int
ksocknal_lib_recv_kiov (ksock_conn_t *conn)
{
#if SOCKNAL_SINGLE_FRAG_RX || !SOCKNAL_RISK_KMAP_DEADLOCK
struct kvec scratch;
struct kvec *scratchiov = &scratch;
struct page **pages = NULL;
unsigned int niov = 1;
#else
#ifdef CONFIG_HIGHMEM
#warning "XXX risk of kmap deadlock on multiple frags..."
#endif
struct kvec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
struct page **pages = conn->ksnc_scheduler->kss_rx_scratch_pgs;
unsigned int niov = conn->ksnc_rx_nkiov;
#endif
lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
struct msghdr msg = {
.msg_flags = 0
};
int nob;
int i;
int rc;
void *base;
void *addr;
int sum;
int fragnob;
int n;
/* NB we can't trust socket ops to either consume our iovs
* or leave them alone. */
if ((addr = ksocknal_lib_kiov_vmap(kiov, niov, scratchiov, pages)) != NULL) {
nob = scratchiov[0].iov_len;
n = 1;
} else {
for (nob = i = 0; i < niov; i++) {
nob += scratchiov[i].iov_len = kiov[i].kiov_len;
scratchiov[i].iov_base = kmap(kiov[i].kiov_page) +
kiov[i].kiov_offset;
}
n = niov;
}
LASSERT (nob <= conn->ksnc_rx_nob_wanted);
rc = kernel_recvmsg(conn->ksnc_sock, &msg, scratchiov, n, nob,
MSG_DONTWAIT);
if (conn->ksnc_msg.ksm_csum != 0) {
for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {
LASSERT (i < niov);
/* Dang! have to kmap again because I have nowhere to stash the
* mapped address. But by doing it while the page is still
* mapped, the kernel just bumps the map count and returns me
* the address it stashed. */
base = kmap(kiov[i].kiov_page) + kiov[i].kiov_offset;
fragnob = kiov[i].kiov_len;
if (fragnob > sum)
fragnob = sum;
conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum,
base, fragnob);
kunmap(kiov[i].kiov_page);
}
}
if (addr != NULL) {
ksocknal_lib_kiov_vunmap(addr);
} else {
for (i = 0; i < niov; i++)
kunmap(kiov[i].kiov_page);
}
return (rc);
}
void
ksocknal_lib_csum_tx(ksock_tx_t *tx)
{
int i;
__u32 csum;
void *base;
LASSERT(tx->tx_iov[0].iov_base == (void *)&tx->tx_msg);
LASSERT(tx->tx_conn != NULL);
LASSERT(tx->tx_conn->ksnc_proto == &ksocknal_protocol_v2x);
tx->tx_msg.ksm_csum = 0;
csum = ksocknal_csum(~0, (void *)tx->tx_iov[0].iov_base,
tx->tx_iov[0].iov_len);
if (tx->tx_kiov != NULL) {
for (i = 0; i < tx->tx_nkiov; i++) {
base = kmap(tx->tx_kiov[i].kiov_page) +
tx->tx_kiov[i].kiov_offset;
csum = ksocknal_csum(csum, base, tx->tx_kiov[i].kiov_len);
kunmap(tx->tx_kiov[i].kiov_page);
}
} else {
for (i = 1; i < tx->tx_niov; i++)
csum = ksocknal_csum(csum, tx->tx_iov[i].iov_base,
tx->tx_iov[i].iov_len);
}
if (*ksocknal_tunables.ksnd_inject_csum_error) {
csum++;
*ksocknal_tunables.ksnd_inject_csum_error = 0;
}
tx->tx_msg.ksm_csum = csum;
}
int
ksocknal_lib_send_iov (ksock_conn_t *conn, ksock_tx_t *tx)
{
struct socket *sock = conn->ksnc_sock;
int nob;
int rc;
if (*ksocknal_tunables.ksnd_enable_csum && /* checksum enabled */
conn->ksnc_proto == &ksocknal_protocol_v2x && /* V2.x connection */
tx->tx_nob == tx->tx_resid && /* frist sending */
tx->tx_msg.ksm_csum == 0) /* not checksummed */
ksocknal_lib_csum_tx(tx);
/* NB we can't trust socket ops to either consume our iovs
* or leave them alone. */
{
#if SOCKNAL_SINGLE_FRAG_TX
struct iovec scratch;
struct iovec *scratchiov = &scratch;
unsigned int niov = 1;
#else
struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
unsigned int niov = tx->tx_niov;
#endif
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_iovlen = niov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = MSG_DONTWAIT
};
mm_segment_t oldmm = get_fs();
int i;
for (nob = i = 0; i < niov; i++) {
scratchiov[i] = tx->tx_iov[i];
nob += scratchiov[i].iov_len;
}
if (!cfs_list_empty(&conn->ksnc_tx_queue) ||
nob < tx->tx_resid)
msg.msg_flags |= MSG_MORE;
set_fs (KERNEL_DS);
rc = sock_sendmsg(sock, &msg, nob);
set_fs (oldmm);
}
return rc;
}
int
ksocknal_lib_send_kiov (ksock_conn_t *conn, ksock_tx_t *tx)
{
struct socket *sock = conn->ksnc_sock;
lnet_kiov_t *kiov = tx->tx_kiov;
int rc;
int nob;
/* Not NOOP message */
LASSERT (tx->tx_lnetmsg != NULL);
/* NB we can't trust socket ops to either consume our iovs
* or leave them alone. */
if (tx->tx_msg.ksm_zc_cookies[0] != 0) {
/* Zero copy is enabled */
struct sock *sk = sock->sk;
struct page *page = kiov->kiov_page;
int offset = kiov->kiov_offset;
int fragsize = kiov->kiov_len;
int msgflg = MSG_DONTWAIT;
CDEBUG(D_NET, "page %p + offset %x for %d\n",
page, offset, kiov->kiov_len);
if (!cfs_list_empty(&conn->ksnc_tx_queue) ||
fragsize < tx->tx_resid)
msgflg |= MSG_MORE;
if (sk->sk_prot->sendpage != NULL) {
rc = sk->sk_prot->sendpage(sk, page,
offset, fragsize, msgflg);
} else {
rc = cfs_tcp_sendpage(sk, page, offset, fragsize,
msgflg);
}
} else {
#if SOCKNAL_SINGLE_FRAG_TX || !SOCKNAL_RISK_KMAP_DEADLOCK
struct iovec scratch;
struct iovec *scratchiov = &scratch;
unsigned int niov = 1;
#else
#ifdef CONFIG_HIGHMEM
#warning "XXX risk of kmap deadlock on multiple frags..."
#endif
struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
unsigned int niov = tx->tx_nkiov;
#endif
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_iovlen = niov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = MSG_DONTWAIT
};
mm_segment_t oldmm = get_fs();
int i;
for (nob = i = 0; i < niov; i++) {
scratchiov[i].iov_base = kmap(kiov[i].kiov_page) +
kiov[i].kiov_offset;
nob += scratchiov[i].iov_len = kiov[i].kiov_len;
}
if (!cfs_list_empty(&conn->ksnc_tx_queue) ||
nob < tx->tx_resid)
msg.msg_flags |= MSG_MORE;
set_fs (KERNEL_DS);
rc = sock_sendmsg(sock, &msg, nob);
set_fs (oldmm);
for (i = 0; i < niov; i++)
kunmap(kiov[i].kiov_page);
}
return rc;
}
void
ksocknal_lib_eager_ack (ksock_conn_t *conn)
{
int opt = 1;
mm_segment_t oldmm = get_fs();
struct socket *sock = conn->ksnc_sock;
/* Remind the socket to ACK eagerly. If I don't, the socket might
* think I'm about to send something it could piggy-back the ACK
* on, introducing delay in completing zero-copy sends in my
* peer. */
set_fs(KERNEL_DS);
sock->ops->setsockopt (sock, SOL_TCP, TCP_QUICKACK,
(char *)&opt, sizeof (opt));
set_fs(oldmm);
}
int
ksocknal_lib_recv_iov (ksock_conn_t *conn)
{
#if SOCKNAL_SINGLE_FRAG_RX
struct iovec scratch;
struct iovec *scratchiov = &scratch;
unsigned int niov = 1;
#else
struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
unsigned int niov = conn->ksnc_rx_niov;
#endif
struct iovec *iov = conn->ksnc_rx_iov;
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_iovlen = niov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0
};
mm_segment_t oldmm = get_fs();
int nob;
int i;
int rc;
int fragnob;
int sum;
__u32 saved_csum;
/* NB we can't trust socket ops to either consume our iovs
* or leave them alone. */
LASSERT (niov > 0);
for (nob = i = 0; i < niov; i++) {
scratchiov[i] = iov[i];
nob += scratchiov[i].iov_len;
}
LASSERT (nob <= conn->ksnc_rx_nob_wanted);
set_fs (KERNEL_DS);
rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
/* NB this is just a boolean..........................^ */
set_fs (oldmm);
saved_csum = 0;
if (conn->ksnc_proto == &ksocknal_protocol_v2x) {
saved_csum = conn->ksnc_msg.ksm_csum;
conn->ksnc_msg.ksm_csum = 0;
}
if (saved_csum != 0) {
/* accumulate checksum */
for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {
LASSERT (i < niov);
fragnob = iov[i].iov_len;
if (fragnob > sum)
fragnob = sum;
conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum,
iov[i].iov_base, fragnob);
}
conn->ksnc_msg.ksm_csum = saved_csum;
}
return rc;
}
static void
ksocknal_lib_kiov_vunmap(void *addr)
{
if (addr == NULL)
return;
vunmap(addr);
}
static void *
ksocknal_lib_kiov_vmap(lnet_kiov_t *kiov, int niov,
struct iovec *iov, struct page **pages)
{
void *addr;
int nob;
int i;
if (!*ksocknal_tunables.ksnd_zc_recv || pages == NULL)
return NULL;
LASSERT (niov <= LNET_MAX_IOV);
if (niov < 2 ||
niov < *ksocknal_tunables.ksnd_zc_recv_min_nfrags)
return NULL;
for (nob = i = 0; i < niov; i++) {
if ((kiov[i].kiov_offset != 0 && i > 0) ||
(kiov[i].kiov_offset + kiov[i].kiov_len != CFS_PAGE_SIZE && i < niov - 1))
return NULL;
pages[i] = kiov[i].kiov_page;
nob += kiov[i].kiov_len;
}
addr = vmap(pages, niov, VM_MAP, PAGE_KERNEL);
if (addr == NULL)
return NULL;
iov->iov_base = addr + kiov[0].kiov_offset;
iov->iov_len = nob;
return addr;
}
int
ksocknal_lib_recv_kiov (ksock_conn_t *conn)
{
#if SOCKNAL_SINGLE_FRAG_RX || !SOCKNAL_RISK_KMAP_DEADLOCK
struct iovec scratch;
struct iovec *scratchiov = &scratch;
struct page **pages = NULL;
unsigned int niov = 1;
#else
#ifdef CONFIG_HIGHMEM
#warning "XXX risk of kmap deadlock on multiple frags..."
#endif
struct iovec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
struct page **pages = conn->ksnc_scheduler->kss_rx_scratch_pgs;
unsigned int niov = conn->ksnc_rx_nkiov;
#endif
lnet_kiov_t *kiov = conn->ksnc_rx_kiov;
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = scratchiov,
.msg_control = NULL,
.msg_controllen = 0,
.msg_flags = 0
};
mm_segment_t oldmm = get_fs();
int nob;
int i;
int rc;
void *base;
void *addr;
int sum;
int fragnob;
/* NB we can't trust socket ops to either consume our iovs
* or leave them alone. */
if ((addr = ksocknal_lib_kiov_vmap(kiov, niov, scratchiov, pages)) != NULL) {
nob = scratchiov[0].iov_len;
msg.msg_iovlen = 1;
} else {
for (nob = i = 0; i < niov; i++) {
nob += scratchiov[i].iov_len = kiov[i].kiov_len;
scratchiov[i].iov_base = kmap(kiov[i].kiov_page) +
kiov[i].kiov_offset;
}
msg.msg_iovlen = niov;
}
LASSERT (nob <= conn->ksnc_rx_nob_wanted);
set_fs (KERNEL_DS);
rc = sock_recvmsg (conn->ksnc_sock, &msg, nob, MSG_DONTWAIT);
/* NB this is just a boolean.......................^ */
set_fs (oldmm);
if (conn->ksnc_msg.ksm_csum != 0) {
for (i = 0, sum = rc; sum > 0; i++, sum -= fragnob) {
LASSERT (i < niov);
/* Dang! have to kmap again because I have nowhere to stash the
* mapped address. But by doing it while the page is still
* mapped, the kernel just bumps the map count and returns me
* the address it stashed. */
base = kmap(kiov[i].kiov_page) + kiov[i].kiov_offset;
fragnob = kiov[i].kiov_len;
if (fragnob > sum)
fragnob = sum;
conn->ksnc_rx_csum = ksocknal_csum(conn->ksnc_rx_csum,
base, fragnob);
kunmap(kiov[i].kiov_page);
}
}
if (addr != NULL) {
ksocknal_lib_kiov_vunmap(addr);
} else {
for (i = 0; i < niov; i++)
kunmap(kiov[i].kiov_page);
}
return (rc);
}
void
ksocknal_lib_csum_tx(ksock_tx_t *tx)
{
int i;
__u32 csum;
void *base;
LASSERT(tx->tx_iov[0].iov_base == (void *)&tx->tx_msg);
LASSERT(tx->tx_conn != NULL);
LASSERT(tx->tx_conn->ksnc_proto == &ksocknal_protocol_v2x);
tx->tx_msg.ksm_csum = 0;
csum = ksocknal_csum(~0, (void *)tx->tx_iov[0].iov_base,
tx->tx_iov[0].iov_len);
if (tx->tx_kiov != NULL) {
for (i = 0; i < tx->tx_nkiov; i++) {
base = kmap(tx->tx_kiov[i].kiov_page) +
tx->tx_kiov[i].kiov_offset;
csum = ksocknal_csum(csum, base, tx->tx_kiov[i].kiov_len);
kunmap(tx->tx_kiov[i].kiov_page);
}
} else {
for (i = 1; i < tx->tx_niov; i++)
csum = ksocknal_csum(csum, tx->tx_iov[i].iov_base,
tx->tx_iov[i].iov_len);
}
if (*ksocknal_tunables.ksnd_inject_csum_error) {
csum++;
*ksocknal_tunables.ksnd_inject_csum_error = 0;
}
tx->tx_msg.ksm_csum = csum;
}
int
ksocknal_lib_get_conn_tunables (ksock_conn_t *conn, int *txmem, int *rxmem, int *nagle)
{
mm_segment_t oldmm = get_fs ();
struct socket *sock = conn->ksnc_sock;
int len;
int rc;
rc = ksocknal_connsock_addref(conn);
if (rc != 0) {
LASSERT (conn->ksnc_closing);
*txmem = *rxmem = *nagle = 0;
return (-ESHUTDOWN);
}
rc = libcfs_sock_getbuf(sock, txmem, rxmem);
if (rc == 0) {
len = sizeof(*nagle);
set_fs(KERNEL_DS);
rc = sock->ops->getsockopt(sock, SOL_TCP, TCP_NODELAY,
(char *)nagle, &len);
set_fs(oldmm);
}
ksocknal_connsock_decref(conn);
if (rc == 0)
*nagle = !*nagle;
else
*txmem = *rxmem = *nagle = 0;
return (rc);
}