qlcnic: fix estimation of receive MSS in case of LRO for 83xx adapter

Set gso_size to MSS obtained from adapter to avoid incorrect estimation
of receive MSS, which would lead to delayed ACKs in some traffic patterns

Example:
Send two or three packets and wait for ack and only then send
remaining packets.

Signed-off-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: Jitendra Kalsaria <jitendra.kalsaria@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 29 insertions, 9 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.h b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.h
index 127fa273e421..61f81f6c84a9 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.h
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_hw.h
@@ -223,6 +223,7 @@ struct qlc_83xx_idc {
 #define QLC_83XX_GET_LSO_CAPABILITY(val)                (val & 0x40)
 #define QLC_83XX_GET_HW_LRO_CAPABILITY(val)             (val & 0x400)
 #define QLC_83XX_GET_VLAN_ALIGN_CAPABILITY(val) (val & 0x4000)
+#define QLC_83XX_GET_FW_LRO_MSS_CAPABILITY(val) (val & 0x20000)
 #define QLC_83XX_VIRTUAL_NIC_MODE                       0xFF
 #define QLC_83XX_DEFAULT_MODE                           0x0
 #define QLCNIC_BRDTYPE_83XX_10G                 0x0083
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
index 662292de1486..2990f45df787 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
@@ -88,6 +88,8 @@
 #define qlcnic_get_lro_sts_mss(sts_data1)               \
         ((sts_data1 >> 32) & 0x0FFFF)
 
+#define qlcnic_83xx_get_lro_sts_mss(sts) ((sts) & 0xffff)
+
 /* opcode field in status_desc */
 #define QLCNIC_SYN_OFFLOAD      0x03
 #define QLCNIC_RXPKT_DESC       0x04
@@ -1423,7 +1425,7 @@ qlcnic_83xx_process_lro(struct qlcnic_adapter *adapter,
         bool push;
         int l2_hdr_offset, l4_hdr_offset;
         int index;
-        u16 lro_length, length, data_offset;
+        u16 lro_length, length, data_offset, gso_size;
         u16 vid = 0xffff;
 
         if (unlikely(ring > adapter->max_rds_rings))
@@ -1478,6 +1480,15 @@ qlcnic_83xx_process_lro(struct qlcnic_adapter *adapter,
         th->psh = push;
         length = skb->len;
 
+        if (adapter->flags & QLCNIC_FW_LRO_MSS_CAP) {
+                gso_size = qlcnic_83xx_get_lro_sts_mss(sts_data[0]);
+                skb_shinfo(skb)->gso_size = gso_size;
+                if (skb->protocol == htons(ETH_P_IPV6))
+                        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
+                else
+                        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
+        }
+
         if (vid != 0xffff)
                 __vlan_hwaccel_put_tag(skb, vid);
 
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index 3a0f18215d62..e03017a999b4 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -1339,11 +1339,24 @@ qlcnic_free_irq(struct qlcnic_adapter *adapter)
         }
 }
 
+static void qlcnic_get_lro_mss_capability(struct qlcnic_adapter *adapter)
+{
+        u32 capab = 0;
+
+        if (qlcnic_82xx_check(adapter)) {
+                if (adapter->ahw->capabilities2 &
+                    QLCNIC_FW_CAPABILITY_2_LRO_MAX_TCP_SEG)
+                        adapter->flags |= QLCNIC_FW_LRO_MSS_CAP;
+        } else {
+                capab = adapter->ahw->capabilities;
+                if (QLC_83XX_GET_FW_LRO_MSS_CAPABILITY(capab))
+                        adapter->flags |= QLCNIC_FW_LRO_MSS_CAP;
+        }
+}
+
 int __qlcnic_up(struct qlcnic_adapter *adapter, struct net_device *netdev)
 {
         int ring;
-        u32 capab2;
-
         struct qlcnic_host_rds_ring *rds_ring;
 
         if (adapter->is_up != QLCNIC_ADAPTER_UP_MAGIC)
@@ -1353,12 +1366,7 @@ int __qlcnic_up(struct qlcnic_adapter *adapter, struct net_device *netdev)
                 return 0;
         if (qlcnic_set_eswitch_port_config(adapter))
                 return -EIO;
-
-        if (adapter->ahw->capabilities & QLCNIC_FW_CAPABILITY_MORE_CAPS) {
-                capab2 = QLCRD32(adapter, CRB_FW_CAPABILITIES_2);
-                if (capab2 & QLCNIC_FW_CAPABILITY_2_LRO_MAX_TCP_SEG)
-                        adapter->flags |= QLCNIC_FW_LRO_MSS_CAP;
-        }
+        qlcnic_get_lro_mss_capability(adapter);
 
         if (qlcnic_fw_create_ctx(adapter))
                 return -EIO;