From 10428dd8354cc1c74ee806df45c2227c1f9d7b0c Mon Sep 17 00:00:00 2001 From: Ursula Braun Date: Fri, 28 Jul 2017 13:56:22 +0200 Subject: net/smc: synchronize buffer usage with device Usage of send buffer "sndbuf" is synced (a) before filling sndbuf for cpu access (b) after filling sndbuf for device access Usage of receive buffer "RMB" is synced (a) before reading RMB content for cpu access (b) after reading RMB content for device access Signed-off-by: Ursula Braun Signed-off-by: David S. Miller --- net/smc/smc_tx.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/smc/smc_tx.c') diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c index f4d58e2dd559..3c656beb8820 100644 --- a/net/smc/smc_tx.c +++ b/net/smc/smc_tx.c @@ -174,10 +174,12 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len) copylen, conn->sndbuf_size - tx_cnt_prep); chunk_len_sum = chunk_len; chunk_off = tx_cnt_prep; + smc_sndbuf_sync_sg_for_cpu(conn); for (chunk = 0; chunk < 2; chunk++) { rc = memcpy_from_msg(sndbuf_base + chunk_off, msg, chunk_len); if (rc) { + smc_sndbuf_sync_sg_for_device(conn); if (send_done) return send_done; goto out_err; @@ -192,6 +194,7 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len) chunk_len_sum += chunk_len; chunk_off = 0; /* modulo offset in send ring buffer */ } + smc_sndbuf_sync_sg_for_device(conn); /* update cursors */ smc_curs_add(conn->sndbuf_size, &prep, copylen); smc_curs_write(&conn->tx_curs_prep, -- cgit v1.2.3