netdev - Re: [PATCH net v8 3/4] octeon_ep_vf: remove firmware stats fetch in ndo_get

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Message-ID: <Z4ko7cYyMbMzGkAC@lzaremba-mobl.ger.corp.intel.com>
Date: Thu, 16 Jan 2025 16:42:37 +0100
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: Shinas Rasheed <srasheed@...vell.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<hgani@...vell.com>, <sedara@...vell.com>, <vimleshk@...vell.com>,
	<thaller@...hat.com>, <wizhao@...hat.com>, <kheib@...hat.com>,
	<konguyen@...hat.com>, <horms@...nel.org>, <einstein.xue@...axg.com>,
	Veerasenareddy Burru <vburru@...vell.com>, Satananda Burla
	<sburla@...vell.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net v8 3/4] octeon_ep_vf: remove firmware stats fetch in
 ndo_get_stats64

On Thu, Jan 16, 2025 at 12:38:24AM -0800, Shinas Rasheed wrote:
> The per queue stats are available already and are retrieved
> from register reads during ndo_get_stats64.

Please update this after changing the patch order.

> The firmware stats
> fetch call that happens in ndo_get_stats64() is currently not
> required
> 
> The warn log is given below:
> 

This is not a call trace for VF functions, you should probably mention that in 
the commit message.

Other than that, I think the series is on the right track, though patches 2/4 
and 4/4 may need more attention.

Reviewed-by: Larysa Zaremba <larysa.zaremba@...el.com>

> [  123.316837] ------------[ cut here ]------------
> [  123.316840] Voluntary context switch within RCU read-side critical section!
> [  123.316917] pc : rcu_note_context_switch+0x2e4/0x300
> [  123.316919] lr : rcu_note_context_switch+0x2e4/0x300
> [  123.316947] Call trace:
> [  123.316949]  rcu_note_context_switch+0x2e4/0x300
> [  123.316952]  __schedule+0x84/0x584
> [  123.316955]  schedule+0x38/0x90
> [  123.316956]  schedule_timeout+0xa0/0x1d4
> [  123.316959]  octep_send_mbox_req+0x190/0x230 [octeon_ep]
> [  123.316966]  octep_ctrl_net_get_if_stats+0x78/0x100 [octeon_ep]
> [  123.316970]  octep_get_stats64+0xd4/0xf0 [octeon_ep]
> [  123.316975]  dev_get_stats+0x4c/0x114
> [  123.316977]  dev_seq_printf_stats+0x3c/0x11c
> [  123.316980]  dev_seq_show+0x1c/0x40
> [  123.316982]  seq_read_iter+0x3cc/0x4e0
> [  123.316985]  seq_read+0xc8/0x110
> [  123.316987]  proc_reg_read+0x9c/0xec
> [  123.316990]  vfs_read+0xc8/0x2ec
> [  123.316993]  ksys_read+0x70/0x100
> [  123.316995]  __arm64_sys_read+0x20/0x30
> [  123.316997]  invoke_syscall.constprop.0+0x7c/0xd0
> [  123.317000]  do_el0_svc+0xb4/0xd0
> [  123.317002]  el0_svc+0xe8/0x1f4
> [  123.317005]  el0t_64_sync_handler+0x134/0x150
> [  123.317006]  el0t_64_sync+0x17c/0x180
> [  123.317008] ---[ end trace 63399811432ab69b ]---
> 
> Fixes: c3fad23cdc06 ("octeon_ep_vf: add support for ndo ops")
> Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
> ---
> V8:
>   - Reordered patch
> 
> V7: https://lore.kernel.org/all/20250114125124.2570660-5-srasheed@marvell.com/
>   - No changes
> 
> V6: https://lore.kernel.org/all/20250110122730.2551863-5-srasheed@marvell.com/
>   - No changes
> 
> V5: https://lore.kernel.org/all/20250109103221.2544467-5-srasheed@marvell.com/
>   - No changes
> 
> V4: https://lore.kernel.org/all/20250102112246.2494230-5-srasheed@marvell.com/
>   - No changes
> 
> V3: https://lore.kernel.org/all/20241218115111.2407958-5-srasheed@marvell.com/
>   - Added warn log that happened due to rcu_read_lock in commit message
> 
> V2: https://lore.kernel.org/all/20241216075842.2394606-5-srasheed@marvell.com/
>   - No changes
> 
> V1: https://lore.kernel.org/all/20241203072130.2316913-5-srasheed@marvell.com/
> 
>  drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c
> index 7e6771c9cdbb..4c699514fd57 100644
> --- a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c
> +++ b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c
> @@ -799,14 +799,6 @@ static void octep_vf_get_stats64(struct net_device *netdev,
>  	stats->tx_bytes = tx_bytes;
>  	stats->rx_packets = rx_packets;
>  	stats->rx_bytes = rx_bytes;
> -	if (!octep_vf_get_if_stats(oct)) {
> -		stats->multicast = oct->iface_rx_stats.mcast_pkts;
> -		stats->rx_errors = oct->iface_rx_stats.err_pkts;
> -		stats->rx_dropped = oct->iface_rx_stats.dropped_pkts_fifo_full +
> -				    oct->iface_rx_stats.err_pkts;
> -		stats->rx_missed_errors = oct->iface_rx_stats.dropped_pkts_fifo_full;
> -		stats->tx_dropped = oct->iface_tx_stats.dropped;
> -	}
>  }
>  
>  /**
> -- 
> 2.25.1
> 
>