From: Andrew Rybchenko <arybchenko@solarflare.com>
To: Stephen Hemminger <stephen@networkplumber.org>, <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v8 09/15] net/sfc: use new rte_eth_linkstatus functions
Date: Fri, 26 Jan 2018 09:31:03 +0300 [thread overview]
Message-ID: <45212c67-c9b9-76e1-834f-0873635cf298@solarflare.com> (raw)
In-Reply-To: <20180126020151.979-10-stephen@networkplumber.org>
On 01/26/2018 05:01 AM, Stephen Hemminger wrote:
> Use the new API rte_eth_linkstatus_set to handle link status update.
>
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
> drivers/net/sfc/sfc_ethdev.c | 24 +++++-------------------
> drivers/net/sfc/sfc_ev.c | 20 ++------------------
> 2 files changed, 7 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/net/sfc/sfc_ethdev.c b/drivers/net/sfc/sfc_ethdev.c
> index 89a452907621..7d51db979a03 100644
> --- a/drivers/net/sfc/sfc_ethdev.c
> +++ b/drivers/net/sfc/sfc_ethdev.c
> @@ -236,22 +236,13 @@ static int
> sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
> {
> struct sfc_adapter *sa = dev->data->dev_private;
> - struct rte_eth_link *dev_link = &dev->data->dev_link;
> - struct rte_eth_link old_link;
> struct rte_eth_link current_link;
> + int ret;
>
> sfc_log_init(sa, "entry");
>
> -retry:
> - EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
> - *(int64_t *)&old_link = rte_atomic64_read((rte_atomic64_t *)dev_link);
> -
> if (sa->state != SFC_ADAPTER_STARTED) {
> sfc_port_link_mode_to_info(EFX_LINK_UNKNOWN, ¤t_link);
> - if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> - *(uint64_t *)&old_link,
> - *(uint64_t *)¤t_link))
> - goto retry;
> } else if (wait_to_complete) {
> efx_link_mode_t link_mode;
>
> @@ -259,21 +250,16 @@ sfc_dev_link_update(struct rte_eth_dev *dev, int wait_to_complete)
> link_mode = EFX_LINK_UNKNOWN;
> sfc_port_link_mode_to_info(link_mode, ¤t_link);
>
> - if (!rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> - *(uint64_t *)&old_link,
> - *(uint64_t *)¤t_link))
> - goto retry;
> } else {
> sfc_ev_mgmt_qpoll(sa);
> - *(int64_t *)¤t_link =
> - rte_atomic64_read((rte_atomic64_t *)dev_link);
> + rte_eth_linkstatus_get(dev, ¤t_link);
> }
>
> - if (old_link.link_status != current_link.link_status)
> + ret = rte_eth_linkstatus_set(dev, ¤t_link);
> + if (ret == 0)
> sfc_info(sa, "Link status is %s",
> current_link.link_status ? "UP" : "DOWN");
> -
> - return old_link.link_status == current_link.link_status ? 0 : -1;
> + return ret;
> }
>
> static void
These changes are OK.
> diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
> index 7abe61ae5ff1..273a92ccb222 100644
> --- a/drivers/net/sfc/sfc_ev.c
> +++ b/drivers/net/sfc/sfc_ev.c
> @@ -382,27 +382,11 @@ sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
> {
> struct sfc_evq *evq = arg;
> struct sfc_adapter *sa = evq->sa;
> - struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
> struct rte_eth_link new_link;
> - uint64_t new_link_u64;
> - uint64_t old_link_u64;
> -
> - EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
>
> sfc_port_link_mode_to_info(link_mode, &new_link);
> -
> - new_link_u64 = *(uint64_t *)&new_link;
> - do {
> - old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
> - if (old_link_u64 == new_link_u64)
> - break;
> -
> - if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
> - old_link_u64, new_link_u64)) {
> - evq->sa->port.lsc_seq++;
> - break;
> - }
> - } while (B_TRUE);
> + if (rte_eth_linkstatus_set(sa->eth_dev, &new_link))
> + evq->sa->port.lsc_seq++;
>
> return B_FALSE;
> }
Let me repeat part of my review notes for v4:
>>
lsc_seq should be incremented in the case of any changes in link,
not up/down changes only and it should be preserved.
<<
and I'd like to keep it here. Thanks to rte_atomic64_exchange()
the function can be simplified to:
- convert link mode to link info (as now)
- do exchange
- compare old and new value as uint64_t and increment lsc_seq
if different
Thanks.
next prev parent reply other threads:[~2018-01-26 6:31 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-26 2:01 [dpdk-dev] [PATCH v8 00/15] common linkstatus functions Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 01/15] eal: introduce atomic exchange operation Stephen Hemminger
2018-01-26 17:14 ` Thomas Monjalon
2018-01-26 17:24 ` Bruce Richardson
2018-01-26 21:54 ` Stephen Hemminger
2018-01-29 9:51 ` Bruce Richardson
2018-01-26 17:59 ` Ananyev, Konstantin
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 02/15] ethdev: add linkstatus get/set helper functions Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 03/15] net/virtio: use eth_linkstatus_set Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 04/15] net/vmxnet3: use rte_eth_linkstatus_set Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 05/15] net/dpaa2: " Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 06/15] net/nfp: use rte_eth_linkstatus functions Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 07/15] net/e1000: use rte_eth_linkstatus helpers Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 08/15] net/ixgbe: use rte_eth_linkstatus functions Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 09/15] net/sfc: use new " Stephen Hemminger
2018-01-26 6:31 ` Andrew Rybchenko [this message]
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 10/15] net/i40e: use " Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 11/15] net/liquidio: use rte_eth_linkstatus_set Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 12/15] net/thunderx: " Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 13/15] net/szedata: use _rte_eth_linkstatus_set Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 14/15] net/octeontx: use rte_eth_linkstatus_set Stephen Hemminger
2018-01-26 2:01 ` [dpdk-dev] [PATCH v8 15/15] net/enic: " Stephen Hemminger
2018-03-15 17:38 ` [dpdk-dev] [PATCH v8 00/15] common linkstatus functions Ferruh Yigit
2018-03-16 10:31 ` Ferruh Yigit
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