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Message-ID: <aSRXEb/X7MAJAeFm@chelsio.com>
Date: Mon, 24 Nov 2025 18:31:05 +0530
From: Potnuri Bharat Teja <bharat@...lsio.com>
To: Alan Maguire <alan.maguire@...cle.com>
Cc: "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>,
"davem@...emloft.net" <davem@...emloft.net>,
"edumazet@...gle.com" <edumazet@...gle.com>,
"kuba@...nel.org" <kuba@...nel.org>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"kees@...nel.org" <kees@...nel.org>,
"gustavoars@...nel.org" <gustavoars@...nel.org>,
"hariprasad@...lsio.com" <hariprasad@...lsio.com>,
Jeff Hwang <jhwang@...lsio.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH net] cxgb4: Rename sched_class to avoid type clash
On Friday, November 11/21/25, 2025 at 23:42:31 +0530, Alan Maguire wrote:
> drivers/net/ethernet/chelsio/cxgb4/sched.h declares a sched_class
> struct which has a type name clash with struct sched_class
> in kernel/sched/sched.h (a type used in a field in task_struct).
>
> When cxgb4 is a builtin we end up with both sched_class types,
> and as a result of this we wind up with DWARF (and derived from
> that BTF) with a duplicate incorrect task_struct representation.
> When cxgb4 is built-in this type clash can cause kernel builds to
> fail as resolve_btfids will fail when confused which task_struct
> to use. See [1] for more details.
>
> As such, renaming sched_class to ch_sched_class (in line with
> other structs like ch_sched_flowc) makes sense.
>
> [1] https://lore.kernel.org/bpf/2412725b-916c-47bd-91c3-c2d57e3e6c7b@acm.org/
>
> Fixes: b72a32dacdfa ("cxgb4: add support for tx traffic scheduling classes")
> Reported-by: Bart Van Assche <bvanassche@....org>
> Reviewed-by: Bart Van Assche <bvanassche@....org>
> Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
Thanks.
Acked-by: Potnuri Bharat Teja <bharat@...lsio.com>
> ---
> .../net/ethernet/chelsio/cxgb4/cxgb4_main.c | 2 +-
> .../chelsio/cxgb4/cxgb4_tc_matchall.c | 4 +-
> .../ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c | 2 +-
> drivers/net/ethernet/chelsio/cxgb4/sched.c | 44 +++++++++----------
> drivers/net/ethernet/chelsio/cxgb4/sched.h | 12 ++---
> 5 files changed, 32 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> index 392723ef14e5..ac0c7fe5743b 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> @@ -3485,7 +3485,7 @@ static int cxgb_set_tx_maxrate(struct net_device *dev, int index, u32 rate)
> struct adapter *adap = pi->adapter;
> struct ch_sched_queue qe = { 0 };
> struct ch_sched_params p = { 0 };
> - struct sched_class *e;
> + struct ch_sched_class *e;
> u32 req_rate;
> int err = 0;
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c
> index 1672d3afe5be..f8dcf0b4abcd 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_matchall.c
> @@ -56,7 +56,7 @@ static int cxgb4_matchall_egress_validate(struct net_device *dev,
> struct port_info *pi = netdev2pinfo(dev);
> struct flow_action_entry *entry;
> struct ch_sched_queue qe;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> u64 max_link_rate;
> u32 i, speed;
> int ret;
> @@ -180,7 +180,7 @@ static int cxgb4_matchall_alloc_tc(struct net_device *dev,
> struct port_info *pi = netdev2pinfo(dev);
> struct adapter *adap = netdev2adap(dev);
> struct flow_action_entry *entry;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> int ret;
> u32 i;
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
> index 338b04f339b3..a2dcd2e24263 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
> @@ -330,7 +330,7 @@ static int cxgb4_mqprio_alloc_tc(struct net_device *dev,
> struct cxgb4_tc_port_mqprio *tc_port_mqprio;
> struct port_info *pi = netdev2pinfo(dev);
> struct adapter *adap = netdev2adap(dev);
> - struct sched_class *e;
> + struct ch_sched_class *e;
> int ret;
> u8 i;
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.c b/drivers/net/ethernet/chelsio/cxgb4/sched.c
> index a1b14468d1ff..38a30aeee122 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/sched.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/sched.c
> @@ -44,7 +44,7 @@ static int t4_sched_class_fw_cmd(struct port_info *pi,
> {
> struct adapter *adap = pi->adapter;
> struct sched_table *s = pi->sched_tbl;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> int err = 0;
>
> e = &s->tab[p->u.params.class];
> @@ -122,7 +122,7 @@ static void *t4_sched_entry_lookup(struct port_info *pi,
> const u32 val)
> {
> struct sched_table *s = pi->sched_tbl;
> - struct sched_class *e, *end;
> + struct ch_sched_class *e, *end;
> void *found = NULL;
>
> /* Look for an entry with matching @val */
> @@ -166,8 +166,8 @@ static void *t4_sched_entry_lookup(struct port_info *pi,
> return found;
> }
>
> -struct sched_class *cxgb4_sched_queue_lookup(struct net_device *dev,
> - struct ch_sched_queue *p)
> +struct ch_sched_class *cxgb4_sched_queue_lookup(struct net_device *dev,
> + struct ch_sched_queue *p)
> {
> struct port_info *pi = netdev2pinfo(dev);
> struct sched_queue_entry *qe = NULL;
> @@ -187,7 +187,7 @@ static int t4_sched_queue_unbind(struct port_info *pi, struct ch_sched_queue *p)
> struct sched_queue_entry *qe = NULL;
> struct adapter *adap = pi->adapter;
> struct sge_eth_txq *txq;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> int err = 0;
>
> if (p->queue < 0 || p->queue >= pi->nqsets)
> @@ -218,7 +218,7 @@ static int t4_sched_queue_bind(struct port_info *pi, struct ch_sched_queue *p)
> struct sched_queue_entry *qe = NULL;
> struct adapter *adap = pi->adapter;
> struct sge_eth_txq *txq;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> unsigned int qid;
> int err = 0;
>
> @@ -260,7 +260,7 @@ static int t4_sched_flowc_unbind(struct port_info *pi, struct ch_sched_flowc *p)
> {
> struct sched_flowc_entry *fe = NULL;
> struct adapter *adap = pi->adapter;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> int err = 0;
>
> if (p->tid < 0 || p->tid >= adap->tids.neotids)
> @@ -288,7 +288,7 @@ static int t4_sched_flowc_bind(struct port_info *pi, struct ch_sched_flowc *p)
> struct sched_table *s = pi->sched_tbl;
> struct sched_flowc_entry *fe = NULL;
> struct adapter *adap = pi->adapter;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> int err = 0;
>
> if (p->tid < 0 || p->tid >= adap->tids.neotids)
> @@ -322,7 +322,7 @@ static int t4_sched_flowc_bind(struct port_info *pi, struct ch_sched_flowc *p)
> }
>
> static void t4_sched_class_unbind_all(struct port_info *pi,
> - struct sched_class *e,
> + struct ch_sched_class *e,
> enum sched_bind_type type)
> {
> if (!e)
> @@ -476,12 +476,12 @@ int cxgb4_sched_class_unbind(struct net_device *dev, void *arg,
> }
>
> /* If @p is NULL, fetch any available unused class */
> -static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
> - const struct ch_sched_params *p)
> +static struct ch_sched_class *t4_sched_class_lookup(struct port_info *pi,
> + const struct ch_sched_params *p)
> {
> struct sched_table *s = pi->sched_tbl;
> - struct sched_class *found = NULL;
> - struct sched_class *e, *end;
> + struct ch_sched_class *found = NULL;
> + struct ch_sched_class *e, *end;
>
> if (!p) {
> /* Get any available unused class */
> @@ -522,10 +522,10 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
> return found;
> }
>
> -static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
> - struct ch_sched_params *p)
> +static struct ch_sched_class *t4_sched_class_alloc(struct port_info *pi,
> + struct ch_sched_params *p)
> {
> - struct sched_class *e = NULL;
> + struct ch_sched_class *e = NULL;
> u8 class_id;
> int err;
>
> @@ -579,8 +579,8 @@ static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
> * scheduling class with matching @p is found, then the matching class is
> * returned.
> */
> -struct sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
> - struct ch_sched_params *p)
> +struct ch_sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
> + struct ch_sched_params *p)
> {
> struct port_info *pi = netdev2pinfo(dev);
> u8 class_id;
> @@ -607,7 +607,7 @@ void cxgb4_sched_class_free(struct net_device *dev, u8 classid)
> struct port_info *pi = netdev2pinfo(dev);
> struct sched_table *s = pi->sched_tbl;
> struct ch_sched_params p;
> - struct sched_class *e;
> + struct ch_sched_class *e;
> u32 speed;
> int ret;
>
> @@ -640,7 +640,7 @@ void cxgb4_sched_class_free(struct net_device *dev, u8 classid)
> }
> }
>
> -static void t4_sched_class_free(struct net_device *dev, struct sched_class *e)
> +static void t4_sched_class_free(struct net_device *dev, struct ch_sched_class *e)
> {
> struct port_info *pi = netdev2pinfo(dev);
>
> @@ -660,7 +660,7 @@ struct sched_table *t4_init_sched(unsigned int sched_size)
> s->sched_size = sched_size;
>
> for (i = 0; i < s->sched_size; i++) {
> - memset(&s->tab[i], 0, sizeof(struct sched_class));
> + memset(&s->tab[i], 0, sizeof(struct ch_sched_class));
> s->tab[i].idx = i;
> s->tab[i].state = SCHED_STATE_UNUSED;
> INIT_LIST_HEAD(&s->tab[i].entry_list);
> @@ -682,7 +682,7 @@ void t4_cleanup_sched(struct adapter *adap)
> continue;
>
> for (i = 0; i < s->sched_size; i++) {
> - struct sched_class *e;
> + struct ch_sched_class *e;
>
> e = &s->tab[i];
> if (e->state == SCHED_STATE_ACTIVE)
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.h b/drivers/net/ethernet/chelsio/cxgb4/sched.h
> index 6b3c778815f0..4d3b5a757536 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/sched.h
> +++ b/drivers/net/ethernet/chelsio/cxgb4/sched.h
> @@ -71,7 +71,7 @@ struct sched_flowc_entry {
> struct ch_sched_flowc param;
> };
>
> -struct sched_class {
> +struct ch_sched_class {
> u8 state;
> u8 idx;
> struct ch_sched_params info;
> @@ -82,7 +82,7 @@ struct sched_class {
>
> struct sched_table { /* per port scheduling table */
> u8 sched_size;
> - struct sched_class tab[] __counted_by(sched_size);
> + struct ch_sched_class tab[] __counted_by(sched_size);
> };
>
> static inline bool can_sched(struct net_device *dev)
> @@ -103,15 +103,15 @@ static inline bool valid_class_id(struct net_device *dev, u8 class_id)
> return true;
> }
>
> -struct sched_class *cxgb4_sched_queue_lookup(struct net_device *dev,
> - struct ch_sched_queue *p);
> +struct ch_sched_class *cxgb4_sched_queue_lookup(struct net_device *dev,
> + struct ch_sched_queue *p);
> int cxgb4_sched_class_bind(struct net_device *dev, void *arg,
> enum sched_bind_type type);
> int cxgb4_sched_class_unbind(struct net_device *dev, void *arg,
> enum sched_bind_type type);
>
> -struct sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
> - struct ch_sched_params *p);
> +struct ch_sched_class *cxgb4_sched_class_alloc(struct net_device *dev,
> + struct ch_sched_params *p);
> void cxgb4_sched_class_free(struct net_device *dev, u8 classid);
>
> struct sched_table *t4_init_sched(unsigned int size);
> --
> 2.39.3
>
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