On Thu, Aug 03, 2023 at 09:24:20PM +0800, Guangguan Wang wrote:
> Support max connections per lgr negotiation for SMCR v2.1,
> which is one of smc v2.1 features.
>
> Signed-off-by: Guangguan Wang <guangguan.wang@xxxxxxxxxxxxxxxxx>
> Reviewed-by: Tony Lu <tonylu@xxxxxxxxxxxxxxxxx>
...
Hi Guangguan Wang,
> int smc_clc_cli_v2x_features_validate(struct smc_clc_first_contact_ext *fce,
> struct smc_init_info *ini)
> {
> + struct smc_clc_first_contact_ext_v2x *fce_v2x =
> + (struct smc_clc_first_contact_ext_v2x *)fce;
> +
> if (ini->release_ver < SMC_RELEASE_1)
> return 0;
>
> + if (!ini->is_smcd) {
> + if (fce_v2x->max_conns > SMC_CONN_PER_LGR_MAX)
The type of the max_cons field is u8.
The value of SMC_CONN_PER_LGR_MAX is 255 (in another patch of this series),
the maximum value that the max_cons field can be assigned.
So it seems that this condition cannot ever be true.
As flagged by Smatch.
> + return SMC_CLC_DECL_MAXCONNERR;
> + ini->max_conns = fce_v2x->max_conns;
> + }
> +
> return 0;
> }
...
> diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h
...
> @@ -236,7 +238,8 @@ struct smc_clc_first_contact_ext {
>
> struct smc_clc_first_contact_ext_v2x {
> struct smc_clc_first_contact_ext fce_v20;
> - u8 reserved3[4];
> + u8 max_conns; /* for SMC-R only */
> + u8 reserved3[3];
> __be32 vendor_exp_options;
> u8 reserved4[8];
> } __packed; /* format defined in
...
> diff --git a/net/smc/smc_core.h b/net/smc/smc_core.h
> index 1a97fef39127..065369dc6584 100644
> --- a/net/smc/smc_core.h
> +++ b/net/smc/smc_core.h
> @@ -22,6 +22,7 @@
> #include "smc_ib.h"
>
> #define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */
> +#define SMC_CONN_PER_LGR_MAX 255 /* max. # of connections per link group */
>
> struct smc_lgr_list { /* list of link group definition */
> struct list_head list;
