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Commit 8c95f773 authored by Sathya Perla's avatar Sathya Perla Committed by David S. Miller
Browse files

bnxt_en: add support for Flower based vxlan encap/decap offload 



This patch adds IPv4 vxlan encap/decap action support to TC-flower
offload.

For vxlan encap, the driver maintains a tunnel encap hash-table.
When a new flow with a tunnel encap action arrives, this table
is looked up; if an encap entry exists, it uses the already
programmed encap_record_handle as the tunnel_handle in the
hwrm_cfa_flow_alloc cmd. Else, a new encap node is added and the
L2 header fields are queried via a route lookup.
hwrm_cfa_encap_record_alloc cmd is used to create a new encap
record and the encap_record_handle is used as the tunnel_handle
while adding the flow.

For vxlan decap, the driver maintains a tunnel decap hash-table.
When a new flow with a tunnel decap action arrives, this table
is looked up; if a decap entry exists, it uses the already
programmed decap_filter_handle as the tunnel_handle in the
hwrm_cfa_flow_alloc cmd. Else, a new decap node is added and
a decap_filter_handle is alloc'd via the hwrm_cfa_decap_filter_alloc
cmd. This handle is used as the tunnel_handle while adding the flow.

The code to issue the HWRM FW cmds is introduced in a follow-up patch.

Signed-off-by: default avatarSathya Perla <sathya.perla@broadcom.com>
Signed-off-by: default avatarMichael Chan <michael.chan@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f8503969

drivers/net/ethernet/broadcom/bnxt/bnxt.h

+9 −0
Original line number Diff line number Diff line
@@ -965,6 +965,15 @@ struct bnxt_tc_info { 
	/* hash table to store L2 keys of TC flows */

	struct rhashtable		l2_table;

	struct rhashtable_params	l2_ht_params;

	/* hash table to store L2 keys for TC tunnel decap */

	struct rhashtable		decap_l2_table;

	struct rhashtable_params	decap_l2_ht_params;

	/* hash table to store tunnel decap entries */

	struct rhashtable		decap_table;

	struct rhashtable_params	decap_ht_params;

	/* hash table to store tunnel encap entries */

	struct rhashtable		encap_table;

	struct rhashtable_params	encap_ht_params;



	/* lock to atomically add/del an l2 node when a flow is

	 * added or deleted.

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

+1 −1
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ int bnxt_dl_register(struct bnxt *bp) 
	if (!pci_find_ext_capability(bp->pdev, PCI_EXT_CAP_ID_SRIOV))

		return 0;



	if (bp->hwrm_spec_code < 0x10800) {

	if (bp->hwrm_spec_code < 0x10803) {

		netdev_warn(bp->dev, "Firmware does not support SR-IOV E-Switch SWITCHDEV mode.\n");

		return -ENOTSUPP;

	}

drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c

+559 −7

File changed.

Preview size limit exceeded, changes collapsed.

drivers/net/ethernet/broadcom/bnxt/bnxt_tc.h

+62 −4
Original line number Diff line number Diff line
@@ -12,6 +12,8 @@ 


#ifdef CONFIG_BNXT_FLOWER_OFFLOAD



#include <net/ip_tunnels.h>



/* Structs used for storing the filter/actions of the TC cmd.

 */

struct bnxt_tc_l2_key {
@@ -50,6 +52,13 @@ struct bnxt_tc_l4_key { 
	};

};



struct bnxt_tc_tunnel_key {

	struct bnxt_tc_l2_key	l2;

	struct bnxt_tc_l3_key	l3;

	struct bnxt_tc_l4_key	l4;

	__be32			id;

};



struct bnxt_tc_actions {

	u32				flags;

#define BNXT_TC_ACTION_FLAG_FWD			BIT(0)
@@ -57,11 +66,16 @@ struct bnxt_tc_actions { 
#define BNXT_TC_ACTION_FLAG_PUSH_VLAN		BIT(3)

#define BNXT_TC_ACTION_FLAG_POP_VLAN		BIT(4)

#define BNXT_TC_ACTION_FLAG_DROP		BIT(5)

#define BNXT_TC_ACTION_FLAG_TUNNEL_ENCAP	BIT(6)

#define BNXT_TC_ACTION_FLAG_TUNNEL_DECAP	BIT(7)



	u16				dst_fid;

	struct net_device		*dst_dev;

	__be16				push_vlan_tpid;

	__be16				push_vlan_tci;



	/* tunnel encap */

	struct ip_tunnel_key		tun_encap_key;

};



struct bnxt_tc_flow_stats {
@@ -76,6 +90,16 @@ struct bnxt_tc_flow { 
#define BNXT_TC_FLOW_FLAGS_IPV6_ADDRS		BIT(3)

#define BNXT_TC_FLOW_FLAGS_PORTS		BIT(4)

#define BNXT_TC_FLOW_FLAGS_ICMP			BIT(5)

#define BNXT_TC_FLOW_FLAGS_TUNL_ETH_ADDRS	BIT(6)

#define BNXT_TC_FLOW_FLAGS_TUNL_IPV4_ADDRS	BIT(7)

#define BNXT_TC_FLOW_FLAGS_TUNL_IPV6_ADDRS	BIT(8)

#define BNXT_TC_FLOW_FLAGS_TUNL_PORTS		BIT(9)

#define BNXT_TC_FLOW_FLAGS_TUNL_ID		BIT(10)

#define BNXT_TC_FLOW_FLAGS_TUNNEL	(BNXT_TC_FLOW_FLAGS_TUNL_ETH_ADDRS | \

					 BNXT_TC_FLOW_FLAGS_TUNL_IPV4_ADDRS | \

					 BNXT_TC_FLOW_FLAGS_TUNL_IPV6_ADDRS |\

					 BNXT_TC_FLOW_FLAGS_TUNL_PORTS |\

					 BNXT_TC_FLOW_FLAGS_TUNL_ID)



	/* flow applicable to pkts ingressing on this fid */

	u16				src_fid;
@@ -85,6 +109,8 @@ struct bnxt_tc_flow { 
	struct bnxt_tc_l3_key		l3_mask;

	struct bnxt_tc_l4_key		l4_key;

	struct bnxt_tc_l4_key		l4_mask;

	struct ip_tunnel_key		tun_key;

	struct ip_tunnel_key		tun_mask;



	struct bnxt_tc_actions		actions;
@@ -95,11 +121,33 @@ struct bnxt_tc_flow { 
	unsigned long			lastused; /* jiffies */

};



/* Tunnel encap/decap hash table

 * This table is used to maintain a list of flows that use

 * the same tunnel encap/decap params (ip_daddrs, vni, udp_dport)

 * and the FW returned handle.

 * A separate table is maintained for encap and decap

 */

struct bnxt_tc_tunnel_node {

	struct ip_tunnel_key		key;

	struct rhash_head		node;



	/* tunnel l2 info */

	struct bnxt_tc_l2_key		l2_info;



#define	INVALID_TUNNEL_HANDLE		cpu_to_le32(0xffffffff)

	/* tunnel handle returned by FW */

	__le32				tunnel_handle;



	u32				refcount;

	struct rcu_head			rcu;

};



/* L2 hash table

 * This data-struct is used for L2-flow table.

 * The L2 part of a flow is stored in a hash table.

 * The same data-struct is used for L2-flow table and L2-tunnel table.

 * The L2 part of a flow or tunnel is stored in a hash table.

 * A flow that shares the same L2 key/mask with an

 * already existing flow must refer to it's flow handle.

 * already existing flow/tunnel must refer to it's flow handle or

 * decap_filter_id respectively.

 */

struct bnxt_tc_l2_node {

	/* hash key: first 16b of key */
@@ -110,7 +158,7 @@ struct bnxt_tc_l2_node { 
	/* a linked list of flows that share the same l2 key */

	struct list_head	common_l2_flows;



	/* number of flows sharing the l2 key */

	/* number of flows/tunnels sharing the l2 key */

	u16			refcount;



	struct rcu_head		rcu;
@@ -130,6 +178,16 @@ struct bnxt_tc_flow_node { 
	/* for the shared_flows list maintained in l2_node */

	struct list_head		l2_list_node;



	/* tunnel encap related */

	struct bnxt_tc_tunnel_node	*encap_node;



	/* tunnel decap related */

	struct bnxt_tc_tunnel_node	*decap_node;

	/* L2 node in tunnel-l2 hashtable that shares flow's tunnel l2 key */

	struct bnxt_tc_l2_node		*decap_l2_node;

	/* for the shared_flows list maintained in tunnel decap l2_node */

	struct list_head		decap_l2_list_node;



	struct rcu_head			rcu;

};