/* SPDX-License-Identifier: (GPL-2.0 OR MIT) * Google virtual Ethernet (gve) driver * * Copyright (C) 2015-2021 Google, Inc. */ /* GVE DQO Descriptor formats */ #ifndef _GVE_DESC_DQO_H_ #define _GVE_DESC_DQO_H_ #include <linux/build_bug.h> #define GVE_TX_MAX_HDR_SIZE_DQO … #define GVE_TX_MIN_TSO_MSS_DQO … #ifndef __LITTLE_ENDIAN_BITFIELD #error "Only little endian supported" #endif /* Basic TX descriptor (DTYPE 0x0C) */ struct gve_tx_pkt_desc_dqo { … } __packed; static_assert(…); #define GVE_TX_PKT_DESC_DTYPE_DQO … #define GVE_TX_MAX_BUF_SIZE_DQO … /* Maximum number of data descriptors allowed per packet, or per-TSO segment. */ #define GVE_TX_MAX_DATA_DESCS … /* Min gap between tail and head to avoid cacheline overlap */ #define GVE_TX_MIN_DESC_PREVENT_CACHE_OVERLAP … /* "report_event" on TX packet descriptors may only be reported on the last * descriptor of a TX packet, and they must be spaced apart with at least this * value. */ #define GVE_TX_MIN_RE_INTERVAL … struct gve_tx_context_cmd_dtype { … }; static_assert(…); /* TX Native TSO Context DTYPE (0x05) * * "flex" fields allow the driver to send additional packet context to HW. */ struct gve_tx_tso_context_desc_dqo { … } __packed; static_assert(…); #define GVE_TX_TSO_CTX_DESC_DTYPE_DQO … /* General context descriptor for sending metadata. */ struct gve_tx_general_context_desc_dqo { … } __packed; static_assert(…); #define GVE_TX_GENERAL_CTX_DESC_DTYPE_DQO … /* Logical structure of metadata which is packed into context descriptor flex * fields. */ struct gve_tx_metadata_dqo { … } __packed; static_assert(…); #define GVE_TX_METADATA_VERSION_DQO … /* TX completion descriptor */ struct gve_tx_compl_desc { … } __packed; static_assert(…); #define GVE_COMPL_TYPE_DQO_PKT … #define GVE_COMPL_TYPE_DQO_DESC … #define GVE_COMPL_TYPE_DQO_MISS … #define GVE_COMPL_TYPE_DQO_REINJECTION … /* The most significant bit in the completion tag can change the completion * type from packet completion to miss path completion. */ #define GVE_ALT_MISS_COMPL_BIT … /* Descriptor to post buffers to HW on buffer queue. */ struct gve_rx_desc_dqo { … } __packed; static_assert(…); /* Descriptor for HW to notify SW of new packets received on RX queue. */ struct gve_rx_compl_desc_dqo { … } __packed; static_assert(…); /* Ringing the doorbell too often can hurt performance. * * HW requires this value to be at least 8. */ #define GVE_RX_BUF_THRESH_DQO … #endif /* _GVE_DESC_DQO_H_ */
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