Date: Tue, 1 Dec 2015 06:23:15 +0000 (UTC) From: Andrew Rybchenko <arybchik@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r291569 - head/sys/dev/sfxge Message-ID: <201512010623.tB16NFWr029421@repo.freebsd.org>
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Author: arybchik Date: Tue Dec 1 06:23:15 2015 New Revision: 291569 URL: https://svnweb.freebsd.org/changeset/base/291569 Log: sfxge: avoid TSO packets collapses if packet header uses 2 segments It is really observed in the case of VLAN over sfxge interface. Also this change makes total value equal to 35 which is default assumed by the kernel for if_hw_tsomaxsegcount. Sponsored by: Solarflare Communications, Inc. MFC after: 2 days Differential Revision: https://reviews.freebsd.org/D4319 Modified: head/sys/dev/sfxge/sfxge_tx.h Modified: head/sys/dev/sfxge/sfxge_tx.h ============================================================================== --- head/sys/dev/sfxge/sfxge_tx.h Tue Dec 1 06:22:27 2015 (r291568) +++ head/sys/dev/sfxge/sfxge_tx.h Tue Dec 1 06:23:15 2015 (r291569) @@ -53,11 +53,13 @@ * TSO, the mbuf length may be just over 64K, divided into 2K mbuf * clusters taking into account that the first may be not 2K cluster * boundary aligned. + * Packet header may be split into two segments because of, for example, + * VLAN header insertion. * The chain could be longer than this initially, but can be shortened * with m_collapse(). */ #define SFXGE_TX_MAPPING_MAX_SEG \ - (1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1) + (2 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1) /* * Buffer mapping flags.
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