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Date: Thu, 26 Mar 2015 23:51:21 +0200
From: Vlad Zolotarov <vladz@...udius-systems.com>
To: "Tantilov, Emil S" <emil.s.tantilov@...el.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "avi@...udius-systems.com" <avi@...udius-systems.com>,
"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
"gleb@...udius-systems.com" <gleb@...udius-systems.com>
Subject: Re: [Intel-wired-lan] [PATCH net-next v1 1/2] ixgbe: Refactor the
RSS configuration code.
On 03/26/15 23:27, Tantilov, Emil S wrote:
>> -----Original Message-----
>> From: Vlad Zolotarov [mailto:vladz@...udius-systems.com]
>> Sent: Thursday, March 26, 2015 1:55 PM
>> To: Tantilov, Emil S; netdev@...r.kernel.org
>> Cc: avi@...udius-systems.com; intel-wired-lan@...ts.osuosl.org; gleb@...udius-systems.com
>> Subject: Re: [Intel-wired-lan] [PATCH net-next v1 1/2] ixgbe: Refactor the RSS configuration code.
>>
>>
>>
>> On 03/26/15 22:20, Tantilov, Emil S wrote:
>>>> -----Original Message-----
>>>> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...ts.osuosl.org] On Behalf Of Vlad Zolotarov
>>>> Sent: Thursday, March 26, 2015 10:57 AM
>>>> Subject: [Intel-wired-lan] [PATCH net-next v1 1/2] ixgbe: Refactor the RSS configuration code.
>>>>
>>>> This patch is a preparation for enablement of ethtool RSS indirection table
>>>> and hash key querying. We don't want to read registers every time the RSS info
>>>> is queried. Therefore we will store its current content in the
>>>> arrays in the adapter struct and will read it from there (instead of from
>>>> registers) when requested.
>>>>
>>>> Will change the code that writes the indirection table and hash key into the HW registers
>>>> to take its content from these arrays. This will also simplify the indirection
>>>> table updating ethtool callback implementation in the future.
>>>>
>>>> Signed-off-by: Vlad Zolotarov <vladz@...udius-systems.com>
>>>> ---
>>>> drivers/net/ethernet/intel/ixgbe/ixgbe.h | 2 +
>>>> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 143 ++++++++++++++++++--------
>>>> drivers/net/ethernet/intel/ixgbe/ixgbe_type.h | 7 ++
>>>> 3 files changed, 109 insertions(+), 43 deletions(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
>>>> index 5e44e48..402d182 100644
>>>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
>>>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
>>>> @@ -766,6 +766,8 @@ struct ixgbe_adapter {
>>>>
>>>> u8 default_up;
>>>> unsigned long fwd_bitmask; /* Bitmask indicating in use pools */
>>>> + u8 rss_indir_tbl[IXGBE_MAX_RETA_ENTRIES];
>>>> + u32 rss_key[IXGBE_RSS_KEY_SIZE / sizeof(u32)];
>>>> };
>>>>
>>>> static inline u8 ixgbe_max_rss_indices(struct ixgbe_adapter *adapter)
>>>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>>>> index 8853d52..e3de0c9 100644
>>>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>>>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
>>>> @@ -3228,51 +3228,54 @@ static void ixgbe_configure_srrctl(struct ixgbe_adapter *adapter,
>>>> IXGBE_WRITE_REG(hw, IXGBE_SRRCTL(reg_idx), srrctl);
>>>> }
>>>>
>>>> -static void ixgbe_setup_reta(struct ixgbe_adapter *adapter, const u32 *seed)
>>>> +/**
>>>> + * Return a number of entries in the RSS indirection table
>>> The preferred style for multiline comments is to not start with an empty "/*" checkpatch would generally
>>> catch those.
>> It's not a multi-line comment but a function description and its styling
>> is perfectly fine.
> Right - I replied under the wrong comment. There is however an old style comment that you moved that shows up in checkpatch.
>
>>>> + *
>>>> + * @adapter: device handle
>>>> + *
>>>> + * - 82598/82599/X540: 128
>>>> + * - X550(non-SRIOV mode): 512
>>>> + * - X550(SRIOV mode): 64
>>>> + */
>>>> +static u32 ixgbe_rss_indir_tbl_entries(struct ixgbe_adapter *adapter)
>>>> +{
>>>> + if (adapter->hw.mac.type < ixgbe_mac_X550)
>>>> + return 128;
>>>> + else if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
>>>> + return 64;
>>>> + else
>>>> + return 512;
>>>> +}
>>>> +
>>>> +/**
>>>> + * Write the RETA table to HW
>>>> + *
>>>> + * @adapter: device handle
>>>> + *
>>>> + * Write the RSS redirection table stored in adapter.rss_indir_tbl[] to HW.
>>>> + */
>>>> +static void ixgbe_store_reta(struct ixgbe_adapter *adapter)
>>> What is the point of having separate functions for writing the registers? Unless you intend to use
>>> them in other parts of the code, those can be folded inside ixgbe_setupvf/reta().
>> The one that is going to implement the ethtool -X is going to use it. ;)
> Alright that makes sense.
>
>>>> {
>>>> + u32 i, reta_entries = ixgbe_rss_indir_tbl_entries(adapter);
>>>> struct ixgbe_hw *hw = &adapter->hw;
>>>> u32 reta = 0;
>>>> - int i, j;
>>>> - int reta_entries = 128;
>>>> - u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
>>>> int indices_multi;
>>>> -
>>>> - /*
>>>> - * Program table for at least 2 queues w/ SR-IOV so that VFs can
>>>> - * make full use of any rings they may have. We will use the
>>>> - * PSRTYPE register to control how many rings we use within the PF.
>>>> - */
>>>> - if ((adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) && (rss_i < 2)) >
>>>> - rss_i = 2;
>>>> -
>>>> - /* Fill out hash function seeds */
>>>> - for (i = 0; i < 10; i++)
>>>> - IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), seed[i]);
>>>> + u8 *indir_tbl = adapter->rss_indir_tbl;
>>>>
>>>> /* Fill out the redirection table as follows:
>>>> - * 82598: 128 (8 bit wide) entries containing pair of 4 bit RSS indices
>>>> - * 82599/X540: 128 (8 bit wide) entries containing 4 bit RSS index
>>>> - * X550: 512 (8 bit wide) entries containing 6 bit RSS index
>>>> + * - 82598: 8 bit wide entries containing pair of 4 bit RSS
>>>> + * indices.
>>>> + * - 82599/X540: 8 bit wide entries containing 4 bit RSS index
>>>> + * - X550: 8 bit wide entries containing 6 bit RSS index
>>>> */
>>>> if (adapter->hw.mac.type == ixgbe_mac_82598EB)
>>>> indices_multi = 0x11;
>>>> else
>>>> indices_multi = 0x1;
>>>>
>>>> - switch (adapter->hw.mac.type) {
>>>> - case ixgbe_mac_X550:
>>>> - case ixgbe_mac_X550EM_x:
>>>> - if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED))
>>>> - reta_entries = 512;
>>>> - default:
>>>> - break;
>>>> - }
>>>> -
>>>> - /* Fill out redirection table */
>>>> - for (i = 0, j = 0; i < reta_entries; i++, j++) {
>>>> - if (j == rss_i)
>>>> - j = 0;
>>>> - reta = (reta << 8) | (j * indices_multi);
>>>> + /* Write redirection table to HW */
>>>> + for (i = 0; i < reta_entries; i++) {
>>>> + reta = (reta << 8) | (indices_multi * indir_tbl[i]);
>>>> if ((i & 3) == 3) {
>>>> if (i < 128)
>>>> IXGBE_WRITE_REG(hw, IXGBE_RETA(i >> 2), reta);
>>>> @@ -3283,34 +3286,88 @@ static void ixgbe_setup_reta(struct ixgbe_adapter *adapter, const u32 *seed)
>>>> }
>>>> }
>>>>
>>>> -static void ixgbe_setup_vfreta(struct ixgbe_adapter *adapter, const u32 *seed)
>>>> +/**
>>>> + * Write the RETA table to HW (for x550 devices in SRIOV mode)
>>>> + *
>>>> + * @adapter: device handle
>>>> + *
>>>> + * Write the RSS redirection table stored in adapter.rss_indir_tbl[] to HW.
>>>> + */
>>>> +static void ixgbe_store_vfreta(struct ixgbe_adapter *adapter)
>>>> {
>>>> + u32 i, reta_entries = ixgbe_rss_indir_tbl_entries(adapter);
>>>> struct ixgbe_hw *hw = &adapter->hw;
>>>> u32 vfreta = 0;
>>>> + unsigned int pf_pool = adapter->num_vfs;
>>>> +
>>>> + /* Write redirection table to HW */
>>>> + for (i = 0; i < reta_entries; i++) {
>>>> + vfreta = (vfreta << 8) | adapter->rss_indir_tbl[i];
>>>> + if ((i & 3) == 3)
>>>> + IXGBE_WRITE_REG(hw, IXGBE_PFVFRETA(i >> 2, pf_pool),
>>>> + vfreta);
>>>> + }
>>>> +}
>>>> +
>>>> +static void ixgbe_setup_reta(struct ixgbe_adapter *adapter)
>>>> +{
>>>> + struct ixgbe_hw *hw = &adapter->hw;
>>>> + u32 i, j;
>>>> + u32 reta_entries = ixgbe_rss_indir_tbl_entries(adapter);
>>>> + u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
>>>> +
>>>> + /*
>>>> + * Program table for at least 2 queues w/ SR-IOV so that VFs can
>>>> + * make full use of any rings they may have. We will use the
>>>> + * PSRTYPE register to control how many rings we use within the PF.
>>>> + */
> This one.
I saw this warning but it wasn't me who wrote this comment so it didn't
feel right to fix it in the functional patch. U know what, I'll fix it
in order to silence the checkpatch.
>
>>>> + if ((adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) && (rss_i < 2))
>>>> + rss_i = 2;
>>>> +
>>>> + /* Fill out hash function seeds */
>>>> + for (i = 0; i < 10; i++)
>>>> + IXGBE_WRITE_REG(hw, IXGBE_RSSRK(i), adapter->rss_key[i]);
>>>> +
>>>> + /* Fill out redirection table */
>>>> + memset(adapter->rss_indir_tbl, 0, sizeof(adapter->rss_indir_tbl));
>>>> +
>>>> + for (i = 0, j = 0; i < reta_entries; i++, j++) {
>>>> + if (j == rss_i)
>>>> + j = 0;
>>>> +
>>>> + adapter->rss_indir_tbl[i] = j;
>>>> + }
>>>> +
>>>> + ixgbe_store_reta(adapter);
>>>> +}
>>>> +
>>>> +static void ixgbe_setup_vfreta(struct ixgbe_adapter *adapter)
>>>> +{
>>>> + struct ixgbe_hw *hw = &adapter->hw;
>>>> u16 rss_i = adapter->ring_feature[RING_F_RSS].indices;
>>>> unsigned int pf_pool = adapter->num_vfs;
>>>> int i, j;
>>>>
>>>> /* Fill out hash function seeds */
>>>> for (i = 0; i < 10; i++)
>>>> - IXGBE_WRITE_REG(hw, IXGBE_PFVFRSSRK(i, pf_pool), seed[i]);
>>>> + IXGBE_WRITE_REG(hw, IXGBE_PFVFRSSRK(i, pf_pool),
>>>> + adapter->rss_key[i]);
>>>>
>>>> /* Fill out the redirection table */
>>>> for (i = 0, j = 0; i < 64; i++, j++) {
>>>> if (j == rss_i)
>>>> j = 0;
>>>> - vfreta = (vfreta << 8) | j;
>>>> - if ((i & 3) == 3)
>>>> - IXGBE_WRITE_REG(hw, IXGBE_PFVFRETA(i >> 2, pf_pool),
>>>> - vfreta);
>>>> +
>>>> + adapter->rss_indir_tbl[i] = j;
>>>> }
>>>> +
>>>> + ixgbe_store_vfreta(adapter);
>>>> }
>>>>
>>>> static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
>>>> {
>>>> struct ixgbe_hw *hw = &adapter->hw;
>>>> u32 mrqc = 0, rss_field = 0, vfmrqc = 0;
>>>> - u32 rss_key[10];
>>>> u32 rxcsum;
>>>>
>>>> /* Disable indicating checksum in descriptor, enables RSS hash */
>>>> @@ -3354,7 +3411,7 @@ static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
>>>> if (adapter->flags2 & IXGBE_FLAG2_RSS_FIELD_IPV6_UDP)
>>>> rss_field |= IXGBE_MRQC_RSS_FIELD_IPV6_UDP;
>>>>
>>>> - netdev_rss_key_fill(rss_key, sizeof(rss_key));
>>>> + netdev_rss_key_fill(adapter->rss_key, sizeof(adapter->rss_key));
>>>> if ((hw->mac.type >= ixgbe_mac_X550) &&
>>>> (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) {
>>>> unsigned int pf_pool = adapter->num_vfs;
>>>> @@ -3364,12 +3421,12 @@ static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter)
>>>> IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
>>>>
>>>> /* Setup RSS through the VF registers */
>>>> - ixgbe_setup_vfreta(adapter, rss_key);
>>>> + ixgbe_setup_vfreta(adapter);
>>>> vfmrqc = IXGBE_MRQC_RSSEN;
>>>> vfmrqc |= rss_field;
>>>> IXGBE_WRITE_REG(hw, IXGBE_PFVFMRQC(pf_pool), vfmrqc);
>>>> } else {
>>>> - ixgbe_setup_reta(adapter, rss_key);
>>>> + ixgbe_setup_reta(adapter);
>>>> mrqc |= rss_field;
>>>> IXGBE_WRITE_REG(hw, IXGBE_MRQC, mrqc);
>>>> }
>>>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
>>>> index c3ddc94..0c671b1 100644
>>>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
>>>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h>
>>>> @@ -311,6 +311,13 @@ struct ixgbe_thermal_sensor_data {
>>>> #define IXGBE_ERETA(_i) (0x0EE80 + ((_i) * 4)) /* 96 of these (0-95) */
>>>> #define IXGBE_RSSRK(_i) (0x05C80 + ((_i) * 4)) /* 10 of these (0-9) */
>>>>
>>>> +/* maximum number of RETA entries among all devices supported by ixgbe
>>>> + * driver: currently it's x550 device in non-SRIOV mode
>>>> + */
>>>> +#define IXGBE_MAX_RETA_ENTRIES 512
>>>> +
>>>> +#define IXGBE_RSS_KEY_SIZE 40 /* size of RSS Hash Key in bytes */
>>>> +
>>> These defines should be in ixgbe.h
>> Why? These are HW related macros and IMHO they belong to ixgbe_type.h
>> with other HW related macros and not to ixgbe.h where SW related macros are.
> These are just size/limits defines and we keep many of those in ixgbe.h.
These are HW sizes/limits.
> If it happens that we need them in the files that deal strictly with HW then it probably makes sense to have them in ixgbe_type.h, but I don't see this being the case here.
That's a strange strategy to separate the values not by their nature but
by the nature of their usage but whatever... I'll move it to ixgbe.h in v2.
>
> Thanks,
> Emil
>
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