forked from luck/tmp_suning_uos_patched
[SCSI] iscsi: preemt fix and cleanup
From: zhenyu.z.wang@intel.com Delay the head digest update until xmit time, like data digest update. [To make things cleaner and avoid prempt bug] Signed-off-by: Alex Aizman <itn780@yahoo.com> Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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@ -129,14 +129,11 @@ iscsi_buf_left(struct iscsi_buf *ibuf)
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}
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static inline void
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iscsi_buf_init_hdr(struct iscsi_conn *conn, struct iscsi_buf *ibuf,
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char *vbuf, u8 *crc)
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iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
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u8* crc)
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{
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iscsi_buf_init_virt(ibuf, vbuf, sizeof(struct iscsi_hdr));
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if (conn->hdrdgst_en) {
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crypto_digest_digest(conn->tx_tfm, &ibuf->sg, 1, crc);
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ibuf->sg.length += sizeof(uint32_t);
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}
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crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
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buf->sg.length += sizeof(uint32_t);
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}
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static void
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@ -427,8 +424,8 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
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r2t->sent = 0;
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iscsi_buf_init_hdr(conn, &r2t->headbuf, (char*)hdr,
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(u8 *)dtask->hdrext);
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iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
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sizeof(struct iscsi_hdr));
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r2t->dtask = dtask;
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@ -1494,8 +1491,8 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
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}
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conn->dataout_pdus_cnt++;
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iscsi_buf_init_hdr(conn, &r2t->headbuf, (char*)hdr,
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(u8 *)dtask->hdrext);
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iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
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sizeof(struct iscsi_hdr));
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r2t->dtask = dtask;
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@ -1541,8 +1538,8 @@ iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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hdr->flags = ISCSI_FLAG_CMD_FINAL;
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}
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iscsi_buf_init_hdr(conn, &ctask->headbuf, (char*)hdr,
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(u8 *)dtask->hdrext);
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iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
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sizeof(struct iscsi_hdr));
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list_add(&dtask->item, &ctask->dataqueue);
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@ -1662,8 +1659,8 @@ iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
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zero_data(ctask->hdr.dlength);
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}
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iscsi_buf_init_hdr(conn, &ctask->headbuf, (char*)&ctask->hdr,
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(u8 *)ctask->hdrext);
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iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
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sizeof(struct iscsi_hdr));
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conn->scsicmd_pdus_cnt++;
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}
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@ -1692,6 +1689,11 @@ iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
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mtask->xmstate &= ~XMSTATE_IMM_HDR;
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if (mtask->data_count)
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mtask->xmstate |= XMSTATE_IMM_DATA;
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if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
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conn->stop_stage != STOP_CONN_RECOVER &&
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conn->hdrdgst_en)
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iscsi_hdr_digest(conn, &mtask->headbuf,
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(u8*)mtask->hdrext);
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if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
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mtask->xmstate |= XMSTATE_IMM_HDR;
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if (mtask->data_count)
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@ -1723,6 +1725,8 @@ static inline int
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handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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ctask->xmstate &= ~XMSTATE_R_HDR;
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if (conn->hdrdgst_en)
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iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
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if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
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BUG_ON(ctask->xmstate != XMSTATE_IDLE);
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return 0; /* wait for Data-In */
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@ -1735,6 +1739,8 @@ static inline int
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handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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{
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ctask->xmstate &= ~XMSTATE_W_HDR;
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if (conn->hdrdgst_en)
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iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
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if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
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ctask->xmstate |= XMSTATE_W_HDR;
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return -EAGAIN;
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@ -1813,7 +1819,9 @@ handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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iscsi_unsolicit_data_init(conn, ctask);
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BUG_ON(!ctask->dtask);
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dtask = ctask->dtask;
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if (conn->hdrdgst_en)
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iscsi_hdr_digest(conn, &ctask->headbuf,
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(u8*)dtask->hdrext);
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ctask->xmstate &= ~XMSTATE_UNS_INIT;
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}
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if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
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@ -2118,7 +2126,9 @@ iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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sizeof(void*));
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solicit_head_again:
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r2t = ctask->r2t;
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if (conn->hdrdgst_en)
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iscsi_hdr_digest(conn, &r2t->headbuf,
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(u8*)r2t->dtask->hdrext);
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if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
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ctask->xmstate &= ~XMSTATE_SOL_DATA;
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ctask->xmstate |= XMSTATE_SOL_HDR;
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@ -2889,14 +2899,8 @@ iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
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memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
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if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE ||
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conn->stop_stage == STOP_CONN_RECOVER)
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iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
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iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
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sizeof(struct iscsi_hdr));
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else
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/* this will update header digest */
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iscsi_buf_init_hdr(conn, &mtask->headbuf, (char*)&mtask->hdr,
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(u8 *)mtask->hdrext);
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spin_unlock_bh(&session->lock);
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