qlcnic: Fix estimation of recv MSS in case of LRO

o Linux stack estimates MSS from skb->len or skb_shinfo(skb)->gso_size.
In case of LRO skb->len is aggregate of len of number of packets hence MSS
obtained using skb->len would be incorrect. Incorrect estimation of recv MSS
would lead to delayed acks in some traffic patterns (which sends two or three
packets and wait for ack and only then send remaining packets). This leads to
drop in performance. Hence we need to set gso_size to MSS obtained from firmware.

o This is fixed recently in firmware hence the MSS is obtained based on
capability. If fw is capable of sending the MSS then only driver sets the gso_size.

Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: Anirban Chakraborty <anirban.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
index 8680a5dae4a2..520ff031cfaa 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic.h
@@ -258,6 +258,8 @@ struct rcv_desc {
         (((sts_data) >> 52) & 0x1)
 #define qlcnic_get_lro_sts_seq_number(sts_data)         \
         ((sts_data) & 0x0FFFFFFFF)
+#define qlcnic_get_lro_sts_mss(sts_data1)               \
+        ((sts_data1 >> 32) & 0x0FFFF)
 
 
 struct status_desc {
@@ -623,6 +625,7 @@ struct qlcnic_recv_context {
 #define QLCNIC_CAP0_JUMBO_CONTIGUOUS    (1 << 7)
 #define QLCNIC_CAP0_LRO_CONTIGUOUS      (1 << 8)
 #define QLCNIC_CAP0_VALIDOFF            (1 << 11)
+#define QLCNIC_CAP0_LRO_MSS             (1 << 21)
 
 /*
  * Context state
@@ -829,6 +832,9 @@ struct qlcnic_mac_list_s {
 #define QLCNIC_FW_CAPABILITY_FVLANTX            BIT_9
 #define QLCNIC_FW_CAPABILITY_HW_LRO             BIT_10
 #define QLCNIC_FW_CAPABILITY_MULTI_LOOPBACK     BIT_27
+#define QLCNIC_FW_CAPABILITY_MORE_CAPS          BIT_31
+
+#define QLCNIC_FW_CAPABILITY_2_LRO_MAX_TCP_SEG  BIT_2
 
 /* module types */
 #define LINKEVENT_MODULE_NOT_PRESENT                    1
@@ -918,6 +924,7 @@ struct qlcnic_ipaddr {
 #define QLCNIC_NEED_FLR                 0x1000
 #define QLCNIC_FW_RESET_OWNER           0x2000
 #define QLCNIC_FW_HANG                  0x4000
+#define QLCNIC_FW_LRO_MSS_CAP           0x8000
 #define QLCNIC_IS_MSI_FAMILY(adapter) \
         ((adapter)->flags & (QLCNIC_MSI_ENABLED | QLCNIC_MSIX_ENABLED))