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SubjectRe: [Intel-wired-lan] [PATCH V2 net] ice: Re-organizes reqstd/avail {R, T}XQ check/code for efficiency+readability
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Dear Salil,


Thank you very much for your patch.

In the git commit message summary, could you please use imperative mood [1]?

> Re-organize reqstd/avail {R, T}XQ check/code for efficiency+readability

It’s a bit long though. Maybe:

> Avoid unnecessary assignment with user specified {R,T}XQs

Am 14.04.21 um 00:44 schrieb Salil Mehta:
> If user has explicitly requested the number of {R,T}XQs, then it is
> unnecessary to get the count of already available {R,T}XQs from the
> PF avail_{r,t}xqs bitmap. This value will get overridden by user specified
> value in any case.
>
> This patch does minor re-organization of the code for improving the flow
> and readabiltiy. This scope of improvement was found during the review of

readabil*it*y

> the ICE driver code.
>
> FYI, I could not test this change due to unavailability of the hardware.
> It would be helpful if somebody can test this patch and provide Tested-by
> Tag. Many thanks!

This should go outside the commit message (below the --- for example).

> Fixes: 87324e747fde ("ice: Implement ethtool ops for channels")

Did you check the behavior before is actually a bug? Or is it just for
the detection heuristic for commits to be applied to the stable series?

> Cc: intel-wired-lan@lists.osuosl.org
> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> --
> Change V1->V2
> (*) Fixed the comments from Anthony Nguyen(Intel)
> Link: https://lkml.org/lkml/2021/4/12/1997
> ---
> drivers/net/ethernet/intel/ice/ice_lib.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
> index d13c7fc8fb0a..d77133d6baa7 100644
> --- a/drivers/net/ethernet/intel/ice/ice_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
> @@ -161,12 +161,13 @@ static void ice_vsi_set_num_qs(struct ice_vsi *vsi, u16 vf_id)
>
> switch (vsi->type) {
> case ICE_VSI_PF:
> - vsi->alloc_txq = min3(pf->num_lan_msix,
> - ice_get_avail_txq_count(pf),
> - (u16)num_online_cpus());
> if (vsi->req_txq) {
> vsi->alloc_txq = vsi->req_txq;
> vsi->num_txq = vsi->req_txq;
> + } else {
> + vsi->alloc_txq = min3(pf->num_lan_msix,
> + ice_get_avail_txq_count(pf),
> + (u16)num_online_cpus());
> }

I am curious, did you check the compiler actually creates different
code, or did it notice the inefficiency by itself and optimized it already?

>
> pf->num_lan_tx = vsi->alloc_txq;
> @@ -175,12 +176,13 @@ static void ice_vsi_set_num_qs(struct ice_vsi *vsi, u16 vf_id)
> if (!test_bit(ICE_FLAG_RSS_ENA, pf->flags)) {
> vsi->alloc_rxq = 1;
> } else {
> - vsi->alloc_rxq = min3(pf->num_lan_msix,
> - ice_get_avail_rxq_count(pf),
> - (u16)num_online_cpus());
> if (vsi->req_rxq) {
> vsi->alloc_rxq = vsi->req_rxq;
> vsi->num_rxq = vsi->req_rxq;
> + } else {
> + vsi->alloc_rxq = min3(pf->num_lan_msix,
> + ice_get_avail_rxq_count(pf),
> + (u16)num_online_cpus());
> }
> }
>


Kind regards,

Paul

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