Commit c0b03e83 authored by Shannon Nelson's avatar Shannon Nelson Committed by David S. Miller
Browse files

ionic: minimize resources when under kdump 



When running in a small kdump kernel, we can play nice and
minimize our resource use to help make sure that kdump is
successful in its mission.

Signed-off-by: default avatarShannon Nelson <snelson@pensando.io>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c57706b

drivers/net/ethernet/pensando/ionic/ionic_lif.c

+19 −2
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <linux/interrupt.h>

#include <linux/pci.h>

#include <linux/cpumask.h>

#include <linux/crash_dump.h>



#include "ionic.h"

#include "ionic_bus.h"
@@ -2834,8 +2835,14 @@ int ionic_lif_alloc(struct ionic *ionic) 


	lif->ionic = ionic;

	lif->index = 0;



	if (is_kdump_kernel()) {

		lif->ntxq_descs = IONIC_MIN_TXRX_DESC;

		lif->nrxq_descs = IONIC_MIN_TXRX_DESC;

	} else {

		lif->ntxq_descs = IONIC_DEF_TXRX_DESC;

		lif->nrxq_descs = IONIC_DEF_TXRX_DESC;

	}



	/* Convert the default coalesce value to actual hw resolution */

	lif->rx_coalesce_usecs = IONIC_ITR_COAL_USEC_DEFAULT;
@@ -3519,6 +3526,7 @@ int ionic_lif_size(struct ionic *ionic) 
	unsigned int min_intrs;

	int err;



	/* retrieve basic values from FW */

	lc = &ident->lif.eth.config;

	dev_nintrs = le32_to_cpu(ident->dev.nintrs);

	neqs_per_lif = le32_to_cpu(ident->lif.rdma.eq_qtype.qid_count);
@@ -3526,6 +3534,15 @@ int ionic_lif_size(struct ionic *ionic) 
	ntxqs_per_lif = le32_to_cpu(lc->queue_count[IONIC_QTYPE_TXQ]);

	nrxqs_per_lif = le32_to_cpu(lc->queue_count[IONIC_QTYPE_RXQ]);



	/* limit values to play nice with kdump */

	if (is_kdump_kernel()) {

		dev_nintrs = 2;

		neqs_per_lif = 0;

		nnqs_per_lif = 0;

		ntxqs_per_lif = 1;

		nrxqs_per_lif = 1;

	}



	/* reserve last queue id for hardware timestamping */

	if (lc->features & cpu_to_le64(IONIC_ETH_HW_TIMESTAMP)) {

		if (ntxqs_per_lif <= 1 || nrxqs_per_lif <= 1) {