Re: [dpdk-dev] [PATCH v2] net/mlx5: support new representors' naming format

[Dekel Peled <dekelp@mellanox.com>]

Thanks, PSB.

> -----Original Message-----
> From: Shahaf Shuler
> Sent: Thursday, March 7, 2019 10:58 AM
> To: Dekel Peled <dekelp@mellanox.com>; Yongseok Koh
> <yskoh@mellanox.com>
> Cc: dev@dpdk.org; Ori Kam <orika@mellanox.com>; Dekel Peled
> <dekelp@mellanox.com>
> Subject: RE: [dpdk-dev] [PATCH v2] net/mlx5: support new representors'
> naming format
> 
> Sunday, March 3, 2019 9:44 AM, Dekel Peled:
> > Subject: [dpdk-dev] [PATCH v2] net/mlx5: support new representors'
> > naming format
> 
> Representors' -> representor
I'll amend it.

> 
> >
> > Kernel update [1] introduce new format of representors names.
> > This patch implements RFC [2], updating MLX5 PMD to support the new
> > format, while maintaining support of the existing format.
> 
> As a high level comment, I would expect to have some function called
> translate_phys_port_name to translate the netlink/sysfs output to the
> representor number.
> This function should be called from both sysfs and netlink routines.
I'll add it.

> 
> >
> > [1]
> >
> https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit
> >
> hub.com%2Ftorvalds%2Flinux%2Fcommit%2Fc12ecc2&amp;data=02%7C01%
> >
> 7Cshahafs%40mellanox.com%7C98910a4923c64d7af0cc08d69fac0de0%7Ca65
> >
> 2971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C636871958646189312&amp;
> >
> sdata=vMvheEzZJEWRTtSK7z2qjJSxR2o50KnLOGATBAVfueM%3D&amp;reser
> > ved=0
> > [2]
> >
> https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail
> > s.dpdk.org%2Farchives%2Fdev%2F2019-
> >
> March%2F125676.html&amp;data=02%7C01%7Cshahafs%40mellanox.com%7
> >
> C98910a4923c64d7af0cc08d69fac0de0%7Ca652971c7d2e4d9ba6a4d149256f46
> >
> 1b%7C0%7C0%7C636871958646189312&amp;sdata=UWxPP9SXclFAz23dtBHU
> > eIF7v9ZRqbEU4nXUsirDr%2Bg%3D&amp;reserved=0
> >
> > ---
> > v2: Use public link to kernel patch, add link to RFC.
> > ---
> >
> > Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> > ---
> >  drivers/net/mlx5/mlx5_ethdev.c | 14 +++++++++++++-
> >  drivers/net/mlx5/mlx5_nl.c     | 20 +++++++++++++++-----
> >  2 files changed, 28 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_ethdev.c
> > b/drivers/net/mlx5/mlx5_ethdev.c index 795c9c7..664f485 100644
> > --- a/drivers/net/mlx5/mlx5_ethdev.c
> > +++ b/drivers/net/mlx5/mlx5_ethdev.c
> > @@ -1359,7 +1359,8 @@ int mlx5_fw_version_get(struct rte_eth_dev
> *dev,
> > char *fw_ver, size_t fw_size)
> >  	bool port_name_set = false;
> >  	bool port_switch_id_set = false;
> >  	bool device_dir = false;
> > -	char c;
> > +	char c, pf_c1, pf_c2, vf_c1, vf_c2;
> > +	int32_t pf_num;
> >
> >  	if (!if_indextoname(ifindex, ifname)) {
> >  		rte_errno = errno;
> > @@ -1375,9 +1376,20 @@ int mlx5_fw_version_get(struct rte_eth_dev
> > *dev, char *fw_ver, size_t fw_size)
> >
> >  	file = fopen(phys_port_name, "rb");
> >  	if (file != NULL) {
> > +		/* Check for port-name as a number (support kernel ver <
> > 5.0 */
> 
> Logically it should be the other way around.
> First check for new kernel, if not, fall back to older one.
I'll reorder.

> 
> >  		port_name_set =
> >  			fscanf(file, "%d%c", &data.port_name, &c) == 2 &&
> >  			c == '\n';
> > +		if (!port_name_set) {
> > +			/*
> > +			 * Check for port-name as a string of the form pf0vf0
> > +			 * (support kernel ver >= 5.0)
> 
> According to the kernel commit, naming of type p0 or p1 (for the uplink
> vport). Will it work w/ below fscanf?
I don't need this name, only the representors names.
e.g. pf0vf0 will result in name "0". P0 will also result in name "0" but it is not valid.

> 
> > +			 */
> > +			port_name_set = (fscanf(file, "%c%c%d%c%c%d%c",
> > &pf_c1,
> > +						&pf_c2, &pf_num, &vf_c1,
> > &vf_c2,
> > +						&data.port_name, &c) == 7)
> > &&
> > +					c == '\n';
> > +		}
> 
> 
> >  		fclose(file);
> >  	}
> >  	file = fopen(phys_switch_id, "rb");
> > diff --git a/drivers/net/mlx5/mlx5_nl.c b/drivers/net/mlx5/mlx5_nl.c
> > index
> > 0bf6845..cc7b4b8 100644
> > --- a/drivers/net/mlx5/mlx5_nl.c
> > +++ b/drivers/net/mlx5/mlx5_nl.c
> > @@ -849,7 +849,7 @@ struct mlx5_nl_ifindex_data {
> >  	while (off < nh->nlmsg_len) {
> >  		struct rtattr *ra = (void *)((uintptr_t)nh + off);
> >  		void *payload = RTA_DATA(ra);
> > -		char *end;
> > +		char *end, *vf_str;
> >  		unsigned int i;
> >
> >  		if (ra->rta_len > nh->nlmsg_len - off) @@ -861,10 +861,20
> @@ struct
> > mlx5_nl_ifindex_data {
> >  		case IFLA_PHYS_PORT_NAME:
> >  			errno = 0;
> >  			info.port_name = strtol(payload, &end, 0);
> 
> Again, the logic should be first try the new naming and fallback to old ones.
I'll reorder.

> 
> > -			if (errno ||
> > -			    (size_t)(end - (char *)payload) != strlen(payload))
> > -				goto error;
> > -			port_name_set = true;
> > +			if (errno || ((size_t)(end - (char *)payload) !=
> > +				      strlen(payload))) {
> > +				vf_str = strstr(payload, "vf");
> > +				if (vf_str) {
> > +					errno = 0;
> > +					info.port_name = strtol(vf_str + 2,
> > +								&end, 0);
> 
> Again, true also in case port name is p0?
See comment above.

> 
> > +					port_name_set = true;
> > +				}
> > +				if (errno)
> > +					goto error;
> > +			} else {
> > +				port_name_set = true;
> > +			}
> >  			break;
> >  		case IFLA_PHYS_SWITCH_ID:
> >  			info.switch_id = 0;
> > --
> > 1.8.3.1