[PATCH v6 16/21] ebpf: Fix RSS error handling

[Akihiko Odaki]

calculate_rss_hash() was using hash value 0 to tell if it calculated
a hash, but the hash value may be 0 on a rare occasion. Have a
distinct bool value for correctness.

Fixes: f3fa412de2 ("ebpf: Added eBPF RSS program.")
Signed-off-by: Akihiko Odaki <akihiko.od...@daynix.com>
---
 tools/ebpf/rss.bpf.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/tools/ebpf/rss.bpf.c b/tools/ebpf/rss.bpf.c
index 20f227e2ac..667ea6899e 100644
--- a/tools/ebpf/rss.bpf.c
+++ b/tools/ebpf/rss.bpf.c
@@ -377,18 +377,19 @@ error:
     return err;
 }
 
-static inline __u32 calculate_rss_hash(struct __sk_buff *skb,
-        struct rss_config_t *config, struct toeplitz_key_data_t *toe)
+static inline bool calculate_rss_hash(struct __sk_buff *skb,
+                                      struct rss_config_t *config,
+                                      struct toeplitz_key_data_t *toe,
+                                      __u32 *result)
 {
     __u8 rss_input[HASH_CALCULATION_BUFFER_SIZE] = {};
     size_t bytes_written = 0;
-    __u32 result = 0;
     int err = 0;
     struct packet_hash_info_t packet_info = {};
 
     err = parse_packet(skb, &packet_info);
     if (err) {
-        return 0;
+        return false;
     }
 
     if (packet_info.is_ipv4) {
@@ -521,11 +522,13 @@ static inline __u32 calculate_rss_hash(struct __sk_buff 
*skb,
         }
     }
 
-    if (bytes_written) {
-        net_toeplitz_add(&result, rss_input, bytes_written, toe);
+    if (!bytes_written) {
+        return false;
     }
 
-    return result;
+    net_toeplitz_add(result, rss_input, bytes_written, toe);
+
+    return true;
 }
 
 SEC("tun_rss_steering")
@@ -546,8 +549,7 @@ int tun_rss_steering_prog(struct __sk_buff *skb)
             return config->default_queue;
         }
 
-        hash = calculate_rss_hash(skb, config, toe);
-        if (hash) {
+        if (calculate_rss_hash(skb, config, toe, &hash)) {
             __u32 table_idx = hash % config->indirections_len;
             __u16 *queue = 0;
 
-- 
2.42.0