zebra: dataplane context reset and init apis

Add a public reset api, so a context can be reset and reused;
add apis to init a context for a route or mac update.

Signed-off-by: Mark Stapp <mjs@voltanet.io>

zebra/zebra_dplane.c

@@ -401,7 +401,7 @@ static enum zebra_dplane_result pw_update_internal(struct zebra_pw *pw,
 static enum zebra_dplane_result intf_addr_update_internal(
 	const struct interface *ifp, const struct connected *ifc,
 	enum dplane_op_e op);
-static enum zebra_dplane_result mac_update_internal(
+static enum zebra_dplane_result mac_update_common(
 	enum dplane_op_e op, const struct interface *ifp,
 	const struct interface *br_ifp,
 	vlanid_t vid, const struct ethaddr *mac,
@@ -445,23 +445,15 @@ void dplane_enable_sys_route_notifs(void)
 }
 
 /*
- * Free a dataplane results context.
+ * Clean up dependent/internal allocations inside a context object
  */
-static void dplane_ctx_free(struct zebra_dplane_ctx **pctx)
+static void dplane_ctx_free_internal(struct zebra_dplane_ctx *ctx)
 {
-	if (pctx == NULL)
-		return;
-
-	DPLANE_CTX_VALID(*pctx);
-
-	/* TODO -- just freeing memory, but would like to maintain
-	 * a pool
-	 */
-
-	/* Some internal allocations may need to be freed, depending on
+	/*
+	 * Some internal allocations may need to be freed, depending on
 	 * the type of info captured in the ctx.
 	 */
-	switch ((*pctx)->zd_op) {
+	switch (ctx->zd_op) {
 	case DPLANE_OP_ROUTE_INSTALL:
 	case DPLANE_OP_ROUTE_UPDATE:
 	case DPLANE_OP_ROUTE_DELETE:
@@ -470,45 +462,45 @@ static void dplane_ctx_free(struct zebra_dplane_ctx **pctx)
 	case DPLANE_OP_ROUTE_NOTIFY:
 
 		/* Free allocated nexthops */
-		if ((*pctx)->u.rinfo.zd_ng.nexthop) {
+		if (ctx->u.rinfo.zd_ng.nexthop) {
 			/* This deals with recursive nexthops too */
-			nexthops_free((*pctx)->u.rinfo.zd_ng.nexthop);
+			nexthops_free(ctx->u.rinfo.zd_ng.nexthop);
 
-			(*pctx)->u.rinfo.zd_ng.nexthop = NULL;
+			ctx->u.rinfo.zd_ng.nexthop = NULL;
 		}
 
 		/* Free backup info also (if present) */
-		if ((*pctx)->u.rinfo.backup_ng.nexthop) {
+		if (ctx->u.rinfo.backup_ng.nexthop) {
 			/* This deals with recursive nexthops too */
-			nexthops_free((*pctx)->u.rinfo.backup_ng.nexthop);
+			nexthops_free(ctx->u.rinfo.backup_ng.nexthop);
 
-			(*pctx)->u.rinfo.backup_ng.nexthop = NULL;
+			ctx->u.rinfo.backup_ng.nexthop = NULL;
 		}
 
-		if ((*pctx)->u.rinfo.zd_old_ng.nexthop) {
+		if (ctx->u.rinfo.zd_old_ng.nexthop) {
 			/* This deals with recursive nexthops too */
-			nexthops_free((*pctx)->u.rinfo.zd_old_ng.nexthop);
+			nexthops_free(ctx->u.rinfo.zd_old_ng.nexthop);
 
-			(*pctx)->u.rinfo.zd_old_ng.nexthop = NULL;
+			ctx->u.rinfo.zd_old_ng.nexthop = NULL;
 		}
 
-		if ((*pctx)->u.rinfo.old_backup_ng.nexthop) {
+		if (ctx->u.rinfo.old_backup_ng.nexthop) {
 			/* This deals with recursive nexthops too */
-			nexthops_free((*pctx)->u.rinfo.old_backup_ng.nexthop);
+			nexthops_free(ctx->u.rinfo.old_backup_ng.nexthop);
 
-			(*pctx)->u.rinfo.old_backup_ng.nexthop = NULL;
+			ctx->u.rinfo.old_backup_ng.nexthop = NULL;
 		}
 
 		break;
 
 	case DPLANE_OP_NH_INSTALL:
 	case DPLANE_OP_NH_UPDATE:
 	case DPLANE_OP_NH_DELETE: {
-		if ((*pctx)->u.rinfo.nhe.ng.nexthop) {
+		if (ctx->u.rinfo.nhe.ng.nexthop) {
 			/* This deals with recursive nexthops too */
-			nexthops_free((*pctx)->u.rinfo.nhe.ng.nexthop);
+			nexthops_free(ctx->u.rinfo.nhe.ng.nexthop);
 
-			(*pctx)->u.rinfo.nhe.ng.nexthop = NULL;
+			ctx->u.rinfo.nhe.ng.nexthop = NULL;
 		}
 		break;
 	}
@@ -521,7 +513,7 @@ static void dplane_ctx_free(struct zebra_dplane_ctx **pctx)
 		zebra_nhlfe_t *nhlfe, *next;
 
 		/* Free allocated NHLFEs */
-		for (nhlfe = (*pctx)->u.lsp.nhlfe_list; nhlfe; nhlfe = next) {
+		for (nhlfe = ctx->u.lsp.nhlfe_list; nhlfe; nhlfe = next) {
 			next = nhlfe->next;
 
 			zebra_mpls_nhlfe_del(nhlfe);
@@ -530,30 +522,30 @@ static void dplane_ctx_free(struct zebra_dplane_ctx **pctx)
 		/* Clear pointers in lsp struct, in case we're cacheing
 		 * free context structs.
 		 */
-		(*pctx)->u.lsp.nhlfe_list = NULL;
-		(*pctx)->u.lsp.best_nhlfe = NULL;
+		ctx->u.lsp.nhlfe_list = NULL;
+		ctx->u.lsp.best_nhlfe = NULL;
 
 		break;
 	}
 
 	case DPLANE_OP_PW_INSTALL:
 	case DPLANE_OP_PW_UNINSTALL:
 		/* Free allocated nexthops */
-		if ((*pctx)->u.pw.nhg.nexthop) {
+		if (ctx->u.pw.nhg.nexthop) {
 			/* This deals with recursive nexthops too */
-			nexthops_free((*pctx)->u.pw.nhg.nexthop);
+			nexthops_free(ctx->u.pw.nhg.nexthop);
 
-			(*pctx)->u.pw.nhg.nexthop = NULL;
+			ctx->u.pw.nhg.nexthop = NULL;
 		}
 		break;
 
 	case DPLANE_OP_ADDR_INSTALL:
 	case DPLANE_OP_ADDR_UNINSTALL:
 		/* Maybe free label string, if allocated */
-		if ((*pctx)->u.intf.label != NULL &&
-		    (*pctx)->u.intf.label != (*pctx)->u.intf.label_buf) {
-			free((*pctx)->u.intf.label);
-			(*pctx)->u.intf.label = NULL;
+		if (ctx->u.intf.label != NULL &&
+		    ctx->u.intf.label != ctx->u.intf.label_buf) {
+			free(ctx->u.intf.label);
+			ctx->u.intf.label = NULL;
 		}
 		break;
 
@@ -567,10 +559,40 @@ static void dplane_ctx_free(struct zebra_dplane_ctx **pctx)
 	case DPLANE_OP_NONE:
 		break;
 	}
+}
+
+/*
+ * Free a dataplane results context.
+ */
+static void dplane_ctx_free(struct zebra_dplane_ctx **pctx)
+{
+	if (pctx == NULL)
+		return;
+
+	DPLANE_CTX_VALID(*pctx);
+
+	/* TODO -- just freeing memory, but would like to maintain
+	 * a pool
+	 */
+
+	/* Some internal allocations may need to be freed, depending on
+	 * the type of info captured in the ctx.
+	 */
+	dplane_ctx_free_internal(*pctx);
 
 	XFREE(MTYPE_DP_CTX, *pctx);
 }
 
+/*
+ * Reset an allocated context object for re-use. All internal allocations are
+ * freed and the context is memset.
+ */
+void dplane_ctx_reset(struct zebra_dplane_ctx *ctx)
+{
+	dplane_ctx_free_internal(ctx);
+	memset(ctx, 0, sizeof(*ctx));
+}
+
 /*
  * Return a context block to the dplane module after processing
  */
@@ -2470,8 +2492,8 @@ enum zebra_dplane_result dplane_mac_add(const struct interface *ifp,
 	enum zebra_dplane_result result;
 
 	/* Use common helper api */
-	result = mac_update_internal(DPLANE_OP_MAC_INSTALL, ifp, bridge_ifp,
-				     vid, mac, vtep_ip, sticky);
+	result = mac_update_common(DPLANE_OP_MAC_INSTALL, ifp, bridge_ifp,
+				   vid, mac, vtep_ip, sticky);
 	return result;
 }
 
@@ -2487,41 +2509,25 @@ enum zebra_dplane_result dplane_mac_del(const struct interface *ifp,
 	enum zebra_dplane_result result;
 
 	/* Use common helper api */
-	result = mac_update_internal(DPLANE_OP_MAC_DELETE, ifp, bridge_ifp,
-				     vid, mac, vtep_ip, false);
+	result = mac_update_common(DPLANE_OP_MAC_DELETE, ifp, bridge_ifp,
+				   vid, mac, vtep_ip, false);
 	return result;
 }
 
 /*
- * Common helper api for MAC address/vxlan updates
+ * Public api to init an empty context - either newly-allocated or
+ * reset/cleared - for a MAC update.
  */
-static enum zebra_dplane_result
-mac_update_internal(enum dplane_op_e op,
-		    const struct interface *ifp,
-		    const struct interface *br_ifp,
-		    vlanid_t vid,
-		    const struct ethaddr *mac,
-		    struct in_addr vtep_ip,
-		    bool sticky)
+void dplane_mac_init(struct zebra_dplane_ctx *ctx,
+		     const struct interface *ifp,
+		     const struct interface *br_ifp,
+		     vlanid_t vid,
+		     const struct ethaddr *mac,
+		     struct in_addr vtep_ip,
+		     bool sticky)
 {
-	enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
-	int ret;
-	struct zebra_dplane_ctx *ctx = NULL;
 	struct zebra_ns *zns;
 
-	if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
-		char buf1[ETHER_ADDR_STRLEN], buf2[PREFIX_STRLEN];
-
-		zlog_debug("init mac ctx %s: mac %s, ifp %s, vtep %s",
-			   dplane_op2str(op),
-			   prefix_mac2str(mac, buf1, sizeof(buf1)),
-			   ifp->name,
-			   inet_ntop(AF_INET, &vtep_ip, buf2, sizeof(buf2)));
-	}
-
-	ctx = dplane_ctx_alloc();
-
-	ctx->zd_op = op;
 	ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
 	ctx->zd_vrf_id = ifp->vrf_id;
 
@@ -2539,6 +2545,39 @@ mac_update_internal(enum dplane_op_e op,
 	ctx->u.macinfo.mac = *mac;
 	ctx->u.macinfo.vid = vid;
 	ctx->u.macinfo.is_sticky = sticky;
+}
+
+/*
+ * Common helper api for MAC address/vxlan updates
+ */
+static enum zebra_dplane_result
+mac_update_common(enum dplane_op_e op,
+		  const struct interface *ifp,
+		  const struct interface *br_ifp,
+		  vlanid_t vid,
+		  const struct ethaddr *mac,
+		  struct in_addr vtep_ip,
+		  bool sticky)
+{
+	enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
+	int ret;
+	struct zebra_dplane_ctx *ctx = NULL;
+
+	if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
+		char buf1[ETHER_ADDR_STRLEN], buf2[PREFIX_STRLEN];
+
+		zlog_debug("init mac ctx %s: mac %s, ifp %s, vtep %s",
+			   dplane_op2str(op),
+			   prefix_mac2str(mac, buf1, sizeof(buf1)),
+			   ifp->name,
+			   inet_ntop(AF_INET, &vtep_ip, buf2, sizeof(buf2)));
+	}
+
+	ctx = dplane_ctx_alloc();
+	ctx->zd_op = op;
+
+	/* Common init for the ctx */
+	dplane_mac_init(ctx, ifp, br_ifp, vid, mac, vtep_ip, sticky);
 
 	/* Enqueue for processing on the dplane pthread */
 	ret = dplane_update_enqueue(ctx);

zebra/zebra_dplane.h

@@ -180,6 +180,12 @@ TAILQ_HEAD(dplane_ctx_q, zebra_dplane_ctx);
 /* Allocate a context object */
 struct zebra_dplane_ctx *dplane_ctx_alloc(void);
 
+/*
+ * Reset an allocated context object for re-use. All internal allocations are
+ * freed.
+ */
+void dplane_ctx_reset(struct zebra_dplane_ctx *ctx);
+
 /* Return a dataplane results context block after use; the caller's pointer will
  * be cleared.
  */
@@ -451,6 +457,15 @@ enum zebra_dplane_result dplane_mac_del(const struct interface *ifp,
 					const struct ethaddr *mac,
 					struct in_addr vtep_ip);
 
+/* Helper api to init an empty or new context for a MAC update */
+void dplane_mac_init(struct zebra_dplane_ctx *ctx,
+		     const struct interface *ifp,
+		     const struct interface *br_ifp,
+		     vlanid_t vid,
+		     const struct ethaddr *mac,
+		     struct in_addr vtep_ip,
+		     bool sticky);
+
 /*
  * Enqueue evpn neighbor updates for the dataplane.
  */