-/**
- * spider_net_release_tx_descr - processes a used tx descriptor
- * @card: card structure
- * @descr: descriptor to release
- *
- * releases a used tx descriptor (unmapping, freeing of skb)
- */
-static void
-spider_net_release_tx_descr(struct spider_net_card *card,
- struct spider_net_descr *descr)
-{
- struct sk_buff *skb;
-
- /* unmap the skb */
- skb = descr->skb;
- pci_unmap_single(card->pdev, descr->buf_addr, skb->len,
- PCI_DMA_BIDIRECTIONAL);
-
- dev_kfree_skb_any(skb);
-
- /* set status to not used */
- spider_net_set_descr_status(descr, SPIDER_NET_DESCR_NOT_IN_USE);
-}
-
-/**
- * spider_net_release_tx_chain - processes sent tx descriptors
- * @card: adapter structure
- * @brutal: if set, don't care about whether descriptor seems to be in use
- *
- * returns 0 if the tx ring is empty, otherwise 1.
- *
- * spider_net_release_tx_chain releases the tx descriptors that spider has
- * finished with (if non-brutal) or simply release tx descriptors (if brutal).
- * If some other context is calling this function, we return 1 so that we're
- * scheduled again (if we were scheduled) and will not loose initiative.
- */
-static int
-spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
-{
- struct spider_net_descr_chain *tx_chain = &card->tx_chain;
- enum spider_net_descr_status status;
-
- if (atomic_inc_return(&card->tx_chain_release) != 1) {
- atomic_dec(&card->tx_chain_release);
- return 1;
- }
-
- for (;;) {
- status = spider_net_get_descr_status(tx_chain->tail);
- switch (status) {
- case SPIDER_NET_DESCR_CARDOWNED:
- if (!brutal)
- goto out;
- /* fallthrough, if we release the descriptors
- * brutally (then we don't care about
- * SPIDER_NET_DESCR_CARDOWNED) */
- case SPIDER_NET_DESCR_RESPONSE_ERROR:
- case SPIDER_NET_DESCR_PROTECTION_ERROR:
- case SPIDER_NET_DESCR_FORCE_END:
- if (netif_msg_tx_err(card))
- pr_err("%s: forcing end of tx descriptor "
- "with status x%02x\n",
- card->netdev->name, status);
- card->netdev_stats.tx_dropped++;
- break;
-
- case SPIDER_NET_DESCR_COMPLETE:
- card->netdev_stats.tx_packets++;
- card->netdev_stats.tx_bytes +=
- tx_chain->tail->skb->len;
- break;
-
- default: /* any other value (== SPIDER_NET_DESCR_NOT_IN_USE) */
- goto out;
- }
- spider_net_release_tx_descr(card, tx_chain->tail);
- tx_chain->tail = tx_chain->tail->next;
- }
-out:
- atomic_dec(&card->tx_chain_release);
-
- netif_wake_queue(card->netdev);
-
- if (status == SPIDER_NET_DESCR_CARDOWNED)
- return 1;
- return 0;
-}
-
-/**
- * spider_net_cleanup_tx_ring - cleans up the TX ring
- * @card: card structure
- *
- * spider_net_cleanup_tx_ring is called by the tx_timer (as we don't use
- * interrupts to cleanup our TX ring) and returns sent packets to the stack
- * by freeing them
- */
-static void
-spider_net_cleanup_tx_ring(struct spider_net_card *card)
-{
- if ( (spider_net_release_tx_chain(card, 0)) &&
- (card->netdev->flags & IFF_UP) ) {
- mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
- }
-}
-