_s *bfa, u16 num_ioim_fw, u16 max_ioim_fw);



#define BFA_FCP_MOD(_hal)	(&(_hal)->modules.fcp_mod)

#define BFA_MEM_FCP_KVA(__bfa)	(&(BFA_FCP_MOD(__bfa)->kva_seg))
@@ -150,6 +150,7 @@ struct bfa_fcp_mod_s { 
	struct list_head	iotag_unused_q;	/* unused IO resources*/

	struct bfa_iotag_s	*iotag_arr;

	struct bfa_itn_s	*itn_arr;

	int			max_ioim_reqs;

	int			num_ioim_reqs;

	int			num_fwtio_reqs;

	int			num_itns;
@@ -157,6 +158,7 @@ struct bfa_fcp_mod_s { 
	struct bfa_fcpim_s	fcpim;

	struct bfa_mem_dma_s	dma_seg[BFA_FCP_DMA_SEGS];

	struct bfa_mem_kva_s	kva_seg;

	int			throttle_update_required;

};



/*
@@ -418,5 +420,10 @@ bfa_status_t bfa_fcpim_lunmask_delete(struct bfa_s *bfa, u16 vf_id, 
bfa_status_t	bfa_fcpim_lunmask_add(struct bfa_s *bfa, u16 vf_id,

				wwn_t *pwwn, wwn_t rpwwn, struct scsi_lun lun);

bfa_status_t	bfa_fcpim_lunmask_clear(struct bfa_s *bfa);

u16		bfa_fcpim_read_throttle(struct bfa_s *bfa);

bfa_status_t	bfa_fcpim_write_throttle(struct bfa_s *bfa, u16 value);

bfa_status_t	bfa_fcpim_throttle_set(struct bfa_s *bfa, u16 value);

bfa_status_t	bfa_fcpim_throttle_get(struct bfa_s *bfa, void *buf);

u16     bfa_fcpim_get_throttle_cfg(struct bfa_s *bfa, u16 drv_cfg_param);



#endif /* __BFA_FCPIM_H__ */

drivers/scsi/bfa/bfa_fcs_rport.c

+5 −1
Original line number Diff line number Diff line
@@ -3026,6 +3026,9 @@ bfa_fcs_rport_get_attr(struct bfa_fcs_rport_s *rport, 
	struct bfa_rport_qos_attr_s qos_attr;

	struct bfa_fcs_lport_s *port = rport->port;

	bfa_port_speed_t rport_speed = rport->rpf.rpsc_speed;

	struct bfa_port_attr_s port_attr;



	bfa_fcport_get_attr(rport->fcs->bfa, &port_attr);



	memset(rport_attr, 0, sizeof(struct bfa_rport_attr_s));

	memset(&qos_attr, 0, sizeof(struct bfa_rport_qos_attr_s));
@@ -3056,7 +3059,8 @@ bfa_fcs_rport_get_attr(struct bfa_fcs_rport_s *rport, 
			rport_speed =

				bfa_fcport_get_ratelim_speed(rport->fcs->bfa);



		if (rport_speed < bfa_fcs_lport_get_rport_max_speed(port))

		if ((bfa_fcs_lport_get_rport_max_speed(port) !=

		    BFA_PORT_SPEED_UNKNOWN) && (rport_speed < port_attr.speed))

			rport_attr->trl_enforced = BFA_TRUE;

	}

}

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