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sfc: The size of the RX recycle ring should be more flexible

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Ideally the size would depend on the link speed, but the recycle
ring is created when the interface is brought up before the driver
knows the link speed. So size it for the maximum speed of a given NIC.
PowerPC is only supported on SFN7xxx and SFN8xxx NICs.

With this patch on a 40G NIC the number of calls to alloc_pages and
friends went down from about 18% to under 2%.
On a 10G NIC the number of calls to alloc_pages and friends went down
from about 15% to 0 (perf did not capture any calls during the 60
second test).
On a 100G NIC the number of calls to alloc_pages and friends went down
from about 23% to 4%.

Reported-by: Íñigo Huguet <ihuguet@redhat.com>
Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Link: https://lore.kernel.org/r/20220131111054.cp4f6foyinaarwbn@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Martin Habets
2022-01-31 11:10:54 +00:00
committed by Jakub Kicinski
parent 68650b4e6c
commit 000fe940e5
7 changed files with 57 additions and 17 deletions
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5
drivers/net/ethernet/sfc/nic_common.h
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@@ -195,6 +195,11 @@ static inline void efx_sensor_event(struct efx_nic *efx, efx_qword_t *ev)
efx->type->sensor_event(efx, ev);
}
static inline unsigned int efx_rx_recycle_ring_size(const struct efx_nic *efx)
{
return efx->type->rx_recycle_ring_size(efx);
}
/* Some statistics are computed as A - B where A and B each increase
* linearly with some hardware counter(s) and the counters are read
* asynchronously. If the counters contributing to B are always read