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iflib: Add a new quirk

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ENETC NIC found in LS1028A has a bug where clearing TX pidx/cidx
causes the ring to hang after being re-enabled.
Add a new flag, if set iflib will preserve the indices during restart.

Submitted by: Kornel Duleba <mindal@semihalf.com>
Reviewed by: gallatin, erj
Obtained from: Semihalf
Sponsored by: Alstom Group
Differential Revision: https://reviews.freebsd.org/D30728
This commit is contained in:
Marcin Wojtas 2021-05-19 11:09:16 +02:00
parent 3eae4e106a
commit 58632fa7a3
2 changed files with 10 additions and 1 deletions
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7
sys/net/iflib.c
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@ -2604,7 +2604,12 @@ iflib_stop(if_ctx_t ctx)
iflib_txsd_free(ctx, txq, j);
}
txq->ift_processed = txq->ift_cleaned = txq->ift_cidx_processed = 0;
txq->ift_in_use = txq->ift_gen = txq->ift_cidx = txq->ift_pidx = txq->ift_no_desc_avail = 0;
txq->ift_in_use = txq->ift_gen = txq->ift_no_desc_avail = 0;
if (sctx->isc_flags & IFLIB_PRESERVE_TX_INDICES)
txq->ift_cidx = txq->ift_pidx;
else
txq->ift_cidx = txq->ift_pidx = 0;
txq->ift_closed = txq->ift_mbuf_defrag = txq->ift_mbuf_defrag_failed = 0;
txq->ift_no_tx_dma_setup = txq->ift_txd_encap_efbig = txq->ift_map_failed = 0;
txq->ift_pullups = 0;

4
sys/net/iflib.h
View file

@ -402,6 +402,10 @@ typedef enum {
* Interface has an admin completion queue
*/
#define IFLIB_HAS_ADMINCQ 0x100000
/*
* Interface needs to preserve TX ring indices across restarts.
*/
#define IFLIB_PRESERVE_TX_INDICES 0x200000
/*
* These enum values are used in iflib_needs_restart to indicate to iflib