Message ID | 20210917144043.566049-2-idosch@idosch.org (mailing list archive) |
---|---|
State | Changes Requested, archived |
Delegated to: | Michal Kubecek |
Headers | show |
Series | ethtool: Small EEPROM changes | expand |
Context | Check | Description |
---|---|---|
netdev/tree_selection | success | Not a local patch |
On Fri, Sep 17, 2021 at 05:40:37PM +0300, Ido Schimmel wrote: > From: Ido Schimmel <idosch@nvidia.com> > > In CMIS, unlike SFF-8636, there is no presence indication for the CLEI > code (Common Language Equipment Identification) field. The field is > always present, but might not be supported. In which case, "a value of > all ASCII 20h (spaces) shall be entered". > > Therefore, remove the erroneous check which seems to be influenced from > SFF-8636 and only print the string if it is supported and has a non-zero > length. > > Signed-off-by: Ido Schimmel <idosch@nvidia.com> > --- > cmis.c | 8 +++++--- > cmis.h | 3 +-- > 2 files changed, 6 insertions(+), 5 deletions(-) > > diff --git a/cmis.c b/cmis.c > index 1a91e798e4b8..2a48c1a1d56a 100644 > --- a/cmis.c > +++ b/cmis.c > @@ -307,6 +307,8 @@ static void cmis_show_link_len(const __u8 *id) > */ > static void cmis_show_vendor_info(const __u8 *id) > { > + const char *clei = (const char *)(id + CMIS_CLEI_START_OFFSET); > + > sff_show_ascii(id, CMIS_VENDOR_NAME_START_OFFSET, > CMIS_VENDOR_NAME_END_OFFSET, "Vendor name"); > cmis_show_oui(id); > @@ -319,9 +321,9 @@ static void cmis_show_vendor_info(const __u8 *id) > sff_show_ascii(id, CMIS_DATE_YEAR_OFFSET, > CMIS_DATE_VENDOR_LOT_OFFSET + 1, "Date code"); > > - if (id[CMIS_CLEI_PRESENT_BYTE] & CMIS_CLEI_PRESENT_MASK) > - sff_show_ascii(id, CMIS_CLEI_START_OFFSET, > - CMIS_CLEI_END_OFFSET, "CLEI code"); > + if (strlen(clei) && strcmp(clei, CMIS_CLEI_BLANK)) > + sff_show_ascii(id, CMIS_CLEI_START_OFFSET, CMIS_CLEI_END_OFFSET, > + "CLEI code"); > } > > void qsfp_dd_show_all(const __u8 *id) Is it safe to assume that the string will be always null terminated? Looking at the code below, CMIS_CLEI_BLANK consists of 10 spaces which would fill the whole block at offsets 0xBE through 0xC7 with spaces and offset 0xC8 is used as CMIS_PWR_CLASS_OFFSET. Also, sff_show_ascii() doesn't seem to expect a null terminated string, rather a space padded one. Michal > diff --git a/cmis.h b/cmis.h > index 78ee1495bc33..d365252baa48 100644 > --- a/cmis.h > +++ b/cmis.h > @@ -34,10 +34,9 @@ > #define CMIS_DATE_VENDOR_LOT_OFFSET 0xBC > > /* CLEI Code (Page 0) */ > -#define CMIS_CLEI_PRESENT_BYTE 0x02 > -#define CMIS_CLEI_PRESENT_MASK 0x20 > #define CMIS_CLEI_START_OFFSET 0xBE > #define CMIS_CLEI_END_OFFSET 0xC7 > +#define CMIS_CLEI_BLANK " " > > /* Cable assembly length */ > #define CMIS_CBL_ASM_LEN_OFFSET 0xCA > -- > 2.31.1 >
On Thu, Sep 30, 2021 at 10:21:33PM +0200, Michal Kubecek wrote: > On Fri, Sep 17, 2021 at 05:40:37PM +0300, Ido Schimmel wrote: > > From: Ido Schimmel <idosch@nvidia.com> > > > > In CMIS, unlike SFF-8636, there is no presence indication for the CLEI > > code (Common Language Equipment Identification) field. The field is > > always present, but might not be supported. In which case, "a value of > > all ASCII 20h (spaces) shall be entered". > > > > Therefore, remove the erroneous check which seems to be influenced from > > SFF-8636 and only print the string if it is supported and has a non-zero > > length. > > > > Signed-off-by: Ido Schimmel <idosch@nvidia.com> > > --- > > cmis.c | 8 +++++--- > > cmis.h | 3 +-- > > 2 files changed, 6 insertions(+), 5 deletions(-) > > > > diff --git a/cmis.c b/cmis.c > > index 1a91e798e4b8..2a48c1a1d56a 100644 > > --- a/cmis.c > > +++ b/cmis.c > > @@ -307,6 +307,8 @@ static void cmis_show_link_len(const __u8 *id) > > */ > > static void cmis_show_vendor_info(const __u8 *id) > > { > > + const char *clei = (const char *)(id + CMIS_CLEI_START_OFFSET); > > + > > sff_show_ascii(id, CMIS_VENDOR_NAME_START_OFFSET, > > CMIS_VENDOR_NAME_END_OFFSET, "Vendor name"); > > cmis_show_oui(id); > > @@ -319,9 +321,9 @@ static void cmis_show_vendor_info(const __u8 *id) > > sff_show_ascii(id, CMIS_DATE_YEAR_OFFSET, > > CMIS_DATE_VENDOR_LOT_OFFSET + 1, "Date code"); > > > > - if (id[CMIS_CLEI_PRESENT_BYTE] & CMIS_CLEI_PRESENT_MASK) > > - sff_show_ascii(id, CMIS_CLEI_START_OFFSET, > > - CMIS_CLEI_END_OFFSET, "CLEI code"); > > + if (strlen(clei) && strcmp(clei, CMIS_CLEI_BLANK)) > > + sff_show_ascii(id, CMIS_CLEI_START_OFFSET, CMIS_CLEI_END_OFFSET, > > + "CLEI code"); > > } > > > > void qsfp_dd_show_all(const __u8 *id) > > Is it safe to assume that the string will be always null terminated? No. You want to see strnlen() and strncmp() instead? > Looking at the code below, CMIS_CLEI_BLANK consists of 10 spaces which > would fill the whole block at offsets 0xBE through 0xC7 with spaces and > offset 0xC8 is used as CMIS_PWR_CLASS_OFFSET. Also, sff_show_ascii() > doesn't seem to expect a null terminated string, rather a space padded > one. > > Michal > > > > diff --git a/cmis.h b/cmis.h > > index 78ee1495bc33..d365252baa48 100644 > > --- a/cmis.h > > +++ b/cmis.h > > @@ -34,10 +34,9 @@ > > #define CMIS_DATE_VENDOR_LOT_OFFSET 0xBC > > > > /* CLEI Code (Page 0) */ > > -#define CMIS_CLEI_PRESENT_BYTE 0x02 > > -#define CMIS_CLEI_PRESENT_MASK 0x20 > > #define CMIS_CLEI_START_OFFSET 0xBE > > #define CMIS_CLEI_END_OFFSET 0xC7 > > +#define CMIS_CLEI_BLANK " " > > > > /* Cable assembly length */ > > #define CMIS_CBL_ASM_LEN_OFFSET 0xCA > > -- > > 2.31.1 > >
On Thu, Sep 30, 2021 at 11:41:02PM +0300, Ido Schimmel wrote: > On Thu, Sep 30, 2021 at 10:21:33PM +0200, Michal Kubecek wrote: > > On Fri, Sep 17, 2021 at 05:40:37PM +0300, Ido Schimmel wrote: > > > From: Ido Schimmel <idosch@nvidia.com> > > > > > > In CMIS, unlike SFF-8636, there is no presence indication for the CLEI > > > code (Common Language Equipment Identification) field. The field is > > > always present, but might not be supported. In which case, "a value of > > > all ASCII 20h (spaces) shall be entered". > > > > > > Therefore, remove the erroneous check which seems to be influenced from > > > SFF-8636 and only print the string if it is supported and has a non-zero > > > length. > > > > > > Signed-off-by: Ido Schimmel <idosch@nvidia.com> > > > --- > > > cmis.c | 8 +++++--- > > > cmis.h | 3 +-- > > > 2 files changed, 6 insertions(+), 5 deletions(-) > > > > > > diff --git a/cmis.c b/cmis.c > > > index 1a91e798e4b8..2a48c1a1d56a 100644 > > > --- a/cmis.c > > > +++ b/cmis.c > > > @@ -307,6 +307,8 @@ static void cmis_show_link_len(const __u8 *id) > > > */ > > > static void cmis_show_vendor_info(const __u8 *id) > > > { > > > + const char *clei = (const char *)(id + CMIS_CLEI_START_OFFSET); > > > + > > > sff_show_ascii(id, CMIS_VENDOR_NAME_START_OFFSET, > > > CMIS_VENDOR_NAME_END_OFFSET, "Vendor name"); > > > cmis_show_oui(id); > > > @@ -319,9 +321,9 @@ static void cmis_show_vendor_info(const __u8 *id) > > > sff_show_ascii(id, CMIS_DATE_YEAR_OFFSET, > > > CMIS_DATE_VENDOR_LOT_OFFSET + 1, "Date code"); > > > > > > - if (id[CMIS_CLEI_PRESENT_BYTE] & CMIS_CLEI_PRESENT_MASK) > > > - sff_show_ascii(id, CMIS_CLEI_START_OFFSET, > > > - CMIS_CLEI_END_OFFSET, "CLEI code"); > > > + if (strlen(clei) && strcmp(clei, CMIS_CLEI_BLANK)) > > > + sff_show_ascii(id, CMIS_CLEI_START_OFFSET, CMIS_CLEI_END_OFFSET, > > > + "CLEI code"); > > > } > > > > > > void qsfp_dd_show_all(const __u8 *id) > > > > Is it safe to assume that the string will be always null terminated? > > No. You want to see strnlen() and strncmp() instead? Yes, that would solve the problem. Actually, "strlen(clei)" could be also replaced with "*clei" or "clei[0]" as a string is empty if and only if its first byte is null. Michal > > Looking at the code below, CMIS_CLEI_BLANK consists of 10 spaces which > > would fill the whole block at offsets 0xBE through 0xC7 with spaces and > > offset 0xC8 is used as CMIS_PWR_CLASS_OFFSET. Also, sff_show_ascii() > > doesn't seem to expect a null terminated string, rather a space padded > > one.
diff --git a/cmis.c b/cmis.c index 1a91e798e4b8..2a48c1a1d56a 100644 --- a/cmis.c +++ b/cmis.c @@ -307,6 +307,8 @@ static void cmis_show_link_len(const __u8 *id) */ static void cmis_show_vendor_info(const __u8 *id) { + const char *clei = (const char *)(id + CMIS_CLEI_START_OFFSET); + sff_show_ascii(id, CMIS_VENDOR_NAME_START_OFFSET, CMIS_VENDOR_NAME_END_OFFSET, "Vendor name"); cmis_show_oui(id); @@ -319,9 +321,9 @@ static void cmis_show_vendor_info(const __u8 *id) sff_show_ascii(id, CMIS_DATE_YEAR_OFFSET, CMIS_DATE_VENDOR_LOT_OFFSET + 1, "Date code"); - if (id[CMIS_CLEI_PRESENT_BYTE] & CMIS_CLEI_PRESENT_MASK) - sff_show_ascii(id, CMIS_CLEI_START_OFFSET, - CMIS_CLEI_END_OFFSET, "CLEI code"); + if (strlen(clei) && strcmp(clei, CMIS_CLEI_BLANK)) + sff_show_ascii(id, CMIS_CLEI_START_OFFSET, CMIS_CLEI_END_OFFSET, + "CLEI code"); } void qsfp_dd_show_all(const __u8 *id) diff --git a/cmis.h b/cmis.h index 78ee1495bc33..d365252baa48 100644 --- a/cmis.h +++ b/cmis.h @@ -34,10 +34,9 @@ #define CMIS_DATE_VENDOR_LOT_OFFSET 0xBC /* CLEI Code (Page 0) */ -#define CMIS_CLEI_PRESENT_BYTE 0x02 -#define CMIS_CLEI_PRESENT_MASK 0x20 #define CMIS_CLEI_START_OFFSET 0xBE #define CMIS_CLEI_END_OFFSET 0xC7 +#define CMIS_CLEI_BLANK " " /* Cable assembly length */ #define CMIS_CBL_ASM_LEN_OFFSET 0xCA