microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность

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>
This commit is contained in:
James Smart 2017-07-17 13:59:39 -07:00 коммит произвёл Christoph Hellwig
Родитель 8b25f35192
Коммит 9c5358e15c
3 изменённых файлов: 125 добавлений и 97 удалений
Показать статистику Скачать Patch файл Скачать Diff файл Показать все файлы Свернуть все файлы

102
drivers/nvme/host/fc.c
Просмотреть файл

@ -2805,66 +2805,70 @@ out_fail:
return ERR_PTR(ret);
}
enum {
FCT_TRADDR_ERR = 0,
FCT_TRADDR_WWNN = 1 << 0,
FCT_TRADDR_WWPN = 1 << 1,
};
struct nvmet_fc_traddr {
u64 nn;
u64 pn;
};
static const match_table_t traddr_opt_tokens = {
{ FCT_TRADDR_WWNN, "nn-%s" },
{ FCT_TRADDR_WWPN, "pn-%s" },
{ FCT_TRADDR_ERR, NULL }
};
static int
nvme_fc_parse_address(struct nvmet_fc_traddr *traddr, char *buf)
__nvme_fc_parse_u64(substring_t *sstr, u64 *val)
{
substring_t args[MAX_OPT_ARGS];
char *options, *o, *p;
int token, ret = 0;
u64 token64;
options = o = kstrdup(buf, GFP_KERNEL);
if (!options)
return -ENOMEM;
if (match_u64(sstr, &token64))
return -EINVAL;
*val = token64;
while ((p = strsep(&o, ":\n")) != NULL) {
if (!*p)
continue;
return 0;
}
token = match_token(p, traddr_opt_tokens, args);
switch (token) {
case FCT_TRADDR_WWNN:
if (match_u64(args, &token64)) {
ret = -EINVAL;
goto out;
}
traddr->nn = token64;
break;
case FCT_TRADDR_WWPN:
if (match_u64(args, &token64)) {
ret = -EINVAL;
goto out;
}
traddr->pn = token64;
break;
default:
pr_warn("unknown traddr token or missing value '%s'\n",
p);
ret = -EINVAL;
goto out;
}
}
/*
* This routine validates and extracts the WWN's from the TRADDR string.
* As kernel parsers need the 0x to determine number base, universally
* build string to parse with 0x prefix before parsing name strings.
*/
static int
nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen)
{
char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1];
substring_t wwn = { name, &name[sizeof(name)-1] };
int nnoffset, pnoffset;
out:
kfree(options);
return ret;
/* validate it string one of the 2 allowed formats */
if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH &&
!strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) &&
!strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET],
"pn-0x", NVME_FC_TRADDR_OXNNLEN)) {
nnoffset = NVME_FC_TRADDR_OXNNLEN;
pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET +
NVME_FC_TRADDR_OXNNLEN;
} else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH &&
!strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) &&
!strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET],
"pn-", NVME_FC_TRADDR_NNLEN))) {
nnoffset = NVME_FC_TRADDR_NNLEN;
pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN;
} else
goto out_einval;
name[0] = '0';
name[1] = 'x';
name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0;
memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN);
if (__nvme_fc_parse_u64(&wwn, &traddr->nn))
goto out_einval;
memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN);
if (__nvme_fc_parse_u64(&wwn, &traddr->pn))
goto out_einval;
return 0;
out_einval:
pr_warn("%s: bad traddr string\n", __func__);
return -EINVAL;
}
static struct nvme_ctrl *
@ -2878,11 +2882,11 @@ nvme_fc_create_ctrl(struct device *dev, struct nvmf_ctrl_options *opts)
unsigned long flags;
int ret;
ret = nvme_fc_parse_address(&raddr, opts->traddr);
ret = nvme_fc_parse_traddr(&raddr, opts->traddr, NVMF_TRADDR_SIZE);
if (ret || !raddr.nn || !raddr.pn)
return ERR_PTR(-EINVAL);
ret = nvme_fc_parse_address(&laddr, opts->host_traddr);
ret = nvme_fc_parse_traddr(&laddr, opts->host_traddr, NVMF_TRADDR_SIZE);
if (ret || !laddr.nn || !laddr.pn)
return ERR_PTR(-EINVAL);

101
drivers/nvme/target/fc.c
Просмотреть файл

@ -2293,66 +2293,70 @@ nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *target_port,
}
EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_abort);
enum {
FCT_TRADDR_ERR = 0,
FCT_TRADDR_WWNN = 1 << 0,
FCT_TRADDR_WWPN = 1 << 1,
};
struct nvmet_fc_traddr {
u64 nn;
u64 pn;
};
static const match_table_t traddr_opt_tokens = {
{ FCT_TRADDR_WWNN, "nn-%s" },
{ FCT_TRADDR_WWPN, "pn-%s" },
{ FCT_TRADDR_ERR, NULL }
};
static int
nvmet_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf)
__nvme_fc_parse_u64(substring_t *sstr, u64 *val)
{
substring_t args[MAX_OPT_ARGS];
char *options, *o, *p;
int token, ret = 0;
u64 token64;
options = o = kstrdup(buf, GFP_KERNEL);
if (!options)
return -ENOMEM;
if (match_u64(sstr, &token64))
return -EINVAL;
*val = token64;
while ((p = strsep(&o, ":\n")) != NULL) {
if (!*p)
continue;
return 0;
}
token = match_token(p, traddr_opt_tokens, args);
switch (token) {
case FCT_TRADDR_WWNN:
if (match_u64(args, &token64)) {
ret = -EINVAL;
goto out;
}
traddr->nn = token64;
break;
case FCT_TRADDR_WWPN:
if (match_u64(args, &token64)) {
ret = -EINVAL;
goto out;
}
traddr->pn = token64;
break;
default:
pr_warn("unknown traddr token or missing value '%s'\n",
p);
ret = -EINVAL;
goto out;
}
}
/*
* This routine validates and extracts the WWN's from the TRADDR string.
* As kernel parsers need the 0x to determine number base, universally
* build string to parse with 0x prefix before parsing name strings.
*/
static int
nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen)
{
char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1];
substring_t wwn = { name, &name[sizeof(name)-1] };
int nnoffset, pnoffset;
out:
kfree(options);
return ret;
/* validate it string one of the 2 allowed formats */
if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH &&
!strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) &&
!strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET],
"pn-0x", NVME_FC_TRADDR_OXNNLEN)) {
nnoffset = NVME_FC_TRADDR_OXNNLEN;
pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET +
NVME_FC_TRADDR_OXNNLEN;
} else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH &&
!strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) &&
!strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET],
"pn-", NVME_FC_TRADDR_NNLEN))) {
nnoffset = NVME_FC_TRADDR_NNLEN;
pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN;
} else
goto out_einval;
name[0] = '0';
name[1] = 'x';
name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0;
memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN);
if (__nvme_fc_parse_u64(&wwn, &traddr->nn))
goto out_einval;
memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN);
if (__nvme_fc_parse_u64(&wwn, &traddr->pn))
goto out_einval;
return 0;
out_einval:
pr_warn("%s: bad traddr string\n", __func__);
return -EINVAL;
}
static int
@ -2370,7 +2374,8 @@ nvmet_fc_add_port(struct nvmet_port *port)
/* map the traddr address info to a target port */
ret = nvmet_fc_parse_traddr(&traddr, port->disc_addr.traddr);
ret = nvme_fc_parse_traddr(&traddr, port->disc_addr.traddr,
sizeof(port->disc_addr.traddr));
if (ret)
return ret;

19
include/linux/nvme-fc.h
Просмотреть файл

@ -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 */