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Date: Wed, 13 Apr 2022 13:10:20 -0400 From: Dany Madden <drt@...ux.ibm.com> To: netdev@...r.kernel.org Cc: sukadev@...ux.ibm.com Subject: [PATCH net-next 0/6] ibmvnic: Use a set of LTBs per pool From: Sukadev Bhattiprolu <sukadev@...ux.ibm.com> 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. Sukadev Bhattiprolu (6): ibmvnic: rename local variable index to bufidx ibmvnic: define map_rxpool_buf_to_ltb() ibmvnic: define map_txpool_buf_to_ltb() ibmvnic: convert rxpool ltb to a set of ltbs ibmvnic: Allow multiple ltbs in rxpool ltb_set ibmvnic: Allow multiple ltbs in txpool ltb_set drivers/net/ethernet/ibm/ibmvnic.c | 310 ++++++++++++++++++++++++----- drivers/net/ethernet/ibm/ibmvnic.h | 54 ++++- 2 files changed, 308 insertions(+), 56 deletions(-) -- 2.27.0
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