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ibmvnic: Allow multiple ltbs in txpool ltb_set

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Allow multiple LTBs in the txpool's ltb_set. i.e rather than using
a single large LTB, use several smaller LTBs.

The first n-1 LTBs will all be of the same size. The size of the last
LTB in the set depends on the number of buffers and buffer (mtu) size.
This strategy hopefully allows more reuse of the initial LTBs and also
reduces the chances of an allocation failure (of the large LTB) when
system is low in memory.

Suggested-by: Brian King <brking@linux.ibm.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Signed-off-by: Dany Madden <drt@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sukadev Bhattiprolu
2022-04-13 13:10:26 -04:00
committed by Jakub Kicinski
parent a75de82057
commit 93b1ebb348
2 changed files with 35 additions and 20 deletions
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2
drivers/net/ethernet/ibm/ibmvnic.h
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@@ -856,7 +856,7 @@ struct ibmvnic_tx_pool {
int *free_map;
int consumer_index;
int producer_index;
struct ibmvnic_long_term_buff long_term_buff;
struct ibmvnic_ltb_set ltb_set;
int num_buffers;
int buf_size;
} ____cacheline_aligned;