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nfp: nsp: implement read SFF module EEPROM

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The NSP now provides the ability to read from the SFF module EEPROM.
Note that even if an error occurs, the NSP may still provide some of the
data.

Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dirk van der Merwe 2019-03-29 19:24:42 -07:00 committed by David S. Miller
parent eff07b42d8
commit 593cb18285
2 changed files with 70 additions and 0 deletions
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62
drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
View File

@ -79,6 +79,8 @@
#define NFP_VERSIONS_NCSI_OFF 22
#define NFP_VERSIONS_CFGR_OFF 26
#define NSP_SFF_EEPROM_BLOCK_LEN 8
enum nfp_nsp_cmd {
SPCODE_NOOP = 0, /* No operation */
SPCODE_SOFT_RESET = 1, /* Soft reset the NFP */
@ -95,6 +97,7 @@ enum nfp_nsp_cmd {
SPCODE_FW_STORED = 16, /* If no FW loaded, load flash app FW */
SPCODE_HWINFO_LOOKUP = 17, /* Lookup HWinfo with overwrites etc. */
SPCODE_VERSIONS = 21, /* Report FW versions */
SPCODE_READ_SFF_EEPROM = 22, /* Read module EEPROM */
};
struct nfp_nsp_dma_buf {
@ -965,3 +968,62 @@ const char *nfp_nsp_versions_get(enum nfp_nsp_versions id, bool flash,
return (const char *)&buf[buf_off];
}
static int
__nfp_nsp_module_eeprom(struct nfp_nsp *state, void *buf, unsigned int size)
{
struct nfp_nsp_command_buf_arg module_eeprom = {
{
.code = SPCODE_READ_SFF_EEPROM,
.option = size,
},
.in_buf = buf,
.in_size = size,
.out_buf = buf,
.out_size = size,
};
return nfp_nsp_command_buf(state, &module_eeprom);
}
int nfp_nsp_read_module_eeprom(struct nfp_nsp *state, int eth_index,
unsigned int offset, void *data,
unsigned int len, unsigned int *read_len)
{
struct eeprom_buf {
u8 metalen;
__le16 length;
__le16 offset;
__le16 readlen;
u8 eth_index;
u8 data[0];
} __packed *buf;
int bufsz, ret;
BUILD_BUG_ON(offsetof(struct eeprom_buf, data) % 8);
/* Buffer must be large enough and rounded to the next block size. */
bufsz = struct_size(buf, data, round_up(len, NSP_SFF_EEPROM_BLOCK_LEN));
buf = kzalloc(bufsz, GFP_KERNEL);
if (!buf)
return -ENOMEM;
buf->metalen =
offsetof(struct eeprom_buf, data) / NSP_SFF_EEPROM_BLOCK_LEN;
buf->length = cpu_to_le16(len);
buf->offset = cpu_to_le16(offset);
buf->eth_index = eth_index;
ret = __nfp_nsp_module_eeprom(state, buf, bufsz);
*read_len = min_t(unsigned int, len, le16_to_cpu(buf->readlen));
if (*read_len)
memcpy(data, buf->data, *read_len);
if (!ret && *read_len < len)
ret = -EIO;
kfree(buf);
return ret;
}

8
drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
View File

@ -22,6 +22,9 @@ int nfp_nsp_write_flash(struct nfp_nsp *state, const struct firmware *fw);
int nfp_nsp_mac_reinit(struct nfp_nsp *state);
int nfp_nsp_load_stored_fw(struct nfp_nsp *state);
int nfp_nsp_hwinfo_lookup(struct nfp_nsp *state, void *buf, unsigned int size);
int nfp_nsp_read_module_eeprom(struct nfp_nsp *state, int eth_index,
unsigned int offset, void *data,
unsigned int len, unsigned int *read_len);
static inline bool nfp_nsp_has_mac_reinit(struct nfp_nsp *state)
{
@ -43,6 +46,11 @@ static inline bool nfp_nsp_has_versions(struct nfp_nsp *state)
return nfp_nsp_get_abi_ver_minor(state) > 27;
}
static inline bool nfp_nsp_has_read_module_eeprom(struct nfp_nsp *state)
{
return nfp_nsp_get_abi_ver_minor(state) > 28;
}
enum nfp_eth_interface {
NFP_INTERFACE_NONE = 0,
NFP_INTERFACE_SFP = 1,