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Message-Id: <1522339074-4681-10-git-send-email-atul.gupta@chelsio.com>
Date: Thu, 29 Mar 2018 21:27:51 +0530
From: Atul Gupta <atul.gupta@...lsio.com>
To: davem@...emloft.net, herbert@...dor.apana.org.au
Cc: davejwatson@...com, sd@...asysnail.net, sbrivio@...hat.com,
linux-crypto@...r.kernel.org, netdev@...r.kernel.org,
werner@...lsio.com, leedom@...lsio.com,
swise@...ngridcomputing.com, indranil@...lsio.com,
ganeshgr@...lsio.com, atul.gupta@...lsio.com
Subject: [PATCH v14 net-next 09/12] crypto: chtls - Inline TLS record Tx
TLS handler for record transmit.
Create Inline TLS work request and post to FW.
Create Inline TLS record CPLs for hardware
Signed-off-by: Atul Gupta <atul.gupta@...lsio.com>
Signed-off-by: Michael Werner <werner@...lsio.com>
---
drivers/crypto/chelsio/chtls/chtls_io.c | 1248 +++++++++++++++++++++++++++++++
1 file changed, 1248 insertions(+)
create mode 100644 drivers/crypto/chelsio/chtls/chtls_io.c
diff --git a/drivers/crypto/chelsio/chtls/chtls_io.c b/drivers/crypto/chelsio/chtls/chtls_io.c
new file mode 100644
index 0000000..4bc60cf
--- /dev/null
+++ b/drivers/crypto/chelsio/chtls/chtls_io.c
@@ -0,0 +1,1248 @@
+/*
+ * Copyright (c) 2018 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Written by: Atul Gupta (atul.gupta@...lsio.com)
+ */
+
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/skbuff.h>
+#include <linux/timer.h>
+#include <linux/notifier.h>
+#include <linux/inetdevice.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/sched/signal.h>
+#include <net/tcp.h>
+#include <net/busy_poll.h>
+#include <crypto/aes.h>
+
+#include "chtls.h"
+#include "chtls_cm.h"
+
+static bool is_tls_rx(struct chtls_sock *csk)
+{
+ return csk->tlshws.rxkey >= 0;
+}
+
+static bool is_tls_tx(struct chtls_sock *csk)
+{
+ return csk->tlshws.txkey >= 0;
+}
+
+static int data_sgl_len(const struct sk_buff *skb)
+{
+ unsigned int cnt;
+
+ cnt = skb_shinfo(skb)->nr_frags;
+ return sgl_len(cnt) * 8;
+}
+
+static int nos_ivs(struct sock *sk, unsigned int size)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+
+ return DIV_ROUND_UP(size, csk->tlshws.mfs);
+}
+
+static int set_ivs_imm(struct sock *sk, const struct sk_buff *skb)
+{
+ int ivs_size = nos_ivs(sk, skb->len) * CIPHER_BLOCK_SIZE;
+ int hlen = TLS_WR_CPL_LEN + data_sgl_len(skb);
+
+ if ((hlen + KEY_ON_MEM_SZ + ivs_size) <
+ MAX_IMM_OFLD_TX_DATA_WR_LEN) {
+ ULP_SKB_CB(skb)->ulp.tls.iv = 1;
+ return 1;
+ }
+ ULP_SKB_CB(skb)->ulp.tls.iv = 0;
+ return 0;
+}
+
+static int max_ivs_size(struct sock *sk, int size)
+{
+ return nos_ivs(sk, size) * CIPHER_BLOCK_SIZE;
+}
+
+static int ivs_size(struct sock *sk, const struct sk_buff *skb)
+{
+ return set_ivs_imm(sk, skb) ? (nos_ivs(sk, skb->len) *
+ CIPHER_BLOCK_SIZE) : 0;
+}
+
+static int flowc_wr_credits(int nparams, int *flowclenp)
+{
+ int flowclen16, flowclen;
+
+ flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
+ flowclen16 = DIV_ROUND_UP(flowclen, 16);
+ flowclen = flowclen16 * 16;
+
+ if (flowclenp)
+ *flowclenp = flowclen;
+
+ return flowclen16;
+}
+
+static struct sk_buff *create_flowc_wr_skb(struct sock *sk,
+ struct fw_flowc_wr *flowc,
+ int flowclen)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct sk_buff *skb;
+
+ skb = alloc_skb(flowclen, GFP_ATOMIC);
+ if (!skb)
+ return NULL;
+
+ memcpy(__skb_put(skb, flowclen), flowc, flowclen);
+ skb_set_queue_mapping(skb, (csk->txq_idx << 1) | CPL_PRIORITY_DATA);
+
+ return skb;
+}
+
+static int send_flowc_wr(struct sock *sk, struct fw_flowc_wr *flowc,
+ int flowclen)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
+ int flowclen16 = flowclen / 16;
+ struct sk_buff *skb;
+ int ret;
+
+ if (csk_flag(sk, CSK_TX_DATA_SENT)) {
+ skb = create_flowc_wr_skb(sk, flowc, flowclen);
+ if (!skb)
+ return -ENOMEM;
+
+ skb_entail(sk, skb,
+ ULPCB_FLAG_NO_HDR | ULPCB_FLAG_NO_APPEND);
+ return 0;
+ }
+
+ ret = cxgb4_immdata_send(csk->egress_dev,
+ csk->txq_idx,
+ flowc, flowclen);
+ if (!ret)
+ return flowclen16;
+ skb = create_flowc_wr_skb(sk, flowc, flowclen);
+ if (!skb)
+ return -ENOMEM;
+ send_or_defer(sk, tp, skb, 0);
+ return flowclen16;
+}
+
+static u8 tcp_state_to_flowc_state(u8 state)
+{
+ switch (state) {
+ case TCP_ESTABLISHED:
+ return FW_FLOWC_MNEM_TCPSTATE_ESTABLISHED;
+ case TCP_CLOSE_WAIT:
+ return FW_FLOWC_MNEM_TCPSTATE_CLOSEWAIT;
+ case TCP_FIN_WAIT1:
+ return FW_FLOWC_MNEM_TCPSTATE_FINWAIT1;
+ case TCP_CLOSING:
+ return FW_FLOWC_MNEM_TCPSTATE_CLOSING;
+ case TCP_LAST_ACK:
+ return FW_FLOWC_MNEM_TCPSTATE_LASTACK;
+ case TCP_FIN_WAIT2:
+ return FW_FLOWC_MNEM_TCPSTATE_FINWAIT2;
+ }
+
+ return FW_FLOWC_MNEM_TCPSTATE_ESTABLISHED;
+}
+
+int send_tx_flowc_wr(struct sock *sk, int compl,
+ u32 snd_nxt, u32 rcv_nxt)
+{
+ struct flowc_packed {
+ struct fw_flowc_wr fc;
+ struct fw_flowc_mnemval mnemval[FW_FLOWC_MNEM_MAX];
+ } __packed sflowc;
+ int nparams, paramidx, flowclen16, flowclen;
+ struct fw_flowc_wr *flowc;
+ struct chtls_sock *csk;
+ struct tcp_sock *tp;
+
+ csk = rcu_dereference_sk_user_data(sk);
+ tp = tcp_sk(sk);
+ memset(&sflowc, 0, sizeof(sflowc));
+ flowc = &sflowc.fc;
+
+#define FLOWC_PARAM(__m, __v) \
+ do { \
+ flowc->mnemval[paramidx].mnemonic = FW_FLOWC_MNEM_##__m; \
+ flowc->mnemval[paramidx].val = cpu_to_be32(__v); \
+ paramidx++; \
+ } while (0)
+
+ paramidx = 0;
+
+ FLOWC_PARAM(PFNVFN, FW_PFVF_CMD_PFN_V(csk->cdev->lldi->pf));
+ FLOWC_PARAM(CH, csk->tx_chan);
+ FLOWC_PARAM(PORT, csk->tx_chan);
+ FLOWC_PARAM(IQID, csk->rss_qid);
+ FLOWC_PARAM(SNDNXT, tp->snd_nxt);
+ FLOWC_PARAM(RCVNXT, tp->rcv_nxt);
+ FLOWC_PARAM(SNDBUF, csk->sndbuf);
+ FLOWC_PARAM(MSS, tp->mss_cache);
+ FLOWC_PARAM(TCPSTATE, tcp_state_to_flowc_state(sk->sk_state));
+
+ if (SND_WSCALE(tp))
+ FLOWC_PARAM(RCV_SCALE, SND_WSCALE(tp));
+
+ if (csk->ulp_mode == ULP_MODE_TLS)
+ FLOWC_PARAM(ULD_MODE, ULP_MODE_TLS);
+
+ if (csk->tlshws.fcplenmax)
+ FLOWC_PARAM(TXDATAPLEN_MAX, csk->tlshws.fcplenmax);
+
+ nparams = paramidx;
+#undef FLOWC_PARAM
+
+ flowclen16 = flowc_wr_credits(nparams, &flowclen);
+ flowc->op_to_nparams =
+ cpu_to_be32(FW_WR_OP_V(FW_FLOWC_WR) |
+ FW_WR_COMPL_V(compl) |
+ FW_FLOWC_WR_NPARAMS_V(nparams));
+ flowc->flowid_len16 = cpu_to_be32(FW_WR_LEN16_V(flowclen16) |
+ FW_WR_FLOWID_V(csk->tid));
+
+ return send_flowc_wr(sk, flowc, flowclen);
+}
+
+/* Copy IVs to WR */
+static int tls_copy_ivs(struct sock *sk, struct sk_buff *skb)
+
+{
+ struct chtls_sock *csk;
+ unsigned char *iv_loc;
+ struct chtls_hws *hws;
+ unsigned char *ivs;
+ u16 number_of_ivs;
+ struct page *page;
+ int err = 0;
+
+ csk = rcu_dereference_sk_user_data(sk);
+ hws = &csk->tlshws;
+ number_of_ivs = nos_ivs(sk, skb->len);
+
+ if (number_of_ivs > MAX_IVS_PAGE) {
+ pr_warn("MAX IVs in PAGE exceeded %d\n", number_of_ivs);
+ return -ENOMEM;
+ }
+
+ /* generate the IVs */
+ ivs = kmalloc(number_of_ivs * CIPHER_BLOCK_SIZE, GFP_ATOMIC);
+ if (!ivs)
+ return -ENOMEM;
+ get_random_bytes(ivs, number_of_ivs * CIPHER_BLOCK_SIZE);
+
+ if (skb_ulp_tls_iv_imm(skb)) {
+ /* send the IVs as immediate data in the WR */
+ iv_loc = (unsigned char *)__skb_push(skb, number_of_ivs *
+ CIPHER_BLOCK_SIZE);
+ if (iv_loc)
+ memcpy(iv_loc, ivs, number_of_ivs * CIPHER_BLOCK_SIZE);
+
+ hws->ivsize = number_of_ivs * CIPHER_BLOCK_SIZE;
+ } else {
+ /* Send the IVs as sgls */
+ /* Already accounted IV DSGL for credits */
+ skb_shinfo(skb)->nr_frags--;
+ page = alloc_pages(sk->sk_allocation | __GFP_COMP, 0);
+ if (!page) {
+ pr_info("%s : Page allocation for IVs failed\n",
+ __func__);
+ err = -ENOMEM;
+ goto out;
+ }
+ memcpy(page_address(page), ivs, number_of_ivs *
+ CIPHER_BLOCK_SIZE);
+ skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, 0,
+ number_of_ivs * CIPHER_BLOCK_SIZE);
+ hws->ivsize = 0;
+ }
+out:
+ kfree(ivs);
+ return err;
+}
+
+/* Copy Key to WR */
+static void tls_copy_tx_key(struct sock *sk, struct sk_buff *skb)
+{
+ struct ulptx_sc_memrd *sc_memrd;
+ struct chtls_sock *csk;
+ struct chtls_dev *cdev;
+ struct ulptx_idata *sc;
+ struct chtls_hws *hws;
+ u32 immdlen;
+ int kaddr;
+
+ csk = rcu_dereference_sk_user_data(sk);
+ hws = &csk->tlshws;
+ cdev = csk->cdev;
+
+ immdlen = sizeof(*sc) + sizeof(*sc_memrd);
+ kaddr = keyid_to_addr(cdev->kmap.start, hws->txkey);
+ sc = (struct ulptx_idata *)__skb_push(skb, immdlen);
+ if (sc) {
+ sc->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_NOOP));
+ sc->len = htonl(0);
+ sc_memrd = (struct ulptx_sc_memrd *)(sc + 1);
+ sc_memrd->cmd_to_len =
+ htonl(ULPTX_CMD_V(ULP_TX_SC_MEMRD) |
+ ULP_TX_SC_MORE_V(1) |
+ ULPTX_LEN16_V(hws->keylen >> 4));
+ sc_memrd->addr = htonl(kaddr);
+ }
+}
+
+static u64 tlstx_incr_seqnum(struct chtls_hws *hws)
+{
+ return hws->tx_seq_no++;
+}
+
+static bool is_sg_request(const struct sk_buff *skb)
+{
+ return skb->peeked ||
+ (skb->len > MAX_IMM_ULPTX_WR_LEN);
+}
+
+/*
+ * Returns true if an sk_buff carries urgent data.
+ */
+static bool skb_urgent(struct sk_buff *skb)
+{
+ return ULP_SKB_CB(skb)->flags & ULPCB_FLAG_URG;
+}
+
+/* TLS content type for CPL SFO */
+static unsigned char tls_content_type(unsigned char content_type)
+{
+ switch (content_type) {
+ case TLS_HDR_TYPE_CCS:
+ return CPL_TX_TLS_SFO_TYPE_CCS;
+ case TLS_HDR_TYPE_ALERT:
+ return CPL_TX_TLS_SFO_TYPE_ALERT;
+ case TLS_HDR_TYPE_HANDSHAKE:
+ return CPL_TX_TLS_SFO_TYPE_HANDSHAKE;
+ case TLS_HDR_TYPE_HEARTBEAT:
+ return CPL_TX_TLS_SFO_TYPE_HEARTBEAT;
+ }
+ return CPL_TX_TLS_SFO_TYPE_DATA;
+}
+
+static void tls_tx_data_wr(struct sock *sk, struct sk_buff *skb,
+ int dlen, int tls_immd, u32 credits,
+ int expn, int pdus)
+{
+ struct fw_tlstx_data_wr *req_wr;
+ struct cpl_tx_tls_sfo *req_cpl;
+ unsigned int wr_ulp_mode_force;
+ struct tls_scmd *updated_scmd;
+ unsigned char data_type;
+ struct chtls_sock *csk;
+ struct net_device *dev;
+ struct chtls_hws *hws;
+ struct tls_scmd *scmd;
+ struct adapter *adap;
+ unsigned char *req;
+ int immd_len;
+ int iv_imm;
+ int len;
+
+ csk = rcu_dereference_sk_user_data(sk);
+ iv_imm = skb_ulp_tls_iv_imm(skb);
+ dev = csk->egress_dev;
+ adap = netdev2adap(dev);
+ hws = &csk->tlshws;
+ scmd = &hws->scmd;
+ len = dlen + expn;
+
+ dlen = (dlen < hws->mfs) ? dlen : hws->mfs;
+ atomic_inc(&adap->chcr_stats.tls_pdu_tx);
+
+ updated_scmd = scmd;
+ updated_scmd->seqno_numivs &= 0xffffff80;
+ updated_scmd->seqno_numivs |= SCMD_NUM_IVS_V(pdus);
+ hws->scmd = *updated_scmd;
+
+ req = (unsigned char *)__skb_push(skb, sizeof(struct cpl_tx_tls_sfo));
+ req_cpl = (struct cpl_tx_tls_sfo *)req;
+ req = (unsigned char *)__skb_push(skb, (sizeof(struct
+ fw_tlstx_data_wr)));
+
+ req_wr = (struct fw_tlstx_data_wr *)req;
+ immd_len = (tls_immd ? dlen : 0);
+ req_wr->op_to_immdlen =
+ htonl(FW_WR_OP_V(FW_TLSTX_DATA_WR) |
+ FW_TLSTX_DATA_WR_COMPL_V(1) |
+ FW_TLSTX_DATA_WR_IMMDLEN_V(immd_len));
+ req_wr->flowid_len16 = htonl(FW_TLSTX_DATA_WR_FLOWID_V(csk->tid) |
+ FW_TLSTX_DATA_WR_LEN16_V(credits));
+ wr_ulp_mode_force = TX_ULP_MODE_V(ULP_MODE_TLS);
+
+ if (is_sg_request(skb))
+ wr_ulp_mode_force |= FW_OFLD_TX_DATA_WR_ALIGNPLD_F |
+ ((tcp_sk(sk)->nonagle & TCP_NAGLE_OFF) ? 0 :
+ FW_OFLD_TX_DATA_WR_SHOVE_F);
+
+ req_wr->lsodisable_to_flags =
+ htonl(TX_ULP_MODE_V(ULP_MODE_TLS) |
+ FW_OFLD_TX_DATA_WR_URGENT_V(skb_urgent(skb)) |
+ T6_TX_FORCE_F | wr_ulp_mode_force |
+ TX_SHOVE_V((!csk_flag(sk, CSK_TX_MORE_DATA)) &&
+ skb_queue_empty(&csk->txq)));
+
+ req_wr->ctxloc_to_exp =
+ htonl(FW_TLSTX_DATA_WR_NUMIVS_V(pdus) |
+ FW_TLSTX_DATA_WR_EXP_V(expn) |
+ FW_TLSTX_DATA_WR_CTXLOC_V(CHTLS_KEY_CONTEXT_DDR) |
+ FW_TLSTX_DATA_WR_IVDSGL_V(!iv_imm) |
+ FW_TLSTX_DATA_WR_KEYSIZE_V(hws->keylen >> 4));
+
+ /* Fill in the length */
+ req_wr->plen = htonl(len);
+ req_wr->mfs = htons(hws->mfs);
+ req_wr->adjustedplen_pkd =
+ htons(FW_TLSTX_DATA_WR_ADJUSTEDPLEN_V(hws->adjustlen));
+ req_wr->expinplenmax_pkd =
+ htons(FW_TLSTX_DATA_WR_EXPINPLENMAX_V(hws->expansion));
+ req_wr->pdusinplenmax_pkd =
+ FW_TLSTX_DATA_WR_PDUSINPLENMAX_V(hws->pdus);
+ req_wr->r10 = 0;
+
+ data_type = tls_content_type(ULP_SKB_CB(skb)->ulp.tls.type);
+ req_cpl->op_to_seg_len = htonl(CPL_TX_TLS_SFO_OPCODE_V(CPL_TX_TLS_SFO) |
+ CPL_TX_TLS_SFO_DATA_TYPE_V(data_type) |
+ CPL_TX_TLS_SFO_CPL_LEN_V(2) |
+ CPL_TX_TLS_SFO_SEG_LEN_V(dlen));
+ req_cpl->pld_len = htonl(len - expn);
+
+ req_cpl->type_protover = htonl(CPL_TX_TLS_SFO_TYPE_V
+ ((data_type == CPL_TX_TLS_SFO_TYPE_HEARTBEAT) ?
+ TLS_HDR_TYPE_HEARTBEAT : 0) |
+ CPL_TX_TLS_SFO_PROTOVER_V(0));
+
+ /* create the s-command */
+ req_cpl->r1_lo = 0;
+ req_cpl->seqno_numivs = cpu_to_be32(hws->scmd.seqno_numivs);
+ req_cpl->ivgen_hdrlen = cpu_to_be32(hws->scmd.ivgen_hdrlen);
+ req_cpl->scmd1 = cpu_to_be64(tlstx_incr_seqnum(hws));
+}
+
+/*
+ * Calculate the TLS data expansion size
+ */
+static int chtls_expansion_size(struct sock *sk, int data_len,
+ int fullpdu,
+ unsigned short *pducnt)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct chtls_hws *hws = &csk->tlshws;
+ struct tls_scmd *scmd = &hws->scmd;
+ int fragsize = hws->mfs;
+ int expnsize = 0;
+ int fragleft;
+ int fragcnt;
+ int expppdu;
+
+ if (SCMD_CIPH_MODE_G(scmd->seqno_numivs) ==
+ SCMD_CIPH_MODE_AES_GCM) {
+ expppdu = GCM_TAG_SIZE + AEAD_EXPLICIT_DATA_SIZE +
+ TLS_HEADER_LENGTH;
+
+ if (fullpdu) {
+ *pducnt = data_len / (expppdu + fragsize);
+ if (*pducnt > 32)
+ *pducnt = 32;
+ else if (!*pducnt)
+ *pducnt = 1;
+ expnsize = (*pducnt) * expppdu;
+ return expnsize;
+ }
+ fragcnt = (data_len / fragsize);
+ expnsize = fragcnt * expppdu;
+ fragleft = data_len % fragsize;
+ if (fragleft > 0)
+ expnsize += expppdu;
+ }
+ return expnsize;
+}
+
+/* WR with IV, KEY and CPL SFO added */
+static void make_tlstx_data_wr(struct sock *sk, struct sk_buff *skb,
+ int tls_tx_imm, int tls_len, u32 credits)
+{
+ unsigned short pdus_per_ulp = 0;
+ struct chtls_sock *csk;
+ struct chtls_hws *hws;
+ int expn_sz;
+ int pdus;
+
+ csk = rcu_dereference_sk_user_data(sk);
+ hws = &csk->tlshws;
+ pdus = DIV_ROUND_UP(tls_len, hws->mfs);
+ expn_sz = chtls_expansion_size(sk, tls_len, 0, NULL);
+ if (!hws->compute) {
+ hws->expansion = chtls_expansion_size(sk,
+ hws->fcplenmax,
+ 1, &pdus_per_ulp);
+ hws->pdus = pdus_per_ulp;
+ hws->adjustlen = hws->pdus *
+ ((hws->expansion / hws->pdus) + hws->mfs);
+ hws->compute = 1;
+ }
+ if (tls_copy_ivs(sk, skb))
+ return;
+ tls_copy_tx_key(sk, skb);
+ tls_tx_data_wr(sk, skb, tls_len, tls_tx_imm, credits, expn_sz, pdus);
+ hws->tx_seq_no += (pdus - 1);
+}
+
+static void make_tx_data_wr(struct sock *sk, struct sk_buff *skb,
+ unsigned int immdlen, int len,
+ u32 credits, u32 compl)
+{
+ struct fw_ofld_tx_data_wr *req;
+ unsigned int wr_ulp_mode_force;
+ struct chtls_sock *csk;
+ unsigned int opcode;
+
+ csk = rcu_dereference_sk_user_data(sk);
+ opcode = FW_OFLD_TX_DATA_WR;
+
+ req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
+ req->op_to_immdlen = htonl(WR_OP_V(opcode) |
+ FW_WR_COMPL_V(compl) |
+ FW_WR_IMMDLEN_V(immdlen));
+ req->flowid_len16 = htonl(FW_WR_FLOWID_V(csk->tid) |
+ FW_WR_LEN16_V(credits));
+
+ wr_ulp_mode_force = TX_ULP_MODE_V(csk->ulp_mode);
+ if (is_sg_request(skb))
+ wr_ulp_mode_force |= FW_OFLD_TX_DATA_WR_ALIGNPLD_F |
+ ((tcp_sk(sk)->nonagle & TCP_NAGLE_OFF) ? 0 :
+ FW_OFLD_TX_DATA_WR_SHOVE_F);
+
+ req->tunnel_to_proxy = htonl(wr_ulp_mode_force |
+ FW_OFLD_TX_DATA_WR_URGENT_V(skb_urgent(skb)) |
+ FW_OFLD_TX_DATA_WR_SHOVE_V((!csk_flag
+ (sk, CSK_TX_MORE_DATA)) &&
+ skb_queue_empty(&csk->txq)));
+ req->plen = htonl(len);
+}
+
+static int chtls_wr_size(struct chtls_sock *csk, const struct sk_buff *skb,
+ bool size)
+{
+ int wr_size;
+
+ wr_size = TLS_WR_CPL_LEN;
+ wr_size += KEY_ON_MEM_SZ;
+ wr_size += ivs_size(csk->sk, skb);
+
+ if (size)
+ return wr_size;
+
+ /* frags counted for IV dsgl */
+ if (!skb_ulp_tls_iv_imm(skb))
+ skb_shinfo(skb)->nr_frags++;
+
+ return wr_size;
+}
+
+static bool is_ofld_imm(struct chtls_sock *csk, const struct sk_buff *skb)
+{
+ int length = skb->len;
+
+ if (skb->peeked || skb->len > MAX_IMM_ULPTX_WR_LEN)
+ return false;
+
+ if (likely(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NEED_HDR)) {
+ /* Check TLS header len for Immediate */
+ if (csk->ulp_mode == ULP_MODE_TLS &&
+ skb_ulp_tls_inline(skb))
+ length += chtls_wr_size(csk, skb, true);
+ else
+ length += sizeof(struct fw_ofld_tx_data_wr);
+
+ return length <= MAX_IMM_OFLD_TX_DATA_WR_LEN;
+ }
+ return true;
+}
+
+static unsigned int calc_tx_flits(const struct sk_buff *skb,
+ unsigned int immdlen)
+{
+ unsigned int flits, cnt;
+
+ flits = immdlen / 8; /* headers */
+ cnt = skb_shinfo(skb)->nr_frags;
+ if (skb_tail_pointer(skb) != skb_transport_header(skb))
+ cnt++;
+ return flits + sgl_len(cnt);
+}
+
+static void arp_failure_discard(void *handle, struct sk_buff *skb)
+{
+ kfree_skb(skb);
+}
+
+int chtls_push_frames(struct chtls_sock *csk, int comp)
+{
+ struct chtls_hws *hws = &csk->tlshws;
+ struct tcp_sock *tp;
+ struct sk_buff *skb;
+ int total_size = 0;
+ struct sock *sk;
+ int wr_size;
+
+ wr_size = sizeof(struct fw_ofld_tx_data_wr);
+ sk = csk->sk;
+ tp = tcp_sk(sk);
+
+ if (unlikely(sk_in_state(sk, TCPF_SYN_SENT | TCPF_CLOSE)))
+ return 0;
+
+ if (unlikely(csk_flag(sk, CSK_ABORT_SHUTDOWN)))
+ return 0;
+
+ while (csk->wr_credits && (skb = skb_peek(&csk->txq)) &&
+ (!(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_HOLD) ||
+ skb_queue_len(&csk->txq) > 1)) {
+ unsigned int credit_len = skb->len;
+ unsigned int credits_needed;
+ unsigned int completion = 0;
+ int tls_len = skb->len;/* TLS data len before IV/key */
+ unsigned int immdlen;
+ int len = skb->len; /* length [ulp bytes] inserted by hw */
+ int flowclen16 = 0;
+ int tls_tx_imm = 0;
+
+ immdlen = skb->len;
+ if (!is_ofld_imm(csk, skb)) {
+ immdlen = skb_transport_offset(skb);
+ if (skb_ulp_tls_inline(skb))
+ wr_size = chtls_wr_size(csk, skb, false);
+ credit_len = 8 * calc_tx_flits(skb, immdlen);
+ } else {
+ if (skb_ulp_tls_inline(skb)) {
+ wr_size = chtls_wr_size(csk, skb, false);
+ tls_tx_imm = 1;
+ }
+ }
+ if (likely(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NEED_HDR))
+ credit_len += wr_size;
+ credits_needed = DIV_ROUND_UP(credit_len, 16);
+ if (!csk_flag_nochk(csk, CSK_TX_DATA_SENT)) {
+ flowclen16 = send_tx_flowc_wr(sk, 1, tp->snd_nxt,
+ tp->rcv_nxt);
+ if (flowclen16 <= 0)
+ break;
+ csk->wr_credits -= flowclen16;
+ csk->wr_unacked += flowclen16;
+ csk->wr_nondata += flowclen16;
+ csk_set_flag(csk, CSK_TX_DATA_SENT);
+ }
+
+ if (csk->wr_credits < credits_needed) {
+ if (skb_ulp_tls_inline(skb) &&
+ !skb_ulp_tls_iv_imm(skb))
+ skb_shinfo(skb)->nr_frags--;
+ break;
+ }
+
+ __skb_unlink(skb, &csk->txq);
+ skb_set_queue_mapping(skb, (csk->txq_idx << 1) |
+ CPL_PRIORITY_DATA);
+ if (hws->ofld)
+ hws->txqid = (skb->queue_mapping >> 1);
+ skb->csum = (__force __wsum)(credits_needed + csk->wr_nondata);
+ csk->wr_credits -= credits_needed;
+ csk->wr_unacked += credits_needed;
+ csk->wr_nondata = 0;
+ enqueue_wr(csk, skb);
+
+ if (likely(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NEED_HDR)) {
+ if ((comp && csk->wr_unacked == credits_needed) ||
+ (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_COMPL) ||
+ csk->wr_unacked >= csk->wr_max_credits / 2) {
+ completion = 1;
+ csk->wr_unacked = 0;
+ }
+ if (skb_ulp_tls_inline(skb))
+ make_tlstx_data_wr(sk, skb, tls_tx_imm,
+ tls_len, credits_needed);
+ else
+ make_tx_data_wr(sk, skb, immdlen, len,
+ credits_needed, completion);
+ tp->snd_nxt += len;
+ tp->lsndtime = tcp_time_stamp(tp);
+ if (completion)
+ ULP_SKB_CB(skb)->flags &= ~ULPCB_FLAG_NEED_HDR;
+ } else {
+ struct cpl_close_con_req *req = cplhdr(skb);
+ unsigned int cmd = CPL_OPCODE_G(ntohl
+ (OPCODE_TID(req)));
+
+ if (cmd == CPL_CLOSE_CON_REQ)
+ csk_set_flag(csk,
+ CSK_CLOSE_CON_REQUESTED);
+
+ if ((ULP_SKB_CB(skb)->flags & ULPCB_FLAG_COMPL) &&
+ (csk->wr_unacked >= csk->wr_max_credits / 2)) {
+ req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
+ csk->wr_unacked = 0;
+ }
+ }
+ total_size += skb->truesize;
+ if (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_BARRIER)
+ csk_set_flag(csk, CSK_TX_WAIT_IDLE);
+ t4_set_arp_err_handler(skb, NULL, arp_failure_discard);
+ cxgb4_l2t_send(csk->egress_dev, skb, csk->l2t_entry);
+ }
+ sk->sk_wmem_queued -= total_size;
+ return total_size;
+}
+
+static void mark_urg(struct tcp_sock *tp, int flags,
+ struct sk_buff *skb)
+{
+ if (unlikely(flags & MSG_OOB)) {
+ tp->snd_up = tp->write_seq;
+ ULP_SKB_CB(skb)->flags = ULPCB_FLAG_URG |
+ ULPCB_FLAG_BARRIER |
+ ULPCB_FLAG_NO_APPEND |
+ ULPCB_FLAG_NEED_HDR;
+ }
+}
+
+/*
+ * Returns true if a connection should send more data to TCP engine
+ */
+static bool should_push(struct sock *sk)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct chtls_dev *cdev = csk->cdev;
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ /*
+ * If we've released our offload resources there's nothing to do ...
+ */
+ if (!cdev)
+ return false;
+
+ /*
+ * If there aren't any work requests in flight, or there isn't enough
+ * data in flight, or Nagle is off then send the current TX_DATA
+ * otherwise hold it and wait to accumulate more data.
+ */
+ return csk->wr_credits == csk->wr_max_credits ||
+ (tp->nonagle & TCP_NAGLE_OFF);
+}
+
+/*
+ * Returns true if a TCP socket is corked.
+ */
+static bool corked(const struct tcp_sock *tp, int flags)
+{
+ return (flags & MSG_MORE) || (tp->nonagle & TCP_NAGLE_CORK);
+}
+
+/*
+ * Returns true if a send should try to push new data.
+ */
+static bool send_should_push(struct sock *sk, int flags)
+{
+ return should_push(sk) && !corked(tcp_sk(sk), flags);
+}
+
+void chtls_tcp_push(struct sock *sk, int flags)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ int qlen = skb_queue_len(&csk->txq);
+
+ if (likely(qlen)) {
+ struct sk_buff *skb = skb_peek_tail(&csk->txq);
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ mark_urg(tp, flags, skb);
+
+ if (!(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) &&
+ corked(tp, flags)) {
+ ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_HOLD;
+ return;
+ }
+
+ ULP_SKB_CB(skb)->flags &= ~ULPCB_FLAG_HOLD;
+ if (qlen == 1 &&
+ ((ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) ||
+ should_push(sk)))
+ chtls_push_frames(csk, 1);
+ }
+}
+
+/*
+ * Calculate the size for a new send sk_buff. It's maximum size so we can
+ * pack lots of data into it, unless we plan to send it immediately, in which
+ * case we size it more tightly.
+ *
+ * Note: we don't bother compensating for MSS < PAGE_SIZE because it doesn't
+ * arise in normal cases and when it does we are just wasting memory.
+ */
+static int select_size(struct sock *sk, int io_len, int flags, int len)
+{
+ const int pgbreak = SKB_MAX_HEAD(len);
+
+ /*
+ * If the data wouldn't fit in the main body anyway, put only the
+ * header in the main body so it can use immediate data and place all
+ * the payload in page fragments.
+ */
+ if (io_len > pgbreak)
+ return 0;
+
+ /*
+ * If we will be accumulating payload get a large main body.
+ */
+ if (!send_should_push(sk, flags))
+ return pgbreak;
+
+ return io_len;
+}
+
+void skb_entail(struct sock *sk, struct sk_buff *skb, int flags)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ ULP_SKB_CB(skb)->seq = tp->write_seq;
+ ULP_SKB_CB(skb)->flags = flags;
+ __skb_queue_tail(&csk->txq, skb);
+ sk->sk_wmem_queued += skb->truesize;
+
+ if (TCP_PAGE(sk) && TCP_OFF(sk)) {
+ put_page(TCP_PAGE(sk));
+ TCP_PAGE(sk) = NULL;
+ TCP_OFF(sk) = 0;
+ }
+}
+
+static struct sk_buff *get_tx_skb(struct sock *sk, int size)
+{
+ struct sk_buff *skb;
+
+ skb = alloc_skb(size + TX_HEADER_LEN, sk->sk_allocation);
+ if (likely(skb)) {
+ skb_reserve(skb, TX_HEADER_LEN);
+ skb_entail(sk, skb, ULPCB_FLAG_NEED_HDR);
+ skb_reset_transport_header(skb);
+ }
+ return skb;
+}
+
+static struct sk_buff *get_record_skb(struct sock *sk, int size, bool zcopy)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct sk_buff *skb;
+
+ skb = alloc_skb(((zcopy ? 0 : size) + TX_TLSHDR_LEN +
+ KEY_ON_MEM_SZ + max_ivs_size(sk, size)),
+ sk->sk_allocation);
+ if (likely(skb)) {
+ skb_reserve(skb, (TX_TLSHDR_LEN +
+ KEY_ON_MEM_SZ + max_ivs_size(sk, size)));
+ skb_entail(sk, skb, ULPCB_FLAG_NEED_HDR);
+ skb_reset_transport_header(skb);
+ ULP_SKB_CB(skb)->ulp.tls.ofld = 1;
+ ULP_SKB_CB(skb)->ulp.tls.type = csk->tlshws.type;
+ }
+ return skb;
+}
+
+static void tx_skb_finalize(struct sk_buff *skb)
+{
+ struct ulp_skb_cb *cb = ULP_SKB_CB(skb);
+
+ if (!(cb->flags & ULPCB_FLAG_NO_HDR))
+ cb->flags = ULPCB_FLAG_NEED_HDR;
+ cb->flags |= ULPCB_FLAG_NO_APPEND;
+}
+
+static void push_frames_if_head(struct sock *sk)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+
+ if (skb_queue_len(&csk->txq) == 1)
+ chtls_push_frames(csk, 1);
+}
+
+static int chtls_skb_copy_to_page_nocache(struct sock *sk,
+ struct iov_iter *from,
+ struct sk_buff *skb,
+ struct page *page,
+ int off, int copy)
+{
+ int err;
+
+ err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) +
+ off, copy, skb->len);
+ if (err)
+ return err;
+
+ skb->len += copy;
+ skb->data_len += copy;
+ skb->truesize += copy;
+ sk->sk_wmem_queued += copy;
+ return 0;
+}
+
+/* Read TLS header to find content type and data length */
+static u16 tls_header_read(struct tls_hdr *thdr, struct iov_iter *from)
+{
+ if (copy_from_iter(thdr, sizeof(*thdr), from) != sizeof(*thdr))
+ return -EFAULT;
+ return (__force u16)cpu_to_be16(thdr->length);
+}
+
+int chtls_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct chtls_dev *cdev = csk->cdev;
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct sk_buff *skb;
+ int mss, flags, err;
+ int recordsz = 0;
+ int copied = 0;
+ int hdrlen = 0;
+ long timeo;
+
+ lock_sock(sk);
+ flags = msg->msg_flags;
+ timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+
+ if (!sk_in_state(sk, TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) {
+ err = sk_stream_wait_connect(sk, &timeo);
+ if (err)
+ goto out_err;
+ }
+
+ if (sk->sk_prot->sendmsg != chtls_sendmsg) {
+ release_sock(sk);
+ if (sk->sk_prot->sendmsg)
+ return sk->sk_prot->sendmsg(sk, msg, size);
+ else
+ return sk->sk_socket->ops->sendmsg(sk->sk_socket,
+ msg, size);
+ }
+
+ sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
+ err = -EPIPE;
+ if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
+ goto out_err;
+
+ mss = csk->mss;
+ csk_set_flag(csk, CSK_TX_MORE_DATA);
+
+ while (msg_data_left(msg)) {
+ int copy = 0;
+
+ skb = skb_peek_tail(&csk->txq);
+ if (skb) {
+ copy = mss - skb->len;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ if (is_tls_tx(csk) && !csk->tlshws.txleft) {
+ struct tls_hdr hdr;
+
+ recordsz = tls_header_read(&hdr, &msg->msg_iter);
+ size -= TLS_HEADER_LENGTH;
+ hdrlen += TLS_HEADER_LENGTH;
+ csk->tlshws.txleft = recordsz;
+ csk->tlshws.type = hdr.type;
+ if (skb)
+ ULP_SKB_CB(skb)->ulp.tls.type = hdr.type;
+ }
+
+ if (!skb || (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) ||
+ copy <= 0) {
+new_buf:
+ if (skb) {
+ tx_skb_finalize(skb);
+ push_frames_if_head(sk);
+ }
+
+ if (is_tls_tx(csk)) {
+ skb = get_record_skb(sk,
+ select_size(sk,
+ recordsz,
+ flags,
+ TX_TLSHDR_LEN),
+ false);
+ } else {
+ skb = get_tx_skb(sk,
+ select_size(sk, size, flags,
+ TX_HEADER_LEN));
+ }
+ if (unlikely(!skb))
+ goto wait_for_memory;
+
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ copy = mss;
+ }
+ if (copy > size)
+ copy = size;
+
+ if (skb_tailroom(skb) > 0) {
+ copy = min(copy, skb_tailroom(skb));
+ if (is_tls_tx(csk))
+ copy = min_t(int, copy, csk->tlshws.txleft);
+ err = skb_add_data_nocache(sk, skb,
+ &msg->msg_iter, copy);
+ if (err)
+ goto do_fault;
+ } else {
+ int i = skb_shinfo(skb)->nr_frags;
+ struct page *page = TCP_PAGE(sk);
+ int pg_size = PAGE_SIZE;
+ int off = TCP_OFF(sk);
+ bool merge;
+
+ if (page)
+ pg_size <<= compound_order(page);
+
+ if (off < pg_size &&
+ skb_can_coalesce(skb, i, page, off)) {
+ merge = 1;
+ goto copy;
+ }
+ merge = 0;
+ if (i == (is_tls_tx(csk) ? (MAX_SKB_FRAGS - 1) :
+ MAX_SKB_FRAGS))
+ goto new_buf;
+
+ if (page && off == pg_size) {
+ put_page(page);
+ TCP_PAGE(sk) = page = NULL;
+ pg_size = PAGE_SIZE;
+ }
+
+ if (!page) {
+ gfp_t gfp = sk->sk_allocation;
+ int order = cdev->send_page_order;
+
+ if (order) {
+ page = alloc_pages(gfp | __GFP_COMP |
+ __GFP_NOWARN |
+ __GFP_NORETRY,
+ order);
+ if (page)
+ pg_size <<=
+ compound_order(page);
+ }
+ if (!page) {
+ page = alloc_page(gfp);
+ pg_size = PAGE_SIZE;
+ }
+ if (!page)
+ goto wait_for_memory;
+ off = 0;
+ }
+copy:
+ if (copy > pg_size - off)
+ copy = pg_size - off;
+ if (is_tls_tx(csk))
+ copy = min_t(int, copy, csk->tlshws.txleft);
+
+ err = chtls_skb_copy_to_page_nocache(sk, &msg->msg_iter,
+ skb, page,
+ off, copy);
+ if (unlikely(err)) {
+ if (!TCP_PAGE(sk)) {
+ TCP_PAGE(sk) = page;
+ TCP_OFF(sk) = 0;
+ }
+ goto do_fault;
+ }
+ /* Update the skb. */
+ if (merge) {
+ skb_shinfo(skb)->frags[i - 1].size += copy;
+ } else {
+ skb_fill_page_desc(skb, i, page, off, copy);
+ if (off + copy < pg_size) {
+ /* space left keep page */
+ get_page(page);
+ TCP_PAGE(sk) = page;
+ } else {
+ TCP_PAGE(sk) = NULL;
+ }
+ }
+ TCP_OFF(sk) = off + copy;
+ }
+ if (unlikely(skb->len == mss))
+ tx_skb_finalize(skb);
+ tp->write_seq += copy;
+ copied += copy;
+ size -= copy;
+
+ if (is_tls_tx(csk))
+ csk->tlshws.txleft -= copy;
+
+ if (corked(tp, flags) &&
+ (sk_stream_wspace(sk) < sk_stream_min_wspace(sk)))
+ ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_NO_APPEND;
+
+ if (size == 0)
+ goto out;
+
+ if (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND)
+ push_frames_if_head(sk);
+ continue;
+wait_for_memory:
+ err = sk_stream_wait_memory(sk, &timeo);
+ if (err)
+ goto do_error;
+ }
+out:
+ csk_reset_flag(csk, CSK_TX_MORE_DATA);
+ if (copied)
+ chtls_tcp_push(sk, flags);
+done:
+ release_sock(sk);
+ return copied + hdrlen;
+do_fault:
+ if (!skb->len) {
+ __skb_unlink(skb, &csk->txq);
+ sk->sk_wmem_queued -= skb->truesize;
+ __kfree_skb(skb);
+ }
+do_error:
+ if (copied)
+ goto out;
+out_err:
+ if (csk_conn_inline(csk))
+ csk_reset_flag(csk, CSK_TX_MORE_DATA);
+ copied = sk_stream_error(sk, flags, err);
+ goto done;
+}
+
+int chtls_sendpage(struct sock *sk, struct page *page,
+ int offset, size_t size, int flags)
+{
+ struct chtls_sock *csk;
+ int mss, err, copied;
+ struct tcp_sock *tp;
+ long timeo;
+
+ tp = tcp_sk(sk);
+ copied = 0;
+
+ if (sk->sk_prot->sendpage != chtls_sendpage) {
+ release_sock(sk);
+ if (sk->sk_prot->sendpage)
+ return sk->sk_prot->sendpage(sk, page, offset,
+ size, flags);
+ else
+ return sk->sk_socket->ops->sendpage(sk->sk_socket,
+ page, offset,
+ size, flags);
+ }
+
+ csk = rcu_dereference_sk_user_data(sk);
+ timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+
+ err = sk_stream_wait_connect(sk, &timeo);
+ if (!sk_in_state(sk, TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) &&
+ err != 0)
+ goto out_err;
+
+ mss = csk->mss;
+ csk_set_flag(csk, CSK_TX_MORE_DATA);
+
+ while (size > 0) {
+ struct sk_buff *skb = skb_peek_tail(&csk->txq);
+ int copy, i;
+
+ copy = mss - skb->len;
+ if (!skb || (ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND) ||
+ copy <= 0) {
+new_buf:
+
+ if (is_tls_tx(csk)) {
+ skb = get_record_skb(sk,
+ select_size(sk, size,
+ flags,
+ TX_TLSHDR_LEN),
+ true);
+ } else {
+ skb = get_tx_skb(sk, 0);
+ }
+ if (!skb)
+ goto do_error;
+ copy = mss;
+ }
+ if (copy > size)
+ copy = size;
+
+ i = skb_shinfo(skb)->nr_frags;
+ if (skb_can_coalesce(skb, i, page, offset)) {
+ skb_shinfo(skb)->frags[i - 1].size += copy;
+ } else if (i < MAX_SKB_FRAGS) {
+ get_page(page);
+ skb_fill_page_desc(skb, i, page, offset, copy);
+ } else {
+ tx_skb_finalize(skb);
+ push_frames_if_head(sk);
+ goto new_buf;
+ }
+
+ skb->len += copy;
+ if (skb->len == mss)
+ tx_skb_finalize(skb);
+ skb->data_len += copy;
+ skb->truesize += copy;
+ sk->sk_wmem_queued += copy;
+ tp->write_seq += copy;
+ copied += copy;
+ offset += copy;
+ size -= copy;
+
+ if (corked(tp, flags) &&
+ (sk_stream_wspace(sk) < sk_stream_min_wspace(sk)))
+ ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_NO_APPEND;
+
+ if (!size)
+ break;
+
+ if (unlikely(ULP_SKB_CB(skb)->flags & ULPCB_FLAG_NO_APPEND))
+ push_frames_if_head(sk);
+ continue;
+
+ set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+ }
+out:
+ csk_reset_flag(csk, CSK_TX_MORE_DATA);
+ if (copied)
+ chtls_tcp_push(sk, flags);
+done:
+ release_sock(sk);
+ return copied;
+
+do_error:
+ if (copied)
+ goto out;
+
+out_err:
+ if (csk_conn_inline(csk))
+ csk_reset_flag(csk, CSK_TX_MORE_DATA);
+ copied = sk_stream_error(sk, flags, err);
+ goto done;
+}
--
1.8.3.1
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