qed*: Handle-based L2-queues.

The driver needs to maintain several FW/HW-indices for each one of
its queues. Currently, that mapping is done by the QED where it uses
an rx/tx array of so-called hw-cids, populating them whenever a new
queue is opened and clearing them upon destruction of said queues.

This maintenance is far from ideal - there's no real reason why
QED needs to maintain such a data-structure. It becomes even worse
when considering the fact that the PF's queues and its child VFs' queues
are all mapped into the same data-structure.
As a by-product, the set of parameters an interface needs to supply for
queue APIs is non-trivial, and some of the variables in the API
structures have different meaning depending on their exact place
in the configuration flow.

This patch re-organizes the way L2 queues are configured and maintained.
In short:
  - Required parameters for queue init are now well-defined.
  - Qed would allocate a queue-cid based on parameters.
    Upon initialization success, it would return a handle to caller.
  - Queue-handle would be maintained by entity requesting queue-init,
    not necessarily qed.
  - All further queue-APIs [update, destroy] would use the opaque
    handle as reference for the queue instead of various indices.

The possible owners of such handles:
  - PF queues [qede] - complete handles based on provided configuration.
  - VF queues [qede] - fw-context-less handles, containing only relative
    information; Only the PF-side would need the absolute indices
    for configuration, so they're omitted here.
  - VF queues [qed, PF-side] - complete handles based on VF initialization.

Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 44 insertions, 46 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_vf.c b/drivers/net/ethernet/qlogic/qed/qed_vf.c
index 3c0633642f4c..60b31a8ede73 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_vf.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_vf.c
@@ -388,18 +388,18 @@ free_p_iov:
 #define MSTORM_QZONE_START(dev)   (TSTORM_QZONE_START +	\
 				   (TSTORM_QZONE_SIZE * NUM_OF_L2_QUEUES(dev)))
 
-int qed_vf_pf_rxq_start(struct qed_hwfn *p_hwfn,
-			u8 rx_qid,
-			u16 sb,
-			u8 sb_index,
-			u16 bd_max_bytes,
-			dma_addr_t bd_chain_phys_addr,
-			dma_addr_t cqe_pbl_addr,
-			u16 cqe_pbl_size, void __iomem **pp_prod)
+int
+qed_vf_pf_rxq_start(struct qed_hwfn *p_hwfn,
+		    struct qed_queue_cid *p_cid,
+		    u16 bd_max_bytes,
+		    dma_addr_t bd_chain_phys_addr,
+		    dma_addr_t cqe_pbl_addr,
+		    u16 cqe_pbl_size, void __iomem **pp_prod)
 {
 	struct qed_vf_iov *p_iov = p_hwfn->vf_iov_info;
 	struct pfvf_start_queue_resp_tlv *resp;
 	struct vfpf_start_rxq_tlv *req;
+	u8 rx_qid = p_cid->rel.queue_id;
 	int rc;
 
 	/* clear mailbox and prep first tlv */
@@ -409,21 +409,22 @@ int qed_vf_pf_rxq_start(struct qed_hwfn *p_hwfn,
 	req->cqe_pbl_addr = cqe_pbl_addr;
 	req->cqe_pbl_size = cqe_pbl_size;
 	req->rxq_addr = bd_chain_phys_addr;
-	req->hw_sb = sb;
-	req->sb_index = sb_index;
+	req->hw_sb = p_cid->rel.sb;
+	req->sb_index = p_cid->rel.sb_idx;
 	req->bd_max_bytes = bd_max_bytes;
 	req->stat_id = -1;
 
 	/* If PF is legacy, we'll need to calculate producers ourselves
 	 * as well as clean them.
 	 */
-	if (pp_prod && p_iov->b_pre_fp_hsi) {
+	if (p_iov->b_pre_fp_hsi) {
 		u8 hw_qid = p_iov->acquire_resp.resc.hw_qid[rx_qid];
 		u32 init_prod_val = 0;
 
-		*pp_prod = (u8 __iomem *)p_hwfn->regview +
-					 MSTORM_QZONE_START(p_hwfn->cdev) +
-					 hw_qid * MSTORM_QZONE_SIZE;
+		*pp_prod = (u8 __iomem *)
+		    p_hwfn->regview +
+		    MSTORM_QZONE_START(p_hwfn->cdev) +
+		    hw_qid * MSTORM_QZONE_SIZE;
 
 		/* Init the rcq, rx bd and rx sge (if valid) producers to 0 */
 		__internal_ram_wr(p_hwfn, *pp_prod, sizeof(u32),
@@ -444,7 +445,7 @@ int qed_vf_pf_rxq_start(struct qed_hwfn *p_hwfn,
 	}
 
 	/* Learn the address of the producer from the response */
-	if (pp_prod && !p_iov->b_pre_fp_hsi) {
+	if (!p_iov->b_pre_fp_hsi) {
 		u32 init_prod_val = 0;
 
 		*pp_prod = (u8 __iomem *)p_hwfn->regview + resp->offset;
@@ -462,7 +463,8 @@ exit:
 	return rc;
 }
 
-int qed_vf_pf_rxq_stop(struct qed_hwfn *p_hwfn, u16 rx_qid, bool cqe_completion)
+int qed_vf_pf_rxq_stop(struct qed_hwfn *p_hwfn,
+		       struct qed_queue_cid *p_cid, bool cqe_completion)
 {
 	struct qed_vf_iov *p_iov = p_hwfn->vf_iov_info;
 	struct vfpf_stop_rxqs_tlv *req;
@@ -472,7 +474,7 @@ int qed_vf_pf_rxq_stop(struct qed_hwfn *p_hwfn, u16 rx_qid, bool cqe_completion)
 	/* clear mailbox and prep first tlv */
 	req = qed_vf_pf_prep(p_hwfn, CHANNEL_TLV_STOP_RXQS, sizeof(*req));
 
-	req->rx_qid = rx_qid;
+	req->rx_qid = p_cid->rel.queue_id;
 	req->num_rxqs = 1;
 	req->cqe_completion = cqe_completion;
 
@@ -496,28 +498,28 @@ exit:
 	return rc;
 }
 
-int qed_vf_pf_txq_start(struct qed_hwfn *p_hwfn,
-			u16 tx_queue_id,
-			u16 sb,
-			u8 sb_index,
-			dma_addr_t pbl_addr,
-			u16 pbl_size, void __iomem **pp_doorbell)
+int
+qed_vf_pf_txq_start(struct qed_hwfn *p_hwfn,
+		    struct qed_queue_cid *p_cid,
+		    dma_addr_t pbl_addr,
+		    u16 pbl_size, void __iomem **pp_doorbell)
 {
 	struct qed_vf_iov *p_iov = p_hwfn->vf_iov_info;
 	struct pfvf_start_queue_resp_tlv *resp;
 	struct vfpf_start_txq_tlv *req;
+	u16 qid = p_cid->rel.queue_id;
 	int rc;
 
 	/* clear mailbox and prep first tlv */
 	req = qed_vf_pf_prep(p_hwfn, CHANNEL_TLV_START_TXQ, sizeof(*req));
 
-	req->tx_qid = tx_queue_id;
+	req->tx_qid = qid;
 
 	/* Tx */
 	req->pbl_addr = pbl_addr;
 	req->pbl_size = pbl_size;
-	req->hw_sb = sb;
-	req->sb_index = sb_index;
+	req->hw_sb = p_cid->rel.sb;
+	req->sb_index = p_cid->rel.sb_idx;
 
 	/* add list termination tlv */
 	qed_add_tlv(p_hwfn, &p_iov->offset,
@@ -533,33 +535,29 @@ int qed_vf_pf_txq_start(struct qed_hwfn *p_hwfn,
 		goto exit;
 	}
 
-	if (pp_doorbell) {
-		/* Modern PFs provide the actual offsets, while legacy
-		 * provided only the queue id.
-		 */
-		if (!p_iov->b_pre_fp_hsi) {
-			*pp_doorbell = (u8 __iomem *)p_hwfn->doorbells +
-						     resp->offset;
-		} else {
-			u8 cid = p_iov->acquire_resp.resc.cid[tx_queue_id];
-			u32 db_addr;
-
-			db_addr = qed_db_addr_vf(cid, DQ_DEMS_LEGACY);
-			*pp_doorbell = (u8 __iomem *)p_hwfn->doorbells +
-						     db_addr;
-		}
+	/* Modern PFs provide the actual offsets, while legacy
+	 * provided only the queue id.
+	 */
+	if (!p_iov->b_pre_fp_hsi) {
+		*pp_doorbell = (u8 __iomem *)p_hwfn->doorbells + resp->offset;
+	} else {
+		u8 cid = p_iov->acquire_resp.resc.cid[qid];
 
-		DP_VERBOSE(p_hwfn, QED_MSG_IOV,
-			   "Txq[0x%02x]: doorbell at %p [offset 0x%08x]\n",
-			   tx_queue_id, *pp_doorbell, resp->offset);
+		*pp_doorbell = (u8 __iomem *)p_hwfn->doorbells +
+					     qed_db_addr_vf(cid,
+							    DQ_DEMS_LEGACY);
 	}
+
+	DP_VERBOSE(p_hwfn, QED_MSG_IOV,
+		   "Txq[0x%02x]: doorbell at %p [offset 0x%08x]\n",
+		   qid, *pp_doorbell, resp->offset);
 exit:
 	qed_vf_pf_req_end(p_hwfn, rc);
 
 	return rc;
 }
 
-int qed_vf_pf_txq_stop(struct qed_hwfn *p_hwfn, u16 tx_qid)
+int qed_vf_pf_txq_stop(struct qed_hwfn *p_hwfn, struct qed_queue_cid *p_cid)
 {
 	struct qed_vf_iov *p_iov = p_hwfn->vf_iov_info;
 	struct vfpf_stop_txqs_tlv *req;
@@ -569,7 +567,7 @@ int qed_vf_pf_txq_stop(struct qed_hwfn *p_hwfn, u16 tx_qid)
 	/* clear mailbox and prep first tlv */
 	req = qed_vf_pf_prep(p_hwfn, CHANNEL_TLV_STOP_TXQS, sizeof(*req));
 
-	req->tx_qid = tx_qid;
+	req->tx_qid = p_cid->rel.queue_id;
 	req->num_txqs = 1;
 
 	/* add list termination tlv */