net: skb: plumb napi state thru skb freeing paths

We maintain a NAPI-local cache of skbs which is fed by napi_consume_skb().
Going forward we will also try to cache head and data pages.
Plumb the "are we in a normal NAPI context" information thru
deeper into the freeing path, up to skb_release_data() and
skb_free_head()/skb_pp_recycle(). The "not normal NAPI context"
comes from netpoll which passes budget of 0 to try to reap
the Tx completions but not perform any Rx.

Use "bool napi_safe" rather than bare "int budget",
the further we get from NAPI the more confusing the budget
argument may seem (particularly whether 0 or MAX is the
correct value to pass in when not in NAPI).

Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Tested-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 78238a1..2b5a98c 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -839,7 +839,7 @@ static void skb_clone_fraglist(struct sk_buff *skb)
                skb_get(list);
 }
 
-static bool skb_pp_recycle(struct sk_buff *skb, void *data)
+static bool skb_pp_recycle(struct sk_buff *skb, void *data, bool napi_safe)
 {
        if (!IS_ENABLED(CONFIG_PAGE_POOL) || !skb->pp_recycle)
                return false;
@@ -856,12 +856,12 @@ static void skb_kfree_head(void *head, unsigned int end_offset)
                kfree(head);
 }
 
-static void skb_free_head(struct sk_buff *skb)
+static void skb_free_head(struct sk_buff *skb, bool napi_safe)
 {
        unsigned char *head = skb->head;
 
        if (skb->head_frag) {
-               if (skb_pp_recycle(skb, head))
+               if (skb_pp_recycle(skb, head, napi_safe))
                        return;
                skb_free_frag(head);
        } else {
@@ -869,7 +869,8 @@ static void skb_free_head(struct sk_buff *skb)
        }
 }
 
-static void skb_release_data(struct sk_buff *skb, enum skb_drop_reason reason)
+static void skb_release_data(struct sk_buff *skb, enum skb_drop_reason reason,
+                            bool napi_safe)
 {
        struct skb_shared_info *shinfo = skb_shinfo(skb);
        int i;
@@ -894,7 +895,7 @@ free_head:
        if (shinfo->frag_list)
                kfree_skb_list_reason(shinfo->frag_list, reason);
 
-       skb_free_head(skb);
+       skb_free_head(skb, napi_safe);
 exit:
        /* When we clone an SKB we copy the reycling bit. The pp_recycle
         * bit is only set on the head though, so in order to avoid races
@@ -955,11 +956,12 @@ void skb_release_head_state(struct sk_buff *skb)
 }
 
 /* Free everything but the sk_buff shell. */
-static void skb_release_all(struct sk_buff *skb, enum skb_drop_reason reason)
+static void skb_release_all(struct sk_buff *skb, enum skb_drop_reason reason,
+                           bool napi_safe)
 {
        skb_release_head_state(skb);
        if (likely(skb->head))
-               skb_release_data(skb, reason);
+               skb_release_data(skb, reason, napi_safe);
 }
 
 /**
@@ -973,7 +975,7 @@ static void skb_release_all(struct sk_buff *skb, enum skb_drop_reason reason)
 
 void __kfree_skb(struct sk_buff *skb)
 {
-       skb_release_all(skb, SKB_DROP_REASON_NOT_SPECIFIED);
+       skb_release_all(skb, SKB_DROP_REASON_NOT_SPECIFIED, false);
        kfree_skbmem(skb);
 }
 EXPORT_SYMBOL(__kfree_skb);
@@ -1027,7 +1029,7 @@ static void kfree_skb_add_bulk(struct sk_buff *skb,
                return;
        }
 
-       skb_release_all(skb, reason);
+       skb_release_all(skb, reason, false);
        sa->skb_array[sa->skb_count++] = skb;
 
        if (unlikely(sa->skb_count == KFREE_SKB_BULK_SIZE)) {
@@ -1201,7 +1203,7 @@ EXPORT_SYMBOL(consume_skb);
 void __consume_stateless_skb(struct sk_buff *skb)
 {
        trace_consume_skb(skb, __builtin_return_address(0));
-       skb_release_data(skb, SKB_CONSUMED);
+       skb_release_data(skb, SKB_CONSUMED, false);
        kfree_skbmem(skb);
 }
 
@@ -1226,7 +1228,7 @@ static void napi_skb_cache_put(struct sk_buff *skb)
 
 void __kfree_skb_defer(struct sk_buff *skb)
 {
-       skb_release_all(skb, SKB_DROP_REASON_NOT_SPECIFIED);
+       skb_release_all(skb, SKB_DROP_REASON_NOT_SPECIFIED, true);
        napi_skb_cache_put(skb);
 }
 
@@ -1264,7 +1266,7 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
                return;
        }
 
-       skb_release_all(skb, SKB_CONSUMED);
+       skb_release_all(skb, SKB_CONSUMED, !!budget);
        napi_skb_cache_put(skb);
 }
 EXPORT_SYMBOL(napi_consume_skb);
@@ -1395,7 +1397,7 @@ EXPORT_SYMBOL_GPL(alloc_skb_for_msg);
  */
 struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src)
 {
-       skb_release_all(dst, SKB_CONSUMED);
+       skb_release_all(dst, SKB_CONSUMED, false);
        return __skb_clone(dst, src);
 }
 EXPORT_SYMBOL_GPL(skb_morph);
@@ -2018,9 +2020,9 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
                if (skb_has_frag_list(skb))
                        skb_clone_fraglist(skb);
 
-               skb_release_data(skb, SKB_CONSUMED);
+               skb_release_data(skb, SKB_CONSUMED, false);
        } else {
-               skb_free_head(skb);
+               skb_free_head(skb, false);
        }
        off = (data + nhead) - skb->head;
 
@@ -6389,12 +6391,12 @@ static int pskb_carve_inside_header(struct sk_buff *skb, const u32 off,
                        skb_frag_ref(skb, i);
                if (skb_has_frag_list(skb))
                        skb_clone_fraglist(skb);
-               skb_release_data(skb, SKB_CONSUMED);
+               skb_release_data(skb, SKB_CONSUMED, false);
        } else {
                /* we can reuse existing recount- all we did was
                 * relocate values
                 */
-               skb_free_head(skb);
+               skb_free_head(skb, false);
        }
 
        skb->head = data;
@@ -6529,7 +6531,7 @@ static int pskb_carve_inside_nonlinear(struct sk_buff *skb, const u32 off,
                skb_kfree_head(data, size);
                return -ENOMEM;
        }
-       skb_release_data(skb, SKB_CONSUMED);
+       skb_release_data(skb, SKB_CONSUMED, false);
 
        skb->head = data;
        skb->head_frag = 0;