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path: root/drivers/net/e1000
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-rw-r--r--drivers/net/e1000/e1000_hw.c2
-rw-r--r--drivers/net/e1000/e1000_hw.h3
-rw-r--r--drivers/net/e1000/e1000_main.c58
3 files changed, 33 insertions, 30 deletions
diff --git a/drivers/net/e1000/e1000_hw.c b/drivers/net/e1000/e1000_hw.c
index e1a3fc1303ee..1e5ae112d57a 100644
--- a/drivers/net/e1000/e1000_hw.c
+++ b/drivers/net/e1000/e1000_hw.c
@@ -1955,7 +1955,7 @@ static s32 e1000_setup_copper_link(struct e1000_hw *hw)
s32 ret_val;
u16 i;
u16 phy_data;
- u16 reg_data;
+ u16 reg_data = 0;
DEBUGFUNC("e1000_setup_copper_link");
diff --git a/drivers/net/e1000/e1000_hw.h b/drivers/net/e1000/e1000_hw.h
index 99fce2c5dd26..a8866bdbb671 100644
--- a/drivers/net/e1000/e1000_hw.h
+++ b/drivers/net/e1000/e1000_hw.h
@@ -523,11 +523,8 @@ s32 e1000_check_phy_reset_block(struct e1000_hw *hw);
/* The sizes (in bytes) of a ethernet packet */
#define ENET_HEADER_SIZE 14
-#define MAXIMUM_ETHERNET_FRAME_SIZE 1518 /* With FCS */
#define MINIMUM_ETHERNET_FRAME_SIZE 64 /* With FCS */
#define ETHERNET_FCS_SIZE 4
-#define MAXIMUM_ETHERNET_PACKET_SIZE \
- (MAXIMUM_ETHERNET_FRAME_SIZE - ETHERNET_FCS_SIZE)
#define MINIMUM_ETHERNET_PACKET_SIZE \
(MINIMUM_ETHERNET_FRAME_SIZE - ETHERNET_FCS_SIZE)
#define CRC_LENGTH ETHERNET_FCS_SIZE
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index f2db9e2069e7..d7df00c2dbd6 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -641,8 +641,8 @@ void e1000_reset(struct e1000_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
u32 pba = 0, tx_space, min_tx_space, min_rx_space;
- u16 fc_high_water_mark = E1000_FC_HIGH_DIFF;
bool legacy_pba_adjust = false;
+ u16 hwm;
/* Repartition Pba for greater than 9k mtu
* To take effect CTRL.RST is required.
@@ -686,7 +686,7 @@ void e1000_reset(struct e1000_adapter *adapter)
}
if (legacy_pba_adjust) {
- if (adapter->netdev->mtu > E1000_RXBUFFER_8192)
+ if (hw->max_frame_size > E1000_RXBUFFER_8192)
pba -= 8; /* allocate more FIFO for Tx */
if (hw->mac_type == e1000_82547) {
@@ -696,14 +696,14 @@ void e1000_reset(struct e1000_adapter *adapter)
(E1000_PBA_40K - pba) << E1000_PBA_BYTES_SHIFT;
atomic_set(&adapter->tx_fifo_stall, 0);
}
- } else if (hw->max_frame_size > MAXIMUM_ETHERNET_FRAME_SIZE) {
+ } else if (hw->max_frame_size > ETH_FRAME_LEN + ETH_FCS_LEN) {
/* adjust PBA for jumbo frames */
ew32(PBA, pba);
/* To maintain wire speed transmits, the Tx FIFO should be
- * large enough to accomodate two full transmit packets,
+ * large enough to accommodate two full transmit packets,
* rounded up to the next 1KB and expressed in KB. Likewise,
- * the Rx FIFO should be large enough to accomodate at least
+ * the Rx FIFO should be large enough to accommodate at least
* one full receive packet and is similarly rounded up and
* expressed in KB. */
pba = er32(PBA);
@@ -711,13 +711,17 @@ void e1000_reset(struct e1000_adapter *adapter)
tx_space = pba >> 16;
/* lower 16 bits has Rx packet buffer allocation size in KB */
pba &= 0xffff;
- /* don't include ethernet FCS because hardware appends/strips */
- min_rx_space = adapter->netdev->mtu + ENET_HEADER_SIZE +
- VLAN_TAG_SIZE;
- min_tx_space = min_rx_space;
- min_tx_space *= 2;
+ /*
+ * the tx fifo also stores 16 bytes of information about the tx
+ * but don't include ethernet FCS because hardware appends it
+ */
+ min_tx_space = (hw->max_frame_size +
+ sizeof(struct e1000_tx_desc) -
+ ETH_FCS_LEN) * 2;
min_tx_space = ALIGN(min_tx_space, 1024);
min_tx_space >>= 10;
+ /* software strips receive CRC, so leave room for it */
+ min_rx_space = hw->max_frame_size;
min_rx_space = ALIGN(min_rx_space, 1024);
min_rx_space >>= 10;
@@ -754,19 +758,21 @@ void e1000_reset(struct e1000_adapter *adapter)
ew32(PBA, pba);
- /* flow control settings */
- /* Set the FC high water mark to 90% of the FIFO size.
- * Required to clear last 3 LSB */
- fc_high_water_mark = ((pba * 9216)/10) & 0xFFF8;
- /* We can't use 90% on small FIFOs because the remainder
- * would be less than 1 full frame. In this case, we size
- * it to allow at least a full frame above the high water
- * mark. */
- if (pba < E1000_PBA_16K)
- fc_high_water_mark = (pba * 1024) - 1600;
-
- hw->fc_high_water = fc_high_water_mark;
- hw->fc_low_water = fc_high_water_mark - 8;
+ /*
+ * flow control settings:
+ * The high water mark must be low enough to fit one full frame
+ * (or the size used for early receive) above it in the Rx FIFO.
+ * Set it to the lower of:
+ * - 90% of the Rx FIFO size, and
+ * - the full Rx FIFO size minus the early receive size (for parts
+ * with ERT support assuming ERT set to E1000_ERT_2048), or
+ * - the full Rx FIFO size minus one full frame
+ */
+ hwm = min(((pba << 10) * 9 / 10),
+ ((pba << 10) - hw->max_frame_size));
+
+ hw->fc_high_water = hwm & 0xFFF8; /* 8-byte granularity */
+ hw->fc_low_water = hw->fc_high_water - 8;
hw->fc_pause_time = E1000_FC_PAUSE_TIME;
hw->fc_send_xon = 1;
hw->fc = hw->original_fc;
@@ -3474,7 +3480,7 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
switch (hw->mac_type) {
case e1000_undefined ... e1000_82542_rev2_1:
case e1000_ich8lan:
- if (max_frame > MAXIMUM_ETHERNET_FRAME_SIZE) {
+ if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
DPRINTK(PROBE, ERR, "Jumbo Frames not supported.\n");
return -EINVAL;
}
@@ -3487,7 +3493,7 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
&eeprom_data);
if ((hw->device_id != E1000_DEV_ID_82573L) ||
(eeprom_data & EEPROM_WORD1A_ASPM_MASK)) {
- if (max_frame > MAXIMUM_ETHERNET_FRAME_SIZE) {
+ if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
DPRINTK(PROBE, ERR,
"Jumbo Frames not supported.\n");
return -EINVAL;
@@ -3535,7 +3541,7 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
/* adjust allocation if LPE protects us, and we aren't using SBP */
if (!hw->tbi_compatibility_on &&
- ((max_frame == MAXIMUM_ETHERNET_FRAME_SIZE) ||
+ ((max_frame == (ETH_FRAME_LEN + ETH_FCS_LEN)) ||
(max_frame == MAXIMUM_ETHERNET_VLAN_SIZE)))
adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-28 19:22:54 +0300