[dpdk-dev] [PATCH v7 1/7] ethdev: add set ptype function
Andrew Rybchenko
arybchenko at solarflare.com
Wed Oct 2 15:41:19 CEST 2019
On 10/2/19 4:37 PM, Andrew Rybchenko wrote:
> Hi,
>
> looks good, just few comments below.
>
> Many thanks for working on it,
> Andrew.
>
> On 10/2/19 6:47 AM, pbhagavatula at marvell.com wrote:
>> From: Pavan Nikhilesh <pbhagavatula at marvell.com>
>>
>> Add `rte_eth_dev_set_supported_ptypes` function that will allow the
>> application to inform the PMD the packet types it is interested in.
>> Based on the ptypes set PMDs can optimize their Rx path.
>>
>> -If application doesn’t want any ptype information it can call
>> `rte_eth_dev_set_supported_ptypes(ethdev_id, RTE_PTYPE_UNKNOWN, NULL,
>> 0)`
>> and PMD may skip packet type processing and set rte_mbuf::packet_type to
>> RTE_PTYPE_UNKNOWN.
>>
>> -If application doesn’t call `rte_eth_dev_set_supported_ptypes` PMD can
>> return `rte_mbuf::packet_type` with `rte_eth_dev_get_supported_ptypes`.
>>
>> -If application is interested only in L2/L3 layer, it can inform the PMD
>> to update `rte_mbuf::packet_type` with L2/L3 ptype by calling
>> `rte_eth_dev_set_supported_ptypes(ethdev_id,
>> RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK, NULL, 0)`.
>>
>> Suggested-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
>> Signed-off-by: Pavan Nikhilesh <pbhagavatula at marvell.com>
>
> [snip]
>
>> diff --git a/lib/librte_ethdev/rte_ethdev.c
>> b/lib/librte_ethdev/rte_ethdev.c
>> index 17d183e1f..b1588fe7a 100644
>> --- a/lib/librte_ethdev/rte_ethdev.c
>> +++ b/lib/librte_ethdev/rte_ethdev.c
>> @@ -2602,6 +2602,56 @@ rte_eth_dev_get_supported_ptypes(uint16_t
>> port_id, uint32_t ptype_mask,
>> return j;
>> }
>> +int
>> +rte_eth_dev_set_supported_ptypes(uint16_t port_id, uint32_t ptype_mask,
>> + uint32_t *set_ptypes, unsigned int num)
>> +{
>> + unsigned int i, j;
>> + struct rte_eth_dev *dev;
>> + const uint32_t *all_ptypes;
>> +
>> + RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
>> + dev = &rte_eth_devices[port_id];
>> + RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_supported_ptypes_get, 0);
>> + RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_supported_ptypes_set, 0);
>
> When 0 is returned above, we should set set_ptypes. So, below
> check num vs set_types should be done before callbacks check and
> I think it is OK to do
> set_ptypes[0] = RTE_PTYPE_UNKNOWN;
of course if num > 0
> just after the check. It will allow to simplify code below and will
> make it set correctly even if 0 returned because of no callbacks.
>
>> +
>> + if (num > 0 && set_ptypes == NULL)
>> + return -EINVAL;
>> +
>> + if (ptype_mask == 0) {
>> + if (num > 0)
>> + set_ptypes[0] = RTE_PTYPE_UNKNOWN;
>> +
>> + return (*dev->dev_ops->dev_supported_ptypes_set)(dev,
>> + ptype_mask);
>> + }
>> +
>> + all_ptypes = (*dev->dev_ops->dev_supported_ptypes_get)(dev);
>> + if (all_ptypes == NULL) {
>> + if (num > 0)
>> + set_ptypes[0] = RTE_PTYPE_UNKNOWN;
>> +
>> + return 0;
>> + }
>> +
>> + for (i = 0, j = 0; set_ptypes != NULL &&
>> + (all_ptypes[i] != RTE_PTYPE_UNKNOWN); ++i) {
>> + if (ptype_mask & all_ptypes[i]) {
>> + if (j < num - 1) {
>> + set_ptypes[j] = all_ptypes[i];
>> + j++;
>> + continue;
>> + }
>> + break;
>
> I'd like to repeat my question about insufficient space to return
> set_ptypes. Do we need to signal it somehow? If no, it should be
> explained why in the comments here.
>
>> + }
>> + }
>> +
>> + if (set_ptypes != NULL)
>> + set_ptypes[j] = RTE_PTYPE_UNKNOWN;
>> +
>> + return (*dev->dev_ops->dev_supported_ptypes_set)(dev, ptype_mask);
>> +}
>> +
>> void
>> rte_eth_macaddr_get(uint16_t port_id, struct rte_ether_addr *mac_addr)
>> {
>> diff --git a/lib/librte_ethdev/rte_ethdev.h
>> b/lib/librte_ethdev/rte_ethdev.h
>> index d9871782e..c577a9172 100644
>> --- a/lib/librte_ethdev/rte_ethdev.h
>> +++ b/lib/librte_ethdev/rte_ethdev.h
>> @@ -2431,6 +2431,42 @@ int rte_eth_dev_fw_version_get(uint16_t port_id,
>> */
>> int rte_eth_dev_get_supported_ptypes(uint16_t port_id, uint32_t
>> ptype_mask,
>> uint32_t *ptypes, int num);
>> +/**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change without prior notice.
>> + *
>> + * Inform Ethernet device of the packet types classification in which
>> + * the recipient is interested.
>> + *
>> + * Application can use this function to set only specific ptypes
>> that it's
>> + * interested. This information can be used by the PMD to optimize
>> Rx path.
>> + *
>> + * The function accepts an array `set_ptypes` allocated by the
>> caller to
>> + * store the packet types set by the driver, the last element of the
>> array
>> + * is set to RTE_PTYPE_UNKNOWN. The size of the `set_ptype` array
>> should be
>> + * `rte_eth_dev_get_supported_ptypes() + 1` else it might only be
>> filled
>> + * partially.
>> + *
>> + * @param port_id
>> + * The port identifier of the Ethernet device.
>> + * @param ptype_mask
>> + * The ptype family that application is interested in.
>> + * @param set_ptypes
>> + * An array pointer to store set packet types, allocated by
>> caller. The
>> + * function marks the end of array with RTE_PTYPE_UNKNOWN.
>> + * @param num
>> + * Size of the array pointed by param ptypes.
>> + * Should be rte_eth_dev_get_supported_ptypes() + 1 to accommodate
>> the
>> + * set ptypes.
>> + * @return
>> + * - (0) if Success.
>> + * - (-ENODEV) if *port_id* invalid.
>> + * - (-EINVAL) if *ptype_mask* is invalid (or) set_ptypes is NULL and
>> + * num > 0.
>> + */
>> +__rte_experimental
>> +int rte_eth_dev_set_supported_ptypes(uint16_t port_id, uint32_t
>> ptype_mask,
>> + uint32_t *set_ptypes, unsigned int num);
>> /**
>> * Retrieve the MTU of an Ethernet device.
>> diff --git a/lib/librte_ethdev/rte_ethdev_core.h
>> b/lib/librte_ethdev/rte_ethdev_core.h
>> index 2922d5b7c..93bc34480 100644
>> --- a/lib/librte_ethdev/rte_ethdev_core.h
>> +++ b/lib/librte_ethdev/rte_ethdev_core.h
>> @@ -110,6 +110,10 @@ typedef void (*eth_dev_infos_get_t)(struct
>> rte_eth_dev *dev,
>> typedef const uint32_t *(*eth_dev_supported_ptypes_get_t)(struct
>> rte_eth_dev *dev);
>> /**< @internal Get supported ptypes of an Ethernet device. */
>> +typedef uint32_t (*eth_dev_supported_ptypes_set_t)(struct
>> rte_eth_dev *dev,
>> + uint32_t ptype_mask);
>> +/**< @internal Inform device about packet types in which the
>> recipient is interested. */
>> +
>
> Please, take a look at promiscuous mode callback and let's put
> more verbose description here which better document interface
> to drivers. I think ptyep_mask description should refer to corresponding
> defines to be used.
>
> [snip]
>
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