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From: "Rafał Kozik" <rk@semihalf.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: dev@dpdk.org, "Marcin Wojtas" <mw@semihalf.com>,
	"Michał Krawczyk" <mk@semihalf.com>,
	"Tzalik, Guy" <gtzalik@amazon.com>,
	"Schmeilin, Evgeny" <evgenys@amazon.com>,
	"Matushevsky, Alexander" <matua@amazon.com>,
	"Chauskin, Igor" <igorch@amazon.com>
Subject: Re: [dpdk-dev] [PATCH 3/4] eal: enable WC during resources mapping
Date: Thu, 28 Jun 2018 15:06:03 +0200	[thread overview]
Message-ID: <CAMG3L4-aefEmdMsjyBAPXZ6Pu1C14z5fWOtE4dscqxv4Nk_RgQ@mail.gmail.com> (raw)
In-Reply-To: <ae94ef39-05f9-92d7-a36b-a52c93d1e223@intel.com>

2018-06-27 18:41 GMT+02:00 Ferruh Yigit <ferruh.yigit@intel.com>:
> On 4/11/2018 3:07 PM, Rafal Kozik wrote:
>> Write combining (wc) increase NIC performenca by making better
>> utilization of PCI bus, but cannot be used by all PMD.
>>
>> It will be enable only if RTE_PCI_DRV_WC_ACTIVATE will be set in
>> drivers flags. For proper work also igb driver must be loaded with
>> wc_activate set to 1.
>>
>> When mapping PCI resources firstly try to us wc.
>> If it is not supported it will fallback to normal mode.
>>
>> Signed-off-by: Rafal Kozik <rk@semihalf.com>
>> ---
>>  drivers/bus/pci/linux/pci_uio.c | 39 ++++++++++++++++++++++++++++-----------
>>  drivers/bus/pci/rte_bus_pci.h   |  2 ++
>>  2 files changed, 30 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/bus/pci/linux/pci_uio.c b/drivers/bus/pci/linux/pci_uio.c
>> index d423e4b..a1570c9 100644
>> --- a/drivers/bus/pci/linux/pci_uio.c
>> +++ b/drivers/bus/pci/linux/pci_uio.c
>> @@ -287,17 +287,14 @@ pci_uio_map_resource_by_index(struct rte_pci_device *dev, int res_idx,
>>       void *mapaddr;
>>       struct rte_pci_addr *loc;
>>       struct pci_map *maps;
>> +     int wc_activate = 0;
>> +
>> +     if (dev->driver != NULL)
>> +             wc_activate = dev->driver->drv_flags & RTE_PCI_DRV_WC_ACTIVATE;
>>
>>       loc = &dev->addr;
>>       maps = uio_res->maps;
>>
>> -     /* update devname for mmap  */
>> -     snprintf(devname, sizeof(devname),
>> -                     "%s/" PCI_PRI_FMT "/resource%d",
>> -                     rte_pci_get_sysfs_path(),
>> -                     loc->domain, loc->bus, loc->devid,
>> -                     loc->function, res_idx);
>> -
>>       /* allocate memory to keep path */
>>       maps[map_idx].path = rte_malloc(NULL, strlen(devname) + 1, 0);
>>       if (maps[map_idx].path == NULL) {
>> @@ -309,11 +306,31 @@ pci_uio_map_resource_by_index(struct rte_pci_device *dev, int res_idx,
>>       /*
>>        * open resource file, to mmap it
>>        */
>> -     fd = open(devname, O_RDWR);
>> -     if (fd < 0) {
>> -             RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
>> +     if (wc_activate) {
>> +             /* update devname for mmap  */
>> +             snprintf(devname, sizeof(devname),
>> +                     "%s/" PCI_PRI_FMT "/resource%d_wc",
>> +                     rte_pci_get_sysfs_path(),
>> +                     loc->domain, loc->bus, loc->devid,
>> +                     loc->function, res_idx);
>> +
>> +             fd = open(devname, O_RDWR);
>> +     }
>> +
>> +     if (!wc_activate || fd < 0) {
>
> "fd" may be used uninitialized here, although its value doesn't affect the
> branch taken it can be good to initialize it for any possible static analyzer
> warning.
>

I will fix it in new, rebased patch set.

>> +             snprintf(devname, sizeof(devname),
>> +                     "%s/" PCI_PRI_FMT "/resource%d",
>> +                     rte_pci_get_sysfs_path(),
>> +                     loc->domain, loc->bus, loc->devid,
>> +                     loc->function, res_idx);
>> +
>> +             /* then try to map resource file */
>> +             fd = open(devname, O_RDWR);
>> +             if (fd < 0) {
>> +                     RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
>>                               devname, strerror(errno));
>> -             goto error;
>> +                     goto error;
>> +             }
>>       }
>>
>>       /* try mapping somewhere close to the end of hugepages */
>> diff --git a/drivers/bus/pci/rte_bus_pci.h b/drivers/bus/pci/rte_bus_pci.h
>> index 357afb9..b7bcce3 100644
>> --- a/drivers/bus/pci/rte_bus_pci.h
>> +++ b/drivers/bus/pci/rte_bus_pci.h
>> @@ -132,6 +132,8 @@ struct rte_pci_bus {
>>
>>  /** Device needs PCI BAR mapping (done with either IGB_UIO or VFIO) */
>>  #define RTE_PCI_DRV_NEED_MAPPING 0x0001
>> +/** Device needs PCI BAR mapping with enabled write combining (wc) */
>> +#define RTE_PCI_DRV_WC_ACTIVATE 0x0002
>>  /** Device driver supports link state interrupt */
>>  #define RTE_PCI_DRV_INTR_LSC 0x0008
>>  /** Device driver supports device removal interrupt */
>>
>

  reply	other threads:[~2018-06-28 13:06 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-11 14:07 [dpdk-dev] [PATCH 0/4] support for write combining Rafal Kozik
2018-04-11 14:07 ` [dpdk-dev] [PATCH 1/4] igb_uio: add wc option Rafal Kozik
2018-06-27 16:34   ` Ferruh Yigit
2018-06-28 13:08     ` Rafał Kozik
2018-06-28 13:15       ` [dpdk-dev] [PATCH v2 0/4] support for write combining Rafal Kozik
2018-06-28 13:15         ` [dpdk-dev] [PATCH v2 1/4] igb_uio: add wc option Rafal Kozik
2018-06-28 14:32           ` Ferruh Yigit
2018-06-29  8:35             ` Rafał Kozik
2018-06-29 10:08               ` Ferruh Yigit
2018-06-29 10:24           ` [dpdk-dev] [PATCH v3 0/4] support for write combining Rafal Kozik
2018-06-29 10:24             ` [dpdk-dev] [PATCH v3 1/4] igb_uio: add wc option Rafal Kozik
2018-06-29 10:53               ` Ferruh Yigit
2018-06-29 12:17               ` [dpdk-dev] [PATCH v4 0/4] Support for write combining Rafal Kozik
2018-06-29 12:17                 ` [dpdk-dev] [PATCH v4 1/4] igb_uio: add wc option Rafal Kozik
2018-06-29 13:11                   ` Rafał Kozik
2018-06-29 13:20                   ` Ferruh Yigit
2018-06-29 13:40                   ` Ferruh Yigit
2018-06-29 12:17                 ` [dpdk-dev] [PATCH v4 2/4] bus/pci: reference driver structure Rafal Kozik
2018-06-29 12:17                 ` [dpdk-dev] [PATCH v4 3/4] eal: enable WC during resources mapping Rafal Kozik
2018-06-29 12:17                 ` [dpdk-dev] [PATCH v4 4/4] net/ena: enable WC Rafal Kozik
2018-06-29 13:54               ` [dpdk-dev] [PATCH v5 0/4] Support for write combining Rafal Kozik
2018-06-29 13:54                 ` [dpdk-dev] [PATCH v5 1/4] igb_uio: add wc option Rafal Kozik
2018-06-29 13:54                 ` [dpdk-dev] [PATCH v5 2/4] bus/pci: reference driver structure Rafal Kozik
2018-06-29 13:54                 ` [dpdk-dev] [PATCH v5 3/4] eal: enable WC during resources mapping Rafal Kozik
2018-06-29 13:54                 ` [dpdk-dev] [PATCH v5 4/4] net/ena: enable WC Rafal Kozik
2018-06-29 14:26                 ` [dpdk-dev] [PATCH v5 0/4] Support for write combining Ferruh Yigit
2018-06-29 22:13                   ` Thomas Monjalon
2018-06-29 10:24             ` [dpdk-dev] [PATCH v3 2/4] bus/pci: reference driver structure Rafal Kozik
2018-06-29 10:24             ` [dpdk-dev] [PATCH v3 3/4] eal: enable WC during resources mapping Rafal Kozik
2018-06-29 10:24             ` [dpdk-dev] [PATCH v3 4/4] net/ena: enable WC Rafal Kozik
2018-06-28 13:15         ` [dpdk-dev] [PATCH v2 2/4] bus/pci: reference driver structure Rafal Kozik
2018-06-28 13:15         ` [dpdk-dev] [PATCH v2 3/4] eal: enable WC during resources mapping Rafal Kozik
2018-06-28 14:50           ` Ferruh Yigit
2018-06-29  8:58             ` Rafał Kozik
2018-06-29  9:05               ` Ferruh Yigit
2018-06-29 10:28                 ` Rafał Kozik
2018-06-29 10:37                   ` Ferruh Yigit
2018-06-28 13:15         ` [dpdk-dev] [PATCH v2 4/4] net/ena: enable WC Rafal Kozik
2018-07-02  6:52           ` Michał Krawczyk
2018-04-11 14:07 ` [dpdk-dev] [PATCH 2/4] bus/pci: reference driver structure Rafal Kozik
2018-06-27 16:36   ` Ferruh Yigit
2018-06-28 13:05     ` Rafał Kozik
2018-04-11 14:07 ` [dpdk-dev] [PATCH 3/4] eal: enable WC during resources mapping Rafal Kozik
2018-06-27 16:41   ` Ferruh Yigit
2018-06-28 13:06     ` Rafał Kozik [this message]
2018-04-11 14:07 ` [dpdk-dev] [PATCH 4/4] net/ena: enable WC Rafal Kozik
2018-06-27 16:11   ` Thomas Monjalon
2018-06-28 13:04     ` Rafał Kozik
2018-04-11 14:42 ` [dpdk-dev] [PATCH 0/4] support for write combining Bruce Richardson
2018-04-16 11:36   ` Rafał Kozik
2018-04-27  8:27     ` Rafał Kozik
2018-04-27 11:30       ` Bruce Richardson
2018-04-30  8:07         ` Rafał Kozik
2018-04-30  8:58           ` Bruce Richardson

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