Author: arybchik Date: Sat May 16 05:37:47 2015 New Revision: 282997 URL: https://svnweb.freebsd.org/changeset/base/282997
Log: sfxge: get rid of locked variable in sfxge_tx_packet_add() Now each branch has one and only one possible TxQ lock state. It simplifies understanding of the code. Reviewed by: gnn Sponsored by: Solarflare Communications, Inc. MFC after: 2 days Differential Revision: https://reviews.freebsd.org/D2551 Modified: head/sys/dev/sfxge/sfxge_tx.c Modified: head/sys/dev/sfxge/sfxge_tx.c ============================================================================== --- head/sys/dev/sfxge/sfxge_tx.c Sat May 16 05:36:40 2015 (r282996) +++ head/sys/dev/sfxge/sfxge_tx.c Sat May 16 05:37:47 2015 (r282997) @@ -602,7 +602,6 @@ sfxge_tx_qdpl_put_unlocked(struct sfxge_ int sfxge_tx_packet_add(struct sfxge_txq *txq, struct mbuf *m) { - int locked; int rc; if (!SFXGE_LINK_UP(txq->sc)) { @@ -616,9 +615,7 @@ sfxge_tx_packet_add(struct sfxge_txq *tx * the packet will be appended to the "get list" of the deferred * packet list. Otherwise, it will be pushed on the "put list". */ - locked = SFXGE_TXQ_TRYLOCK(txq); - - if (locked) { + if (SFXGE_TXQ_TRYLOCK(txq)) { /* First swizzle put-list to get-list to keep order */ sfxge_tx_qdpl_swizzle(txq); @@ -627,6 +624,10 @@ sfxge_tx_packet_add(struct sfxge_txq *tx SFXGE_TXQ_UNLOCK(txq); goto fail; } + + /* Try to service the list. */ + sfxge_tx_qdpl_service(txq); + /* Lock has been dropped. */ } else { rc = sfxge_tx_qdpl_put_unlocked(txq, m); if (rc != 0) @@ -639,14 +640,13 @@ sfxge_tx_packet_add(struct sfxge_txq *tx * the deferred packet list. If we are not able to get * the lock, another thread is processing the list. */ - locked = SFXGE_TXQ_TRYLOCK(txq); + if (SFXGE_TXQ_TRYLOCK(txq)) { + sfxge_tx_qdpl_service(txq); + /* Lock has been dropped. */ + } } - if (locked) { - /* Try to service the list. */ - sfxge_tx_qdpl_service(txq); - /* Lock has been dropped. */ - } + SFXGE_TXQ_LOCK_ASSERT_NOTOWNED(txq); return (0); _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
