[DragonFlyBSD - Submit #2332] Add MSI support to re(4)

[Tim Bisson via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>]

Issue #2332 has been reported by Tim Bisson.

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Submit #2332: Add MSI support to re(4)
http://bugs.dragonflybsd.org/issues/2332

Author: Tim Bisson
Status: New
Priority: Normal
Assignee: 
Category: 
Target version: 


This patch enables the re(4) driver to use MSI if the driver supports it. 

I have an ASUS M4A87TD motherboard with an integrated RealTek 8168E LAN adapter that supports MSI which I used it for testing. 

I used Sephe's bce(4) MSI work as a reference.

Here's the pciconf output with MSI support on:
re0@pci0:1:0:0: class=0x020000 card=0x84321043 chip=0x816810ec rev=0x06 hdr=0x00
   cap 01[40] = powerspec 3  supports D0 D1 D2 D3  current D0
   cap 05[50] = MSI supports 1 message, 64 bit enabled with 1 message
   cap 10[70] = PCI-Express 2 endpoint
   cap 11[b0] = MSI-X supports 4 messages in map 0x20
   cap 03[d0] = VPD

Here's pciconf output with MSI support turned off:
re0@pci0:1:0:0: class=0x020000 card=0x84321043 chip=0x816810ec rev=0x06 hdr=0x00
   cap 01[40] = powerspec 3  supports D0 D1 D2 D3  current D0
   cap 05[50] = MSI supports 1 message, 64 bit 
   cap 10[70] = PCI-Express 2 endpoint
   cap 11[b0] = MSI-X supports 4 messages in map 0x20
   cap 03[d0] = VPD


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