From: Dirk van der Merwe <dirk.vanderme...@netronome.com>
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.vanderme...@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicin...@netronome.com>
---
.../ethernet/netronome/nfp/nfpcore/nfp_nsp.c | 62 +++++++++++++++++++
.../ethernet/netronome/nfp/nfpcore/nfp_nsp.h | 8 +++
2 files changed, 70 insertions(+)
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index 3a4e224a64b7..42cf4fd875ea 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -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;
+}
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
index bd9c358c646f..22ee6985ee1c 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -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,
--
2.21.0
