Alexander Motin 9dc7c250b8 cxgb(4): Remove assumption of physically contiguous mbufs. ... Investigation of iSCSI target data corruption reports brought me to discovery that cxgb(4) expects mbufs to be physically contiguous, that is not true after I've started using m_extaddref() in software iSCSI for large zero-copy transmissions. In case of fragmented memory the driver transmitted garbage from pages following the first one due to simple use of pmap_kextract() for the first pointer instead of proper bus_dmamap_load_mbuf_sg(). Seems like it was done as some optimization many years ago, and at very least it is wrong in a world of IOMMUs. This patch just removes that optimization, plus limits packet coalescing for mbufs crossing page boundary, also depending on assumption of one segment per packet. MFC after: 3 days Sponsored by: iXsystems, Inc. Reviewed by: mmacy, np Differential revision: https://reviews.freebsd.org/D28428		2021-01-31 12:55:06 -05:00
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mvec.h
uipc_mvec.c