net: qed: sanitize BE/LE data processing

Current code assumes that both host and device operates in Little Endian
in lots of places. While this is true for x86 platform, this doesn't mean
we should not care about this.

This commit addresses all parts of the code that were pointed out by sparse
checker. All operations with restricted (__be*/__le*) types are now
protected with explicit from/to CPU conversions, even if they're noops on
common setups.

I'm sure there are more such places, but this implies a deeper code
investigation, and is a subject for future works.

Signed-off-by: Alexander Lobakin <alobakin@marvell.com>
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 26 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_fcoe.c b/drivers/net/ethernet/qlogic/qed/qed_fcoe.c
index a10e57bba6b9..b768f0698170 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_fcoe.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_fcoe.c
@@ -95,7 +95,7 @@ qed_sp_fcoe_func_start(struct qed_hwfn *p_hwfn,
 	struct qed_cxt_info cxt_info;
 	u32 dummy_cid;
 	int rc = 0;
-	u16 tmp;
+	__le16 tmp;
 	u8 i;
 
 	/* Get SPQ entry */
@@ -162,17 +162,13 @@ qed_sp_fcoe_func_start(struct qed_hwfn *p_hwfn,
 	tmp = cpu_to_le16(fcoe_pf_params->cmdq_num_entries);
 	p_data->q_params.cmdq_num_entries = tmp;
 
-	tmp = fcoe_pf_params->num_cqs;
-	p_data->q_params.num_queues = (u8)tmp;
+	p_data->q_params.num_queues = fcoe_pf_params->num_cqs;
 
-	tmp = (u16)p_hwfn->hw_info.resc_start[QED_CMDQS_CQS];
-	p_data->q_params.queue_relative_offset = (u8)tmp;
+	tmp = (__force __le16)p_hwfn->hw_info.resc_start[QED_CMDQS_CQS];
+	p_data->q_params.queue_relative_offset = (__force u8)tmp;
 
 	for (i = 0; i < fcoe_pf_params->num_cqs; i++) {
-		u16 igu_sb_id;
-
-		igu_sb_id = qed_get_igu_sb_id(p_hwfn, i);
-		tmp = cpu_to_le16(igu_sb_id);
+		tmp = cpu_to_le16(qed_get_igu_sb_id(p_hwfn, i));
 		p_data->q_params.cq_cmdq_sb_num_arr[i] = tmp;
 	}
 
@@ -185,21 +181,21 @@ qed_sp_fcoe_func_start(struct qed_hwfn *p_hwfn,
 		       fcoe_pf_params->bdq_pbl_base_addr[BDQ_ID_RQ]);
 	p_data->q_params.bdq_pbl_num_entries[BDQ_ID_RQ] =
 	    fcoe_pf_params->bdq_pbl_num_entries[BDQ_ID_RQ];
-	tmp = fcoe_pf_params->bdq_xoff_threshold[BDQ_ID_RQ];
-	p_data->q_params.bdq_xoff_threshold[BDQ_ID_RQ] = cpu_to_le16(tmp);
-	tmp = fcoe_pf_params->bdq_xon_threshold[BDQ_ID_RQ];
-	p_data->q_params.bdq_xon_threshold[BDQ_ID_RQ] = cpu_to_le16(tmp);
+	tmp = cpu_to_le16(fcoe_pf_params->bdq_xoff_threshold[BDQ_ID_RQ]);
+	p_data->q_params.bdq_xoff_threshold[BDQ_ID_RQ] = tmp;
+	tmp = cpu_to_le16(fcoe_pf_params->bdq_xon_threshold[BDQ_ID_RQ]);
+	p_data->q_params.bdq_xon_threshold[BDQ_ID_RQ] = tmp;
 
 	DMA_REGPAIR_LE(p_data->q_params.bdq_pbl_base_address[BDQ_ID_IMM_DATA],
 		       fcoe_pf_params->bdq_pbl_base_addr[BDQ_ID_IMM_DATA]);
 	p_data->q_params.bdq_pbl_num_entries[BDQ_ID_IMM_DATA] =
 	    fcoe_pf_params->bdq_pbl_num_entries[BDQ_ID_IMM_DATA];
-	tmp = fcoe_pf_params->bdq_xoff_threshold[BDQ_ID_IMM_DATA];
-	p_data->q_params.bdq_xoff_threshold[BDQ_ID_IMM_DATA] = cpu_to_le16(tmp);
-	tmp = fcoe_pf_params->bdq_xon_threshold[BDQ_ID_IMM_DATA];
-	p_data->q_params.bdq_xon_threshold[BDQ_ID_IMM_DATA] = cpu_to_le16(tmp);
-	tmp = fcoe_pf_params->rq_buffer_size;
-	p_data->q_params.rq_buffer_size = cpu_to_le16(tmp);
+	tmp = cpu_to_le16(fcoe_pf_params->bdq_xoff_threshold[BDQ_ID_IMM_DATA]);
+	p_data->q_params.bdq_xoff_threshold[BDQ_ID_IMM_DATA] = tmp;
+	tmp = cpu_to_le16(fcoe_pf_params->bdq_xon_threshold[BDQ_ID_IMM_DATA]);
+	p_data->q_params.bdq_xon_threshold[BDQ_ID_IMM_DATA] = tmp;
+	tmp = cpu_to_le16(fcoe_pf_params->rq_buffer_size);
+	p_data->q_params.rq_buffer_size = tmp;
 
 	if (fcoe_pf_params->is_target) {
 		SET_FIELD(p_data->q_params.q_validity,
@@ -233,7 +229,8 @@ qed_sp_fcoe_conn_offload(struct qed_hwfn *p_hwfn,
 	struct fcoe_conn_offload_ramrod_data *p_data;
 	struct qed_spq_entry *p_ent = NULL;
 	struct qed_sp_init_data init_data;
-	u16 physical_q0, tmp;
+	u16 physical_q0;
+	__le16 tmp;
 	int rc;
 
 	/* Get SPQ entry */
@@ -254,7 +251,7 @@ qed_sp_fcoe_conn_offload(struct qed_hwfn *p_hwfn,
 
 	/* Transmission PQ is the first of the PF */
 	physical_q0 = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_OFLD);
-	p_conn->physical_q0 = cpu_to_le16(physical_q0);
+	p_conn->physical_q0 = physical_q0;
 	p_data->physical_q0 = cpu_to_le16(physical_q0);
 
 	p_data->conn_id = cpu_to_le16(p_conn->conn_id);
@@ -553,8 +550,8 @@ int qed_fcoe_alloc(struct qed_hwfn *p_hwfn)
 void qed_fcoe_setup(struct qed_hwfn *p_hwfn)
 {
 	struct e4_fcoe_task_context *p_task_ctx = NULL;
+	u32 i, lc;
 	int rc;
-	u32 i;
 
 	spin_lock_init(&p_hwfn->p_fcoe_info->lock);
 	for (i = 0; i < p_hwfn->pf_params.fcoe_pf_params.num_tasks; i++) {
@@ -565,10 +562,15 @@ void qed_fcoe_setup(struct qed_hwfn *p_hwfn)
 			continue;
 
 		memset(p_task_ctx, 0, sizeof(struct e4_fcoe_task_context));
-		SET_FIELD(p_task_ctx->timer_context.logical_client_0,
-			  TIMERS_CONTEXT_VALIDLC0, 1);
-		SET_FIELD(p_task_ctx->timer_context.logical_client_1,
-			  TIMERS_CONTEXT_VALIDLC1, 1);
+
+		lc = 0;
+		SET_FIELD(lc, TIMERS_CONTEXT_VALIDLC0, 1);
+		p_task_ctx->timer_context.logical_client_0 = cpu_to_le32(lc);
+
+		lc = 0;
+		SET_FIELD(lc, TIMERS_CONTEXT_VALIDLC1, 1);
+		p_task_ctx->timer_context.logical_client_1 = cpu_to_le32(lc);
+
 		SET_FIELD(p_task_ctx->tstorm_ag_context.flags0,
 			  E4_TSTORM_FCOE_TASK_AG_CTX_CONNECTION_TYPE, 1);
 	}