General input/output architecture, protocol and related methods to implement flow control
First Claim
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1. An apparatus comprising:
- a storage device to;
maintain, for each of a plurality of virtual channels, a count of flow control credits to be granted to a device in association with transactions over the respective virtual channel, wherein the plurality of virtual channels are to be implemented on at least one data link, and each virtual channel corresponds to a respective one of a plurality of traffic types; and
link layer control logic to;
communicate, to the device, immediately following a reset of the data link, an indication of an amount of flow control credits for the device in association with the reset of the data link.
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Abstract
A storage device is provided to maintain a count of flow control credits to be granted to a device in association with transactions over a channel to be implemented on a data link and control logic is provided to communicate, to the device, an indication of an amount of flow control credits for the device in association with a reset of the data link.
187 Citations
24 Claims
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1. An apparatus comprising:
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a storage device to; maintain, for each of a plurality of virtual channels, a count of flow control credits to be granted to a device in association with transactions over the respective virtual channel, wherein the plurality of virtual channels are to be implemented on at least one data link, and each virtual channel corresponds to a respective one of a plurality of traffic types; and link layer control logic to; communicate, to the device, immediately following a reset of the data link, an indication of an amount of flow control credits for the device in association with the reset of the data link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a storage medium to maintain, for each of a plurality of virtual channels on a data link, a count of flow control credits to be granted to a device in association with transactions over the corresponding virtual channel; and link layer flow control logic to send to the device, over the data link and immediately after reset of the data link, an indication of an amount of flow control credits for the device in association with the reset of the data link, wherein the amount of flow control credits corresponds to a particular one of the plurality of virtual channels, each virtual channel corresponds to a respective one of a plurality of traffic types, at least one of the plurality of traffic types corresponds to request traffic and at least one other of the plurality of traffic types corresponds to response traffic.
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16. A method comprising:
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maintaining, using data link layer logic implemented at least in part in hardware circuitry, for each of a plurality of virtual channels, a count of flow control credits to be granted to a device in association with transactions over the respective virtual channel, wherein the plurality of virtual channels are to be implemented on a data link of a coherent interconnect, and each one of the plurality of virtual channels corresponds to a respective one of a plurality of traffic types; and sending, using the data link layer logic, to the device, over the data link and immediately following a reset of the data link, an indication of an amount of flow control credits for the device in association with the reset of the data link. - View Dependent Claims (17, 18, 19)
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20. A system comprising:
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a coherent interconnect; a first device; and a second device communicatively coupled to the first device using the interconnect, the second device including link layer flow control logic to; maintain, for each of a plurality of virtual channels, a count of flow control credits to be granted to a device in association with transactions over the respective virtual channel, wherein the plurality of virtual channels are to be implemented on a data link; and communicate to the device, over the data link and immediately following a reset of the data link, an indication of an amount of flow control credits for the device in association with the reset of the data link. - View Dependent Claims (21, 22)
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23. A system comprising:
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a particular device; and a receiving device communicatively coupled to the transmitting device using a data link of a coherent interconnect, wherein the receiving device comprises link layer logic to transmit credits to the particular device over the data link immediately following and in response to a reset of the data link, wherein the coherent interconnect is to implement an end-to-end protocol layer flow control mechanism with a retry mechanism, the credits correspond to a plurality of virtual channels, and each virtual channel corresponds to a respective one of a plurality of traffic types. - View Dependent Claims (24)
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Specification