Hans Petter Selasky c40fbda341 MFC r322248: ... Fix for mlx4en(4) to properly call m_defrag(). The m_defrag() function can only defrag mbuf chains which have a valid mbuf packet header. In r291699 when the mlx4en(4) driver was converted into using BUSDMA(9), the call to m_defrag() was moved after the part of the transmit routine which strips the header from the mbuf chain. This effectivly disabled the mbuf defrag mechanism and such packets simply got dropped. This patch removes the stripping of mbufs from a chain and loads all mbufs using busdma. If busdma finds there are no segments, unload the DMA map and free the mbuf right away, because that means all data in the mbuf has been inlined in the TX ring. Else proceed as usual. Add a per-ring rounter for the number of defrag attempts and make sure the oversized_packets counter gets zeroed while at it. The counters are per-ring to avoid excessive cache misses in the TX path. Approved by: re (kib) Submitted by: mjoras@ Differential Revision: https://reviews.freebsd.org/D11683 Sponsored by: Mellanox Technologies		2017-08-15 09:21:46 +00:00
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drivers	MFC r322248:	2017-08-15 09:21:46 +00:00
include	MFC r314878:	2017-08-14 12:59:14 +00:00