qed: Remove assumption on SB order in IGU

Current code assumes there's a known layout for SBs in the IGU,
where all the SBs of a single entity would be laid in consecutive
order of vectors.

While the assumption is still kept by management firmware, we already
have the necessary information to eliminate it, so no reason to keep
it in code.
Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_int.c

@@ -1732,8 +1732,16 @@ void qed_int_igu_init_pure_rt_single(struct qed_hwfn *p_hwfn,
 				     struct qed_ptt *p_ptt,
 				     u16 igu_sb_id, u16 opaque, bool b_set)
 {
+	struct qed_igu_block *p_block;
 	int pi, i;
 
+	p_block = &p_hwfn->hw_info.p_igu_info->entry[igu_sb_id];
+	DP_VERBOSE(p_hwfn, NETIF_MSG_INTR,
+		   "Cleaning SB [%04x]: func_id= %d is_pf = %d vector_num = 0x%0x\n",
+		   igu_sb_id,
+		   p_block->function_id,
+		   p_block->is_pf, p_block->vector_number);
+
 	/* Set */
 	if (b_set)
 		qed_int_igu_cleanup_sb(p_hwfn, p_ptt, igu_sb_id, 1, opaque);
@@ -1768,33 +1776,35 @@ void qed_int_igu_init_pure_rt(struct qed_hwfn *p_hwfn,
 			      struct qed_ptt *p_ptt,
 			      bool b_set, bool b_slowpath)
 {
-	u32 igu_base_sb = p_hwfn->hw_info.p_igu_info->igu_base_sb;
-	u32 igu_sb_cnt = p_hwfn->hw_info.p_igu_info->usage.cnt;
-	u32 igu_sb_id = 0, val = 0;
+	struct qed_igu_info *p_info = p_hwfn->hw_info.p_igu_info;
+	struct qed_igu_block *p_block;
+	u16 igu_sb_id = 0;
+	u32 val = 0;
 
 	val = qed_rd(p_hwfn, p_ptt, IGU_REG_BLOCK_CONFIGURATION);
 	val |= IGU_REG_BLOCK_CONFIGURATION_VF_CLEANUP_EN;
 	val &= ~IGU_REG_BLOCK_CONFIGURATION_PXP_TPH_INTERFACE_EN;
 	qed_wr(p_hwfn, p_ptt, IGU_REG_BLOCK_CONFIGURATION, val);
 
-	DP_VERBOSE(p_hwfn, NETIF_MSG_INTR,
-		   "IGU cleaning SBs [%d,...,%d]\n",
-		   igu_base_sb, igu_base_sb + igu_sb_cnt - 1);
+	for (igu_sb_id = 0;
+	     igu_sb_id < QED_MAPPING_MEMORY_SIZE(p_hwfn->cdev); igu_sb_id++) {
+		p_block = &p_info->entry[igu_sb_id];
+
+		if (!(p_block->status & QED_IGU_STATUS_VALID) ||
+		    !p_block->is_pf ||
+		    (p_block->status & QED_IGU_STATUS_DSB))
+			continue;
 
-	for (igu_sb_id = igu_base_sb; igu_sb_id < igu_base_sb + igu_sb_cnt;
-	     igu_sb_id++)
 		qed_int_igu_init_pure_rt_single(p_hwfn, p_ptt, igu_sb_id,
 						p_hwfn->hw_info.opaque_fid,
 						b_set);
+	}
 
-	if (!b_slowpath)
-		return;
-
-	igu_sb_id = p_hwfn->hw_info.p_igu_info->igu_dsb_id;
-	DP_VERBOSE(p_hwfn, NETIF_MSG_INTR,
-		   "IGU cleaning slowpath SB [%d]\n", igu_sb_id);
-	qed_int_igu_init_pure_rt_single(p_hwfn, p_ptt, igu_sb_id,
-					p_hwfn->hw_info.opaque_fid, b_set);
+	if (b_slowpath)
+		qed_int_igu_init_pure_rt_single(p_hwfn, p_ptt,
+						p_info->igu_dsb_id,
+						p_hwfn->hw_info.opaque_fid,
+						b_set);
 }
 
 static void qed_int_igu_read_cam_block(struct qed_hwfn *p_hwfn,
@@ -1810,6 +1820,7 @@ static void qed_int_igu_read_cam_block(struct qed_hwfn *p_hwfn,
 	p_block->function_id = GET_FIELD(val, IGU_MAPPING_LINE_FUNCTION_NUMBER);
 	p_block->is_pf = GET_FIELD(val, IGU_MAPPING_LINE_PF_VALID);
 	p_block->vector_number = GET_FIELD(val, IGU_MAPPING_LINE_VECTOR_NUMBER);
+	p_block->igu_sb_id = igu_sb_id;
 }
 
 int qed_int_igu_read_cam(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
@@ -1825,10 +1836,6 @@ int qed_int_igu_read_cam(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 
 	p_igu_info = p_hwfn->hw_info.p_igu_info;
 
-       /* Initialize base sb / sb cnt for PFs and VFs */
-	p_igu_info->igu_base_sb = 0xffff;
-	p_igu_info->igu_base_sb_iov = 0xffff;
-
 	/* Distinguish between existent and non-existent default SB */
 	p_igu_info->igu_dsb_id = QED_SB_INVALID_IDX;
 
@@ -1852,11 +1859,8 @@ int qed_int_igu_read_cam(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 					  QED_IGU_STATUS_VALID |
 					  QED_IGU_STATUS_FREE;
 
-			if (p_igu_info->igu_dsb_id != QED_SB_INVALID_IDX) {
-				if (p_igu_info->igu_base_sb == 0xffff)
-					p_igu_info->igu_base_sb = igu_sb_id;
+			if (p_igu_info->igu_dsb_id != QED_SB_INVALID_IDX)
 				p_igu_info->usage.cnt++;
-			}
 		} else if (!(p_block->is_pf) &&
 			   (p_block->function_id >= min_vf) &&
 			   (p_block->function_id < max_vf)) {
@@ -1864,9 +1868,8 @@ int qed_int_igu_read_cam(struct qed_hwfn *p_hwfn, struct qed_ptt *p_ptt)
 			p_block->status = QED_IGU_STATUS_VALID |
 					  QED_IGU_STATUS_FREE;
 
-			if (p_igu_info->igu_base_sb_iov == 0xffff)
-				p_igu_info->igu_base_sb_iov = igu_sb_id;
-			p_igu_info->usage.iov_cnt++;
+			if (p_igu_info->igu_dsb_id != QED_SB_INVALID_IDX)
+				p_igu_info->usage.iov_cnt++;
 		}
 
 		/* Mark the First entry belonging to the PF or its VFs
@@ -2006,28 +2009,6 @@ void qed_int_get_num_sbs(struct qed_hwfn	*p_hwfn,
 	memcpy(p_sb_cnt_info, &info->usage, sizeof(*p_sb_cnt_info));
 }
 
-u16 qed_int_queue_id_from_sb_id(struct qed_hwfn *p_hwfn, u16 sb_id)
-{
-	struct qed_igu_info *p_info = p_hwfn->hw_info.p_igu_info;
-
-	/* Determine origin of SB id */
-	if ((sb_id >= p_info->igu_base_sb) &&
-	    (sb_id < p_info->igu_base_sb + p_info->usage.cnt)) {
-		return sb_id - p_info->igu_base_sb;
-	} else if ((sb_id >= p_info->igu_base_sb_iov) &&
-		   (sb_id < p_info->igu_base_sb_iov + p_info->usage.iov_cnt)) {
-		/* We want the first VF queue to be adjacent to the
-		 * last PF queue. Since L2 queues can be partial to
-		 * SBs, we'll use the feature instead.
-		 */
-		return sb_id - p_info->igu_base_sb_iov +
-		       FEAT_NUM(p_hwfn, QED_PF_L2_QUE);
-	} else {
-		DP_NOTICE(p_hwfn, "SB %d not in range for function\n", sb_id);
-		return 0;
-	}
-}
-
 void qed_int_disable_post_isr_release(struct qed_dev *cdev)
 {
 	int i;

drivers/net/ethernet/qlogic/qed/qed_int.h

@@ -211,14 +211,15 @@ struct qed_igu_block {
 	u8	vector_number;
 	u8	function_id;
 	u8	is_pf;
+
+	/* Index inside IGU [meant for back reference] */
+	u16	igu_sb_id;
 };
 
 struct qed_igu_info {
 	struct qed_igu_block entry[MAX_TOT_SB_PER_PATH];
 	u16 igu_dsb_id;
 
-	u16 igu_base_sb;
-	u16 igu_base_sb_iov;
 	struct qed_sb_cnt_info usage;
 
 };
@@ -357,16 +358,6 @@ void qed_int_free(struct qed_hwfn *p_hwfn);
 void qed_int_setup(struct qed_hwfn *p_hwfn,
 		   struct qed_ptt *p_ptt);
 
-/**
- * @brief - Returns an Rx queue index appropriate for usage with given SB.
- *
- * @param p_hwfn
- * @param sb_id - absolute index of SB
- *
- * @return index of Rx queue
- */
-u16 qed_int_queue_id_from_sb_id(struct qed_hwfn *p_hwfn, u16 sb_id);
-
 /**
  * @brief - Enable Interrupt & Attention for hw function
  *