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cxgb4: Add FL DMA mapping error and low counter

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Add Free List DMA Mapping Errors to SGE Queue info for
Free Lists. Add Free List "Low" counter to count the number of times we
see the number of pointers that we _think_ the hardware sees in the
Free List below the Egress Threshold.

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hariprasad Shenai 2015-12-08 10:09:16 +05:30 committed by David S. Miller
parent 8d0557d27d
commit 70055dd064
3 changed files with 11 additions and 0 deletions
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2
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
View File

@ -483,6 +483,8 @@ struct sge_fl { /* SGE free-buffer queue state */
unsigned int pidx; /* producer index */
unsigned long alloc_failed; /* # of times buffer allocation failed */
unsigned long large_alloc_failed;
unsigned long mapping_err; /* # of RX Buffer DMA Mapping failures */
unsigned long low; /* # of times momentarily starving */
unsigned long starving;
/* RO fields */
unsigned int cntxt_id; /* SGE context id for the free list */

6
drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
View File

@ -2325,6 +2325,8 @@ do { \
TL("TxMapErr:", mapping_err);
RL("FLAllocErr:", fl.alloc_failed);
RL("FLLrgAlcErr:", fl.large_alloc_failed);
RL("FLMapErr:", fl.mapping_err);
RL("FLLow:", fl.low);
RL("FLStarving:", fl.starving);
} else if (iscsi_idx < iscsi_entries) {
@ -2359,6 +2361,8 @@ do { \
RL("RxNoMem:", stats.nomem);
RL("FLAllocErr:", fl.alloc_failed);
RL("FLLrgAlcErr:", fl.large_alloc_failed);
RL("FLMapErr:", fl.mapping_err);
RL("FLLow:", fl.low);
RL("FLStarving:", fl.starving);
} else if (rdma_idx < rdma_entries) {
@ -2388,6 +2392,8 @@ do { \
RL("RxNoMem:", stats.nomem);
RL("FLAllocErr:", fl.alloc_failed);
RL("FLLrgAlcErr:", fl.large_alloc_failed);
RL("FLMapErr:", fl.mapping_err);
RL("FLLow:", fl.low);
RL("FLStarving:", fl.starving);
} else if (ciq_idx < ciq_entries) {

3
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -613,6 +613,7 @@ static unsigned int refill_fl(struct adapter *adap, struct sge_fl *q, int n,
PCI_DMA_FROMDEVICE);
if (unlikely(dma_mapping_error(adap->pdev_dev, mapping))) {
__free_pages(pg, s->fl_pg_order);
q->mapping_err++;
goto out; /* do not try small pages for this error */
}
mapping |= RX_LARGE_PG_BUF;
@ -642,6 +643,7 @@ alloc_small_pages:
PCI_DMA_FROMDEVICE);
if (unlikely(dma_mapping_error(adap->pdev_dev, mapping))) {
put_page(pg);
q->mapping_err++;
goto out;
}
*d++ = cpu_to_be64(mapping);
@ -663,6 +665,7 @@ out: cred = q->avail - cred;
if (unlikely(fl_starving(adap, q))) {
smp_wmb();
q->low++;
set_bit(q->cntxt_id - adap->sge.egr_start,
adap->sge.starving_fl);
}