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- Dpdk-dev V3 04/18 Net/axgbe: Add Structures For Macbook Pro
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Dpdk-dev V3 04/18 Net/axgbe: Add Structures For Macbook Pro
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[PATCH v3 00/11] Add driver for VSC9953 Ethernet Switch. This patches add support for VSC9953, a Vitesse L2 Switch IP which is integrated in the T1040/T1020 Freescale SoCs.
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July 5, 2018, 4:29 p.m. From: Mark Kavanagh There are numerous factors that must be considered when calculating the size of an mbuf: - the data portion of the mbuf must be sized in accordance With Rx buffer alignment (typically 1024B). So, for example, in order to successfully receive and capture a 1500B packet, mbufs with a data portion of size 2048B must be used.
in OvS, the elements that comprise an mbuf are:. the dp packet, which includes a struct rte mbuf (704B). RTEPKTMBUFHEADROOM (128B). packet data (aligned to 1k, as previously described).
RTEPKTMBUFTAILROOM (typically 0) Some PMDs require that the total mbuf size (i.e. The total sum of all of the above-listed components' lengths) is cache-aligned. To satisfy this requirement, it may be necessary to round up the total mbuf size with respect to cacheline size. In doing so, it's possible that the dppacket's data portion is inadvertently increased in size, such that it no longer adheres to Rx buffer alignment. Consequently, the following property of the mbuf no longer holds true: mbuf.datalen mbuf.buflen - mbuf.dataoff This creates a problem in the case of multi-segment mbufs, where that assumption is assumed to be true for all but the final segment in an mbuf chain. Resolve this issue by adjusting the size of the mbuf's private data portion, as opposed to the packet data portion when aligning mbuf size to cachelines.
Dpdk-dev V3 04/18 Net/axgbe: Add Structures For Mac Free
Fixes: 4be4d22 ('netdev-dpdk: clean up mbuf initialization') Fixes: 31b88c9 ('netdev-dpdk: round up mbufsize to cachelinesize') CC: Santosh Shukla Signed-off-by: Mark Kavanagh Acked-by: Santosh Shukla Acked-by: Eelco Chaudron - lib/netdev-dpdk.c 53 - 1 file changed, 35 insertions(+), 18 deletions(-) Patch.