Improve VNIC performance on Tx path by immediate packet transmission
Don't postpone Tx if the Tx lock can be acquired now. This gives 3x better performance on egress. Reviewed by: wma Obtained from: Semihalf Sponsored by: Cavium Differential Revision: https://reviews.freebsd.org/D5325
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=296035
@ -663,11 +663,18 @@ nicvf_if_transmit(struct ifnet *ifp, struct mbuf *mbuf)
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mbuf = mtmp;
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}
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}
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if (NICVF_TX_TRYLOCK(sq) != 0) {
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err = nicvf_tx_mbuf_locked(sq, mbuf);
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NICVF_TX_UNLOCK(sq);
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return (err);
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} else {
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err = drbr_enqueue(ifp, sq->br, mbuf);
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if (err != 0)
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return (err);
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taskqueue_enqueue(sq->snd_taskq, &sq->snd_task);
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taskqueue_enqueue(sq->snd_taskq, &sq->snd_task);
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}
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return (0);
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}
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@ -98,7 +98,6 @@ __FBSDID("$FreeBSD$");
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MALLOC_DECLARE(M_NICVF);
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static void nicvf_free_snd_queue(struct nicvf *, struct snd_queue *);
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static int nicvf_tx_mbuf_locked(struct snd_queue *, struct mbuf *);
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static struct mbuf * nicvf_get_rcv_mbuf(struct nicvf *, struct cqe_rx_t *);
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static void nicvf_sq_disable(struct nicvf *, int);
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static void nicvf_sq_enable(struct nicvf *, struct snd_queue *, int);
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@ -1856,7 +1855,7 @@ static inline void nicvf_sq_add_gather_subdesc(struct snd_queue *sq, int qentry,
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}
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/* Put an mbuf to a SQ for packet transfer. */
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static int
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int
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nicvf_tx_mbuf_locked(struct snd_queue *sq, struct mbuf *mbuf)
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{
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bus_dma_segment_t segs[256];
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@ -385,6 +385,8 @@ void nicvf_disable_intr(struct nicvf *, int, int);
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void nicvf_clear_intr(struct nicvf *, int, int);
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int nicvf_is_intr_enabled(struct nicvf *, int, int);
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int nicvf_tx_mbuf_locked(struct snd_queue *, struct mbuf *);
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/* Register access APIs */
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void nicvf_reg_write(struct nicvf *, uint64_t, uint64_t);
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uint64_t nicvf_reg_read(struct nicvf *, uint64_t);
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