add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/net/sched/cls_u32.c
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@@ -716,11 +716,17 @@
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 			 struct nlattr *est, bool ovr,
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 			 struct netlink_ext_ack *extack)
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 {
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-	int err;
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+	int err, ifindex = -1;
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 	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, true, extack);
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 	if (err < 0)
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 		return err;
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+
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+	if (tb[TCA_U32_INDEV]) {
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+		ifindex = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
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+		if (ifindex < 0)
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+			return -EINVAL;
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+	}
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 	if (tb[TCA_U32_LINK]) {
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 		u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
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@@ -756,13 +762,9 @@
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 		tcf_bind_filter(tp, &n->res, base);
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 	}
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-	if (tb[TCA_U32_INDEV]) {
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-		int ret;
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-		ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
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-		if (ret < 0)
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-			return -EINVAL;
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-		n->ifindex = ret;
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-	}
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+	if (ifindex >= 0)
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+		n->ifindex = ifindex;
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+
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 	return 0;
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 }
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@@ -810,7 +812,6 @@
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 	new->ifindex = n->ifindex;
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 	new->fshift = n->fshift;
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-	new->res = n->res;
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 	new->flags = n->flags;
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 	RCU_INIT_POINTER(new->ht_down, ht);
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..
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@@ -997,18 +998,62 @@
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 		return -EINVAL;
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 	}
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+	/* At this point, we need to derive the new handle that will be used to
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+	 * uniquely map the identity of this table match entry. The
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+	 * identity of the entry that we need to construct is 32 bits made of:
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+	 *     htid(12b):bucketid(8b):node/entryid(12b)
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+	 *
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+	 * At this point _we have the table(ht)_ in which we will insert this
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+	 * entry. We carry the table's id in variable "htid".
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+	 * Note that earlier code picked the ht selection either by a) the user
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+	 * providing the htid specified via TCA_U32_HASH attribute or b) when
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+	 * no such attribute is passed then the root ht, is default to at ID
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+	 * 0x[800][00][000]. Rule: the root table has a single bucket with ID 0.
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+	 * If OTOH the user passed us the htid, they may also pass a bucketid of
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+	 * choice. 0 is fine. For example a user htid is 0x[600][01][000] it is
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+	 * indicating hash bucketid of 1. Rule: the entry/node ID _cannot_ be
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+	 * passed via the htid, so even if it was non-zero it will be ignored.
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+	 *
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+	 * We may also have a handle, if the user passed one. The handle also
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+	 * carries the same addressing of htid(12b):bucketid(8b):node/entryid(12b).
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+	 * Rule: the bucketid on the handle is ignored even if one was passed;
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+	 * rather the value on "htid" is always assumed to be the bucketid.
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+	 */
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 	if (handle) {
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+		/* Rule: The htid from handle and tableid from htid must match */
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 		if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) {
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 			NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch");
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 			return -EINVAL;
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 		}
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-		handle = htid | TC_U32_NODE(handle);
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-		err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle,
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-				    GFP_KERNEL);
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-		if (err)
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-			return err;
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-	} else
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+		/* Ok, so far we have a valid htid(12b):bucketid(8b) but we
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+		 * need to finalize the table entry identification with the last
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+		 * part - the node/entryid(12b)). Rule: Nodeid _cannot be 0_ for
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+		 * entries. Rule: nodeid of 0 is reserved only for tables(see
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+		 * earlier code which processes TC_U32_DIVISOR attribute).
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+		 * Rule: The nodeid can only be derived from the handle (and not
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+		 * htid).
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+		 * Rule: if the handle specified zero for the node id example
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+		 * 0x60000000, then pick a new nodeid from the pool of IDs
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+		 * this hash table has been allocating from.
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+		 * If OTOH it is specified (i.e for example the user passed a
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+		 * handle such as 0x60000123), then we use it generate our final
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+		 * handle which is used to uniquely identify the match entry.
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+		 */
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+		if (!TC_U32_NODE(handle)) {
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+			handle = gen_new_kid(ht, htid);
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+		} else {
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+			handle = htid | TC_U32_NODE(handle);
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+			err = idr_alloc_u32(&ht->handle_idr, NULL, &handle,
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+					    handle, GFP_KERNEL);
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+			if (err)
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+				return err;
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+		}
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+	} else {
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+		/* The user did not give us a handle; lets just generate one
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+		 * from the table's pool of nodeids.
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+		 */
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 		handle = gen_new_kid(ht, htid);
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+	}
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 	if (tb[TCA_U32_SEL] == NULL) {
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 		NL_SET_ERR_MSG_MOD(extack, "Selector not specified");