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tg3: Add read dma workaround for 5720

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Commit 091f0ea300 "tg3: Add New 5719 Read
DMA workaround" added a workaround for TX DMA stall on the 5719. This
workaround needs to be applied to the 5720 as well.

Cc: stable@vger.kernel.org
Reported-by: Roland Dreier <roland@purestorage.com>
Tested-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nithin Sujir 2013-06-03 09:19:34 +00:00 committed by David S. Miller
parent 3a5395b3d5
commit 9bc297ea06
2 changed files with 18 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
drivers/net/ethernet/broadcom/tg3.c
View file

@ -9468,6 +9468,14 @@ static void tg3_rss_write_indir_tbl(struct tg3 *tp)
}
}
static inline u32 tg3_lso_rd_dma_workaround_bit(struct tg3 *tp)
{
if (tg3_asic_rev(tp) == ASIC_REV_5719)
return TG3_LSO_RD_DMA_TX_LENGTH_WA_5719;
else
return TG3_LSO_RD_DMA_TX_LENGTH_WA_5720;
}
/* tp->lock is held. */
static int tg3_reset_hw(struct tg3 *tp, bool reset_phy)
{
@ -10153,16 +10161,17 @@ static int tg3_reset_hw(struct tg3 *tp, bool reset_phy)
tw32_f(RDMAC_MODE, rdmac_mode);
udelay(40);
if (tg3_asic_rev(tp) == ASIC_REV_5719) {
if (tg3_asic_rev(tp) == ASIC_REV_5719 ||
tg3_asic_rev(tp) == ASIC_REV_5720) {
for (i = 0; i < TG3_NUM_RDMA_CHANNELS; i++) {
if (tr32(TG3_RDMA_LENGTH + (i << 2)) > TG3_MAX_MTU(tp))
break;
}
if (i < TG3_NUM_RDMA_CHANNELS) {
val = tr32(TG3_LSO_RD_DMA_CRPTEN_CTRL);
val |= TG3_LSO_RD_DMA_TX_LENGTH_WA;
val |= tg3_lso_rd_dma_workaround_bit(tp);
tw32(TG3_LSO_RD_DMA_CRPTEN_CTRL, val);
tg3_flag_set(tp, 5719_RDMA_BUG);
tg3_flag_set(tp, 5719_5720_RDMA_BUG);
}
}
@ -10526,15 +10535,15 @@ static void tg3_periodic_fetch_stats(struct tg3 *tp)
TG3_STAT_ADD32(&sp->tx_ucast_packets, MAC_TX_STATS_UCAST);
TG3_STAT_ADD32(&sp->tx_mcast_packets, MAC_TX_STATS_MCAST);
TG3_STAT_ADD32(&sp->tx_bcast_packets, MAC_TX_STATS_BCAST);
if (unlikely(tg3_flag(tp, 5719_RDMA_BUG) &&
if (unlikely(tg3_flag(tp, 5719_5720_RDMA_BUG) &&
(sp->tx_ucast_packets.low + sp->tx_mcast_packets.low +
sp->tx_bcast_packets.low) > TG3_NUM_RDMA_CHANNELS)) {
u32 val;
val = tr32(TG3_LSO_RD_DMA_CRPTEN_CTRL);
val &= ~TG3_LSO_RD_DMA_TX_LENGTH_WA;
val &= ~tg3_lso_rd_dma_workaround_bit(tp);
tw32(TG3_LSO_RD_DMA_CRPTEN_CTRL, val);
tg3_flag_clear(tp, 5719_RDMA_BUG);
tg3_flag_clear(tp, 5719_5720_RDMA_BUG);
}
TG3_STAT_ADD32(&sp->rx_octets, MAC_RX_STATS_OCTETS);

5
drivers/net/ethernet/broadcom/tg3.h
View file

@ -1422,7 +1422,8 @@
#define TG3_LSO_RD_DMA_CRPTEN_CTRL 0x00004910
#define TG3_LSO_RD_DMA_CRPTEN_CTRL_BLEN_BD_4K 0x00030000
#define TG3_LSO_RD_DMA_CRPTEN_CTRL_BLEN_LSO_4K 0x000c0000
#define TG3_LSO_RD_DMA_TX_LENGTH_WA 0x02000000
#define TG3_LSO_RD_DMA_TX_LENGTH_WA_5719 0x02000000
#define TG3_LSO_RD_DMA_TX_LENGTH_WA_5720 0x00200000
/* 0x4914 --> 0x4be0 unused */
#define TG3_NUM_RDMA_CHANNELS 4
@ -3059,7 +3060,7 @@ enum TG3_FLAGS {
TG3_FLAG_APE_HAS_NCSI,
TG3_FLAG_TX_TSTAMP_EN,
TG3_FLAG_4K_FIFO_LIMIT,
TG3_FLAG_5719_RDMA_BUG,
TG3_FLAG_5719_5720_RDMA_BUG,
TG3_FLAG_RESET_TASK_PENDING,
TG3_FLAG_PTP_CAPABLE,
TG3_FLAG_5705_PLUS,