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ionic: minimize resources when under kdump

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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: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson 2021-07-27 10:43:25 -07:00 committed by David S. Miller
parent 7c57706b4b
commit c0b03e8399
1 changed files with 19 additions and 2 deletions
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21
drivers/net/ethernet/pensando/ionic/ionic_lif.c
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@ -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;
lif->ntxq_descs = IONIC_DEF_TXRX_DESC;
lif->nrxq_descs = IONIC_DEF_TXRX_DESC;
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) {