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scsi: qla2xxx: Add ability to autodetect SFP type

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SFP can come in 2 formats: short range/SR and long range/LR.  For LR,
user the can increase the number of Buffer to Buffer credits between end
points via Cavium's command line tool.  By default, FW uses a lower BB
Credit value optimized for SR.  This patch will read the SFP for each
link up event and during chip reset sequence. If the SFP type and
setting are mismatch, then the chip is reset 1 time to use the
appropriate setting.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran
2017-08-23 15:05:07 -07:00
committed by Martin K. Petersen
parent b2e8ae3f0e
commit e4e3a2ce95
7 changed files with 361 additions and 43 deletions
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42
drivers/scsi/qla2xxx/qla_attr.c
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@@ -565,47 +565,17 @@ qla2x00_sysfs_read_sfp(struct file *filp, struct kobject *kobj,
{
struct scsi_qla_host *vha = shost_priv(dev_to_shost(container_of(kobj,
struct device, kobj)));
struct qla_hw_data *ha = vha->hw;
uint16_t iter, addr, offset;
int rval;
if (!capable(CAP_SYS_ADMIN) || off != 0 || count != SFP_DEV_SIZE * 2)
if (!capable(CAP_SYS_ADMIN) || off != 0 || count < SFP_DEV_SIZE)
return 0;
if (ha->sfp_data)
goto do_read;
ha->sfp_data = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL,
&ha->sfp_data_dma);
if (!ha->sfp_data) {
ql_log(ql_log_warn, vha, 0x706c,
"Unable to allocate memory for SFP read-data.\n");
if (qla2x00_reset_active(vha))
return 0;
}
do_read:
memset(ha->sfp_data, 0, SFP_BLOCK_SIZE);
addr = 0xa0;
for (iter = 0, offset = 0; iter < (SFP_DEV_SIZE * 2) / SFP_BLOCK_SIZE;
iter++, offset += SFP_BLOCK_SIZE) {
if (iter == 4) {
/* Skip to next device address. */
addr = 0xa2;
offset = 0;
}
rval = qla2x00_read_sfp(vha, ha->sfp_data_dma, ha->sfp_data,
addr, offset, SFP_BLOCK_SIZE, BIT_1);
if (rval != QLA_SUCCESS) {
ql_log(ql_log_warn, vha, 0x706d,
"Unable to read SFP data (%x/%x/%x).\n", rval,
addr, offset);
return -EIO;
}
memcpy(buf, ha->sfp_data, SFP_BLOCK_SIZE);
buf += SFP_BLOCK_SIZE;
}
rval = qla2x00_read_sfp_dev(vha, buf, count);
if (rval)
return -EIO;
return count;
}
@@ -615,7 +585,7 @@ static struct bin_attribute sysfs_sfp_attr = {
.name = "sfp",
.mode = S_IRUSR | S_IWUSR,
},
.size = SFP_DEV_SIZE * 2,
.size = SFP_DEV_SIZE,
.read = qla2x00_sysfs_read_sfp,
};