ebpf: drop redundant parameter checks in static methods

Various static methods have checks on their parameters which were
already checked immediately before the method was invoked. Drop
these redundat checks to simplify the following commit which adds
formal error reporting.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

ebpf/ebpf_rss.c

@@ -49,10 +49,6 @@ bool ebpf_rss_is_loaded(struct EBPFRSSContext *ctx)
 
 static bool ebpf_rss_mmap(struct EBPFRSSContext *ctx)
 {
-    if (!ebpf_rss_is_loaded(ctx)) {
-        return false;
-    }
-
     ctx->mmap_configuration = mmap(NULL, qemu_real_host_page_size(),
                                    PROT_READ | PROT_WRITE, MAP_SHARED,
                                    ctx->map_configuration, 0);
@@ -90,10 +86,6 @@ toeplitz_fail:
 
 static void ebpf_rss_munmap(struct EBPFRSSContext *ctx)
 {
-    if (!ebpf_rss_is_loaded(ctx)) {
-        return;
-    }
-
     munmap(ctx->mmap_indirections_table, qemu_real_host_page_size());
     munmap(ctx->mmap_toeplitz_key, qemu_real_host_page_size());
     munmap(ctx->mmap_configuration, qemu_real_host_page_size());
@@ -177,15 +169,10 @@ bool ebpf_rss_load_fds(struct EBPFRSSContext *ctx, int program_fd,
     return true;
 }
 
-static bool ebpf_rss_set_config(struct EBPFRSSContext *ctx,
+static void ebpf_rss_set_config(struct EBPFRSSContext *ctx,
                                 struct EBPFRSSConfig *config)
 {
-    if (!ebpf_rss_is_loaded(ctx)) {
-        return false;
-    }
-
     memcpy(ctx->mmap_configuration, config, sizeof(*config));
-    return true;
 }
 
 static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
@@ -194,8 +181,7 @@ static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
 {
     char *cursor = ctx->mmap_indirections_table;
 
-    if (!ebpf_rss_is_loaded(ctx) || indirections_table == NULL ||
-       len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
+    if (len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
         return false;
     }
 
@@ -207,20 +193,16 @@ static bool ebpf_rss_set_indirections_table(struct EBPFRSSContext *ctx,
     return true;
 }
 
-static bool ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
+static void ebpf_rss_set_toepliz_key(struct EBPFRSSContext *ctx,
                                      uint8_t *toeplitz_key)
 {
     /* prepare toeplitz key */
     uint8_t toe[VIRTIO_NET_RSS_MAX_KEY_SIZE] = {};
 
-    if (!ebpf_rss_is_loaded(ctx) || toeplitz_key == NULL) {
-        return false;
-    }
     memcpy(toe, toeplitz_key, VIRTIO_NET_RSS_MAX_KEY_SIZE);
     *(uint32_t *)toe = ntohl(*(uint32_t *)toe);
 
     memcpy(ctx->mmap_toeplitz_key, toe, VIRTIO_NET_RSS_MAX_KEY_SIZE);
-    return true;
 }
 
 bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
@@ -231,18 +213,14 @@ bool ebpf_rss_set_all(struct EBPFRSSContext *ctx, struct EBPFRSSConfig *config,
         return false;
     }
 
-    if (!ebpf_rss_set_config(ctx, config)) {
-        return false;
-    }
+    ebpf_rss_set_config(ctx, config);
 
     if (!ebpf_rss_set_indirections_table(ctx, indirections_table,
                                       config->indirections_len)) {
         return false;
     }
 
-    if (!ebpf_rss_set_toepliz_key(ctx, toeplitz_key)) {
-        return false;
-    }
+    ebpf_rss_set_toepliz_key(ctx, toeplitz_key);
 
     return true;
 }