aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMichael Chan <mchan@broadcom.com>2008-11-12 16:02:20 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-12 16:02:20 -0800
commitd8026d939495c105cf747c0196a8fa738cf2ad20 (patch)
tree9240f3af1002c84bfdedbc4c952234684eef3a92
parent5ec6d7bf195c2e70003ff30e4f51390ef7e85a31 (diff)
downloadlinux-2.6.38-lt-ux500-d8026d939495c105cf747c0196a8fa738cf2ad20.tar.gz
bnx2: Set rx buffer water marks based on MTU.
The default rx buffer water marks for XOFF/XON are for 1500 MTU. At larger MTUs, these water marks need to be adjusted for effective flow control. Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Benjamin Li <benli@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/bnx2.c12
-rw-r--r--drivers/net/bnx2.h21
2 files changed, 31 insertions, 2 deletions
diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index d28cbce0ec4..a52ffdc3b40 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -4473,7 +4473,7 @@ bnx2_reset_chip(struct bnx2 *bp, u32 reset_code)
static int
bnx2_init_chip(struct bnx2 *bp)
{
- u32 val;
+ u32 val, mtu;
int rc, i;
/* Make sure the interrupt is not active. */
@@ -4565,11 +4565,19 @@ bnx2_init_chip(struct bnx2 *bp)
REG_WR(bp, BNX2_EMAC_BACKOFF_SEED, val);
/* Program the MTU. Also include 4 bytes for CRC32. */
- val = bp->dev->mtu + ETH_HLEN + 4;
+ mtu = bp->dev->mtu;
+ val = mtu + ETH_HLEN + ETH_FCS_LEN;
if (val > (MAX_ETHERNET_PACKET_SIZE + 4))
val |= BNX2_EMAC_RX_MTU_SIZE_JUMBO_ENA;
REG_WR(bp, BNX2_EMAC_RX_MTU_SIZE, val);
+ if (mtu < 1500)
+ mtu = 1500;
+
+ bnx2_reg_wr_ind(bp, BNX2_RBUF_CONFIG, BNX2_RBUF_CONFIG_VAL(mtu));
+ bnx2_reg_wr_ind(bp, BNX2_RBUF_CONFIG2, BNX2_RBUF_CONFIG2_VAL(mtu));
+ bnx2_reg_wr_ind(bp, BNX2_RBUF_CONFIG3, BNX2_RBUF_CONFIG3_VAL(mtu));
+
for (i = 0; i < BNX2_MAX_MSIX_VEC; i++)
bp->bnx2_napi[i].last_status_idx = 0;
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index 617d9534016..2b9649ae630 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -4199,7 +4199,14 @@ struct l2_fhdr {
#define BNX2_RBUF_CONFIG 0x0020000c
#define BNX2_RBUF_CONFIG_XOFF_TRIP (0x3ffL<<0)
+#define BNX2_RBUF_CONFIG_XOFF_TRIP_VAL(mtu) \
+ ((((mtu) - 1500) * 31 / 1000) + 54)
#define BNX2_RBUF_CONFIG_XON_TRIP (0x3ffL<<16)
+#define BNX2_RBUF_CONFIG_XON_TRIP_VAL(mtu) \
+ ((((mtu) - 1500) * 39 / 1000) + 66)
+#define BNX2_RBUF_CONFIG_VAL(mtu) \
+ (BNX2_RBUF_CONFIG_XOFF_TRIP_VAL(mtu) | \
+ (BNX2_RBUF_CONFIG_XON_TRIP_VAL(mtu) << 16))
#define BNX2_RBUF_FW_BUF_ALLOC 0x00200010
#define BNX2_RBUF_FW_BUF_ALLOC_VALUE (0x1ffL<<7)
@@ -4221,11 +4228,25 @@ struct l2_fhdr {
#define BNX2_RBUF_CONFIG2 0x0020001c
#define BNX2_RBUF_CONFIG2_MAC_DROP_TRIP (0x3ffL<<0)
+#define BNX2_RBUF_CONFIG2_MAC_DROP_TRIP_VAL(mtu) \
+ ((((mtu) - 1500) * 4 / 1000) + 5)
#define BNX2_RBUF_CONFIG2_MAC_KEEP_TRIP (0x3ffL<<16)
+#define BNX2_RBUF_CONFIG2_MAC_KEEP_TRIP_VAL(mtu) \
+ ((((mtu) - 1500) * 2 / 100) + 30)
+#define BNX2_RBUF_CONFIG2_VAL(mtu) \
+ (BNX2_RBUF_CONFIG2_MAC_DROP_TRIP_VAL(mtu) | \
+ (BNX2_RBUF_CONFIG2_MAC_KEEP_TRIP_VAL(mtu) << 16))
#define BNX2_RBUF_CONFIG3 0x00200020
#define BNX2_RBUF_CONFIG3_CU_DROP_TRIP (0x3ffL<<0)
+#define BNX2_RBUF_CONFIG3_CU_DROP_TRIP_VAL(mtu) \
+ ((((mtu) - 1500) * 12 / 1000) + 18)
#define BNX2_RBUF_CONFIG3_CU_KEEP_TRIP (0x3ffL<<16)
+#define BNX2_RBUF_CONFIG3_CU_KEEP_TRIP_VAL(mtu) \
+ ((((mtu) - 1500) * 2 / 100) + 30)
+#define BNX2_RBUF_CONFIG3_VAL(mtu) \
+ (BNX2_RBUF_CONFIG3_CU_DROP_TRIP_VAL(mtu) | \
+ (BNX2_RBUF_CONFIG3_CU_KEEP_TRIP_VAL(mtu) << 16))
#define BNX2_RBUF_PKT_DATA 0x00208000
#define BNX2_RBUF_CLIST_DATA 0x00210000