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scsi: qla2xxx: Fix DMA error when the DIF sg buffer crosses 4GB boundary

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When SGE buffer containing DIF information crosses 4G boundary, it results
in DMA error. This patch fixes this issue by calculating SGE buffer size
and if it crosses 4G boundary, driver will split it into multiple SGE
buffers to avoid DMA error.

Signed-off-by: Giridhar Malavali <gmalavali@marvell.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Giridhar Malavali
2018-12-21 09:33:45 -08:00
committed by Martin K. Petersen
parent 7855d2ba11
commit 50b812755e
8 changed files with 502 additions and 67 deletions
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21
drivers/scsi/qla2xxx/qla_attr.c
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@@ -1002,7 +1002,7 @@ qla2x00_free_sysfs_attr(scsi_qla_host_t *vha, bool stop_beacon)
/* Scsi_Host attributes. */
static ssize_t
qla2x00_drvr_version_show(struct device *dev,
qla2x00_driver_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return scnprintf(buf, PAGE_SIZE, "%s\n", qla2x00_version_str);
@@ -2059,7 +2059,21 @@ ql2xiniexchg_store(struct device *dev, struct device_attribute *attr,
return strlen(buf);
}
static DEVICE_ATTR(driver_version, S_IRUGO, qla2x00_drvr_version_show, NULL);
static ssize_t
qla2x00_dif_bundle_statistics_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
scsi_qla_host_t *vha = shost_priv(class_to_shost(dev));
struct qla_hw_data *ha = vha->hw;
return scnprintf(buf, PAGE_SIZE,
"cross=%llu read=%llu write=%llu kalloc=%llu dma_alloc=%llu unusable=%u\n",
ha->dif_bundle_crossed_pages, ha->dif_bundle_reads,
ha->dif_bundle_writes, ha->dif_bundle_kallocs,
ha->dif_bundle_dma_allocs, ha->pool.unusable.count);
}
static DEVICE_ATTR(driver_version, S_IRUGO, qla2x00_driver_version_show, NULL);
static DEVICE_ATTR(fw_version, S_IRUGO, qla2x00_fw_version_show, NULL);
static DEVICE_ATTR(serial_num, S_IRUGO, qla2x00_serial_num_show, NULL);
static DEVICE_ATTR(isp_name, S_IRUGO, qla2x00_isp_name_show, NULL);
@@ -2112,6 +2126,8 @@ static DEVICE_ATTR(zio_threshold, 0644,
static DEVICE_ATTR_RW(qlini_mode);
static DEVICE_ATTR_RW(ql2xexchoffld);
static DEVICE_ATTR_RW(ql2xiniexchg);
static DEVICE_ATTR(dif_bundle_statistics, 0444,
qla2x00_dif_bundle_statistics_show, NULL);
struct device_attribute *qla2x00_host_attrs[] = {
@@ -2150,6 +2166,7 @@ struct device_attribute *qla2x00_host_attrs[] = {
&dev_attr_min_link_speed,
&dev_attr_max_speed_sup,
&dev_attr_zio_threshold,
&dev_attr_dif_bundle_statistics,
NULL, /* reserve for qlini_mode */
NULL, /* reserve for ql2xiniexchg */
NULL, /* reserve for ql2xexchoffld */