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net/sfc/base: more accurately calculate number of PS credits

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Maximum number of packets per 64k buffer should be rounded up
when calculating number of credits by event queue size.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
This commit is contained in:
Andrew Rybchenko 2017-11-16 08:04:12 +00:00 committed by Ferruh Yigit
parent c2b6023351
commit ede62b5a56
2 changed files with 4 additions and 1 deletions
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2
drivers/net/sfc/base/ef10_ev.c
View File

@ -1370,7 +1370,7 @@ ef10_ev_rxlabel_init(
eersp->eers_rx_packed_stream = packed_stream;
if (packed_stream) {
eersp->eers_rx_packed_stream_credits = (eep->ee_mask + 1) /
(EFX_RX_PACKED_STREAM_MEM_PER_CREDIT /
EFX_DIV_ROUND_UP(EFX_RX_PACKED_STREAM_MEM_PER_CREDIT,
EFX_RX_PACKED_STREAM_MIN_PACKET_SPACE);
EFSYS_ASSERT3U(eersp->eers_rx_packed_stream_credits, !=, 0);
/*

3
drivers/net/sfc/base/efx.h
View File

@ -48,6 +48,9 @@ extern "C" {
#define EFX_FIELD_OFFSET(_type, _field) \
((size_t) &(((_type *)0)->_field))
/* The macro expands divider twice */
#define EFX_DIV_ROUND_UP(_n, _d) (((_n) + (_d) - 1) / (_d))
/* Return codes */
typedef __success(return == 0) int efx_rc_t;