Merge branch 'qed-management-interaction-and-feature-changes'

Yuval Mintz says:

====================
qed: Management interaction & feature changes

All patches in this series either affect direct interaction with the
management firmware, or changes logic relating to some values retrieved
from it.

Patch #1 revises the basic logic for sending messages to the management
firmware and there completion, and is the most significant [at least
code-wise] of the bunch.

Patch #2 changes infrastrcure in a way that should better protect us form
mistakes leading to stack corruption such as was fixed in
bb4802428432 ("qed: Prevent stack corruption on MFW interaction").

Patch #3 corrects some update API endian issue [sent here as it would
create conflicts with #2, and because it's lack would create a rather
insignifcant problem].

Patch #4 removes some unnecessary logging, allowing cleaner forward
compatibility with future management firmware versions.

Patches #5, #6 slightly change the number of possible L2 queues in some
scenarios, leading to the possibility of having more queues / VFS.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 373 insertions, 207 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_dev.c b/drivers/net/ethernet/qlogic/qed/qed_dev.c
index 8b5df71aa3c1..11e45f0f7779 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_dev.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_dev.c
@@ -1550,7 +1550,7 @@ static void qed_hw_set_feat(struct qed_hwfn *p_hwfn)
 {
 	u32 *feat_num = p_hwfn->hw_info.feat_num;
 	struct qed_sb_cnt_info sb_cnt_info;
-	int num_features = 1;
+	u32 non_l2_sbs = 0;
 
 	if (IS_ENABLED(CONFIG_QED_RDMA) &&
 	    p_hwfn->hw_info.personality == QED_PCI_ETH_ROCE) {
@@ -1558,31 +1558,37 @@ static void qed_hw_set_feat(struct qed_hwfn *p_hwfn)
 		 * the status blocks equally between L2 / RoCE but with
 		 * consideration as to how many l2 queues / cnqs we have.
 		 */
-		num_features++;
-
 		feat_num[QED_RDMA_CNQ] =
-			min_t(u32, RESC_NUM(p_hwfn, QED_SB) / num_features,
+			min_t(u32, RESC_NUM(p_hwfn, QED_SB) / 2,
 			      RESC_NUM(p_hwfn, QED_RDMA_CNQ_RAM));
-	}
 
-	feat_num[QED_PF_L2_QUE] = min_t(u32, RESC_NUM(p_hwfn, QED_SB) /
-						num_features,
-					RESC_NUM(p_hwfn, QED_L2_QUEUE));
+		non_l2_sbs = feat_num[QED_RDMA_CNQ];
+	}
 
-	memset(&sb_cnt_info, 0, sizeof(sb_cnt_info));
-	qed_int_get_num_sbs(p_hwfn, &sb_cnt_info);
-	feat_num[QED_VF_L2_QUE] =
-	    min_t(u32,
-		  RESC_NUM(p_hwfn, QED_L2_QUEUE) -
-		  FEAT_NUM(p_hwfn, QED_PF_L2_QUE), sb_cnt_info.sb_iov_cnt);
+	if (p_hwfn->hw_info.personality == QED_PCI_ETH_ROCE ||
+	    p_hwfn->hw_info.personality == QED_PCI_ETH) {
+		/* Start by allocating VF queues, then PF's */
+		memset(&sb_cnt_info, 0, sizeof(sb_cnt_info));
+		qed_int_get_num_sbs(p_hwfn, &sb_cnt_info);
+		feat_num[QED_VF_L2_QUE] = min_t(u32,
+						RESC_NUM(p_hwfn, QED_L2_QUEUE),
+						sb_cnt_info.sb_iov_cnt);
+		feat_num[QED_PF_L2_QUE] = min_t(u32,
+						RESC_NUM(p_hwfn, QED_SB) -
+						non_l2_sbs,
+						RESC_NUM(p_hwfn,
+							 QED_L2_QUEUE) -
+						FEAT_NUM(p_hwfn,
+							 QED_VF_L2_QUE));
+	}
 
 	DP_VERBOSE(p_hwfn,
 		   NETIF_MSG_PROBE,
-		   "#PF_L2_QUEUES=%d VF_L2_QUEUES=%d #ROCE_CNQ=%d #SBS=%d num_features=%d\n",
+		   "#PF_L2_QUEUES=%d VF_L2_QUEUES=%d #ROCE_CNQ=%d #SBS=%d\n",
 		   (int)FEAT_NUM(p_hwfn, QED_PF_L2_QUE),
 		   (int)FEAT_NUM(p_hwfn, QED_VF_L2_QUE),
 		   (int)FEAT_NUM(p_hwfn, QED_RDMA_CNQ),
-		   RESC_NUM(p_hwfn, QED_SB), num_features);
+		   RESC_NUM(p_hwfn, QED_SB));
 }
 
 static enum resource_id_enum qed_hw_get_mfw_res_id(enum qed_resources res_id)
diff --git a/drivers/net/ethernet/qlogic/qed/qed_mcp.c b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
index 87fde205149f..ccea0eae7b60 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_mcp.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
@@ -111,12 +111,71 @@ void qed_mcp_read_mb(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 	}
 }
 
+struct qed_mcp_cmd_elem {
+	struct list_head list;
+	struct qed_mcp_mb_params *p_mb_params;
+	u16 expected_seq_num;
+	bool b_is_completed;
+};
+
+/* Must be called while cmd_lock is acquired */
+static struct qed_mcp_cmd_elem *
+qed_mcp_cmd_add_elem(struct qed_hwfn *p_hwfn,
+		     struct qed_mcp_mb_params *p_mb_params,
+		     u16 expected_seq_num)
+{
+	struct qed_mcp_cmd_elem *p_cmd_elem = NULL;
+
+	p_cmd_elem = kzalloc(sizeof(*p_cmd_elem), GFP_ATOMIC);
+	if (!p_cmd_elem)
+		goto out;
+
+	p_cmd_elem->p_mb_params = p_mb_params;
+	p_cmd_elem->expected_seq_num = expected_seq_num;
+	list_add(&p_cmd_elem->list, &p_hwfn->mcp_info->cmd_list);
+out:
+	return p_cmd_elem;
+}
+
+/* Must be called while cmd_lock is acquired */
+static void qed_mcp_cmd_del_elem(struct qed_hwfn *p_hwfn,
+				 struct qed_mcp_cmd_elem *p_cmd_elem)
+{
+	list_del(&p_cmd_elem->list);
+	kfree(p_cmd_elem);
+}
+
+/* Must be called while cmd_lock is acquired */
+static struct qed_mcp_cmd_elem *qed_mcp_cmd_get_elem(struct qed_hwfn *p_hwfn,
+						     u16 seq_num)
+{
+	struct qed_mcp_cmd_elem *p_cmd_elem = NULL;
+
+	list_for_each_entry(p_cmd_elem, &p_hwfn->mcp_info->cmd_list, list) {
+		if (p_cmd_elem->expected_seq_num == seq_num)
+			return p_cmd_elem;
+	}
+
+	return NULL;
+}
+
 int qed_mcp_free(struct qed_hwfn *p_hwfn)
 {
 	if (p_hwfn->mcp_info) {
+		struct qed_mcp_cmd_elem *p_cmd_elem, *p_tmp;
+
 		kfree(p_hwfn->mcp_info->mfw_mb_cur);
 		kfree(p_hwfn->mcp_info->mfw_mb_shadow);
+
+		spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+		list_for_each_entry_safe(p_cmd_elem,
+					 p_tmp,
+					 &p_hwfn->mcp_info->cmd_list, list) {
+			qed_mcp_cmd_del_elem(p_hwfn, p_cmd_elem);
+		}
+		spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
 	}
+
 	kfree(p_hwfn->mcp_info);
 
 	return 0;
@@ -160,7 +219,7 @@ static int qed_load_mcp_offsets(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 	p_info->drv_pulse_seq = DRV_MB_RD(p_hwfn, p_ptt, drv_pulse_mb) &
 				DRV_PULSE_SEQ_MASK;
 
-	p_info->mcp_hist = (u16)qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
+	p_info->mcp_hist = qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
 
 	return 0;
 }
@@ -176,6 +235,12 @@ int qed_mcp_cmd_init(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 		goto err;
 	p_info = p_hwfn->mcp_info;
 
+	/* Initialize the MFW spinlock */
+	spin_lock_init(&p_info->cmd_lock);
+	spin_lock_init(&p_info->link_lock);
+
+	INIT_LIST_HEAD(&p_info->cmd_list);
+
 	if (qed_load_mcp_offsets(p_hwfn, p_ptt) != 0) {
 		DP_NOTICE(p_hwfn, "MCP is not initialized\n");
 		/* Do not free mcp_info here, since public_base indicate that
@@ -190,10 +255,6 @@ int qed_mcp_cmd_init(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 	if (!p_info->mfw_mb_shadow || !p_info->mfw_mb_addr)
 		goto err;
 
-	/* Initialize the MFW spinlock */
-	spin_lock_init(&p_info->lock);
-	spin_lock_init(&p_info->link_lock);
-
 	return 0;
 
 err:
@@ -201,68 +262,39 @@ err:
 	return -ENOMEM;
 }
 
-/* Locks the MFW mailbox of a PF to ensure a single access.
- * The lock is achieved in most cases by holding a spinlock, causing other
- * threads to wait till a previous access is done.
- * In some cases (currently when a [UN]LOAD_REQ commands are sent), the single
- * access is achieved by setting a blocking flag, which will fail other
- * competing contexts to send their mailboxes.
- */
-static int qed_mcp_mb_lock(struct qed_hwfn *p_hwfn, u32 cmd)
+static void qed_mcp_reread_offsets(struct qed_hwfn *p_hwfn,
+				   struct qed_ptt *p_ptt)
 {
-	spin_lock_bh(&p_hwfn->mcp_info->lock);
-
-	/* The spinlock shouldn't be acquired when the mailbox command is
-	 * [UN]LOAD_REQ, since the engine is locked by the MFW, and a parallel
-	 * pending [UN]LOAD_REQ command of another PF together with a spinlock
-	 * (i.e. interrupts are disabled) - can lead to a deadlock.
-	 * It is assumed that for a single PF, no other mailbox commands can be
-	 * sent from another context while sending LOAD_REQ, and that any
-	 * parallel commands to UNLOAD_REQ can be cancelled.
-	 */
-	if (cmd == DRV_MSG_CODE_LOAD_DONE || cmd == DRV_MSG_CODE_UNLOAD_DONE)
-		p_hwfn->mcp_info->block_mb_sending = false;
+	u32 generic_por_0 = qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
 
-	if (p_hwfn->mcp_info->block_mb_sending) {
-		DP_NOTICE(p_hwfn,
-			  "Trying to send a MFW mailbox command [0x%x] in parallel to [UN]LOAD_REQ. Aborting.\n",
-			  cmd);
-		spin_unlock_bh(&p_hwfn->mcp_info->lock);
-		return -EBUSY;
-	}
+	/* Use MCP history register to check if MCP reset occurred between init
+	 * time and now.
+	 */
+	if (p_hwfn->mcp_info->mcp_hist != generic_por_0) {
+		DP_VERBOSE(p_hwfn,
+			   QED_MSG_SP,
+			   "Rereading MCP offsets [mcp_hist 0x%08x, generic_por_0 0x%08x]\n",
+			   p_hwfn->mcp_info->mcp_hist, generic_por_0);
 
-	if (cmd == DRV_MSG_CODE_LOAD_REQ || cmd == DRV_MSG_CODE_UNLOAD_REQ) {
-		p_hwfn->mcp_info->block_mb_sending = true;
-		spin_unlock_bh(&p_hwfn->mcp_info->lock);
+		qed_load_mcp_offsets(p_hwfn, p_ptt);
+		qed_mcp_cmd_port_init(p_hwfn, p_ptt);
 	}
-
-	return 0;
-}
-
-static void qed_mcp_mb_unlock(struct qed_hwfn *p_hwfn, u32 cmd)
-{
-	if (cmd != DRV_MSG_CODE_LOAD_REQ && cmd != DRV_MSG_CODE_UNLOAD_REQ)
-		spin_unlock_bh(&p_hwfn->mcp_info->lock);
 }
 
 int qed_mcp_reset(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 {
-	u32 seq = ++p_hwfn->mcp_info->drv_mb_seq;
-	u8 delay = CHIP_MCP_RESP_ITER_US;
-	u32 org_mcp_reset_seq, cnt = 0;
+	u32 org_mcp_reset_seq, seq, delay = CHIP_MCP_RESP_ITER_US, cnt = 0;
 	int rc = 0;
 
-	/* Ensure that only a single thread is accessing the mailbox at a
-	 * certain time.
-	 */
-	rc = qed_mcp_mb_lock(p_hwfn, DRV_MSG_CODE_MCP_RESET);
-	if (rc != 0)
-		return rc;
+	/* Ensure that only a single thread is accessing the mailbox */
+	spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
 
-	/* Set drv command along with the updated sequence */
 	org_mcp_reset_seq = qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0);
-	DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header,
-		  (DRV_MSG_CODE_MCP_RESET | seq));
+
+	/* Set drv command along with the updated sequence */
+	qed_mcp_reread_offsets(p_hwfn, p_ptt);
+	seq = ++p_hwfn->mcp_info->drv_mb_seq;
+	DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header, (DRV_MSG_CODE_MCP_RESET | seq));
 
 	do {
 		/* Wait for MFW response */
@@ -281,72 +313,205 @@ int qed_mcp_reset(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 		rc = -EAGAIN;
 	}
 
-	qed_mcp_mb_unlock(p_hwfn, DRV_MSG_CODE_MCP_RESET);
+	spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
 
 	return rc;
 }
 
-static int qed_do_mcp_cmd(struct qed_hwfn *p_hwfn,
-			  struct qed_ptt *p_ptt,
-			  u32 cmd,
-			  u32 param,
-			  u32 *o_mcp_resp,
-			  u32 *o_mcp_param)
+/* Must be called while cmd_lock is acquired */
+static bool qed_mcp_has_pending_cmd(struct qed_hwfn *p_hwfn)
 {
-	u8 delay = CHIP_MCP_RESP_ITER_US;
-	u32 seq, cnt = 1, actual_mb_seq;
-	int rc = 0;
-
-	/* Get actual driver mailbox sequence */
-	actual_mb_seq = DRV_MB_RD(p_hwfn, p_ptt, drv_mb_header) &
-			DRV_MSG_SEQ_NUMBER_MASK;
+	struct qed_mcp_cmd_elem *p_cmd_elem;
 
-	/* Use MCP history register to check if MCP reset occurred between
-	 * init time and now.
+	/* There is at most one pending command at a certain time, and if it
+	 * exists - it is placed at the HEAD of the list.
 	 */
-	if (p_hwfn->mcp_info->mcp_hist !=
-	    qed_rd(p_hwfn, p_ptt, MISCS_REG_GENERIC_POR_0)) {
-		DP_VERBOSE(p_hwfn, QED_MSG_SP, "Rereading MCP offsets\n");
-		qed_load_mcp_offsets(p_hwfn, p_ptt);
-		qed_mcp_cmd_port_init(p_hwfn, p_ptt);
+	if (!list_empty(&p_hwfn->mcp_info->cmd_list)) {
+		p_cmd_elem = list_first_entry(&p_hwfn->mcp_info->cmd_list,
+					      struct qed_mcp_cmd_elem, list);
+		return !p_cmd_elem->b_is_completed;
 	}
-	seq = ++p_hwfn->mcp_info->drv_mb_seq;
 
-	/* Set drv param */
-	DRV_MB_WR(p_hwfn, p_ptt, drv_mb_param, param);
+	return false;
+}
 
-	/* Set drv command along with the updated sequence */
-	DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header, (cmd | seq));
+/* Must be called while cmd_lock is acquired */
+static int
+qed_mcp_update_pending_cmd(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
+{
+	struct qed_mcp_mb_params *p_mb_params;
+	struct qed_mcp_cmd_elem *p_cmd_elem;
+	u32 mcp_resp;
+	u16 seq_num;
+
+	mcp_resp = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_header);
+	seq_num = (u16)(mcp_resp & FW_MSG_SEQ_NUMBER_MASK);
+
+	/* Return if no new non-handled response has been received */
+	if (seq_num != p_hwfn->mcp_info->drv_mb_seq)
+		return -EAGAIN;
+
+	p_cmd_elem = qed_mcp_cmd_get_elem(p_hwfn, seq_num);
+	if (!p_cmd_elem) {
+		DP_ERR(p_hwfn,
+		       "Failed to find a pending mailbox cmd that expects sequence number %d\n",
+		       seq_num);
+		return -EINVAL;
+	}
+
+	p_mb_params = p_cmd_elem->p_mb_params;
+
+	/* Get the MFW response along with the sequence number */
+	p_mb_params->mcp_resp = mcp_resp;
+
+	/* Get the MFW param */
+	p_mb_params->mcp_param = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_param);
+
+	/* Get the union data */
+	if (p_mb_params->p_data_dst != NULL && p_mb_params->data_dst_size) {
+		u32 union_data_addr = p_hwfn->mcp_info->drv_mb_addr +
+				      offsetof(struct public_drv_mb,
+					       union_data);
+		qed_memcpy_from(p_hwfn, p_ptt, p_mb_params->p_data_dst,
+				union_data_addr, p_mb_params->data_dst_size);
+	}
+
+	p_cmd_elem->b_is_completed = true;
+
+	return 0;
+}
+
+/* Must be called while cmd_lock is acquired */
+static void __qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
+				    struct qed_ptt *p_ptt,
+				    struct qed_mcp_mb_params *p_mb_params,
+				    u16 seq_num)
+{
+	union drv_union_data union_data;
+	u32 union_data_addr;
+
+	/* Set the union data */
+	union_data_addr = p_hwfn->mcp_info->drv_mb_addr +
+			  offsetof(struct public_drv_mb, union_data);
+	memset(&union_data, 0, sizeof(union_data));
+	if (p_mb_params->p_data_src != NULL && p_mb_params->data_src_size)
+		memcpy(&union_data, p_mb_params->p_data_src,
+		       p_mb_params->data_src_size);
+	qed_memcpy_to(p_hwfn, p_ptt, union_data_addr, &union_data,
+		      sizeof(union_data));
+
+	/* Set the drv param */
+	DRV_MB_WR(p_hwfn, p_ptt, drv_mb_param, p_mb_params->param);
+
+	/* Set the drv command along with the sequence number */
+	DRV_MB_WR(p_hwfn, p_ptt, drv_mb_header, (p_mb_params->cmd | seq_num));
 
 	DP_VERBOSE(p_hwfn, QED_MSG_SP,
-		   "wrote command (%x) to MFW MB param 0x%08x\n",
-		   (cmd | seq), param);
+		   "MFW mailbox: command 0x%08x param 0x%08x\n",
+		   (p_mb_params->cmd | seq_num), p_mb_params->param);
+}
+
+static int
+_qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
+		       struct qed_ptt *p_ptt,
+		       struct qed_mcp_mb_params *p_mb_params,
+		       u32 max_retries, u32 delay)
+{
+	struct qed_mcp_cmd_elem *p_cmd_elem;
+	u32 cnt = 0;
+	u16 seq_num;
+	int rc = 0;
 
+	/* Wait until the mailbox is non-occupied */
 	do {
-		/* Wait for MFW response */
+		/* Exit the loop if there is no pending command, or if the
+		 * pending command is completed during this iteration.
+		 * The spinlock stays locked until the command is sent.
+		 */
+
+		spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+		if (!qed_mcp_has_pending_cmd(p_hwfn))
+			break;
+
+		rc = qed_mcp_update_pending_cmd(p_hwfn, p_ptt);
+		if (!rc)
+			break;
+		else if (rc != -EAGAIN)
+			goto err;
+
+		spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
 		udelay(delay);
-		*o_mcp_resp = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_header);
+	} while (++cnt < max_retries);
+
+	if (cnt >= max_retries) {
+		DP_NOTICE(p_hwfn,
+			  "The MFW mailbox is occupied by an uncompleted command. Failed to send command 0x%08x [param 0x%08x].\n",
+			  p_mb_params->cmd, p_mb_params->param);
+		return -EAGAIN;
+	}
 
-		/* Give the FW up to 5 second (500*10ms) */
-	} while ((seq != (*o_mcp_resp & FW_MSG_SEQ_NUMBER_MASK)) &&
-		 (cnt++ < QED_DRV_MB_MAX_RETRIES));
+	/* Send the mailbox command */
+	qed_mcp_reread_offsets(p_hwfn, p_ptt);
+	seq_num = ++p_hwfn->mcp_info->drv_mb_seq;
+	p_cmd_elem = qed_mcp_cmd_add_elem(p_hwfn, p_mb_params, seq_num);
+	if (!p_cmd_elem)
+		goto err;
 
-	DP_VERBOSE(p_hwfn, QED_MSG_SP,
-		   "[after %d ms] read (%x) seq is (%x) from FW MB\n",
-		   cnt * delay, *o_mcp_resp, seq);
-
-	/* Is this a reply to our command? */
-	if (seq == (*o_mcp_resp & FW_MSG_SEQ_NUMBER_MASK)) {
-		*o_mcp_resp &= FW_MSG_CODE_MASK;
-		/* Get the MCP param */
-		*o_mcp_param = DRV_MB_RD(p_hwfn, p_ptt, fw_mb_param);
-	} else {
-		/* FW BUG! */
-		DP_ERR(p_hwfn, "MFW failed to respond [cmd 0x%x param 0x%x]\n",
-		       cmd, param);
-		*o_mcp_resp = 0;
-		rc = -EAGAIN;
+	__qed_mcp_cmd_and_union(p_hwfn, p_ptt, p_mb_params, seq_num);
+	spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+	/* Wait for the MFW response */
+	do {
+		/* Exit the loop if the command is already completed, or if the
+		 * command is completed during this iteration.
+		 * The spinlock stays locked until the list element is removed.
+		 */
+
+		udelay(delay);
+		spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+		if (p_cmd_elem->b_is_completed)
+			break;
+
+		rc = qed_mcp_update_pending_cmd(p_hwfn, p_ptt);
+		if (!rc)
+			break;
+		else if (rc != -EAGAIN)
+			goto err;
+
+		spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+	} while (++cnt < max_retries);
+
+	if (cnt >= max_retries) {
+		DP_NOTICE(p_hwfn,
+			  "The MFW failed to respond to command 0x%08x [param 0x%08x].\n",
+			  p_mb_params->cmd, p_mb_params->param);
+
+		spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
+		qed_mcp_cmd_del_elem(p_hwfn, p_cmd_elem);
+		spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+		return -EAGAIN;
 	}
+
+	qed_mcp_cmd_del_elem(p_hwfn, p_cmd_elem);
+	spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+
+	DP_VERBOSE(p_hwfn,
+		   QED_MSG_SP,
+		   "MFW mailbox: response 0x%08x param 0x%08x [after %d.%03d ms]\n",
+		   p_mb_params->mcp_resp,
+		   p_mb_params->mcp_param,
+		   (cnt * delay) / 1000, (cnt * delay) % 1000);
+
+	/* Clear the sequence number from the MFW response */
+	p_mb_params->mcp_resp &= FW_MSG_CODE_MASK;
+
+	return 0;
+
+err:
+	spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
 	return rc;
 }
 
@@ -354,9 +519,9 @@ static int qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
 				 struct qed_ptt *p_ptt,
 				 struct qed_mcp_mb_params *p_mb_params)
 {
-	u32 union_data_addr;
-
-	int rc;
+	size_t union_data_size = sizeof(union drv_union_data);
+	u32 max_retries = QED_DRV_MB_MAX_RETRIES;
+	u32 delay = CHIP_MCP_RESP_ITER_US;
 
 	/* MCP not initialized */
 	if (!qed_mcp_is_init(p_hwfn)) {
@@ -364,33 +529,17 @@ static int qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
 		return -EBUSY;
 	}
 
-	union_data_addr = p_hwfn->mcp_info->drv_mb_addr +
-			  offsetof(struct public_drv_mb, union_data);
-
-	/* Ensure that only a single thread is accessing the mailbox at a
-	 * certain time.
-	 */
-	rc = qed_mcp_mb_lock(p_hwfn, p_mb_params->cmd);
-	if (rc)
-		return rc;
-
-	if (p_mb_params->p_data_src != NULL)
-		qed_memcpy_to(p_hwfn, p_ptt, union_data_addr,
-			      p_mb_params->p_data_src,
-			      sizeof(*p_mb_params->p_data_src));
-
-	rc = qed_do_mcp_cmd(p_hwfn, p_ptt, p_mb_params->cmd,
-			    p_mb_params->param, &p_mb_params->mcp_resp,
-			    &p_mb_params->mcp_param);
-
-	if (p_mb_params->p_data_dst != NULL)
-		qed_memcpy_from(p_hwfn, p_ptt, p_mb_params->p_data_dst,
-				union_data_addr,
-				sizeof(*p_mb_params->p_data_dst));
-
-	qed_mcp_mb_unlock(p_hwfn, p_mb_params->cmd);
+	if (p_mb_params->data_src_size > union_data_size ||
+	    p_mb_params->data_dst_size > union_data_size) {
+		DP_ERR(p_hwfn,
+		       "The provided size is larger than the union data size [src_size %u, dst_size %u, union_data_size %zu]\n",
+		       p_mb_params->data_src_size,
+		       p_mb_params->data_dst_size, union_data_size);
+		return -EINVAL;
+	}
 
-	return rc;
+	return _qed_mcp_cmd_and_union(p_hwfn, p_ptt, p_mb_params, max_retries,
+				      delay);
 }
 
 int qed_mcp_cmd(struct qed_hwfn *p_hwfn,
@@ -401,11 +550,10 @@ int qed_mcp_cmd(struct qed_hwfn *p_hwfn,
 		u32 *o_mcp_param)
 {
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data data_src;
+	struct mcp_mac wol_mac;
 	int rc;
 
 	memset(&mb_params, 0, sizeof(mb_params));
-	memset(&data_src, 0, sizeof(data_src));
 	mb_params.cmd = cmd;
 	mb_params.param = param;
 
@@ -414,17 +562,18 @@ int qed_mcp_cmd(struct qed_hwfn *p_hwfn,
 	    (p_hwfn->cdev->wol_config == QED_OV_WOL_ENABLED)) {
 		u8 *p_mac = p_hwfn->cdev->wol_mac;
 
-		data_src.wol_mac.mac_upper = p_mac[0] << 8 | p_mac[1];
-		data_src.wol_mac.mac_lower = p_mac[2] << 24 | p_mac[3] << 16 |
-					     p_mac[4] << 8 | p_mac[5];
+		memset(&wol_mac, 0, sizeof(wol_mac));
+		wol_mac.mac_upper = p_mac[0] << 8 | p_mac[1];
+		wol_mac.mac_lower = p_mac[2] << 24 | p_mac[3] << 16 |
+				    p_mac[4] << 8 | p_mac[5];
 
 		DP_VERBOSE(p_hwfn,
 			   (QED_MSG_SP | NETIF_MSG_IFDOWN),
 			   "Setting WoL MAC: %pM --> [%08x,%08x]\n",
-			   p_mac, data_src.wol_mac.mac_upper,
-			   data_src.wol_mac.mac_lower);
+			   p_mac, wol_mac.mac_upper, wol_mac.mac_lower);
 
-		mb_params.p_data_src = &data_src;
+		mb_params.p_data_src = &wol_mac;
+		mb_params.data_src_size = sizeof(wol_mac);
 	}
 
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
@@ -445,13 +594,17 @@ int qed_mcp_nvm_rd_cmd(struct qed_hwfn *p_hwfn,
 		       u32 *o_mcp_param, u32 *o_txn_size, u32 *o_buf)
 {
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data union_data;
+	u8 raw_data[MCP_DRV_NVM_BUF_LEN];
 	int rc;
 
 	memset(&mb_params, 0, sizeof(mb_params));
 	mb_params.cmd = cmd;
 	mb_params.param = param;
-	mb_params.p_data_dst = &union_data;
+	mb_params.p_data_dst = raw_data;
+
+	/* Use the maximal value since the actual one is part of the response */
+	mb_params.data_dst_size = MCP_DRV_NVM_BUF_LEN;
+
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 	if (rc)
 		return rc;
@@ -460,7 +613,7 @@ int qed_mcp_nvm_rd_cmd(struct qed_hwfn *p_hwfn,
 	*o_mcp_param = mb_params.mcp_param;
 
 	*o_txn_size = *o_mcp_param;
-	memcpy(o_buf, &union_data.raw_data, *o_txn_size);
+	memcpy(o_buf, raw_data, *o_txn_size);
 
 	return 0;
 }
@@ -480,6 +633,7 @@ int qed_mcp_load_req(struct qed_hwfn *p_hwfn,
 			  cdev->drv_type;
 	memcpy(&union_data.ver_str, cdev->ver_str, MCP_DRV_VER_STR_SIZE);
 	mb_params.p_data_src = &union_data;
+	mb_params.data_src_size = sizeof(union_data.ver_str);
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 
 	/* if mcp fails to respond we must abort */
@@ -549,7 +703,6 @@ int qed_mcp_ack_vf_flr(struct qed_hwfn *p_hwfn,
 	u32 func_addr = SECTION_ADDR(mfw_func_offsize,
 				     MCP_PF_ID(p_hwfn));
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data union_data;
 	int rc;
 	int i;
 
@@ -560,8 +713,8 @@ int qed_mcp_ack_vf_flr(struct qed_hwfn *p_hwfn,
 
 	memset(&mb_params, 0, sizeof(mb_params));
 	mb_params.cmd = DRV_MSG_CODE_VF_DISABLED_DONE;
-	memcpy(&union_data.ack_vf_disabled, vfs_to_ack, VF_MAX_STATIC / 8);
-	mb_params.p_data_src = &union_data;
+	mb_params.p_data_src = vfs_to_ack;
+	mb_params.data_src_size = VF_MAX_STATIC / 8;
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 	if (rc) {
 		DP_NOTICE(p_hwfn, "Failed to pass ACK for VF flr to MFW\n");
@@ -744,33 +897,31 @@ int qed_mcp_set_link(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt, bool b_up)
 {
 	struct qed_mcp_link_params *params = &p_hwfn->mcp_info->link_input;
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data union_data;
-	struct eth_phy_cfg *phy_cfg;
+	struct eth_phy_cfg phy_cfg;
 	int rc = 0;
 	u32 cmd;
 
 	/* Set the shmem configuration according to params */
-	phy_cfg = &union_data.drv_phy_cfg;
-	memset(phy_cfg, 0, sizeof(*phy_cfg));
+	memset(&phy_cfg, 0, sizeof(phy_cfg));
 	cmd = b_up ? DRV_MSG_CODE_INIT_PHY : DRV_MSG_CODE_LINK_RESET;
 	if (!params->speed.autoneg)
-		phy_cfg->speed = params->speed.forced_speed;
-	phy_cfg->pause |= (params->pause.autoneg) ? ETH_PAUSE_AUTONEG : 0;
-	phy_cfg->pause |= (params->pause.forced_rx) ? ETH_PAUSE_RX : 0;
-	phy_cfg->pause |= (params->pause.forced_tx) ? ETH_PAUSE_TX : 0;
-	phy_cfg->adv_speed = params->speed.advertised_speeds;
-	phy_cfg->loopback_mode = params->loopback_mode;
+		phy_cfg.speed = params->speed.forced_speed;
+	phy_cfg.pause |= (params->pause.autoneg) ? ETH_PAUSE_AUTONEG : 0;
+	phy_cfg.pause |= (params->pause.forced_rx) ? ETH_PAUSE_RX : 0;
+	phy_cfg.pause |= (params->pause.forced_tx) ? ETH_PAUSE_TX : 0;
+	phy_cfg.adv_speed = params->speed.advertised_speeds;
+	phy_cfg.loopback_mode = params->loopback_mode;
 
 	p_hwfn->b_drv_link_init = b_up;
 
 	if (b_up) {
 		DP_VERBOSE(p_hwfn, NETIF_MSG_LINK,
 			   "Configuring Link: Speed 0x%08x, Pause 0x%08x, adv_speed 0x%08x, loopback 0x%08x, features 0x%08x\n",
-			   phy_cfg->speed,
-			   phy_cfg->pause,
-			   phy_cfg->adv_speed,
-			   phy_cfg->loopback_mode,
-			   phy_cfg->feature_config_flags);
+			   phy_cfg.speed,
+			   phy_cfg.pause,
+			   phy_cfg.adv_speed,
+			   phy_cfg.loopback_mode,
+			   phy_cfg.feature_config_flags);
 	} else {
 		DP_VERBOSE(p_hwfn, NETIF_MSG_LINK,
 			   "Resetting link\n");
@@ -778,7 +929,8 @@ int qed_mcp_set_link(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt, bool b_up)
 
 	memset(&mb_params, 0, sizeof(mb_params));
 	mb_params.cmd = cmd;
-	mb_params.p_data_src = &union_data;
+	mb_params.p_data_src = &phy_cfg;
+	mb_params.data_src_size = sizeof(phy_cfg);
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 
 	/* if mcp fails to respond we must abort */
@@ -805,7 +957,6 @@ static void qed_mcp_send_protocol_stats(struct qed_hwfn *p_hwfn,
 	enum qed_mcp_protocol_type stats_type;
 	union qed_mcp_protocol_stats stats;
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data union_data;
 	u32 hsi_param;
 
 	switch (type) {
@@ -835,8 +986,8 @@ static void qed_mcp_send_protocol_stats(struct qed_hwfn *p_hwfn,
 	memset(&mb_params, 0, sizeof(mb_params));
 	mb_params.cmd = DRV_MSG_CODE_GET_STATS;
 	mb_params.param = hsi_param;
-	memcpy(&union_data, &stats, sizeof(stats));
-	mb_params.p_data_src = &union_data;
+	mb_params.p_data_src = &stats;
+	mb_params.data_src_size = sizeof(stats);
 	qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 }
 
@@ -963,7 +1114,7 @@ int qed_mcp_handle_events(struct qed_hwfn *p_hwfn,
 			qed_mcp_update_bw(p_hwfn, p_ptt);
 			break;
 		default:
-			DP_NOTICE(p_hwfn, "Unimplemented MFW message %d\n", i);
+			DP_INFO(p_hwfn, "Unimplemented MFW message %d\n", i);
 			rc = -EINVAL;
 		}
 	}
@@ -1316,24 +1467,23 @@ qed_mcp_send_drv_version(struct qed_hwfn *p_hwfn,
 			 struct qed_ptt *p_ptt,
 			 struct qed_mcp_drv_version *p_ver)
 {
-	struct drv_version_stc *p_drv_version;
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data union_data;
+	struct drv_version_stc drv_version;
 	__be32 val;
 	u32 i;
 	int rc;
 
-	p_drv_version = &union_data.drv_version;
-	p_drv_version->version = p_ver->version;
-
+	memset(&drv_version, 0, sizeof(drv_version));
+	drv_version.version = p_ver->version;
 	for (i = 0; i < (MCP_DRV_VER_STR_SIZE - 4) / sizeof(u32); i++) {
 		val = cpu_to_be32(*((u32 *)&p_ver->name[i * sizeof(u32)]));
-		*(__be32 *)&p_drv_version->name[i * sizeof(u32)] = val;
+		*(__be32 *)&drv_version.name[i * sizeof(u32)] = val;
 	}
 
 	memset(&mb_params, 0, sizeof(mb_params));
 	mb_params.cmd = DRV_MSG_CODE_SET_VERSION;
-	mb_params.p_data_src = &union_data;
+	mb_params.p_data_src = &drv_version;
+	mb_params.data_src_size = sizeof(drv_version);
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 	if (rc)
 		DP_ERR(p_hwfn, "MCP response failure, aborting\n");
@@ -1450,7 +1600,7 @@ int qed_mcp_ov_update_mac(struct qed_hwfn *p_hwfn,
 			  struct qed_ptt *p_ptt, u8 *mac)
 {
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data union_data;
+	u32 mfw_mac[2];
 	int rc;
 
 	memset(&mb_params, 0, sizeof(mb_params));
@@ -1458,8 +1608,17 @@ int qed_mcp_ov_update_mac(struct qed_hwfn *p_hwfn,
 	mb_params.param = DRV_MSG_CODE_VMAC_TYPE_MAC <<
 			  DRV_MSG_CODE_VMAC_TYPE_SHIFT;
 	mb_params.param |= MCP_PF_ID(p_hwfn);
-	ether_addr_copy(&union_data.raw_data[0], mac);
-	mb_params.p_data_src = &union_data;
+
+	/* MCP is BE, and on LE platforms PCI would swap access to SHMEM
+	 * in 32-bit granularity.
+	 * So the MAC has to be set in native order [and not byte order],
+	 * otherwise it would be read incorrectly by MFW after swap.
+	 */
+	mfw_mac[0] = mac[0] << 24 | mac[1] << 16 | mac[2] << 8 | mac[3];
+	mfw_mac[1] = mac[4] << 24 | mac[5] << 16;
+
+	mb_params.p_data_src = (u8 *)mfw_mac;
+	mb_params.data_src_size = 8;
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 	if (rc)
 		DP_ERR(p_hwfn, "Failed to send mac address, rc = %d\n", rc);
@@ -1737,27 +1896,21 @@ int qed_mcp_get_resc_info(struct qed_hwfn *p_hwfn,
 			  u32 *p_mcp_resp, u32 *p_mcp_param)
 {
 	struct qed_mcp_mb_params mb_params;
-	union drv_union_data union_data;
 	int rc;
 
 	memset(&mb_params, 0, sizeof(mb_params));
-	memset(&union_data, 0, sizeof(union_data));
 	mb_params.cmd = DRV_MSG_GET_RESOURCE_ALLOC_MSG;
 	mb_params.param = QED_RESC_ALLOC_VERSION;
 
-	/* Need to have a sufficient large struct, as the cmd_and_union
-	 * is going to do memcpy from and to it.
-	 */
-	memcpy(&union_data.resource, p_resc_info, sizeof(*p_resc_info));
-
-	mb_params.p_data_src = &union_data;
-	mb_params.p_data_dst = &union_data;
+	mb_params.p_data_src = p_resc_info;
+	mb_params.data_src_size = sizeof(*p_resc_info);
+	mb_params.p_data_dst = p_resc_info;
+	mb_params.data_dst_size = sizeof(*p_resc_info);
 	rc = qed_mcp_cmd_and_union(p_hwfn, p_ptt, &mb_params);
 	if (rc)
 		return rc;
 
 	/* Copy the data back */
-	memcpy(p_resc_info, &union_data.resource, sizeof(*p_resc_info));
 	*p_mcp_resp = mb_params.mcp_resp;
 	*p_mcp_param = mb_params.mcp_param;
 
diff --git a/drivers/net/ethernet/qlogic/qed/qed_mcp.h b/drivers/net/ethernet/qlogic/qed/qed_mcp.h
index bdbfd6d4485e..f63693d38934 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_mcp.h
+++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.h
@@ -484,8 +484,13 @@ int qed_mcp_bist_nvm_test_get_image_att(struct qed_hwfn *p_hwfn,
 				  qed_device_num_engines((_p_hwfn)->cdev)))
 
 struct qed_mcp_info {
-	/* Spinlock used for protecting the access to the MFW mailbox */
-	spinlock_t				lock;
+	/* List for mailbox commands which were sent and wait for a response */
+	struct list_head			cmd_list;
+
+	/* Spinlock used for protecting the access to the mailbox commands list
+	 * and the sending of the commands.
+	 */
+	spinlock_t				cmd_lock;
 
 	/* Spinlock used for syncing SW link-changes and link-changes
 	 * originating from attention context.
@@ -505,14 +510,16 @@ struct qed_mcp_info {
 	u8					*mfw_mb_cur;
 	u8					*mfw_mb_shadow;
 	u16					mfw_mb_length;
-	u16					mcp_hist;
+	u32					mcp_hist;
 };
 
 struct qed_mcp_mb_params {
 	u32			cmd;
 	u32			param;
-	union drv_union_data	*p_data_src;
-	union drv_union_data	*p_data_dst;
+	void			*p_data_src;
+	u8			data_src_size;
+	void			*p_data_dst;
+	u8			data_dst_size;
 	u32			mcp_resp;
 	u32			mcp_param;
 };