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Sukadev Bhattiprolu says: ==================== ibmvnic: Use a set of LTBs per pool ibmvnic uses a single large long term buffer (LTB) per rx or tx pool (queue). This has two limitations. First, if we need to free/allocate an LTB (eg during a reset), under low memory conditions, the allocation can fail. Second, the kernel limits the size of single LTB (DMA buffer) to 16MB (based on MAX_ORDER). With jumbo frames (mtu = 9000) we can only have about 1763 buffers per LTB (16MB / 9588 bytes per frame) even though the max supported buffers is 4096. (The 9588 instead of 9088 comes from IBMVNIC_BUFFER_HLEN.) To overcome these limitations, allow creating a set of LTBs per queue. ==================== Link: https://lore.kernel.org/r/20220413171026.1264294-1-drt@linux.ibm.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
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