Author: sbruno Date: Sun Aug 16 19:06:23 2015 New Revision: 286829 URL: https://svnweb.freebsd.org/changeset/base/286829
Log: Add capability to disable CRC stripping. This breaks IPMI/BMC capabilities on certain adatpers. Linux has been doing the exact same thing since 2008 https://github.com/torvalds/linux/commit/eb7c3adb1ca92450870dbb0d347fc986cd5e2af4 PR: 161277 Differential Revision: https://reviews.freebsd.org/D3282 Submitted by: fravad...@gmail.com Reviewed by: erj wblock MFC after: 2 weeks Relnotes: yes Sponsored by: Limelight Networks Modified: head/share/man/man4/em.4 head/sys/dev/e1000/if_em.c Modified: head/share/man/man4/em.4 ============================================================================== --- head/share/man/man4/em.4 Sun Aug 16 17:07:53 2015 (r286828) +++ head/share/man/man4/em.4 Sun Aug 16 19:06:23 2015 (r286829) @@ -31,7 +31,7 @@ .\" .\" $FreeBSD$ .\" -.Dd October 11, 2011 +.Dd August 16, 2015 .Dt EM 4 .Os .Sh NAME @@ -205,6 +205,11 @@ Tunables can be set at the prompt before booting the kernel or stored in .Xr loader.conf 5 . .Bl -tag -width indent +.It Va hw.em.disable_crc_stripping +Disable or enable hardware stripping of CRC field. +This is mostly useful on BMC/IPMI shared interfaces where stripping the CRC +causes remote access over IPMI to fail. +Default 0 (enabled). .It Va hw.em.eee_setting Disable or enable Energy Efficient Ethernet. Default 1 (disabled). Modified: head/sys/dev/e1000/if_em.c ============================================================================== --- head/sys/dev/e1000/if_em.c Sun Aug 16 17:07:53 2015 (r286828) +++ head/sys/dev/e1000/if_em.c Sun Aug 16 19:06:23 2015 (r286829) @@ -366,6 +366,10 @@ MODULE_DEPEND(em, netmap, 1, 1, 1); static SYSCTL_NODE(_hw, OID_AUTO, em, CTLFLAG_RD, 0, "EM driver parameters"); +static int em_disable_crc_stripping = 0; +SYSCTL_INT(_hw_em, OID_AUTO, disable_crc_stripping, CTLFLAG_RDTUN, + &em_disable_crc_stripping, 0, "Disable CRC Stripping"); + static int em_tx_int_delay_dflt = EM_TICKS_TO_USECS(EM_TIDV); static int em_rx_int_delay_dflt = EM_TICKS_TO_USECS(EM_RDTR); SYSCTL_INT(_hw_em, OID_AUTO, tx_int_delay, CTLFLAG_RDTUN, &em_tx_int_delay_dflt, @@ -4514,7 +4518,8 @@ em_initialize_receive_unit(struct adapte (hw->mac.mc_filter_type << E1000_RCTL_MO_SHIFT); /* Strip the CRC */ - rctl |= E1000_RCTL_SECRC; + if (!em_disable_crc_stripping) + rctl |= E1000_RCTL_SECRC; /* Make sure VLAN Filters are off */ rctl &= ~E1000_RCTL_VFE; _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
