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virtchnl: Add compile time static asserts to validate structure sizes

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This uses preprocessor tricks to make sure that a divide by zero
occurs if a struct changes size outside the expected number of
bytes.

Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Sridhar Samudrala 2017-05-11 11:23:19 -07:00 committed by Jeff Kirsher
parent a33c83c435
commit 73556269aa
1 changed files with 50 additions and 0 deletions
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50
include/linux/avf/virtchnl.h
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@ -135,6 +135,14 @@ enum virtchnl_ops {
VIRTCHNL_OP_SET_RSS_HENA = 26,
};
/* This macro is used to generate a compilation error if a structure
* is not exactly the correct length. It gives a divide by zero error if the
* structure is not of the correct size, otherwise it creates an enum that is
* never used.
*/
#define VIRTCHNL_CHECK_STRUCT_LEN(n, X) enum virtchnl_static_assert_enum_##X \
{ virtchnl_static_assert_##X = (n)/((sizeof(struct X) == (n)) ? 1 : 0) }
/* Virtual channel message descriptor. This overlays the admin queue
* descriptor. All other data is passed in external buffers.
*/
@ -146,6 +154,8 @@ struct virtchnl_msg {
u32 vfid; /* used by PF when sending to VF */
};
VIRTCHNL_CHECK_STRUCT_LEN(20, virtchnl_msg);
/* Message descriptions and data structures.*/
/* VIRTCHNL_OP_VERSION
@ -169,6 +179,8 @@ struct virtchnl_version_info {
u32 minor;
};
VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_version_info);
#define VF_IS_V10(_v) (((_v)->major == 1) && ((_v)->minor == 0))
#define VF_IS_V11(_ver) (((_ver)->major == 1) && ((_ver)->minor == 1))
@ -209,6 +221,8 @@ struct virtchnl_vsi_resource {
u8 default_mac_addr[ETH_ALEN];
};
VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_vsi_resource);
/* VF offload flags
* VIRTCHNL_VF_OFFLOAD_L2 flag is inclusive of base mode L2 offloads including
* TX/RX Checksum offloading and TSO for non-tunnelled packets.
@ -244,6 +258,8 @@ struct virtchnl_vf_resource {
struct virtchnl_vsi_resource vsi_res[1];
};
VIRTCHNL_CHECK_STRUCT_LEN(36, virtchnl_vf_resource);
/* VIRTCHNL_OP_CONFIG_TX_QUEUE
* VF sends this message to set up parameters for one TX queue.
* External data buffer contains one instance of virtchnl_txq_info.
@ -260,6 +276,8 @@ struct virtchnl_txq_info {
u64 dma_headwb_addr; /* deprecated with AVF 1.0 */
};
VIRTCHNL_CHECK_STRUCT_LEN(24, virtchnl_txq_info);
/* VIRTCHNL_OP_CONFIG_RX_QUEUE
* VF sends this message to set up parameters for one RX queue.
* External data buffer contains one instance of virtchnl_rxq_info.
@ -281,6 +299,8 @@ struct virtchnl_rxq_info {
u32 pad2;
};
VIRTCHNL_CHECK_STRUCT_LEN(40, virtchnl_rxq_info);
/* VIRTCHNL_OP_CONFIG_VSI_QUEUES
* VF sends this message to set parameters for all active TX and RX queues
* associated with the specified VSI.
@ -294,6 +314,8 @@ struct virtchnl_queue_pair_info {
struct virtchnl_rxq_info rxq;
};
VIRTCHNL_CHECK_STRUCT_LEN(64, virtchnl_queue_pair_info);
struct virtchnl_vsi_queue_config_info {
u16 vsi_id;
u16 num_queue_pairs;
@ -301,6 +323,8 @@ struct virtchnl_vsi_queue_config_info {
struct virtchnl_queue_pair_info qpair[1];
};
VIRTCHNL_CHECK_STRUCT_LEN(72, virtchnl_vsi_queue_config_info);
/* VIRTCHNL_OP_CONFIG_IRQ_MAP
* VF uses this message to map vectors to queues.
* The rxq_map and txq_map fields are bitmaps used to indicate which queues
@ -317,11 +341,15 @@ struct virtchnl_vector_map {
u16 txitr_idx;
};
VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_vector_map);
struct virtchnl_irq_map_info {
u16 num_vectors;
struct virtchnl_vector_map vecmap[1];
};
VIRTCHNL_CHECK_STRUCT_LEN(14, virtchnl_irq_map_info);
/* VIRTCHNL_OP_ENABLE_QUEUES
* VIRTCHNL_OP_DISABLE_QUEUES
* VF sends these message to enable or disable TX/RX queue pairs.
@ -337,6 +365,8 @@ struct virtchnl_queue_select {
u32 tx_queues;
};
VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_queue_select);
/* VIRTCHNL_OP_ADD_ETH_ADDR
* VF sends this message in order to add one or more unicast or multicast
* address filters for the specified VSI.
@ -354,12 +384,16 @@ struct virtchnl_ether_addr {
u8 pad[2];
};
VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_ether_addr);
struct virtchnl_ether_addr_list {
u16 vsi_id;
u16 num_elements;
struct virtchnl_ether_addr list[1];
};
VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_ether_addr_list);
/* VIRTCHNL_OP_ADD_VLAN
* VF sends this message to add one or more VLAN tag filters for receives.
* PF adds the filters and returns status.
@ -380,6 +414,8 @@ struct virtchnl_vlan_filter_list {
u16 vlan_id[1];
};
VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_vlan_filter_list);
/* VIRTCHNL_OP_CONFIG_PROMISCUOUS_MODE
* VF sends VSI id and flags.
* PF returns status code in retval.
@ -390,6 +426,8 @@ struct virtchnl_promisc_info {
u16 flags;
};
VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_promisc_info);
#define FLAG_VF_UNICAST_PROMISC 0x00000001
#define FLAG_VF_MULTICAST_PROMISC 0x00000002
@ -416,12 +454,16 @@ struct virtchnl_rss_key {
u8 key[1]; /* RSS hash key, packed bytes */
};
VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_rss_key);
struct virtchnl_rss_lut {
u16 vsi_id;
u16 lut_entries;
u8 lut[1]; /* RSS lookup table*/
};
VIRTCHNL_CHECK_STRUCT_LEN(6, virtchnl_rss_lut);
/* VIRTCHNL_OP_GET_RSS_HENA_CAPS
* VIRTCHNL_OP_SET_RSS_HENA
* VF sends these messages to get and set the hash filter enable bits for RSS.
@ -433,6 +475,8 @@ struct virtchnl_rss_hena {
u64 hena;
};
VIRTCHNL_CHECK_STRUCT_LEN(8, virtchnl_rss_hena);
/* VIRTCHNL_OP_EVENT
* PF sends this message to inform the VF driver of events that may affect it.
* No direct response is expected from the VF, though it may generate other
@ -460,6 +504,8 @@ struct virtchnl_pf_event {
int severity;
};
VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_pf_event);
/* VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP
* VF uses this message to request PF to map IWARP vectors to IWARP queues.
* The request for this originates from the VF IWARP driver through
@ -479,11 +525,15 @@ struct virtchnl_iwarp_qv_info {
u8 itr_idx;
};
VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_iwarp_qv_info);
struct virtchnl_iwarp_qvlist_info {
u32 num_vectors;
struct virtchnl_iwarp_qv_info qv_info[1];
};
VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_iwarp_qvlist_info);
/* VF reset states - these are written into the RSTAT register:
* VFGEN_RSTAT on the VF
* When the PF initiates a reset, it writes 0