From 4d95847381228639844c7197deb8b2211274ef22 Mon Sep 17 00:00:00 2001 From: Matt Carlson Date: Wed, 20 Apr 2011 07:57:35 +0000 Subject: [PATCH] tg3: Workaround rx_discards stat bug The 5717, 5718, 5719 A0, and 5720 A0 has a bug where the rx_discards statistic counter will increment when dropping unwanted multicast frames. This patch works around the problem by attempting to recreate the data using other means. The resulting value will not be accurate, but it can still serve as a problem indicator. Signed-off-by: Matt Carlson Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/tg3.c | 27 ++++++++++++++++++++++++++- drivers/net/tg3.h | 2 ++ 2 files changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index 9915734ac3e9..58787ea8b7a4 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -339,6 +339,7 @@ static const struct { { "dma_write_prioq_full" }, { "rxbds_empty" }, { "rx_discards" }, + { "mbuf_lwm_thresh_hit" }, { "rx_errors" }, { "rx_threshold_hit" }, @@ -8207,6 +8208,10 @@ static int tg3_reset_hw(struct tg3 *tp, int reset_phy) val = BUFMGR_MODE_ENABLE | BUFMGR_MODE_ATTN_ENABLE; if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5719) val |= BUFMGR_MODE_NO_TX_UNDERRUN; + if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717 || + tp->pci_chip_rev_id == CHIPREV_ID_5719_A0 || + tp->pci_chip_rev_id == CHIPREV_ID_5720_A0) + val |= BUFMGR_MODE_MBLOW_ATTN_ENAB; tw32(BUFMGR_MODE, val); for (i = 0; i < 2000; i++) { if (tr32(BUFMGR_MODE) & BUFMGR_MODE_ENABLE) @@ -8870,7 +8875,19 @@ static void tg3_periodic_fetch_stats(struct tg3 *tp) TG3_STAT_ADD32(&sp->rx_undersize_packets, MAC_RX_STATS_UNDERSIZE); TG3_STAT_ADD32(&sp->rxbds_empty, RCVLPC_NO_RCV_BD_CNT); - TG3_STAT_ADD32(&sp->rx_discards, RCVLPC_IN_DISCARDS_CNT); + if (GET_ASIC_REV(tp->pci_chip_rev_id) != ASIC_REV_5717) { + TG3_STAT_ADD32(&sp->rx_discards, RCVLPC_IN_DISCARDS_CNT); + } else { + u32 val = tr32(HOSTCC_FLOW_ATTN); + val = (val & HOSTCC_FLOW_ATTN_MBUF_LWM) ? 1 : 0; + if (val) { + tw32(HOSTCC_FLOW_ATTN, HOSTCC_FLOW_ATTN_MBUF_LWM); + sp->rx_discards.low += val; + if (sp->rx_discards.low < val) + sp->rx_discards.high += 1; + } + sp->mbuf_lwm_thresh_hit = sp->rx_discards; + } TG3_STAT_ADD32(&sp->rx_errors, RCVLPC_IN_ERRORS_CNT); } @@ -13973,6 +13990,14 @@ static int __devinit tg3_get_invariants(struct tg3 *tp) GET_CHIP_REV(tp->pci_chip_rev_id) != CHIPREV_5700_BX) tp->coalesce_mode |= HOSTCC_MODE_32BYTE; + /* Set these bits to enable statistics workaround. */ + if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717 || + tp->pci_chip_rev_id == CHIPREV_ID_5719_A0 || + tp->pci_chip_rev_id == CHIPREV_ID_5720_A0) { + tp->coalesce_mode |= HOSTCC_MODE_ATTN; + tp->grc_mode |= GRC_MODE_IRQ_ON_FLOW_ATTN; + } + if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785 || GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_57780) tp->tg3_flags3 |= TG3_FLG3_USE_PHYLIB; diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h index 224c3e0ec695..db50bfe046e4 100644 --- a/drivers/net/tg3.h +++ b/drivers/net/tg3.h @@ -147,6 +147,7 @@ #define CHIPREV_ID_5717_A0 0x05717000 #define CHIPREV_ID_57765_A0 0x57785000 #define CHIPREV_ID_5719_A0 0x05719000 +#define CHIPREV_ID_5720_A0 0x05720000 #define GET_ASIC_REV(CHIP_REV_ID) ((CHIP_REV_ID) >> 12) #define ASIC_REV_5700 0x07 #define ASIC_REV_5701 0x00 @@ -2602,6 +2603,7 @@ struct tg3_hw_stats { tg3_stat64_t dma_write_prioq_full; tg3_stat64_t rxbds_empty; tg3_stat64_t rx_discards; + tg3_stat64_t mbuf_lwm_thresh_hit; tg3_stat64_t rx_errors; tg3_stat64_t rx_threshold_hit; -- 2.20.1