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Necto
Asked: 2017-03-02 03:12:07 +0800 CST

PCI addresses of 2 network ports differ only in "device function" field => they belong to the same NIC?

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I have multiple 10G ethernet ports on my server. Here is lspci for some of them:

81:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
81:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
83:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
83:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
85:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
85:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

Let's take e.g. 81:00.0 and 81:00.1. Their bus-id and device-id match.

Does this mean, they are the ports of the same NIC, i.e. share the same ethernet controller?

ethernet nic architecture pci lspci

1 Answers

  1. 82599ES datasheet(p. 64) states:

    PCIe device numbers identify logical devices within the physical device (the 82599 is a physical device). The 82599 implements a single logical device with two separate PCI Functions: LAN 0 and LAN 1. The device number is captured from each type 0 configuration write transaction.

    So at least in this case, 81:00.0 and 81:00.1 are 2 ports of the same NIC.

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