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scsi: lpfc: raise sg count for nvme to use available sg resources 

The driver allocates a sg list per io struture based on a fixed maximum
size. When it registers with the protocol transports and indicates the max sg
list size it supports, the driver manipulates the fixed value to report a
lesser amount so that it has reserved space for sg elements that are used for
DIF.

The driver initialization path sets the cfg_sg_seg_cnt field to the
manipulated value for scsi. NVME initialization ran afterward and capped it's
maximum by the manipulated value for SCSI. This erroneously made NVME report
the SCSI-reduce-for-DIF value that reduced the max io size for nvme and wasted
sg elements.

Rework the driver so that cfg_sg_seg_cnt becomes the overall maximum size and
allow the max size to be tunable.  A separate (new) scsi sg count is then
setup with the scsi-modified reduced value. NVME then initializes based off
the overall maximum.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2018-09-10 10:30:42 -07:00 committed by Martin K. Petersen
parent 01a8aed6a0
commit 5b9e70b22c
5 changed files with 103 additions and 37 deletions
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3
drivers/scsi/lpfc/lpfc.h
View File

@ -52,7 +52,7 @@ struct lpfc_sli2_slim;
downloads using bsg */
#define LPFC_MIN_SG_SLI4_BUF_SZ 0x800 /* based on LPFC_DEFAULT_SG_SEG_CNT */
#define LPFC_MAX_SG_SLI4_SEG_CNT_DIF 128 /* sg element count per scsi cmnd */
#define LPFC_MAX_BG_SLI4_SEG_CNT_DIF 128 /* sg element count for BlockGuard */
#define LPFC_MAX_SG_SEG_CNT_DIF 512 /* sg element count per scsi cmnd */
#define LPFC_MAX_SG_SEG_CNT 4096 /* sg element count per scsi cmnd */
#define LPFC_MIN_SG_SEG_CNT 32 /* sg element count per scsi cmnd */
@ -790,6 +790,7 @@ struct lpfc_hba {
uint32_t cfg_total_seg_cnt;
uint32_t cfg_sg_seg_cnt;
uint32_t cfg_nvme_seg_cnt;
uint32_t cfg_scsi_seg_cnt;
uint32_t cfg_sg_dma_buf_size;
uint64_t cfg_soft_wwnn;
uint64_t cfg_soft_wwpn;

69
drivers/scsi/lpfc/lpfc_attr.c
View File

@ -5353,15 +5353,74 @@ LPFC_ATTR(delay_discovery, 0, 0, 1,
/*
* lpfc_sg_seg_cnt - Initial Maximum DMA Segment Count
* This value can be set to values between 64 and 4096. The default value is
* 64, but may be increased to allow for larger Max I/O sizes. The scsi layer
* will be allowed to request I/Os of sizes up to (MAX_SEG_COUNT * SEG_SIZE).
* This value can be set to values between 64 and 4096. The default value
* is 64, but may be increased to allow for larger Max I/O sizes. The scsi
* and nvme layers will allow I/O sizes up to (MAX_SEG_COUNT * SEG_SIZE).
* Because of the additional overhead involved in setting up T10-DIF,
* this parameter will be limited to 128 if BlockGuard is enabled under SLI4
* and will be limited to 512 if BlockGuard is enabled under SLI3.
*/
LPFC_ATTR_R(sg_seg_cnt, LPFC_DEFAULT_SG_SEG_CNT, LPFC_MIN_SG_SEG_CNT,
LPFC_MAX_SG_SEG_CNT, "Max Scatter Gather Segment Count");
static uint lpfc_sg_seg_cnt = LPFC_DEFAULT_SG_SEG_CNT;
module_param(lpfc_sg_seg_cnt, uint, 0444);
MODULE_PARM_DESC(lpfc_sg_seg_cnt, "Max Scatter Gather Segment Count");
/**
* lpfc_sg_seg_cnt_show - Display the scatter/gather list sizes
* configured for the adapter
* @dev: class converted to a Scsi_host structure.
* @attr: device attribute, not used.
* @buf: on return contains a string with the list sizes
*
* Returns: size of formatted string.
**/
static ssize_t
lpfc_sg_seg_cnt_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct lpfc_vport *vport = (struct lpfc_vport *)shost->hostdata;
struct lpfc_hba *phba = vport->phba;
int len;
len = snprintf(buf, PAGE_SIZE, "SGL sz: %d total SGEs: %d\n",
phba->cfg_sg_dma_buf_size, phba->cfg_total_seg_cnt);
len += snprintf(buf + len, PAGE_SIZE, "Cfg: %d SCSI: %d NVME: %d\n",
phba->cfg_sg_seg_cnt, phba->cfg_scsi_seg_cnt,
phba->cfg_nvme_seg_cnt);
return len;
}
static DEVICE_ATTR_RO(lpfc_sg_seg_cnt);
/**
* lpfc_sg_seg_cnt_init - Set the hba sg_seg_cnt initial value
* @phba: lpfc_hba pointer.
* @val: contains the initial value
*
* Description:
* Validates the initial value is within range and assigns it to the
* adapter. If not in range, an error message is posted and the
* default value is assigned.
*
* Returns:
* zero if value is in range and is set
* -EINVAL if value was out of range
**/
static int
lpfc_sg_seg_cnt_init(struct lpfc_hba *phba, int val)
{
if (val >= LPFC_MIN_SG_SEG_CNT && val <= LPFC_MAX_SG_SEG_CNT) {
phba->cfg_sg_seg_cnt = val;
return 0;
}
lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
"0409 "LPFC_DRIVER_NAME"_sg_seg_cnt attribute cannot "
"be set to %d, allowed range is [%d, %d]\n",
val, LPFC_MIN_SG_SEG_CNT, LPFC_MAX_SG_SEG_CNT);
phba->cfg_sg_seg_cnt = LPFC_DEFAULT_SG_SEG_CNT;
return -EINVAL;
}
/*
* lpfc_enable_mds_diags: Enable MDS Diagnostics

42
drivers/scsi/lpfc/lpfc_init.c
View File

@ -3956,7 +3956,7 @@ lpfc_create_port(struct lpfc_hba *phba, int instance, struct device *dev)
if (phba->sli_rev == LPFC_SLI_REV4) {
shost->dma_boundary =
phba->sli4_hba.pc_sli4_params.sge_supp_len-1;
shost->sg_tablesize = phba->cfg_sg_seg_cnt;
shost->sg_tablesize = phba->cfg_scsi_seg_cnt;
}
/*
@ -5919,8 +5919,6 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
* There are going to be 2 reserved SGEs: 1 FCP cmnd + 1 FCP rsp
*/
max_buf_size = (2 * SLI4_PAGE_SIZE);
if (phba->cfg_sg_seg_cnt > LPFC_MAX_SGL_SEG_CNT - extra)
phba->cfg_sg_seg_cnt = LPFC_MAX_SGL_SEG_CNT - extra;
/*
* Since lpfc_sg_seg_cnt is module param, the sg_dma_buf_size
@ -5942,9 +5940,16 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
/* Total SGEs for scsi_sg_list and scsi_sg_prot_list */
phba->cfg_total_seg_cnt = LPFC_MAX_SGL_SEG_CNT;
if (phba->cfg_sg_seg_cnt > LPFC_MAX_SG_SLI4_SEG_CNT_DIF)
phba->cfg_sg_seg_cnt =
LPFC_MAX_SG_SLI4_SEG_CNT_DIF;
/*
* If supporting DIF, reduce the seg count for scsi to
* allow room for the DIF sges.
*/
if (phba->cfg_enable_bg &&
phba->cfg_sg_seg_cnt > LPFC_MAX_BG_SLI4_SEG_CNT_DIF)
phba->cfg_scsi_seg_cnt = LPFC_MAX_BG_SLI4_SEG_CNT_DIF;
else
phba->cfg_scsi_seg_cnt = phba->cfg_sg_seg_cnt;
} else {
/*
* The scsi_buf for a regular I/O holds the FCP cmnd,
@ -5958,6 +5963,7 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
/* Total SGEs for scsi_sg_list */
phba->cfg_total_seg_cnt = phba->cfg_sg_seg_cnt + extra;
phba->cfg_scsi_seg_cnt = phba->cfg_sg_seg_cnt;
/*
* NOTE: if (phba->cfg_sg_seg_cnt + extra) <= 256 we only
@ -5965,10 +5971,22 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
*/
}
/* Limit to LPFC_MAX_NVME_SEG_CNT for NVME. */
if (phba->cfg_enable_fc4_type & LPFC_ENABLE_NVME) {
if (phba->cfg_sg_seg_cnt > LPFC_MAX_NVME_SEG_CNT) {
lpfc_printf_log(phba, KERN_INFO, LOG_NVME | LOG_INIT,
"6300 Reducing NVME sg segment "
"cnt to %d\n",
LPFC_MAX_NVME_SEG_CNT);
phba->cfg_nvme_seg_cnt = LPFC_MAX_NVME_SEG_CNT;
} else
phba->cfg_nvme_seg_cnt = phba->cfg_sg_seg_cnt;
}
/* Initialize the host templates with the updated values. */
lpfc_vport_template.sg_tablesize = phba->cfg_sg_seg_cnt;
lpfc_template.sg_tablesize = phba->cfg_sg_seg_cnt;
lpfc_template_no_hr.sg_tablesize = phba->cfg_sg_seg_cnt;
lpfc_vport_template.sg_tablesize = phba->cfg_scsi_seg_cnt;
lpfc_template.sg_tablesize = phba->cfg_scsi_seg_cnt;
lpfc_template_no_hr.sg_tablesize = phba->cfg_scsi_seg_cnt;
if (phba->cfg_sg_dma_buf_size <= LPFC_MIN_SG_SLI4_BUF_SZ)
phba->cfg_sg_dma_buf_size = LPFC_MIN_SG_SLI4_BUF_SZ;
@ -5977,9 +5995,11 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
SLI4_PAGE_ALIGN(phba->cfg_sg_dma_buf_size);
lpfc_printf_log(phba, KERN_INFO, LOG_INIT | LOG_FCP,
"9087 sg_tablesize:%d dmabuf_size:%d total_sge:%d\n",
"9087 sg_seg_cnt:%d dmabuf_size:%d "
"total:%d scsi:%d nvme:%d\n",
phba->cfg_sg_seg_cnt, phba->cfg_sg_dma_buf_size,
phba->cfg_total_seg_cnt);
phba->cfg_total_seg_cnt, phba->cfg_scsi_seg_cnt,
phba->cfg_nvme_seg_cnt);
/* Initialize buffer queue management fields */
INIT_LIST_HEAD(&phba->hbqs[LPFC_ELS_HBQ].hbq_buffer_list);

13
drivers/scsi/lpfc/lpfc_nvme.c
View File

@ -2462,17 +2462,10 @@ lpfc_nvme_create_localport(struct lpfc_vport *vport)
nfcp_info.node_name = wwn_to_u64(vport->fc_nodename.u.wwn);
nfcp_info.port_name = wwn_to_u64(vport->fc_portname.u.wwn);
/* Limit to LPFC_MAX_NVME_SEG_CNT.
* For now need + 1 to get around NVME transport logic.
/* We need to tell the transport layer + 1 because it takes page
* alignment into account. When space for the SGL is allocated we
* allocate + 3, one for cmd, one for rsp and one for this alignment
*/
if (phba->cfg_sg_seg_cnt > LPFC_MAX_NVME_SEG_CNT) {
lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME | LOG_INIT,
"6300 Reducing sg segment cnt to %d\n",
LPFC_MAX_NVME_SEG_CNT);
phba->cfg_nvme_seg_cnt = LPFC_MAX_NVME_SEG_CNT;
} else {
phba->cfg_nvme_seg_cnt = phba->cfg_sg_seg_cnt;
}
lpfc_nvme_template.max_sgl_segments = phba->cfg_nvme_seg_cnt + 1;
lpfc_nvme_template.max_hw_queues = phba->cfg_nvme_io_channel;

13
drivers/scsi/lpfc/lpfc_nvmet.c
View File

@ -1373,17 +1373,10 @@ lpfc_nvmet_create_targetport(struct lpfc_hba *phba)
pinfo.port_name = wwn_to_u64(vport->fc_portname.u.wwn);
pinfo.port_id = vport->fc_myDID;
/* Limit to LPFC_MAX_NVME_SEG_CNT.
* For now need + 1 to get around NVME transport logic.
/* We need to tell the transport layer + 1 because it takes page
* alignment into account. When space for the SGL is allocated we
* allocate + 3, one for cmd, one for rsp and one for this alignment
*/
if (phba->cfg_sg_seg_cnt > LPFC_MAX_NVME_SEG_CNT) {
lpfc_printf_log(phba, KERN_INFO, LOG_NVME | LOG_INIT,
"6400 Reducing sg segment cnt to %d\n",
LPFC_MAX_NVME_SEG_CNT);
phba->cfg_nvme_seg_cnt = LPFC_MAX_NVME_SEG_CNT;
} else {
phba->cfg_nvme_seg_cnt = phba->cfg_sg_seg_cnt;
}
lpfc_tgttemplate.max_sgl_segments = phba->cfg_nvme_seg_cnt + 1;
lpfc_tgttemplate.max_hw_queues = phba->cfg_nvme_io_channel;
lpfc_tgttemplate.target_features = NVMET_FCTGTFEAT_READDATA_RSP;