ff3ced1270
requiried to keep consistent softc state before/after callback function invocation and supposed to be sligntly faster than previous one as it wouldn't incur callback overhead. With this change callback function was gone. - Decrease TI_MAXTXSEGS to 32 from 128. It seems that most mbuf chain length is less than 32 and it would be re-packed with m_defrag(9) if its chain length is larger than TI_MAXTXSEGS. This would protect ti(4) against possible kernel stack overflow when txsegs[] is put on stack. Alternatively, we can embed the txsegs[] into softc. However, that would waste memory and make Tx/Rx speration hard when we want to sperate Tx/Rx handlers to optimize locking. - Fix dma map tracking used in Tx path. Previously it used the dma map of the last mbuf chain in ti_txeof() which was incorrect as ti(4) used dma map of the first mbuf chain when it loads a mbuf chain with bus_dmamap_load_mbuf(9). Correct the bug by introducing queues that keep track of active/inactive dma maps/mbuf chain. - Use ti_txcnt to check whether driver need to set watchdog timer instead of blidnly clearing the timer in ti_txeof(). - Remove the 3rd arg. of ti_encap(). Since ti(4) now caches the last descriptor index(ti_tx_saved_prodidx) used in Tx there is no need to pass it as a fuction arg. - Change data type of producer/consumer index to int from u_int16_t in order to remove implicit type conversions in Tx/Rx handlers. - Check interface queue before getting a mbuf chain to reduce locking overhead. - Check number of available Tx descriptores to be 16 or higher in ti_start(). This wouldn't protect Tx descriptor shortage but it would reduce number of bus_dmamap_unload(9) calls in ti_encap() when we are about to running out of Tx descriptors. - Command NIC to send packets ony when the driver really has packets enqueued. Previously it always set TI_MB_SENDPROD_IDX which would command NIC to DMA Tx descriptors into NIC local memory regardless of Tx descriptor changes. Reviewed by: scottl
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html