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Date: Wed, 21 Nov 2018 11:45:10 +0000
From: John Garry <john.garry@...wei.com>
To: Steffen Maier <maier@...ux.ibm.com>, <jejb@...ux.vnet.ibm.com>,
<martin.petersen@...cle.com>
CC: <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
<linux-scsi@...r.kernel.org>,
Xiang Chen <chenxiang66@...ilicon.com>
Subject: Re: [PATCH 3/4] scsi: hisi_sas: Make sg_tablesize consistent value
On 21/11/2018 11:08, Steffen Maier wrote:
> On 11/21/2018 12:02 PM, Steffen Maier wrote:
>> On 11/20/2018 03:59 PM, John Garry wrote:
>>> From: Xiang Chen <chenxiang66@...ilicon.com>
>>>
>>> Sht->sg_tablesize is set in the driver, and it will be assigned to
>>> shost->sg_tablesize in SCSI mid-layer. So it is not necessary to
>>> assign shost->sg_table one more time in the driver.
>>>
>>> In addition to the change, change each scsi_host_template.sg_tablesize
>>> to HISI_SAS_SGE_PAGE_CNT instead of SG_ALL.
>>
>> Might be completely irrelevant, so just as information: I once had
>> problems due to changing (reducing) SHT.sg_tablesize because block
>> queue limits of BSG devices of Scsi_Host and fc_host (not sure if you
>> have an equivalent bsg device for your transport(s)) inherit from SHT,
>> but don't update (automatically) on later updates of
>> shost->sg_tablesize, which in turn affect scsi_devices allocated after
>> the shost update.
>> Cf.
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/s390/scsi?id=5fea4291deacd80188b996d2f555fc6a1940e5d4
>
>
> Figured, your new constant seems to have the same value so no problem.
>
Right, so previously we were doing similar to what you describe -
setting the value in the SHT and then setting shost->sg_tablesize after
the host is allocated.
However the values were the same, so in this patch we're just removing
setting shost->sg_tablesize (again).
Thanks,
John
> #define SG_CHUNK_SIZE 128
> #define SG_ALL SG_CHUNK_SIZE
> #define HISI_SAS_SGE_PAGE_CNT SG_CHUNK_SIZE
>
>> ("[SCSI] zfcp: block queue limits with data router")
>> if you need more details.
>>
>>> Signed-off-by: Xiang Chen <chenxiang66@...ilicon.com>
>>> Signed-off-by: John Garry <john.garry@...wei.com>
>>> ---
>>> drivers/scsi/hisi_sas/hisi_sas_main.c | 1 -
>>> drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 2 +-
>>> drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 2 +-
>>> drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 3 +--
>>> 4 files changed, 3 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c
>>> b/drivers/scsi/hisi_sas/hisi_sas_main.c
>>> index d13a662..cbda48e 100644
>>> --- a/drivers/scsi/hisi_sas/hisi_sas_main.c
>>> +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
>>> @@ -2410,7 +2410,6 @@ int hisi_sas_probe(struct platform_device *pdev,
>>> shost->max_lun = ~0;
>>> shost->max_channel = 1;
>>> shost->max_cmd_len = 16;
>>> - shost->sg_tablesize = min_t(u16, SG_ALL, HISI_SAS_SGE_PAGE_CNT);
>>> if (hisi_hba->hw->slot_index_alloc) {
>>> shost->can_queue = hisi_hba->hw->max_command_entries;
>>> shost->cmd_per_lun = hisi_hba->hw->max_command_entries;
>>> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
>>> b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
>>> index d24342b..2d035cc 100644
>>> --- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
>>> +++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
>>> @@ -1815,7 +1815,7 @@ static int hisi_sas_v1_init(struct hisi_hba
>>> *hisi_hba)
>>> .change_queue_depth = sas_change_queue_depth,
>>> .bios_param = sas_bios_param,
>>> .this_id = -1,
>>> - .sg_tablesize = SG_ALL,
>>> + .sg_tablesize = HISI_SAS_SGE_PAGE_CNT,
>>> .max_sectors = SCSI_DEFAULT_MAX_SECTORS,
>>> .use_clustering = ENABLE_CLUSTERING,
>>> .eh_device_reset_handler = sas_eh_device_reset_handler,
>>> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
>>> b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
>>> index e78a97e..79e58a7 100644
>>> --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
>>> +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
>>> @@ -3570,7 +3570,7 @@ struct device_attribute *host_attrs_v2_hw[] = {
>>> .change_queue_depth = sas_change_queue_depth,
>>> .bios_param = sas_bios_param,
>>> .this_id = -1,
>>> - .sg_tablesize = SG_ALL,
>>> + .sg_tablesize = HISI_SAS_SGE_PAGE_CNT,
>>> .max_sectors = SCSI_DEFAULT_MAX_SECTORS,
>>> .use_clustering = ENABLE_CLUSTERING,
>>> .eh_device_reset_handler = sas_eh_device_reset_handler,
>>> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
>>> b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
>>> index 7e2b020..8a08078 100644
>>> --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
>>> +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
>>> @@ -2224,7 +2224,7 @@ struct device_attribute *host_attrs_v3_hw[] = {
>>> .change_queue_depth = sas_change_queue_depth,
>>> .bios_param = sas_bios_param,
>>> .this_id = -1,
>>> - .sg_tablesize = SG_ALL,
>>> + .sg_tablesize = HISI_SAS_SGE_PAGE_CNT,
>>> .max_sectors = SCSI_DEFAULT_MAX_SECTORS,
>>> .use_clustering = ENABLE_CLUSTERING,
>>> .eh_device_reset_handler = sas_eh_device_reset_handler,
>>> @@ -2366,7 +2366,6 @@ struct device_attribute *host_attrs_v3_hw[] = {
>>> shost->max_lun = ~0;
>>> shost->max_channel = 1;
>>> shost->max_cmd_len = 16;
>>> - shost->sg_tablesize = min_t(u16, SG_ALL, HISI_SAS_SGE_PAGE_CNT);
>>> shost->can_queue = hisi_hba->hw->max_command_entries -
>>> HISI_SAS_RESERVED_IPTT_CNT;
>>> shost->cmd_per_lun = hisi_hba->hw->max_command_entries -
>>>
>>
>>
>
>
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