Enable Delayed ACK to reduce the number of TCP ACKs.
Signed-off-by: Varun Prakash <varun@xxxxxxxxxxx>
---
drivers/target/iscsi/cxgbit/cxgbit_cm.c | 8 +++-----
drivers/target/iscsi/cxgbit/cxgbit_target.c | 28 +++++++++++++++++++++++-----
2 files changed, 26 insertions(+), 10 deletions(-)
diff --git a/drivers/target/iscsi/cxgbit/cxgbit_cm.c b/drivers/target/iscsi/cxgbit/cxgbit_cm.c
index 518ded2..da31a30 100644
--- a/drivers/target/iscsi/cxgbit/cxgbit_cm.c
+++ b/drivers/target/iscsi/cxgbit/cxgbit_cm.c
@@ -836,11 +836,13 @@ static void cxgbit_set_tcp_window(struct cxgbit_sock *csk, struct port_info *pi)
csk->rcv_win = CXGBIT_10G_RCV_WIN;
if (scale)
csk->rcv_win *= scale;
+ csk->rcv_win = min(csk->rcv_win, RCV_BUFSIZ_M << 10);
#define CXGBIT_10G_SND_WIN (256 * 1024)
csk->snd_win = CXGBIT_10G_SND_WIN;
if (scale)
csk->snd_win *= scale;
+ csk->snd_win = min(csk->snd_win, 512U * 1024);
pr_debug("%s snd_win %d rcv_win %d\n",
__func__, csk->snd_win, csk->rcv_win);
@@ -1065,7 +1067,7 @@ int cxgbit_rx_data_ack(struct cxgbit_sock *csk)
if (!skb)
return -1;
- credit_dack = RX_DACK_CHANGE_F | RX_DACK_MODE_V(1) |
+ credit_dack = RX_DACK_CHANGE_F | RX_DACK_MODE_V(3) |
RX_CREDITS_V(csk->rx_credits);
cxgb_mk_rx_data_ack(skb, len, csk->tid, csk->ctrlq_idx,
@@ -1197,7 +1199,6 @@ cxgbit_pass_accept_rpl(struct cxgbit_sock *csk, struct cpl_pass_accept_req *req)
if (tcph->ece && tcph->cwr)
opt2 |= CCTRL_ECN_V(1);
- opt2 |= RX_COALESCE_V(3);
opt2 |= CONG_CNTRL_V(CONG_ALG_NEWRENO);
opt2 |= T5_ISS_F;
@@ -1646,9 +1647,6 @@ cxgbit_pass_establish(struct cxgbit_device *cdev, struct sk_buff *skb)
csk->rcv_nxt = rcv_isn;
- if (csk->rcv_win > (RCV_BUFSIZ_M << 10))
- csk->rx_credits = (csk->rcv_win - (RCV_BUFSIZ_M << 10));
-
csk->snd_wscale = TCPOPT_SND_WSCALE_G(tcp_opt);
cxgbit_set_emss(csk, tcp_opt);
dst_confirm(csk->dst);
diff --git a/drivers/target/iscsi/cxgbit/cxgbit_target.c b/drivers/target/iscsi/cxgbit/cxgbit_target.c
index 282297f..d314ee1 100644
--- a/drivers/target/iscsi/cxgbit/cxgbit_target.c
+++ b/drivers/target/iscsi/cxgbit/cxgbit_target.c
@@ -189,8 +189,8 @@ cxgbit_tx_data_wr(struct cxgbit_sock *csk, struct sk_buff *skb, u32 dlen,
wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP_MODE_ISCSI) |
FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
- req->tunnel_to_proxy = htonl((wr_ulp_mode) | force |
- FW_OFLD_TX_DATA_WR_SHOVE_V(skb_peek(&csk->txq) ? 0 : 1));
+ req->tunnel_to_proxy = htonl(wr_ulp_mode | force |
+ FW_OFLD_TX_DATA_WR_SHOVE_F);
}
static void cxgbit_arp_failure_skb_discard(void *handle, struct sk_buff *skb)
@@ -1531,7 +1531,7 @@ static int cxgbit_process_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
return ret;
}
-static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
+static int cxgbit_t5_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
{
struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
@@ -1557,6 +1557,24 @@ static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
return ret;
}
+static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
+{
+ struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
+ int ret;
+
+ ret = cxgbit_process_lro_skb(csk, skb);
+ if (ret)
+ return ret;
+
+ csk->rx_credits += lro_cb->pdu_totallen;
+ if (csk->rx_credits >= csk->rcv_win) {
+ csk->rx_credits = 0;
+ cxgbit_rx_data_ack(csk);
+ }
+
+ return 0;
+}
+
static int cxgbit_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
{
struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
@@ -1564,9 +1582,9 @@ static int cxgbit_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
if (likely(cxgbit_skcb_flags(skb) & SKCBF_RX_LRO)) {
if (is_t5(lldi->adapter_type))
- ret = cxgbit_rx_lro_skb(csk, skb);
+ ret = cxgbit_t5_rx_lro_skb(csk, skb);
else
- ret = cxgbit_process_lro_skb(csk, skb);
+ ret = cxgbit_rx_lro_skb(csk, skb);
}
__kfree_skb(skb);
--
2.0.2
