bnxt_en: Add bnxt_l2_filter hash table.

The current driver only has an array of 4 additional L2 unicast
addresses to support the netdev uc address list.  Generalize and
expand this infrastructure with an L2 address hash table so we can
support an expanded list of unicast addresses (for bridges,
macvlans, OVS, etc).  The L2 hash table infrastructure will also
allow more generalized n-tuple filter support.

This patch creates the bnxt_l2_filter structure and the hash table.
This L2 filter structure has the same bnxt_filter_base structure
as used in the bnxt_ntuple_filter structure.

All currently supported L2 filters will now have an entry in this
new table.

Note that L2 filters may be created for the VF.  VF filters should
not be freed when the PF goes down.  Add some logic in
bnxt_free_l2_filters() to allow keeping the VF filters or to free
everything during rmmod.

Reviewed-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 29 insertions, 1 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 4653abbd2fe4..77c7084e47cd 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1219,7 +1219,7 @@ struct bnxt_vnic_info {
 	u16		fw_rss_cos_lb_ctx[BNXT_MAX_CTX_PER_VNIC];
 	u16		fw_l2_ctx_id;
 #define BNXT_MAX_UC_ADDRS	4
-	__le64		fw_l2_filter_id[BNXT_MAX_UC_ADDRS];
+	struct bnxt_l2_filter *l2_filters[BNXT_MAX_UC_ADDRS];
 				/* index 0 always dev_addr */
 	u16		uc_filter_count;
 	u8		*uc_list;
@@ -1349,6 +1349,8 @@ struct bnxt_filter_base {
 	unsigned long		state;
 #define BNXT_FLTR_VALID		0
 #define BNXT_FLTR_UPDATE	1
+
+	struct rcu_head         rcu;
 };
 
 struct bnxt_ntuple_filter {
@@ -1360,6 +1362,24 @@ struct bnxt_ntuple_filter {
 	u32			flow_id;
 };
 
+struct bnxt_l2_key {
+	union {
+		struct {
+			u8	dst_mac_addr[ETH_ALEN];
+			u16	vlan;
+		};
+		u32	filter_key;
+	};
+};
+
+#define BNXT_L2_KEY_SIZE	(sizeof(struct bnxt_l2_key) / 4)
+
+struct bnxt_l2_filter {
+	struct bnxt_filter_base	base;
+	struct bnxt_l2_key	l2_key;
+	atomic_t		refcnt;
+};
+
 struct bnxt_link_info {
 	u8			phy_type;
 	u8			media_type;
@@ -2388,6 +2408,13 @@ struct bnxt {
 	unsigned long		*ntp_fltr_bmap;
 	int			ntp_fltr_count;
 
+#define BNXT_L2_FLTR_MAX_FLTR	1024
+#define BNXT_L2_FLTR_HASH_SIZE	32
+#define BNXT_L2_FLTR_HASH_MASK	(BNXT_L2_FLTR_HASH_SIZE - 1)
+	struct hlist_head	l2_fltr_hash_tbl[BNXT_L2_FLTR_HASH_SIZE];
+
+	u32			hash_seed;
+
 	/* To protect link related settings during link changes and
 	 * ethtool settings changes.
 	 */
@@ -2595,6 +2622,7 @@ int bnxt_set_rx_skb_mode(struct bnxt *bp, bool page_mode);
 int bnxt_hwrm_func_drv_rgtr(struct bnxt *bp, unsigned long *bmap,
 			    int bmap_size, bool async_only);
 int bnxt_hwrm_func_drv_unrgtr(struct bnxt *bp);
+void bnxt_del_l2_filter(struct bnxt *bp, struct bnxt_l2_filter *fltr);
 int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings);
 int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id);
 int __bnxt_hwrm_get_tx_rings(struct bnxt *bp, u16 fid, int *tx_rings);