Module Name: src
Committed By: msaitoh
Date: Mon Jan 29 06:05:11 UTC 2024
Modified Files:
src/sys/dev/pci: if_wm.c
Log Message:
wm(4): Drop frames if the RX descriptor ring has no room on multiqueue system.
Drop frames if the RX descriptor ring has no room. This is enabled only on
multiqueue system to avoid bad influence to other queues. The drop count
can be seen by the RQDPC counter (wmN rxqXXdrop evcnt).
To generate a diff of this commit:
cvs rdiff -u -r1.795 -r1.796 src/sys/dev/pci/if_wm.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/pci/if_wm.c
diff -u src/sys/dev/pci/if_wm.c:1.795 src/sys/dev/pci/if_wm.c:1.796
--- src/sys/dev/pci/if_wm.c:1.795 Mon Jan 29 05:02:06 2024
+++ src/sys/dev/pci/if_wm.c Mon Jan 29 06:05:11 2024
@@ -1,4 +1,4 @@
-/* $NetBSD: if_wm.c,v 1.795 2024/01/29 05:02:06 msaitoh Exp $ */
+/* $NetBSD: if_wm.c,v 1.796 2024/01/29 06:05:11 msaitoh Exp $ */
/*
* Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -82,7 +82,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.795 2024/01/29 05:02:06 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.796 2024/01/29 06:05:11 msaitoh Exp $");
#ifdef _KERNEL_OPT
#include "opt_if_wm.h"
@@ -8458,6 +8458,8 @@ wm_init_rx_regs(struct wm_softc *sc, str
rxq->rxq_descsize * rxq->rxq_ndesc);
if ((sc->sc_flags & WM_F_NEWQUEUE) != 0) {
+ uint32_t srrctl;
+
if (MCLBYTES & ((1 << SRRCTL_BSIZEPKT_SHIFT) - 1))
panic("%s: MCLBYTES %d unsupported for 82575 "
"or higher\n", __func__, MCLBYTES);
@@ -8466,9 +8468,17 @@ wm_init_rx_regs(struct wm_softc *sc, str
* Currently, support SRRCTL_DESCTYPE_ADV_ONEBUF
* only.
*/
- CSR_WRITE(sc, WMREG_SRRCTL(qid),
- SRRCTL_DESCTYPE_ADV_ONEBUF
- | (MCLBYTES >> SRRCTL_BSIZEPKT_SHIFT));
+ srrctl = SRRCTL_DESCTYPE_ADV_ONEBUF
+ | (MCLBYTES >> SRRCTL_BSIZEPKT_SHIFT);
+ /*
+ * Drop frames if the RX descriptor ring has no room.
+ * This is enabled only on multiqueue system to avoid
+ * bad influence to other queues.
+ */
+ if (sc->sc_nqueues > 1)
+ srrctl |= SRRCTL_DROP_EN;
+ CSR_WRITE(sc, WMREG_SRRCTL(qid), srrctl);
+
CSR_WRITE(sc, WMREG_RXDCTL(qid), RXDCTL_QUEUE_ENABLE
| RXDCTL_PTHRESH(16) | RXDCTL_HTHRESH(8)
| RXDCTL_WTHRESH(1));
