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From: Shreyansh Jain <shreyansh.jain@nxp.com>
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Subject: Re: [dpdk-dev] [PATCH 24/38] net/dpaa: add support for Tx and Rx
queue setup
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X-List-Received-Date: Thu, 29 Jun 2017 14:46:17 -0000
On Wednesday 28 June 2017 09:15 PM, Ferruh Yigit wrote:
> On 6/16/2017 6:40 AM, Shreyansh Jain wrote:
>> Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>
>> Signed-off-by: Shreyansh Jain <shreyansh.jain@nxp.com>
>> ---
>> doc/guides/nics/features/dpaa.ini | 1 +
>> drivers/net/dpaa/Makefile | 4 +
>> drivers/net/dpaa/dpaa_ethdev.c | 279 ++++++++++++++++++++++++++++++++-
>> drivers/net/dpaa/dpaa_ethdev.h | 6 +
>> drivers/net/dpaa/dpaa_rxtx.c | 313 ++++++++++++++++++++++++++++++++++++++
>> drivers/net/dpaa/dpaa_rxtx.h | 61 ++++++++
>
> This patch adds initial rx/tx support, as well as rx/tx queue support as
> mentioned in patch subject.
>
> I would be for splitting patch, but even if patch not splitted, I would
> suggest updating patch suject and commit log to cover patch content.
Ok. I will fix this (splitting if possible, else update to commit).
>
> <...>
>> --- a/doc/guides/nics/features/dpaa.ini
>> +++ b/doc/guides/nics/features/dpaa.ini
>> @@ -4,5 +4,6 @@
>> ; Refer to default.ini for the full list of available PMD features.
>> ;
>> [Features]
>> +Queue start/stop = Y
>
> This requires following dev_ops implemented:
> rx_queue_start, rx_queue_stop, tx_queue_start, tx_queue_stop
Ok. My understanding here was wrong - I incorrectly matched this
to queue setup/teardown. I will remove this feature listing. (and
a couple more as per your review comment on other patches).
>
>> ARMv8 = Y
>> Usage doc = Y
>
> <...>
>
>> +
>> + /* Initialize Rx FQ's */
>> + if (getenv("DPAA_NUM_RX_QUEUES"))
>
> I think this was disscussed before, should a PMD get config options from
> enviroment variable? Altough this works, I am for a more explicit
> method, like dev_args.
Well, I do remember that discussion and still continued with it because
1) I am not done with that dev_args changes and 2) I think this is more
non-intrusive as this is specific to DPAA without need for expanding it
towards dev_args (and impacting application arg list).
You think this is no-go? If so, I will fix this.
>
> <...>
>> +
>> + dpaa_intf->rx_queues = rte_zmalloc(NULL,
>> + sizeof(struct qman_fq) * num_rx_fqs, MAX_CACHELINE);
>
> A NULL check perhaps?
>
> And if multi-process support desired, this should be done only for
> primary process.
I will fix both the above.
>
> <...>
>> + /* Allocate memory for storing MAC addresses */
>> + eth_dev->data->mac_addrs = rte_zmalloc("mac_addr",
>> + ETHER_ADDR_LEN * DPAA_MAX_MAC_FILTER, 0);
>> + if (eth_dev->data->mac_addrs == NULL) {
>> + PMD_INIT_LOG(ERR, "Failed to allocate %d bytes needed to "
>> + "store MAC addresses",
>> + ETHER_ADDR_LEN * DPAA_MAX_MAC_FILTER);
>
> Anything to cleanup before exit?
bad miss from my side. *_queues should be released - I will fix this. (I
will run some static analyzer and fix
any other similar before next version)
>
>> + return -ENOMEM;
>> + }
>
> <...>
>> +uint16_t dpaa_eth_queue_rx(void *q,
>> + struct rte_mbuf **bufs,
>> + uint16_t nb_bufs)
>> +{
>> + struct qman_fq *fq = q;
>> + struct qm_dqrr_entry *dq;
>> + uint32_t num_rx = 0, ifid = ((struct dpaa_if *)fq->dpaa_intf)->ifid;
>> + int ret;
>> +
>> + ret = rte_dpaa_portal_init((void *)0);
>> + if (ret) {
>> + PMD_DRV_LOG(ERR, "Failure in affining portal");
>> + return 0;
>> + }
>
> This is rx_pkt_burst function, right? Is it Ok to call
> rte_dpaa_portal_init() in Rx data path?
Yes, actually, a portal needs to be initialized if not already - for all
I/O operations to succeed.
rte_dpaa_portal_init segragates calls if multiple entries are made for
initialization.
rte_dpaa_portal_init
`-> _dpaa_portal_init() if not already initialized
>
> <...>
>> + buf = (uint64_t)rte_dpaa_mem_ptov(bufs.addr) - bp_info->meta_data_size;
>> + if (!buf)
>> + goto out;
>
> goto is not required here.
:) yes, I will remove this stupid miss.
>
>> +
>> +out:
>> + return (void *)buf;
>> +}
>> +
>
> <...>
>> +uint16_t dpaa_eth_tx_drop_all(void *q __rte_unused,
>> + struct rte_mbuf **bufs __rte_unused,
>> + uint16_t nb_bufs __rte_unused)
>> +{
>> + PMD_TX_LOG(DEBUG, "Drop all packets");
>
> Should mbufs freed here?
>
>> +
>> + /* Drop all incoming packets. No need to free packets here
>> + * because the rte_eth f/w frees up the packets through tx_buffer
>> + * callback in case this functions returns count less than nb_bufs
>> + */
Ah, actually I was banking on logic that in case a driver doesn't
release memory, the API caller (on getting less than nb_bufs) would do
that. This is case for stopped interface.
But, I agree, this is dirty fix. I will change this.
>> + return 0;
>> +}
>
> <...>
>
>