Date: Mon, 14 Dec 2015 09:46:46 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r292185 - stable/10/sys/dev/usb/net Message-ID: <201512140946.tBE9kk6X019054@repo.freebsd.org>
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Author: hselasky Date: Mon Dec 14 09:46:46 2015 New Revision: 292185 URL: https://svnweb.freebsd.org/changeset/base/292185 Log: MFC r291953: When setting up VLANs on a Raspberry Pi ethernet port, the MTU drops from 1500 to 1496 bytes. The MTU should remain at 1500, extending the frame size as per IEEE 802.3. Adding IFCAP_VLAN_MTU to the if_capabilities field in the smsc driver solves the problem. The datasheet for the LAN9512 chip, section 3.2.3 states that the chip supports the extended frame. Submitted by: rpp@ci.com.au PR: 205050 Modified: stable/10/sys/dev/usb/net/if_smsc.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/usb/net/if_smsc.c ============================================================================== --- stable/10/sys/dev/usb/net/if_smsc.c Mon Dec 14 09:42:39 2015 (r292184) +++ stable/10/sys/dev/usb/net/if_smsc.c Mon Dec 14 09:46:46 2015 (r292185) @@ -1686,7 +1686,7 @@ smsc_attach_post_sub(struct usb_ether *u /* The chip supports TCP/UDP checksum offloading on TX and RX paths, however * currently only RX checksum is supported in the driver (see top of file). */ - ifp->if_capabilities |= IFCAP_RXCSUM; + ifp->if_capabilities |= IFCAP_RXCSUM | IFCAP_VLAN_MTU; ifp->if_hwassist = 0; /* TX checksuming is disabled (for now?)
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