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net: bcmgenet: fix dev->stats.tx_bytes accounting

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1. Add bytes_compl local variable to __bcmgenet_tx_reclaim() to collect
   transmitted bytes. dev->stats updates can then be moved outside the
   while-loop. bytes_compl is also needed for future BQL support.
2. When bcmgenet device uses Tx checksum offload, each transmitted skb
   gets an extra 64-byte header prepended to it. Before this header is
   prepended to the skb, we need to save the skb "wire" length in
   GENET_CB(skb)->bytes_sent, so that proper Tx bytes accounting can
   be done in __bcmgenet_tx_reclaim().
3. skb->len covers the entire length of skb, whether it is linear or
   fragmented. Thus, when we clean the fragments, do not increase
   transmitted bytes.

Fixes: 1c1008c793 ("net: bcmgenet: add main driver file")
Signed-off-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petri Gynther
2016-03-24 11:27:20 -07:00
committed by David S. Miller
parent 3e34766048
commit 55868120a3
2 changed files with 16 additions and 4 deletions
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6
drivers/net/ethernet/broadcom/genet/bcmgenet.h
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@@ -531,6 +531,12 @@ struct bcmgenet_hw_params {
u32 flags;
};
struct bcmgenet_skb_cb {
unsigned int bytes_sent; /* bytes on the wire (no TSB) */
};
#define GENET_CB(skb) ((struct bcmgenet_skb_cb *)((skb)->cb))
struct bcmgenet_tx_ring {
spinlock_t lock; /* ring lock */
struct napi_struct napi; /* NAPI per tx queue */