bnxt_en: Add support for new backing store query firmware API

Use the new v2 firmware API if supported by the firmware.  We now have the
infrastructure to support the v2 API.

Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231120234405.194542-8-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -7208,6 +7208,72 @@ static int bnxt_alloc_all_ctx_pg_info(struct bnxt *bp, int ctx_max)
 	return 0;
 }
 
+#define BNXT_CTX_INIT_VALID(flags)	\
+	(!!((flags) &			\
+	    FUNC_BACKING_STORE_QCAPS_V2_RESP_FLAGS_ENABLE_CTX_KIND_INIT))
+
+static int bnxt_hwrm_func_backing_store_qcaps_v2(struct bnxt *bp)
+{
+	struct hwrm_func_backing_store_qcaps_v2_output *resp;
+	struct hwrm_func_backing_store_qcaps_v2_input *req;
+	u16 last_valid_type = BNXT_CTX_INV;
+	struct bnxt_ctx_mem_info *ctx;
+	u16 type;
+	int rc;
+
+	rc = hwrm_req_init(bp, req, HWRM_FUNC_BACKING_STORE_QCAPS_V2);
+	if (rc)
+		return rc;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+	bp->ctx = ctx;
+
+	resp = hwrm_req_hold(bp, req);
+
+	for (type = 0; type < BNXT_CTX_V2_MAX; ) {
+		struct bnxt_ctx_mem_type *ctxm = &ctx->ctx_arr[type];
+		u8 init_val, init_off, i;
+		__le32 *p;
+		u32 flags;
+
+		req->type = cpu_to_le16(type);
+		rc = hwrm_req_send(bp, req);
+		if (rc)
+			goto ctx_done;
+		flags = le32_to_cpu(resp->flags);
+		type = le16_to_cpu(resp->next_valid_type);
+		if (!(flags & FUNC_BACKING_STORE_QCAPS_V2_RESP_FLAGS_TYPE_VALID))
+			continue;
+
+		ctxm->type = le16_to_cpu(resp->type);
+		last_valid_type = ctxm->type;
+		ctxm->entry_size = le16_to_cpu(resp->entry_size);
+		ctxm->flags = flags;
+		ctxm->instance_bmap = le32_to_cpu(resp->instance_bit_map);
+		ctxm->entry_multiple = resp->entry_multiple;
+		ctxm->max_entries = le32_to_cpu(resp->max_num_entries);
+		ctxm->min_entries = le32_to_cpu(resp->min_num_entries);
+		init_val = resp->ctx_init_value;
+		init_off = resp->ctx_init_offset;
+		bnxt_init_ctx_initializer(ctxm, init_val, init_off,
+					  BNXT_CTX_INIT_VALID(flags));
+		ctxm->split_entry_cnt = min_t(u8, resp->subtype_valid_cnt,
+					      BNXT_MAX_SPLIT_ENTRY);
+		for (i = 0, p = &resp->split_entry_0; i < ctxm->split_entry_cnt;
+		     i++, p++)
+			ctxm->split[i] = le32_to_cpu(*p);
+	}
+	if (last_valid_type < BNXT_CTX_V2_MAX)
+		ctx->ctx_arr[last_valid_type].last = true;
+	rc = bnxt_alloc_all_ctx_pg_info(bp, BNXT_CTX_V2_MAX);
+
+ctx_done:
+	hwrm_req_drop(bp, req);
+	return rc;
+}
+
 static int bnxt_hwrm_func_backing_store_qcaps(struct bnxt *bp)
 {
 	struct hwrm_func_backing_store_qcaps_output *resp;
@@ -7217,6 +7283,9 @@ static int bnxt_hwrm_func_backing_store_qcaps(struct bnxt *bp)
 	if (bp->hwrm_spec_code < 0x10902 || BNXT_VF(bp) || bp->ctx)
 		return 0;
 
+	if (bp->fw_cap & BNXT_FW_CAP_BACKING_STORE_V2)
+		return bnxt_hwrm_func_backing_store_qcaps_v2(bp);
+
 	rc = hwrm_req_init(bp, req, HWRM_FUNC_BACKING_STORE_QCAPS);
 	if (rc)
 		return rc;
@@ -7229,13 +7298,15 @@ static int bnxt_hwrm_func_backing_store_qcaps(struct bnxt *bp)
 		u8 init_val, init_idx = 0;
 		u16 init_mask;
 
-		ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+		ctx = bp->ctx;
 		if (!ctx) {
-			rc = -ENOMEM;
-			goto ctx_err;
+			ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+			if (!ctx) {
+				rc = -ENOMEM;
+				goto ctx_err;
+			}
+			bp->ctx = ctx;
 		}
-		bp->ctx = ctx;
-
 		init_val = resp->ctx_kind_initializer;
 		init_mask = le16_to_cpu(resp->ctx_init_mask);
 
@@ -7607,7 +7678,7 @@ void bnxt_free_ctx_mem(struct bnxt *bp)
 	if (!ctx)
 		return;
 
-	for (type = 0; type < BNXT_CTX_MAX; type++) {
+	for (type = 0; type < BNXT_CTX_V2_MAX; type++) {
 		struct bnxt_ctx_mem_type *ctxm = &ctx->ctx_arr[type];
 		struct bnxt_ctx_pg_info *ctx_pg = ctxm->pg_info;
 		int i, n = 1;
@@ -7914,6 +7985,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->fw_cap |= BNXT_FW_CAP_HOT_RESET_IF;
 	if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_FW_LIVEPATCH_SUPPORTED))
 		bp->fw_cap |= BNXT_FW_CAP_LIVEPATCH;
+	if (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_BS_V2_SUPPORTED)
+		bp->fw_cap |= BNXT_FW_CAP_BACKING_STORE_V2;
 
 	flags_ext2 = le32_to_cpu(resp->flags_ext2);
 	if (flags_ext2 & FUNC_QCAPS_RESP_FLAGS_EXT2_RX_ALL_PKTS_TIMESTAMPS_SUPPORTED)

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1608,7 +1608,7 @@ struct bnxt_ctx_mem_info {
 
 	u32	flags;
 	#define BNXT_CTX_FLAG_INITED	0x01
-	struct bnxt_ctx_mem_type	ctx_arr[BNXT_CTX_MAX];
+	struct bnxt_ctx_mem_type	ctx_arr[BNXT_CTX_V2_MAX];
 };
 
 enum bnxt_health_severity {
@@ -2070,6 +2070,7 @@ struct bnxt {
 	#define BNXT_FW_CAP_THRESHOLD_TEMP_SUPPORTED	BIT_ULL(33)
 	#define BNXT_FW_CAP_DFLT_VLAN_TPID_PCP		BIT_ULL(34)
 	#define BNXT_FW_CAP_PRE_RESV_VNICS		BIT_ULL(35)
+	#define BNXT_FW_CAP_BACKING_STORE_V2		BIT_ULL(36)
 
 	u32			fw_dbg_cap;