[dpdk-dev] [PATCH v5 00/15] common ethdev linkstatus functions

[Andrew Rybchenko]

On 01/16/2018 09:37 PM, Stephen Hemminger wrote:
> While reviewing drivers, noticed a lot of unnecessary
> duplication of code in drivers for handling the eth_dev link status
> information. While consolidating this, it also became obvious that
> some drivers behave differently for no good reason.
>
> It also was a good chance to introduce atomic exchange primitives
> in EAL because there are other places using cmpset where not
> necessary (such as bonding).
>
> Mostly only compile tested only, don't have all of the hardware
> available (except ixgbe and virtio) to test.
>
> Note: the eth_dev_link_update function return value is inconsistent
> across drivers. Should be changed to be void.

I would say "link_update" callback return value is inconsistent across
drivers. I'm not sure which direction is right here: make it consistent
or make it void. Also any changes in link information could be
important. As I understand it should not happen without up/down,
but bugs with loss of intermediate transitions are definitely possible.
So, notifying about any changes in link information is definitely safer.
May be not now.

>
> v5
>   - checkpatch whitespace cleanup
>
> v4
>   - incorporate review feedback
>   - rename _rte_linkstatus to rte_linkstatus
>   - change return value of _rte_linkstatus
>   - optimize get on 64bit platforms
>   - change return value of rte_linkstatus_set
>
> v3
>   - align rte_linkstatus_get with rte_atomic64_read
>   - virtio use ETH_SPEED_NUM_10G
>   - add net/
>
> v2
>   - function names changed
>   - rebased to current master
>
> Stephen Hemminger (15):
>    eal: introduce atomic exchange operation
>    ethdev: add linkstatus get/set helper functions
>    net/virtio: use eth_linkstatus_set
>    net/vmxnet3: use rte_eth_linkstatus_set
>    net/dpaa2: use rte_eth_linkstatus_set
>    net/nfp: use rte_eth_linkstatus functions
>    net/e1000: use rte_eth_linkstatus helpers
>    net/ixgbe: use rte_eth_linkstatus functions
>    net/sfc: use new rte_eth_linkstatus functions
>    net/i40e: use rte_eth_linkstatus functions
>    net/liquidio: use rte_eth_linkstatus_set
>    net/thunderx: use rte_eth_linkstatus_set
>    net/szedata: use _rte_eth_linkstatus_set
>    net/octeontx: use rte_eth_linkstatus_set
>    net/enic: use rte_eth_linkstatus_set
>
>   drivers/net/dpaa2/dpaa2_ethdev.c                   | 75 ++---------------
>   drivers/net/e1000/em_ethdev.c                      | 69 ++--------------
>   drivers/net/e1000/igb_ethdev.c                     | 70 ++--------------
>   drivers/net/enic/enic_ethdev.c                     |  5 +-
>   drivers/net/enic/enic_main.c                       | 17 ++--
>   drivers/net/i40e/i40e_ethdev.c                     | 43 ++--------
>   drivers/net/i40e/i40e_ethdev_vf.c                  | 18 +---
>   drivers/net/ixgbe/ixgbe_ethdev.c                   | 96 ++++------------------
>   drivers/net/liquidio/lio_ethdev.c                  | 53 ++----------
>   drivers/net/nfp/nfp_net.c                          | 77 ++---------------
>   drivers/net/octeontx/octeontx_ethdev.c             | 17 +---
>   drivers/net/sfc/sfc_ethdev.c                       | 21 +----
>   drivers/net/sfc/sfc_ev.c                           | 20 +----
>   drivers/net/szedata2/rte_eth_szedata2.c            | 19 ++---
>   drivers/net/thunderx/nicvf_ethdev.c                | 18 +---
>   drivers/net/virtio/virtio_ethdev.c                 | 65 +++------------
>   drivers/net/vmxnet3/vmxnet3_ethdev.c               | 86 ++++---------------
>   .../common/include/arch/x86/rte_atomic.h           | 24 ++++++
>   .../common/include/arch/x86/rte_atomic_32.h        | 12 +++
>   .../common/include/arch/x86/rte_atomic_64.h        | 12 +++
>   lib/librte_eal/common/include/generic/rte_atomic.h | 78 ++++++++++++++++++
>   lib/librte_ether/rte_ethdev.c                      | 22 +----
>   lib/librte_ether/rte_ethdev.h                      | 62 ++++++++++++++
>   23 files changed, 302 insertions(+), 677 deletions(-)
>