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-rw-r--r--net/rxrpc/ar-internal.h7
-rw-r--r--net/rxrpc/output.c50
-rw-r--r--net/rxrpc/rxkad.c13
-rw-r--r--net/rxrpc/sendmsg.c4
-rw-r--r--net/rxrpc/txbuf.c37
5 files changed, 54 insertions, 57 deletions
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index f251845fe532..5e740c486203 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -327,8 +327,8 @@ struct rxrpc_local {
* packet with a maximum set of jumbo subpackets or a PING ACK padded
* out to 64K with zeropages for PMTUD.
*/
- struct kvec kvec[RXRPC_MAX_NR_JUMBO > 3 + 16 ?
- RXRPC_MAX_NR_JUMBO : 3 + 16];
+ struct kvec kvec[1 + RXRPC_MAX_NR_JUMBO > 3 + 16 ?
+ 1 + RXRPC_MAX_NR_JUMBO : 3 + 16];
};
/*
@@ -874,8 +874,7 @@ struct rxrpc_txbuf {
#define RXRPC_TXBUF_RESENT 0x100 /* Set if has been resent */
__be16 cksum; /* Checksum to go in header */
bool jumboable; /* Can be non-terminal jumbo subpacket */
- u8 nr_kvec; /* Amount of kvec[] used */
- struct kvec kvec[1];
+ void *data; /* Data with preceding jumbo header */
};
static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 6f7a125d6e90..95905b85a8d7 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -428,13 +428,13 @@ int rxrpc_send_abort_packet(struct rxrpc_call *call)
static size_t rxrpc_prepare_data_subpacket(struct rxrpc_call *call,
struct rxrpc_send_data_req *req,
struct rxrpc_txbuf *txb,
+ struct rxrpc_wire_header *whdr,
rxrpc_serial_t serial, int subpkt)
{
- struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base;
- struct rxrpc_jumbo_header *jumbo = (void *)(whdr + 1) - sizeof(*jumbo);
+ struct rxrpc_jumbo_header *jumbo = txb->data - sizeof(*jumbo);
enum rxrpc_req_ack_trace why;
struct rxrpc_connection *conn = call->conn;
- struct kvec *kv = &call->local->kvec[subpkt];
+ struct kvec *kv = &call->local->kvec[1 + subpkt];
size_t len = txb->pkt_len;
bool last;
u8 flags;
@@ -491,18 +491,15 @@ static size_t rxrpc_prepare_data_subpacket(struct rxrpc_call *call,
}
dont_set_request_ack:
- /* The jumbo header overlays the wire header in the txbuf. */
+ /* There's a jumbo header prepended to the data if we need it. */
if (subpkt < req->n - 1)
flags |= RXRPC_JUMBO_PACKET;
else
flags &= ~RXRPC_JUMBO_PACKET;
if (subpkt == 0) {
whdr->flags = flags;
- whdr->serial = htonl(txb->serial);
whdr->cksum = txb->cksum;
- whdr->serviceId = htons(conn->service_id);
- kv->iov_base = whdr;
- len += sizeof(*whdr);
+ kv->iov_base = txb->data;
} else {
jumbo->flags = flags;
jumbo->pad = 0;
@@ -535,7 +532,9 @@ static unsigned int rxrpc_prepare_txqueue(struct rxrpc_txqueue *tq,
/*
* Prepare a (jumbo) packet for transmission.
*/
-static size_t rxrpc_prepare_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req)
+static size_t rxrpc_prepare_data_packet(struct rxrpc_call *call,
+ struct rxrpc_send_data_req *req,
+ struct rxrpc_wire_header *whdr)
{
struct rxrpc_txqueue *tq = req->tq;
rxrpc_serial_t serial;
@@ -549,6 +548,18 @@ static size_t rxrpc_prepare_data_packet(struct rxrpc_call *call, struct rxrpc_se
/* Each transmission of a Tx packet needs a new serial number */
serial = rxrpc_get_next_serials(call->conn, req->n);
+ whdr->epoch = htonl(call->conn->proto.epoch);
+ whdr->cid = htonl(call->cid);
+ whdr->callNumber = htonl(call->call_id);
+ whdr->seq = htonl(seq);
+ whdr->serial = htonl(serial);
+ whdr->type = RXRPC_PACKET_TYPE_DATA;
+ whdr->flags = 0;
+ whdr->userStatus = 0;
+ whdr->securityIndex = call->security_ix;
+ whdr->_rsvd = 0;
+ whdr->serviceId = htons(call->conn->service_id);
+
call->tx_last_serial = serial + req->n - 1;
call->tx_last_sent = req->now;
xmit_ts = rxrpc_prepare_txqueue(tq, req);
@@ -576,7 +587,7 @@ static size_t rxrpc_prepare_data_packet(struct rxrpc_call *call, struct rxrpc_se
if (i + 1 == req->n)
/* Only sample the last subpacket in a jumbo. */
__set_bit(ix, &tq->rtt_samples);
- len += rxrpc_prepare_data_subpacket(call, req, txb, serial, i);
+ len += rxrpc_prepare_data_subpacket(call, req, txb, whdr, serial, i);
serial++;
seq++;
i++;
@@ -618,6 +629,7 @@ static size_t rxrpc_prepare_data_packet(struct rxrpc_call *call, struct rxrpc_se
}
rxrpc_set_keepalive(call, req->now);
+ page_frag_free(whdr);
return len;
}
@@ -626,25 +638,33 @@ static size_t rxrpc_prepare_data_packet(struct rxrpc_call *call, struct rxrpc_se
*/
void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req)
{
+ struct rxrpc_wire_header *whdr;
struct rxrpc_connection *conn = call->conn;
enum rxrpc_tx_point frag;
struct rxrpc_txqueue *tq = req->tq;
struct rxrpc_txbuf *txb;
struct msghdr msg;
rxrpc_seq_t seq = req->seq;
- size_t len;
+ size_t len = sizeof(*whdr);
bool new_call = test_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags);
int ret, stat_ix;
_enter("%x,%x-%x", tq->qbase, seq, seq + req->n - 1);
+ whdr = page_frag_alloc(&call->local->tx_alloc, sizeof(*whdr), GFP_NOFS);
+ if (!whdr)
+ return; /* Drop the packet if no memory. */
+
+ call->local->kvec[0].iov_base = whdr;
+ call->local->kvec[0].iov_len = sizeof(*whdr);
+
stat_ix = umin(req->n, ARRAY_SIZE(call->rxnet->stat_tx_jumbo)) - 1;
atomic_inc(&call->rxnet->stat_tx_jumbo[stat_ix]);
- len = rxrpc_prepare_data_packet(call, req);
+ len += rxrpc_prepare_data_packet(call, req, whdr);
txb = tq->bufs[seq & RXRPC_TXQ_MASK];
- iov_iter_kvec(&msg.msg_iter, WRITE, call->local->kvec, req->n, len);
+ iov_iter_kvec(&msg.msg_iter, WRITE, call->local->kvec, 1 + req->n, len);
msg.msg_name = &call->peer->srx.transport;
msg.msg_namelen = call->peer->srx.transport_len;
@@ -695,13 +715,13 @@ void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req
if (ret == -EMSGSIZE) {
rxrpc_inc_stat(call->rxnet, stat_tx_data_send_msgsize);
- trace_rxrpc_tx_packet(call->debug_id, call->local->kvec[0].iov_base, frag);
+ trace_rxrpc_tx_packet(call->debug_id, whdr, frag);
ret = 0;
} else if (ret < 0) {
rxrpc_inc_stat(call->rxnet, stat_tx_data_send_fail);
trace_rxrpc_tx_fail(call->debug_id, txb->serial, ret, frag);
} else {
- trace_rxrpc_tx_packet(call->debug_id, call->local->kvec[0].iov_base, frag);
+ trace_rxrpc_tx_packet(call->debug_id, whdr, frag);
}
rxrpc_tx_backoff(call, ret);
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index 62b09d23ec08..6cb37b0eb77f 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -257,8 +257,7 @@ static int rxkad_secure_packet_auth(const struct rxrpc_call *call,
struct rxrpc_txbuf *txb,
struct skcipher_request *req)
{
- struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base;
- struct rxkad_level1_hdr *hdr = (void *)(whdr + 1);
+ struct rxkad_level1_hdr *hdr = txb->data;
struct rxrpc_crypt iv;
struct scatterlist sg;
size_t pad;
@@ -274,7 +273,7 @@ static int rxkad_secure_packet_auth(const struct rxrpc_call *call,
pad = RXKAD_ALIGN - pad;
pad &= RXKAD_ALIGN - 1;
if (pad) {
- memset(txb->kvec[0].iov_base + txb->offset, 0, pad);
+ memset(txb->data + txb->offset, 0, pad);
txb->pkt_len += pad;
}
@@ -300,8 +299,7 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,
struct skcipher_request *req)
{
const struct rxrpc_key_token *token;
- struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base;
- struct rxkad_level2_hdr *rxkhdr = (void *)(whdr + 1);
+ struct rxkad_level2_hdr *rxkhdr = txb->data;
struct rxrpc_crypt iv;
struct scatterlist sg;
size_t content, pad;
@@ -319,7 +317,7 @@ static int rxkad_secure_packet_encrypt(const struct rxrpc_call *call,
txb->pkt_len = round_up(content, RXKAD_ALIGN);
pad = txb->pkt_len - content;
if (pad)
- memset(txb->kvec[0].iov_base + txb->offset, 0, pad);
+ memset(txb->data + txb->offset, 0, pad);
/* encrypt from the session key */
token = call->conn->key->payload.data[0];
@@ -407,9 +405,8 @@ static int rxkad_secure_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb)
/* Clear excess space in the packet */
if (txb->pkt_len < txb->alloc_size) {
- struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base;
size_t gap = txb->alloc_size - txb->pkt_len;
- void *p = whdr + 1;
+ void *p = txb->data;
memset(p + txb->pkt_len, 0, gap);
}
diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 584397aba4a0..84dc6c94f23b 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -419,7 +419,7 @@ reload:
size_t copy = umin(txb->space, msg_data_left(msg));
_debug("add %zu", copy);
- if (!copy_from_iter_full(txb->kvec[0].iov_base + txb->offset,
+ if (!copy_from_iter_full(txb->data + txb->offset,
copy, &msg->msg_iter))
goto efault;
_debug("added");
@@ -445,8 +445,6 @@ reload:
ret = call->security->secure_packet(call, txb);
if (ret < 0)
goto out;
-
- txb->kvec[0].iov_len += txb->len;
rxrpc_queue_packet(rx, call, txb, notify_end_tx);
txb = NULL;
}
diff --git a/net/rxrpc/txbuf.c b/net/rxrpc/txbuf.c
index 131d9e55c8e9..c550991d48fa 100644
--- a/net/rxrpc/txbuf.c
+++ b/net/rxrpc/txbuf.c
@@ -19,17 +19,19 @@ atomic_t rxrpc_nr_txbuf;
struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size,
size_t data_align, gfp_t gfp)
{
- struct rxrpc_wire_header *whdr;
struct rxrpc_txbuf *txb;
- size_t total, hoff;
+ size_t total, doff, jsize = sizeof(struct rxrpc_jumbo_header);
void *buf;
txb = kzalloc(sizeof(*txb), gfp);
if (!txb)
return NULL;
- hoff = round_up(sizeof(*whdr), data_align) - sizeof(*whdr);
- total = hoff + sizeof(*whdr) + data_size;
+ /* We put a jumbo header in the buffer, but not a full wire header to
+ * avoid delayed-corruption problems with zerocopy.
+ */
+ doff = round_up(jsize, data_align);
+ total = doff + data_size;
data_align = umax(data_align, L1_CACHE_BYTES);
mutex_lock(&call->conn->tx_data_alloc_lock);
@@ -41,30 +43,15 @@ struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_
return NULL;
}
- whdr = buf + hoff;
-
refcount_set(&txb->ref, 1);
txb->call_debug_id = call->debug_id;
txb->debug_id = atomic_inc_return(&rxrpc_txbuf_debug_ids);
txb->alloc_size = data_size;
txb->space = data_size;
- txb->offset = sizeof(*whdr);
+ txb->offset = 0;
txb->flags = call->conn->out_clientflag;
txb->seq = call->send_top + 1;
- txb->nr_kvec = 1;
- txb->kvec[0].iov_base = whdr;
- txb->kvec[0].iov_len = sizeof(*whdr);
-
- whdr->epoch = htonl(call->conn->proto.epoch);
- whdr->cid = htonl(call->cid);
- whdr->callNumber = htonl(call->call_id);
- whdr->seq = htonl(txb->seq);
- whdr->type = RXRPC_PACKET_TYPE_DATA;
- whdr->flags = 0;
- whdr->userStatus = 0;
- whdr->securityIndex = call->security_ix;
- whdr->_rsvd = 0;
- whdr->serviceId = htons(call->dest_srx.srx_service);
+ txb->data = buf + doff;
trace_rxrpc_txbuf(txb->debug_id, txb->call_debug_id, txb->seq, 1,
rxrpc_txbuf_alloc_data);
@@ -90,14 +77,10 @@ void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what)
static void rxrpc_free_txbuf(struct rxrpc_txbuf *txb)
{
- int i;
-
trace_rxrpc_txbuf(txb->debug_id, txb->call_debug_id, txb->seq, 0,
rxrpc_txbuf_free);
- for (i = 0; i < txb->nr_kvec; i++)
- if (txb->kvec[i].iov_base &&
- !is_zero_pfn(page_to_pfn(virt_to_page(txb->kvec[i].iov_base))))
- page_frag_free(txb->kvec[i].iov_base);
+ if (txb->data)
+ page_frag_free(txb->data);
kfree(txb);
atomic_dec(&rxrpc_nr_txbuf);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.