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| /freebsd-11-stable/sys/dev/ti/ | ||
| H A D | if_ti.c | diff 153982 Tue Jan 03 04:14:07 MST 2006 yongari - Tx side bus_dmamap_load_mbuf_sg(9) support. This reduces bookkeeping 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 |
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