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net/smc: synchronize buffer usage with device

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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 <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
2017-07-28 13:56:22 +02:00
committed by David S. Miller
parent b33982c3a6
commit 10428dd835
7 changed files with 91 additions and 0 deletions
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3
net/smc/smc_rx.c
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@@ -170,6 +170,7 @@ copy:
copylen, conn->rmbe_size - cons.count);
chunk_len_sum = chunk_len;
chunk_off = cons.count;
smc_rmb_sync_sg_for_cpu(conn);
for (chunk = 0; chunk < 2; chunk++) {
if (!(flags & MSG_TRUNC)) {
rc = memcpy_to_msg(msg, rcvbuf_base + chunk_off,
@@ -177,6 +178,7 @@ copy:
if (rc) {
if (!read_done)
read_done = -EFAULT;
smc_rmb_sync_sg_for_device(conn);
goto out;
}
}
@@ -190,6 +192,7 @@ copy:
chunk_len_sum += chunk_len;
chunk_off = 0; /* modulo offset in recv ring buffer */
}
smc_rmb_sync_sg_for_device(conn);
/* update cursors */
if (!(flags & MSG_PEEK)) {