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| author |   James Smart <jsmart2021@gmail.com> | 2017-07-17 13:59:39 -0700 |
|---|---|---|
| committer |   Christoph Hellwig <hch@lst.de> | 2017-07-25 18:05:25 +0200 |
| commit | 9c5358e15ca12ed3dc3b1e51671dee5d155de8e0 (patch) | |
| tree | 53ce8b540ad8f55686ef56a42dcc309b14e513d3 /include | |
| parent | nvme-fc: address target disconnect race conditions in fcp io submit (diff) | |
| download | linux-dev-9c5358e15ca12ed3dc3b1e51671dee5d155de8e0.tar.xz linux-dev-9c5358e15ca12ed3dc3b1e51671dee5d155de8e0.zip | |
nvme-fc: revise TRADDR parsing
The FC-NVME spec hasn't locked down on the format string for TRADDR.
Currently the spec is lobbying for "nn-<16hexdigits>:pn-<16hexdigits>"
where the wwn's are hex values but not prefixed by 0x.
Most implementations so far expect a string format of
"nn-0x<16hexdigits>:pn-0x<16hexdigits>" to be used. The transport
uses the match_u64 parser which requires a leading 0x prefix to set
the base properly. If it's not there, a match will either fail or return
a base 10 value.
The resolution in T11 is pushing out. Therefore, to fix things now and
to cover any eventuality and any implementations already in the field,
this patch adds support for both formats.
The change consists of replacing the token matching routine with a
routine that validates the fixed string format, and then builds
a local copy of the hex name with a 0x prefix before calling
the system parser.
Note: the same parser routine exists in both the initiator and target
transports. Given this is about the only "shared" item, we chose to
replicate rather than create an interdendency on some shared code.
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/nvme-fc.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/nvme-fc.h b/include/linux/nvme-fc.h index 21c37e39e41a..36cca93a5ff2 100644 --- a/include/linux/nvme-fc.h +++ b/include/linux/nvme-fc.h @@ -334,5 +334,24 @@ struct fcnvme_ls_disconnect_acc { #define NVME_FC_LS_TIMEOUT_SEC 2 /* 2 seconds */ #define NVME_FC_TGTOP_TIMEOUT_SEC 2 /* 2 seconds */ +/* + * TRADDR string must be of form "nn-<16hexdigits>:pn-<16hexdigits>" + * the string is allowed to be specified with or without a "0x" prefix + * infront of the <16hexdigits>. Without is considered the "min" string + * and with is considered the "max" string. The hexdigits may be upper + * or lower case. + */ +#define NVME_FC_TRADDR_NNLEN 3 /* "?n-" */ +#define NVME_FC_TRADDR_OXNNLEN 5 /* "?n-0x" */ +#define NVME_FC_TRADDR_HEXNAMELEN 16 +#define NVME_FC_TRADDR_MINLENGTH \ + (2 * (NVME_FC_TRADDR_NNLEN + NVME_FC_TRADDR_HEXNAMELEN) + 1) +#define NVME_FC_TRADDR_MAXLENGTH \ + (2 * (NVME_FC_TRADDR_OXNNLEN + NVME_FC_TRADDR_HEXNAMELEN) + 1) +#define NVME_FC_TRADDR_MIN_PN_OFFSET \ + (NVME_FC_TRADDR_NNLEN + NVME_FC_TRADDR_HEXNAMELEN + 1) +#define NVME_FC_TRADDR_MAX_PN_OFFSET \ + (NVME_FC_TRADDR_OXNNLEN + NVME_FC_TRADDR_HEXNAMELEN + 1) + #endif /* _NVME_FC_H */ |