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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/smc/smc_diag.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Shared Memory Communications over RDMA (SMC-R) and RoCE
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  *
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@@ -20,6 +21,15 @@
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 #include "smc.h"
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 #include "smc_core.h"
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+
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+struct smc_diag_dump_ctx {
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+	int pos[2];
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+};
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+
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+static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
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+{
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+	return (struct smc_diag_dump_ctx *)cb->ctx;
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+}
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 static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
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 {
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@@ -192,13 +202,15 @@
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 }
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 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
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-			       struct netlink_callback *cb)
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+			       struct netlink_callback *cb, int p_type)
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 {
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+	struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
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 	struct net *net = sock_net(skb->sk);
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+	int snum = cb_ctx->pos[p_type];
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 	struct nlattr *bc = NULL;
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 	struct hlist_head *head;
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+	int rc = 0, num = 0;
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 	struct sock *sk;
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-	int rc = 0;
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 	read_lock(&prot->h.smc_hash->lock);
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 	head = &prot->h.smc_hash->ht;
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@@ -208,13 +220,18 @@
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 	sk_for_each(sk, head) {
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 		if (!net_eq(sock_net(sk), net))
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 			continue;
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+		if (num < snum)
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+			goto next;
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 		rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
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-		if (rc)
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-			break;
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+		if (rc < 0)
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+			goto out;
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+next:
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+		num++;
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 	}
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 out:
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 	read_unlock(&prot->h.smc_hash->lock);
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+	cb_ctx->pos[p_type] = num;
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 	return rc;
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 }
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@@ -222,10 +239,10 @@
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 {
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 	int rc = 0;
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-	rc = smc_diag_dump_proto(&smc_proto, skb, cb);
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+	rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
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 	if (!rc)
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-		rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
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-	return rc;
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+		smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
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+	return skb->len;
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 }
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 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)