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Date: Wed, 1 Feb 2023 20:46:52 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Simon Horman <simon.horman@...igine.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Claudiu Manoil <claudiu.manoil@....com>,
Vinicius Costa Gomes <vinicius.gomes@...el.com>,
Kurt Kanzenbach <kurt@...utronix.de>,
Jacob Keller <jacob.e.keller@...el.com>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH v4 net-next 04/15] net: enetc: ensure we always have a
minimum number of TXQs for stack
Hi Simon,
On Wed, Feb 01, 2023 at 02:43:44PM +0100, Simon Horman wrote:
> The nit below notwithstanding,
>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
I appreciate your time to review this patch set.
> > diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
> > index 1fe8dfd6b6d4..e21d096c5a90 100644
> > --- a/drivers/net/ethernet/freescale/enetc/enetc.h
> > +++ b/drivers/net/ethernet/freescale/enetc/enetc.h
> > @@ -369,6 +369,9 @@ struct enetc_ndev_priv {
> >
> > struct psfp_cap psfp_cap;
> >
> > + /* Minimum number of TX queues required by the network stack */
> > + unsigned int min_num_stack_tx_queues;
> > +
>
> It is probably not important.
> But I do notice there are several holes in struct enetc_ndev_priv
> that would fit this field.
This is true. However, this patch was written taking pahole into
consideration, and one new field can only fill a single hole :)
Before:
pahole -C enetc_ndev_priv $KBUILD_OUTPUT/drivers/net/ethernet/freescale/enetc/enetc.o
struct enetc_ndev_priv {
struct net_device * ndev; /* 0 8 */
struct device * dev; /* 8 8 */
struct enetc_si * si; /* 16 8 */
int bdr_int_num; /* 24 4 */
/* XXX 4 bytes hole, try to pack */
struct enetc_int_vector * int_vector[2]; /* 32 16 */
u16 num_rx_rings; /* 48 2 */
u16 num_tx_rings; /* 50 2 */
u16 rx_bd_count; /* 52 2 */
u16 tx_bd_count; /* 54 2 */
u16 msg_enable; /* 56 2 */
/* XXX 2 bytes hole, try to pack */
enum enetc_active_offloads active_offloads; /* 60 4 */
/* --- cacheline 1 boundary (64 bytes) --- */
u32 speed; /* 64 4 */
/* XXX 4 bytes hole, try to pack */
struct enetc_bdr * * xdp_tx_ring; /* 72 8 */
struct enetc_bdr * tx_ring[16]; /* 80 128 */
/* --- cacheline 3 boundary (192 bytes) was 16 bytes ago --- */
struct enetc_bdr * rx_ring[16]; /* 208 128 */
/* --- cacheline 5 boundary (320 bytes) was 16 bytes ago --- */
const struct enetc_bdr_resource * tx_res; /* 336 8 */
const struct enetc_bdr_resource * rx_res; /* 344 8 */
struct enetc_cls_rule * cls_rules; /* 352 8 */
struct psfp_cap psfp_cap; /* 360 20 */
/* XXX 4 bytes hole, try to pack */
/* --- cacheline 6 boundary (384 bytes) --- */
struct phylink * phylink; /* 384 8 */
int ic_mode; /* 392 4 */
u32 tx_ictt; /* 396 4 */
struct bpf_prog * xdp_prog; /* 400 8 */
long unsigned int flags; /* 408 8 */
struct work_struct tx_onestep_tstamp; /* 416 0 */
/* XXX 32 bytes hole, try to pack */
/* --- cacheline 7 boundary (448 bytes) --- */
struct sk_buff_head tx_skbs; /* 448 0 */
/* size: 472, cachelines: 8, members: 26 */
/* sum members: 402, holes: 5, sum holes: 46 */
/* padding: 24 */
/* last cacheline: 24 bytes */
};
After:
struct enetc_ndev_priv {
struct net_device * ndev; /* 0 8 */
struct device * dev; /* 8 8 */
struct enetc_si * si; /* 16 8 */
int bdr_int_num; /* 24 4 */
/* XXX 4 bytes hole, try to pack */
struct enetc_int_vector * int_vector[2]; /* 32 16 */
u16 num_rx_rings; /* 48 2 */
u16 num_tx_rings; /* 50 2 */
u16 rx_bd_count; /* 52 2 */
u16 tx_bd_count; /* 54 2 */
u16 msg_enable; /* 56 2 */
/* XXX 2 bytes hole, try to pack */
enum enetc_active_offloads active_offloads; /* 60 4 */
/* --- cacheline 1 boundary (64 bytes) --- */
u32 speed; /* 64 4 */
/* XXX 4 bytes hole, try to pack */
struct enetc_bdr * * xdp_tx_ring; /* 72 8 */
struct enetc_bdr * tx_ring[16]; /* 80 128 */
/* --- cacheline 3 boundary (192 bytes) was 16 bytes ago --- */
struct enetc_bdr * rx_ring[16]; /* 208 128 */
/* --- cacheline 5 boundary (320 bytes) was 16 bytes ago --- */
const struct enetc_bdr_resource * tx_res; /* 336 8 */
const struct enetc_bdr_resource * rx_res; /* 344 8 */
struct enetc_cls_rule * cls_rules; /* 352 8 */
struct psfp_cap psfp_cap; /* 360 20 */
unsigned int min_num_stack_tx_queues; /* 380 4 */
/* --- cacheline 6 boundary (384 bytes) --- */
struct phylink * phylink; /* 384 8 */
int ic_mode; /* 392 4 */
u32 tx_ictt; /* 396 4 */
struct bpf_prog * xdp_prog; /* 400 8 */
long unsigned int flags; /* 408 8 */
struct work_struct tx_onestep_tstamp; /* 416 0 */
/* XXX 32 bytes hole, try to pack */
/* --- cacheline 7 boundary (448 bytes) --- */
struct sk_buff_head tx_skbs; /* 448 0 */
/* size: 472, cachelines: 8, members: 27 */
/* sum members: 406, holes: 4, sum holes: 42 */
/* padding: 24 */
/* last cacheline: 24 bytes */
};
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