From: Stefan Raspl Date: Mon, 23 Jul 2018 11:53:09 +0000 (+0200) Subject: net/smc: eliminate cursor read and write calls X-Git-Tag: v4.19~410^2~285^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bac6de7b637018f4caacfdf2b4ad8c8749de7420;p=platform%2Fkernel%2Flinux-rpi.git net/smc: eliminate cursor read and write calls The functions to read and write cursors are exclusively used to copy cursors. Therefore switch to a respective function instead. Signed-off-by: Stefan Raspl Signed-off-by: Ursula Braun Signed-off-by: David S. Miller --- diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 143b222..7fc810e 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -1755,12 +1755,8 @@ static int smc_ioctl(struct socket *sock, unsigned int cmd, smc->sk.sk_state == SMC_CLOSED) { answ = 0; } else { - smc_curs_write(&cons, - smc_curs_read(&conn->local_tx_ctrl.cons, conn), - conn); - smc_curs_write(&urg, - smc_curs_read(&conn->urg_curs, conn), - conn); + smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); + smc_curs_copy(&urg, &conn->urg_curs, conn); answ = smc_curs_diff(conn->rmb_desc->len, &cons, &urg) == 1; } diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c index 621d8cc..f3a1497 100644 --- a/net/smc/smc_cdc.c +++ b/net/smc/smc_cdc.c @@ -34,14 +34,15 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd, enum ib_wc_status wc_status) { struct smc_cdc_tx_pend *cdcpend = (struct smc_cdc_tx_pend *)pnd_snd; + struct smc_connection *conn = cdcpend->conn; struct smc_sock *smc; int diff; - if (!cdcpend->conn) + if (!conn) /* already dismissed */ return; - smc = container_of(cdcpend->conn, struct smc_sock, conn); + smc = container_of(conn, struct smc_sock, conn); bh_lock_sock(&smc->sk); if (!wc_status) { diff = smc_curs_diff(cdcpend->conn->sndbuf_desc->len, @@ -52,9 +53,7 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd, atomic_add(diff, &cdcpend->conn->sndbuf_space); /* guarantee 0 <= sndbuf_space <= sndbuf_desc->len */ smp_mb__after_atomic(); - smc_curs_write(&cdcpend->conn->tx_curs_fin, - smc_curs_read(&cdcpend->cursor, cdcpend->conn), - cdcpend->conn); + smc_curs_copy(&conn->tx_curs_fin, &cdcpend->cursor, conn); } smc_tx_sndbuf_nonfull(smc); bh_unlock_sock(&smc->sk); @@ -110,9 +109,8 @@ int smc_cdc_msg_send(struct smc_connection *conn, &conn->local_tx_ctrl, conn); rc = smc_wr_tx_send(link, (struct smc_wr_tx_pend_priv *)pend); if (!rc) - smc_curs_write(&conn->rx_curs_confirmed, - smc_curs_read(&conn->local_tx_ctrl.cons, conn), - conn); + smc_curs_copy(&conn->rx_curs_confirmed, + &conn->local_tx_ctrl.cons, conn); return rc; } @@ -194,8 +192,8 @@ int smcd_cdc_msg_send(struct smc_connection *conn) rc = smcd_tx_ism_write(conn, &cdc, sizeof(cdc), 0, 1); if (rc) return rc; - smc_curs_write(&conn->rx_curs_confirmed, - smc_curs_read(&conn->local_tx_ctrl.cons, conn), conn); + smc_curs_copy(&conn->rx_curs_confirmed, &conn->local_tx_ctrl.cons, + conn); /* Calculate transmitted data and increment free send buffer space */ diff = smc_curs_diff(conn->sndbuf_desc->len, &conn->tx_curs_fin, &conn->tx_curs_sent); @@ -204,8 +202,7 @@ int smcd_cdc_msg_send(struct smc_connection *conn) atomic_add(diff, &conn->sndbuf_space); /* guarantee 0 <= sndbuf_space <= sndbuf_desc->len */ smp_mb__after_atomic(); - smc_curs_write(&conn->tx_curs_fin, - smc_curs_read(&conn->tx_curs_sent, conn), conn); + smc_curs_copy(&conn->tx_curs_fin, &conn->tx_curs_sent, conn); smc_tx_sndbuf_nonfull(smc); return rc; @@ -225,9 +222,7 @@ static void smc_cdc_handle_urg_data_arrival(struct smc_sock *smc, char *base; /* new data included urgent business */ - smc_curs_write(&conn->urg_curs, - smc_curs_read(&conn->local_rx_ctrl.prod, conn), - conn); + smc_curs_copy(&conn->urg_curs, &conn->local_rx_ctrl.prod, conn); conn->urg_state = SMC_URG_VALID; if (!sock_flag(&smc->sk, SOCK_URGINLINE)) /* we'll skip the urgent byte, so don't account for it */ @@ -247,12 +242,8 @@ static void smc_cdc_msg_recv_action(struct smc_sock *smc, struct smc_connection *conn = &smc->conn; int diff_cons, diff_prod; - smc_curs_write(&prod_old, - smc_curs_read(&conn->local_rx_ctrl.prod, conn), - conn); - smc_curs_write(&cons_old, - smc_curs_read(&conn->local_rx_ctrl.cons, conn), - conn); + smc_curs_copy(&prod_old, &conn->local_rx_ctrl.prod, conn); + smc_curs_copy(&cons_old, &conn->local_rx_ctrl.cons, conn); smc_cdc_msg_to_host(&conn->local_rx_ctrl, cdc, conn); diff_cons = smc_curs_diff(conn->peer_rmbe_size, &cons_old, diff --git a/net/smc/smc_cdc.h b/net/smc/smc_cdc.h index 8fbce4f..934df44 100644 --- a/net/smc/smc_cdc.h +++ b/net/smc/smc_cdc.h @@ -104,47 +104,34 @@ static inline u64 smc_curs_read(union smc_host_cursor *curs, #endif } -static inline u64 smc_curs_read_net(union smc_cdc_cursor *curs, - struct smc_connection *conn) -{ -#ifndef KERNEL_HAS_ATOMIC64 - unsigned long flags; - u64 ret; - - spin_lock_irqsave(&conn->acurs_lock, flags); - ret = curs->acurs; - spin_unlock_irqrestore(&conn->acurs_lock, flags); - return ret; -#else - return atomic64_read(&curs->acurs); -#endif -} - -static inline void smc_curs_write(union smc_host_cursor *curs, u64 val, - struct smc_connection *conn) +/* Copy cursor src into tgt */ +static inline void smc_curs_copy(union smc_host_cursor *tgt, + union smc_host_cursor *src, + struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; spin_lock_irqsave(&conn->acurs_lock, flags); - curs->acurs = val; + tgt->acurs = src->acurs; spin_unlock_irqrestore(&conn->acurs_lock, flags); #else - atomic64_set(&curs->acurs, val); + atomic64_set(&tgt->acurs, atomic64_read(&src->acurs)); #endif } -static inline void smc_curs_write_net(union smc_cdc_cursor *curs, u64 val, - struct smc_connection *conn) +static inline void smc_curs_copy_net(union smc_cdc_cursor *tgt, + union smc_cdc_cursor *src, + struct smc_connection *conn) { #ifndef KERNEL_HAS_ATOMIC64 unsigned long flags; spin_lock_irqsave(&conn->acurs_lock, flags); - curs->acurs = val; + tgt->acurs = src->acurs; spin_unlock_irqrestore(&conn->acurs_lock, flags); #else - atomic64_set(&curs->acurs, val); + atomic64_set(&tgt->acurs, atomic64_read(&src->acurs)); #endif } @@ -179,7 +166,7 @@ static inline void smc_host_cursor_to_cdc(union smc_cdc_cursor *peer, { union smc_host_cursor temp; - smc_curs_write(&temp, smc_curs_read(local, conn), conn); + smc_curs_copy(&temp, local, conn); peer->count = htonl(temp.count); peer->wrap = htons(temp.wrap); /* peer->reserved = htons(0); must be ensured by caller */ @@ -206,8 +193,8 @@ static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local, union smc_host_cursor temp, old; union smc_cdc_cursor net; - smc_curs_write(&old, smc_curs_read(local, conn), conn); - smc_curs_write_net(&net, smc_curs_read_net(peer, conn), conn); + smc_curs_copy(&old, local, conn); + smc_curs_copy_net(&net, peer, conn); temp.count = ntohl(net.count); temp.wrap = ntohs(net.wrap); if ((old.wrap > temp.wrap) && temp.wrap) @@ -215,7 +202,7 @@ static inline void smc_cdc_cursor_to_host(union smc_host_cursor *local, if ((old.wrap == temp.wrap) && (old.count > temp.count)) return; - smc_curs_write(local, smc_curs_read(&temp, conn), conn); + smc_curs_copy(local, &temp, conn); } static inline void smcr_cdc_msg_to_host(struct smc_host_cdc_msg *local, diff --git a/net/smc/smc_rx.c b/net/smc/smc_rx.c index b329803..c99c987 100644 --- a/net/smc/smc_rx.c +++ b/net/smc/smc_rx.c @@ -82,8 +82,7 @@ static int smc_rx_update_consumer(struct smc_sock *smc, } } - smc_curs_write(&conn->local_tx_ctrl.cons, smc_curs_read(&cons, conn), - conn); + smc_curs_copy(&conn->local_tx_ctrl.cons, &cons, conn); /* send consumer cursor update if required */ /* similar to advertising new TCP rcv_wnd if required */ @@ -97,8 +96,7 @@ static void smc_rx_update_cons(struct smc_sock *smc, size_t len) struct smc_connection *conn = &smc->conn; union smc_host_cursor cons; - smc_curs_write(&cons, smc_curs_read(&conn->local_tx_ctrl.cons, conn), - conn); + smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); smc_rx_update_consumer(smc, cons, len); } @@ -245,10 +243,7 @@ static int smc_rx_recv_urg(struct smc_sock *smc, struct msghdr *msg, int len, if (!(flags & MSG_TRUNC)) rc = memcpy_to_msg(msg, &conn->urg_rx_byte, 1); len = 1; - smc_curs_write(&cons, - smc_curs_read(&conn->local_tx_ctrl.cons, - conn), - conn); + smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); if (smc_curs_diff(conn->rmb_desc->len, &cons, &conn->urg_curs) > 1) conn->urg_rx_skip_pend = true; @@ -370,9 +365,7 @@ copy: continue; } - smc_curs_write(&cons, - smc_curs_read(&conn->local_tx_ctrl.cons, conn), - conn); + smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); /* subsequent splice() calls pick up where previous left */ if (splbytes) smc_curs_add(conn->rmb_desc->len, &cons, splbytes); diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c index 142bcb1..2f5e324 100644 --- a/net/smc/smc_tx.c +++ b/net/smc/smc_tx.c @@ -181,9 +181,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len) copylen = min_t(size_t, send_remaining, writespace); /* determine start of sndbuf */ sndbuf_base = conn->sndbuf_desc->cpu_addr; - smc_curs_write(&prep, - smc_curs_read(&conn->tx_curs_prep, conn), - conn); + smc_curs_copy(&prep, &conn->tx_curs_prep, conn); tx_cnt_prep = prep.count; /* determine chunks where to write into sndbuf */ /* either unwrapped case, or 1st chunk of wrapped case */ @@ -214,9 +212,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len) smc_sndbuf_sync_sg_for_device(conn); /* update cursors */ smc_curs_add(conn->sndbuf_desc->len, &prep, copylen); - smc_curs_write(&conn->tx_curs_prep, - smc_curs_read(&prep, conn), - conn); + smc_curs_copy(&conn->tx_curs_prep, &prep, conn); /* increased in send tasklet smc_cdc_tx_handler() */ smp_mb__before_atomic(); atomic_sub(copylen, &conn->sndbuf_space); @@ -417,8 +413,8 @@ static int smc_tx_rdma_writes(struct smc_connection *conn) int rc; /* source: sndbuf */ - smc_curs_write(&sent, smc_curs_read(&conn->tx_curs_sent, conn), conn); - smc_curs_write(&prep, smc_curs_read(&conn->tx_curs_prep, conn), conn); + smc_curs_copy(&sent, &conn->tx_curs_sent, conn); + smc_curs_copy(&prep, &conn->tx_curs_prep, conn); /* cf. wmem_alloc - (snd_max - snd_una) */ to_send = smc_curs_diff(conn->sndbuf_desc->len, &sent, &prep); if (to_send <= 0) @@ -429,12 +425,8 @@ static int smc_tx_rdma_writes(struct smc_connection *conn) rmbespace = atomic_read(&conn->peer_rmbe_space); if (rmbespace <= 0) return 0; - smc_curs_write(&prod, - smc_curs_read(&conn->local_tx_ctrl.prod, conn), - conn); - smc_curs_write(&cons, - smc_curs_read(&conn->local_rx_ctrl.cons, conn), - conn); + smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); + smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); /* if usable snd_wnd closes ask peer to advertise once it opens again */ pflags = &conn->local_tx_ctrl.prod_flags; @@ -481,14 +473,9 @@ static int smc_tx_rdma_writes(struct smc_connection *conn) pflags->urg_data_present = 1; smc_tx_advance_cursors(conn, &prod, &sent, len); /* update connection's cursors with advanced local cursors */ - smc_curs_write(&conn->local_tx_ctrl.prod, - smc_curs_read(&prod, conn), - conn); + smc_curs_copy(&conn->local_tx_ctrl.prod, &prod, conn); /* dst: peer RMBE */ - smc_curs_write(&conn->tx_curs_sent, - smc_curs_read(&sent, conn), - conn); - /* src: local sndbuf */ + smc_curs_copy(&conn->tx_curs_sent, &sent, conn);/* src: local sndbuf */ return 0; } @@ -606,17 +593,11 @@ void smc_tx_consumer_update(struct smc_connection *conn, bool force) int sender_free = conn->rmb_desc->len; int to_confirm; - smc_curs_write(&cons, - smc_curs_read(&conn->local_tx_ctrl.cons, conn), - conn); - smc_curs_write(&cfed, - smc_curs_read(&conn->rx_curs_confirmed, conn), - conn); + smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); + smc_curs_copy(&cfed, &conn->rx_curs_confirmed, conn); to_confirm = smc_curs_diff(conn->rmb_desc->len, &cfed, &cons); if (to_confirm > conn->rmbe_update_limit) { - smc_curs_write(&prod, - smc_curs_read(&conn->local_rx_ctrl.prod, conn), - conn); + smc_curs_copy(&prod, &conn->local_rx_ctrl.prod, conn); sender_free = conn->rmb_desc->len - smc_curs_diff(conn->rmb_desc->len, &prod, &cfed); } @@ -632,9 +613,8 @@ void smc_tx_consumer_update(struct smc_connection *conn, bool force) SMC_TX_WORK_DELAY); return; } - smc_curs_write(&conn->rx_curs_confirmed, - smc_curs_read(&conn->local_tx_ctrl.cons, conn), - conn); + smc_curs_copy(&conn->rx_curs_confirmed, + &conn->local_tx_ctrl.cons, conn); conn->local_rx_ctrl.prod_flags.cons_curs_upd_req = 0; } if (conn->local_rx_ctrl.prod_flags.write_blocked && diff --git a/net/smc/smc_tx.h b/net/smc/smc_tx.h index b22bdc5..07e6ad7 100644 --- a/net/smc/smc_tx.h +++ b/net/smc/smc_tx.h @@ -22,8 +22,8 @@ static inline int smc_tx_prepared_sends(struct smc_connection *conn) { union smc_host_cursor sent, prep; - smc_curs_write(&sent, smc_curs_read(&conn->tx_curs_sent, conn), conn); - smc_curs_write(&prep, smc_curs_read(&conn->tx_curs_prep, conn), conn); + smc_curs_copy(&sent, &conn->tx_curs_sent, conn); + smc_curs_copy(&prep, &conn->tx_curs_prep, conn); return smc_curs_diff(conn->sndbuf_desc->len, &sent, &prep); }