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Date:   Fri, 12 Feb 2021 19:35:50 -0600
From:   Alex Elder <elder@...e.org>
To:     Alexander Duyck <alexander.duyck@...il.com>,
        Alex Elder <elder@...aro.org>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, elder@...nel.org,
        evgreen@...omium.org, bjorn.andersson@...aro.org,
        cpratapa@...eaurora.org,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 net-next 4/5] net: ipa: introduce
 ipa_table_hash_support()

On 2/12/21 7:05 PM, Alexander Duyck wrote:
> On Fri, Feb 12, 2021 at 6:40 AM Alex Elder <elder@...aro.org> wrote:
>>
>> Introduce a new function to abstract the knowledge of whether hashed
>> routing and filter tables are supported for a given IPA instance.
>>
>> IPA v4.2 is the only one that doesn't support hashed tables (now
>> and for the foreseeable future), but the name of the helper function
>> is better for explaining what's going on.
>>
>> Signed-off-by: Alex Elder <elder@...aro.org>
>> ---
>> v2: - Update copyrights.
>>
>>   drivers/net/ipa/ipa_cmd.c   |  2 +-
>>   drivers/net/ipa/ipa_table.c | 16 +++++++++-------
>>   drivers/net/ipa/ipa_table.h |  8 +++++++-
>>   3 files changed, 17 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
>> index fd8bf6468d313..35e35852c25c5 100644
>> --- a/drivers/net/ipa/ipa_cmd.c
>> +++ b/drivers/net/ipa/ipa_cmd.c
>> @@ -268,7 +268,7 @@ static bool ipa_cmd_register_write_valid(struct ipa *ipa)
>>          /* If hashed tables are supported, ensure the hash flush register
>>           * offset will fit in a register write IPA immediate command.
>>           */
>> -       if (ipa->version != IPA_VERSION_4_2) {
>> +       if (ipa_table_hash_support(ipa)) {
>>                  offset = ipa_reg_filt_rout_hash_flush_offset(ipa->version);
>>                  name = "filter/route hash flush";
>>                  if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
>> diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c
>> index 32e2d3e052d55..baaab3dd0e63c 100644
>> --- a/drivers/net/ipa/ipa_table.c
>> +++ b/drivers/net/ipa/ipa_table.c
>> @@ -1,7 +1,7 @@
>>   // SPDX-License-Identifier: GPL-2.0
>>
>>   /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
>> - * Copyright (C) 2018-2020 Linaro Ltd.
>> + * Copyright (C) 2018-2021 Linaro Ltd.
>>    */
>>
>>   #include <linux/types.h>
>> @@ -239,6 +239,11 @@ static void ipa_table_validate_build(void)
>>
>>   #endif /* !IPA_VALIDATE */
>>
>> +bool ipa_table_hash_support(struct ipa *ipa)
>> +{
>> +       return ipa->version != IPA_VERSION_4_2;
>> +}
>> +
> 
> Since this is only a single comparison it might make more sense to
> make this a static inline and place it in ipa.h. Otherwise you are
> just bloating the code up to jump to such a small function.

Static inline will duplicate the function everywhere also,
"bloating" it in another way (but it's a fairly trivial
amount of code either way).

Nevertheless I agree with your sentiment.  It's moot now
because the series was just accepted, but I'll keep it
in mind.

Thanks for your input.

					-Alex

>>   /* Zero entry count means no table, so just return a 0 address */
>>   static dma_addr_t ipa_table_addr(struct ipa *ipa, bool filter_mask, u16 count)
>>   {
>> @@ -412,8 +417,7 @@ int ipa_table_hash_flush(struct ipa *ipa)
>>          struct gsi_trans *trans;
>>          u32 val;
>>
>> -       /* IPA version 4.2 does not support hashed tables */
>> -       if (ipa->version == IPA_VERSION_4_2)
>> +       if (!ipa_table_hash_support(ipa))
>>                  return 0;
>>
>>          trans = ipa_cmd_trans_alloc(ipa, 1);
>> @@ -531,8 +535,7 @@ static void ipa_filter_config(struct ipa *ipa, bool modem)
>>          enum gsi_ee_id ee_id = modem ? GSI_EE_MODEM : GSI_EE_AP;
>>          u32 ep_mask = ipa->filter_map;
>>
>> -       /* IPA version 4.2 has no hashed route tables */
>> -       if (ipa->version == IPA_VERSION_4_2)
>> +       if (!ipa_table_hash_support(ipa))
>>                  return;
>>
>>          while (ep_mask) {
>> @@ -582,8 +585,7 @@ static void ipa_route_config(struct ipa *ipa, bool modem)
>>   {
>>          u32 route_id;
>>
>> -       /* IPA version 4.2 has no hashed route tables */
>> -       if (ipa->version == IPA_VERSION_4_2)
>> +       if (!ipa_table_hash_support(ipa))
>>                  return;
>>
>>          for (route_id = 0; route_id < IPA_ROUTE_COUNT_MAX; route_id++)
>> diff --git a/drivers/net/ipa/ipa_table.h b/drivers/net/ipa/ipa_table.h
>> index 78038d14fcea9..1a68d20f19d6a 100644
>> --- a/drivers/net/ipa/ipa_table.h
>> +++ b/drivers/net/ipa/ipa_table.h
>> @@ -1,7 +1,7 @@
>>   /* SPDX-License-Identifier: GPL-2.0 */
>>
>>   /* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
>> - * Copyright (C) 2019-2020 Linaro Ltd.
>> + * Copyright (C) 2019-2021 Linaro Ltd.
>>    */
>>   #ifndef _IPA_TABLE_H_
>>   #define _IPA_TABLE_H_
>> @@ -51,6 +51,12 @@ static inline bool ipa_filter_map_valid(struct ipa *ipa, u32 filter_mask)
>>
>>   #endif /* !IPA_VALIDATE */
>>
>> +/**
>> + * ipa_table_hash_support() - Return true if hashed tables are supported
>> + * @ipa:       IPA pointer
>> + */
>> +bool ipa_table_hash_support(struct ipa *ipa);
>> +
>>   /**
>>    * ipa_table_reset() - Reset filter and route tables entries to "none"
>>    * @ipa:       IPA pointer
> 
> Just define the function here and make it a static inline.
> 

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