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Add a new helper function bnxt_ptp_get_txts_prod() to decrement ptp->tx_avail under spinlock and return the producer. Signed-off-by: Pavan Chebbi Signed-off-by: Michael Chan --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 20 +++------------- drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 23 +++++++++++++++---- drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h | 10 +++++++- 3 files changed, 31 insertions(+), 22 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 9cb81b74fac9..a1690207d793 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -519,34 +519,20 @@ static netdev_tx_t bnxt_start_xmit(struct sk_buff *skb, struct net_device *dev) } else if (!skb_is_gso(skb)) { u16 seq_id, hdr_off; - if (atomic_dec_if_positive(&ptp->tx_avail) < 0) { - atomic64_inc(&ptp->stats.ts_err); - goto tx_no_ts; - } - - if (!bnxt_ptp_parse(skb, &seq_id, &hdr_off)) { + if (!bnxt_ptp_parse(skb, &seq_id, &hdr_off) && + !bnxt_ptp_get_txts_prod(ptp, &txts_prod)) { if (vlan_tag_flags) hdr_off += VLAN_HLEN; lflags |= cpu_to_le32(TX_BD_FLAGS_STAMP); tx_buf->is_ts_pkt = 1; skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; - spin_lock_bh(&ptp->ptp_tx_lock); - txts_prod = ptp->txts_prod; - ptp->txts_prod = NEXT_TXTS(txts_prod); - spin_unlock_bh(&ptp->ptp_tx_lock); - ptp->txts_req[txts_prod].tx_seqid = seq_id; ptp->txts_req[txts_prod].tx_hdr_off = hdr_off; tx_buf->txts_prod = txts_prod; - - } else { - atomic_inc(&bp->ptp_cfg->tx_avail); } } } - -tx_no_ts: if (unlikely(skb->no_fcs)) lflags |= cpu_to_le32(TX_BD_FLAGS_NO_CRC); @@ -12183,7 +12169,7 @@ static int __bnxt_open_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init) if (BNXT_PF(bp)) bnxt_vf_reps_open(bp); if (bp->ptp_cfg && !(bp->fw_cap & BNXT_FW_CAP_TX_TS_CMP)) - atomic_set(&bp->ptp_cfg->tx_avail, BNXT_MAX_TX_TS); + WRITE_ONCE(bp->ptp_cfg->tx_avail, BNXT_MAX_TX_TS); bnxt_ptp_init_rtc(bp, true); bnxt_ptp_cfg_tstamp_filters(bp); if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp)) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c index 9e93dc8b2b57..37d42423459c 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c @@ -730,10 +730,10 @@ static long bnxt_ptp_ts_aux_work(struct ptp_clock_info *ptp_info) unsigned long now = jiffies; struct bnxt *bp = ptp->bp; u16 cons = ptp->txts_cons; - u8 num_requests; + u32 num_requests; int rc = 0; - num_requests = BNXT_MAX_TX_TS - atomic_read(&ptp->tx_avail); + num_requests = BNXT_MAX_TX_TS - READ_ONCE(ptp->tx_avail); while (num_requests--) { if (IS_ERR(ptp->txts_req[cons].tx_skb)) goto next_slot; @@ -743,7 +743,7 @@ static long bnxt_ptp_ts_aux_work(struct ptp_clock_info *ptp_info) if (rc == -EAGAIN) break; next_slot: - atomic_inc(&ptp->tx_avail); + BNXT_PTP_INC_TX_AVAIL(ptp); cons = NEXT_TXTS(cons); } ptp->txts_cons = cons; @@ -767,6 +767,21 @@ static long bnxt_ptp_ts_aux_work(struct ptp_clock_info *ptp_info) return HZ; } +int bnxt_ptp_get_txts_prod(struct bnxt_ptp_cfg *ptp, u16 *prod) +{ + spin_lock_bh(&ptp->ptp_tx_lock); + if (ptp->tx_avail) { + *prod = ptp->txts_prod; + ptp->txts_prod = NEXT_TXTS(*prod); + ptp->tx_avail--; + spin_unlock_bh(&ptp->ptp_tx_lock); + return 0; + } + spin_unlock_bh(&ptp->ptp_tx_lock); + atomic64_inc(&ptp->stats.ts_err); + return -ENOSPC; +} + void bnxt_get_tx_ts_p5(struct bnxt *bp, struct sk_buff *skb, u16 prod) { struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; @@ -1014,7 +1029,7 @@ int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg) bnxt_ptp_free(bp); - atomic_set(&ptp->tx_avail, BNXT_MAX_TX_TS); + WRITE_ONCE(ptp->tx_avail, BNXT_MAX_TX_TS); spin_lock_init(&ptp->ptp_lock); spin_lock_init(&ptp->ptp_tx_lock); diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h index a1910ce86cbb..a9a2f9a18c9c 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h @@ -116,7 +116,7 @@ struct bnxt_ptp_cfg { struct bnxt_ptp_tx_req txts_req[BNXT_MAX_TX_TS]; struct bnxt *bp; - atomic_t tx_avail; + u32 tx_avail; u16 rxctl; #define BNXT_PTP_MSG_SYNC (1 << 0) #define BNXT_PTP_MSG_DELAY_REQ (1 << 1) @@ -157,6 +157,13 @@ do { \ ((dst) = READ_ONCE(src)) #endif +#define BNXT_PTP_INC_TX_AVAIL(ptp) \ +do { \ + spin_lock_bh(&(ptp)->ptp_tx_lock); \ + (ptp)->tx_avail++; \ + spin_unlock_bh(&(ptp)->ptp_tx_lock); \ +} while (0) + int bnxt_ptp_parse(struct sk_buff *skb, u16 *seq_id, u16 *hdr_off); void bnxt_ptp_update_current_time(struct bnxt *bp); void bnxt_ptp_pps_event(struct bnxt *bp, u32 data1, u32 data2); @@ -164,6 +171,7 @@ int bnxt_ptp_cfg_tstamp_filters(struct bnxt *bp); void bnxt_ptp_reapply_pps(struct bnxt *bp); int bnxt_hwtstamp_set(struct net_device *dev, struct ifreq *ifr); int bnxt_hwtstamp_get(struct net_device *dev, struct ifreq *ifr); +int bnxt_ptp_get_txts_prod(struct bnxt_ptp_cfg *ptp, u16 *prod); void bnxt_get_tx_ts_p5(struct bnxt *bp, struct sk_buff *skb, u16 prod); int bnxt_get_rx_ts_p5(struct bnxt *bp, u64 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