IB/uverbs: Add flow_action create and destroy verbs

A verbs application may receive and transmits packets using a data
path pipeline. Sometimes, the first stage in the receive pipeline or
the last stage in the transmit pipeline involves transforming a
packet, either in order to make it easier for later stages to process
it or to prepare it for transmission over the wire. Such transformation
could be stripping/encapsulating the packet (i.e. vxlan),
decrypting/encrypting it (i.e. ipsec), altering headers, doing some
complex FPGA changes, etc.

Some hardware could do such transformations without software data path
intervention at all. The flow steering API supports steering a
packet (either to a QP or dropping it) and some simple packet
immutable actions (i.e. tagging a packet). Complex actions, that may
change the packet, could bloat the flow steering API extensively.
Sometimes the same action should be applied to several flows.
In this case, it's easier to bind several flows to the same action and
modify it than change all matching flows.

Introducing a new flow_action object that abstracts any packet
transformation (out of a standard and well defined set of actions).
This flow_action object could be tied to a flow steering rule via a
new specification.

Currently, we support esp flow_action, which encrypts or decrypts a
packet according to the given parameters. However, we present a
flexible schema that could be used to other transformation actions tied
to flow rules.

Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

2 files changed, 78 insertions, 0 deletions

diff --git a/include/uapi/rdma/ib_user_ioctl_cmds.h b/include/uapi/rdma/ib_user_ioctl_cmds.h
index 77bbbed17ed5..d3a2c03ea4a8 100644
--- a/include/uapi/rdma/ib_user_ioctl_cmds.h
+++ b/include/uapi/rdma/ib_user_ioctl_cmds.h
@@ -53,6 +53,7 @@ enum uverbs_default_objects {
 	UVERBS_OBJECT_XRCD,
 	UVERBS_OBJECT_RWQ_IND_TBL,
 	UVERBS_OBJECT_WQ,
+	UVERBS_OBJECT_FLOW_ACTION,
 };
 
 enum {
@@ -75,9 +76,27 @@ enum uverbs_attrs_destroy_cq_cmd_attr_ids {
 	UVERBS_ATTR_DESTROY_CQ_RESP,
 };
 
+enum uverbs_attrs_create_flow_action_esp {
+	UVERBS_ATTR_FLOW_ACTION_ESP_HANDLE,
+	UVERBS_ATTR_FLOW_ACTION_ESP_ATTRS,
+	UVERBS_ATTR_FLOW_ACTION_ESP_ESN,
+	UVERBS_ATTR_FLOW_ACTION_ESP_KEYMAT,
+	UVERBS_ATTR_FLOW_ACTION_ESP_REPLAY,
+	UVERBS_ATTR_FLOW_ACTION_ESP_ENCAP,
+};
+
+enum uverbs_attrs_destroy_flow_action_esp {
+	UVERBS_ATTR_DESTROY_FLOW_ACTION_HANDLE,
+};
+
 enum uverbs_methods_cq {
 	UVERBS_METHOD_CQ_CREATE,
 	UVERBS_METHOD_CQ_DESTROY,
 };
 
+enum uverbs_methods_actions_flow_action_ops {
+	UVERBS_METHOD_FLOW_ACTION_ESP_CREATE,
+	UVERBS_METHOD_FLOW_ACTION_DESTROY,
+};
+
 #endif
diff --git a/include/uapi/rdma/ib_user_ioctl_verbs.h b/include/uapi/rdma/ib_user_ioctl_verbs.h
index 173629ecc09b..04e46ea517d3 100644
--- a/include/uapi/rdma/ib_user_ioctl_verbs.h
+++ b/include/uapi/rdma/ib_user_ioctl_verbs.h
@@ -40,4 +40,63 @@
 #define RDMA_UAPI_PTR(_type, _name)	__aligned_u64 _name
 #endif
 
+enum ib_uverbs_flow_action_esp_keymat {
+	IB_UVERBS_FLOW_ACTION_ESP_KEYMAT_AES_GCM,
+};
+
+enum ib_uverbs_flow_action_esp_keymat_aes_gcm_iv_algo {
+	IB_UVERBS_FLOW_ACTION_IV_ALGO_SEQ,
+};
+
+struct ib_uverbs_flow_action_esp_keymat_aes_gcm {
+	__aligned_u64	iv;
+	__u32		iv_algo; /* Use enum ib_uverbs_flow_action_esp_keymat_aes_gcm_iv_algo */
+
+	__u32		salt;
+	__u32		icv_len;
+
+	__u32		key_len;
+	__u32		aes_key[256 / 32];
+};
+
+enum ib_uverbs_flow_action_esp_replay {
+	IB_UVERBS_FLOW_ACTION_ESP_REPLAY_NONE,
+	IB_UVERBS_FLOW_ACTION_ESP_REPLAY_BMP,
+};
+
+struct ib_uverbs_flow_action_esp_replay_bmp {
+	__u32	size;
+};
+
+enum ib_uverbs_flow_action_esp_flags {
+	IB_UVERBS_FLOW_ACTION_ESP_FLAGS_INLINE_CRYPTO	= 0UL << 0,	/* Default */
+	IB_UVERBS_FLOW_ACTION_ESP_FLAGS_FULL_OFFLOAD	= 1UL << 0,
+
+	IB_UVERBS_FLOW_ACTION_ESP_FLAGS_TUNNEL		= 0UL << 1,	/* Default */
+	IB_UVERBS_FLOW_ACTION_ESP_FLAGS_TRANSPORT	= 1UL << 1,
+
+	IB_UVERBS_FLOW_ACTION_ESP_FLAGS_DECRYPT		= 0UL << 2,	/* Default */
+	IB_UVERBS_FLOW_ACTION_ESP_FLAGS_ENCRYPT		= 1UL << 2,
+
+	IB_UVERBS_FLOW_ACTION_ESP_FLAGS_ESN_NEW_WINDOW	= 1UL << 3,
+};
+
+struct ib_uverbs_flow_action_esp_encap {
+	/* This struct represents a list of pointers to flow_xxxx_filter that
+	 * encapsulates the payload in ESP tunnel mode.
+	 */
+	RDMA_UAPI_PTR(void *, val_ptr); /* pointer to a flow_xxxx_filter */
+	RDMA_UAPI_PTR(struct ib_uverbs_flow_action_esp_encap *, next_ptr);
+	__u16	len;		/* Len of the filter struct val_ptr points to */
+	__u16	type;		/* Use flow_spec_type enum */
+};
+
+struct ib_uverbs_flow_action_esp {
+	__u32		spi;
+	__u32		seq;
+	__u32		tfc_pad;
+	__u32		flags;
+	__aligned_u64	hard_limit_pkts;
+};
+
 #endif