i40iw: Fix sequence number for the first partial FPDU

[ Upstream commit df8b13a1 ]

Partial FPDU processing is broken as the sequence number
for the first partial FPDU is wrong due to incorrect
Q2 buffer offset. The offset should be 64 rather than 16.

Fixes: 786c6adb ("i40iw: add puda code")
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/infiniband/hw/i40iw/i40iw_d.h

@@ -93,6 +93,7 @@
 #define RDMA_OPCODE_MASK        0x0f
 #define RDMA_READ_REQ_OPCODE    1
 #define Q2_BAD_FRAME_OFFSET     72
+#define Q2_FPSN_OFFSET          64
 #define CQE_MAJOR_DRV           0x8000
 
 #define I40IW_TERM_SENT 0x01

drivers/infiniband/hw/i40iw/i40iw_puda.c

@@ -1376,7 +1376,7 @@ static void i40iw_ieq_handle_exception(struct i40iw_puda_rsrc *ieq,
 	u32 *hw_host_ctx = (u32 *)qp->hw_host_ctx;
 	u32 rcv_wnd = hw_host_ctx[23];
 	/* first partial seq # in q2 */
-	u32 fps = qp->q2_buf[16];
+	u32 fps = *(u32 *)(qp->q2_buf + Q2_FPSN_OFFSET);
 	struct list_head *rxlist = &pfpdu->rxlist;
 	struct list_head *plist;