From e86b48aa46d4f0df25bb02789647d0ce61551a4d Mon Sep 17 00:00:00 2001
From: Ivan Malov <ivan.malov@oktetlabs.ru>
Date: Tue, 20 Oct 2020 10:13:22 +0100
Subject: [PATCH] net/sfc: add HW switch ID helpers

The driver will need a means to figure out relationship between
RTE ethdev instances and underlying HW switch entities. For now,
use board serial number string as a unique HW switch identifier.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>
---
 drivers/net/sfc/sfc.c | 44 +++++++++++++++++++++++++++++++++++++++++++
 drivers/net/sfc/sfc.h |  8 ++++++++
 2 files changed, 52 insertions(+)

diff --git a/drivers/net/sfc/sfc.c b/drivers/net/sfc/sfc.c
index 3b896490f7..a4fe495788 100644
--- a/drivers/net/sfc/sfc.c
+++ b/drivers/net/sfc/sfc.c
@@ -1259,3 +1259,47 @@ sfc_register_logtype(const struct rte_pci_addr *pci_addr,
 
 	return ret;
 }
+
+struct sfc_hw_switch_id {
+	char	board_sn[RTE_SIZEOF_FIELD(efx_nic_board_info_t, enbi_serial)];
+};
+
+int
+sfc_hw_switch_id_init(struct sfc_adapter *sa,
+		      struct sfc_hw_switch_id **idp)
+{
+	efx_nic_board_info_t board_info;
+	struct sfc_hw_switch_id *id;
+	int rc;
+
+	if (idp == NULL)
+		return EINVAL;
+
+	id = rte_zmalloc("sfc_hw_switch_id", sizeof(*id), 0);
+	if (id == NULL)
+		return ENOMEM;
+
+	rc = efx_nic_get_board_info(sa->nic, &board_info);
+	if (rc != 0)
+		return rc;
+
+	memcpy(id->board_sn, board_info.enbi_serial, sizeof(id->board_sn));
+
+	*idp = id;
+
+	return 0;
+}
+
+void
+sfc_hw_switch_id_fini(__rte_unused struct sfc_adapter *sa,
+		      struct sfc_hw_switch_id *id)
+{
+	rte_free(id);
+}
+
+bool
+sfc_hw_switch_ids_equal(const struct sfc_hw_switch_id *left,
+			const struct sfc_hw_switch_id *right)
+{
+	return strcmp(left->board_sn, right->board_sn) == 0;
+}
diff --git a/drivers/net/sfc/sfc.h b/drivers/net/sfc/sfc.h
index 4b5d687108..ed059e142f 100644
--- a/drivers/net/sfc/sfc.h
+++ b/drivers/net/sfc/sfc.h
@@ -403,6 +403,14 @@ int sfc_port_reset_mac_stats(struct sfc_adapter *sa);
 int sfc_set_rx_mode(struct sfc_adapter *sa);
 int sfc_set_rx_mode_unchecked(struct sfc_adapter *sa);
 
+struct sfc_hw_switch_id;
+
+int sfc_hw_switch_id_init(struct sfc_adapter *sa,
+			  struct sfc_hw_switch_id **idp);
+void sfc_hw_switch_id_fini(struct sfc_adapter *sa,
+			   struct sfc_hw_switch_id *idp);
+bool sfc_hw_switch_ids_equal(const struct sfc_hw_switch_id *left,
+			     const struct sfc_hw_switch_id *right);
 
 #ifdef __cplusplus
 }