The branch stable/14 has been updated by kbowling: URL: https://cgit.FreeBSD.org/src/commit/?id=98b95af873acf4beeb4ac9a0c83e5d009fb78cd9
commit 98b95af873acf4beeb4ac9a0c83e5d009fb78cd9 Author: Kevin Bowling <[email protected]> AuthorDate: 2026-08-08 12:26:23 +0000 Commit: Kevin Bowling <[email protected]> CommitDate: 2026-08-22 00:49:40 +0000 e1000: Correct Rx descriptor threshold programming Jumbo receive tuning on integrated controllers enabled PTHRESH without a nonzero HTHRESH, contrary to the hardware programming requirements. It also covered only the integrated MAC generations present when the workaround was added. Enumerate every jumbo-capable ICH and PCH type and program PTHRESH=3 with HTHRESH=1. Linux fixed the same HTHRESH omission in b701cacdbcfb. The 82574 path combined threshold values with the reset values using bitwise OR. Requesting WTHRESH=4 while the reset value was one thus programmed five. Clear the complete threshold fields before installing the established PTHRESH=32, HTHRESH=4, WTHRESH=4 descriptor-granularity policy. (cherry picked from commit abe22383f1b144f0868aa0654ec4514d36f7a4f5) --- sys/dev/e1000/if_em.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c index a35e14e20c1f..5603d63e480b 100644 --- a/sys/dev/e1000/if_em.c +++ b/sys/dev/e1000/if_em.c @@ -3920,6 +3920,27 @@ em_integrated_jumbo_rx(struct e1000_hw *hw) } } +static bool +em_integrated_jumbo_rx(struct e1000_hw *hw) +{ + switch (hw->mac.type) { + case e1000_ich9lan: + case e1000_ich10lan: + case e1000_pchlan: + case e1000_pch2lan: + case e1000_pch_lpt: + case e1000_pch_spt: + case e1000_pch_cnp: + case e1000_pch_tgp: + case e1000_pch_adp: + case e1000_pch_mtp: + case e1000_pch_ptp: + return (true); + default: + return (false); + } +} + static void em_initialize_receive_unit(if_ctx_t ctx) {
